ASTM B387/B387M-23

Standard Specification for Molybdenum and Molybdenum Alloy Bar, Rod, and Wire

ABSTRACT
This specification covers unalloyed molybdenum and molybdenum alloy bar, rod, and wire. The following materials are covered: molybdenum 360, molybdenum 361, molybdenum 363, molybdenum 364, molybdenum 365, and molybdenum 366. These materials shall be manufactured with conventional extrusion, forging, swaging, rolling, and drawing equipment. These shall materials be made by vacuum arc-melted or powder metallurgy methods. The chemical composition shall conform to the required contents of carbon, oxygen, nitrogen, iron, nickel, silicon, titanium, tungsten, zirconium, and molybdenum. Chemical analysis shall be done. Mechanical properties shall conform to the required tension properties: tensile strength, yield strength, elongation, and diamond pyramid hardness. Tension test shall also be done.
SCOPE
1.1 This specification covers unalloyed molybdenum and molybdenum alloy bar, rod, and wire as follows:  
1.1.1 Molybdenum 360—Unalloyed vacuum arc-cast molybdenum.  
1.1.2 Molybdenum 361—Unalloyed powder metallurgy molybdenum.  
1.1.3 Molybdenum Alloy 363—Vacuum arc-cast molybdenum–0.5 % titanium–0.1 % zirconium (TZM) alloy.  
1.1.4 Molybdenum Alloy 364—Powder metallurgy molybdenum–0.5 % titanium–0.1 % zirconium (TZM) alloy.  
1.1.5 Molybdenum 365—Unalloyed vacuum arc-cast molybdenum, low carbon.  
1.1.6 Molybdenum Alloy 366—Vacuum arc-cast molybdenum, 30 % tungsten alloy.  
1.2 This specification covers wire no smaller than 0.020 in. [0.51 mm] in diameter or of equivalent cross-sectional area. Specification F289 covers diameters up to 0.020 in. [0.51 mm].  
1.3 The values stated in either SI units or inch-pound units are to be regarded separately as standard. The values stated in each system are not necessarily exact equivalents; therefore, to ensure conformance with the standard, each system shall be used independently of the other, and values from the two systems shall not be combined.  
1.4 The following precautionary caveat pertains only to the test method portions of this specification: This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety, health, and environmental practices and determine the applicability of regulatory limitations prior to use.  
1.5 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.

General Information

• Status: Published
• Publication Date: 31-Dec-2022
• ICS: 77.150.99 - Other products of non-ferrous metals
• Technical Committee: B10 - Reactive and Refractory Metals and Alloys
• Drafting Committee: B10.04 - Molybdenum and Tungsten

Standards Content (Sample)

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: B387/B387M − 23
Standard Specification for
1
Molybdenum and Molybdenum Alloy Bar, Rod, and Wire
This standard is issued under the fixed designation B387/B387M; 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* 2. Referenced Documents
2
1.1 This specification covers unalloyed molybdenum and 2.1 ASTM Standards:
molybdenum alloy bar, rod, and wire as follows: E8 Test Methods for Tension Testing of Metallic Materials
1.1.1 Molybdenum 360—Unalloyed vacuum arc-cast mo- [Metric] E0008_E0008M
lybdenum. E29 Practice for Using Significant Digits in Test Data to
1.1.2 Molybdenum 361—Unalloyed powder metallurgy mo- Determine Conformance with Specifications
lybdenum. F289 Specification for Molybdenum Wire and Rod for
1.1.3 Molybdenum Alloy 363—Vacuum arc-cast molybde- Electronic Applications
num–0.5 % titanium–0.1 % zirconium (TZM) alloy.
3. Terminology
1.1.4 Molybdenum Alloy 364—Powder metallurgy molyb-
denum–0.5 % titanium–0.1 % zirconium (TZM) alloy.
3.1 Definitions of Terms Specific to This Standard:
1.1.5 Molybdenum 365—Unalloyed vacuum arc-cast
3.1.1 bar and rod, n—any straight product with a round,
molybdenum, low carbon.
rectangular, hexagonal, or octagonal solid cross section, 6.5 in.
1.1.6 Molybdenum Alloy 366—Vacuum arc-cast
[165 mm] in diameter or less, or of equivalent cross-sectional
molybdenum, 30 % tungsten alloy.
area.
1.2 This specification covers wire no smaller than 0.020 in. 3.1.2 wire, n—any product furnished in coils or on spools or
[0.51 mm] in diameter or of equivalent cross-sectional area. reels.
Specification F289 covers diameters up to 0.020 in. [0.51 mm].
3.2 Lot Definition:
1.3 The values stated in either SI units or inch-pound units 3.2.1 for chemical composition, n—the product of a single
are to be regarded separately as standard. The values stated in blend of powder or a single vacuum melted ingot.
each system are not necessarily exact equivalents; therefore, to
3.2.2 for mechanical property measurement, n—the product
ensure conformance with the standard, each system shall be
manufactured from ingots sintered from either a single powder
used independently of the other, and values from the two
lot in a single sintering run in the same furnace or a single
systems shall not be combined.
ingot, processed through the same processing equipment in a
1.4 The following precautionary caveat pertains only to the
single uninterrupted run, using the same thermomechanical
test method portions of this specification: This standard does process to reach the same final size.
not purport to address all of the safety concerns, if any,
4. Ordering Information
associated with its use. It is the responsibility of the user of this
standard to establish appropriate safety, health, and environ-
4.1 Orders for material under this specification shall include
mental practices and determine the applicability of regulatory
the following information as applicable:
limitations prior to use.
4.1.1 Material number and temper designation (Section 1
1.5 This international standard was developed in accor-
and Table 3),
dance with internationally recognized principles on standard-
4.1.2 Product form (Section 3),
ization established in the Decision on Principles for the
4.1.3 Chemical requirements (Table 1 and Table 2),
Development of International Standards, Guides and Recom-
4.1.4 Metallurgical condition (Section 7),
mendations issued by the World Trade Organization Technical
4.1.5 Mechanical requirements (Section 8),
Barriers to Trade (TBT) Committee.
4.1.6 Thermal stability (Section 9),
4.1.7 Tolerances (Section 10 and Section 11 and Table 4),
1
This specification is under the jurisdiction of ASTM Committee B10 on
Reactive and Refractory Metals and Alloys and is the direct responsibility of
2
Subcommittee B10.04 on Molybdenum and Tungsten. For referenced ASTM standards, visit the ASTM website, www.astm.org, or
Current edition approved Jan. 1, 2023. Published February 2023. Originally contact ASTM Customer Service at [e-mail]. For Annual Book of ASTM
approved in 1962. Last previous edition approved in 2018 as B387 – 18. DOI: Standards volume information, refer to the standard’s Document Summary page on
10.1520/B0387_B0387M-23. the ASTM website.
*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

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This document is not an ASTM standard and is intended only to provide the user of an ASTM standard an indication of what changes have been made to the previous version. Because
it may not be technically possible to adequately depict all changes accurately, ASTM recommends that users consult prior editions as appropriate. In all cases only the current version
of the standard as published by ASTM is to be considered the official document.
Designation: B387 − 18 B387/B387M − 23
Standard Specification for
1
Molybdenum and Molybdenum Alloy Bar, Rod, and Wire
This standard is issued under the fixed designation B387;B387/B387M; 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*
1.1 This specification covers unalloyed molybdenum and molybdenum alloy bar, rod, and wire as follows:
1.1.1 Molybdenum 360—Unalloyed vacuum arc-cast molybdenum.
1.1.2 Molybdenum 361—Unalloyed powder metallurgy molybdenum.
1.1.3 Molybdenum Alloy 363—Vacuum arc-cast molybdenum–0.5 % titanium–0.1 % zirconium (TZM) alloy.
1.1.4 Molybdenum Alloy 364—Powder metallurgy molybdenum–0.5 % titanium–0.1 % zirconium (TZM) alloy.
1.1.5 Molybdenum 365—Unalloyed vacuum arc-cast molybdenum, low carbon.
1.1.6 Molybdenum Alloy 366—Vacuum arc-cast molybdenum, 30 % tungsten alloy.
1.2 This specification covers wire no smaller than 0.020 in. (0.51 mm)[0.51 mm] in diameter or of equivalent cross-sectional area.
Specification F289 covers diameters up to 0.020 in. (0.51 mm).[0.51 mm].
1.3 The values stated in either SI units or inch-pound units are to be regarded separately as standard. The values given in
parentheses are mathematical conversions to SI units that are provided for information only and are not considered standard.stated
in each system are not necessarily exact equivalents; therefore, to ensure conformance with the standard, each system shall be used
independently of the other, and values from the two systems shall not be combined.
1.4 The following precautionary caveat pertains only to the test method portions of this specification: This standard does not
purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to
establish appropriate safety, health, and environmental practices and determine the applicability of regulatory limitations prior
to use.
1.5 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.
1
This specification is under the jurisdiction of ASTM Committee B10 on Reactive and Refractory Metals and Alloys and is the direct responsibility of Subcommittee
B10.04 on Molybdenum and Tungsten.
Current edition approved July 1, 2018Jan. 1, 2023. Published September 2018February 2023. Originally approved in 1962. Last previous edition approved in 20102018
as B387 – 10. DOI: 10.1520/B0387-18.18. DOI: 10.1520/B0387_B0387M-23.
*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

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B387/B387M − 23
2. Referenced Documents
2
2.1 ASTM Standards:
E8 Test Methods for Tension Testing of Metallic Materials [Metric] E0008_E0008M
E29 Practice for Using Significant Digits in Test Data to Determine Conformance with Specifications
E92 Test Methods for Vickers Hardness and Knoop Hardness of Metallic Materials
E384 Test Method for Microindentation Hardness of Materials
E1941 Test Method for Determination of Carbon in Refractory and Reactive Metals and Their Alloys by Combustion Analysis
F289 Specification for Molybdenum Wire and Rod for Electronic Applications
3. Terminology
3.1 Definitions of Terms Specific to This Standard:
3.1.1 bar and rod, n—any straight product with a round, rectangular, hexagonal, or octagonal solid cross section, 4 in. (101.6 mm)
6.5 in. [165 mm] in diameter or less, or of equivalent cross-sectional area.
3.1.2 wire, n—any product furnished in coils or on spools or reels.
3.2 Lot Definition:
3.2.1 for chemical composition, n—the product of a single blend of powder or a single vacuum melted ingot.
3.2.2 for mechanical property measurement, n—the product manufactured from ingots sintered from either a single powder lot in
a single sintering run in the same furnace or a single ingot, processed through the same processing equipment in a single
uninterrupted run, using the same thermomechanical process to reach the same final size.
4. Ordering Information
4.1 Orders for material u
...