ASTM B668-23

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: B668 − 23
Standard Specification for
Iron-Nickel-Chromium-Molybdenum Alloy Seamless Pipe
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and Tube
This standard is issued under the fixed designation B668; 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* 4. Ordering Information
1.1 This specification covers UNS N08028 and N08029 4.1 It is the responsibility of the purchaser to specify all
seamless cold-finished or hot-finished pipe and tube intended requirements that are necessary for the safe and satisfactory
for general corrosive service. performance of material ordered under this specification.
Examples of such requirements include, but are not limited to,
1.2 The values stated in inch-pound units are to be regarded
the following:
as standard. The values given in parentheses are mathematical
4.1.1 Alloy name or UNS number,
conversions to SI units that are provided for information only
4.1.2 ASTM designation and year of issue,
and are not considered standard.
4.1.3 Dimensions:
1.3 This standard does not purport to address all of the
4.1.3.1 Outside diameter, minimum or average wall thick-
safety concerns, if any, associated with its use. It is the
ness (in inches or millimetres, not gauge number), and length,
responsibility of the user of this standard to establish appro-
4.1.3.2 Standard pipe size, schedule and length,
priate safety, health, and environmental practices and deter-
4.1.4 Quantity (feet or metres, or number of pieces),
mine the applicability of regulatory limitations prior to use.
4.1.5 Optional requirements,
1.4 This international standard was developed in accor-
4.1.6 Samples for Product (Check) Analysis—State whether
dance with internationally recognized principles on standard-
samples for product (check) analysis should be furnished, and
ization established in the Decision on Principles for the
4.1.7 Purchaser Inspection—If the purchaser wishes to
Development of International Standards, Guides and Recom-
witness tests or inspection of material at the place of
mendations issued by the World Trade Organization Technical
manufacture, the purchase order must so state, indicating
Barriers to Trade (TBT) Committee.
which tests or inspections are to be witnessed.
2. Referenced Documents
5. Materials and Manufacture
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2.1 ASTM Standards:
5.1 Material furnished under this specification shall con-
B829 Specification for General Requirements for Nickel and
form to the applicable requirements of Specification B829 un-
Nickel Alloys Seamless Pipe and Tube
less otherwise provided herein.
B899 Terminology Relating to Non-ferrous Metals and Al-
5.2 Pipe and tube shall be furnished in the solution-annealed
loys
condition.
3. Terminology
NOTE 1—The recommended heat treatment for UNS N08028 shall
consist of heating the material to a temperature of 1975 °F to 2100 °F
3.1 Definitions:
(1080 °C to 1150 °C) with subsequent quenching in water or rapidly
3.1.1 For definitions of terms used in this specification,
cooling by other means. The recommended heat treatment for UNS
refer to Terminology B899.
N08029 shall consist of heating the material to a minimum temperature of
2000 °F (1100 °C) with subsequent quenching in water or rapidly cooling
by other means.
5.3 The scale shall be removed by suitable means. When
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This specification is under the jurisdiction of ASTM Committee B02 on
Nonferrous Metals and Alloys and is the direct responsibility of Subcommittee bright annealed, scale removal operations are not necessary.
B02.07 on Refined Nickel and Cobalt and Their Alloys.
Current edition approved Nov. 1, 2023. Published November 2023. Originally
6. Chemical Composition
approved in 1980. Last previous edition approved in 2019 as B668 – 14 (2019).
DOI: 10.1520/B0668-23.
6.1 The material shall conform to the requirement pre-
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For referenced ASTM standards, visit the ASTM website, www.astm.org, or
scribed in Table 1.
contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
6.1.1 A chemical analysis shall be made on each lot of
Standards volume information, refer to the standard’s Document Summary page on
the ASTM website. material as described in Specification B829.
*A Summary of Changes section appears at the end of this standard
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B668 − 23
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TABLE 1 Chemical Requirements TABLE 2 Tensile Requirements
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