1. As most pipe fittings are used for welding, in order to improve the welding quality, the ends are turned into grooves, with a certain angle and a certain edge. This requirement is also strict. The thickness of the edge, the angle and the deviation range are specified. The surface quality and mechanical properties are basically the same as those of pipes. For the convenience of welding, the steel grades of pipe fittings and connected pipes are the same.
2. All pipe fittings shall be subject to surface treatment. The oxide scale on the internal and external surfaces shall be shot blasted off and then coated with anti-corrosion paint. This is for export, and also for the convenience of transportation and prevention of corrosion and oxidation at home.
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