A860/860M: American Society for Testing and Materials
Wrought High-Strength Ferritic Steel Butt-Welding Fittings
Scope: These fttings are for use in high-pressure gas and oil transmission and distribution systems.

Chemical Composition
	Composition %
	Heat Analysis
Carbon	0.2
Manganese	1.00–1.45	All values are maximum unless a range is stated
Phosphorus	0.03
Sulfur	0.01
Silicon	0.15–0.40
Nickel	0.5
Chromium	0.3
Molybdenum	0.25
Copper	0.35
Titanium	0.05
Vanadium	0.1
Columbium	0.04
Vanadium plus	0.12
Columbium
Aluminum	0.06

Mechanical Properties
Property				Grade
	WPHY 42	WPHY 46	WPHY 52	WPHY 60	WPHY 65	WPHY 70
Yield strength, min 0.2 % offset, ksi [MPa]	42 [290]	46 [315]	52 [360]	60 [415]	65 [450]	70 [485]
Tensile strength, ksi [MPa]	60 [415]	63 [435]	66 [455]	75 [515]	77 [530]	80 [550]
	−85 [585]	− 88 [605]	− 91 [625]	− 100 [690]	− 102 [705]	−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; 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]

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. [7.94 mm] 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.

1.1This specification covers wrought high-strength ferritic steel butt-welding fittings of seamless and electric fusion-welded construction covered by the latest revisions of ASME B16.9 and MSS-SP-75. Butt-welding fittings differing from these ASME and MSS standards shall be furnished in accor-dance with Supplementary Requirement S58 of specification A960/A960M. These fittings are for use in high-pressure gas and oil transmission and distribution systems.
1.2Optional supplementary requirements are provided for fittings when a greater degree of examination is desired. One or more of the supplementary requirements may be specified in the order.
1.3This specification does not cover cast-welding fittings or fittings machined from castings.