ASTM B387/B387M-23

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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
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.
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
B387/B387M − 23
2. Referenced Documents
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 under this specification shall include the following information as applicable:
4.1.1 Material number and temper designation (Section 1 and Table 3),
4.1.2 Product form (Section 3),
4.1.3 Chemical requirements (Table 1 and Table 2),
4.1.4 Metallurgical condition (Section 7),
4.1.5 Mechanical requirements (Section 8),
4.1.6 Thermal stability (Section 9),
TABLE 1 Chemical Requirements
Composition, %
Element Material Number
360 361 363 364 365 366
C 0.030 max 0.010 max 0.010–0.040 0.010–0.040 0.010 max 0.030 max
O, max 0.0020 0.0070 0.0030 0.050 0.0020 0.0025
N, max 0.0020 0.0020 0.0020 0.0020 0.0020 0.0020
Fe, max 0.010 0.010 0.010 0.010 0.010 0.010
Ni, max 0.0020 0.005 0.0020 0.005 0.0020 0.002
Si, max 0.010 0.010 0.010 0.010 0.010 0.010
Ti . . 0.40–0.55 0.40–0.55 . .
W . . . . . 27–33
Zr . . 0.06–0.12 0.06–0.12 . .
Mo balance balance balance balance balance balance
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volume information, refer to the standard’s Document Summary page on the ASTM website.
B387/B387M − 23
TABLE 2 Permissible Variations in Check Analysis
Check Analysis Permissible
Limits, max or Variations in
Material No.
range, % Check Analysis,
%
C 361, 365 0.010 +0.002
360, 366 0.030 +0.005
363,364 0.010–0.040 ±0.005
O 360, 365 0.0020 +10 % relative
366 0.0025 +10 % relative
363 0.0030 +10 % relative
361 0.0070 +10 % relative
364 0.050 +10 % relative
N 360, 361, 363, 364, 365, 366 0.0020 +0.0005
Fe 360, 361, 363, 364, 365, 366 0.010 +0.001
Ni 360, 363, 365, 366 0.002 +10 % relative
361, 364 0.005 +10 % relative
Si 360, 361, 363, 364, 365, 366 0.010 +0.002
Ti 363, 364 0.40–0.55 ±0.05
W 366 27.0–33.0 ±1.0
Zr 363, 364 0.06–0.12 ±0.02
4.1.7 Tolerances (Section 10 and Section 11 and Table 4),
4.1.8 Workmanship and quality level requirements (Section 12),
4.1.9 Disposition of rejected material (Section 14),
4.1.10 Certification and reports (Section 15),
4.1.11 Marking (Section 16), and
4.1.12 Packaging (Section 17).
5. Materials and Manufacture
5.1 The various molybdenum mill products covered by this specification shall be manufactured with the conventional extrusion,
forging, swaging, rolling, and drawing equipment normally found in primary ferrous and nonferrous plants. The ingot metal for
Molybdenum 360 and 365 and Molybdenum Alloys 363 and 366 is vacuum arc-melted in furnaces of a type suitable for reactive,
refractory metals. For Molybdenum 361 and 364 the metal is consolidated by powder metallurgy methods.
6. Chemical Composition
6.1 The molybdenum and molybdenum alloy ingots and billets for conversion to finished products covered by this specification
shall conform to the requirements of the chemical composition prescribed in Table 1.
6.2 Heat Analysis:
6.2.1 Heat analysis is made by the manufacturer of the metal on a representative sample of powder from a single powder blend
in the case of material made from pressed and sintered powder billets, or on a representative sample of a cast ingot or intermediate
product from that ingot in the case of material made from cast ingot.
6.2.2 Heat analysis shall be as specified in Table 1.
B387/B387M − 23
A
TABLE 3 Mechanical Requirements for Round Bars and Rods
Tensile Yield Elongation Diamond Pyr-
Strength, Strength, in 1 in. amid Hard-
B D
Type Temper Diameter, in. (mm)[mm] min, ksi 0.2 % Offset, (50 mm)[50 ness (DPH),
-10 kg,
(MPa)[MPa] min, ksi mm]
Vickers-10 kg
(MPa)[MPa] min, %
C
360, 361, 365 SR 0.020 to 0.125 (0.51 to 3.18), incl 85 (585) 65 (450) 15 .
C
360, 361, 365 SR 0.020 to 0.125 [0.51 to 3.18], incl 85 [585] 65 [450] 15 .
over 0.125 to 0.406 (3.18 to 10.32) 75 (515) 55 (380) 15 .
over 0.125 to 0.406 [3.18 to 10.32] 75 [515] 55 [380] 15 .
over 0.406 to 0.875 (10.32 to 22.2) 90 (620) 75 (515) 18 210 to 280
over 0.406 to 0.875 [10.32 to 22.2] 90 [620] 75 [515] 18 210 to 280
over 0.875 to 1.125 (22.2 to 28.6) 85 (585) 70 (480) 15 210 to 270
over 0.875 to 1.125 [22.2 to 28.6] 85 [585] 70 [480] 15 210 to 270
over 1.125 to 1.875 (28.6 to 47.6) 75 (515) 65 (450) 10 210 to 260
over 1.125 to 1.875 [28.6 to 47.6] 75 [515] 65 [450] 10 210 to 260
over 1.875 to 2.875 (47.6 to 73.0) 70 (480) 60 (415) 10 210 to 250
over 1.875 to 2.875 [47.6 to 73.0] 70 [480] 60 [415] 10 210 to 250
over 2.875 to 3.500 (73.0 to 88.9) 65 (450) 55 (380) 10 205 to 240
over 2.875 to 3.500 [73.0 to 88.9] 65 [450] 55 [380] 10 205 to 240
over 3.500 to 6.50 [88.9 to 165] 65 [450] 55 [380] 5 180 to 240
363, 364 SR 0.188 to 0.875 (4.76 to 22.2), incl 115 (790) 100 (690) 18 260 to 320
363, 364 SR 0.188 to 0.875 [4.76 to 22.2], incl 115 [790] 100 [690] 18 260 to 320
over 0.875 to 1.125 (22.2 to 28.6) 110 (760) 95 (655) 15 250 to 310
over 0.875 to 1.125 [22.2 to 28.6] 110 [760] 95 [655] 15 250 to 310
over 1.125 to 1.875 (28.6 to 47.6) 100 (690) 85 (585) 10 245 to 300
over 1.125 to 1.875 [28.6 to 47.6] 100 [690] 85 [585] 10 245 to 300
over 1.875 to 2.875 (47.6 to 73.0) 90 (620) 80 (550) 10 240 to 290
over 1.875 to 2.875 [47.6 to 73.0] 90 [620] 80 [550] 10 240 to 290
over 2.875 to 3.500 (73.0 to 88.9) 85 (585) 75 (515) 5 235 to 285
over 2.875 to 3.500 [73.0 to 88.9] 85 [585] 75 [515] 5 235 to 285
over 3.500 to 6.50 [88.9 to 165] 85 [585] 75 [515] 5 220 to 285
366 SR 0.188 to 0.875 (4.76 to 22.2), incl 95 (655) 80 (550) 2 240 to 300
366 SR 0.188 to 0.875 [4.76 to 22.2], incl 95 [655] 80 [550] 2 240 to 300
over 0.875 to 1.125 (22.2 to 28.6) 90 (620) 75 (515) 2 235 to 300
over 0.875 to 1.125 [22.2 to 28.6] 90 [620] 75 [515] 2 235 to 300
over 1.125 to 1.875 (28.6 to 47.6) 85 (585) 70 (480) 2 230 to 290
over 1.125 to 1.875 [28.6 to 47.6] 85 [585] 70 [480] 2 230 to 290
over 1.875 to 2.875 (47.6 to 73.0) 80 (550) 65 (450) 2 230 to 290
over 1.875 to 2.875 [47.6 to 73.0] 80 [550] 65 [450] 2 230 to 290
over 2.875 to 3.500 (73.0 to 88.9) 75 (515) 60 (415) 2 225 to 290
over 2.875 to 3.500 [73.0 to 88.9] 75 [515] 60 [415] 2 225 to 290
over 3.500 to 6.50 [88.9 to 165] 75 [515] 60 [415] 2 225 to 290
360 RX Under 2 (50.8) 60 (415) 35 (240) 20 200 max
2 to 3.500 (50.8 to 88.9) 55 (380) 25 (170) 20 200 max
360 RX Under 2 [50.8] 60 [415] 35 [240] 20 200 max
2 to 6.50 [50.8 to 165] 55 [380] 25 [170] 20 200 max
363, 364 RX Under 2 (50.8) 80 (550) 55 (380) 20 215 max
2 to 3.500 (50.8 to 88.9) 75 (515) 45 (310) 10 215 max
363, 364 RX Under 2 [50.8] 80 [550] 55 [380] 20 215 max
2 to 6.50 [50.8 to 165] 75 [515] 45 [310] 10 215 max
A
Mechanical properties of all bars, and rods other than round, shall be as agreed upon between the manufacturer and the purchaser.
B
SR = stress-relieved; RX = essentially fully recrystallized.
C
The gagegauge length is 10 in. (254 mm)[254 mm] for rods 0.0200.020 in. to 0.125 in. (0.51[0.51 min to 3.18 min)min] in diameter only. All other elongation values are
for 1-in. (25-mm) gage[25-mm] gauge lengths.
D
In the case where the test sample thickness cannot support 10-kg load without causing “anvil effects,” a lighter load may be used, but must be reported with the hardness
results.
6.2.3 The m
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