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 |
Ti |
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 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
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).