What is ASTM A283 grade C equivalent material in JIS standard

ASTM A283 grade C is a steel material grade defined in ASTM A283/A283M standard, the American material standard for hot rolled steel plates for general intermediate strength usage.

ASTM A283 grade C equivalent material in JIS standard is JIS G 3101 SS400. Below is the comparison between ASTM A283 grade C equivalent material SS400 and A283 grade C steel.

ASTM A283 grade C equivalent material SS400 and A283 grade C steel chemical composition %:

Grade	C  (t≤16mm)	Si	Mn	P	S	Cu
A283 grade C	0.24 max	0.04 max	0.09 max	0.035 max	0.04 max	0.20 min
SS400	-	-	-	0.50 max	0.50 max	-

ASTM A283 grade C equivalent material SS400 and A283 grade C steel mechanical properties:

Grade	Yield strength ReH/(N/mm2) (t≤16mm) min	Tensile strength Rm/(N/mm2) (3mm≤t≤16mm)	Elongation A/%(3mm≤t≤40mm) min
A283C	205	380-515	25
SS400	245	400-500	21

The chemical composition of SS400 steel is not as strict as that of ASTM A283 grade C steel. But the mechanical properties of SS400 steel is even higher than ASTM A283 grade C steel. The industry insiders always consider SS400 steel as ASTM A283 grade C equivalent material in JIS standard. If you want to use one to replace the other, please get further engineering approval.