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Home Material GB /T 9943-2008
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Grade W6Mo5Cr4V2Co5
China ISC T76545
Corresponding Standard GB /T 9943-2008
High-Speed Tool Steels
Classification Tool Steel
W6Mo5Cr4V2Co5 Chemical Element Composition Content (%)
Component C Si ① Mn P S ② Cr Ni ③ Cu ③ 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 0.03 4.5 0.3 0.25 5.2 6.7 2.1 5
① The lower limit of silicon content in electro-slag steel is not specified.
② Upon the request of the buyer, to improve the machinability of the steel, the sulfur content may be specified as 0.06% to 0.15%.
③ Cu and Ni are residual contents.
W6Mo5Cr4V2Co5 Mechanical Properties
condition Heat Treatment or Condition
Hardness
HBW
Delivery condition Annealing ≤269
sample Quenching and Tempering HRC
≥64
Notes:
① When the tempering temperature is 550 to 570°C, temper twice, each time for 1 hour; when the tempering temperature is 540 to 560°C, temper twice, each time for 2 hours; when the tempering temperature is 530 to 550°C, temper three times, each time for 2 hours.
② For annealed and cold-drawn condition, the hardness may be allowed to increase by 50 HBW over the annealed condition.
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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