An Overview of ASTM A860 WPHY Gr 65 Elbows, Tees, and Reducers Introduction ASTM A860 is a standard specification for wrought high-strength ferritic steel butt-welding fittings. These fittings are typically used in high-pressure gas and oil transmission and distribution systems. The specification covers several grades, including WPHY 42, WPHY 46, WPHY 52, WPHY 60, WPHY