EP 4186990 A4 20240605 - STEEL FOR BALL-CAGE TYPE UNIVERSAL JOINT RETAINER AND PRODUCTION METHOD THEREFOR
Title (en)
STEEL FOR BALL-CAGE TYPE UNIVERSAL JOINT RETAINER AND PRODUCTION METHOD THEREFOR
Title (de)
STAHL FÜR EINE KUGELKÄFIG-UNIVERSALGELENKHALTERUNG UND HERSTELLUNGSVERFAHREN DAFÜR
Title (fr)
ACIER POUR DISPOSITIF DE RETENUE DE JOINT UNIVERSEL DE TYPE CAGE À BILLES ET SON PROCÉDÉ DE PRODUCTION
Publication
Application
Priority
- CN 2021116576 W 20210905
- CN 202110117968 A 20210128
Abstract (en)
[origin: EP4186990A1] The present invention belongs to the technical field of special steel smelting, and relates to a steel for a cage of a ball-cage universal joint and a production method therefor. The steel comprises the following chemical ingredients by wt%: 0.10-0.25% of C, 0.20-0.40% of Si, 0.40-0.65% of Mn, 0.40-0.70% of Cr, 0.0003-0.0025% of B, 0.010-0.035% of Ti, 0.30-0.45% of Mo, 0.0050-0.0100% of N, ≤0.015% of S, ≤0.025% of P, ≤0.25% of Ni, ≤0.30% of Cu, 0.015-0.035% of Al, ≤0.0010% of O, ≤ 0.04% of As, ≤ 0.03% of Sn, ≤0.005% of Sb, ≤0.002% of Pb, and the balance being Fe and unavoidable impurities. The microstructure of the steel is bainite, and the grain size of austenite G≥6. The production process comprises primary smelting of molten steel, refining of molten steel, vacuum degassing of molten steel, continuous casting, hot rolling and finishing. In the present application, the chemical ingredients are optimized, and the alloy costs are reduced. Furthermore, a hardenability similar to that of 20CrMnTi is achieved, the strength and toughness of the steel, manufactured by using the chemical ingredients combined with the production method, are better than the strength and toughness of 20CrMnTi, and the comprehensive performance meets the requirements of the steel for the cage of the ball-cage type universal joint.
IPC 8 full level
C22C 38/02 (2006.01); C21C 7/00 (2006.01); C21C 7/06 (2006.01); C21C 7/10 (2006.01); C21D 8/00 (2006.01); C22C 38/04 (2006.01); C22C 38/06 (2006.01); C22C 38/20 (2006.01); C22C 38/22 (2006.01); C22C 38/32 (2006.01); C22C 38/42 (2006.01); C22C 38/44 (2006.01); C22C 38/54 (2006.01)
CPC (source: CN EP)
C21C 7/0056 (2013.01 - CN EP); C21C 7/06 (2013.01 - CN EP); C21C 7/10 (2013.01 - CN EP); C21D 1/02 (2013.01 - EP); C21D 1/18 (2013.01 - EP); C21D 8/005 (2013.01 - CN); C21D 8/065 (2013.01 - EP); C21D 9/0075 (2013.01 - EP); C22C 38/02 (2013.01 - CN EP); C22C 38/04 (2013.01 - CN EP); C22C 38/06 (2013.01 - CN EP); C22C 38/20 (2013.01 - CN EP); C22C 38/22 (2013.01 - CN EP); C22C 38/32 (2013.01 - CN EP); C22C 38/42 (2013.01 - CN EP); C22C 38/44 (2013.01 - CN EP); C22C 38/54 (2013.01 - CN EP); C21D 9/0068 (2013.01 - EP); C21D 2211/002 (2013.01 - CN EP); C21D 2211/004 (2013.01 - EP)
Citation (search report)
- [XY] EP 2135962 A1 20091223 - SUMITOMO METAL IND [JP]
- [YA] CN 109182901 A 20190111 - JIANGYIN XINGCHENG SPECIAL STEEL WORKS CO LTD
- [A] US 2019382864 A1 20191219 - CHO YEOL-RAE [KR], et al
- [A] CN 107058882 A 20170818 - SHANDONG IRON & STEEL CO LTD
- [A] EP 3078758 A1 20161012 - KOBE STEEL LTD [JP]
- See also references of WO 2022160720A1
Designated contracting state (EPC)
AL AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MK MT NL NO PL PT RO RS SE SI SK SM TR
DOCDB simple family (publication)
EP 4186990 A1 20230531; EP 4186990 A4 20240605; CN 112981237 A 20210618; CN 112981237 B 20221011; JP 2024502743 A 20240123; WO 2022160720 A1 20220804; WO 2022161180 A1 20220804
DOCDB simple family (application)
EP 21922314 A 20210905; CN 202110117968 A 20210128; CN 2021116576 W 20210905; CN 2022071755 W 20220113; JP 2023537250 A 20210905