Steel pipe fittings heat treatment should be in accordance

　　Steel pipe fittings heat treatment should be in accordance with the provisions of the corresponding material system, and heat treatment process records, heat treatment needed for metallographic analysis and hardness testing. Mechanical properties after heat treatment and other requirements, ASTM A105 Mss Sp-97Weld Outlets should be consistent with the provisions of the corresponding material standards.The inner and outer surfaces of pipe fittings shall be smooth and shall not have defects such as scratches, cracks, pull marks, heavy skin, sticky sand and splash.