牌号

C

Si

Mn

P

S

V

Nb

Al

Ti

Q345A

0.20

≤0.55

≤1.70

≤0.045

≤0.045

0.02-0.15

0.015-0.060

-

0.02-0.20

Q345B

≤0.20

≤0.55

≤1.70

≤0.040

0.040

0.02-0.15

0.015-0.060

-

0.02-0.20

Q345C

≤0.20

≤0.55

≤1.70

≤0.035

≤0.035

0.02-0.15

0.015-0.060

≥0.015

0.02-0.20

Q345D

0.18

≤0.55

≤1.80

≤0.030

≤0.030

0.02-0.15

0.015-0.060

≥0.015

0.02-0.20

Q345E

≤0.18

≤0.55

≤1.80

≤0.025

≤0.025

0.02-0.15

0.015-0.060

≥0.015

0.02-0.20