- ASTM A684/A684M-2024

SAE Steel Number	1055
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	0.5	0.6	-	-	0.25	-	0.3	0.1	Type 1：Si 0.15~0.30 Type 2：Si≤0.10 ①
Maximum Value	0.6	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

1 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
C55	S55C	1055	C55 C55E4	C55	AF70C55 C54	C55	1.0535	50 55	1655	070M55 50 En9

2 Approximate Comparison Table High-Quality Carbon Structural Steel

Japan	United States	International Organization for Standardization	Germany	France	European Standard		Russia	United Kingdom
JIS	ASTM	ISO	DIN EN/DIN	NF EN/NF	EN	Numerical Grade	GOST	BS EN/BS
S55C	1055	C55E4	Ck55	XC54 XC55H1	C55E	1.1203	55	070M55

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