Title:
A manufacturing method of a high nitrogen stainless steel pipe for high-pressure-water-proof matter gas storage container manufacture which has corrosion resistance and heat resistance excellent in high intensity and the Takanobu nature
Document Type and Number:
Japanese Patent JP6039774
Kind Code:
B2
Abstract:
A process for manufacturing a high nitrogen stainless steel pipe material includes keeping an outside surface and/or an inside surface of an austenite stainless steel pipe material in contact with a substance that becomes a nitrogen (N) source, heating the steel pipe together with the nitrogen source substance at a temperature of 800° C. to 1100° C. in a range of temperatures not higher than the critical temperature for crystal grain enlargement of the steel pipe material to cause nitrogen to be absorbed into the surface of the pipe and diffused into the steel solid phase, and applying to the heat-treated pipe material annealing treatment in the range of temperatures in vacuum, inert gas including argon gas or an atmosphere of a gas with a reducing substance including H2 gas added thereto, to result in a decrease of nitrogen concentration gradient.
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Inventors:
Miura Harumatsu
Kazumasa Oda
Kazumasa Oda
Application Number:
JP2015189432A
Publication Date:
December 07, 2016
Filing Date:
September 28, 2015
Export Citation:
Assignee:
Miura Harumatsu
Oda Sangyo Co., Ltd.
Oda Sangyo Co., Ltd.
International Classes:
C23C8/80; B21C37/06; B23K20/00; C21D1/06; C21D9/08; C22C38/00; C22C38/50; C23C8/26; C23C8/62
Domestic Patent References:
| JP1287249A | ||||
| JP55058354A | ||||
| JP56081658A | ||||
| JP58133352A | ||||
| JP2007321198A | ||||
| JP2000169952A | ||||
| JP8311618A | ||||
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| JP2125858A | ||||
| JP2007270350A | ||||
| JP2007126688A |
Foreign References:
| US20030231976 | ||||
| US20050178477 | ||||
| US20090159602 |
Attorney, Agent or Firm:
Yukio Murata