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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 ① Mn P S Cr ② ③ Ni ② Cu ② Mo ②
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
1 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
2 Approximate Comparison Table Non-Alloy Steel for Quenching and Tempering
United States International Organization for Standardization Germany European Standard
ASTM ISO DIN EN/DIN EN Numerical Grade
1050 C50R
C50M2 		Cm50 C50R 1.1241
3 Approximate Comparison Table Wrought Aluminum and Aluminum Alloy
China Japan United States International Organization for Standardization Germany European Standard United Kingdom
GB JIS ASTM UNS ISO Numerical Grade DIN EN/DIN W-Nr. EN Commercial Grade BS EN/BS
1050 1050
A91050 		1050 A91050 Al99.5 A91050 Al99.5 3.0255
A91050 		EN-AW-Al99.5 1B 1050
A91050
4 Approximate Comparison Table High-Quality Carbon Structural Steel
China Japan United States International Organization for Standardization Germany France European Standard Russia Sweden United Kingdom
GB JIS ASTM ISO DIN EN/DIN NF EN/NF EN Numerical Grade GOST SS BS EN/BS
50 S50C 1049
1050 		C50
C50E4 		C50
Ck50 		XC48H1 C50 1.0540 50 1674 070M50
080M50
5 Approximate Comparison Table High-Quality Carbon Structural Steel
Japan United States International Organization for Standardization Germany France European Standard Russia Sweden United Kingdom
JIS ASTM ISO DIN EN/DIN NF EN/NF EN Numerical Grade GOST SS BS EN/BS
S50C 1050 C50E4 Ck50 XC50 C50E 1.1206 50 1674 080M50
CS50
6 Approximate Comparison Table Thermal Bimetal
China Japan United States International Organization for Standardization France Russia
GB JIS ASTM ISO NF EN/NF GOST
5J1306A TM5A, TR25 1050 TB137/16 R40, R8 ТБ1353
ТБ0953
7 Approximate Comparison Table Steel for Cold Heading and Cold Extrusion
China Japan United States
GB JIS ASTM
ML50 SWRCH50K 1050

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