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Grade HS 6-5-2-5
ISO Numeric Designation 1.3243
Corresponding Standard ISO 4957-2018
Tool Steels
Classification Alloy Steel
Density 8.2 g/cm3
HS 6-5-2-5 Chemical Element Composition Content (%)
Component C Si Mn ① P S ① Cr Mo W V Co
Minimum Value 0.87 - - - - 3.8 4.7 5.9 1.7 4.5
Maximum Value 0.95 0.45 0.4 0.03 0.03 4.5 5.2 6.7 2.1 5
HS 6-5-2-5 Mechanical Properties
Hardness
HBW
Softening Annealed ≤269
Quenching and Tempering HRC
≥64
1 Approximate Comparison Table High-Speed Tool Steels
Japan International Organization for Standardization Germany European Standard
JIS ISO DIN EN/DIN W-Nr. EN Numerical Grade
SKH55 HS6-5-2-5 HS6-5-2-5
(S 6-5-2-5) 		1.3243 HS6-5-2-5 1.3243
2 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
3 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
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
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
HS6-5-2-5 Corresponding Standards(Same grade name, different standards)
1 DIN EN ISO 4957-2018
HS 6-5-2-5 1.3243
2 ISO 4957-2018
HS 6-5-2-5 1.3243

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