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20mn Quality Carbon Steel

Chemical Composition

Grade	Chemical Composition%
	C	Si	Mn	Cr	Ni	Cu
	C	Si	Mn	Not greater than
20	0.17~	0.17~0.37	0.35~0.65	0.25	0.30	0.25
45	0.42~0.50	0.17~0.37	0.50~0.80	0.25	0.30	0.25
20Mn	0.17~0.24	0.17~0.37	0.70~1.00	0.25	0.25	0.25
50Mn	0.48~0.56	0.17~0.37	0.70~1.00	0.25	0.25	0.25

Mechanical Property

Grade	Mechanical Property					Hardness of deliveryNot greater than
	Tensile Strength σb (MPa)	Yield Strengthσs (MPa）	Elongation Rate δ5 (%)	Shrinkage Ratio ψ (%)	Impact Energy Akv (J)	Hardness of deliveryNot greater than
	Not less than					Non thermal treatment（HB）	Annealed steel （HB）
20	410	245	25	55		1 56
45	600	355	16	40	39	229	197
20Mn	450	275	24	50		197
50Mn	645	390	13	40	31	255	217

Implementation Standards

Name	Standard
Name	Standard or Agreement	Representative Brand	ASME/ASTM	JIS	DIN	EN
High-quality carbon structural steel	GB/T 699-1999	20	1020	S20C	C22E	C22E
		45	1045	S45C	C45E	C45E
		20Mn	1022	SWRCH22K	CK22	20M5
		50Mn	1053	SWRCH50K	CK50	C45

Applicable Scope

Carbon steel smelting is usually in the converter, open hearth furnace. General converter smelting ordinary carbon steel, and can be a variety of high quality steel smelting furnace. BOF steelmaking technology develops very fast, there is a tendency to replace the open hearth. The molten steel is injected into the ingot mould and various ingots are obtained. After forging or rolling, the ingot is processed into steel plate, steel strip, steel bar and section steel with various section shapes. Carbon steels are generally used directly in hot rolling. When used in manufacturing tools and various machine parts, heat treatment should be carried out according to the use requirements; as for steel castings, most of them need heat treatment.

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20mn Quality Carbon Steel