Method for manufacturing alloy steel pipe for micro-decarburization high-strength highly abrasion-resistant cylinder sleeve

Abstract

The invention discloses a method for manufacturing an alloy steel pipe for a micro-decarburization high-strength highly abrasion-resistant cylinder sleeve, which can improve the quality of a finished pipe for the cylinder sleeve. The method comprises the following steps: (1) conducting acid cleaning, honing, polishing and head making on a pipe blank in sequence; (2) conducting phosphating and saponification on the pipe blank in sequence, and then drawing the pipe blank for the first time, wherein the reduction amount of wall thickness of the pipe blank is controlled within 1 mm during drawing; conducting thermal refining on the pipe blank, conducting acid cleaning, phosphating and saponification on the pipe blank in sequence, and drawing the pipe blank for the second time to a required size so as to finish draw forming, the reduction amount of wall thickness of the pipe blank is controlled within 2-3 mm during drawing; (3) conducting aging thermal treatment, straightening and micro-polishing on the drawing-formed pipe blank in sequence. The method is especially suitable for manufacturing the pipe for the cylinder sleeve with a 27SiMn alloy steel pipe.

Description

technical field [0001] The invention relates to a manufacturing process of alloy steel pipes, in particular to a method for manufacturing alloy steel pipes for micro-decarburized high-strength and high-wear-resistant cylinder liners. Background technique [0002] The cylinder liner (also known as the cylinder barrel) of the hydraulic cylinder is usually made of high-quality carbon structural steel or alloy structural steel. According to the characteristics of metal materials, high-quality carbon structural steel can meet the requirements of cylinder liners by adopting stress relief or normalizing heat treatment process, while for alloy structural steel, when hydraulic mechanical equipment works in extremely harsh environments, the comprehensive performance index It is particularly important and directly determines the occurrence probability of failure modes of hydraulic mechanical equipment. Therefore, the cylinder liner is required to have a series of stringent technical i...

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Problems solved by technology

However, quenching and tempering treatment is a high-temperature heat treatment process. During high-temperature quenching, due to the instantaneous thermal expansion and contraction caused by the rapid cooling of the cooling medium and the residual stress of the steel pipe itself due to cold working, the original geometrically accurate steel pipe after quenching and tempering Severe deformation will occur, the surface roughness will decrease, and oxide scales and pits will appear on the surface, which will directly affect the utilization rate of metal materials

Alloy steel pipes for cylinder liners will be deformed after quenching and tempering, which has always been a technical bottleneck that the international heat treatment industry cannot break through. It can only be moderately controlled, and cannot be fundamentally eliminated and avoided.

Therefore, from a macro point of view, the quenched and tempered alloy steel pipe has considerable advantages in performance indicators and can meet the work requirements of the cylinder liner. However, from the perspective of metal material utilization, cylinder liner production efficiency and energy consumption, etc. It is a huge obstacle to the development of sets of production enterprises, and it runs counter to the direction of national industrial development and transformation and upgrading

[0004] In addition, due to congenital defects such as pockmarks, pits, warped skins, etc. on the inner and outer surfaces of the prototype tube blank, as well as subtle defects that are difficult to find with the naked eye, it is difficult to guarantee the concentricity of the wall thickness of the tube blank from the root. In the method, it is directly drawn, which has an adverse effect on the quality, yield and material utilization of the tube for the finished cylinder liner

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