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牌號(hào)

C

Si

Mn

P

S

Cr

Ni

Cu

10

0.07~0.13

0.17~0.37

0.35~0.65

≤0.035

≤0.035

≤0.15

≤0.30

≤0.25

20

0.17~0.23

0.17~0.37

0.35~0.65

≤0.035

≤0.035

≤0.25

≤0.30

≤0.25

45

0.42~0.50

0.17~0.37

0.50~0.80

≤0.035

≤0.035

≤0.25

≤0.30

≤0.25

Q235

A

≤0.22

≤0.35

≤1.40

≤0.030

≤0.030

≤0.30

≤0.30

≤0.20

B

≤0.20

C

≤0.17

≤0.030

≤0.030

D

≤0.025

≤0.025

Q275

A

≤0.24

≤0.35

≤1.50

≤0.030

≤0.030

≤0.30

≤0.30

≤0.20

B

≤0.21

C

≤0.20

≤0.030

≤0.030

D

≤0.025

≤0.025