Material Specifications for Butt-Welding Fittings (ASTM)
ASTM A234/A234M-00a
Piping Fittings of Wrought Carbon Steel and Alloy Steel for
Moderate and High Temperature Service
Grade | Composition, % | ||||||||||
C | Mn | P | S | Si | Cr | Mo | Ni | Cu | V | Nb | |
WPB(1)(2)(3)(4) | 0.30 | 0.29-1.06 | 0.050 | 0.058 | 0.1min | 0.40 | 0.15 | 0.40 | 0.40 | 0.08 | 0.02 |
WPC(1)(2)(3)(4) | 0.35 | 0.29-1.06 | 0.050 | 0.058 | 0.1min | 0.40 | 0.15 | 0.40 | 0.40 | 0.08 | 0.02 |
WP11 CL1 | 0.05-0.15 | 0.30-0.60 | 0.030 | 0.030 | 0.50-1.00 | 1.00-1.50 | 0.44-0.65 | - | - | - | - |
WP11 CL2 WP11 CL3 | 0.05-0.20 | 0.30-0.80 | 0.040 | 0.040 | 0.50-1.00 | 1.00-1.50 | 0.44-0.65 | - | - | - | - |
GENERAL NOTE:
All values are maximum unless otherwise indicated.
NOTES:
(1) For each reduction of 0.01% below the specified C maximum, an increase of 0.06%
Mn above the specified maximum will be permitted, up to a maximum of 1.35%.
(2) The sum of Cu, Ni, Cr, and Mo shall not exceed 1.00%.
(3) The sum of Cr and Mo shall not exceed 0.32%.
(4) The maximum carbon equivalent (C.E.) shall be 0.50, based on heat analysis and
the formula C.E.=C+Mn/6+(Cr+Mo+V)/5+(Ni+Cu)/15.
Tensile Requirements | WPB | WPC, WP11CL2 | WP11CL1 | WP11CL3 |
Tensile Strength, min, ksi[MPa] | 60-85 | 70-95 | 60-85 | 75-100 |
(0.2% offset or 0.5% extension-under-load) | [415-585] | [485-655] | [415-585] | [520-690] |
Yield Strength, min, ksi[MPa] | 32 | 40 | 30 | 45 |
[240] | [275] | [205] | [310] |
Wall thickness | Elongation Requirements | |||
in | mm | Longitudinal | Transverse | |
Standard round specimen, or small proportional specimen, min % in 4D | ³0.312 | ³7.94 | 22 | 14 |
Rectangular Specimen for wall thickness 0.312in [7.94mm] and over, and for all small sizes tested in full section; min % in 2in[50mm] | 30 | 20 | ||
Rectangular Specimen for wall thickness less than 0.312in [7.94mm]; min % in 2 in[50mm] (0.5in [12.7mm] wide specimen) | 0.281 | 7.14 | 28.5 | 19 |
0.250 | 6.35 | 27.0 | 18 | |
0.219 | 5.56 | 25.5 | - | |
0.188 | 4.76 | 24.0 | - | |
0.156 | 3.97 | 22.5 | - | |
0.125 | 3.17 | 21.0 | - | |
0.094 | 2.38 | 19.5 | - | |
0.062 | 1.59 | 18.0 | - |
Where the wall thickness lies between two values above, the min elongation value is determined by the following equations:
Longitudinal E=48t+15.00
Transverse E=32t+10.00
E = elongation in 2in [50mm], %
t = actual thickness of specimen, in [mm]