Title:
STEEL FOR INNER RACEWAY OF CONSTANT VELOCITY UNIVERSAL JOINT AND PRODUCTION METHOD THEREFOR
Document Type and Number:
WIPO Patent Application WO/2022/160536
Kind Code:
A1
Abstract:
The present invention relates to steel for inner raceway of a constant velocity universal joint and a production method therefor. The steel comprises the following chemical components in percentage by weight (wt%): 0.15-0.25% of C, 0.01-0.15% of Si, 0.25-0.75% of Mn, 0.80-1.30% of Cr, 0.001-0.003% of B, 0.010-0.040% of Ti, less than or equal to 0.015% of S, less than or equal to 0.025% of P, less than or equal to 0.25% of Ni, less than or equal to 0.20% of Mo, less than or equal to 0.30% of Cu, less than or equal to 0.05% of Al, less than or equal to 0.0010% of Ca, less than or equal to 0.0010% of O, less than or equal to 0.04% of As, less than or equal to 0.03% of Sn, less than or equal to 0.005% of Sb, and less than or equal to 0.002% of Pb, with the balance being Fe and inevitable impurities. The production process comprises primary smelting, refining, vacuum degassing, continuous casting, continuous rolling, annealing, and finishing. The hardness of the steel is less than or equal to 80 HRB; a microscopic structure is ferrite and pearlite; the austenite grain size of the steel is greater than or equal to 6 grade; the banded structure of the steel is graded according to GB/T 13299 and does not exceed 2.0 grade. The hardenability of the tail end of the steel is evaluated according to a GB/T 225 method, and the hardenability of the J5 point is 36-44 HRC, and the hardenability of the J13 point is 24-32 HRC. The steel for the inner raceway of the constant velocity universal joint belongs to novel carburized steel for a universal joint inner raceway, and meets the hardenability, wear resistance, and cold forging performance of the steel for the universal joint inner raceway.
Inventors:
CHEN MIN (CN)
LUO YUANDONG (CN)
BAI YUN (CN)
LI FENG (CN)
YIN QING (CN)
WU XIAOLIN (CN)
LI WENBIN (CN)
LUO YUANDONG (CN)
BAI YUN (CN)
LI FENG (CN)
YIN QING (CN)
WU XIAOLIN (CN)
LI WENBIN (CN)
Application Number:
PCT/CN2021/097026
Publication Date:
August 04, 2022
Filing Date:
May 29, 2021
Export Citation:
Assignee:
JIANGYIN XINGCHENG SPECIAL STEEL WORKS CO LTD (CN)
International Classes:
C22C38/02; C21C7/06; C21C7/10; C21D1/32; C21D6/00; C21D8/06; C21D9/00; C22C33/06; C22C38/04; C22C38/06; C22C38/42; C22C38/44; C22C38/50; C22C38/54; C22C38/60
Foreign References:
| CN109338035A | 2019-02-15 | |||
| CN111218611A | 2020-06-02 | |||
| CN105950974A | 2016-09-21 | |||
| CN109161658A | 2019-01-08 |
Attorney, Agent or Firm:
JIANGYIN QING ZHOU PATENT AGENCY (GENERAL PARTNERSHIP) (CN)
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