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GCr15 high carbon chromium bearing steel on-line rapid spheroidizing annealing technology

A high-carbon chromium bearing steel, spheroidizing annealing technology, applied in the field of steel rolling, can solve the problems of long processing time, uneven carbide particles, affecting the microstructure and performance of cold processing and heat treatment, and achieve low cost, low equipment requirements, and shortened Effect of spheroidizing annealing cycle

Active Publication Date: 2015-02-04
UNIV OF SCI & TECH BEIJING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The processing time of this process is long (more than 20h), and the carbide particles are not uniform after annealing, which affects the structure and performance of subsequent cold working and final heat treatment

Method used

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  • GCr15 high carbon chromium bearing steel on-line rapid spheroidizing annealing technology
  • GCr15 high carbon chromium bearing steel on-line rapid spheroidizing annealing technology

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Embodiment Construction

[0016] The content of the present invention will be further specifically described below through specific examples in conjunction with the accompanying drawings. Such as figure 1 An online rapid spheroidizing annealing process for GCr15 high-carbon chromium bearing steel is shown. The microstructure of the hot-rolled piece after treatment is fine and uniform spherical carbides dispersed on the ferrite matrix.

[0017] The GCr15 high-carbon chromium bearing steel is processed through an online rapid spheroidizing annealing process, which specifically includes the following steps of heating and heat preservation, two-step rapid cooling and deformation, slow cooling, and rapid cooling:

[0018] 1. Heat up and keep warm. The GCr15 high-carbon chromium bearing steel was heated up to 1170°C at a heating rate of 10°C / s, and held at this temperature for 80 minutes. GCr15 high-carbon chromium bearing steel at 1170°C for high temperature insulation can ensure the melting of carbides a...

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Abstract

A GCr15 high carbon chromium bearing steel on-line rapid spheroidizing annealing technology belongs to the field of material engineering. The GCr15 high carbon chromium bearing steel comprises, by mass, 0.95-1.05% of C, 1.30-1.65% of Cr, 0.20-0.40% of Mn, 0.15-0.35% of Si, S<=0.015%, P<=0.02%, and the balance Fe. The technology comprises the following steps: heating to 1150-1250 DEG C along with the furnace temperature and keeping the temperature; rapidly cooling to 920-960 DEG C and applying stress to generate 40-60% of compression deformation; then rapidly cooling to 740-780 DEG C and generating 30-50% of compression deformation; then slowly cooling to 500-600 DEG C at a cooling speed of 0.3-0.5 DEG C / s; and finally rapidly cooling to room temperature. The technology is simple, after thermal deformation, the hot-rolled workpiece has the microstructure that fine uniform spherical carbides are dispersively distributed on ferrite matrix and is suitable for subsequent processing, and microstructure preparation work is provided for final quenching and tempering.

Description

Technical field: [0001] The invention belongs to the field of steel rolling and relates to an online rapid spheroidizing annealing process for hot-rolled rods and wires of GCr15 high-carbon chromium bearing steel. Background technique: [0002] The purpose of spheroidizing annealing is to obtain spheroidized structure, which has the best shape and the lowest hardness. After spheroidizing annealing, the distribution and shape of carbides can be modified to reduce the hardness of the material and improve the plasticity of the material. shape, reduce the deformation resistance of the material, improve the machinability, and prepare the tissue for subsequent heat treatment. [0003] GCr15 steel is the most widely used high-carbon chromium bearing steel. It is mainly used to make various bearing rings and rolling elements, and sometimes it is also used to make tools. It usually requires high strength, high elastic limit and high durability. Grinding etc. GCr15 bearing steel has...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21D6/00C21D8/00C22C38/18
Inventor 米振莉张小垒李辉李志超
Owner UNIV OF SCI & TECH BEIJING
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