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Cryogenic treatment process of 9sicr die steel for railway wagons

A cryogenic treatment, railway freight car technology, applied in heat treatment equipment, heat treatment process control, manufacturing tools, etc., can solve the problems of metal fragmentation, physical properties, thermal properties and magnetic degradation, reduction of metal hardness, wear resistance and service life. , to achieve the effect of improving strength, small investment and improving service life

Inactive Publication Date: 2011-12-28
CRRC MEISHAN
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  • Application Information

AI Technical Summary

Problems solved by technology

When the metal is hardened from heat treatment to the cooling process, the alloy and carbon in it dissolve and combine and diffuse to form austenite (Austenite). The final transformation point (Mf) of martensite is very low, so a large amount of austenite will remain after quenching and cooling to room temperature, thus reducing the hardness, wear resistance and service life of the metal. Fragmentation, moreover, there are many physical properties, especially thermal properties and magnetic properties

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  • Cryogenic treatment process of 9sicr die steel for railway wagons
  • Cryogenic treatment process of 9sicr die steel for railway wagons
  • Cryogenic treatment process of 9sicr die steel for railway wagons

Examples

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Embodiment 1

[0023] This example adopts the cryogenic treatment process of the present invention.

[0024] Material preparation, take the convex and concave dies of the inclined wear plate blanking die and prepare for the process after the main mechanical forming is completed.

[0025] Spheroidizing annealing preheating treatment, the steps are: heat the workpiece to 790-810°C and keep it for 1-2 hours, then lower it to 700-720°C and keep it for 1 hour, then cool it to 550°C and take it out of the furnace for air cooling.

[0026] Quenching, heating the workpiece to 800-890°C for austenitization for 20-60 minutes, oil quenching, and then pre-tempering at 160-200°C for 1 hour;

[0027] Cryogenic treatment, using liquid nitrogen as the cryogenic medium, the cryogenic method is the gas method (also known as the dry cryogenic method), rapidly cooling from room temperature to -150~-190°C, keeping it warm for 24 hours or more, and then taking it out and placing it at room temperature Wait until...

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Abstract

The invention discloses a cryogenic treatment process of 9SiCr die steel for railway freight cars, which includes the steps of quenching, pre-tempering, cryogenic treatment and tempering. The combined cryogenic treatment scheme, especially the optimized treatment conditions for 9SiCr die steel for railway wagons, has a greater impact on the change of the material structure than the traditional treatment method, and can promote the transformation of part of the retained austenite into Martensite reduces the residual austenite; it can effectively improve the mechanical properties of the mold such as strength, hardness, toughness, and bending strength, thereby greatly improving the service life of the mold.

Description

technical field [0001] The invention belongs to the technical field of heat treatment process of metal materials, in particular to the cryogenic treatment process of 9SiCr die steel for railway wagons. Background technique [0002] Stamping parts are an important part of railway wagons. Their product quality and production efficiency directly affect the production and competitiveness of enterprises. In the production of stamping dies in my country and the world, the traditional manufacturing process is raw material blanking-annealing treatment-mechanical processing-final heat treatment- Finishing, where the final heat treatment is to make the mold reach the performance, and the traditional process of final heat treatment is quenching + low temperature tempering. [0003] The final heat treatment adopts the traditional treatment process. The mold has high strength and hardness, but the toughness is low. In actual production, problems such as fracture and wear often occur, whic...

Claims

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Application Information

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IPC IPC(8): C21D6/04C21D11/00
Inventor 钱梁杨鸣张志昌朱进华何世元董立新周有龙康海军张森林
Owner CRRC MEISHAN
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