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Chemical Composition
|
Grade
|
（Carbon Steel）Chemical Composition (mass fraction) %
|
||||||
|
C
|
Si
|
Mn |
P
|
S
|
Alt
|
Others
|
|
|
30
|
0.27～0.34
|
0.17～0.37
|
0.50～0.80
|
≤0.030
|
≤0.030
|
- |
Cu≤0.25, Ni≤0.30, Cr≤0.20, N≤0.008
If the supplier can guarantee it, no analysis will be carried out) |
Physical Properties
|
Grade
|
Yield Strength
(MPa) |
Tensile Strength (MPa)
|
Elongation A80mm %
|
Reduction of Area %
|
Impact Force
(J) |
Impact Toughness Value (J/cm²)
|
Hardness:
Untempered |
|
30
|
≥295
|
≥490
|
≥21
|
≥50
|
≥63
|
≥39
|
≤ 179HB
|
Corresponding Standards and Similar Grade Comparison
|
ASTM
|
BS
|
NF
|
DIN
|
JIS
|
GB
|
|
1030
|
060A30
|
XC32
|
C30
|
S30C
|
30 |
Characteristics
-
Ideal for making small, low-stress parts at temps up to 150°C, like screws, rods, axles, and gears.
-
Easy to machine, widely used for mass-producing bolts and screws.
-
Suitable for cold forming, forging, and welding of parts.
- Also used for heat-treated parts like carburizing and carbonitriding.