Title:
HIGH-FREQUENCY INDUCTION-BASED LOCAL TEMPERING HEAT TREATMENT METHOD FOR HIGH-NITROGEN STAINLESS BEARING STEEL
Document Type and Number:
WIPO Patent Application WO/2022/121565
Kind Code:
A1
Abstract:
The present invention relates to the technical field of heat treatment of materials, and provides a high-frequency induction-based local tempering heat treatment method for high-nitrogen stainless bearing steel. The high-nitrogen stainless bearing steel comprises the following components in percentage: C: 0.3-0.65%, Si≤1.0%, Mn≤1.0%, S≤0.015%, P≤0.025%, Cr: 14.5-16.0%, Mo: 0.85-1.10%, N: 0.2-0.5%, and the balance of Fe other than inevitable impurity elements. By performing overall quenching and tempering and high-frequency induction-based local tempering on the high-nitrogen stainless bearing steel, a threaded portion of a high-nitrogen stainless bearing steel part is locally softened after the heat treatment to meet the hardness requirement of 38-42 HRC; moreover, a raceway working surface maintains a high hardness of 58 HRC or above, thereby meeting use requirements of a bearing part. The present invention has the advantage that the problem of overall hardening of the high-nitrogen stainless bearing steel is solved, such that the high hardness of the raceway working surface is guaranteed, and the threaded portion has good matching of strength and toughness.
Inventors:
XU HAIFENG (CN)
CAO WENQUAN (CN)
YU FENG (CN)
WANG CUNYU (CN)
XU DA (CN)
WANG HUI (CN)
WENG YUQING (CN)
CAO WENQUAN (CN)
YU FENG (CN)
WANG CUNYU (CN)
XU DA (CN)
WANG HUI (CN)
WENG YUQING (CN)
Application Number:
PCT/CN2021/128425
Publication Date:
June 16, 2022
Filing Date:
November 03, 2021
Export Citation:
Assignee:
IRON AND STEEL RES INSTITUTE (CN)
International Classes:
C21D1/18; C21D1/10; C21D6/04; C22C38/02; C22C38/04; C22C38/18; C22C38/22
Foreign References:
| CN112708732A | 2021-04-27 | |||
| CN109055706A | 2018-12-21 | |||
| CN102010966A | 2011-04-13 | |||
| CN106636895A | 2017-05-10 | |||
| CN111893381A | 2020-11-06 |
Other References:
ZHENG TAO, FENG YU, JIATAO ZHANG, GUONENG WEI, DA XU: "Effects of heat treatment on microstructure and properties of high nitrogen stainless bearing steel G30", JINSHU RECHULI (2000), JINSHU RECHULI BIANJIBU, JP, vol. 38, no. 9, 30 September 2013 (2013-09-30), JP , pages 21 - 25, XP055942022, ISSN: 0254-6051, DOI: 10.13251/j.issn.0254-6051.2013.09.009
LI JIANLIN: "Local Heating Treatment of Insert Bearing Having Set Screws", BEARING, 30 November 2003 (2003-11-30), pages 15 - 17, XP055942025, ISSN: 1000-3762, DOI: 10.19533/j.issn1000-3762.2003.11.007
LI JIANLIN: "Local Heating Treatment of Insert Bearing Having Set Screws", BEARING, 30 November 2003 (2003-11-30), pages 15 - 17, XP055942025, ISSN: 1000-3762, DOI: 10.19533/j.issn1000-3762.2003.11.007
Attorney, Agent or Firm:
BEIJING GAOWO LAW FIRM (CN)
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