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ASTM A234 WP22

Time:2020-01-27 Click:385

ASTM A234 Standard Specification for Piping Fittings of Wrought Carbon Steel and Alloy Steel for Moderate and High Temperature Service

 

Grade: WP22

 

Chemical Composition, %

Grade

WP22 CL1

WP22 CL3

C

0.05-0.15

 

Mn

0.30-0.60

 

P

0.040

 

S

0.040

 

Si

≤0.50

 

Cr

1.90-2.60

 

Mo

0.87-1.13

 

 

Tensile Requirements

Grade

WP22 CL1

WP22 CL3

Tensile strength, MPa

415–585

520-690

Yield strength, min MPa

205

310

 

Elongation Requirements

Elongation:

WP22 CL1, CL3

Longitudinal

Transverse

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

22

14

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. [50 mm]

30

20 A

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

B

B

A Fittings manufactured from plate shall have a minimum elongation of 17 %.

B For each 1⁄32 in. [0.79 mm] decrease in wall thickness below 5⁄16 in. [7.94 mm], a deduction of 1.5 % for longitudinal and 1.0 % for transverse from the values shown above is permitted. The following table gives the minimum value for various wall thicknesses.

 

Wall Thickness

WP22 CL1, CL3

in.

[mm]

Longitudinal

Transverse

5⁄16 (0.312)

7.94

30

20

9⁄32 (0.281)

7.14

28.5

19

1⁄4 (0.250)

6.35

27

18

7⁄32 (0.219)

5.56

25.5

3⁄16 (0.188)

4.76

24

5⁄32 (0.156)

3.97

22.5

1⁄8 (0.125)

3.17

21

3⁄32 (0.094)

2.38

19.5

1⁄16 (0.062)

1.59

18

This table gives the computed minimum % elongation value for each 1⁄32 in. [0.79 mm] decrease in wall thickness. Where the wall thickness lies between two values above, the minimum elongation value is determined by the following equations:

Direction of Test

Equation

Longitudinal

E= 48t + 15.00

Transverse

E= 32t + 10.00

where:

E = elongation in 2 in. or [50 mm], %, and

t = actual thickness of specimen, in. [mm].

 

Hardness: ≤197 HB

 

Heat treatment:

Fittings of Grades WP22 Class 1, WP22 Class 3 shall be furnished in the full-annealed, isothermal-annealed, or normalized and tempered condition. If normalized and tempered, the tempering temperature shall not be less than 1250°F [675 °C].

 

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