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USA UNS G10780
AISI
American Iron and Steel Institute		 1078
Corresponding Standard ASTM A29/A29M-2020
General Requirements for Steel Bars, Carbon and Alloy, Hot-Wrought
Classification Carbon Steel
Properties Forgability
Chemical Element Composition Content (%)
Component C Mn P S
Minimum Value 0.72 0.3 - -
Maximum Value 0.85 0.6 0.04 0.05
Approximate Comparison Table Spring Steel
United States Germany France European Standard Russia Sweden United Kingdom
AISI UNS DIN EN/DIN W-Nr. NF EN/NF EN Numerical Grade GOST SS14 BS EN/BS
1078 G10780 Ck75 1.1248 C75RR C75S 1.1248 75A 1774 CS80

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