Low-temperature rolling production method of high-performance 20CrMnTi gear steel

Abstract

The invention belongs to the field of special steel production machining of metallurgical industries and particularly relates to a low-temperature rolling production method of high-performance 20CrMnTi gear steel. With 20CrMnTi continuous casting slabs as raw materials, the method comprises the following working processes of heating, descaling, rough rolling, continuous rolling, water penetrationand cold rolling, finish rolling of a rod material sizing reduction unit and cooling through a cold bed in sequence, and finally a finished product rod material is obtained. According to the low-temperature rolling production method of the high-performance 20CrMnTi gear steel, the heating technical system of a heating furnace is optimized, the heating energy consumption is reduced, the productioncost is reduced, and the environment is protected; the high-performance 20CrMnTi gear steel is obtained, grain size control, rigidity control and mechanical property control over the high-performance20CrMnTi gear steel are superior than control in a common rolling technology, the metallographic structure of the high-performance 20CrMnTi gear steel is ferrite and pearlite, the rigidity is generally 170-220 HBW, the grain size of the high-performance 20CrMnTi gear steel is small and even, the grain size of the rolled round steel at least reaches 9.0 grade, and the comprehensive mechanical properties of the high-performance 20CrMnTi gear steel are superior than those of the common rolling technology.

Description

technical field [0001] The invention belongs to the field of special steel production and processing in the metallurgical industry, and relates to a rolling process, in particular to a low-temperature rolling production method of high-performance 20CrMnTi gear steel. Background technique [0002] In recent years, with the rapid development of my country's economy, my country's automobile manufacturing industry and machinery manufacturing industry have developed rapidly. In this context, the amount and variety of gear steel are also increasing, and the quality requirements for gear steel are gradually increasing. 20CrMnTi gear steel has mechanical properties such as good hardenability, excellent low-temperature impact toughness, and good fatigue resistance. 20CrMnTi gear steel has always been the leading variety of gear steel in my country, and is widely used in gears, shafts, and pistons in China. spare parts. [0003] The publication number is CN106755869A, and the patent t...

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Problems solved by technology

This paper specifically introduces the rolling process of combined steel, but does not specifically explain the temperature control and heating time of each heating section, and the steel type is ordinary combined steel, and does not mention the process production of gear steel

[0006] The existing technology has the following disadvantages for the 20CrMnTi rolling production method that reduces heating energy consumption: most iron and steel enterprises have not changed much in the heating process of 20CrMnTi gear steel, and adopt high-temperature heating (furnace temperature 1220-1280 ° C), high-temperature rolling Manufacturing method (rolling temperature 1150-1250 ℃), this process method not only wastes heating energy consumption, increases production cost, but also is not conducive to environmental protection. Sexuality is an inevitable trend in the future development of the steel industry

The main difficulties in adopting low-temperature heating and low-temperature rolling technology are: (1) The requirements for the anti-deformation ability of the main rolling mill equipment are high, and ordinary rolling mills are difficult to do; technology, its advantage is to improve the comprehensive mechanical properties of materials, but domestic iron and steel manufacturers are still in the groping stage

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