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High-hardenability quenched and tempered steel heat treatment method

A heat treatment method and high hardenability technology, applied in the field of heat treatment of metal materials, can solve the problems of low oil quenching efficiency, uneven hardness, cracking, etc.

Active Publication Date: 2015-04-29
湖南高致精工机械有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The traditional heat treatment process adopts quenching + high temperature tempering to obtain the tempered sorbite structure. However, in the quenching process, the high hardenability quenched and tempered steel parts with complex structures are prone to deformation, cracking and other problems. Different products And the same product has uneven hardness, and the oil quenching efficiency is low, the environment is poor, and the cost is high

Method used

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Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0007] Embodiments of the present invention adopt following technological process:

[0008] 1. The bar after blanking is heated by an intermediate frequency electric furnace, and the heating temperature is controlled at 1050~1150°C. It is measured and controlled by an infrared thermometer, and then it is preformed, forged, finished, and trimmed. After trimming, the temperature of the product is controlled between 850°C and 900°C.

[0009] 2. Scatter and stack the edge-trimmed products, and use exhaust fans to cool the products. Only when the temperature of the products is lower than 200°C can they be collected in the loading basket and enter the next process. The hardness is controlled between 36~42HRC.

[0010] 3. Put the air-cooled product into a box-type resistance furnace for heating. The heating temperature is controlled at 730-750°C, the holding time is controlled at 2 hours, and it is air-cooled after being released from the furnace.

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Abstract

The invention relates to a heat treatment method of machining, and especially relates to a heat treatment method of high-hardenability quenched and tempered steel. The invention aims at solving a technical problem of providing a heat treatment method for avoiding high-hardenability quenched and tempered steel part deformation and cracking. The method comprises the process flow comprising the steps that: rod materials are subjected to intermediate frequency furnace heating, performing, forging and shaping, trimming, and edge cutting; the cut product are stacked in a scattered manner; when the temperature of the products is lower than 20 DEG C, high-temperature tempering is carried out, wherein a heating temperature is controlled at 730-750 DEG C; a temperature maintaining time is controlled at 2h; and the rods are fetched and air-cooled. With the technical scheme, the products can be provided with substantially 100% uniform tiny sorbite structures. Also, quenching processes are reduced, such that phenomena of deformation, cracking, and the like are avoided. Production cost is reduced, product quality is improved, and production efficiency is improved.

Description

technical field [0001] The invention relates to a heat treatment method for metal materials, in particular to a heat treatment method for quenched and tempered steel with high hardenability. Background technique [0002] Quenched and tempered steel generally belongs to medium carbon steel, and the carbon content range is controlled within the range of 0.25-0.5%, while high hardenability quenched and tempered steel belongs to multi-component alloy structural steel, and the critical hardening diameter of oil quenching is greater than 60~100mm. The traditional heat treatment process adopts quenching + high temperature tempering to obtain the tempered sorbite structure. However, in the quenching process, the high hardenability quenched and tempered steel parts with complex structures are prone to deformation, cracking and other problems. Different products And the same product has uneven hardness, and the oil quenching efficiency is low, the environment is poor, and the cost is ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C21D1/25
Inventor 刘均沈运海沈祁阳蒲焕章
Owner 湖南高致精工机械有限公司