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API 5L
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ASTM A105
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A350 LF2
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ASTM A420
ASTM A860
 A193 B7
A194 2H
A240 GR.410
A312 S31726

ASTM A420 

ASTM A420 Standard Specification for Piping Fittings of Wrought Carbon Steel and Alloy Steel for Low-Temperature Service

Grade: WPL6

Chemical Requirements Composition, %

C: 0.30

Mn: 0.50-1.35

P: 0.035

S: 0.040

Si: 0.15-0.40

Ni: 0.40

Cr: 0.30

Mo: 0.12

Cu: 0.40

Cb: 0.02

V: 0.08

*By agreement, the limit for Columbium may be increased up to 0.05 % on heat analysis and 0.06 % on product analysis.

Post-Weld Heat Treatment: 595–650 °C

Tensile Requirements

Tensile strength, min MPa: 415 − 585

Yield strength, min MPa: 240

Elongation Requirements

Longitudinal

Transverse

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

22

12

Rectangular specimen for wall thickness 5⁄16 in. [7.94mm] and over, and for all small sizes tested in fullsection; min % in 2 in. or 50 mm

30

16.5

 

Wall Thickness, mm

Longitudinal

Transverse

7.94

30.0

16.5

7.14

28.5

15.5

6.35

27.0

14.5

5.56

25.5

-

4.76

24.0

-

3.97

22.5

-

3.17

21.0

-

2.38

19.5

-

1.59

18.0

-

 

Charpy Impact Requirements

Impact Test Temperature: -45°C

Size of Specimen, mm

Charpy V-Notch Impact Value Required for Acceptance (Average of Three Specimens)

Minimum Charpy V-Notch Impact Value Without Requiring Retest (One Specimen Only of a Set)

10 by 10.0

17.6

13.6

10 by 7.5

13.6

10.8

10 by 5.0

9.5

7.0

10 by 2.5

5.4

4.1

 


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