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ASTM A403


Chemical Composition (%) of ASTM A403

Steel No.


Type


Chemical composition

C

Si

S

P

Mn

Cr

Ni

Mo

Other

ób

ós

δ5

WP304

0.08

1

0.03

0.045

2

18-20

8-11



515

205

28


WP304H

0.04-0.1

1

0.03

0.045

2

18-20

8-11



515

205

28


WP304L

0.035

1

0.03

0.045

2

18-20

8-13



485

170

28


WP304LN

0.03

0.75

0.03

0.045

2

18-20

8-10.5


N2:0.1-0.16

515

205

28


WP304N

0.08

0.75

0.03

0.045

2

18-20

8-11


N2:0.1-0.16

550

240

28


WP309

0.15

1

0.03

0.045

2

22-24

12-15



515

205

28


WP310

0.15

1.5

0.03

0.045

2

24-26

19-22



515

205

28


WP316

0.08

1

0.03

0.045

2

16-18

10-14

2-3


515

205

28


WP316H

0.04-0.1

1

0.03

0.045

2

16-18

10-14

2-3


515

205

28


WP316LN

0.03

0.75

0.03

0.045

2

16-18

11-14

2-3

N2:0.1-0.16

515

205

28


WP316L

0.035

1

0.03

0.045

2

16-18

10-16

2-3


485

170

28


WP316N

0.08

0.75

0.03

0.045

2

16-18

11-14

2-3

N2:0.1-0.16

550

240

28


WP317

0.08

1

0.03

0.045

2

18-20

11-15

3-4


515

205

28


WP317L

0.03

1

0.03

0.045

2

18-20

11-15

3-4


515

205

28


WP321

0.08

1

0.03

0.045

2

17-20

9-13


Ti:5C-0.7

515

205

28


WP321H

0.04-0.1

1

0.03

0.045

2

17-20

9-13


Ti:4C-0.7

515

205

28


WP347

0.08

1

0.03

0.045

2

17-20

9-13


Nb+Ta:10C-1.1

515

205

28


WP347H

0.04-0.1

1

0.03

0.045

2

17-20

9-13


Nb+Ta:8C-1

515

205

28


WP348

0.08

1

0.03

0.045

2

17-20

9-13


Ta:0.1

515

205

28


WP348H

0.04-0.1

1

0.03

0.045

2

17-20

9-13


Ta:0.1

515

205

28



Notes:

For each reduction of 0.01% below the specified C maximum, an increase of 0.06% Mn above the specified maximum will be permitted, up to a maximum of 1.35%.

The sum of Cu, Ni, Cr, and Mo shall not exceed 1.00%.

The sum of Cr and Mo shall not exceed 0.32%.

The maximum carbon equivalent (C.E.) shall be 0.50, based on heat analysis and the formula C.E.=C+Mn/6+(Cr+Mo+V)/5+(Ni+Cu)/15.


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