High-frequency induction selective tempering heat treatment method for high-nitrogen stainless bearing steel

A heat treatment method and local tempering technology, applied in the direction of improving energy efficiency and process efficiency, can solve problems such as hardening of high nitrogen stainless bearing steel

Active Publication Date: 2021-04-27
CENT IRON & STEEL RES INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide a high-frequency induction local tempering heat treatment method for high-nitrogen stainless bearing steel, which solves the problem of overall hardening of high-nitrogen stainless bearing steel, not only ensures the high hardness of the raceway working surface, but also makes the thread Parts have good strength and toughness matching

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0014] (1) Overall hardening: high-nitrogen stainless bearing steel is hardened by quenching, cold treatment and two low-temperature tempering. 150°C, holding time 120 minutes.

[0015] (2) High-frequency induction tempering: The material processed in step (1) is subjected to induction partial tempering on a high-frequency induction numerical control quenching machine tool, the power frequency is 23KHz, the heating power is 25KW, the workpiece rotation speed is 280 rpm, and the heating temperature is about 750°C, air cooling after heating for 3s, continuous liquid spray cooling on the raceway surface, cooling water pressure 0.3MPa, water temperature 26°C.

[0016] (3) Low-temperature tempering: The material treated in step (2) is tempered at 150°C in a medium-temperature box furnace to eliminate internal stress generated during induction tempering. The final hardness of the raceway surface is above 58HRC, and the hardness of the thread part 42HRC.

Embodiment 2

[0018] (1) Overall hardening: high-nitrogen stainless bearing steel is hardened by quenching, cold treatment and two low-temperature tempering. 150°C, holding time 120 minutes.

[0019] (2) High-frequency induction tempering: The material processed in step (1) is subjected to induction local tempering on a high-frequency induction numerical control quenching machine tool, the power frequency is 25KHz, the heating power is 30KW, the workpiece rotation speed is 280 rpm, and the heating temperature is about 800°C, air cooling after heating for 4s, continuous liquid spray cooling on the raceway surface, cooling water pressure 0.3MPa, water temperature 26°C.

[0020] (3) Low-temperature tempering: The material treated in step (2) is tempered at 150°C in a medium-temperature box furnace to eliminate internal stress generated during induction tempering. The final hardness of the raceway surface is above 58HRC, and the hardness of the thread part 40HRC.

Embodiment 3

[0022] (1) Overall hardening: high-nitrogen stainless bearing steel is hardened by quenching, cold treatment and two low-temperature tempering. 150°C, holding time 120 minutes.

[0023] (2) High-frequency induction tempering: The material processed in step (1) is subjected to induction local tempering on a high-frequency induction numerical control quenching machine tool, the power frequency is 25KHz, the heating power is 30KW, the workpiece rotation speed is 280 rpm, and the heating temperature is about 800°C, air cooling after heating for 6s, continuous liquid spray cooling on the raceway surface, cooling water pressure 0.3MPa, water temperature 26°C.

[0024] (3) Low-temperature tempering: The material treated in step (2) is tempered at 150°C in a medium-temperature box furnace to eliminate internal stress generated during induction tempering. The final hardness of the raceway surface is above 58HRC, and the hardness of the thread part 38HRC.

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Abstract

The invention discloses a high-frequency induction selective tempering heat treatment method for high-nitrogen stainless bearing steel, and belongs to the technical field of material heat treatment. The high-nitrogen stainless bearing steel comprises the components in percentage by weight: 0.3-0.65% of C, less than or equal to 1.0% of Si, less than or equal to 1.0% of Mn, less than or equal to 0.015% of S, less than or equal to 0.025% of P, 14.5-16.0% of Cr, 0.85-1.10% of Mo, 0.2-0.5% of N, and the balance Fe, except unavoidable impurity elements. The high-nitrogen stainless bearing steel is subjected to overall quenching and tempering as well as high-frequency induction selective tempering, so that the thread part of a high-nitrogen stainless bearing steel part is locally softened after heat treatment, the hardness requirement of 38-42 HRC is met, meanwhile, the high hardness of 58 HRC or above is kept on the raceway working face, and the use requirement of the bearing part is met. The high-frequency induction selective tempering heat treatment method has the advantages that the problem of integral hardening of the high-nitrogen stainless bearing steel is solved, the high hardness of the raceway working surface is ensured, and the thread part has good strength and toughness in a matching mode.

Description

technical field [0001] The invention belongs to the technical field of material heat treatment, and in particular relates to a high-frequency induction local tempering heat treatment method for high-nitrogen stainless bearing steel. Background technique [0002] High-nitrogen stainless bearing steel adds 0.10-0.50% nitrogen to the medium-low carbon martensitic stainless steel, the microstructure and carbides are significantly refined, the size of carbonitrides in the steel is ≤15μm, and the grain size reaches above grade 8. The overall After quenching and tempering, the room temperature hardness is ≥58HRC. It has excellent properties such as high strength, high hardness, high wear resistance, high corrosion resistance and long life. It can be widely used in aerospace, precision machine tools, high-speed railways, nuclear power and oil drilling, etc. fields using bearings. [0003] Threaded bearing parts require the hardness of the raceway working surface to be ≥ 58HRC, and ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21D1/18C21D1/10C21D6/04C22C38/22C22C38/18C22C38/04C22C38/02
CPCC21D1/18C21D1/10C21D6/04C21D6/002C22C38/001C22C38/22C22C38/18C22C38/04C22C38/02Y02P10/25
Inventor 徐海峰曹文全俞峰王存宇许达王辉翁宇庆
Owner CENT IRON & STEEL RES INST
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