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Grade SM
Corresponding Standard ISO 8458-2-2002
Steel Wire for Mechanical Springs — Part 2: Patented Cold-Drawn Non-Alloy Steel Wire
Classification Carbon Steel
Properties Elasticity
SM Chemical Element Composition Content (%)
Component C Si Mn P S Cu
Minimum Value 0.35 0.1 0.3 - - -
Maximum Value 1 0.3 1.2 0.03 0.03 0.2
1 Approximate Comparison Table High-Quality Carbon Structural Steel
China United States International Organization for Standardization Germany France Russia Sweden United Kingdom
GB ISC ASTM/AISI UNS ISO DIN EN/DIN W-Nr. NF EN/NF GOST SS BS EN/BS
65 U20652 1065 G10650 SL
SM 		Ck67 1.1231 XC65 65 1770 060A67
2 Approximate Comparison Table High-Quality Carbon Structural Steel
China Japan United States International Organization for Standardization Germany France Russia United Kingdom
GB ISC JIS ASTM/AISI UNS ISO DIN EN/DIN W-Nr. NF EN/NF GOST BS EN/BS
40Mn U21402 (SWRH42B) 1039 G10390 SL
SM 		40Mn4 1.1157 40M5 40г 080A40
3 Approximate Comparison Table High-Quality Carbon Structural Steel
China Japan United States International Organization for Standardization France Russia Sweden United Kingdom
GB ISC JIS ASTM/AISI UNS ISO NF EN/NF GOST SS BS EN/BS
45Mn U21452 (SWRH47B) 1046 G10460 SL
SM 		45M5 45г 1672 080A47
4 Approximate Comparison Table High-Quality Carbon Structural Steel
China Japan United States International Organization for Standardization Russia Sweden United Kingdom
GB ISC JIS ASTM/AISI UNS ISO GOST SS BS EN/BS
50Mn U21502 (SWRH52B) 1053 G10530 SL
SM 		50г 1674 080A52
5 Approximate Comparison Table High-Quality Carbon Structural Steel
China Taiwan, China Japan United States International Organization for Standardization Germany Russia Sweden United Kingdom
GB ISC CNS JIS ASTM/AISI ISO DIN EN/DIN W-Nr. GOST SS BS EN/BS
60Mn U21602 S58C S58C
(SWRH62B) 		1062 SL
SM 		60Mn3 1.0642 60г 1678 080A62
SM Corresponding Standards(Same grade name, different standards)
1 ISO 8458-2-2002
SM
2 GB /T 4357-2009
SM

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