CAST STEEL FOR WELDING HAVING EXCELLENT TOUGHNESS - KABUSHIKI KAISHA KOBE SEIKO SHO

Title:

CAST STEEL FOR WELDING HAVING EXCELLENT TOUGHNESS

Document Type and Number:

Japanese Patent JP3842720

Kind Code:

B2

Abstract:

PROBLEM TO BE SOLVED: To provide a cast steel for welding capable of stably achieving high toughness even if a cooling speed fluctuates and also capable of exhibiting good toughness while maintaining good productivity in a chemical component meeting the JIS standard.
SOLUTION: The steel is composed of a mixed structure containing pearlite and/or bainite other than ferrite, wherein a ferrite fraction is 40-85 area %, a pearlite fraction is ≤30 area % and a bainite fraction is ≤30 area %, and also fine coherent precipitates existing in the ferrite and having a diameter of ≤30 μm are averagely ≤50 per 1 μm2 on a surface area to be inspected.

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Inventors:

Toshio Murakami
Shigenobu Namba
Kagawa Kyounori
Fujitsuna Nobuyuki

Application Number:

JP2002328685A

Publication Date:

November 08, 2006

Filing Date:

November 12, 2002

Export Citation:

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Assignee:

KABUSHIKI KAISHA KOBE SEIKO SHO

International Classes:

C22C38/00; C22C38/06; C22C38/46; (IPC1-7): C22C38/00; C22C38/46

Domestic Patent References:

JP2000345285A
JP2000119795A
JP8035038A
JP7076755A
JP51039521A
JP52021210A

Attorney, Agent or Firm:

Kyuichi Ueki
Etsushi Kotani

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