USA UNS G10500
SAE
Steel Number
1050
Corresponding Standard ASTM A682/A682M-2005
Standard Specification for Steel, Strip, High-Carbon, Cold-Rolled, General Requirements For
Classification Carbon Steel
Chemical Element Composition Content (%)
Component C Si Mn P S Cr ② ③ Ni Cu Mo
Minimum Value 0.48 0.15 0.6 - - - - - -
Maximum Value 0.55 0.3 0.9 0.03 0.035 0.25 0.3 0.3 0.1
* There is no specified limit on aluminum, vanadium, niobium, and titanium, but the analysis shall be reported.
① When agreed by purchaser and supplier, other silicon ranges are permissible.
② The sum of copper. nickel, chromium, and molybdenum shall not exceed 0.80 % on heat analysis. When one or more of these elements is specified, the sum does not apply, in which case only the individual limits on the remaining elements will apply.
③ When the chromium is specified or added for antigraphitization, the maximum shall be 1.40 wt. %.
New and Old Grade Replacement List
Corresponding Standard Grade
ASTM A682/A682M-2005
USA UNS
SAE
ASTM A684/A684M-2024
SAE
Approximate Comparison Table High-Quality Carbon Structural Steel
China Taiwan, China Japan South Korea United States International Organization for Standardization Germany France Russia Sweden United Kingdom
GB ISC CNS JIS KS ASTM/AISI UNS ISO DIN EN/DIN W-Nr. NF EN/NF GOST SS BS EN/BS
50 U20502 S50C S50C SM50C 1050 G10500 C50E4 C50E
Ck53
1.1210 C50E 50 1674 C50E
080M50

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