This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles

for the
Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.

Designation: A815/A815M − 21

Standard Specification for

Wrought Ferritic, Ferritic/Austenitic, and Martensitic
Stainless Steel Piping Fittings1
This standard is issued under the fixed designation A815/A815M; 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 The values stated in either SI units or inch-pound units

1.1 This specification covers two general classes, WP and are to be regarded separately as standard. Within the text, the
CR, of wrought ferritic, ferritic/austenitic, and martensitic SI units are shown in brackets. The values stated in each
stainless steel fittings of seamless and welded construction system may not be exact equivalents; therefore, each system
covered by the latest revision of Specification A960/A960M. shall be used independently of the other. Combining values
Fittings differing from these standards may be furnished in from the two systems may result in non-conformance with the
accordance with Supplementary Requirement S58 of Specifi- standard.
cation A960/A960M. 1.6 This international standard was developed in accor-
1.1.1 Class WP fittings are subdivided into four subclasses: dance with internationally recognized principles on standard-
Classes WP-S, WP-W, WP-WX, and WP-WU. They are ization established in the Decision on Principles for the
manufactured to the requirements of Specification A960/ Development of International Standards, Guides and Recom-
A960M, and they shall have pressure ratings compatible with mendations issued by the World Trade Organization Technical
13.2. Class WP-S fittings are those manufactured from seam- Barriers to Trade (TBT) Committee.
less product by a seamless method of manufacture (marked
with class symbol WP-S); Class WP-W fittings are those which 2. Referenced Documents
contain welds where the fitting fabrication or construction
welds have been radiographed (marked with class symbol 2.1 ASTM Standards:2
WP-W); and Class WP-WX fittings are those which contain A262 Practices for Detecting Susceptibility to Intergranular
welds where all welds have been radiographed (marked with Attack in Austenitic Stainless Steels
class symbol WP-WX); and Class WP-WU fittings are those A388/A388M Practice for Ultrasonic Examination of Steel
which contain welds where all welds have been ultrasonically Forgings
tested (marked with class symbol WP-WU). A751 Test Methods and Practices for Chemical Analysis of
1.1.2 Class CR fittings are those manufactured to the Steel Products
requirements of MSS SP-43, and they shall have pressure A763 Practices for Detecting Susceptibility to Intergranular
ratings compatible with 13.3. Attack in Ferritic Stainless Steels
A923 Test Methods for Detecting Detrimental Intermetallic
1.2 This specification does not apply to cast fittings. Phase in Duplex Austenitic/Ferritic Stainless Steels
1.3 Optional supplementary requirements are provided. A960/A960M Specification for Common Requirements for
When desired, one or more of these may be specified in the Wrought Steel Piping Fittings
order. E165/E165M Practice for Liquid Penetrant Testing for Gen-
1.4 This specification is expressed in both inch-pound units eral Industry
and in SI units. However, unless the order specifies the 2.2 ASME Standards:3
applicable “M” specification designation [SI units], the mate- B16.9 Factory-Made Wrought Butt-Welding Fittings
rial shall be furnished to inch-pound units. B16.11 Forged Fittings, Socket-Welding and Threaded

1 2
This specification is under the jurisdiction of ASTM Committee A01 on Steel, For referenced ASTM standards, visit the ASTM website, www.astm.org, or
Stainless Steel and Related Alloys and is the direct responsibility of Subcommittee contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
A01.22 on Steel Forgings and Wrought Fittings for Piping Applications and Bolting Standards volume information, refer to the standard’s Document Summary page on
Materials for Piping and Special Purpose Applications. the ASTM website.
3
Current edition approved Nov. 1, 2021. Published November 2021. Originally Available from American Society of Mechanical Engineers (ASME), ASME
approved in 1983. Last previous edition approved in 2020 as A815/A815M – 20. International Headquarters, Two Park Ave., New York, NY 10016-5990, http://
DOI: 10.1520/A0815_A0815M-21. www.asme.org.

*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

1
 A815/A815M − 21
2.3 MSS Standards:4 5.2 All classes of fittings shall be heat treated in accordance
MSS SP-43 Standard Practice for Light Weight Stainless with Section 6.
Steel Butt-Welding Fittings 5.3 Fittings ordered as Class WP-S shall be of seamless
MSS SP-79 Socket-Welding Reducer Inserts construction and shall meet all requirements of Specification
MSS SP-83 Steel Pipe Unions, Socket-Welding and A960/A960M.
Threaded
MSS SP-95 Swage(d) Nipples and Bull Plugs 5.4 Fittings ordered as Class WP-W shall meet the require-
MSS SP-97 Integrally Reinforced Forged Branch Outlet ments of Specification A960/A960M and (1) shall have all
Fittings—Socket Welding, Threaded and Buttwelding welds made by the fitting manufacturer and all pipe welds
Ends made with the addition of filler metal radiographically exam-
2.4 ASME Boiler and Pressure Vessel Codes:3 ined throughout the entire length in accordance with Paragraph
Section VIII Division I UW-51 of Section VIII, Division 1, of the ASME Boiler and
Section IX Pressure Vessel Code; and (2) shall not require radiography of
2.5 ASNT Standard:5 the starting pipe weld if the pipe was welded without the
SNT-TC-1A Recommended Practice for Nondestructive addition of filler metal. In place of radiographic examination,
Testing Personnel Qualification and Certification welds made by the fitting manufacturer may be ultrasonically
examined in accordance with the code requirements stated in
3. Common Requirements and Ordering Information 5.6.
3.1 Material furnished to this specification shall conform to 5.5 Fittings ordered as Class WP-WX shall meet the re-
the requirements of Specification A960/A960M including any quirements of Specification A960/A960M and shall have all
supplementary requirements that are indicated in the purchase welds, whether made by the fitting manufacturer or the starting
order. Failure to comply with the common requirements of material manufacturer, radiographically examined throughout
Specification A960/A960M constitutes nonconformance with their entire length in accordance with Paragraph UW-51 of
this specification. In case of conflict between this specification Section VIII, Division I of the ASME Boiler and Pressure
and Specification A960/A960M, this specification shall pre- Vessel Code. The radiography of welds for this class of fittings
vail. can be done either prior to or after forming at the option of the
3.2 Specification A960/A960M identifies the ordering infor- manufacturer.
mation that should be complied with when purchasing material 5.6 Fittings ordered as Class WP-WU shall meet the re-
to this specification. quirements of Specification A960/A960M and shall have all
welds, whether made by the fitting manufacturer or the starting
4. Materials material manufacturer, ultrasonically examined throughout
4.1 The material for fittings shall consist of forgings, bars, their entire length in accordance with Appendix 12 of Section
plates, or seamless or welded tubular products that conform to VIII, Division 1 of ASME Boiler and Pressure Vessel Code.
the chemical requirements in Table 1. 5.7 The radiography or ultrasonic examination for this class
4.2 The steel shall be melted by one of the following of fittings may be done at the option of the manufacturer, either
processes: prior to or after forming.
4.2.1 Electric furnace (with separate degassing and refining 5.8 Personnel performing NDE examinations shall be quali-
optional), fied in accordance with SNT-TC-1A.
4.2.2 Vacuum furnace, or
4.2.3 Electric furnace followed by vacuum or electroslag- 5.9 Fittings covered in Specification A960/A960M and
consumable remelting. ordered as CR shall meet the requirements of Specification
A960/A960M and do not require nondestructive examination.
4.3 If secondary melting is employed, the heat shall be
defined as all ingots remelted from a primary heat. 5.10 All classes of fittings shall have the welders, welding
operators, and welding procedures qualified under the provi-
5. Manufacture sions of Section IX of the ASME Boiler and Pressure Vessel
Code except that starting pipe welds made without the addition
5.1 Forming—Forging or shaping operations may be per-
of filler metal do not require such qualification.
formed by hammering, pressing, piercing, extruding, upsetting,
rolling, bending, fusion welding, machining or by combination 5.11 All joints welded with filler metal shall be finished in
of two or more of these operations. The forming procedure accordance with the requirements of Paragraph UW-35 (a) of
shall be so applied that it will not produce surface discontinui- Section VIII, Division 1, of the ASME Boiler and Pressure
ties deeper than 5 % of the specified nominal thickness of the Vessel Code.
fitting. 5.12 Fittings machined from bar shall be restricted to NPS 4
or smaller.
4
Available from Manufacturers Standardization Society of the Valve and Fittings 5.12.1 All caps machined from bar shall be examined by
Industry (MSS), 127 Park St., NE, Vienna, VA 22180-4602, http://www.mss- liquid penetrant in accordance with Practice E165/E165M.
hq.com.
5
Available from American Society for Nondestructive Testing (ASNT), P.O. Box 5.13 Weld buildup is permitted to dimensionally correct
28518, 1711 Arlingate Ln., Columbus, OH 43228-0518, http://www.asnt.org. unfilled areas produced during cold forming of stub ends.

2
 A815/A815M − 21
TABLE 1 Chemical Requirements
NOTE 1—Where an ellipsis (. . .) appears in this table, there is no requirement.
Composition, %
GradeA
Phos-
Grade Grade Carbon, Manga- Sulfur, Silicon, Chrom- Molyb- Ni-
UNS phorus, NickelB CopperB Titanium Other
WP CR max neseB max max ium denum trogenB
max
Ferritic Steels
WP27 CR27 S44627 0.010 0.75 0.020 0.020 0.40 0.50 25.0– 0.75– 0.20 0.015 ... NbD
27.5 1.50 0.05–0.20

WP33 CR33 S44626 0.06 0.75 0.040 0.020 0.75 0.50 25.0– 0.75– 0.20 0.040 0.20–1.00 ...
27.0 1.50 (7×(C+N)) min

WP429 CR429 S42900 0.12 1.0 0.040 0.030 0.75 0.50 14.0– ... ... ... ... ...
16.0

WP430 CR430 S43000 0.12 1.00 0.040 0.030 1.00 0.50 16.0– ... ... ... ... ...
18.0

WP430TI CR430Ti S43036 0.10 1.00 0.040 0.030 1.00 0.75 16.0– ... ... ... (5×C) min 0.75 ...
19.5 max

WP446 CR446 S44600 0.20 1.50 0.040 0.030 0.75 0.50 23.0– ... ... 0.25 ... ...
27.0
Ferritic/Austenitic Steels
WPS31803 CRS31803 S31803 0.030 2.00 0.030 0.020 1.0 4.5– 21.0– 2.5– ... 0.08– ... ...
6.5 23.0 3.5 0.20
WPS32101 CRS32101 S32101 0.040 4.0– 0.040 0.030 1.00 1.35– 21.0– 0.10– 0.10– 0.20– ... ...
6.0 1.70 22.0 0.80 0.80 0.25
WPS32202 CRS32202 S32202 0.030 2.00 0.040 0.010 1.00 1.00– 21.5– 0.45 ... 0.18– ... ...
2.80 24.0 0.26
WPS32750 CRS32750 S32750 0.030 1.20 0.035 0.020 0.8 6.0– 24.0– 3.0– 0.5 0.24– ... ...
8.0 26.0 5.0 0.32
WPS32950 CRS32950 S32950 0.030 2.00 0.035 0.010 0.60 3.5– 26.0– 1.00– ... 0.15– ... ...
5.2 29.0 2.50 0.35
WPS32760 CRS32760 S32760 0.030 1.00 0.030 0.010 1.00 6.0– 24.0– 3.0– 0.50– 0.20– ... W
8.0 26.0C 4.0C 1.00 0.30C 0.50–1.00

WPS39274 CRS39274† S39274 0.030 1.00 0.030 0.020 0.80 6.0– 24.0– 2.50– 0.20– 0.24– ... W
8.0 26.0 3.50C 0.80 0.32 1.50–2.50
WPS32550 CRS32550 S32550 0.04 1.50 0.040 0.030 1.00 4.5– 24.0– 2.9– 1.50– 0.10– ... ...
6.5 27.0 3.9 2.50 0.25
WPS32205 CRS32205 S32205 0.030 2.00 0.030 0.020 1.00 4.5– 22.0– 3.0– ... 0.14– ... ...
6.5 23.0 3.5 0.20
Martensitic Steels
WP410 CR410 S41000 0.15 1.00 0.040 0.030 1.00 0.50 11.5– ... ... ... ... ...
max 13.5
WPS41008 CRS41008 S41008 0.08 1.00 0.040 0.030 1.00 0.60 11.5– ... ... ... ... ...
13.5
WPS41500 CRS41500 S41500 0.05 0.50– 0.030 0.030 0.60 3.5– 11.5– 0.50– ... ... ... W
1.00 5.5 14.0 1.00 0.50–1.00

A
Naming system developed and applied by ASTM International.
B
Maximum unless otherwise indicated.
C
% Cr + 3.3 × % Mo + 16 × % N = 40 min.
D
Niobium and columbium are interchangeable names for the same element and both names are acceptable for use in A01.22 specifications.

Radiographic examination of the weld buildup shall not be 5.13.4 Repair of areas in the weld is permitted, but 5.13.1,
required provided that all of the following steps are adhered to: 5.13.2, and 5.13.3 must be repeated.
5.13.1 The weld procedure and welders or welding opera-
tors meet the requirements of 5.10, 5.14 Stub ends may be produced with the entire lap added as
5.13.2 Heat-treatment is performed after welding and prior weld metal to a straight pipe section provided the welding
to machining, satisfies the requirements of 5.10 for qualifications and Section
5.13.3 All weld surfaces are liquid penetrant examined in 6 for post weld heat treatment.
accordance with Appendix 8 of Section VIII, Division 1 of the 5.14.1 Class WP-W—Radiographic inspection of the weld is
ASME Boiler and Pressure Vessel Code, and required (see 5.4).

3
 A815/A815M − 21
5.14.2 Class WP-WX—Radiographic inspection of all welds 6. Heat Treatment
is required (see 5.5). 6.1 Unless otherwise stated herein, heat treatment shall be
5.14.3 Class WP-WU—Ultrasonic inspection of all welds is performed after welding and in accordance with the require-
required (see 5.6). ments of Table 2.
5.14.4 Class CR—Nondestructive examination is not re- 6.1.1 No final heat treatment of welded fittings (HT-O)
quired (see 5.9). fabricated from ferritic/austenitic plate that has been heat
treated as required by Table 2 for the particular grade, is
5.15 Stub ends may be produced with the entire lap added
required, provided material representative of the fittings, in-
by the welding of a ring, made from plate or bar of the same
cluding base metal, weld metal, and heat affected zone, passes
alloy grade and composition, to the outside of a straight section
a Test Methods A923 Method B or C (See Note 1) corrosion
of pipe, provided the weld is double welded, is a full
evaluation per heat. Each fitting supplied under this require-
penetration joint, satisfies the requirements of 5.10 for quali-
ment shall be stenciled with the suffix HT-O.
fications and Section 6 for post weld heat treatment.
6.1.2 For materials not listed in Table 3 of Test Methods
5.15.1 Class WP-W—Radiographic inspection of all welds, A923, the HT-O provision does not apply.
made with the addition of filler metal is required (see 5.4). NOTE 1—The Test Methods A923 test method (B or C) is at the
5.15.2 Class WP-WX—Radiographic inspection of all manufacturer’s option, unless otherwise specified by the purchaser.
welds, made with or without the addition of filler metal, is 6.2 All fittings machined directly from forgings or bars (see
required (see 5.5). 5.12), previously heat treated in accordance with the require-
5.15.3 Class WP-WU—Ultrasonic inspection of all welds, ments specified in Table 2, need not be reheat treated.
made with or without the addition of filler metal, is required
(see 5.6). 7. Chemical Composition
5.15.4 Class CR—Nondestructive examination is not re- 7.1 The chemical composition of each cast or heat shall be
quired (see 5.9). determined and shall conform to the requirements of the

TABLE 2 Heat Treatment

Stainless Steel All WP and CR Grades Temperature Cooling Tempering
Temperature
Ferritic All $ 1200 °F [650 °C] As appropriate for grade Not specified
Ferritic/Austenitic S31803 1870–2010 °F Water quench or Not required
[1020–1100 °C] rapidly cooled by
other means
S32101 1870 °F [1020 °C] min Water quench or Not required
rapidly cooled by
other means
S32202 1870–1975 °F Water quench or Not required
[1020–1080 °C] rapidly cooled by
other means
S32205 1870–2010 °F Water quench Not required
[1020–1100 °C]
S32750 1880–2060 °F Water quench or Not required
[1025–1125 °C] rapidly cooled by
other means
S32760 2010–2085 °F Water quench or Not required
[1100–1140 °C] rapidly cooled by
other means
S39274 1920–2060 °F Water quench or Not required
[1050–1125 °C] rapidly cooled by
other means
S32550 1950–2060 °FA Water quench Not required
[1065–1125 °C]A
S32950 Not specified Not specified Not required
Martensitic S41000 $ 1200°F [650°C] Not specified Not specified
S41008 > 1200°F [650°C] In still air Not specified
as appropriate
for grade
S41500 $ 1750 °F [955 °C] Air cool to # 200 °F 1050–1150 °F
[95 °C] prior to any [565–620 °C]
optional intermediate
temper and prior to
final temper.
A
The higher temperature (2000 to 2060 °F [1095 to 1125 °C]) PWHT is best used on welded product—the lower temperature PWHT (1950 to 2010 °F [1065 to 1100 °C])
is best used on wrought or seamless products only.

4
 A815/A815M − 21
chemical composition for the respective grades of materials that the material of hot-finished fittings meets the tensile
listed in Table 1. Methods and practices relating to chemical requirements of this specification provided the heat treatments
analyses required by this specification shall be in accordance are the same. For purposes of tensile, yield and elongation
with Methods, Practices, and Definitions A751. Product analy- requirements listed in Table 3, the tensile specimen shall
sis tolerances in accordance with Specification A960/A960M consist of base metal only. If the purchaser requires results,
are applicable. involving the weld, in addition to the base metal only results,
7.2 Except as listed below, in fittings of welded then the S2 supplemental requirement of this specification shall
construction, the composition of the deposited weld shall be specified on the purchase order. When S2 is specified, the
conform to the same requirements as the base metal. weld metal must meet only the minimum ultimate tensile
7.2.1 Welds on S32950 base metal shall be made with strength of Table 3.
nominal 26 % Cr, 8 % Ni, 2 % Mo weld metal.
9. Hardness Requirements
7.2.2 Welds on S31803 and S32205 base metals shall
conform to the same requirements as the base metal or shall be 9.1 Fittings shall not exceed the maximum hardness shown
made with nominal 22 % Cr, 9 % Ni, 3 % Mo or 25 % Cr, 9 % in Table 3.
Ni, 4 % Mo weld metal.
7.2.3 Welds on S32202 base metal shall be made with 10. Dimensions
nominal 22 % Cr, 9 % Ni, 3 % Mo weld metal. 10.1 The sizes, shapes, and dimensions of the fittings
7.2.4 Welds on S32750 and S32760 base metals may be covered by ASME B16.9, ASME B16.11, MSS SP-43, MSS
made with nominal 25 % Cr, 9 % Ni, 4 % Mo weld metal. SP-79, MSS SP-83, MSS SP-95, or MSS SP-97 shall be as
specified in those standards.
8. Tensile Requirements
10.2 Fittings of size or shape differing from these standards,
8.1 The tensile properties of the fitting material shall con- but meeting all other requirements of this specification, may be
form to the requirements of Table 3. The testing and reporting furnished in accordance with Supplementary Requirement S58
shall be performed in accordance with Specification A960/ of Specification A960/A960M.
A960M.
8.2 The fittings manufacturer shall perform a tensile test on 11. Surface Finish, Appearance, and Corrosion
material representative of the finished fitting. Records of the Protection
tensile test made on the starting material may be certification 11.1 In addition to the requirements of this section, the
requirements of Specification A960/A960M apply.
TABLE 3 Tensile and Hardness Requirements 11.2 Fittings supplied under this specification shall be
Yield
Elongation examined visually. Selected typical surface discontinuities
Tensile in 2 in.
All WP and CR Strength, HBW shall be explored for depth. The fittings shall be free from
Strength,A [50 mm]
Grades min, ksi [MPa] max surface discontinuities that penetrate more than 5 % of the
or 4D,
ksi [MPa]
min, % specified nominal wall thickness, except as defined in 11.4 and
Ferritic Steels: 11.5, and shall have a workmanlike finish.
S44627 40 [275] 65 [450]– 20.0 190
90 [620] 11.3 Surface discontinuities deeper than 5 % of the specified
S44626 45 [310] 68 [470]– 20.0 241 nominal wall thickness, except as defined in 11.4 and 11.5,
93 [640]
S42900 35 [240] 60 [415]– 20.0 190 shall be removed by the manufacturer by machining or
85 [585] grinding to sound metal, and the repaired areas shall be well
S43000 35 [240] 65 [450]– 20.0 190 faired. The wall thickness at all points shall be at least 871⁄2 %
90 [620]
S43036 35 [240] 60 [415]– 20.0 190 of the specified nominal wall thickness, and the diameters at all
85 [585] points shall be within the specified limits.
S44600 40 [275] 70 [485]– 18.0 207
95 [655] 11.4 Surface checks (fish scale) deeper than 1⁄64 in. [0.4 mm]
Ferritic/Austenitic Steels: shall be removed.
S31803 65 [450] 90 [620] 20.0 290
S32101 65 [450] 94 [650] 30.0 290 11.5 Mechanical marks deeper than 1⁄16 in. [1.6 mm] shall be
S32202 65 [450] 94 [650] 30.0 290 removed.
S32205 65 [450] 95 [655] 20.0 290
S32750 80 [550] 116 [800] 15.0 310 11.6 When the removal of a surface discontinuity reduces
S32760 80 [550] 109 [750] 25.0 270
S32950 70 [485] 100 [690] 15.0 290
the wall thickness below 871⁄2 % of the specified nominal wall
S39274 80 [550] 116 [800] 15.0 310 thickness at any point, the fitting shall be subject to rejection or
S32550 80 [550] 110 [760] 15.0 302 to repair as provided in 12.1.
Martensitic Steels:
S41000 30 [205] 70 [485]– 20.0 207
95 [655] 12. Repair by Welding
S41008 30[205] 60[415] 22.0 183
S41500 90 [620] 110 [760]– 15.0 295
12.1 Repair by Welding:
135 [930] 12.1.1 Repair welding, of the base metal by the
A
Minimum unless otherwise indicated. manufacturer, is permissible for fittings made to the dimen-
sional standards listed in 10.1 or for other standard fittings

5
 A815/A815M − 21
made for stock. Prior approval of the purchaser is required to the rejection report. In case of dissatisfaction with the test
repair special fittings made to the purchaser’s requirements. results, the manufacturer may make claim for a rehearing
Repair by welding shall neither exceed 10 % of the outside within the period that the samples are preserved.
surface area of the fitting nor 331⁄3 % of the nominal wall
thickness. 16. Certification
12.1.2 The welding procedure and welders shall be qualified
16.1 Test reports are required for all fittings covered by this
in accordance with Specification A960/A960M.
specification. Each test report shall meet the requirements in
12.1.3 The alloy content (carbon, chromium, nickel,
Specification A960/A960M as well as include the following
molybdenum, niobium, and titanium) of the deposited weld
information specific to this specification:
metal shall be within the same percentage range as permitted
for the base metal. (Warning—When selecting the filler metal 16.1.1 Chemical analysis results for all starting materials,
and welding procedure, consideration should be given to their Section 7, (Table 1), reported results shall be to the same
effect on corrosion resistance in service.) number of significant figures as the limits specified in Table 1
12.1.4 Surface discontinuities deeper than 5 % of the speci- for that element,
fied nominal wall thickness shall be removed by mechanical 16.1.2 Starting material; plate, bar, pipe (specify welded or
means or thermal cutting or gouging methods. Cavities pre- seamless), forging,
pared for welding shall be examined by the liquid penetrant 16.1.3 Tensile property results, Section 8, (Table 3), report
method of Practice E165/E165M. No cracks shall be permitted the yield strength and tensile strength in ksi [MPa] and
in the prepared cavities. elongation in percent,
12.1.5 The weld repair shall be permanently identified with 16.1.4 Seamless or welded construction,
the welder’s stamp or symbol in accordance with Specification 16.1.5 For construction with filler metal added, weld metal
A960/A960M. specification number,
12.1.6 Weld repair area(s) shall be blended uniformly to the 16.1.6 For welded fittings, construction method, weld
base metal and shall be examined by liquid penetrant in process, and procedure specification number,
accordance with Practice E165/E165M. No cracks shall be 16.1.7 Heat treatment type, Section 6 (Table 2),
permitted in the weld or surrounding 1⁄2 in. [13 mm] of base 16.1.8 Hardness results, Section 9 (Table 3),
metal.
16.1.9 Results of all nondestructive examinations, and
12.1.7 After weld repair, material shall be heat treated in
16.1.10 Any supplementary testing required by the purchase
accordance with Section 6.
order.
12.2 The fittings shall be cleaned free of scale.
13. Hydrostatic Tests 17. Product Marking
13.1 Hydrostatic testing is not required by this specification. 17.1 In addition to marking requirements of Specification
A960/A960M, the following additional marking requirements
13.2 Each fitting of Class WP shall be capable of withstand-
shall apply:
ing without failure, leakage, or impairment of serviceability, a
test pressure equal to that prescribed for the specified matching 17.1.1 Marking paint or ink shall not contain harmful
pipe or equivalent material. amounts of chlorides, metals, or metallic salt, such as zinc or
copper, that cause corrosive attack on heating. On wall
13.3 Each fitting of Class CR, except tees covered in 13.3.1, thicknesses thinner than 0.083 in. [2.1 mm], no metal impres-
shall be capable of withstanding without failure, leakage, or sion stamps shall be used. Vibrating pencil marking is accept-
impairment of serviceability, a test pressure based on the able.
ratings in MSS SP-43. 17.1.2 Threaded or socket-welding fittings shall be marked
13.3.1 Class CR tees fabricated using intersection welds with the pressure class. Plugs and bushings furnished to ASME
shall be capable of passing a hydrostatic test based on 70 % of B16.11 requirements are not required to be marked. The class
the ratings in MSS SP-43. S marking need not be added to the material grade for threaded
14. Rejection or socket-welded fittings.
14.1 Unless otherwise specified, any rejection based on tests 17.1.3 When agreed upon between the purchaser and
by the purchaser shall be reported to the manufacturer within producer, and specified in the order, the markings shall be
30 working days from the receipt of samples or test reports by painted or stenciled on the fitting or stamped on a metal or
the purchaser. plastic tag which shall be securely attached to the fitting.
14.2 Each fitting that develops surface discontinuities 17.2 Bar Coding—In addition to the requirements in 17.1,
deeper than 5 % of the specified nominal wall thickness in shop bar coding is acceptable as a supplemental identification
working or application operations may be rejected and the method. The purchaser may specify in the order a specific bar
manufacturer so notified. coding system to be used. The bar coding system, if applied at
the discretion of the supplier, should be consistent with one of
15. Rehearing the published industry standards for bar coding. If used on
15.1 Test samples that represent fittings rejected by the small fittings, the bar code may be applied to the box or a
purchaser shall be preserved for four weeks from the date of substantially applied tag.

6
 A815/A815M − 21
18. Keywords
18.1 corrosive service applications; ferritic/austenitic stain-
less steel; ferritic stainless steel; martensitic stainless steel;
pipe fittings-steel; piping applications; pressure containing
parts; stainless steel fittings

SUPPLEMENTARY REQUIREMENTS

One or more of the supplementary requirements described below may be included in the purchaser’s
inquiry or in the order or contract. When so included, a supplementary requirement shall have the
same force as if it were in the body of the specification. Supplementary requirement details not fully
described shall be agreed upon between the purchaser and the supplier.

S1. Product Analysis (Note S1.1) S3. Intergranular Corrosion Bend Test (Note S1.1)
S1.1 A product analysis shall be made for each heat of base S3.1 An intergranular corrosion bend test shall be made on
metal and, if of welded construction, from each lot number of one fitting or representative test piece (Note S2.1) per lot (Note
welding material of the fittings offered for delivery and shall S2.2) of fittings. If the fittings are of welded construction, the
conform to the requirements specified in Section 7. bend specimen shall include the weld and be prepared so that
the weld is at the midlength location of the specimen. Speci-
NOTE S1.1—If the results of any of the tests specified in Supplementary
Requirements S1, S2, or S3 do not conform to requirements, retests may
mens containing a weld shall be bent so that the location of
be made at the manufacturer’s expense on additional fittings or represen- weld is at the point of maximum bend. The method of testing
tative test pieces of double the original number from the same heat or lot shall be in accordance with Practices A262 or Practices A763,
as defined in Supplementary Requirements S1, S2, or S3, each of which as applicable.
shall conform to the requirements specified.
S4. Ultrasonic Test
S2. Tension Test (Note S1.1) S4.1 Each fitting or the raw material from which each fitting
S2.1 One tension test shall be made on one fitting or is made shall be ultrasonically tested to determine its sound-
representative test piece (Note S2.1) per lot (Note S2.2) of ness. The method, where applicable, shall be in accordance
fittings. If the fittings are of welded construction, the tension with Practice A388/A388M. Acceptance limits shall be speci-
specimen shall include the weld and be prepared so that the fied by the purchaser.
weld is at the midlength of the specimen. S5. Photomicrographs
NOTE S2.1—Where the test specimen for the tension or intergranular S5.1 Photomicrographs at 100 diameters shall be made for
corrosion bend test cannot be taken from a fitting due to size limitations,
information only of the actual base metal structure from one
a representative test piece shall be obtained. The test piece shall be from
the same lot it represents and shall have approximately the same amount fitting as furnished in each lot. The photomicrographs shall be
of working. In addition, these pieces representing fittings manufactured identified as to fitting size, wall thickness, lot identification,
from bars, plate, or forgings shall have a cross section equal to the greatest and heat. The definition of “lot” shall be as specified by the
cross section of the fitting, and test pieces representing fittings manufac- purchaser.
tured from tubular products shall have a cross section approximately the
same as that of the finished product. The test piece for fittings of welded S6. Surface Finish
construction shall be prepared to the same weld procedures and from the S6.1 Machined surfaces shall have a maximum roughness
same heats of materials as the fittings it represents.
of 250 RMS (root-mean-square) or 6.3 µin. AA (arithmetical
NOTE S2.2—A lot shall consist of all fittings of the same type, size, and
average). All other surfaces shall be suitable for ultrasonic
wall thickness, manufactured from one heat of material (and, if fabrication
welding is performed using one lot number of electrode or one heat of testing.
weld wire), and heat treated using the same heat treat cycle in either a S7. Liquid Penetrant Test
continuous or batch-type furnace controlled within a range of 50 °F [28
°C] and equipped with recording pyrometers so that complete records of S7.1 All surfaces shall be liquid penetrant tested. The
heat treatment are available. method shall be in accordance with Practice E165/E165M.

7
 A815/A815M − 21
SUMMARY OF CHANGES

Committee A01 has identified the location of selected changes to this standard since the last issue
(A815/A815M – 20) that may impact the use of this standard. (Approved Nov. 1, 2021.)

(1) Revised 7.2 allowing AWS ER2594 weld filler for UNS
S32750 and S32760 pipe.

ASTM International takes no position respecting the validity of any patent rights asserted in connection with any item mentioned
in this standard. Users of this standard are expressly advised that determination of the validity of any such patent rights, and the risk
of infringement of such rights, are entirely their own responsibility.

This standard is subject to revision at any time by the responsible technical committee and must be reviewed every five years and
if not revised, either reapproved or withdrawn. Your comments are invited either for revision of this standard or for additional standards
and should be addressed to ASTM International Headquarters. Your comments will receive careful consideration at a meeting of the
responsible technical committee, which you may attend. If you feel that your comments have not received a fair hearing you should
make your views known to the ASTM Committee on Standards, at the address shown below.

This standard is copyrighted by ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959,
United States. Individual reprints (single or multiple copies) of this standard may be obtained by contacting ASTM at the above
address or at 610-832-9585 (phone), 610-832-9555 (fax), or service@astm.org (e-mail); or through the ASTM website
(www.astm.org). Permission rights to photocopy the standard may also be secured from the Copyright Clearance Center, 222
Rosewood Drive, Danvers, MA 01923, Tel: (978) 646-2600; http://www.copyright.com/