Manufacture of Butt Weld Fittings
Fittings may be made from forgings, bars, plates, or seamless or welded tubular products, provided the materials conform to the chemical composition requirements of ASTM A240.
The steel may be melted by electric- furnace, or vacuum-furnace, or by either of these followed by vacuum or electroslag- consumable remelting.
Fittings may be formed by hammering, pressing, piercing, extruding, upsetting, rolling, bending, fusion welding, machining or any combination of these processes.
All fittings are heat treated in accordance with the heat treatment table. All welding must be done prior to heat treatment.