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Home Material ISO 683-11-1987
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Grade 20Cr4H
ISO Numeric Designation (4)
Other Names
Corresponding Standard ISO 683-11-1987
heat-treatable steels, alloy steels and free-cutting steels -- part 11: case-hardening steels
Classification Alloy Steel
Properties Quench Hardness
20Cr4H Chemical Element Composition Content (%)
Component C Si Mn P S Cr
Minimum Value 0.17 0.15 0.6 - - 0.9
Maximum Value 0.23 0.4 0.9 0.035 0.035 1.2
1 Approximate Comparison Table
China Japan South Korea United States International Organization for Standardization Germany France Russia United Kingdom
GB ISC JIS KS ASTM UNS ISO DIN EN/DIN W-Nr. NF EN/NF GOST BS EN/BS
20CrH A20205 ≈SCr420H ≈SCr420H 5120H H51200 ≈20Cr4H 20Cr4 1.7027 (20MC5) 20Х (527H17)
2 Approximate Comparison Table
China Taiwan, China Japan South Korea United States International Organization for Standardization Germany Russia
GB ISC CNS JIS KS ASTM UNS ISO DIN EN/DIN W-Nr. GOST
20Cr1H A20215 SCr420H SCr420H SCr420H ≈5120H ≈H51200 20Cr4H ≈20Cr4 ≈1.7027 20Х

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