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Home Material GB /T 9943-2025
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Grade W6Mo5Cr4V2Co5
China ISC T32430
Corresponding Standard GB /T 9943-2025
High-Speed Tool Steels
Classification Tool Steel
Properties High-Temperature Resistance
W6Mo5Cr4V2Co5 Chemical Element Composition Content (%)
Component C Si ① Mn P S ② Cr Mo W V Co
Minimum Value 0.87 0.2 0.15 - - 3.8 4.7 5.9 1.7 4.5
Maximum Value 0.95 0.45 0.4 0.03 0.02 4.5 5.2 6.7 2.1 5
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.
W6Mo5Cr4V2Co5 Mechanical Properties
Heat Treatment or Condition
Hardness
HBW
Delivery condition Annealing ① ≤269
test specimen Preheating temperature: 800–900 °C，Quenching temperature: 1190–1210 °C (salt bath furnace) or 1200–1220 °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 Steel 3
China Japan International Organization for Standardization Germany France European Standard Russia Sweden United Kingdom
GB JIS ISO DIN EN/DIN NF EN/NF EN Numerical Grade GOST SS14 BS EN/BS
W6Mo5Cr4V2Co5 SKH55 HS6-5-2-5 S6-5-2-5 Z85WDKCV06-05-04-02 HS6-5-2-5 1.3243 R6M5K5 2723 BM35
2 Approximate Comparison Table High-Speed Tool Steels
China Japan South Korea International Organization for Standardization Germany
GB JIS KS ISO DIN EN/DIN
W6Mo5Cr4V2Co5 SKH55 SKH55 HS6-5-2-5 HS6-5-2-5
3 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
W6Mo5Cr4V2Co5 T76545 SKH55 SKH55 SKH55 M36 T11336 HS 6-5-2-5 S 6-5-2-5 1.3243 HS 6-5-2-5 Р6М5К5 2723 HS 6-5-2-5
4 Approximate Comparison Table High-Speed Steel 4
China Japan South Korea United States Germany France European Standard Russia Sweden United Kingdom
GB JIS KS UNS DIN EN/DIN W-Nr. NF EN/NF EN Numerical Grade GOST SS14 BS EN/BS
W6Mo5Cr4V2Co5 SKH55 SKH55 T11341 S 6-5-2-5
HS 6-5-2-5
S 6-5-2-5S 		1.3243 06-05-05-04-02
HS 6-5-2-5
HS 6-5-2-5HC
HS 6-5-2HC
Z85WDKCV
Z90WDKCV 		HS 6-5-2-5 1.3243 Р6М5К5
R6M5K5 		2723
2733 		3243
BM35
W6Mo5Cr4V2Co5 Corresponding Standards(Same grade name, different standards)
1 GB /T 9943-2008
W6Mo5Cr4V2Co5 T76545
2 GB 9943-1988
W6Mo5Cr4V2Co5
3 GB /T 9943-2025
W6Mo5Cr4V2Co5 T32430

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