Brief Description Of Stainless Steel Pipe Processing And Production Technology

Drawing composite and mechanical expansion joint composite technology

       Due to its own process requirements, this method requires that the outer or inner pipe surface be round in order to fit the composite inner and outer tubes. However, due to the incompressibility of the transmission cable and insulating material, the electrically conductive drill pipe body will be inside There is a “slight convexity” in the cable fitting part, so the pull-out composite and mechanical expansion joint composite will cause damage to the insulation and performance of the cable, and the applicability is not strong.

       Hydrostatic hydraulic forced composite technology

       It means that high-pressure water is injected into the lining pipe. As the water pressure in the lining pipe increases, the lining pipe changes from an elastic deformation state to a plastic deformation state and is close to the outer pipe body. When the pressure inside the lining pipe reaches a certain value , the outer pipe body undergoes elastic deformation, causing the lining pipe and the outer pipe body to fit closely together. When the pressure on the lining pipe is removed, the outer pipe elastically recovers, and the lining pipe and the outer pipe body are closely connected to form a whole.

       Through molten iron pretreatment technology

       Desulfurization through molten iron pretreatment → Dephosphorization in 120t top and bottom double-blown converter → 120t top and bottom double-blown converter (decarburization) → LF → RH → Slab casting → Cold loading → 1500mm hot continuous rolling wide band into steel → Coiling, trial production Made of X80 pipeline steel hot-rolled wide strips. The test results show that: w(T(O)) in the X80 pipeline steel billet is 81×10-6, w(N) is 58×10-6, w(H)<1×10-6; the yield of the steel The strength (Rel) is 600~640MPa, the tensile strength (Rm) is 720~765MPa, the elongation (A) is 28.5%~31.5%, and the shear area ratio (SA) of the DWTT fracture of 60% of the sample is 40 %～60%.