Product

20mn Quality Carbon Steel



Chemical Composition

Grade

Chemical Composition%

C

Si

Mn

Cr

Ni

Cu

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)

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

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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