化學成分Chemical Compositions   ( max,  % )
鋼級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 當管配件為焊接結(jié)構時，上述級別號及標志號應添加字母“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，含碳量最大可為0.35。Fittings made from bar or plate may have 0.35 max carbon.
C 由鍛件制成的管配件，含碳量最大可為0.35，含硅量最大可為0.35，且無最小值限制。Fittings made from forgings may have 0.35 max carbon and 0.35 max silicon with no minimum.
D 當含碳量在規(guī)定的最大含碳量以下時，每降低0.01%碳，含錳量可在規(guī)定的最大含量以上遞增0.06%，直至最大含錳量為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 銅、鎳、鉻和鉬的總含量總和應不超過1.00%。The sum of Copper, Nickel, Chromium, and Molybdenum shall not exceed 1.00 %.
F 鉻和鉬的總含量應不超過0.32%。The sum of Chromium and Molybdenum shall not exceed 0.32 %.
 
拉伸性能 Tensile Requirements
鋼級Grade  WPB
 
 
 
抗拉強度范圍Tensile strength, range ksi [MPa] 60–95
 [415–655]
最小屈服強度
Yield strength, min, ksi [MPa] (0.2 % offset or 0.5 % extension-under-load) 35 [240]
 
伸長率Elongation
延伸率Elongation: WPB
 縱向
Longitudinal 橫向
Transverse
標距為4D的標準圓形試樣或小尺寸比例試樣的最小值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試樣，和所有在全截面下試驗的小尺寸試樣，標距為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）以下壁厚的矩形試樣, 標距為2inch（50mm）（試樣寬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管件最小延伸率為17%。WPB and WPC fittings manufactured from plate shall have a minimum elongation of 17 %.
 B 允許從上列伸長率值上，對于壁厚在5/16inch（7.94mm）以下的，每減薄1/32inch（0.79mm），縱向伸長率遞減1.5%及橫向伸長率遞減1.0%。下表給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] 縱向
Longitudinal 橫向
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