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Home Material GB /T 9943-2025
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Grade W6Mo5Cr4V2
China ISC T33390
Corresponding Standard GB /T 9943-2025
High-Speed Tool Steels
Classification Tool Steel
W6Mo5Cr4V2 Chemical Element Composition Content (%)
Component C Si ① Mn P S ② Cr Mo W V
Minimum Value 0.8 0.2 0.15 - - 3.8 4.5 5.5 1.75
Maximum Value 0.9 0.45 0.4 0.03 0.02 4.4 5.5 6.75 2.2
① There is no lower limit specified for the silicon content in electroslag remelted steel.
② Upon the purchaser’s request, special sulfur content requirements may be specified in the contract to improve the machinability of the steel.
W6Mo5Cr4V2 Mechanical Properties
Heat Treatment or Condition
Hardness
HBW
Delivery condition Annealing ① ≤255
test specimen Preheating temperature: 800–900 °C，Quenching temperature: 1200–1220 °C (salt bath furnace) or 1210–1230 °C (box furnace or vacuum furnace)，Quenching medium: oil, salt bath, or nitrogen gas，Tempering temperature: 550 °C ② HRC ≥64 ③
① The hardness in the annealed and cold-drawn condition is permitted to be up to 50 HBW higher than that in the annealed condition.
② Tempering shall be carried out three times: 1 hour each time in a salt bath, and 2 hours each time in a box furnace or vacuum furnace.
③ The quenched and tempered hardness of the test specimens may be exempt from inspection if the supplier can guarantee it.
New and Old Grade Replacement List
Corresponding Standard Grade
GB /T 9943-2008
Grade
China ISC
GB /T 9943-2025
Grade
China ISC
1 Approximate Comparison Table High-Speed Tool Steels
China Japan United States International Organization for Standardization Germany France European Standard Russia Sweden United Kingdom
GB JIS ASTM ISO DIN EN/DIN NF EN/NF EN Numerical Grade GOST SS BS EN/BS
W6Mo5Cr4V2 SKH51 M2 HS6-5-2 HS6-5-2 Z85WDCV06-05-04-02 HS6-5-2 1.3339 R6M5
Р6М5 		2722 BM2
2 Approximate Comparison Table High-Speed Tool Steels
China Japan South Korea United States International Organization for Standardization Germany United Kingdom
GB JIS KS ASTM ISO DIN EN/DIN BS EN/BS
W6Mo5Cr4V2 SKH9
(SKH51) 		SKH9 M2 HS6-5-2 S6-5-2 BM2
3 Approximate Comparison Table High-Speed Steel 1
China Japan United States International Organization for Standardization Germany France Russia United Kingdom
GB JIS ASTM ISO DIN EN/DIN W-Nr. NF EN/NF GOST BS EN/BS
W6Mo5Cr4V2 SK H51 M2(一般含碳量) HS6-5-2 S6-5-2 1.3343 Z85WDCV06-05-04-02 Р6М3 BM2
4 Approximate Comparison Table High-Speed Steel 2
China Taiwan, China Japan South Korea United States International Organization for Standardization Germany France Russia Sweden United Kingdom
GB ISC CNS JIS KS ASTM UNS ISO DIN EN/DIN W-Nr. NF EN/NF GOST SS14 BS EN/BS
W6Mo5Cr4V2 T66541 SKH 51 SKH 51 SKH 51 M2(正常C) T11302 HS 6-5-2 S 6-5-2 1.3339 HS 6-5-2 Р6М5 2722 HS 6-5-2
BM2
5 Approximate Comparison Table High-Speed Steel 4
China Japan South Korea United States Germany France European Standard Russia Sweden United Kingdom
GB JIS KS ASTM UNS DIN EN/DIN NF EN/NF EN Numerical Grade GOST SS BS EN/BS
W6Mo5Cr4V2 SKH51 SKH51 M2 T11302 HS6-5-2
S6-5-2
S6-5-2S
SC6-5-2
X82WMoCrV6-5-4 		HS6-5-2
HS6-5-2HC
X85WMoCrV6-5-4
Z85WDCV 		HS6-5-2
HS6-5-2C 		1.3339
1.3343 		Р6М5
R6M5 		2722 3343
BM2
W6Mo5Cr4V2 Corresponding Standards(Same grade name, different standards)
1 GB /T 1299-2014
W6Mo5Cr4V2 T21830
2 GB /T 9943-2008
W6Mo5Cr4V2 T66541
3 YB /T 084-2016
W6Mo5Cr4V2
4 GB /T 3080-2001
W6Mo5Cr4V2 T66541
5 JB /T 7715-1995
W6Mo5Cr4V2
6 GB 9943-1988
W6Mo5Cr4V2
7 GB /T 9943-2025
W6Mo5Cr4V2 T33390
8 GB /T 1299-2025
W6Mo5Cr4V2 T33390

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