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等級

C

Mn

Si

P

S

V

Nb

Ti

Al

Cr

Ni

A

≦0.20

1.00~1.70

≦0.55

≦0.045

≦0.045

0.02~0.20

0.015~0.060

0.02~0.20

-

≦0.40

≦0.70

B

≦0.20

1.00~1.70

≦0.55

≦0.040

≦0.040

0.02~0.20

0.015~0.060

0.02~0.20

-

≦0.40

≦0.70

C

≦0.20

1.00~1.70

≦0.55

≦0.035

≦0.035

0.02~0.20

0.015~0.060

0.02~0.20

≧0.015

≦0.40

≦0.70

D

≦0.20

1.00~1.70

≦0.55

≦0.030

≦0.030

0.02~0.20

0.015~0.060

0.02~0.20

≧0.015

≦0.40

≦0.70

E

≦0.20

1.00~1.70

≦0.55

≦0.025

≦0.025

0.02~0.20

0.015~0.060

0.02~0.20

≧0.015

≦0.40

≦0.70

等級

δ5/%

A

≧18

B

≧18

C

≧19

D

≧19

E

≧19

厚度(直徑、邊長)/mm

≦16

>16~35

>35~50

>50~100

σs/MPa

≧420

≧400

≧380

≧360

等級￤溫度

+20℃

0℃

-20℃

-40℃

A

B

≧34

C

≧34

D

≧34

E

≧27