Title:
【発明の名称】鋼組成物、および粒度調整されたミクロ組織を有する冷間成型および浸炭処理部品の製造方法
Document Type and Number:
Japanese Patent JP2001524168
Kind Code:
A
Abstract:
Steel compositions and processes are described that provide optimum resistance to austenite grain coarsening in cold-formed and carburized components for automotive and machine structural applications. The steel compositions include, in weight percent, 0.1-0.3% C 150-220 ppm N and a grain refining addition selected from the group consisting of Al, V plus Al and Nb plus Al, the balance comprising iron and other alloying elements typically found in carburizing grades of steel. The steels are processed by reheating to a temperature in the vicinity of solution temperature of the least soluble species of grain refining precipitate and then hot worked. The hot-worked steel is cooled at an accelerated rate to 500° C. and then subcritically annealed, cold formed in at least one operation with intermediate anneals subcritically annealed after the last cold-forming operation, and carburized quenched and tempered (6).
Inventors:
Leap, Michael, J.
Wingart, James, Sea.
Wingart, James, Sea.
Application Number:
JP54853098A
Publication Date:
November 27, 2001
Filing Date:
May 07, 1998
Export Citation:
Assignee:
The Timken Company
International Classes:
C23C8/22; C21D1/78; C21D8/00; C22C38/00; C22C38/06; C22C38/12; C22C38/44; C22C38/46; C22C38/48; C23C8/02; C21D8/02; C21D8/04; (IPC1-7): C22C38/00; C21D8/00; C22C38/12; C23C8/22
Attorney, Agent or Firm:
Shunichiro Suzuki (3 others)