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Grade SKH 4
Corresponding Standard JIS G 4403-2005
High speed tool steels
Classification Tool Steel
SKH 4 Chemical Element Composition Content (%)
Component C Si Mn P S Cr Cu W V Co
Minimum Value 0.73 - - - - 3.8 - 17 1 9
Maximum Value 0.83 0.45 0.4 0.03 0.03 4.5 0.25 19 1.5 11
SKH 4 Mechanical Properties
condition Heat Treatment or Condition
Hardness
HBW
Bar, forging Annealing ≤285
Bar, forging Quenching + Tempering HRC
≥64
1 Approximate Comparison Table High-speed tool steels
Japan United States International Organization for Standardization France United Kingdom
JIS ASTM/AISI ISO NF EN/NF BS EN/BS
SKH4 T5 HS18-0-1-10 HS18-0-2-9 BT5
2 Approximate Comparison Table
China Taiwan, China Japan South Korea United States Germany France Sweden United Kingdom
GB ISC CNS JIS KS ASTM UNS DIN EN/DIN W-Nr. NF EN/NF SS14 BS EN/BS
W18Cr4V2Co8 T71848 ≈SKH 4 ≈SKH 4 ≈SKH 4 T5 T12005 ≈S 18-1-2 1.3265 HS 18-0-2-9 2756 BT5
SKH4 Corresponding Standards(Same grade name, different standards)
1 YJT
SKH4 1.3265（VDEh） SKH4（JIS） T5
2 JIS G 4403-2005
SKH 4
3 JIS G 4403-2022
SKH 4

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