|
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 |
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|
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 |
/ |
/ |
/ |
/ |
||
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.
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%
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