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Heat treatment method for wide-diameter H-shaped steel roll collar

A technology of H-beam and roll ring, applied in the field of roll ring manufacturing, can solve the problems of increasing the company's manufacturing cost, long production cycle, cracking of workpieces, etc., and achieve the effect of short temperature uniformity time, reduced equipment failure, and shortened time.

Inactive Publication Date: 2018-11-16
成都三强轧辊股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] For H-type roller rings with wide diameters (such as Φ1600), they have higher requirements for positive tempering heating in the heat treatment process, otherwise, during the heating process, due to excessive thermal stress and external force, it will occur in the heating stage of the heat treatment furnace. Before the phase change, the workpiece cracks and bursts, resulting in scrapping, increasing the company's manufacturing cost, and delaying time
[0004] Wide-diameter H-shaped roll rings (such as Φ1600) steel roll rings, in the past, domestic demand for this product was all dependent on imports, the price was high, and the production cycle was long

Method used

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  • Heat treatment method for wide-diameter H-shaped steel roll collar
  • Heat treatment method for wide-diameter H-shaped steel roll collar
  • Heat treatment method for wide-diameter H-shaped steel roll collar

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] A heat treatment process for a wide-diameter H-shaped steel roll ring, comprising the following steps:

[0034] (1) After the H-shaped steel roll ring is formed, heat the box and transfer to heat treatment;

[0035] (2) Heat the formed roller ring to 800°C at a heating rate of 40°C / h, and keep it warm for 10 hours to perform spheroidization treatment;

[0036] (3) Hang the roller ring heated in step (2) and air-cool it to 700°C, then air-cool it to 600°C, keep it warm for 2 hours, and cut the ring by cold work;

[0037] (4) With a heating rate of 30°C / h, heat the roller ring after step (3) air-cooled and heat-insulated to 1050°C, and keep it warm for 5 hours, and carry out high-temperature diffusion treatment;

[0038] (5) Cool the roller ring furnace after the high-temperature diffusion in step (4) to 440° C., and keep it warm for 2 hours.

[0039] (6) With a heating rate of 40° C. / h, the roller ring after step (5) furnace cooling and heat preservation is heated to 9...

Embodiment 2

[0048] A heat treatment process for a wide-diameter H-shaped steel roll ring, comprising the following steps:

[0049] (1) After the H-shaped steel roll ring is formed, heat the box and transfer to heat treatment;

[0050] (2) Heat the formed roller ring to 850°C at a heating rate of 45°C / h, and keep it warm for 12 hours to perform spheroidization treatment;

[0051] (3) Hang the roller ring heated in step (2) and air-cool it to 750°C, then air-cool it to 650°C, keep it warm for 2.5 hours, and cut the ring by cold work;

[0052] (4) At a heating rate of 35°C / h, heat the roller ring after step (3) air-cooled and heat-insulated to 1100°C, and keep it warm for 8 hours to perform high-temperature diffusion treatment;

[0053] (5) Cool the roller ring furnace after the high-temperature diffusion in step (4) to 450° C., and keep it warm for 2.5 hours.

[0054] (6) With a heating rate of 45° C. / h, the roller ring after step (5) furnace cooling and heat preservation is heated to 100...

Embodiment 3

[0063] A heat treatment process for a wide-diameter H-shaped steel roll ring, comprising the following steps:

[0064] (1) After the H-shaped steel roll ring is formed, heat the box and transfer to heat treatment;

[0065] (2) At a heating rate of 42°C / h, heat the formed roller ring to 825°C and keep it warm for 11 hours to perform spheroidization treatment;

[0066] (3) Hang the roller ring heated in step (2) and air-cool it to 725°C, then air-cool it to 625°C, keep it warm for 2.5 hours, and cut the ring by cold work;

[0067] (4) At a heating rate of 32° C. / h, heat the roller ring after step (3) air cooling and heat preservation to 1075° C., and keep it warm for 7 hours to carry out high temperature diffusion treatment;

[0068] (5) Cool the roller ring furnace after the high-temperature diffusion in step (4) to 460° C., and keep it warm for 3 hours.

[0069] (6) With a heating rate of 42° C. / h, the roller ring after step (5) furnace cooling and heat preservation is heated ...

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Abstract

The invention discloses a heat treatment method for a wide-diameter H-shaped steel roll collar and belongs to the technical field of roll collar manufacture. The heat treatment method has a technicalbreakthrough in wide-diameter H-shaped steel roll collar (phi 1600) manufacture and provides relevant manufacturing process parameters. The wide-diameter H-shaped steel roll collar has good hardness,core carbide and mechanical properties. The method comprises: spheroidization treatment and then cold cutting of the collar. Since the utilization rate of a blank is only 50 to 60%, after cold cutting, a large amount of a residual material and a protective layer are removed and the thickness of the workpiece is reduced so that the later high-temperature diffusion treatment process is promoted. Thetime of the existing high-temperature diffusion treatment process is 12h. After cold cutting of the collar, energy consumption of a large amount of residual materials is avoided, the energy consumption of high temperature diffusion is effectively reduced, the heat transfer effects are good, temperature equalization time is short, the time of high-temperature diffusion treatment is in 5-8h and isshortened by more than half, the diffusion is more complete and the quality of the matrix is good.

Description

technical field [0001] The invention belongs to the technical field of roll ring manufacturing, and in particular relates to a heat treatment process for a wide-diameter H-shaped steel roll ring. Background technique [0002] Roll collar is the main component of H-beam universal rolling mill. It is divided into two types: horizontal roll collar and vertical roll collar. With the development of national high-speed rail and the deepening of enterprise transformation, the The demand for steel, U-shaped steel, and bridge rails is increasing, and the demand for the number of roller rings for manufacturing steel is also gradually increasing. [0003] For H-type roller rings with wide diameters (such as Φ1600), they have higher requirements for positive tempering heating in the heat treatment process, otherwise, during the heating process, due to excessive thermal stress and external force, it will occur in the heating stage of the heat treatment furnace. Before the phase change, ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21D9/40C21D1/28C21D1/18
CPCC21D9/40C21D1/18C21D1/28
Inventor 付家双杨德明袁乐
Owner 成都三强轧辊股份有限公司
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