化学成分Chemical Compositions   ( max,  % )
钢级Grade
A WPB 
B,C,D,E,F
C 0.30
Mn 0.29-1.06
P 0.050
S 0.058
Si ≥0.10
Cr 0.40
Mo 0.15
Ni 0.40
Cu 0.40
V 0.08
A 当管配件为焊接结构时，上述级别号及标志号应添加字母“W”。When fittings are of welded construction, the grade and marking symbol shown above shall be supplemented by letter “W”.
B 由棒料或板料制成的管配件，含碳量最大可为0.35。Fittings made from bar or plate may have 0.35 max carbon.
C 由锻件制成的管配件，含碳量最大可为0.35，含硅量最大可为0.35，且无最小值限制。Fittings made from forgings may have 0.35 max carbon and 0.35 max silicon with no minimum.
D 当含碳量在规定的最大含碳量以下时，每降低0.01%碳，含锰量可在规定的最大含量以上递增0.06%，直至最大含锰量为1.35%。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 铜、镍、铬和钼的总含量总和应不超过1.00%。The sum of Copper, Nickel, Chromium, and Molybdenum shall not exceed 1.00 %.
F 铬和钼的总含量应不超过0.32%。The sum of Chromium and Molybdenum shall not exceed 0.32 %.
 
拉伸性能 Tensile Requirements
钢级Grade  WPB
 
 
 
抗拉强度范围Tensile strength, range ksi [MPa] 60–95
 [415–655]
最小屈服强度
Yield strength, min, ksi [MPa] (0.2 % offset or 0.5 % extension-under-load) 35 [240]
 
伸长率Elongation
延伸率Elongation: WPB
 纵向
Longitudinal 横向
Transverse
标距为4D的标准圆形试样或小尺寸比例试样的最小值Standard round specimen, or small proportional specimen, min % in 4 D 22 14
5/16inch（7.94mm）及其以上壁厚的矩形试样，和所有在全截面下试验的小尺寸试样，标距为2inch（50mm）
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
5/16inch（7.94mm）以下壁厚的矩形试样, 标距为2inch（50mm）（试样宽1/2inch，12.7mm）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 由板料制成的WPB和WPC管件最小延伸率为17%。WPB and WPC fittings manufactured from plate shall have a minimum elongation of 17 %.
 B 允许从上列伸长率值上，对于壁厚在5/16inch（7.94mm）以下的，每减薄1/32inch（0.79mm），纵向伸长率递减1.5%及横向伸长率递减1.0%。下表给出不同壁厚的最小值。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.
壁厚Wall Thickness WPB
in. [mm] 纵向
Longitudinal 横向
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 …
 
硬度 Hardness- 最高197HB