Pressure quenching method of high-hardness 5Cr13MoV wearable liner

A wear-resistant lining plate and wear-resistant plate technology, applied in heat treatment equipment, furnaces, heat treatment furnaces, etc., can solve problems such as low service life and poor wear resistance, reduce deformation and cracking, and reduce quenching thermal stress and structure. Stress, the effect of increasing hardness

Active Publication Date: 2014-04-23
INNER MONGOLIA NORTH HEAVY INDS GROUP
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Problems solved by technology

[0004] The purpose of the present invention is to provide a pressure quenching method for a high-hardness 5Cr13MoV wear-resistant liner for the problems of poor wear resistance and low service life of the wear-resistant liner used in the archway of metallurgical machinery rolling mills at home and abroad. The method adopts pressure quenching heat treatment The technology effectively solves the technical problems of high-strength wear-resistant lining plate quenching warping deformation and quenching fracture, which significantly improves the service life of wear-resistant lining plate by more than 25%.

Method used

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  • Pressure quenching method of high-hardness 5Cr13MoV wearable liner

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Embodiment

[0018] Take the 5Cr13MoV and Q235 composite wear-resistant plate with a specification of 1000mm long × 1000mm wide × 45mm thick as an example:

[0019] Quenching is heated in a push rod heating furnace, the temperature of the workpiece entering the furnace is ≤870°C, the temperature is raised to 1030-1050°C and kept for 2.5h, and the furnace is cooled in the air for 110-130S, then enters the quenching press, and is covered with 5 meshes of 100×100×5mm Grid gasket, after pressing, immerse in 0.3% PAG (20-23°C) coolant, cool for 160-180S, take it out from the press, spray water on the convex surface to cool down to the wear-resistant plate surface temperature ≤ 40°C, and then put it in the air Let cool to room temperature.

[0020] Tempering is carried out in a trolley-type resistance furnace, heated to 200±10°C for 4 hours, and then air-cooled. After quenching treatment, the quenching hardness of the working face is ≥HRC56, the depth of the hardened layer is ≥5mm, the flatness...

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Abstract

The invention relates to a pressure quenching method of a high-hardness 5Cr13MoV wearable liner and belongs to the field of machine manufacturing. The method disclosed by the invention comprises the following steps: (1) air cooling 0.3% of PAG quenching agent, water cooling a convex surface, and carrying out multi-element cooling and quenching based on air cooling; (2) wherein the working surface of the wearable liner is a grid base plate of which the uniform thickness of the convex surface is 5mm, carrying out pressure quenching on a press machine according to a reversible deformation principle to counteract quenching deformation during quenching; after charging a work-piece, preheating before heating. A slow cooling mode is used in a high-temperature section and a low-temperature section, so as to reduce the quenching thermal stress and tissue pressure. The steel which is very sensitive to a 5Cr13MoV quenching crack is fully pre-cooled in air before being quenched, and cooled by using an ideal micro-deformation hardening agent 0.3% PAG in the quenching process. Thus, deformation and crack can be reduced, and the hardness also can be improved.

Description

Technical field: [0001] The invention relates to a pressure quenching method for a high-hardness 5Cr13MoV wear-resistant liner, which belongs to the field of mechanical manufacturing. Background technique: [0002] At present, the wear-resistant lining material commonly used on domestic metallurgical machinery and rolling mill archways is composed of 3Cr13 and Q235. The main problems are poor wear resistance and low service life. For this reason, many manufacturers at home and abroad are all seeking technical approaches to improve the service life of wear-resistant linings. [0003] In order to improve the service life of the wear-resistant lining plate of the archway of the metallurgical machinery rolling mill, the material of the working face is designed to be a new type of high-hardness wear-resistant material 5Cr13MoV stainless steel with more hardenability and wear resistance. Stainless steel is higher, so its wear resistance will be higher after quenching, and its ser...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21D1/18C21D9/00
Inventor 田君白笃张奇志张永涛高军马建清
Owner INNER MONGOLIA NORTH HEAVY INDS GROUP
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