SPECIFICATION FOR UNS N08367 AND UNS N08926
WELDED PIPE
SB-804
(Identical with ASTM Specification B 804-93 except that the following additional requirements
apply.)
All products furnished under the SB specification are intended for application under the rules of
Section III of the ASME Boiler and Pressure Vessel Code. Manufacture of such products is limited
to manufacturers who hold the appropriate ASME Certificate of Authorization and Code Symbol
Stamp. In addition to conforming to this specification, the manufacturer shall meet all applicable
requirements of Section III of the Code. The plate used to fabricate the pipe shall conform to SB-
688. The joints shall be full penetration butt welds as obtained by double welding or by other
means, which will obtain the same quality of deposited and weld metal on the inside and outside.
Welds using metal backing strips which remain in place are excluded. The product is subject to all
requirements of Section III of the Code including welding, heat treatment, nondestructive examina-
tion, authorized inspection at the point of manufacture, and application of the Code Symbol Stamp.
The applicable ASME Partial Data Report Form signed by an Authorized Inspector and a certified
mill test report shall be furnished for each lot of pipe. The term “lot” applies to all pipe of the
same mill heat of material and wall thickness which is heat treated in one furnace charge. For pipe
that is not heat treated, or that is heat treated in a continuous furnace, a lot shall consist of each
200 ft (61 m) or fraction thereof of all pipe of the same mill heat material and wall thickness
subjected to the same heat treatment. For pipe that is heat treated in a batch-type furnace that is
automatically controlled within a 50°F range and is equipped with recording pyrometers so that
the heating records are available, a lot may be defined the same as for continuous furnaces. Each
length of pipe shall be marked in such a maneer as to identify each such piece with the lot and the
certified mill test report.
1. Scope 1.2.2 Class 2 pipe shall be double welded by
processes employing filler metal in all passes. No
1.1 This specification covers UNS N08367 and UNS
radiography is required.
N08926 welded pipe for general corrosion applications.
(Although no restrictions are placed on the sizes of
pipe that may be furnished under this specification, 1.2.3 Class 3 pipe shall be double welded by
commercial practice is commonly limited to sizes no processes employing filler metal in all passes except
less than 8 in. nominal diameter.) the inside root weld may be made without the addition
of filler metal. Welds are to be completely radiographed.
1.2 Six classes of pipe are covered as follows:
1.2.4 Class 4 pipe shall be double welded by
1.2.1 Class 1 pipe shall be double welded by processes employing filler metal in all passes except
processes employing filler metal in all passes and shall the inside root weld may be made without the addition
be completely radiographed. of filler metal. No radiography is required.
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SB-804 1998 SECTION II
1.2.5 Class 5 pipe shall be single welded by Section IX Qualification Standard for Welding and Braz-
processes employing filler metal in all passes except ing Procedures, Welders, Brazers, and Welding and
that the pass exposed to the inside pipe surface may Brazing Operators
be made without the addition of filler metal. Welds
2.3 American Welding Society Standards:
are to be completely radiographed.
AWS A5.11 Nickel and Nickel Alloy Covered Welded
1.2.6 Class 6 pipe shall be single welded by Electrodes
processes employing filler metal in all passes except AWS A5.14 Nickel and Nickel Alloy Bare Welding Rods
that the pass exposed to the inside pipe surface may and Electrodes
be made without the addition of filler metal. No radiogra-
phy is required.
3. Ordering Information
1.3 The values stated in inch-pound units are to be
regarded as the standard. The values given in parentheses 3.1 Orders for material under this specification shall
are for information only. include the following information:
3.1.1 Quantity (feet or number of lengths),
1.4 The following safety hazards caveat pertains only
to the test method portion, Section 12, of this standard: 3.1.2 Class (see 1.2),
This standard does not purport to address all of the
safety problems, if any, associated with its use. It is 3.1.3 Size (outside diameter and minimum wall
the responsibility of the user of this standard to establish thickness),
appropriate safety and health practices and determine 3.1.4 Length (specific or random),
the applicability of regulatory limitations prior to use.
3.1.5 ASTM specification number,
3.1.6 Authorization for repair of plate defects by
welding without prior approval if such is intended
2. Referenced Documents
(see 8.4),
2.1 ASTM Standards:
3.1.7 Circumferential weld permissibility (see
A 262 Practices for Detecting Susceptibility to Intergran-
7.3.2), and
ular Attack in Austenitic Stainless Steels
A 370 Test Methods and Definitions for Mechanical Test- 3.1.8 Supplementary requirements.
ing of Steel Products
B 625 Specification for UNS N08904, UNS N08925,
UNS N08031, UNS N08932, and UNS N08926 Plate, 4. Materials and Manufacture
Sheet, and Strip
B 688 Specification for Chromium-Nickel-Molybdenum- 4.1 Materials — The starting material shall conform
Iron (UNS N08366 and UNS N08367) Plate, Sheet, to the requirements of Specification B 688 for UNS
and Strip N08367 and Specification B 625 for UNS N08926.
E 8 Test Methods for Tension Testing of Metallic Mate- 4.2 Manufacture:
rials
E 29 Practice for Using Significant Digits in Test Data 4.2.1 The joints shall be double or single welded,
to Determine Conformance With Specifications full penetration welds made in accordance with ASME
E 38 Methods for Chemical Analysis of Nickel-Chro- Boiler and Pressure Vessel Code, Section IX.
mium and Nickel-Chromium-Iron Alloys 4.2.2 The welds shall be made either manually
E 354 Test Methods for Chemical Analysis of High- or automatically by an electric process involving the
Temperature, Electrical, Magnetic, and Other Similar deposition of filler metal according to the class specified.
Iron, Nickel, and Cobalt Alloys
E 1019 Test Methods for Determination of Carbon, Sul- 4.2.3 The weld surface on either side of the weld
fur, Nitrogen, Oxygen, and Hydrogen in Steel and in shall be flush with the base plate or shall have a
Iron, Nickel, and Cobalt Alloys reasonably uniform crown, not to exceed 1⁄8 in. (3.2
mm). Any weld reinforcement may be removed at the
2.2 ASME Boiler and Pressure Vessel Code: manufacturer’s option or by agreement between the
Section VIII, Division 1 Rules for Construction of Pres- manufacturer and purchaser. The contour of the rein-
sure Vessels forcement shall be reasonably smooth and free of
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PART B — NONFERROUS MATERIAL SPECIFICATIONS SB-804
irregularities. The deposited metal shall be fused uni- TABLE 1
formly into the plate surface. No concavity of contour MECHANICAL PROPERTY REQUIREMENTS
is permitted unless the resulting thickness of weld metal
is equal to or greater than the minimum thickness of Yield
Tensile Strength,
the adjacent base metal. Strength, [Note (1)] Elongation
min. min. in 2 in. or
4.2.4 Weld defects shall be repaired by removal 50.8 mm,
to sound metal and rewelding. Subsequent heat treatment ksi MPa ksi MPa min., %
and inspection shall be as required on the original
UNS N0 8367 95 655 45 310 30
welds. UNS N0 8926 94 650 43 295 35
4.3 Heat Treatment — The recommended heat treat- NOTE:
ment shall consist of heating to a minimum temperature (1) Yield strength shall be determined by the offset method at 0.2%
limiting permanent set in accordance with Test Methods E 8. An
of 2025°F for UNS N08367 and 2012°F for UNS alternative method of determining yield strength may be based
N08926 followed by quenching in water or rapidly on a total extension under load of 0.5%.
cooling by other means.
5. Chemical Composition 6.2 Transverse Guided Weld Bend Test Require-
5.1 The chemical composition of the pipe shall ments — Bends made in accordance with Fig. 1 shall
conform to the requirements in Table 1 of Specification be acceptable if no cracks or other imperfections ex-
B 688 for UNS N08367 and Table 1 of Specification ceeding 1⁄8 in. (3.2 mm) in any direction are present
B 625 for UNS N08926. in the weld metal or between the weld and the pipe
metal after bending. Cracks that originate along the
5.2 The alloy content of the deposited weld metal edges of the specimen during testing, and that are less
shall conform to that required for the plate or the than 1⁄4 in. (6.3 mm) measured in any direction, shall
welding electrodes as shown in Specification AWS 5.11 not be considered.
for ENiCrMo-3, ENiCrMo-4, and ENiCrMo-10 or AWS
5.14 for ERNiCrMo-10, ERNiCrMo-3, and ER- 6.3 Pressure Test — Any pipe that shows laeks
NiCrMo-4. during the pressure test conducted in accordance with
12.4 shall be rejected, but any leaking areas may be
5.3 If product analysis is made of the plate or weld cut out and the pipe retested as above.
metal by the purchaser, the chemical composition thus
determined shall conform to the requirements specified 6.4 Radiographic Examination— For Classes 1, 3,
in 5.1 and 5.2 subejct to the permissible tolerances in and 5 pipe, radiographic examination shall be in accord-
Table 1 of Specification B 688 for UNS N08367 and ance with the requirements of the ASME Boiler and
specified in 5.1 and 5.2 subject to the permissible Pressure Vessel Code, Section VIII, latest edition, Para-
tolerances in Table 2 of Specification B 625 for UNS graph UW-51.
N08926.
7. Dimensions, Mass, and Permissible
Variations
6. Mechanical Properties and Other
Requirements 7.1 Permissible variations in dimensions at any point
in a length of pipe shall not exceed the following:
6.1 Mechanical Properties:
7.1.1 Outside Diameter — Based on circumferential
6.1.1 The mechanical properties of the plate shall
measurement, 60.5% of the nominal outside diameter.
be in accordance with Table 1. Tension tests made by
the plate manufacturer shall qualify the plate material. 7.1.2 Out-of-Roundness — Differences between
major and minor outside diameters, 1.0% of the specified
6.1.2 Transverse tension tests taken across the outside diameter.
welded joint shall have the same minimum ultimate
tensile strength as the specified minimum ultimate 7.1.3 Alignment (Camber) — Using a 10-ft (3-m)
tensile strength of the plate. straightedge placed so that both ends are in contact
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SB-804 1998 SECTION II
with the pipe, the camber shall not be more than 1⁄8 9.1.2 Mechanical Testing — A lot shall consist
in. (3.17 mm). of the material of the same nominal size from one
heat and condition.
7.2 Thickness — The minimum wall thickness at
any point in the pipe shall not be more than 0.01 in. 9.2 Sampling for Chemical Analysis:
(0.25 mm) under the nominal thickness. 9.2.1 A representative sample shall be taken by
7.3 Lengths: the plate manufacturer during pouring or subsequent
processing.
7.3.1 The lengths required shall be specified in
9.2.2 Product analysis, if performed, shall be
the orders.
wholly the responsibility of the purchaser.
7.3.2 Circumferentially welded joints of the same
9.3 Sampling for Mechanical Properties — Transverse
quality as the longitudinal joints shall be permitted by
tension and bend test specimens shall be cut after final
agreement between the manufacturer and the purchaser.
heat treatment from the end of the finished pipe or
from a test plate of the same material as the pipe that
is attached to the end of the cylinder and welded as
8. Workmanship, Finish, and Appearance a prolongation of the longitudinal pipe seam.
8.1 Pipe shall be furnished with smooth ends, free
of burrs. 10. Number of Tests and Retests
8.2 The finished pipe shall be free of injurious defects 10.1 Chemical Analysis — One test per lot.
and shall have a workmanlike finish.
10.2 Transverse Tension Test — One per lot.
8.3 Repair of Plate Defects by Machining or Grind-
10.3 Transverse Guided Weld Bend Test — One face
ing —Pipe showing moderate slivers may be machined
bend and one root bend per lot (Fig. 2).
or ground inside or outside to a depth that shall ensure
the removal of all included scale and slivers, provided 10.4 Pressure Test — Each pipe shall be subjected
the wall thickness is not reduced below the specified to the pressure test.
minimum wall thickness. Machining or grinding shall
10.5 Retests:
follow inspection of the pipe as rolled and shall be
followed by supplementary visual inspection. 10.5.1 If the results of any mechanical tests of pipe
material of any lot do not conform to the requirements
8.4 Repair of Plate Defects by Welding — Repair specified in Section 6, retest shall be made on double
of injurious defects shall be permitted only with the the original number from the same lot, each of which
approval of the purchaser. Defects shall be thoroughly shall conform to the requirements specified.
chipped out before welding. The repairs shall be radio-
graphed and if the pipe itself has already been heat 10.5.2 If the results of any mechanical tests of
treated, it shall then be heat treated again except in any lot do not conform to the requirements specified,
the case of small welds that, in the estimation of the such lot may be reworked and resubmitted. The same
purchaser’s inspector, do not require heat treatment. number of tests as originally specified shall be required
Each length of pipe required in this manner shall be on reworked and resubmitted pipe.
hydrostatically tested after being repaired.
8.5 The pipe shall be sandblasted or pickled to 11. Specimen Preparation
remove all scale and then passivated.
11.1 The test specimens required by this specification
shall conform to those described in Test Methods and
Definitions A 370.
9. Sampling
11.2 The transverse tension and bend test specimens
9.1 Lots for Chemical Analysis and Mechanical shall be flattened cold before final machining to size
Testing: if flattening is required.
9.1.1 Heat Analysis — A lot shall consist of 11.3 Tension and bend test specimens shall be the
one heat. full thickness of the material as rolled and shall be
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PART B — NONFERROUS MATERIAL SPECIFICATIONS SB-804
FIG. 1 GUIDED-BEND TEST JIG
FIG. 2 TRANSVERSE FACE- AND ROOT-BEND TEST SPECIMEN
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SB-804 1998 SECTION II
FIG. 3 REDUCED-SECTION TENSION TEST SPECIMEN
FIG. 4 ALTERNATIVE REDUCED-SECTION TENSION TEST SPECIMEN
machined to the form and dimensions shown in Figs. shall be determined, in case of disagreement, in accord-
2, 3, and 4. ance with the following ASTM methods:
11.4 If any test specimen shows flaws or defective
machining, it may be discarded and another specimen 12.1.1 Chemical Analysis — Methods E 38 and
substituted. Test Methods E 354. Iron shall be determined arithmeti-
cally by difference. Methods E 38 is to be used only
for elements not covered by Test Methods E 354. Use
12. Test Methods Test Methods E 1019 for Nitrogen.
12.1 The chemical composition and mechanical prop-
erties of the material as enumerated in this specification 12.1.2 Tension Test — Test Methods E 8.
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PART B — NONFERROUS MATERIAL SPECIFICATIONS SB-804
12.2 For the purposes of determining compliance 13. Inspection
with the limits in this specification, an observed value
13.1 Inspection of the material shall be agreed upon
or a calculated value shall be rounded as indicated, in
between the the purchaser and the supplier as part of
accordance with the rounding method of Practice E 29:
the purchase contract.
Rounded Unit for Observed
Requirements or Calculated Value
Chemical composition and tol- Nearest unit in the last right-
14. Rejection and Rehearing
erances hand place of figures of the 14.1 Material that fails to meet the requirements of
specified limit
Tensile strength and yield Nearest 1000 psi (6.9 MPa)
this specification may be rejected Rejection shall be
strength reported to the producer or supplier promptly and in
Elongation Nearest 1% writing. In case of dissatisfaction with the results of
the test, the producer or supplier may make claim for
a rehearing.
12.3 Tension Test — If the percent of elongation of
any test specimen is less than that specified and any
part of the fracture is more than 3⁄4 in. (19.05 mm)
from the center of the gage length, as indicated by 15. Certification
scribe marks on the specimen before testing, or if a 15.1 When specified on the purchase order or contract,
specimen breaks due to a flaw, a retest shall be allowed. a producer’s or supplier’s certification shall be furnished
to the purchaser that the material was manufactured,
12.4 Hydrostatic Test — When pipe is hydrostatically
sampled, tested, and inspected in accordance with this
tested, such testing shall be done at a pressure deter-
specification and has been found to meet the require-
mined by the following equation, but shall not exceed
ments. When specified on the order or contract, a report
2500 psi (17 MPa) for nominal sizes 3 in. and under,
of test results shall be furnished.
or 2800 psi (19 MPa) for all nominal sizes over 3 in.
P p 2St/D
or 16. Marking
S p PD/2t 16.1 The name or brand of the manufacturer, the
where: grade of the material from which the pipe is made,
Pp hydrostatic test pressure, psi (MPa), the ASTM specification, type number, and heat number
Sp allowable fiber stress or 20,000 psi (138 MPa), shall be legibly stenciled within 12 in. (305 mm) of
tp specified wall thickness, in. or mm, and one end on each pipe.
Dp specified outside diameter, in. or mm
16.2 The marking paint or ink shall not contain
12.4.1 The test pressure shall be held for a mini- metal or metal salts in such amounts as would cause
mum of 5 s. corrosive attack on heating.
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SB-804 1998 SECTION II
SUPPLEMENTARY REQUIREMENT
The following supplementary requirement shall be applied only when specified by
the purchaser in the inquiry, contract, or order.
S1. Intergranular Corrosion Test
S1.1 When specified, material shall pass intergranular
corrosion tests conducted by the manufacturer in accord-
ance with Practices A 262, Practice E. Specimens shall
be sensitized for 1 h at 1250°F (677°C) before being
subjected to the corrosion test.
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