Composition, %

WPB B,C,D,E,

WPC C,D,E,

WP11 CL1

WP11 CL2,

WP11 CL3

WP22 CL1,

WP22 CL3

WP5 CL1,

WP5 CL3

Carbon

0.3

0.35

0.05–0.15

0.05–0.20

0.05–0.20

0.05–0.15

0.05–0.15

0.15

0.15

Manganese

0.29–1.06

0.29–1.06

0.30–0.60

0.30–0.80

0.30–0.80

0.30–0.60

0.30–0.60

0.30–0.60

0.30–0.60

Phosporus

0.05

0.05

0.03

0.04

0.04

0.04

0.04

0.04

0.04

Sulfur

0.058

0.058

0.03

0.04

0.04

0.04

0.04

0.03

0.03

Silicon

0.10 min

0.10 min

0.50–1.00

0.50–1.00

0.50–1.00

0.5

0.5

0.5

0.5

Chromium

0.4

0.4

1.00–1.50

1.00–1.50

1.00–1.50

1.90–2.60

1.90–2.60

4.0–6.0

4.0–6.0

Molybdenum

0.15 max

0.15 max

0.44–0.65

0.44–0.65

0.44–0.65

0.87–1.13

0.87–1.13

0.44–0.65

0.44–0.65

Nickel

0.4

0.4

-

-

-

-

-

-

-

Copper

0.4

0.4

-

-

-

-

-

-

-

Others

Vanadium 0.08

Vanadium 0.08

-

-

-

-

-

-

-

WP9 CL1,

WP9 CL3

WP91

Carbon

0.15

0.15

0.08–0.12

Manganese

0.30–0.60

0.30–0.60

0.30–0.60

Phosporus

0.03

0.03

0.02

Sulfur

0.03

0.03

0.01

Silicon

1

1

0.20–0.50

Chromium

8.0–10.0

8.0–10.0

8.0–9.5

Molybdenum

0.90–1.10

0.90–1.10

0.85–1.05

Nickel

-

-

0.4

Copper

-

-

-

Others

-

-

Vanadium 0.18–0.25
Columbium 0.06-0.10
Nitrogen 0.03-0.07
Aluminum 0.02F
Titanium 0.01F
Zirconium 0.01F

WPB

WPC,
WP11-CL2

WP11-CL1,
WP22-CL1
WP5-CL1
WP9-CL1

WP11-CL3,
WP22-CL3
WP5-CL3
WP9-CL3

WP91

Tensile strength, minimum unless a range is given ksi (MPa)

60 (415)

70 (485)

60 (415)

75 (520)

90 (620)

Yield,strength, min ksi (MPa) (0.2% offset or 0.5% extension under-load)

35 (240)

40 (275)

30 (205)

45 (310)

60 (415)

WPB,
WPC, WP11, WP22

WP91

Longitudinal

Transverse

Longitudinal

Transverse

Standard
round specimen, or small proportional specimen, min % in 4 D

22

14

20

13

Rectangular specimen for wall thickness 5/16″ and over, and
for all small sizes tested in full section; min % in 2 in.

30

20 A

Rectangular specimen for wall thickness less than 5/16″;
min % in 2 in (1/2″ wide specimen)

B

B