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Unrestrained quenching machine and unrestrained quenching process for thin and wide plate

A quenching machine and constrained technology, applied in the field of heat treatment, can solve the problems of uneven cooling between contact position and non-contact position, poor uniformity of hardness on the upper surface of the steel plate, etc. The effect of large dosage

Pending Publication Date: 2020-11-10
SHANDONG IRON & STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The first purpose of the present invention is to overcome the technical problem of uneven cooling between the contact position and the non-contact position caused by the rolling contact between the upper roller table and the upper surface of the steel plate in the roll type quenching machine adopted in the prior art, and Propose an unrestrained quenching machine;
[0008] The second purpose of the present invention is to overcome the technical problem that the upper surface of the quenching machine must be rolled onto the upper surface of the steel plate to control the deformation in the rolling quenching process adopted in the prior art, resulting in poor uniformity of hardness on the upper surface of the steel plate. An unrestrained quenching process for thin and wide plates is proposed

Method used

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  • Unrestrained quenching machine and unrestrained quenching process for thin and wide plate
  • Unrestrained quenching machine and unrestrained quenching process for thin and wide plate
  • Unrestrained quenching machine and unrestrained quenching process for thin and wide plate

Examples

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Embodiment 1

[0060] An unrestrained quenching process for thin and wide plates, the steel plate to be quenched is a high-strength steel plate with a yield strength of 690MPa (Q690D), a thickness of 8mm, and a width of 3300mm, including the following steps:

[0061] (1) Shot blasting is performed on the steel plate before quenching, the speed of the shot blasting roller is 4.0m / min, and the diameter of the shot blasting shot is 1.0-1.4mm;

[0062] (2) Put the steel plate after shot blasting into the roller hearth continuous heat treatment furnace for heating, the heating temperature is 920°C, and the total time in the furnace is 16 minutes;

[0063] (3) Quenching treatment: the heated thin and wide plate enters between the upper roller table 3 and the lower roller table 2 of the quenching machine through the roller table, the speed of the quenching machine roller table is 12m / min, the roll gap is set to 8.4mm, and the There is a distance h between the upper surface of the thin and wide plat...

Embodiment 2

[0069] An unrestrained quenching process for thin and wide plates. The steel plate to be quenched is an NM400 wear-resistant steel plate with a thickness of 12mm and a width of 3700mm, including the following steps:

[0070] (1) Shot blasting is performed on the steel plate before quenching, the speed of the shot blasting roller is 4.0m / min, and the diameter of the shot blasting shot is 1.0-1.4mm;

[0071] (2) Put the steel plate after shot blasting into the roller hearth type continuous heat treatment furnace for heating, the heating temperature is 910°C, and the total time in the furnace is 28min;

[0072] (3) Quenching treatment: the heated thin and wide plate enters between the upper roller table 3 and the lower roller table 2 of the quenching machine through the roller table, the speed of the quenching machine roller table is 6m / min, the roll gap is set to 12.6mm, and the There is a distance h between the upper surface of the thin and wide plate and the lower surface of t...

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Abstract

The invention provides an unrestrained quenching machine. The unrestrained quenching machine comprises upper roller ways, lower roller ways and a lifting mechanism, the upper roller ways are arrangedat the upper portion of the quenching machine, the lower roller ways are symmetrically arranged below the upper roller ways, and a roller gap allowing a to-be-quenched plate to pass through is reserved between the upper roller ways and the lower roller ways; and the lifting mechanism is arranged at the upper roller ways and used for controlling lifting heights of the upper roller ways so as to adjust the height H of the roller gap, the height H of the roller gap is equal to the sum of the thickness h1 of the to-be-quenched plate and the distance h2 between the bottom surfaces of the upper roller ways and the upper surface of the to-be-quenched plate, and the h2 is greater than 0. According to the unrestrained quenching machine, the lifting heights of the upper roller ways are controlled through the lifting mechanism, so that the distance is reserved between the bottom surfaces of the upper roller ways and the upper surface of the to-be-quenched plate, the contact between the upper roller ways and the to-be-quenched plate is avoided, and the uniform quenching of the upper surface of the to-be-quenched plate can be realized.

Description

technical field [0001] The invention belongs to the field of heat treatment, and in particular relates to an unrestrained quenching machine and an unrestrained quenching process for thin and wide plates. Background technique [0002] Steel plate quenching is a key process to adjust the structure and properties of materials, and it is very important to control the properties and shape of wide and thick plate high-strength steel, wear-resistant steel, oil tank steel and other steel types. Roller quenching machine is the key equipment of the modern wide and thick plate heat treatment line. It has the advantages of high cooling strength and no soft spots on the surface of the quenched steel plate. It is widely used in the production of wide and thick plates. It is the key heat treatment for the development of high value-added and high-strength plate products. means. [0003] At present, major domestic steel mills also generally use roll quenching machines when producing thin an...

Claims

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Application Information

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IPC IPC(8): C21D1/667C21D9/46
CPCC21D1/667C21D9/46
Inventor 李涛于全成刘军刚冯文义谭维钰魏军广张长宏秦港邢长怀张梅李传鹏麻衡高海军李强
Owner SHANDONG IRON & STEEL CO LTD