- ASTM A684/A684M-2024

SAE Steel Number	1050
Corresponding Standard	ASTM A684/A684M-2024 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	-	-	0.25	-	0.3	0.1	Type 1：Si 0.15~0.30 Type 2：Si≤0.10 ①
Maximum Value	0.55	0.9	0.03	0.035	0.3	0.3	0.5	0.16	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.
③ When the chromium is specified or added for antigraphitization, the maximum shall be 1.40%.

New and Old Grade Replacement List

Corresponding Standard	Grade
ASTM A682/A682M-2005	USA UNS SAE
ASTM A684/A684M-2024	SAE

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