The main chemical element Carbon which is in the range of 0.12–2.0% is defined as Carbon steel.It only allows other elements which are manganese (1.65% max), silicon (0.60% max), and copper (0.60% max).Other elements may be present in quantities too small to affect its properties.Steel with a low carbon content has the same properties as iron, soft but easily formed. As carbon content rises the metal becomes harder and stronger by heat treatment, but less ductile and more difficult to weld. Higher carbon content lowers steel's melting point and its temperature resistance in general.

General Production Size:

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AISI/SAE	DIN/EN	BS	JIS/KS
1015	C15 / 1.0401	080M15	S15C
1018			S17C
1020	C22 / 1.0402	070M20 / EN3	S20C
1025	C25 / 1.0406	070M26	S25C
1030	C30 / 1.0528	080M32 / EN5	S30C
1035	C35 / 1.1181	070M36	S35C
1040	C40 / 1.0511	080M40 / EN8	S40C
1045	C45 / 1.1191	080M46	S45C
1050	C50 / 1.0540	080M50	S50C
1055	C55 / 1.0535	070M55 / EN9	S55C
1060	C60 / 1.1221	070M60	S58C