About ASTM B387 Type 361

ASTM B387 Type 361 is the unalloyed powder metallurgy molybdenum, which has good strength, as well as corrosion resistance. The advanced powder metallurgy techniques were used to produce Molybdenum 361 which guarantees consistency and uniformity of quality, mechanical properties, and high performance in high temperature conditions. It has an outstanding mechanical integrity at extreme temperatures, it has excellent resistance to chemical corrosion, and the thermal expansion is low, thereby providing dimensional stability.

ASTM B387 Type 361 molybdenum has a melting point of about 2,623 °C (4,753 °F) and is suitable in vacuum furnaces, heating elements, aerospace parts, high temperature laboratory facilities, research and development, machining, and precision tooling. All Molybdenum 361 rods and bars are lot-controlled and stress-relieved high high-temperature pressed and sintered, and each shipment is accompanied by a material certificate to ascertain traceability and compliance with international procedures. ASTM B387 Type 361 is the material of choice when industries need strength, stability and performance that can be relied upon even in the most extreme conditions, available in standard length of 1 meter and custom sizes available on request.

Leading Manufacturer & Supplier of ASTM B387 Type 361 Rods & Bars

Lakshya Steel is a world-renowned manufacturer and reliable supplier of ASTM B387 Type 361 rods and ASTM B387 Type 361 bars and has an extensive stock of standard sizes, not to mention the custom dimensions and lengths. Lakshya Steel will be devoted to the ISO-certified quality standards and strictly controlled processes and strict quality assurance as every order of Molybdenum 361 will be provided as per the international standards.

Manufacturing Process of ASTM B387 Type 361 Bars & Rods

The process of manufacturing ASTM B387 Type 361 bars and rods requires a number of procedures to ensure uniform quality, strength, and reliability. Molybdenum 361 billets are large and are heated and rolled or extruded to the required sizes. These are used to obtain good strength, smooth surfaces and correct dimensions. The inspection of the bars and the rods is particularly done during production to locate any defects that may influence the performance especially in the context of high temperature or corrosion conditions. Further forging and finishing enhance the strength, hardness and corrosion resistance of the material, so that Molybdneum 361 is robust enough to handle the demanding requirements of the aerospace and other high-performance industries.

There are also strict process and temperature regulations throughout. This assists in more retained natural properties of Molybdenum 361, producing ASTM B387 Type 361 rods and bars that are able to perform effectively even in harsh environments.

Technical Specifications of ASTM B387 Type 361 Rods

Specification Value
Standard ASTM B387 Molybdenum and Molybdenum Alloy Bar, Rod, and Wire
Grade Molybdenum 360, Molybdenum 361, Molybdenum Alloy 363, Molybdenum Alloy 364, Molybdenum 365, Molybdenum Alloy 366
Condition & Finish Furnished in the wrought and stress-relieved condition; Black, chemical cleaned
Type Bar, Rod, Wire
Bar and Rod Any straight product with a round, rectangular, hexagonal, or octagonal solid cross-section, 4 in. (101.6 mm) in diameter or less, or of equivalent cross-sectional area.
Wire Any product furnished in coils or on spools or reels. This specification covers wire no smaller than 0.020 in. (0.51mm) in diameter or equivalent cross-sectional area.
Specification F289 covers diameters up to 0.020 in.
Inspection Certificate EN 10204 Type 3.1 (Mill Test Certificate), EN 10204 Type 3.2 (Witness Testing or 3rd Party Inspection)
Test Tensile Test

Chemical Composition (wt.%) of ASTM B387 Alloy Bars

C O, maxA N, maxA Fe, max Ni, max Si, max Mo
0.010 max 0.0070 0.002 0.010 0.005 0.010 balance

ASTM B387 Bars and Rods Mechanical Properties

TemperB Diameter, in (mm) Tensile Strength, min
ksi (Mpa)
Yield Strength, 0.2 %
Offset, min, ksi [Mpa]
Elongation in 1 in.
(50 mm) min, %
Diamond Pyramid Hardness
Vickers-10 kg
SR 0.020 to 1/8 (0.51 to 3.18), incl 85 (585) 65 (450) 15C
over 1/8 to 1 3/32 (3.18 to 10.32) 75 (515) 55 (380) 15
over 1 3/32 to 7/8 (10.32 to 222) 90 (620) 75 (515) 18 230 to 280
over 7/8 to 1 1/8 (22.2 to 28.6) 85 (585) 70 (480) 15 225 to 270
over 1 1/8 to 1 7/8 (28.6 to 47.6) 75 (515) 65 (450) 10 215 to 260
over 1 7/8 to 2 7/8 (47.6 to 73.0) 70 (480) 60 (415) 10 210 to 250
over 2 7/8 to 3 1/2 (73.0 to 88.9) 65 (450) 55 (380) 10 205 to 240
XR Under 2 (50.8) 60 (415) 35 (240) 20 200 max
2 to 3 1/2 (50.8 to 88.9) 55 (380) 25 (170) 20 200 max

ASTM B387 Rod Stock Sizes Chart

0.00157″ Dia x spool 0.020″ Dia x spool 0.3125″ Dia x 72″ Lg
0.002″ Dia x spool 0.030″ Dia x coil 0.375″ Dia x 72″ Lg
0.0024″ Dia x spool 0.040″ Dia x coil 0.625″ Dia x 72″ Lg
0.00315″ Dia x spool 0.040″ Dia x 72″ Lg 0.750″ Dia x 72″ Lg
0.0035″ Dia x spool 0.050″ Dia x coil 1″ Dia x 72″ Lg
0.004″ Dia x spool 0.060″ Dia x coil 1.125″ Dia x 72″ Lg
0.005″ Dia x spool 0.062″ Dia x 72″ Lg 1.250″ Dia x 72″ Lg
0.006″ Dia x spool 0.070″ Dia x coil 1.500″ Dia x 72″ Lg
0.007″ Dia x spool 0.080″ Dia x coil 1.750″ Dia x 36″ Lg
0.008″ Dia x spool 0.093″ Dia x coil 2″ Dia x 36″ Lg
0.009″ Dia x spool 2.9mm Dia x coil 2.250″ Dia x 24″ Lg
0.010″ Dia x spool 2.9mm Dia x 36″ Lg 2.500″ Dia x 24″ Lg
0.012″ Dia x spool 0.125″ Dia x 72″ Lg 2.750″ Dia x 24″ Lg
0.015″ Dia x spool 0.188″ Dia x 72″ Lg 3″ Dia x 24″ Lg
0.5mm Dia x spool 0.250″ Dia x 72″ Lg

Other Equipment Grades of ASTM B387 Rods & Bars

  • Molybdenum 360—Unalloyed vacuum arc-cast molybdenum.
  • Molybdenum Alloy 363—Vacuum arc-cast molybdenum–0.5 % titanium–0.1 % zirconium (TZM) alloy.
  • Molybdenum Alloy 364—Powder metallurgy molybdenum–0.5 % titanium–0.1 % zirconium (TZM) alloy.
  • Molybdenum 365—Unalloyed vacuum arc-cast molybdenum, low carbon.
  • Molybdenum Alloy 366—Vacuum arc-cast molybdenum, 30 % tungsten alloy.

Frequently Asked Questions on ASTM B387 Type 361 Rods & Bars

What is Molybdenum 361?
Molybdenum 361 is an unalloyed type of powder metallurgy molybdenum grade produced as per ASTM B387 Type 361. It is characterized by high melting point, superior strength, corrosion resistance, and dimensional stability, which makes it applicable in the high-temperature and the demanding industrial applications.
What is Molybdenum 361 used for?

 Molybdenum 361 is widely used in high-temperature and corrosive environments, such as:

  • Aerospace components and propulsion systems
  • Vacuum furnaces and heating elements
  • Semiconductor equipment
  • Research and precision tooling applications 

It is chosen wherever high strength, low thermal expansion, and chemical resistance are critical.

What is the ASTM B387 equivalent to?

ASTM B387 specifies molybdenum and molybdenum alloy rods, bars, and wire. The closest ASTM material equivalents include:

  • ASTM B386 for molybdenum and TZM alloys
  • Sometimes compared with ASTM A387 in applications requiring high-temperature strength and corrosion resistance, though ASTM A387 is generally for steel alloys.
What is ASTM A387 material?
ASTM A387 is a standard specification for pressure vessel and boiler steel plates, often made from alloy or carbon steel with chromium and molybdenum additions. It is used in high-temperature pressure vessels, boilers, and heat exchangers, offering good high-temperature strength and corrosion resistance.
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