化学成分(摘自GB 713—2008)

牌号

化学成分(质量分数)/%

C^②

Si

Mn

Cr

Ni

Mo

Nb

V

P

S

Alt

Q245R^①

≤0.20

≤0.35

0.50~1.00^③

≤0.025

≤0.015

≥0.020

Q345R^①

≤0.20

≤0.55

1.20~1.60

≤0.025

≤0.015

≥0.020

Q370R

≤0.18

≤0.55

1.20~1.60

0.015~0.050

≤0.025

≤0.015

18MnMoNbR

≤0.22

0.15~0.50

1.20~1.60

0.45~0.65

0.025~0.050

≤0.020

≤0.010

13MnNiMoR

≤0.15

0.15~0.50

1.20~1.60

0.20~0.40

0.60~1.00

0.20~0.40

0.005~0.020

≤0.020

≤0.010

15CrMoR

0.12~0.18

0.15~0.40

0.40~0.70

0.80~1.20

0.45~0.60

≤0.025

≤0.010

14Cr1MoR

0.05~0.17

0.50~0.80

0.40~0.65

1.15~1.50

0.45~0.65

≤0.020

≤0.010

12Cr2Mo1R

0.08~0.15

≤0.50

0.30~0.60

2.00~2.50

0.90~1.10

≤0.020

≤0.010

12Cr1MoVR

0.08~0.15

0.15~0.40

0.40~0.70

0.90~1.20

0.25~0.35

0.15~0.30

≤0.025

≤0.010

① 如果钢中加入Nb、Ti、V等微量元素，Alt含量的下限不适用。

② 经供需双方协议，并在合同中注明，C含量下限可不作要求。

③ 厚度大于60mm的钢板，Mn含量上限可至1.20%。