- ASTM A684/A684M-2025

SAE Steel Number	1050
Corresponding Standard	ASTM A684/A684M-2025 Standard Specification for Steel, Strip, High-Carbon, Cold-Rolled
Classification	Carbon Steel

Chemical Element Composition Content (%)

Component	C	Mn	P	S	Cr ^{② ③}	Ni ^②	Cu ^②	Mo ^②	More
Minimum Value	0.48	0.6	-	-	-	-	-	-	Type 1：Si 0.15~0.30 Type 2：Si≤0.10 ①
Maximum Value	0.55	0.9	0.03	0.035	0.25	0.3	0.3	0.1	Type 1：Si 0.15~0.30 Type 2：Si≤0.10 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. The maximum content of Cu can also reach 0.50%, Cr can also reach 0.30%, and Mo can also reach 0.16%.
③ When the chromium is specified or added for antigraphitization, the maximum shall be 1.40%.

1 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

2 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

3 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

4 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

5 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

6 Approximate Comparison Table Steel for Cold Heading and Cold Extrusion

China	Japan	United States
GB	JIS	ASTM
ML50	SWRCH50K	1050

7 Approximate Comparison Table Steel for Cold Heading and Cold Extrusion

China	Japan	United States
YB	JIS	ASTM
QML50	SWRCH50K	1050

Note: The data is for reference only! If you have any questions, please fill out "I want to correct it"!