Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

Alloy steel 40Cr heat treatment method

A heat treatment method and alloy steel technology, applied in the field of heat treatment, can solve problems such as difficulty in inspection work, failure to mention heat preservation time and cooling time, non-conforming mechanical properties, etc., and achieve the effect of reducing scrap rate and production cost

Pending Publication Date: 2021-03-16
XINXING DUCTILE IRON PIPES CO LTD
View PDF2 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the specific holding time, cooling medium, and cooling time are not mentioned. The holding time, cooling medium, and cooling time can only be judged based on experience. However, in actual production, waste parts whose mechanical properties do not meet the standard requirements will be produced, which will cause serious damage to the inspection work. a lot of difficulty

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
  • Alloy steel 40Cr heat treatment method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0019] Below in conjunction with embodiment the present invention is described in further detail:

[0020] According to the standard GB / T 3077-2015, the recommended quenching temperature is (850±15)°C, and the initial quenching holding time is calculated according to τ=αkD, where α takes a value of 1.2~1.5min / ㎜, k takes a value of 4, and D is The effective thickness of the workpiece depends on the actual production, and the tempering temperature is (520±50)℃.

[0021] According to the adjustment of the initial holding time and temperature, the final quenching temperature is 865°C, the holding time is 90min, the tempering temperature is 470°C, and the holding time is 80min. The workpiece is heat treated as follows:

[0022] A. Quenching treatment: Process the alloy steel 40Cr into a sample blank with a diameter of 25mm, put it into a muffle furnace and heat it to 865°C for quenching, put 4 pieces each time, keep it warm for 90min, and cool it with a cooling medium for 10min, t...

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

PropertyMeasurementUnit
Tensile strengthaaaaaaaaaa
Yield strengthaaaaaaaaaa
Login to View More

Abstract

The invention discloses an alloy steel 40Cr heat treatment method. The method comprises the following steps: A, quenching treatment: putting workpieces made of alloy steel 40Cr into a muffle furnace,heating to 865 DEG C, quenching, conducting heat preservation for 90 minutes, and cooling for 10 minutes by adopting a cooling medium, wherein the diameter of the workpieces is 25 mm, and the four workpieces are loaded into the muffle furnace during each quenching treatment; and B, conducting tempering treatment: heating the workpieces to 470 DEG C to be tempered, conducting heat preservation for80 min, and cooling the workpieces to the room temperature through a cooling medium. The mechanical property indexes of the workpieces obtained through the heat treatment method all meet the standardrequirements.

Description

technical field [0001] The invention relates to a heat treatment method for alloy steel 40Cr, which belongs to the technical field of heat treatment. Background technique [0002] 40Cr steel is one of the most widely used steels in the machinery manufacturing industry. It belongs to medium carbon alloy quenched and tempered steel, cold heading die steel, and will have good comprehensive mechanical properties after quenched and tempered. Quenching and tempering is carried out according to the heat treatment recommended in the standard GB / T 3077-2015, but the standard only recommends that the quenching temperature is (850±15)°C, the coolant is oil, the tempering temperature is (520±50)°C, the coolant be water or oil. However, the specific holding time, cooling medium, and cooling time are not mentioned. The holding time, cooling medium, and cooling time can only be judged based on experience. However, in actual production, waste parts whose mechanical properties do not meet t...

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): C21D1/18C21D6/00C21D9/52
CPCC21D1/18C21D6/002C21D9/525
Inventor 张振东杨冉冉
Owner XINXING DUCTILE IRON PIPES CO LTD
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Patsnap Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Patsnap Eureka Blog
Learn More
PatSnap group products

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

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com