Designation: B366/B366M − 15

Standard Specification for

Factory-Made Wrought Nickel and Nickel Alloy Fittings1
This standard is issued under the fixed designation B366/B366M; the number immediately following the designation indicates the year
of original adoption or, in the case of revision, the year of last revision. A number in parentheses indicates the year of last reapproval.
A superscript epsilon (´) indicates an editorial change since the last revision or reapproval.

1. Scope* 1.5 This standard does not purport to address all of the
1.1 This specification covers wrought welding fittings for safety concerns, if any, associated with its use. It is the
pressure piping, factory-made from nickel and nickel alloys. responsibility of the user of this standard to become familiar
Threaded fittings as covered in ASME B16.11 are also covered with all hazards including those identified in the appropriate
by this specification. The term welding applies to butt-welding Safety Data Sheet (SDS) for this product/material as provided
or socket-welding parts such as 45 and 90° elbows, 180° bends, by the manufacturer, to establish appropriate safety and health
caps, tees, reducers, lap-joint stub ends, and other types, as practices, and determine the applicability of regulatory limi-
covered by ASME B16.9, ASME B16.11, MSS SP-43, MSS tations prior to use.
SP-95, and MSS SP-97. 2. Referenced Documents
1.1.1 Several grades of nickel and nickel alloys are included
in this specification. Grades are designated with a prefix, WP or 2.1 ASTM Standards:2
CR, based on the applicable ASME or MSS dimensional and B127 Specification for Nickel-Copper Alloy (UNS N04400)
rating standards. Plate, Sheet, and Strip
1.1.2 Class WP fittings are those manufactured to the B160 Specification for Nickel Rod and Bar
requirements of ASME B16.9, B16.11. B161 Specification for Nickel Seamless Pipe and Tube
1.1.3 For each of the WP nickel and nickel alloy grades, B162 Specification for Nickel Plate, Sheet, and Strip
several classes of fittings are covered to indicate whether B163 Specification for Seamless Nickel and Nickel Alloy
seamless or welded construction was utilized. Class designa- Condenser and Heat-Exchanger Tubes
tions are also utilized to indicate the nondestructive test method B164 Specification for Nickel-Copper Alloy Rod, Bar, and
and extent of nondestructive examination (NDE). Table 1 is Wire
general summary of the fitting classes applicable to all WP B165 Specification for Nickel-Copper Alloy (UNS N04400)
grades of nickel and nickel alloys covered by this specification. Seamless Pipe and Tube
There are no classes for the CR grades. Specific requirements B166 Specification for Nickel-Chromium-Iron Alloys (UNS
are covered elsewhere. N06600, N06601, N06603, N06690, N06693, N06025,
N06045, and N06696), Nickel-Chromium-Cobalt-
1.2 This specification does not apply to cast welding fit- Molybdenum Alloy (UNS N06617), and Nickel-Iron-
tings. Chromium-Tungsten Alloy (UNS N06674) Rod, Bar, and
1.3 Optional supplementary requirements are provided for Wire
fittings where a greater degree of examination is desired. These B167 Specification for Nickel-Chromium-Iron Alloys (UNS
supplementary requirements call for additional tests. When N06600, N06601, N06603, N06690, N06693, N06025,
desired, one or more of these may be specified in the order. N06045, and N06696), Nickel-Chromium-Cobalt-
Molybdenum Alloy (UNS N06617), and Nickel-Iron-
1.4 The values stated in either SI units or inch-pound units
Chromium-Tungsten Alloy (UNS N06674) Seamless Pipe
are to be regarded separately as standard. The values stated in
and Tube
each system may not be exact equivalents; therefore, each
B168 Specification for Nickel-Chromium-Iron Alloys (UNS
system shall be used independently of the other. Combining
N06600, N06601, N06603, N06690, N06693, N06025,
values from the two systems may result in non-conformance
N06045, and N06696), Nickel-Chromium-Cobalt-
with the standard.
Molybdenum Alloy (UNS N06617), and Nickel-Iron-
Chromium-Tungsten Alloy (UNS N06674) Plate, Sheet,
1
and Strip
This specification is under the jurisdiction of ASTM Committee B02 on
Nonferrous Metals and Alloys and is the direct responsibility of Subcommittee
2
B02.07 on Refined Nickel and Cobalt and Their Alloys. For referenced ASTM standards, visit the ASTM website, www.astm.org, or
Current edition approved Oct. 1, 2015. Published November 2015. Originally contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
approved in 1961. Last previous edition approved in 2010 as B366 – 10a. DOI: Standards volume information, refer to the standard’s Document Summary page on
10.1520/B0366_B366M-15. the ASTM website.

*A Summary of Changes section appears at the end of this standard

Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States

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 B366/B366M − 15
TABLE 1 Fitting Classes for WP Grades B473 Specification for UNS N08020, UNS N08024, and
Class Construction Nondestructive Examination UNS N08026 Nickel Alloy Bar and Wire
S Seamless None B511 Specification for Nickel-Iron-Chromium-Silicon Alloy
W Welded Radiography or Ultrasonic Bars and Shapes
WX Welded Radiography
WU Welded Ultrasonic B512 Specification for Nickel-Chromium-Silicon Alloy
(UNS N08330) Billets and Bars
B514 Specification for Welded Nickel-Iron-Chromium Alloy
Pipe
B515 Specification for Welded UNS N08120, UNS N08800,
B333 Specification for Nickel-Molybdenum Alloy Plate, UNS N08810, and UNS N08811 Alloy Tubes
Sheet, and Strip B516 Specification for Welded Nickel-Chromium-Iron Alloy
B335 Specification for Nickel-Molybdenum Alloy Rod (UNS N06600, UNS N06601, UNS N06603, UNS
B407 Specification for Nickel-Iron-Chromium Alloy Seam- N06025, UNS N06045, UNS N06690, and UNS N06693)
less Pipe and Tube Tubes
B408 Specification for Nickel-Iron-Chromium Alloy Rod B517 Specification for Welded Nickel-Chromium-Iron-
and Bar Alloy (UNS N06600, UNS N06603, UNS N06025, and
B409 Specification for Nickel-Iron-Chromium Alloy Plate, UNS N06045) Pipe
Sheet, and Strip
B535 Specification for Nickel-Iron-Chromium-Silicon Al-
B423 Specification for Nickel-Iron-Chromium-
loys (UNS N08330 and N08332) Seamless Pipe and Tube
Molybdenum-Copper Alloy (UNS N08825, N08221, and
B536 Specification for Nickel-Iron-Chromium-Silicon Al-
N06845) Seamless Pipe and Tube
loys (UNS N08330 and N08332) Plate, Sheet, and Strip
B424 Specification for Ni-Fe-Cr-Mo-Cu Alloy (UNS
B564 Specification for Nickel Alloy Forgings
N08825, UNS N08221, and UNS N06845) Plate, Sheet,
B572 Specification for UNS N06002, UNS N06230, UNS
and Strip
N12160, and UNS R30556 Rod
B425 Specification for Ni-Fe-Cr-Mo-Cu Alloy (UNS
N08825, UNS N08221, and UNS N06845) Rod and Bar B573 Specification for Nickel-Molybdenum-Chromium-
B434 Specification for Nickel-Molybdenum-Chromium- Iron Alloys (UNS N10003, N10242) Rod
Iron Alloys (UNS N10003, UNS N10242) Plate, Sheet, B574 Specification for Low-Carbon Nickel-Chromium-
and Strip Molybdenum, Low-Carbon Nickel-Molybdenum-
B435 Specification for UNS N06002, UNS N06230, UNS Chromium, Low-Carbon Nickel-Molybdenum-
N12160, and UNS R30556 Plate, Sheet, and Strip Chromium-Tantalum, Low-Carbon Nickel-Chromium-
B443 Specification for Nickel-Chromium-Molybdenum- Molybdenum-Copper, and Low-Carbon Nickel-
Columbium Alloy(UNS N06625) and Nickel-Chromium- Chromium-Molybdenum-Tungsten Alloy Rod
Molybdenum-SiliconAlloy (UNS N06219) Plate, Sheet, B575 Specification for Low-Carbon Nickel-Chromium-
and Strip Molybdenum, Low-Carbon Nickel-Chromium-
B444 Specification for Nickel-Chromium-Molybdenum- Molybdenum-Copper, Low-Carbon Nickel-Chromium-
Columbium Alloys (UNS N06625 and UNS N06852) and Molybdenum-Tantalum, Low-Carbon Nickel-Chromium-
Nickel-Chromium-Molybdenum-Silicon Alloy (UNS Molybdenum-Tungsten, and Low-Carbon Nickel-
N06219) Pipe and Tube Molybdenum-Chromium Alloy Plate, Sheet, and Strip
B446 Specification for Nickel-Chromium-Molybdenum- B581 Specification for Nickel-Chromium-Iron-
Columbium Alloy (UNS N06625), Nickel-Chromium- Molybdenum-Copper Alloy Rod
Molybdenum-Silicon Alloy (UNS N06219), and Nickel- B582 Specification for Nickel-Chromium-Iron-
Chromium-Molybdenum-Tungsten Alloy (UNS N06650) Molybdenum-Copper Alloy Plate, Sheet, and Strip
Rod and Bar B619/B619M Specification for Welded Nickel and Nickel-
B462 Specification for Forged or Rolled UNS N06030, UNS Cobalt Alloy Pipe
N06022, UNS N06035, UNS N06200, UNS N06059, B622 Specification for Seamless Nickel and Nickel-Cobalt
UNS N10362, UNS N06686, UNS N08020, UNS Alloy Pipe and Tube
N08367, UNS N10276, UNS N10665, UNS N10675, B625 Specification for UNS N08925, UNS N08031, UNS
UNS N10629, UNS N08031, UNS N06045, UNS N08932, UNS N08926, UNS N08354, UNS N08830, and
N06025, and UNS R20033 Alloy Pipe Flanges, Forged UNS R20033 Plate, Sheet, and Strip
Fitting, and Values and Parts for Corrosive High- B626 Specification for Welded Nickel and Nickel-Cobalt
Temperature Service Alloy Tube
B463 Specification for UNS N08020 Alloy Plate, Sheet, and B649 Specification for Ni-Fe-Cr-Mo-Cu-N Low-Carbon Al-
Strip loys (UNS N08925, UNS N08031, UNS N08354, and
B464/B464M Specification for Welded UNS N08020 Alloy UNS N08926), and Cr-Ni-Fe-N Low-Carbon Alloy (UNS
Pipe R20033) Bar and Wire, and Ni-Cr-Fe-Mo-N Alloy (UNS
B468 Specification for Welded UNS N08020 Alloy Tubes N08936) Wire
B472 Specification for Nickel Alloy Billets and Bars for B673 Specification for UNS N08925, UNS N08354, and
Reforging UNS N08926 Welded Pipe

2
 B366/B366M − 15
B674 Specification for UNS N08925, UNS N08354, and 2.4 AWS Standards:5
UNS N08926 Welded Tube A5.11 Specification for Nickel and Nickel Alloy Covered
B675 Specification for UNS N08367 Welded Pipe Welding Electrodes
B676 Specification for UNS N08367 Welded Tube A5.14 Specification for Nickel and Nickel-Alloy Bare Weld-
B677 Specification for UNS N08925, UNS N08354, and ing Rods and Electrodes
UNS N08926 Seamless Pipe and Tube 2.5 ASNT:6
B688 Specification for Chromium-Nickel-Molybdenum- SNT-TC-1A Recommended Practice for Nondestructive
Iron (UNS N08366 and UNS N08367) Plate, Sheet, and Testing Personnel Qualification and Certification
Strip
B690 Specification for Iron-Nickel-Chromium- 3. Terminology
Molybdenum Alloys (UNS N08366 and UNS N08367) 3.1 Terms defined in Terminology B899 shall apply unless
Seamless Pipe and Tube otherwise defined in this standard.
B691 Specification for Iron-Nickel-Chromium-
Molybdenum Alloys (UNS N08366 and UNS N08367) 4. Ordering Information
Rod, Bar, and Wire
4.1 It is the responsibility of the purchaser to specify all
B704 Specification for Welded UNS N06625, UNS N06219
requirements that are necessary for material ordered under this
and UNS N08825 Alloy Tubes
specification. Examples of such requirements include, but are
B705 Specification for Nickel-Alloy (UNS N06625, N06219
not limited to, the following:
and N08825) Welded Pipe
4.1.1 Quantity, number of fittings of each kind,
B710 Specification for Nickel-Iron-Chromium-Silicon Alloy
4.1.2 Description of Fitting and Nominal Dimensions (stan-
Welded Pipe
dard or special),
B729 Specification for Seamless UNS N08020, UNS 4.1.3 Alloy Composition,
N08026, and UNS N08024 Nickel-Alloy Pipe and Tube 4.1.4 Condition (temper) if applicable.
B880 Specification for General Requirements for Chemical 4.1.5 If neither grade of N06625 is specified, Grade 1 will
Check Analysis Limits for Nickel, Nickel Alloys and be supplied.
Cobalt Alloys 4.1.6 For each Grade of WP fittings ordered, a Class should
B899 Terminology Relating to Non-ferrous Metals and Al- also be indicated.
loys 4.1.6.1 Grade CR fittings shall not be substituted for fittings
E165 Practice for Liquid Penetrant Examination for General ordered to Grade WP, but Grade WP may be substituted for
Industry Grade CR.
E1916 Guide for Identification of Mixed Lots of Metals 4.1.6.2 For all Classes of WP fittings, unless S, W, WX, or
2.2 ASME Standards: 3 WU is specified by the purchaser, any class may be furnished
B16.9 Wrought Steel Butt Welding Fittings at the option of the supplier.
B16.11 Forged Steel Fittings, Socket-Welding and Threaded 4.1.7 Purchaser Inspection—State which tests or inspec-
H34.1 Nickel Seamless Pipe and Tubing tions are to be witnessed (Section 10),
H34.2 Nickel-Copper Alloy Seamless Pipe and Tubing 4.1.8 Samples for Product (Check Analysis)—State whether
H34.3 Nickel-Chromium-Iron Alloy Seamless Pipe and Tub- samples should be furnished (6.3),
ing 4.1.9 Test reports (Section 12), and
4.1.10 Supplementary requirements, if any.
2.3 Manufacturers Standardization Society of the Valve and
Fittings Industry Standards:
5. Materials and Manufacture
MSS SP-25 Standard Marking Systems for Valves, Fittings,
Flanges, and Unions4 5.1 Material—The material for wrought welding fittings
MSS SP-43 Standard Practice for Light Weight Stainless may consist of forgings, rods, bars, plates, sheets, and seamless
Steel Butt Welding Fittings4 or welded pipe that conform to all the requirements of the
MSS SP-95 Sewage (D) Nipples and Bull Plugs4 ASTM specifications for the particular product and alloy
MSS SP-97 Forged Carbon Steel Branch Outlet Fit- referred to in Table 2.
tings–Socket Welding, Threaded and Butt Welding Ends4 5.2 Manufacture:
Boiler and Pressure Vessel Code, Section VIII, Division 5.2.1 Forging or shaping operations may be performed by
1 Pressure Vessels and Section IX, Welding Qualifica- hammering, pressing, piercing, extruding, upsetting, rolling,
tions3 bending, or fusion welding, or by a combination of two or more
of these operations. The forming procedure shall be so applied
that it will not produce injurious defects in the fittings.
3
Available from American Society of Mechanical Engineers (ASME), ASME
International Headquarters, Three Park Ave., New York, NY 10016-5990, http://
5
www.asme.org. Available from American Welding Society (AWS), 550 NW LeJeune Rd.,
4
Available from Manufacturers Standardization Society of the Valve and Fittings Miami, FL 33126, http://www.aws.org.
6
Industry (MSS), 127 Park St., NE, Vienna, VA 22180-4602, http://www.mss- Available from American Society for Nondestructive Testing (ASNT), P.O. Box
hq.com. 28518, 1711 Arlingate Ln., Columbus, OH 43228-0518, http://www.asnt.org.

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 B366/B366M − 15
TABLE 2 Permissible Raw Materials
A
Marking Product and ASTM DesignationB
Corrosion- Plate, Bar Forging
ASME Pressure UNS
Resistant Alloy Pipe or Tube Sheet, and Forging
Fittings Designation
Fittings or Strip Stock
CRN WPN Ni N02200 B161 B162 B160, B564
CRNL WPNL Ni, Low C N02201 B161 B162 B160
CRNCC WPNCC Ni-Cu N04400 B165 B127 B164, B564
CR HX WPHX Ni-Cr-Mo-Fe N06002 B619/B619M, B622, B626 B435 B572
CR HG WPHG Ni-Cr-Fe-Mo-Cu N06007 B619/B619M, B622, B626 B582 B581
CR HC 22 WPHC22 Low C-Ni-Mo-Cr N06022 B619/B619M, B622, B626 B575 B574, B564, B462,
B472
CRV602 WPV602 Ni-Cr-Fe N06025 B163, B167 B168 B166, B462, B472
CR HG 30 WPHG30 Ni-Cr-Fe-Mo-Cu N06030 B619/B619M, B622, B626 B582 B581, B462, B472
CRHG35 WPHG35 Ni-Cr-Mo N06035 B619/B619M, B622, B626 B575 B574, B564, B462,
B472
CRV45TM WPV45TM Ni-Cr-Fe N06045 B163, B167 B168 B166, B462, B472
CR2120 WP2120 Ni-Cr-Mo low C N06058 B619/B619M, B622, B626 B575 B564, B574
CR5923 WP5923 Low C-Ni-Cr-Mo N06059 B619/B619M, B622, B626 B575 B564, B574, B462,
B472
CR HC 2000 WPHC2000 Low C-Ni-Cr-Mo-Cu N06200 B619/B619M, B622, B626 B575 B564, B574, B462,
B472
CRM21 WPM21 Low C-Ni-Cr-Mo-Ta N06210 B619/B619M, B622, B626 B575 B564, B574
CRH230 WPH230 Ni-Cr-W-Mo N06230 B619/B619M, B622, B626 B435 B572, B564
CRHBC1 WPHBC1 Low C-Ni-Mo-Cr N10362 B619/B619M, B622. B626 B575 B574, B564, B462,
B472
CR HC 4 WPHC4 Low C-Ni-Mo-Cr N06455 B619/B619M, B622, B626 B575 B574
CRNCI WPNCI Ni-Cr-Fe N06600 B167, B516, B517 B168 B166, B564
CR603GT WP603GT Ni-Cr-Fe-Al N06603 B163, B167, B516, B517 B168 B166, B564
CRNCMC WPNCMC Ni-Cr-Mo-Cb N06625 B444, B704, B705 B443 B446, B564
CRIN686 WPIN686 Low C-Ni-Cr-Mo N06686 B163, B619/B619M, B622, B575 B564, B574, B462,
B626 B472
CR626Si WP626Si Ni-Cr-Mo-Si N06219 B444, B704, B705 B443 B446, B564
CR HG3 WPHG3 Ni-Cr-Fe-Mo-Cu N06985 B619/B619M, B622, B626 B582 B581
CR20CB WP20CB Cr-Ni-Fe-Mo-Cu-Cb N08020 B464/B464M, B468, B729 B463 B472, B473, B462
stabilized
CR3127 WP3127 Low C-Ni-Fe-Cr- N08031 B619/B619M, B622, B626 B625 B564, B649, B462,
Mo-Cu B472
CRH120 WPH120 Ni-Cr-Fe N08120 B407, B514, B515 B409 B408, B564
CR330 WP330 Ni-Fe-Cr-Si N08330 B535, B710 B536 B511, B512
CR6XN WP6XN Fe-Ni-Cr-Mo-N N08367 B675, B676, B690 B688 B472, B564, B691,
B462
CRNIC WPNIC Ni-Fe-Cr N08800 B407, B514, B515 B409 B408, B564
CRNIC10 WPNIC10 Ni-Fe-Cr N08810 B407, B514, B515 B409 B408, B564
CRNIC11 WPNIC11 Ni-Fe-Cr N08811 B407 B409 B408, B564
CRNICMC WPNICMC Ni-Fe-Cr-Mo-Cu N08825 B423, B704, B705 B424 B425, B564
CR1925 WP1925 Low C-Ni-Fe-Cr- N08925 B673, B674, B677 B625 B649
Mo-Cu
CR1925N WP1925N Low C-Ni-Fe-Cr-Mo- N08926 B673, B674, B677 B625 B649
Cu-N
CR HB WPHB Ni-Mo N10001 B619/B619M, B622, B626 B333 B335
CR HN WPHN Ni-Mo-Cr-Fe N10003 B434 B573
CR H242 WPH242 Ni-Mo-Cr-Fe N10242 B619/B619M, B622, B626 B434 B573, B564
CR HC 276 WPHC276 Low C-Ni-Mo-Cr N10276 B619/B619M, B622, B626 B575 B574, B564, B462,
B472
CRB10 WPB10 Low C-Ni-Mo-Cr-Fe N10624 B619/B619M, B622, B626 B333 B335, B564
CRVB4 WPVB4 Ni-Mo N10629 B619/B619M, B622, B626 B333 B335, B564, B462,
B472
CR HB2 WPHB-2 Ni-Mo N10665 B619/B619M, B622, B626 B333 B335, B564, B462,
B472
CR HB3 WPHB–3 Ni-Mo N10675 B619/B619M, B622, B626 B333 B335, B564, B462,
B472
CRH160 WPH160 Ni-Co-Cr-Si N12160 B619/B619M, B622, B626 B435 B564, B572
CR3033 WP3033 Low C-Cr-Ni-Fe-N R20033 B619/B619M, B622, B626 B625 B564, B649, B472,
B462
CRH556 WPH556 Ni-Fe-Cr-Co R30556 B619/B619M, B622, B626 B435 B572
A
When WP fittings are of welded construction or made from welded pipe, the symbol shall be supplemented with W or WX as applicable. If ultrasonic examination in
accordance with 5.2.4.2 or 5.2.5.1 is used, the symbol shall be supplemented by WU or WXU as applicable.
B
See 2.1 and 5.1.
C
Yield strength shall be 25 000 psi (172 MPa) min, for all hot-formed, annealed fittings made from WPNC material.

4
 B366/B366M − 15
5.2.2 Grade WP fittings ordered as Class S shall be of 5.2.10.1 The weld procedure and welders or welding opera-
seamless construction and shall meet all requirements of tors meet the requirements of 5.2.3.
ASME B16.9 or B16.11. 5.2.10.2 All weld surfaces are liquid penetrant examined in
5.2.3 All classes of fittings shall have the welders, welding accordance with Appendix 8 of Section VIII, Division 1 of the
operators, and welding procedures qualified under the provi- ASME Boiler and Pressure Vessel Code.
sions of Section IX of the ASME Boiler and Pressure Vessel 5.2.10.3 Repair of areas in the weld is permitted, but
Code. 5.2.10.1 and 5.2.10.2 must be repeated.
5.2.4 Grade WP fittings ordered as Class W shall meet the 5.2.10.4 Fittings shall be marked with the symbol WBU
requirements of ASME B16.9 and shall have all pipe welds following the alloy designation (for example: WPN-WBU).
made by the starting material manufacturer or the fitting 5.2.11 Stubends may be produced with the entire lap added
manufacturer with the addition of filler radiographically exam- as weld metal to a straight pipe section provided the welding
ined throughout the entire length in accordance with Paragraph satisfies the requirements of 5.2.3 for qualifications and 5.3 for
UW-51 of Section VIII, Division 1, of the ASME Boiler and heat treatment.
Pressure Vessel Code, except as exempt by 5.2.4.1, and 5.2.4.2. 5.2.11.1 Grade WP****Class W – Radiographic examina-
5.2.4.1 The weld in the starting pipe, made to one of the tion of the welds, made with the addition of filler metal, is
pipe or tube product specifications listed in Table 2, shall not required. See 5.2.4.
require radiography, provided that no filler metal is used in 5.2.11.2 Grade WP****Class WX – Radiographic exami-
making the weld. nation of all welds, made with or without the addition of filler
5.2.4.2 Instead of the radiographic examination, and at the metal is required. See 5.2.5.
option of the manufacturer, welds made by the fitting manu- 5.2.11.3 Grade WP****Class WU – Ultrasonic examina-
facturer may be ultrasonically examined in accordance with the tion of all welds, made with or without the addition of filler
Code requirements stated in 5.2.6. metal, is required. See 5.2.6.
5.2.5 Grade WP fittings ordered as Class WX shall meet the
5.2.11.4 Grade CR – Nondestructive examination is not
requirements of ASME B16.9 and shall have all welds, whether
required. See 5.2.8.
made by the fitting manufacturer or the starting material
5.2.12 Stubends may be produced with the entire lap added
manufacturer, radiographically examined throughout their en-
by the welding of a ring, made from plate or flat bar of the
tire length in accordance with Paragraph UW-51 of Section
same alloy grade and composition, to the outside of a straight
VIII, Division 1, of the ASME Boiler and Pressure Vessel
section of pipe, provided the weld is a double welded full
Code, except as exempt by 5.2.5.1. The radiography for this
penetration joint and satisfies the requirements of 5.2.3 for
class of fittings may be done either prior to or after forming at
qualifications and 5.3 for heat treatment.
the option of the manufacturer.
5.2.5.1 Instead of the radiographic examination, and at the 5.2.12.1 Grade WP****Class W – Radiographic examina-
option of the manufacturer, welds, whether made by the fitting tion of all welds, made with the addition of filler metal, is
manufacturer or the starting material manufacturer, may be required. See 5.2.4.
ultrasonically examined in accordance with the Code require- 5.2.12.2 Grade WP****Class WX – Radiographic exami-
ments stated in 5.2.6. nation of all welds, made with or without the addition of filler
5.2.6 Grade WP fittings ordered as Class WU shall meet the metal, is required. See 5.2.5.
requirements of ASME B16.9 and shall have all welds, whether 5.2.12.3 Grade WP****Class WU – Ultrasonic examina-
made by the fitting manufacturer of the starting material tion of all welds, made with or without the addition of filler
manufacturer, ultrasonically examined throughout their entire metal, is required. See 5.2.6.
length in accordance with Appendix 12 of Section VIII, 5.2.12.4 Grade CR – Nondestructive examination is not
Division 1, of the ASME Boiler and Pressure Vessel Code. The required. See 5.2.8.
ultrasonic examination of welds for this class may be per- 5.3 Heat Treatment—All fittings shall be furnished heat
formed either prior to or after forming at the option of the treated. See Table 3 for recommended heat treatments. All
manufacturer. forming or welding shall be done and completed prior to any
5.2.7 Personnel performing NDE examinations shall be final heat treatment. For seamless fittings made without
qualified in accordance with SNT-TC-1A. forming, heat treatment, if any, shall be agreed upon between
5.2.8 Fittings covered in MSS SP-43, MSS SP-95, or MSS purchaser and manufacturer.
SP-97 and ordered as CR*** shall meet the requirements of
MSS SP-43, MSS SP-95, or MSS SP-97, respectively, and do 6. Chemical Composition
not require non-destructive examination.
5.2.9 All joints welded with filler metal shall be finished in 6.1 The material shall conform to the requirements as to
accordance with the requirements of Paragraph UW-35 (a) of chemical composition for the respective material prescribed in
Section VIII, Division 1, of the ASME Boiler and Pressure Table 2.
Vessel Code. 6.2 Records of chemical analysis made in accordance with
5.2.10 Radiographic examination of the weld buildup on the applicable specification listed in Table 2 shall be certifica-
cold-formed stub ends shall not be required provided that all tion that the material of the fitting meets the requirements of
the following steps are adhered to: this specification.

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 B366/B366M − 15
TABLE 3 Heat Treatment
Corrosion- ASME
UNS Heat TreatmentA,B
Resistant Pressure Alloy DEG °F [°C] Quench
Designation
Fittings Fittings
CRN WPN Ni N02200 1650-1700 [900 to 928] Rapid Air/Water
CRNL WPNL Ni, Low C N02201 1650-1700 [900 to 928] Rapid Air/Water
CRNCC WPNCC Ni-Cu N04400 1650-1700 [900 to 928] Rapid Air/Water
CR HX WPHX Ni-Cr-Mo-Fe N06002 2150 [1177]D Rapid Air/Water
CR HG WPHG Ni-Cr-Fe-Mo-Cu N06007 2100-2150 [1150 to 1177] Rapid Air/Water
CR HC 22 WPHC22 Low C-Ni-Mo-Cr N06022 2050 [1121]D Rapid Air/Water
CRV602 WPV602 Ni-Cr-Fe N06025 2200 [1204]E Rapid Air/Water
CR HG 30 WPHG30 Ni-Cr-Fe-Mo-Cu N06030 2150 [1177]D Rapid Air/Water
CRHG35 WPHG35 Ni-Cr-Mo N06035 2050 [1121] Rapid Air/Water
CRV45TM WPV45TM Ni-Cr-Fe N06045 2150 [1177] Rapid Air/Water
CR5923 WP5923 Low C-Ni-Cr-Mo N06059 2050 [1121] Rapid Air/Water
CR HC 2000 WPHC2000 Low C-Ni-Cr-Mo-Cu N06200 2075-2125 [1135-1163] Rapid Air/Water
E E
CRM21 WPM21 Low C-Ni-Cr-Mo-Ta N06210
CRH230 WPH230 Ni-Cr-W-Mo N06230 2150-2250 [1177-1232] Rapid Air/Water
CRHBC1 WPHBC1 Low C-Ni-Mo-Cr N10362 2100B [1147] Rapid Air/Water
CR HC 4 WPHC4 Low C-Ni-Mo-Cr N06455 1950 [1065]D Rapid Air/Water
CRNCI WPNCI Ni-Cr-Fe N06600 1800-1850 [983 to 1010] Rapid Air/Water
CR603GT WP603GT Ni-Cr-Fe-Al N06603 2175 [1189] Rapid Air/Water
CRNCMC WPNCMC Ni-Cr-Mo-Cb N06625 Gr 1 1600 [871] Rapid Air/Water
CRNCMC WPNCMC Ni-Cr-Mo-Cb N06625 Gr 2 2000 [1093]D Rapid Air/Water
CRIN686 WPIN686 Low C-Cr-Ni-Mo N06686 2150 [1177] Rapid Air/Water
CR626Si WP626Si Ni-Cr-Mo-Si N06219 2050 [1121] Rapid Air/Water
CR HG3 WPHG3 Ni-Cr-Fe-Mo-Cu N06985 2100-2150 [1147 to 1177] Rapid Air/Water
CR20CB WP20CB Cr-Ni-Fe-Mo-Cu-Cb N08020 1700-1850 [927 to 1010] Rapid Air/Water
stabilized
CR3127 WP3127 Low C-Ni-Fe-Cr-Mo-Cu N08031 2175 [1189] Rapid Air/Water
CRH120 WPH120 Ni-Cr-Fe N08120 2175-2225 [1189-1220] Rapid Air/Water
CR330 WP330 Ni-Fe-Cr-Si N08330 1900 [1038] Rapid Air/Water
CR6XN WP6XN Fe-Ni-Cr-Mo-N N08367 2025 [1107] Rapid Air/Water
CRNIC WPNIC Ni-Fe-Cr N08800 1800-1900 [983 to 1038]F Rapid Air/Water
CRNIC10 WPNIC10 Ni-Fe-Cr N08810 2100-2150 [1147 to 1177]F Rapid Air/Water
CRNIC11 WPNIC11 Ni-Fe-Cr N08811 2100-2150 [1147 to 1177]F Rapid Air/Water
CRNICMC WPNICMC Ni-Fe-Cr-Mo-Cu N08825 1700-1800 [930 to 983]F Rapid Air/Water
CR1925 WP1925 Low C-Ni-Fe-Cr-Mo-Cu N08925 1800-1900 [983 to 1038] Rapid Air/Water
CR2120 WP2120 Low C-Ni-Cr-Mo N06058 2075 [1135] Rapid Air/Water
CR1925N WP1925N Low C-Ni-Fe-Cr-Mo-Cu-N N08926 2150 [1177] Rapid Air/Water
CRHB WPHB Ni-Mo N10001 1950 [1065]D Rapid Air/Water
CRHN WPHN Ni-Mo-Cr-Fe N10003 2150 [1177]D Rapid Air/Water
CR H242 WPH242 Ni-Mo-Cr-Fe N10242 1925-2025 [1050-1105] Rapid Air/Water
CR HC 276 WPHC276 Low C-Ni-Mo-Cr N10276 2050 [1121]D Rapid Air/Water
CRB10 WPB10 Low C-Ni-Mo-Cr-Fe N10624 2050 [1121] Rapid Air/Water
CRVB4 WPVB4 Ni-Mo N10629 1975 [1080] Rapid Air/Water
CR HB2 WPHB2 Ni-Mo N10665 1950 [1065]D Rapid Air/Water
CR HB3 WPHB3 Ni-Mo N10675 1950 [1065]D Rapid Air/Water
CRH160 WPH160 Ni-Co-Cr-Si N12160 2025 [1107]D Rapid Air/Water
CR3033 WP3033 Low C-Cr-Ni-Fe-N R20033 2050 [1121] Rapid Air/Water
CRH556 WPH556 Ni-Fe-Cr-Co R30556 2150 [1177]D Rapid Air/Water
A
Recommended set temperatures – Different temperatures may be selected by either the purchaser or the manufacturer.
B
Set temperature, ±25°F [15°C].
C
Yield strength shall be 25 000 psi [172 MPa] min, for all hot-formed, annealed fittings made from WPNC material.
D
Minimum temperature.
E
Annealing temperature and quench shall be agreed upon between purchaser and manufacturer.
F
Heat treatment is highly dependent on intended service temperature – consult material manufacturer for specific heat treatments for end use temperature.

6.3 If a product (check) analysis is made by the purchaser, 7. Mechanical Properties and Other Requirements
the material shall conform to the requirements for product
7.1 Tensile Requirements:
(check) analysis prescribed for the respective product in Table
2 and Specification B880 for check analysis. 7.1.1 (All Table 2 alloys except for UNS N06625 Grade 1 or
Grade 2).
6.4 In fittings of welded construction, the alloy content of
the deposited weld metal shall conform to that required of the 7.1.1.1 Material used in the manufacture of the fittings shall
base metal or for equivalent weld metal as given in the AWS conform to the requirements for tensile properties as prescribed
Filler Metal Specification A5.11 and A5.14. for the respective product in Table 2.

6
 B366/B366M − 15
7.1.1.2 Finished fittings shall conform to the properties for test piece representing fittings manufactured from bars, plate or
the respective material and temper as prescribed in the speci- forgings shall have a cross section equal to the greatest cross
fications referred to in Table 2. When required, the properties section of the fitting, a test piece representing fittings manu-
of fittings made from forging stock shall be as agreed upon factured from pipe shall have an outside diameter and wall
between the producer and the purchaser. thickness equal to those of the fitting and a test piece for fittings
7.1.1.3 Tension tests of the finished fittings are not required, of welded construction, made with the addition of filler metal,
unless otherwise agreed upon between the manufacturer and shall be prepared to the same welding procedures and from the
the purchaser. same heat of material as the fittings it represents. Tension
7.1.2 Tensile Requirements (For fittings made to meet the specimens representing fittings of welded construction, made
mechanical properties of UNS N06625 Grade 1): with the addition of filler metal, are to include the weld and be
7.1.2.1 At the option of the manufacturer, the material used prepared so that the weld is at the specimen’s midlength
in the manufacture of UNS N06625 Grade 1 fittings shall location.
conform to the mechanical property requirements of either 7.1.3.4 The finished fittings shall conform to the minimum
UNS N06625 Grade 1 or Grade 2 as prescribed for the UNS N06625 Grade 2 mechanical properties as prescribed for
respective product in Table 2. the representative starting raw material product listed in Table
7.1.2.2 Tension tests are required in accordance with 2 except that fittings of welded construction are exempt from
7.1.2.3. the tensile ductility requirement (elongation) and the yield
7.1.2.3 Tension tests are required per lot (Note S2.3) per strength requirements. The minimum mechanical properties for
furnace charge. Tension specimens may be obtained from a fittings made from forging stock shall be as agreed upon
fitting or a representative test piece (Note S2.2). Tension between manufacturer and purchaser.
specimens representing fittings of welded construction, made 7.2 Hydrostatic Tests:
with the addition of filler metal, are to include the weld and be
7.2.1 Hydrostatic testing of wrought fittings is not required
prepared so that the weld is at the specimen’s midlength
by this specification.
location.
7.1.2.4 The finished fittings shall conform to the minimum 7.2.2 All fittings shall be capable of withstanding without
UNS N06625 Grade 1 mechanical properties as prescribed for failure, leakage, or impairment of their serviceability, a test
the respective starting raw material product listed in Table 2 pressure prescribed in the specifications for the pipe with
except that fittings of welded construction are exempt from the which the fitting is recommended to be used.
tensile ductility requirement (elongation) and the yield strength
requirements. The minimum mechanical properties for fittings 8. Dimensions
made from forging stock shall be as agreed upon between 8.1 Fittings or components produced in accordance with this
manufacturer and purchaser. specification shall have sizes, shapes, and dimensions in
7.1.3 Tensile Requirements (For fittings made to meet the accordance with those specified in ASME B16.9, ASME
mechanical properties of UNS N06625 Grade 2): B16.11, MSS SP-43, MSS SP-95, MSS SP-97, ASME H34.1,
7.1.3.1 At the option of the manufacturer, the material used ASME H34.2, or ASME H34.3.
in the manufacture of UNS N06625 Grade 2 fittings shall
conform to the mechanical property requirements of either 9. Workmanship, Finish, and Appearance
UNS N06625 Grade 1 or Grade 2 as prescribed for the
9.1 The fittings shall be free of injurious defects and have a
respective product in Table 2.
workmanlike finish. Minor defects may be removed by
7.1.3.2 Tension tests are not required provided the grade of
grinding, provided the wall thickness is not decreased to less
starting raw material is designated as UNS N06625 Grade 2 in
than the allowable specification minimum and provided the
the raw material manufacturer’s MTR description and the final
grinding is smooth and leaves no shoulders.
heat treat temperature of the fittings is in compliance with the
recommended solution annealing heat treat procedure for the 9.2 The fittings shall be cleaned free of scale.
grade. Tension tests are required if the grade of starting raw
material is designated as UNS N06625 Grade 1 in the raw 10. Inspection
material manufacturer’s MTR description.
10.1 Inspection of the material by the purchaser at the place
7.1.3.3 Tension tests, if required, are to be performed per lot of manufacture shall be made as agreed upon between the
(Note S2.3) provided that all heat treatments are performed in purchaser and the manufacturer as part of the purchase
furnaces controlled within a 625°F [15°C] range of set point contract.
and are equipped with calibrated recording pyrometers so that
all other subsequent heat treatments can be conducted within
11. Rejection and Rehearing
the same 625°F [15°C] temperature range as the furnace
charge that contained the test specimen. Tension specimens 11.1 Material that fails to conform to the requirements of
may be obtained from a fitting or a representative test piece. In this specification may be rejected. Rejection should be reported
this paragraph only, a representative test piece is defined as a to the producer or supplier promptly and in writing. In case of
test specimen from the same heat of fitting raw material having dissatisfaction with the results of the test, the producer or
approximately the same amount of working. In addition, the supplier may make claim for a rehearing.

7
 B366/B366M − 15
12. Certifications 13. Product Marking
12.1 Test reports are required for all fittings covered by this 13.1 The manufacturer’s name or trademark, material,
specification. Each test report shall include the following grade, if applicable, the size and schedule number, the desig-
information: nation as shown in Table 2, under “Marking,” either column 1
12.1.1 The year-date of the specification and class to which for Grade CR fittings or column 2 for Grade WP fittings, shall
the fitting was furnished, be stamped, stenciled, or otherwise permanently marked on
12.1.2 Heat numbers or serial number traceable to heat each fitting. Grade WP fitting marking also must include the
numbers,
suffix in accordance with 5.2. On wall thicknesses thinner than
12.1.3 Chemical analyses for all starting materials,
0.083 in. [2.1 mm], no steel stamps or other indented markings
12.1.4 Mechanical properties for all starting materials, or
shall be used. When the size does not permit complete
actual mechanical properties if tension testing was required,
12.1.5 For construction with filler metal added, weld metal marking, identification marks may be omitted in the sequence
chemical analyses or AWS classification, shown in MSS SP-25. See Table 4 for marking example of
12.1.6 For welded stub ends, the construction method per grades and classes.
5.2.11 or 5.2.12 shall be stated, NOTE 1—When steel stamps are used, the marking shall not be deep
12.1.7 Heat treatment per Table 3, enough to cause cracks or to reduce the wall thickness of the fittings below
12.1.8 Results of all nondestructive examinations, the minimum allowed by the applicable specification.
12.1.9 Results of all tests required by Supplementary Re-
quirements and the order, and 14. Keywords
12.1.10 Statement that the fitting was manufactured,
14.1 nickel alloy fittings
sampled, tested and inspected in accordance with the specifi-
cation and was found to meet the requirements.

SUPPLEMENTARY REQUIREMENTS

These requirements shall not be considered unless specified in the order, in which event the
supplementary requirements specified shall be made at the place of manufacture, unless otherwise
agreed upon.

S1. Product Analysis (Note S2.1) location of the specimen. However, in no case shall the tensile
S1.1 A product analysis shall be made from each heat of properties of the finished fittings be less than the requirements
base metal and, if of welded construction, from each lot (Note of the pipe specifications listed in Table 2, except that weld
S2.3) number of welding material of the fittings offered for specimens are exempt from the tensile ductility requirements.
delivery. The analysis shall conform to the requirements NOTE S2.1—If the results of any of the tests specified in Sections S1 or
S2 do not conform to requirements, retests may be made at the manufac-
specified in Section 6. turer’s expense on additional fittings or representative test pieces of
double the original number from the same heat or lot as defined in Section
S2. Tension Test (Note S2.1) S1 or S2. If either of the additional test pieces fails, the lot shall be
S2.1 One tension test shall be made on one fitting or rejected.
representative test piece (Note S2.2) per lot (Note S2.3) of NOTE S2.2—Representative Test Piece: Where the test specimen for the
tension test cannot be taken from a fitting due to size limitations, a
fittings. If the fittings are of welded construction, made with the representative test shall be obtained. The test piece shall be from the same
addition of filler metal, the tension specimen shall include the heat and heat treated in the same batch or charge as the fittings it
weld and be prepared so that the weld is at the midlength represents, and shall have approximately the same amount of working. In

TABLE 4 Product Marking Examples for Grades and Classes

Grade and Class Marking Description
CRN Single grade: no classes in CR grades
CRN/NL Multiple grades, meet chemical and
mechanical properties of each
WPN-S Single grade: seamless
WPN-W Single grade: welded: RT or UT pipe
welds with filler metal and all fitting
manufacturer’s welds
WPN-WX Single grade: welded: RT all welds
with or without filler metal
WPN-WU Single grade: welded: UT all welds
with or without filler metal
WPN/NL-S Multiple grades: meet chemical and
mechanical properties of each:
seamless

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 B366/B366M − 15
addition, test pieces representing fittings manufactured from bars, plate, or S5. Bar Stock Fittings
forgings shall have a cross section equal to the greatest cross section of the
fitting, and test pieces representing fittings manufactured from pipe shall S5.1 Fittings machined from solid bar stock are not permit-
have an outside diameter and wall thickness equal to those of the fitting. ted.
The test piece for fittings of welded construction, made with the addition
of filler metal, shall be prepared to the same weld procedures and from the S6. Positive Material Identification Examination
same heats of material as the fittings it represents.
NOTE S2.3—A lot shall consist of all fittings of the same type, size, and S6.1 Product shall receive Positive Material Identification to
wall thickness, manufactured from one heat of material, and, if welding is ensure that the purchaser is receiving product of the correct
performed, using the same size and AWS classification welding product. material grade prior to shipment of the product. This exami-
nation is a method to assure that no material grade mix-up has
S3. Liquid Penetrant Test happened during manufacturing and marking of the product.
S3.1 All surfaces shall be liquid penetrant tested. The S6.2 Product shall receive a Positive Material Identification
method shall be in accordance with Practice E165. Acceptance examination by Guide E1916.
limits shall be as specified by the purchaser. S6.3 The quantity examined shall be 100 % of the product.
S6.4 All product that is not of the correct material grade
S4. Hydrostatic Test shall be rejected.
S4.1 A hydrostatic test shall be applied as agreed upon S6.5 The method of product marking after examination
between the manufacturer and purchaser. shall be agreed upon between the manufacturer and purchaser.

SUMMARY OF CHANGES

Committee B02 has identified the location of selected changes to this standard since the last issue (B366–10a)
that may impact the use of this standard. (Approved October 1, 2015.)

(1) Added metric values.

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