Title:
PROCESS FOR FORMING, BY MEANS OF WARM RING ROLLING, HIGH-CARBON CHROMIUM BEARING STEEL CAPABLE OF STRUCTURE SPHEROIDIZATION
Document Type and Number:
WIPO Patent Application WO/2019/001262
Kind Code:
A1
Abstract:
Disclosed is a process for forming, by means of warm ring rolling, a high-carbon chromium bearing steel capable of structure spheroidization, the process comprising the following steps: S1. a ring blank is heated, in a heating furnace, to 10ºC-40ºC above the critical temperature Ac1 of the material, and holding the temperature for a period of time; S2. the heated ring blank is slowly cooled along with the furnace to 0ºC-50ºC below the critical temperature Ar1 of the material; S3. the rolling reduction is rationally designed and the rolling feed speed is selected such that the ring blank is roll-formed within a certain deformation amount and deformation temperature range. The method directly achieves structure spheroidization by means of warm ring rolling, can omit traditional spheroidization annealing, and obtains a more finely spheroidized structure, significantly reduces energy and time consumption, improves structure quality and reduces production costs.
Inventors:
QIAN DONGSHENG (CN)
YANG JUN (CN)
HUA LIN (CN)
LIU QINGLONG (CN)
WANG FENG (CN)
YANG JUN (CN)
HUA LIN (CN)
LIU QINGLONG (CN)
WANG FENG (CN)
Application Number:
PCT/CN2018/090766
Publication Date:
January 03, 2019
Filing Date:
June 12, 2018
Export Citation:
Assignee:
UNIV WUHAN TECH (CN)
International Classes:
B21H1/12; C21D8/00
Foreign References:
| CN107138660A | 2017-09-08 | |||
| CN102086493A | 2011-06-08 | |||
| JP5018305B2 | 2012-09-05 | |||
| CN104174660A | 2014-12-03 | |||
| CN1088265A | 1994-06-22 | |||
| CN100999775A | 2007-07-18 | |||
| CN104745789A | 2015-07-01 | |||
| CN106191396A | 2016-12-07 |
Attorney, Agent or Firm:
HUBEI WUHAN YONGJIA PATENT AGENCY CO., LTD (CN)
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