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Heat treatment quenching medium changed quenching and tempering treatment for low carbon low alloy steel

A quenching medium and low-alloy steel technology, applied in heat treatment equipment, quenching agent, manufacturing tools, etc., can solve problems such as instability and heat treatment quality fluctuations

Inactive Publication Date: 2014-05-07
JIANGSU LEAP MACHINE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, the heat treatment quality of this product has been fluctuating at the critical point of barely qualified and unqualified, which is very unstable.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0009] The quenching and tempering treatment of low-carbon and low-alloy steels that change the quenching medium for heat treatment includes the following steps:

[0010] 1. Forging: Forging 20CrMo into the required blank shape on the forging machine;

[0011] 2. Heat treatment: heat-treat the forged heat-treated blank in a water tank where the temperature is less than 35°C and the quenching medium is brine;

[0012] 3. Machining: process the processed blank into the required workpiece.

[0013] The present invention boldly innovates and reforms the old process of quenching and cooling firstly, adopts a fast and economical method of replacing quenching oil with water, accelerates the cooling speed of products, and greatly improves the amount of low-carbon M body obtained in the quenching process. In quenching and cooling, the monitoring of water temperature is strengthened, the adjustment of quenching water temperature is strengthened, and the adjustment of product outlet tem...

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PUM

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Abstract

The invention relates to heat treatment quenching medium changed quenching and tempering treatment for low carbon low alloy steel. The treatment includes the steps of: 1) forging; 2) heat treatment; and 3) machining. By means of the invention, a low carbon martensite can be obtained, and the sorbite transformed from the low carbon martensite during tempering can achieve the best good comprehensive mechanical properties. After passing through a physicochemical checkout room, visual metallography detection proves that the obtained workpieces fully meet the interior structure requirements, and the qualified rate of random sampling inspection is 100%.

Description

technical field [0001] The invention relates to heat treatment of low-carbon alloy steel, in particular to quenching and tempering treatment of low-carbon low-alloy steel using heat treatment quenching medium. Background technique [0002] For the quenching process of low-carbon and low-alloy steel, quenching oil is generally used to quench the product. The cooling rate of quenching oil is slow, and it is not easy to cause cracking of the product, but the internal structure is not completely transformed. The square roof forging produced by the applicant is made of 20CrMo, heat treated and tempered: HB=270-310, because the quenching process of this product generally uses quenching oil to quench the product, the quenching oil can barely meet the hardness requirement, and there is no Risk of cracking. Therefore, the heat treatment quality of this product has been fluctuating at the critical point of barely qualified and unqualified, which is very unstable. Contents of the in...

Claims

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Application Information

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IPC IPC(8): C21D1/25C21D1/60
Inventor 蒋波
Owner JIANGSU LEAP MACHINE