Water quenching and air cooling modified treatment technology of 42CrMo material

A process method, a quenching and tempering treatment technology, applied in the field of quenching and tempering treatment of 42CrMo materials, can solve problems such as unqualified tissue, large pollution, and prone to cold cracking, and achieve the goal of improving comprehensive performance, improving comprehensive performance, and preventing cold cracking Effect

Inactive Publication Date: 2009-02-11
SHANGHAI HEAVY MACHINERY PLANT
View PDF0 Cites 24 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] 42CrMo material is a commonly used metal material. The quenching and tempering process of this material generally includes: heating, heat preservation, quenching, high temperature tempering and other steps. The following problems are prone to occur during the quenching and tempering process: 1. Uneven hardness; 2. Quenching is easy Make the crack expand; 3. The organization is unqualified; 4. The comprehensive mechanical properties are unqualified
In order to avoid various quenching and tempering problems, 42CrMo quenching of large forgings usually uses oil quenching to improve its co

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Water quenching and air cooling modified treatment technology of 42CrMo material
  • Water quenching and air cooling modified treatment technology of 42CrMo material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0012] The 42CrMo product used in this embodiment is: product size: Φ930mm×17285mm, a long-axis forging with a weight of about 92 tons, and the material is 42CrMo.

[0013] Product ingredients, %

[0014] C mn Si S P Cr Mo Ni Cu 0.39 0.53 0.22 0.001 0.005 0.93 0.17 0.13 0.07

[0015] After rough machining, the product is arranged to be hoisted in the heat treatment workshop, and then quenched and tempered. Such as figure 2 Shown, the water-quenching air-cooling quenching and tempering treatment process of 42CrMo material of the present invention comprises the steps:

[0016] (1) Heating: 350°C isothermal for 120 minutes, after 360 minutes from 350°C to 650°C, at 650°C for 240 minutes, after 200 minutes from 650°C to 850°C;

[0017] (2) Heat preservation: 850°C isothermal for 570 minutes;

[0018] (3) Quenching: Use 5 cycles of water cooling and air cooling: after 22 minutes of water cooling, lift out the air-cooled buffer, wait for th...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

PUM

No PUM Login to view more

Abstract

The invention discloses a hardening and tempering and quenching treatment process of a large 42CrMo forged piece, which comprises the steps of heating up, heat preservation, quenching, high temperature tempering, etc. Quenching is carried out by a water quenching and air cooling method. The process comprises the following specific steps: when quenching, the forged piece is cooled in water for a certain time, and then is taken out for air cooling and buffer; when the surface temperature returns to 200-300 DEG C, the forged piece is put into water for water cooling again, and then is taken out for air cooling and buffer; after a plurality of cycles of water cooling and air cooling, the temperature of the forged piece is stable and not over 300 DEG C, the quenching process is completed. The treatment process provides the hardening and tempering scheme of the forged piece under the quenching condition without an oil groove, quenching oil, and the like, and improves the comprehensive properties of the forged piece.

Description

technical field [0001] The invention relates to a quenching and tempering treatment method of 42CrMo material, in particular to a water-quenching and air-cooling quenching and tempering treatment process method of 42CrMo material applied to large forgings. Background technique [0002] 42CrMo material is a commonly used metal material. The quenching and tempering process of this material generally includes: heating, heat preservation, quenching, high temperature tempering and other steps. The following problems are prone to occur during the quenching and tempering process: 1. Uneven hardness; 2. Quenching is easy Make the crack expand; 3. The organization is unqualified; 4. The comprehensive mechanical properties are unqualified. Usually for small 42CrMo materials, oil quenching or water quenching can be used to improve material properties. In order to avoid various quenching and tempering problems, 42CrMo quenching of large forgings usually uses oil quenching to improve it...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

Application Information

Patent Timeline
no application Login to view more
IPC IPC(8): C21D1/18C21D11/00
Inventor 吕政张琦陆寅松
Owner SHANGHAI HEAVY MACHINERY PLANT
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap