ASTM A860 – Wrought High-Strength Low-Alloy Steel Butt-Welding Fittings
Grade: WPHY42 WPHY46 WPHY52 WPHY60 WPHY65 WPHY70
Chemical Compositions (max, %) Heat analysis
| C | Mn | P | S | Si | Ni | Cr | Mo | Cu | Ti | V | Cb | V+Cb | Al |
| 0.20 | 1.00-1.45 | 0.030 | 0.010 | 0.15-0.40 | 0.50 | 0.30 | 0.25 | 0.35 | 0.05 | 0.10 | 0.04 | 0.12 | 0.06 |
1.The carbon equivalent as calculated by the following formula, shall not exceed 0.42%:CE=C+Mn/6+(Cr+Mo+V)/5+(Ni+Co)/15.
2.If vacuum carbon deoxidation is used, silicon shall not exceed 0.10% by heat analysis and 0.12% by product analysis.
3.The sum of Ni+Cr+Mo+Cu shall not exceed 1.0%.
Mechanical Requirements
| Property | Grade | |||||
| WPHY 42 | WPHY 46 | WPHY 52 | WPHY 60 | WPHY 65 | WPHY 70 | |
| Yield strength, minA 0.2 % offset, ksi [MPa] | 42 [290] | 46 [315] | 52 [360] | 60 [415] | 65 [450] | 70 [485] |
| Tensile strength, ksi [Mpa] | 60 [415] −85 [585] | 63 [435] − 88 [605] | 66 [455] − 91 [625] | 75 [515] − 100 [690] | 77 [530] − 102 [705] | 80 [550] −105 [725] |
| Elongation: Standard round specimen, or small-size proportional specimen, min, % in 4D | 25 | 25 | 25 | 20 | 20 | 20 |
| Rectangular specimen, for section thickness 5⁄16 in. [7.94mm] and over, and for all small sizes tested in full section; min, % in 2 in. [50 mm]. | 32 | 32 | 32 | 28 | 28 | 28 |
| Rectangular specimen for thickness less than 5⁄16 in. [7.94mm]; min, % 2 in. [50 mm]. Width of specimen 11⁄2 in. [40mm]. | B | B | B | B | B | B |
Toughness: Cv energy absorption C; measured at −50°F [−46°C].
| Size, mm | Average/min, ft·lbs[J] | Lateral Expansion min, MLS[mm] |
| 10 × 10 | 30/25 [40/34] | 25 [0.64] |
| 10 × 7.5 | 25/21 [34/28] | 21 [0.53] |
| 10 × 5 | 20/17 [27/23] | 13 [0.33] |
A) Actual yield strength shall not exceed specified minimum by more than 15 ksi [105 MPa].
B) For each 1⁄32-in. [0.79 mm] decrease in section thickness below 5⁄16 in. [7.94 mm], a deduction of 1.5 % from the elongation value of specimens above 5⁄16 in. [7.94mm] is permitted. When the section thickness lies between two values defined above, the minimum elongation value is determined by the following equation: E = 48t + 15.00
where: E = elongation % in 2 in. [50 mm], and t = actual thickness of specimen
C) These requirements are intended to minimize fracture initiation. The requirements are not intended to give assurance against fracture propagation.
Hardness Requirements
Fittings shall have a maximum hardness of 22 HRC (235 HB).
