Manufacturing method of wear-resisting lining plate for rolling mill inlet guide

A wear-resistant lining, rolling mill technology, applied in metal material coating process, melt spraying, coating and other directions, can solve the problems of poor impact resistance, poor corrosion resistance, frequent replacement, etc., to improve strength and toughness, Good impact resistance and the effect of improving strength

Inactive Publication Date: 2015-10-21
HEFEI ORIENT METALLURGICAL EQUIP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] Aiming at the deficiencies in the prior art, the present invention provides a method for preparing a wear-resistant liner for a rolling mill inlet guide to solve the problem of severe wear, poor corrosion resistance, and impact resistance of the guide plate of the traditional rolling mill inlet guide during service. Problems such as short life and frequent replacement caused by poor performance

Method used

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  • Manufacturing method of wear-resisting lining plate for rolling mill inlet guide

Examples

Experimental program
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Effect test

Embodiment 1

[0036] Taking the preparation of a wear-resistant liner for a rolling mill entrance guide with a specification of 210×140×28 (unit: mm) as an example, this embodiment provides a method for preparing a wear-resistant liner for a rolling mill entrance guide. The method includes the following steps:

[0037] 1. Matrix preparation

[0038] Select a forged 40Cr steel plate with a production specification of 210×140×30 (unit: mm) (with a 2mm machining allowance on the bottom surface), and after quenching and tempering at high temperature, rough machine the surface of the steel plate to a roughness of Ra =12.5~6.3μm.

[0039] The quenching temperature range is 850°C±10°C, and the cooling method is oil cooling; the tempering temperature is 520°C±10°C, and the cooling method can be water cooling, oil cooling or air cooling.

[0040] Among them, the rough machining method is mechanical cutting, including rough turning, planing and milling.

[0041] 2. Degreasing and activation of the...

Embodiment 2

[0054] This embodiment provides a wear-resistant liner, comprising a base of forged 40Cr quenched and tempered steel and a wear-resistant layer welded on the base by flame spray welding, wherein the composition of the wear-resistant layer is as follows in terms of mass percentage: C~0.6%, Cr ~15%, Si~3%, W~5.5%, Nb~1.5%, Fe~4%, Mn~0.1%, Mo~0.1%, B1.5%, the balance is Ni.

Embodiment 3

[0056] For the wear-resistant liner in Examples 1 and 2, the forged 40Cr quenched and tempered steel (860°C quenching oil cooling + 520°C tempering oil cooling) wear-resistant liner of the same specification, the Cr12MoV steel (quenching + low temperature tempering) of the same specification Fire heat treatment) wear-resistant liner for mechanical performance test - including surface hardness test, wear test and impact toughness test (standard U-shaped sample, measured at 20 ℃). The experimental results are shown in Table 1 below:

[0057] The mechanical property test result of table 1 embodiment and comparative example

[0058]

[0059] It can be seen from the test results of mechanical properties that the comprehensive mechanical properties of the wear-resistant liner of the present invention are greatly improved compared with the traditional wear-resistant liner, not only has good toughness, but also has high surface hardness and excellent wear resistance.

[0060] It c...

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Abstract

The invention discloses a manufacturing method of a wear-resisting lining plate for a rolling mill inlet guide, and belongs to the field of a wear-resisting lining plate. The manufacturing method comprises the steps: step one, a substrate is manufactured; step two, the substrate is subjected to surface degreasing and activation; step three, the substrate is preheated; step four, flame spray welding is carried out; and step five, post processing is carried out. The substrate material in the invention is forging 40 Cr hardened and tempered steel, and the material of a spray welding layer is self-fluxed alloy powder. The wear-resisting lining plate has the advantages that the tenacity is excellent; the surface hardness is high; the abrasion performance is excellent; the service life of the wear-resisting lining plate is obviously prolonged; the production efficiency of a rolling mill and the product dimensional precision are ensured; the production cost is reduced; according to the characteristic of a flame spray welding technology, after the spray welding layer is worn, spraying and refusion can be carried out repeatedly; the abrasive resistance is equivalent to the abrasive resistance after first spray welding, so that the wear-resisting lining plate which loses efficacy can be easily repaired.

Description

technical field [0001] The invention relates to the field of preparation of wear-resistant liners, in particular to a method for preparing wear-resistant liners for rolling mill inlet guides. Background technique [0002] The inlet guide refers to the guide device installed in front of the roll pass or roll ring pass of the rolling mill to guide the rolled piece into the pass according to the predetermined direction and state during the online and bar rolling process. The inlet guide device includes the guide beam, the guide box, the base, the introduction part (including the inlet guide plate, the inlet pipe and the bell mouth, etc.), the cage, the support and other parts. In the inlet guide device, the inlet guide plate is one of the key control parts for the entry of the rolled piece, and its installation directly affects the production efficiency of the rolling mill during its service life. [0003] When the guide plate is working, it is in contact with the high-tempera...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C4/12C23C4/06C23C4/02C22C19/05
Inventor 赵家柱程玉凡张有德梁海峰吴迪
Owner HEFEI ORIENT METALLURGICAL EQUIP
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