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Title:
FABRICATION METHOD FOR STEPPED FORGED MATERIAL
Document Type and Number:
WIPO Patent Application WO/2012/147742
Kind Code:
A1
Abstract:
Provided is a method for fabricating a stepped forged material that can realize a uniform microscopic structure in both the large diameter flange portion and the small diameter shaft portion. This method for fabricating a stepped forged material comprises the following steps: a step for obtaining a primary forged material in which an austenite stainless steel rod-shaped material is heated to 1000-1080°C, and, without any further heating, the material is forged by means of reciprocal forging into a round rod having along the entire length thereof a forging ratio of 1.5 or greater; a step for obtaining a secondary forged material, that forms the large diameter flange portion and the small diameter shaft portion, in which without reheating, the small diameter shaft portion is formed by means of reciprocal forging at a temperature where the surface temperature of the primary forged material never falls more than 200°C lower than the abovementioned material heating temperature and the forging is completed before the surface temperature of the final forged portion falls more than 300°C lower than the abovementioned heating temperature; and a step for performing a solution heat treatment in which the secondary forged material is heated to 1040-1100°C for 30 minutes or longer.

Inventors:
NAGAO Shinya (HITACHI METALSLTD.,2107-2,Yasugi-cho,Yasugi-sh, Shimane 01, 〒6928601, JP)
長尾 慎也 (〒01 島根県安来市安来町2107番地2 日立金属株式会社 安来工場内 Shimane, 〒6928601, JP)
Application Number:
JP2012/060974
Publication Date:
November 01, 2012
Filing Date:
April 24, 2012
Export Citation:
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Assignee:
HITACHI METALS,LTD. (2-1Shibaura 1-chome, Minato-ku Tokyo, 14, 〒1058614, JP)
日立金属株式会社 (〒14 東京都港区芝浦一丁目2番1号 Tokyo, 〒1058614, JP)
NAGAO Shinya (HITACHI METALSLTD.,2107-2,Yasugi-cho,Yasugi-sh, Shimane 01, 〒6928601, JP)
International Classes:
B21K1/12; B21J5/06; B21J7/16; C21D8/00
Foreign References:
JPH04190941A1992-07-09
JPH04276042A1992-10-01
JPH0693389A1994-04-05
JP2003251429A2003-09-09
JPH04190941A1992-07-09
JP2003334633A2003-11-25
Other References:
See also references of EP 2703100A4
Download PDF:
Claims: