Small-caliber high-pressure oil pipe machining process

Abstract

The invention discloses a small-caliber high-pressure oil pipe machining process. 27 SiMn steel is used as a raw material and comprises, 0.12%-0.16% of C, 0.15%-0.50% of Si, 1.35%-1.55% of Mn, less than 0.02% of P, less than 0.01% of S, 0.04%-0.07% of V, 0.12%-0.35% of Ni, 0.05%-0.12% of Cr and 0.3%-0.6% of Nb, the outer diameter of a high-pressure oil pipe is 4-18 mm, and the inner diameter of the high-pressure oil pipe is 1.5-10 mm. The small-caliber high-pressure oil pipe machining process adopts a scientific machining method, precise cold rolling is performed, then annealing, precise cold drawing and normalization are performed to eliminate texture defects, enable texture to be thin and uniform and improve the plasticity and toughness of the steel pipe, a middle-temperature zinc-series phosphating and saponification are adopted, and higher deformation degree and deformation speed can be obtained with smaller pressure. The small-caliber high-pressure oil pipe produced by means of the small-caliber high-pressure oil pipe machining process has higher strength, toughness, plasticity and ductility, all indexes completely meet the requirements, and the oil pipe can bear large pressure, is free of cracks and can meet the oil supply demand of an automobile.

Description

technical field [0001] The invention belongs to the technical field of high-pressure oil pipes, and in particular relates to a processing technology of small-diameter high-pressure oil pipes. Background technique [0002] The seamless steel pipe has a hollow cross-section and is widely used as a pipe for conveying fluids. The seamless steel pipe is made of a steel ingot or a solid tube blank through perforation to make a capillary tube, and then hot-rolled, cold-rolled or cold-drawn. Steel pipes generally use small-diameter high-pressure oil pipes, and they must also withstand high pressure during use. The high-pressure oil pipes used today are generally less than 18mm in outer diameter and more than 4mm in diameter. Most of the existing products have poor toughness and are easy to break. Contents of the invention [0003] In order to solve the above problems, the invention discloses a processing technology of a small-diameter high-pressure oil pipe. The produced high-...

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Problems solved by technology

[0002] The seamless steel pipe has a hollow cross-section and is widely used as a pipe for conveying fluids. The seamless steel pipe is made of a steel ingot or a solid tube blank through perforation to make a capillary tube, and then hot-rolled, cold-rolled or cold-drawn. Steel pipes generally use small-diameter high-pressure oil pipes, and they must also withstand high pressure during use. The high-pressure oil pipes used today are generally less than 18mm in outer diameter and more than 4mm in diameter. Most of the existing products have poor toughness and are easy to break