ASTM B474-99

NOTICE: This standard has either been superceded and replaced by a new version or discontinued.
Contact ASTM International (www.astm.org) for the latest information.
Designation: B 474 – 99
Standard Specification for
Electric Fusion Welded UNS N08020, UNS N08024, and UNS
N08026 Nickel Alloy Pipe
This standard is issued under the fixed designation B 474; 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 (e) indicates an editorial change since the last revision or reapproval.
1. Scope Steel Covered Welding Electrodes
A5.9 Corrosion-Resisting Chromium and Chromium Nickel
1.1 This specification covers electric fusion welded UNS
Steel Welding Rods and Bare Electrodes
N08020, UNS N08026, and UNS N08024* pipe suitable for
A5.11 Nickel and Nickel Alloy Covered Welded Elec-
high-temperature or corrosive service. (Although no restric-
trodes
tions are placed on the sizes of pipe that may be furnished
A5.14 Nickel and Nickel Alloy Bare Welding Rods and
under this specification, commercial practice is commonly
Electrodes
limited to sizes not less than 8 in. (203 mm) nominal diameter.)
1.2 Two types of pipe are covered as follows:
3. Ordering Information
1.2.1 Type I—All welded joints to be completely examined
3.1 It is the responsibility of the purchaser to specify all
by radiography.
requirements that are necessary for the safe and satisfactory
1.2.2 Type II—No radiographic examination required.
performance of material ordered under this specification.
1.3 The values stated in inch-pound units are to be regarded
Examples of such requirements include, but are not limited to,
as the standard. The values given in parentheses are for
the following:
information only.
3.1.1 Quantity (feet or number of lengths),
2. Referenced Documents 3.1.2 Name of material or UNS number,
3.1.3 Type (1.2),
2.1 ASTM Standards:
3.1.4 Size (outside diameter and minimum wall thickness),
A 370 Test Methods and Definitions for Mechanical Testing
3.1.5 Length (specific or random),
of Steel Products
3.1.6 ASTM designation and year of issue,
B 463 Specification for UNS N08020, UNS N08026, and
3.1.7 Authorization for repair of plate defects by welding
UNS N08024 Alloy Plate, Sheet, and Strip
without prior approval if such is intended (see 8.4),
E 8 Test Methods for Tension Testing of Metallic Materials
3.1.8 Circumferential weld permissibility (see 7.3.2), and
E 29 Practice for Using Significant Digits in Test Data to
3.1.9 Supplementary requirements.
Determine Conformance with Specifications
E 1473 Test Method for Chemical Analysis of Nickel,
4. Materials and Manufacture
Cobalt, and High Temperature Alloys
4.1 Materials—The plate material shall conform to the
2.2 American Society of Mechanical Engineers Standard:
7 requirements of Specification B 463.
ASME Boiler and Pressure Vessel Code, Section IX
4.2 Manufacture:
2.3 American Welding Society Standards:
4.2.1 The joints shall be double-welded, full-penetration
A5.4 Corrosion-Resisting Chromium and Chromium Nickel
welds made in accordance with procedures and by operators
qualified in accordance with the ASME Boiler and Pressure
This specification is under the jurisdiction of ASTM Committee B-2 on
Vessel Code, Section IX.
Nonferrous Metals and Alloys and is the direct responsibility of Subcommittee
4.2.2 The welds shall be made either manually or automati-
B02.07 on Refined Nickel and Cobalt and Their Alloys.
Current edition approved May 10, 1999. Published June 1999. Originally
cally by an electric process involving the deposition of filler
published as B 474 – 68. Last previous edition B 474 – 94.
metal.
* New designation established in accordance with ASTM E 527 and SAE J 1086,
4.2.3 The weld surface on either side of the weld shall be
Practice for Numbering Metals and Alloys (UNS).
Annual Book of ASTM Standards, Vol 01.03. flush with the base plate or shall have a reasonably uniform
Annual Book of ASTM Standards, Vol 02.04. 1
crown, not to exceed ⁄8 in. (3.2 mm). Any weld reinforcement
Annual Book of ASTM Standards, Vol 03.01.
may be removed at the manufacturer’s option or by agreement
Annual Book of ASTM Standards, Vol 14.02.
Annual Book of ASTM Standards, Vol 03.06.
Available from the American Society of Mechanical Engineers, 345 E. 47th St.,
New York, NY 10017.
Available from the American Welding Society, 2501 N.W. Seventh St., Miami,
FL 33125.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.
NOTICE: This standard has either been superceded and replaced by a new version or discontinued.
Contact ASTM International (www.astm.org) for the latest information.
B 474
between the manufacturer and purchaser. The contour of the direction are present in the weld metal or between the weld and
reinforcement shall be reasonably smooth and free of irregu- the pipe metal after bending. Cracks that originate along the
larities. The deposited metal shall be fused uniformly into the edges of the specimen during testing, and that are less than
plate surface. No concavity of contour is permitted unless the ⁄4in. (6.3 mm) measured in any direction shall not be consid-
resulting thickness of weld metal is equal to or greater than the ered.
minimum thickness of the adjacent base metal. 6.3 Pressure Test— Any pipe that shows leaks during the
4.2.4 Weld defects shall be repaired by removal to sound pressure test conducted in accordance with 12.4 shall be
metal and rewelding. Subsequent heat treatment and inspection rejected but any leaking areas may be cut out and the pipe
shall be as required on the original welds. retested as above.
4.3 Heat Treatment— The product of UNS N08020 alloy 6.4 Radiographic Examination—Type I welded joints shall
shall be furnished in the stabilized-annealed condition. The be completely examined by radiography.
product of UNS N08026 alloy shall be furnished in the
7. Dimensions and Permissible Variations
solution-annealed condition. The product of UNS N08024
7.1 Permissible variations in dimensions at any point in a
alloy shall be furnished in the annealed condition.
length of pipe shall not exceed the following:
NOTE 1—The recommended annealing temperatures all followed by
7.1.1 Outside Diameter— Based on circumferential mea-
quenching in water or rapidly cooling by other means are as follows: 1700
surement, 60.5 % of the nominal outside diameter.
to 1850°F (927 to 1010°C) for UNS N08020, 2050 to 2200°F (1121 to
7.1.2 Out-of-Roundness— Differences between major and
1204°C) for UNS N08026, and 1925 to 1975°F (1052 to 1079°C) for UNS
minor outside diameters, 1.0 % of the specified outside diam-
N08024.
eter.
5. Chemical Composition
7.1.3 Alignment (Camber)—Using a 10-ft (3-m) straight-
edge placed so that both ends are in contact with the pipe, the
5.1 The chemical composition of the pipe shall conform to
camber shall not be more than ⁄8 in. (3.17 mm).
the requirements in Table 1 of Specification B 463.
7.2 Thickness—The minimum wall thickness at any point in
5.2 For UNS N08020 pipe, the alloy content of the depos-
the pipe shall not be more than 0.01 in. (0.25 mm) under the
ited weld metal shall conform to that required for the plate or
nominal thickness.
the welding electrodes as shown in Specification AWS A5.4 for
7.3 Lengths:
E-320, or E-320LR and in Specification AWS 5.9 for ER-320
7.3.1 The lengths required shall be specified in the orders.
or ER-320LR. For UNS N08026, the alloy content of the
7.3.2 Circumferentially welded joints of the same quality as
deposited weld metal shall conform to that required for the
the longitudinal joints shall be permitted by agreement between
plate or the welding electrodes as shown in Specification AWS
the manufacturer and the purchaser.
A5.11 for E-Ni-Cr-Mo-3 and in Specification AWS 5.14 for
Er-Cr-Ni-Mo-3. For UNS N08024, the alloy content of the
8. Workmanship, Finish, and Appearance
deposited weld metal shall conform to that required for the
8.1 Pipe shall be furnished with smooth ends, free of burrs.
plate.
8.2 The finished pipe shall be free of injurious defects and
5.3 If product analysis is made of the plate or weld metal by
shall have a workmanlike finish.
the purchaser, the chemical composition thus determined shall
8.3 Repair of Plate Defects by Machining or Grinding—
conform to the requirements specified in 5.1 and 5.2 subject to
Pipe showing moderate slivers may be machined or ground
the permissible tolerances in Table 2 of Specification B 463.
inside or outside to a depth that shall ensure the removal of all
included scale and slivers, provided the wall thickness is not
6. Mechanical and Other Properties
reduced below the specified minimum wall thickness. Machin-
6.1 Mechanical Properties:
ing or grinding shall follow inspection of the pipe as rolled and
6.1.1 The mechanical properties of the plate shall be in
shall be followed by supplementary visual inspection.
accordance with Table 1. Tension tests made by the plate
8.4 Repair of Plate Defects by Welding—Repair of injurious
manufacturer shall qualify the plate material.
defects shall be permitted only with the approval of the
6.1.2 Transverse tension tests taken across the welded joint
purchaser. Defects shall be thoroughly chipped out before
shall have the same minimum ultimate tensile strength as the
welding. The repairs shall be radiographed and if the pipe itself
specified minimum ultimate tensile strength of the plate.
has already been heat treated, it shall then be heat treated again
6.2 Transverse Guided Weld Bend Test Requirements—
except in the cas
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