ASTM A860

ASTM A860 – Wrought High-Strength Low-Alloy Steel Butt-Welding Fittings

Grade: WPHY42  WPHY46  WPHY52  WPHY60  WPHY65  WPHY70

Chemical Compositions (max, %) Heat analysis

CMnPSSiNiCrMoCuTiVCbV+CbTi
0.201.00-1.450.0300.0100.15-0.400.500.300.250.350.050.100.040.120.06

1.The carbon equivalent as calculated by the follwing 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 chall not exceed 0.10% by heat analysis and 0.12% by product analysis.1.The carbon equivalent as calculated by the follwing formula, shall not exceed 0.42%:CE=C+Mn/6+(Cr+Mo+V)/5+(Ni+Co)/15.

3.The sum of Ni+Cr+Mo+Cu shall not exceed 1.0%.

 

Mechanical Requirements

PropertyGrade
WPHY 42WPHY 46 WPHY 52WPHY 60WPHY 65WPHY 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
252525202020
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].323232282828
Rectangular specimen for thickness less than 5⁄16 in. [7.94mm]; min, % 2 in. [50 mm]. Width of specimen 11⁄2 in. [40mm].BBBBBB

Toughness: Cv energy absorption C; measured at −50°F [−46°C].

Size, mmAverage/min, ft·lbs[J]Lateral Expansion min, MLS[mm]
10 × 1030/25 [40/34]25 [0.64]
10 × 7.525/21 [34/28]21 [0.53]
10 × 520/17 [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).