ASTM A234

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

Chemical Compositions   ( max,  % )

Grade and Marking Symbol A

C

MnPSSiCrMoNiCu

V

WPB B,C,D,E,F

0.3

0.29-1.060.0500.058≥0.100.400.150.400.40

0.08

WPC C,D,E,F

0.35

0.29-1.060.0500.058≥0.100.400.150.400.40

0.08

WP1

0.28

0.30-0.900.0450.0450.1-0.50.44-0.65

..

WP12 CL1

0.05-0.20

0.30-0.800.0450.0450.60  0.8-1.250.44-0.65

WP11 CL10.05-0.150.30-0.600.0300.0300.5-1.0   1.0-1.50.44-0.65
WP11 CL2

0.05-0.20

0.30-0.800.0400.0400.5-1.0   1.0-1.50.44-0.65

WP22 CL1

0.05-0.15

0.30-0.600.0400.0400.50   1.9-2.60.87-1.13

WP5  CL1

0.15

0.30-0.600.0400.0300.50   4.0-6.00.44-0.65

WP9  CL1

0.15

0.30-0.600.0300.0301.008.0-10.00.90-1.10

WPR

0.2

0.40-1.060.0450.0501.6-2.240.75-1.25
WP91

0.08-0.12

0.30-0.600.0200.0100.20-0.508.0-9.50.85-1.050.40

0.18-0.25

Others:    Cb:0.06-0.1, N:0.03-0.07,  Al:0.02 G , Ti:0.01 G,  Zr:0.01 G
WP911

0.09-0.13

0.30-0.600.0200.0100.10-0.508.0-9.50.90-1.100.40

0.18-0.25

Others:  Cb:0.06-0.1,  N:0.04-0.09,  Al:0.02 G,  B:0.0003-0.006,  W:0.9-1.1,  Ti:0.01 G,  Zr.0.01 G

 

A When fittings are of welded construction, the grade and marking symbol shown above shall be supplemented by letter “W”.
B Fittings made from bar or plate may have 0.35 max carbon.
C Fittings made from forgings may have 0.35 max carbon and 0.35 max silicon with no minimum.
D For each reduction of 0.01 % below the specified carbon maximum, an increase of 0.06 % manganese above the specified maximum will be permitted, up to amaximum of 1.35 %.
E The sum of Copper, Nickel, Chromium, and Molybdenum shall not exceed 1.00 %.
F The sum of Chromium and Molybdenum shall not exceed 0.32 %.
Applies both to heat and product analyses.

 

Tensile Requirements

Grade and Marking SymbolWPBWPC,
WP11 CL2,
WP12 CL2
WP1WP11 CL1,
WP22 CL1,
WP5 CL1
WP9 CL1
WPRWP11 CL3,
WP22 CL3
WP5 CL3
WP9 CL3
WP91WP911WP12 CL1
Tensile strength, range ksi [MPa]60–95
[415–655]
70–95
[485–655]
55–80
[380–550]
60–85
[415–585]
63–88
[435–605
75–100
[520–690]
85–110
[585–760]
90–120
[620–840]
60–85
[415–585]
Yield strength, min, ksi [MPa] (0.2 % offset or 0.5 % extension-under-load)35 [240]40 [275]30 [205]30 [205]46 [315]45 [310]60 [415]64 [440]32 [220]
Elongation:All Grades except WPR,WP91, and WP911WPRWP91, WP911
LongitudinalTransverseLongitudinalTransverseLongitudinalTransverse
Standard round specimen, or small proportional specimen, min % in 4 D22142020
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]
3020 A28
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)
BBB

A WPB and WPC 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 ThicknessAll Grades except WPR,WP91, and WP911WPRWP91, WP911
in.[mm]LongitudinalTransverseLongitudinalLongitudinal
5⁄16 (0.312)7.9430202820
9⁄32 (0.281)7.1428.51926.519
1⁄4 (0.250)6.3527182518
7⁄32 (0.219)5.5625.523.517
3⁄16 (0.188)4.76242216
5⁄32 (0.156)3.9722.520.515
1⁄8 (0.125)3.17211914
3⁄32 (0.094)2.3819.517.513
1⁄16 (0.062)1.59181612

Note—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].