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Grade 4118H
USA UNS H41180
Corresponding Standard ASTM A 304-2004
Carbon and Alloy Steel Bars Subject to End-Quench Hardenability Requirements
Classification Alloy Steel
4118H Chemical Element Composition Content (%)
Component C Si Mn P S Cr Mo
Minimum Value 0.17 0.15 0.6 - - 0.3 0.08
Maximum Value 0.23 0.35 1 0.025 0.025 0.7 0.15
1 Approximate Comparison Table Hardenability Guaranteed Structural Steel
China Taiwan, China Japan South Korea United States International Organization for Standardization Germany France Russia United Kingdom
GB ISC CNS JIS KS ASTM UNS ISO DIN EN/DIN W-Nr. NF EN/NF GOST BS EN/BS
15CrMoH A30155 SCM415H SCM415H SCM415H ≈4118H ≈H41180 16CrMo5H 15CrMo5 1.7262 (15CD35) 15ХМ 15CrMo5
2 Approximate Comparison Table Hardenability Guaranteed Structural Steel
China Taiwan, China Japan South Korea United States International Organization for Standardization Germany France Russia United Kingdom
GB ISC CNS JIS KS ASTM UNS ISO DIN EN/DIN W-Nr. NF EN/NF GOST BS EN/BS
20CrMnH A30205 SCM420H SCM420H SCM420H 4118H H41180 18CrMo4H 18CrMo4 1.7243 18CrMo4
(20CD4) 		20ХМ 18CrMo4
3 Approximate Comparison Table Hardenability Guaranteed Structural Steel
China United States International Organization for Standardization Germany France Russia United Kingdom
GB ISC ASTM UNS ISO DIN EN/DIN W-Nr. NF EN/NF GOST BS EN/BS
20CrMnMoH A34205 4118H H41180 20MnCr5H ≈20MnCr5 ≈1.7147 (20MC5H) 25ХГМ (708H20)
4118H Corresponding Standards(Same grade name, different standards)
1 ASTM A 304-2004
4118H H41180
2 SAE J 1268-2010
4118H H41180
3 ASTM A304-2016
4118 H H41180
4 ASTM A534-2014
4118H

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