ASTM B621-95a

Standard Specification for Nickel-Iron-Chromium-Molybdenum Alloy (UNS N08320) Rod

SCOPE
1.1 This specification  covers nickel-iron chromium-molybdenum alloy (UNS N08320)* rod for use in general corrosive service.  
1.2 The following products are covered under this specification:  
1.2.1 Rods 5/16 to 3/4 in. (7.94 to 19.05 mm) excl in diameter, hot or cold finished, solution annealed and pickled or mechanically descaled.  
1.2.2 Rods 3/4 to 3 1/2 in. (19.05 to 88.9 mm) incl in diameter, hot or cold finished, solution annealed, ground or turned.  
1.3 The values stated in inch-pound units are to be regarded as the standard. The values given in parentheses are for information only.

General Information

• Status: Historical
• Publication Date: 31-Dec-1994
• ICS: 77.150.40 - Nickel and chromium products
• Technical Committee: B02 - Nonferrous Metals and Alloys
• Drafting Committee: B02.07 - Refined Nickel and Cobalt and Their Alloys

Relations

• Replaced By: ASTM B621-02 - Standard Specification for Nickel-Iron-Chromium-Molybdenum Alloy (UNS N08320) Rod
• Effective Date: 10-Oct-2002

Standards Content (Sample)

NOTICE: This standard has either been superseded and replaced by a new version or discontinued.
Contact ASTM International (www.astm.org) for the latest information.
Designation: B 621 – 95a
Standard Specification for
Nickel-Iron-Chromium-Molybdenum Alloy (UNS N08320)
Rod
This standard is issued under the fixed designation B 621; 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 performance of material ordered under this specification.
Examples of such requirements include but are not limited to
1.1 This specification covers nickel-iron chromium-
*
the following:
molybdenum alloy (UNS N08320) rod for use in general
4.1.1 Dimensions—Nominal diameter and length. The
corrosive service.
shortest useable multiple length shall be specified (Table 1).
1.2 The following products are covered under this specifi-
4.1.2 Certification—State if certification or a report of test
cation:
results is required (Section 15).
5 3
1.2.1 Rods ⁄16to ⁄4 in. (7.94 to 19.05 mm) excl in diameter,
4.1.3 Purchaser Inspection—State which tests or inspec-
hot or cold finished, solution annealed and pickled or mechani-
tions are to be witnessed (Section 13).
cally descaled.
3 1 4.1.4 Samples for Product (Check) Analysis—State
1.2.2 Rods ⁄4to 3 ⁄2 in. (19.05 to 88.9 mm) incl in diameter,
whether samples shall be furnished (9.2.2).
hot or cold finished, solution annealed, ground or turned.
1.3 The values stated in inch-pound units are to be regarded
5. Chemical Composition
as the standard. The values given in parentheses are for
5.1 The material shall conform to the composition limits
information only.
specified in Table 2.
2. Referenced Documents 5.2 If a product (check) analysis is made by the purchaser,
the material shall conform to the requirements specified in
2.1 ASTM Standards:
Table 2 subject to the permissible tolerances in Table 3.
E 8 Test Methods for Tension Testing of Metallic Materials
E 29 Practice for Using Significant Digits in Test Data to
6. Mechnical Properties and Other Requirements
Determine Conformance with Specifications
6.1 The mechanical properties of the material at room
E 1473 Test Methods for Chemical Analysis of Nickel,
temperature shall conform to those shown in Table 4.
Cobalt, and High-Temperature Alloys
7. Dimensions, Mass and Permissible Variations
3. Terminology
7.1 Diameter—The permissible variations from the speci-
3.1 Definitions of Terms Specific to This Standard:
fied diameter shall be as prescribed in Table 5.
3.1.1 rod—a product of round solid section furnished in
7.2 Out of Roundness—The permissible variation in round-
straight lengths.
ness shall be as prescribed in Table 5.
4. Ordering Information 7.3 Matching Allowances—When the surfaces of finished
material are to be machined, the following allowances are
4.1 It is the responsibility of the purchaser to specify all
suggested for normal machining operations:
requirements that are necessary for the safe and satisfactory
7.3.1 As-finished (Annealed and Descaled)—For diameters
5 11 1
of ⁄16to ⁄16 in. (7.94 to 17.46 mm) incl, an allowance of ⁄16 in.
This specification is under the jurisdiction of ASTM Committee B-2 on
(1.59 mm) on the diameter should be made for finish machin-
Nonferrous Metals and Alloys and is the direct responsibility of Subcommittee
ing.
B02.07 on Refined Nickel and Cobalt, and Alloys Containing Nickel or Cobalt, or
Both, as Principal Constituents.
7.4 Length:
For ASME Boiler and Pressure Vessel Code applications see related Specifi-
7.4.1 Unless multiple, nominal, or cut lengths are specified,
cation SB-621 in Section II of that Code.
random mill lengths shall be furnished.
* New designation established in accordance with ASTM E527 and SAE J1086,
7.4.2 The permissible variations in length of multiple,
Recommended Practice for Numbering Metals and Alloys (UNS).
Current edition approved Oct. 10, 1995. Published December 1995. Originally
nominal, or cut length rod shall be as prescribed in Table 1.
published as B621 – 77. Last previous edition B621 – 95.
Where rods are ordered in multiple lengths, an additional ⁄4 in.
Annual Book of ASTM Standards, Vol 03.01.
Annual Book of ASTM Standards, Vol 14.02.
Annual Book of ASTM Standards, Vol 03.06.
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NOTICE: This standard has either been superseded and replaced by a new version or discontinued.
Contact ASTM International (www.astm.org) for the latest information.
B 621
TABLE 1 Permissible Variations in Length of Rods
8. Workmanship, Finish, and Appearance
Random mill lengths 2 to 12 ft (610 to 3660 mm) long
8.1 The material shall be uniform in quality and condition,
with not more than 25 weight % under
smooth, and free of injurious imperfections.
4 ft (1.22 m).
Multiple lengths Furnished in multiples of a
9. Sampling
specified unit length, within the
length limits indicated above.
9.1 Lots for Chemical Analysis and Mechanical Testing:
For each multiple, an allowance of ⁄4 in. (6.35
9.1.1 A lot for chemical analysis shall consist of one heat.
mm) shall be made for cutting, unless 9.1.2 A lot of bar for mechanical testing shall be defined as
otherwise specified. At the
the material from one heat in the same condition and specified
manufacturer’s option, individual
diameter.
specified unit lengths may be furnished.
Nominal lengths Specified nominal lengths having
9.2 Sampling for Chemical Analysis:
a range of not less than 2 ft (610
9.2.1 A representative sample shall be obtained from each
mm) with no short lengths allowed.
heat during pouring or subsequent processing.
Cut lengths A specified length to which all
rods shall be cut with a permissible
9.2.2 Product (check) analysis shall be wholly the respon-
variation of + ⁄8 in. (3.17 mm) - 0.
sibility of the purchaser.
9.3 Sampling for Mechanical Testing:
9.3.1 A representative sample shall be taken from each lot of
TABLE 2 Chemical Requirements
finished material.
Element Composition Limits,%
10. Number of Tests and Retests
Nickel 25.0–27.0
A
Iron remainder
10.1 Chemical Analysis—One test per heat.
Chromium 21.0–23.0
10.2 Tension Tests—One test per lot.
Molybdenum 4.0–6.0
10.3 Retests—If the specimen used in the mechanical test of
Manganese, max 2.
...