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ASTM A420

8.3 ASTM A420.jpg

ASTM A420: American Society for Testing and Materials
Piping Fittings of Wrought Carbon Steel and Alloy Steel for Low-Temperature Service

Tensile Requirements

Requirement

Grade

WPL6

WPL9

WPL3

WPL8

Tensile strength, min ksi [MPa]

60 [415] − 85 [585]

63 [435] − 88 [610]

65 [450] − 90 [620]

100 [690] − 125 [865]

Yield strength, min ksi [MPa]

35 [240]

46 [315]

35 [240]

75 [515]

Elongation Requirements

Grade

WPL6

WPL9

WPL3

WPL8

Longitudinal

Transverse

Longitudinal

Transverse

Longitudinal

Transverse

Longitudinal

Transverse

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

22

12

20

...

22

14

16

...

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

30

16.5

28

18

30

20

22

...

Rectangular specimen for wall thickness less than     5⁄16 in [7.94 mm];   min % in 2 in. or 50 mm (1⁄2-in.     [12.7- mm] wide specimen)

A

A

A

A

A

A

A

...

A For each 1⁄32 in. [0.79 mm] decrease in wall thickness below 5⁄16 in. [7.94 mm], a deduction of 1.5 %(grades WPL6, WPL9, and WPL3) or 1.25 %       (WPL8) for longitudinal and 1.0 % (grades WPL6, WPL9 and WPL3) for transverse from the values shown above is permitted. The following table gives the minimum value for  various wall thicknesses:

 

Chemical Requirements

Grade A

Composition   %

C

Mn

P

S

Si

Ni

Cr

Mo

Cu

Cb

V

WPL6

0.30

1.50-1.35

0.035

0.04

0.15-0.40

0.40

0.3

0.12

0.40

0.02B

0.08

WPL9

0.20

0.40-1.06

0.030

0.03

...

1.60-2.24



0.75-1.25



WPL3 C

0.20

0.31-0.64

0.05

0.05

0.13-0.37

3.2-3.8



...



WPL8 D

0.13

0.90

0.30

0.03

0.13-0.37

8.4-9.6



...



A When   fittings are of welded construction, the symbols above shall be supplemented   by the letter "W".

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

C Fittings   made from plate or forgings may have 0.90% max manganese.

D Fittings   made from plate may have 0.98% max manganese.

 

Available Dimension Range

OD   (mm/inch)

Wall thickness   (SCH)

10

20

30

STD

40

60

XS

80

100

120

140

160

XXS

21.3 (1/2'')






26.7 (3/4'')






33.4 (1'')






42.2 (1 1/4'')






48.3 (1 1/2'')






60.3 (2'')






73 (2 1/2'')






88.9 (3'')






101.6 (3 1/2'')








114.3 (4'')





141.3 (5'')







168.3 (6'')






219.1 (8'')

273 (10'')

323.8 (12'')

355.6 (14'')


406.4 (16'')


457 (18'')


508 (20'')


559 (22'')



610 (24'')







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