Title:
低熱膨張鋳鋼品及びその製造方法
Document Type and Number:
Japanese Patent JP6656013
Kind Code:
B2
Abstract:
PROBLEM TO BE SOLVED: To provide a cast steel article small in absolute value of thermal expansion coefficient in all sites.SOLUTION: There is provided a low thermal expansion cast steel article having a predetermined component composition, austenite with average crystal particle diameter of 200 μm or less as a main phase, containing a martensite structure of 0 to 3% by area percentage and having thermal expansion coefficient at 18 to 28°C of ±0.2×10/°C. There is provided a manufacturing method of the low thermal expansion cast steel article by holding a cast steel article having thermal expansion coefficient at 18 to 28°C of -0.2×10/°C or less at 300 to 450°C for 0.5 to 24 hours and then at -30 to 0°C for 0.5 to 24h.SELECTED DRAWING: Figure 1
Inventors:
Haruyasu Ohno
Kotaro Ona
Kotaro Ona
Application Number:
JP2016028006A
Publication Date:
March 04, 2020
Filing Date:
February 17, 2016
Export Citation:
Assignee:
Shinpokoku Steel Co., Ltd.
International Classes:
C22C38/00; C21D6/00; C22C38/10
Domestic Patent References:
| JP4289149A |
Foreign References:
| KR1020160004194A |
Attorney, Agent or Firm:
Atsushi Aoki
Takashi Ishida
Tetsuji Koga
Hiroshi Kamematsu
Fukuchi Ritsuo
Manabu Saito
Nakamura Asayuki
Takashi Ishida
Tetsuji Koga
Hiroshi Kamematsu
Fukuchi Ritsuo
Manabu Saito
Nakamura Asayuki