Product

20# High Guality Alloy Steel






Steel

A

B

C

D

DS

Fine Lines

Thick Lines

Fine Lines

Thick Lines

Fine Lines

Thick Lines

Fine Lines

Thick Lines

High Quality Steel

3.0

2.5

3.0

2.0

2.0

1.5

2.0

1.5

/

Super Grade Steel

2.5

2.0

2.5

1.5

1.5

1.0

1.5

1.0

2.0

If the buyer has different level requirements or has the content of sulfur (S), the qualified level will be negotiated and determined by both supply and demand parties




Name

Standard

Standard or Agreement

Brand

ASME/

ASTM

JIS

DIN

EN


Alloy Structural

Steel

GB/T

3077-1999

20Mn2

1524

SMn420

20Mn5

BS 150M19

35Mn2

1335

SMn433

36Mn5

/

27SiMn

/

/

/

/

20Cr

5120

SCr420

20Cr4

DIN 20Cr4

40Cr

5140

SCr440

41Cr4

EN 41Cr4

30CrMo

4130

SCM430

30Cr4

EN 25CrMo4

35CrMo

4135

SCM435

34CrMo4

EN 34CrMo4

42CrMo

4140

SCM440

42CrMo4

EN 42CrMo4

38CrMoAl

/

SACM645

41CrAlMo7

BS 905M39

40CrNiMoA

/

/

/

/

20CrMn

/

/

20MnCr5

DIN 20MnCr5

20CrMnTi

/

/

/

/


Applicable Scope


This kind of steel, has the suitable hardenability, the suitable metal heat treatment, the microstructure of sorbite, bainite or very fine pearlite uniform, so it has high tensile strength and yield ratio (usually around 0.85), toughness and high fatigue strength and toughness. Brittle transition temperature is low, can be used in the manufacture of machine parts of larger section size.


Chemical Composition

C :0.38~0.45%

Si:0.17~0.37%

Mn:0.50~0.80%

S :Allowable residual content≤0.035%

P :Allowable residual content≤0.035%

Cr:0.90~1.20%

Ni:Allowable residual content≤0.30%

Cu:Allowable residual content≤0.30%

Mo:0.15~0.25%

Mechanical Property

The ultimate tensile strength of B (MPa): 1080 (110)
Yield strength s (MPa): 930 (95)
5 elongation (%): 12
Section shrinkage (%): 45 PSI
The impact of Akv (J): 63
The impact toughness value of alpha kV (J/cm2): 78 (8)
Hardness: 217HB
Sample size: sample blank size is 25mm





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