牌号

质量等级

C

Mn

Si

S

P

V

Q345

A

≤0.20

≤1.70

≤0.55

≤0.045

≤0.045

0.01-0.15

B

≤0.040

≤0.040

C

≤0.035

≤0.035

Q420

A

≤0.20

≤1.70

≤0.55

≤0.045

≤0.045

0.02-0.15

B

≤0.040

≤0.040

C

≤0.035

≤0.035

Q460

A

≤0.20

≤1.70

≤0.55

≤0.045

≤0.045

0.02-0.15

B

≤0.040

≤0.040

C

≤0.035

≤0.035

牌号

质量

等级

物理性能

ReL/MPa

Rm/MPa

A%≥

J

厚度小于16mm

厚度大于16-35mm

+20℃

0℃

-20℃

-40℃

Q345

A

≥345

≥325

470-630

21

B

21

34

C

22

                             34

Q420

A

≥420

≥400

520-680

18

34

B

18

34

C

19

                            34

Q460

A

≥460

≥440

550-720

17

34

B

17

34

C

17

                             34