ASTM A860 High-Yield-Strength Butt Welding Pipe Fittings
ASTM A860 WPHY 52, WPHY 60, WPHY 65, WPHY 70 Pipe Fittings
ASTM A860 covers wrought high-strength ferritic steel butt-welding fittings of seamless and electric fusion-welded
construction. Dimensions of the fittings are provided in the latest revisions of ASME B16.9 and MSS-SP-75. Butt-welding fittings
differing from ASME B16.9 shall be furnished in accordance with Supplementary Requirement S58 of Specification A960/A960M.
These fittings are for use in high-pressure gas and oil transmission and distribution systems.
| Dimensions: | ANSI/ASME B16.9, B16.28, MSS-SP-75 |
| Thickness: | Sch 10, 20, 40, STD, 60, 80, XS, 100, 120, 140, 160 Sch XXS. |
| Specification – Grade: | ASTM A860 – MSS-SP-75 WPHY 42 / 46 / 52 / 56 / 60 / 65 / 70. |
| Type: | Seamless / Welded / Fabricated |
ASTM A860 Chemical Composition
The chemical composition of the steel shall conform to the requirements prescribed in Table 1
The fittings manufacturer shall make a product analysis per heat from either the starting material or from a fitting. The
chemical composition thus determined shall conform to Table 1 within the permissible variations included in Specification
A960/A960M. The product analysis shall be the basis for rejection. For referee purposes, Test Methods, Practices, and Terminology
A751 shall apply.
a860 WPHY42、WPHY46、WPHY52、WPHY60、WPHY65、WPHY70 has the same composition
ASTM A860 Tensile Requirements
1 The tensile properties of the fitting material shall conform to the requirements listed in Table 2.
2 Tension test specimens shall be taken from a fitting after final heat treatment or from a test piece of the same heat and nominal
thickness that was heat treated in a furnace charge with the fittings they represent.
3 One tensile test is required for each heat of fittings of the same section thickness, and heat treated in either a continuous or
batch-type furnace, controlled within a range of 50 °F [28 °C] and equipped with recording pyrometers
ASTM A860 Notch Toughness Properties
1.1The notch toughness properties of the fittings shall conform to the requirements listed in Table 2. The testing shall be
performed as specified in Specification A960/A960M. Full size Charpy, V-notch specimens shall be used whenever possible. Small
size specimens shall be used only when the material thickness does not permit full size specimens. The impact specimens shall
not be flattened after heat treatment. All base metal specimens shall be removed with the axis of the specimens longitudinal to the
direction of primary metal flow. Weld-metal specimens shall be specimens with the axis transverse to the weld seam.
1.2 One set of impact tests (three specimens) shall be made to represent the base metal and one set (three specimens) to represent
the weld metal on the same frequency as the tension tests.
1.3 The test temperature shall be −50 °F [−46 °C]
ASTM A860 Hardness Requirements
1.1 Fittings shall have a maximum hardness of 22 HRC (235 HBW).
2. Dimensions
2.1 Dimensional requirements for NPS 14 and smaller butt-welding fittings are provided in ASME B16.9.
2.2 Dimensional requirements for butt-welding fittings larger than NPS 14 through NPS 60 are provided in MSS-SP-75
ASTM A860 Heat Treatment
All fittings shall be furnished in the heat-treated condition. Fittings formed above the transformation temperature or upon
which welding is performed, shall be cooled to below the lower critical temperature prior to heat treatment. Fittings shall
subsequently be heat treated by normalizing, quenching, and tempering or stress relieving in accordance with Specification
A960/A960M.
