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標準

牌號

化學成分（％）

C

Si

Mn

P

S

Cr

Ni

Cu

Mo

V

Al

ASTM

A333

Grade 1

≤0.30

0.40-1.06

≤0.025

≤0.025

Grade 3

≤0.19

0.18-0.37

0.31-0.64

≤0.025

≤0.025

3.18-3.82

Grade 4

≤0.12

0.18-0.37

0.50-1.05

≤0.025

≤0.025

0.44-1.01

0.47-0.98

0.40-0.75

0.04-0.30

Grade 6

≤0.30

≥0.10

0.29-1.06

≤0.025

≤0.025

Grade 7

≤0.19

0.13-0.32

≤0.90

≤0.025

≤0.025

2.03-2.57

Grade 8

≤0.13

0.13-0.32

≤0.90

≤0.025

≤0.025

8.40-9.60

Grade 9

≤0.20

0.40-1.06

≤0.025

≤0.025

1.60-2.24

0.75-1.25

Grade 10

≤0.20

0.10-0.35

1.15-1.50

≤0.03

≤0.015

≤0.15

≤0.25

≤0.015

≤0.50

≤0.12

≤0.06

Grade 11

≤0.10

≤0.35

≤0.6

≤0.025

≤0.025

≤0.50

35.0-37.0

≤0.50