Forming of hot pressed carbon steel pipe cap

　　Hot pressed carbon steel pipe cap, pressure bearing parts of high pressure vessel and carbon steel hot pressed head need to be annealed after welding to eliminate welding stress. And first of all, we need to see what kind of carbon steel pipe cap is and the type of carbon steel pipe cap. According to the type of head, we need to carry out hot forming

　　Spherical head: small diameter head can be pressed, generally hot pressed. The manufacturing method of large diameter spherical tank is the same as that of spherical tank. Standard elliptical head and dished head: stamping and spinning are generally used. Because of the transportation problem, the discrimination method can be used. Cone: the small opening adopts stamping, and the large opening adopts spinning. After the production of carbon steel pipe cap, the inspection of carbon steel pipe cap model is an essential step. How to inspect carbon steel pipe cap? Firstly, the groove surface of large carbon steel head shall be free of cracks, delamination, inclusions and other defects.

　　The second is the lower limit of tensile strength; The groove surface of 540 MPa Steel plate and Cr Mo low alloy steel plate after flame cutting was smoothed by grinding wheel, and the machined surface was tested by magnetic particle or seepage. Thirdly, the offset B of the panel shall not be greater than the thickness of the steel δ。 The butt offset B of the splicing composite steel plate shall not be greater than 30% of the clad thickness of the steel plate, and shall not be greater than 1.0 mm. 6.2.5 welding procedure qualification before tailor welding shall be carried out according to JB4708-2000.