Gb W6mo5cr4v2 Standard M2 Grade Chemical Composition And Equivalence - China

GB W6Mo5Cr4V2 is the Chinese national standard designation for the world's most widely used tungsten-molybdenum high speed steel, recognized internationally as AISI M2, DIN 1.3343 and JIS SKH51 - Understanding the GB standard helps buyers match Chinese mill certificates with American, European and Japanese specifications without confusion.

GB Standard System Background:

- GB/T 9943 is the Chinese standard covering high speed tool steel bars

- W6Mo5Cr4V2 naming logic: W (tungsten) 6%, Mo (molybdenum) 5%, Cr (chromium) 4%, V (vanadium) 2%

- The grade sits in the W-Mo HSS family, which offers better toughness than the older W18Cr4V (T1) type International Equivalence Table:

- China GB: W6Mo5Cr4V2

- USA AISI/ASTM: M2

- Germany DIN: 1.3343 (S 6-5-2)

- Japan JIS: SKH51 / SKH9

- France AFNOR: Z85WDCV

- UK BS: BM2 Chemical Composition per GB/T 9943:

Carbon: 0.80-0.90%, Silicon: 0.20-0.45%, Manganese: 0.15-0.40%, Chromium: 3.80-4.40%, Molybdenum: 4.50-5.50%, Tungsten: 5.50-6.75%, Vanadium: 1.75-2.20%, Phosphorus max 0.030%, Sulfur max 0.030% Key Technical Data:

- Annealed hardness: max 255 HB

- Hardening temperature: 1200-1230C

- Tempering: 540-560C triple temper

- Working hardness: HRC 62-65

- Red hardness maintained at approximately 600C Buyer Tips for GB W6Mo5Cr4V2:

1 - Always request EN 10204 3.1 mill certificates and check W, Mo, V contents against the GB range.

2 - Confirm melting process: EAF+LF+VD refined material gives cleaner, more uniform quality.

3 - For critical tools, ask for ultrasonic test reports per SEP 1921.

4 - Verify annealed hardness before machining to avoid tooling cost surprises.

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Company Contact:

• Posted By: Dongguan Songshun Mould Steel Co., Ltd.

• Phone: 0086 0769 85475596

• Address: 1st Floor, No. 1, Dongda Fourth Street, Shatou Community, Chang'an Town, Dongguan , GuangDong , China

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• Business Description: Established in 2009,Songshun Steel supplies a wide range of carbon, alloy and tool steel products, including high speed tool steel, cold work tool steel, hot work tool steel, plastic mould steel, engineering steel and machine structural steel etc.
  
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