美標管種類

美標管外徑(D)

美標管壁厚(S)

冷拔美標管

鋼管外徑

鋼管允許公差

壁厚

鋼管允許公差

>30~50

+0.3%

≤25

+10%

>50~325

+0.8%

熱軋美標管

>6~168

+1.0%

≤25

-10%，+12.5%

鋼管標準

鋼管牌號

A106無縫鋼管化學成分

C

Si

Mn

P

S

Cr

Mo

Cu

Ni

V

ASTM A106

A

≤0.25

≥0.10

0.27~0.93

≤0.035

≤0.035

≤0.40

≤0.15

≤0.40

≤0.40

≤0.08

B

≤0.30

≥0.10

0.29~1.06

≤0.035

≤0.035

≤0.40

≤0.15

≤0.40

≤0.40

≤0.08

C

≤0.35

≥0.10

0.29~1.06

≤0.35

≤0.35

≤0.40

≤0.15

≤0.40

≤0.40

≤0.08