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Environmental Protection Cold Drawing Phosphating for Seamless Steel Pipe

2019-03-11 15:12:08   COMMENT:0 HITS:
  Seamless steel pipe is a kind of long steel with hollow section and no joint around it. Seamless steel pipe has hollow section, which is widely used as pipeline for conveying fluids, such as oil, natural gas, gas, water and some solid materials. Compared with solid steels such as round steel, Seamless steel pipe has lighter weight when its bending and torsional strength is the same. It is an economic section steel. It is widely used in manufacturing structural and mechanical parts, such as oil drill pipe, automobile transmission shaft, bicycle frame and steel scaffolding used in construction. Manufacturing ring parts with Round Section Carbon Steel Galvanized Seamless Steel Pipe can improve material utilization, simplify manufacturing process, save material and processing time, such as rolling bearing rings, Jack sleeves, etc. At present, Seamless steel pipes have been widely used in manufacturing. Seamless steel pipe is also an indispensable material for all kinds of conventional weapons. Tubes, barrels, etc. are made of steel pipe. Pipe can be divided into circular pipe and special-shaped pipe according to the shape of cross-section area. Because the circular area is the largest under the condition of equal circumference, more fluid can be transported by the circular pipe. In addition, when the ring section is subjected to internal or external radial pressure, the force is more uniform, so the vast majority of Seamless steel pipe are circular pipe.

  The rolling method of cold-drawn seamless steel pipe is more complicated than that of hot-rolled (extruded seamless steel tube). The first three steps of their production process are basically the same. The difference is that starting from the fourth step, after the round billet is emptied, it should be first annealed. After annealing, special acid liquids are used for pickling. After pickling, phosphating and oiling. Then followed by a number of cold-drawn (cold-rolled) billet tube, special heat treatment. After heat treatment, it will be straightened out. After straightening, the Seamless steel pipe is sent to metal flaw detector (or hydraulic test) by conveyor belt for internal flaw detection. If there are cracks and bubbles in the Seamless steel pipe, they will be detected. After the quality inspection of Seamless steel pipes, strict manual selection is required. After quality inspection of Seamless steel pipes, paint is sprayed with numbers, specifications, production batches, etc. The crane is hoisted into the warehouse.

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