Hot-rolled round bar for high-pressure oil pipe and manufacturing method

Abstract

The present invention discloses a hot-rolled round bar for a high-pressure oil pipe and a manufacturing method of the hot-rolled round bar. The hot-rolled round bar comprises the following chemical components (smelting components) in percentage by mass (wt%): 0.10-0.17% of C, 0.25-0.45% of Si, 1.30-1.60% of Mn, less than or equal to 0.020% of P, less than or equal to 0.010% of S, 0.20-0.40% of Cr, 0.05-0.10 % of V, 0.025-0.050% of Al, less than or equal to 0.20% of Cu, less than or equal to 0.20% of Ni and the balance of iron and residual trace impurities. By virtue of controlling the appropriate ratio of each element in steel, and adopting heat treatment methods, such as EAF electric furnace smelting, LF refining and VD vacuum degassing, the structure of the hot-rolled round bar,with uniform fine sorbite and bainite metallographic structures, can be obtained and thus the hot-rolled round bar for the high-pressure oil pipe with the advantages of high pressure resistance, corrosion resistance and wear resistance is obtained.

Description

technical field [0001] The invention relates to a hot-rolled round steel for high-pressure oil pipes and a manufacturing method thereof. Background technique [0002] As we all know, the hydraulic oil pipe is the channel of the stained liquid of various construction machinery, and it is an indispensable part of every construction machinery. The hydraulic oil pipe connects the hydraulic components of the machine to ensure the circulation of the working fluid of the hydraulic system and the transmission and output of mechanical energy, so as to achieve the purpose of agile and flexible operation of various construction machinery. Hydraulic oil pipes are divided into low-pressure, medium-pressure and high-pressure. Existing high-pressure oil pipes generally use steel pipes, but ordinary steel cannot meet the requirements of high-pressure oil pipe steel for high-pressure resistance, corrosion resistance, and wear resistance. The prior art is badly in need of a high-pressure res...

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Problems solved by technology

Hydraulic oil pipes are divided into low-pressure, medium-pressure and high-pressure. The existing high-pressure oil pipes generally use steel pipes, but ordinary steel cannot meet the requirements of high-pressure oil pipe steel for high-pressure resistance, corrosion resistance, and wear resistance.

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