材质

Chemical Constituent(化学成分)   %

机械性能

C

Si

Mn

P

S

屈服强度

抗拉强度

伸长率

20#钢管

0.17~0.23

0.17~0.37

0.35~0.65

≤0.035

≤0.035

245

410

25

40#钢管

0.37～0.45

0.17～0.37

0.50～0.80

≤0.035

≤0.035

335

570

19

45#钢管

0.42-0.50

0.17-0.37

0.50-0.80

≤0.035

≤0.035%

355

600

16

Q235A钢管

0.14~0.22

0.3

0.30~0.65

≤0.05

≤0.045

235

375-460

26

Q235B钢管

0.12~0.20

0.3

0.30~0.70

≤0.045

≤0.045

235

375-460

26

Q235C钢管

≤0.18

0.3

0.35~0.80

≤0.04

≤0.04

235

375-460

26

Q235D钢管

≤0.17

0.3

0.35~0.80

≤0.035

≤0.035

235

375-460

26

Q345A钢管

≤0.20 

≤0.55

1.00-1.60

≤0.045

≤0.045

345

470-630

21

Q345B钢管

≤0.20 

≤0.55

1.00-1.60

≤0.040

≤0.040

345

470-630

21

Q345C钢管

≤0.20

≤0.55

1.00-1.60

≤0.035

≤0.035

325

470-630

22

Q345D钢管

≤0.18

≤0.55

1.00-1.60

≤0.030

≤0.030

295

470-630

22

Q345E钢管

≤0.18

≤0.55

1.00-1.60

≤0.025

≤0.025

275

470-630

22