For steel pipes without pre-treatment, the drawing coefficient cannot be carried out due to the excessive friction coefficient between the surface of the steel pipe and the mold during cold drawing; only after the pre-treatment process, the steel pipe is first derusted and treated by phosphating, saponification, etc. The inner and outer surfaces are formed into a dense metal soap film to reduce the friction between the steel pipe and the mold, thereby ensuring the smooth progress of the drawing. At the same time, the pre-treatment can also reduce the loss rate of the mold, improve the yield and work efficiency, and make the surface of the finished product smooth and uniform, and the anti-rust effect is good.
Precautions for steel pipes should pay attention to the following points:
(1) Pickling and rust removal should be thorough. Once it is found that the rust has not been removed, it needs to be pickled again.
(2) During production, the concentration of phosphating solution and saponification liquid should be tested frequently to ensure the production index of phosphating solution and saponification liquid. When it is found that the index is not reached, it should be timely formulated.
(3) The temperature and operating time of the treatment liquid should be strictly controlled.
Cangzhou Steel Pipe Group (CSPG) Co., Ltd
Cangzhou Steel Pipe Group (CSPG) Co., Ltd. is a large-sized, key metallurgic enterprise of Hebei Province in North China, whose history dates back to 1994. CSPG currently em/paces six member companies with products varying from SSAW, LSAW, ERW, seamless steel pipes to 3PE pipes, galvanized pipes, casing pipes, etc. A Joint-stock corporation, CSPG occupies an area of 600,000 square meters with a total asset of $530 million.
Specialized in the production of straight welded pipe spiral pipe galvanized pipe 3PE/3PP/FBE/TPEP internal and external epoxy powder internal and external epoxy resin cement mortar two cloth three oil buried pipeline IPN8710 non-toxic drinking water internal and external plastic coated lining plastic and other anti-corrosion pipe fittings for oil and gas pipeline water conservancy projects
Executive standard :DIN30670 DIN30678 CSA Z245 AFNOR nf49-710/711 NACE rp0394/0490 AWWAC 210/C213GB/T9711 API 5L ISO 3183Material: Q235B/Q355BGR A GR B x42-x80 l245-l555
Business scope: 21.3mm-3620mmLSAW submerged arc welded pipe 325-2020mmERW straight welded pipe 6mm-711mmSMLS seamless tube 10-1120mmSSAW spiral steel tube 219-3620mmDemand for quality suppliers and partners