Heat treatment method for inlaid backup roll sleeve

A heat treatment method and backup roll technology, applied in heat treatment furnaces, heat treatment equipment, process efficiency improvement, etc., can solve the problems of roller sleeve scrapping, etc., and achieve the effects of improved wear resistance, reasonable distribution of residual stress, and high quenching temperature

Inactive Publication Date: 2016-05-04
SINOSTEEL XINGTAI MACHINERY & MILL ROLL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Some examples prove that after the forged roller sleeve is heated and quenched in a heat treatment furnace, it is assembled into an inlaid support roll, and a large number of axial stress cracks appear on the roller surface early, causing the roller sleeve to be scrapped in advance

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] The sleeve of the nested back-up roll of the present embodiment has chemical components and contents in its material as follows:

[0038] C: 0.48%, Si: 0.40%, Mn: 0.45%, P: 0.015%; S: 0.010%, Cr: 5.11%, Mo: 0.60%, V: 0.15%; the rest is Fe and unavoidable impurities.

[0039] In this embodiment, a heat treatment method for the sleeve of an inlaid back-up roll, the specification of the sleeve is φ1450×1524mm, and the hardness of the outer surface of the sleeve is required to be HSD65-70.

[0040] The method of heat treatment is specifically the following steps:

[0041] A. Steel ingots are smelted, and then the roll sleeve blank is forged, and the roll sleeve blank is subjected to rough machining and ultrasonic flaw detection.

[0042] B. Quenching and tempering the roll sleeve blank, heating the rough processed roll sleeve to a temperature of 920°C, and holding time for 6 hours; tempering the roll sleeve, heating temperature is 680°C, and holding time is 18 hours.

[0...

Embodiment 2

[0049] The sleeve of the nested back-up roll of the present embodiment has chemical components and contents in its material as follows:

[0050] C: 0.40%, Si: 0.2%, Mn: 0.2%, P: 0.025%; S: 0.025%, Cr: 4.5%, Mo: 0.5%, V: 0.1%; the rest is Fe and unavoidable impurities.

[0051] The heat treatment method of a kind of nested back-up roller sleeve of the present embodiment, specifically the following steps:

[0052] A. Steel ingots are smelted, and then the roll sleeve blank is forged, and the roll sleeve blank is subjected to rough machining and ultrasonic flaw detection.

[0053] B. Quenching and tempering the roll sleeve blank, heating the rough processed roll sleeve to a temperature of 900°C and holding time for 5 hours; tempering the roll sleeve at a heating temperature of 650°C and holding time for 15 hours.

[0054] C. Carry out semi-finishing processing and ultrasonic flaw detection on the roller sleeve.

[0055] D. Hoist the roller sleeve processed by the semi-finishing c...

Embodiment 3

[0060] The sleeve of the nested back-up roll of the present embodiment has chemical components and contents in its material as follows:

[0061] C: 0.60%, Si: 1.00%, Mn: 1.00%, P: 0.010%; S: 0.010%, Cr: 6.00%, Mo: 1.00%, V: 0.50%; the rest is Fe and unavoidable impurities.

[0062] The heat treatment method of a kind of nested back-up roller sleeve of the present embodiment, specifically the following steps:

[0063] A. Forging the blank of the roller sleeve, mixing various components to cast the blank of the sleeve of the inlaid backing roller, rough machining, and flaw detection.

[0064] B. Quenching and tempering the roller sleeve blank, quenching the roller sleeve with a power frequency power supply, the heating temperature is 950°C, and the holding time is 10 hours; tempering the roll sleeve, the heating temperature is 700°C, and the holding time is 30 hours.

[0065] C. Semi-finished car processing, flaw detection;

[0066] D. Hoist the blank of the inlaid support ro...

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Abstract

The invention discloses a heat treatment method for an inlaid backup roll sleeve. The heat treatment method comprises the following steps: A, smelting a steel ingot, and then forging a roll sleeve blank, followed by rough machining and flaw detection; B, performing hardening and tempering on the roll sleeve blank, heating the roughed roll sleeve, and performing tempering on the roll sleeve; C, performing semi-finish turning machining and flaw detection on the roll sleeve; D, hoisting the semi-finish turning machined roll sleeve to a power-frequency quench machining tool, carrying out overall induction heating by using a dual-power frequency power source, adopting a water quenching method; subsequently, carrying out tempering; E, detecting metallographic structures of inner and outer surfaces of the roll sleeve, and detecting residual stress and hardness of the outer surface; F, performing finish machining on the roll sleeve; and G, assembling a roll shaft, and performing finish machining on the assembled roll. The heat treatment method for the inlaid backup roll sleeve of the present invention meets the requirements in structure, hardness and residual stress aspects, and meanwhile, such properties as abrasive resistance and contact fatigue strength of the roll sleeve also are improved.

Description

technical field [0001] The invention relates to a heat treatment method for a roll sleeve, in particular to a heat treatment method for a sleeve of an inlaid back-up roll. Background technique [0002] After decades of development, especially in recent years, my country's large-scale steel rolling and aluminum rolling enterprises have undergone industrial upgrading, and their technical level and production capacity have been greatly improved. Modern strip mills are developing toward large-scale, high-speed, and automated directions, and the demand for large back-up rolls is rapidly increasing in quantity and quality. The effective use layer of the back-up roll is generally only about 50-150 mm of the hardened layer on the surface of the roll body. After repeated use, the back-up roll cannot continue to be used after reaching the scrap size and must be disposed of as waste. The actual effective use of the roll accounts for about 15% to 25% of the weight of the entire roll. ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21D1/25C21D1/42C21D9/40C21D6/00C22C38/02C22C38/04C22C38/18C22C38/12
CPCC21D1/25C21D1/42C21D6/002C21D6/005C21D6/008C21D9/40C22C38/02C22C38/04C22C38/12C22C38/18Y02P10/25
Inventor 崔聪聪韩维国苗金平
Owner SINOSTEEL XINGTAI MACHINERY & MILL ROLL
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