Title:
CARBURIZED BEARING STEEL FOR LARGE-LOAD ROLLING MILL BEARING AND PRODUCTION METHOD THEREFOR
Document Type and Number:
WIPO Patent Application WO/2023/165068
Kind Code:
A1
Abstract:
The present invention relates to a carburized bearing steel for a large-load rolling mill bearing and a production method therefor. The steel comprises the following chemical components (in percentages by mass): C: 0.17-0.23, Si: 0.15-0.40, Mn: 0.30-0.60, Cr: 1.25-1.75, Mo ≤ 0.08, Ni: 3.25-3.75, Al: 0.01-0.05, P ≤ 0.020, S ≤ 0.015, Cu ≤ 0.20, Nb: 0.05-0.09, V: 0.07-0.13, Ca ≤ 0.0010, Ti ≤ 0.0015, O ≤ 0.0008, and the balance of Fe and inevitable impurities. The metallographic structure of the steel is bainite, and the grain size is larger than or equal to grade 5. The steel is molded by means of a production method, which comprises: continuously casting a large continuous casting billet via a CCM, slowly cooling same, heating and rolling same to form an intermediate billet, slowly cooling same, heating and rolling same to form a steel material, slowly cooling and annealing same, and then performing finishing. In the present application, the bainite structure of the steel material is finer and more uniform than that of an electroslag steel, and the production cost is lower, such that the market competitiveness of such a steel product is remarkably improved.
Inventors:
CHEN MIN (CN)
BAI YUN (CN)
YIN QING (CN)
WU XIAOLIN (CN)
LI WENBIN (CN)
LIU YE (CN)
HUA LIUKAI (CN)
BAI YUN (CN)
YIN QING (CN)
WU XIAOLIN (CN)
LI WENBIN (CN)
LIU YE (CN)
HUA LIUKAI (CN)
Application Number:
PCT/CN2022/105844
Publication Date:
September 07, 2023
Filing Date:
July 15, 2022
Export Citation:
Assignee:
JIANGYIN XINGCHENG SPECIAL STEEL WORKS CO LTD (CN)
International Classes:
C22C38/04; B22D11/00; C21C7/06; C21C7/10; C21D1/30; C21D6/00; C21D8/02; C22C33/06; C22C38/02; C22C38/06; C22C38/42; C22C38/44; C22C38/46; C22C38/48; C22C38/50
Domestic Patent References:
| WO2017146057A1 | 2017-08-31 |
Foreign References:
| CN107350445A | 2017-11-17 | |||
| CN102226253A | 2011-10-26 | |||
| CN109161658A | 2019-01-08 | |||
| CN107904498A | 2018-04-13 | |||
| CN111996437A | 2020-11-27 | |||
| US20210010116A1 | 2021-01-14 |
Attorney, Agent or Firm:
JIANGYIN QING ZHOU PATENT AGENCY (GENERAL PARTNERSHIP) (CN)
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