Title:
HIGH MANGANESE INGOT, ITS CONTINUOUS CASTING AND MANUFACTURE OF HIGH TENSILE STEEL
Document Type and Number:
Japanese Patent JP3387378
Kind Code:
B2
Abstract:
PROBLEM TO BE SOLVED: To obtain a material, which has a slight Mn segregation in the center part and which excels in the low temperature toughness and weldability, by specifying the chemical component of a high Mn steel ingot and fixing the Ms value for which the degree of Mn segregation and its facility are indexed.
SOLUTION: The steel composition in weight % is 0.02-0.1 C, 0.03-0.6 Si, 0.8-2.5 Mn, 0.015 or less P, 0.003 or less S, 0.3-1.2 Ni, 0.01-0.1 Nb, 0.005-0.03 Ti, 0.004-0.1 Al, 0.001-0.006 N, 0-0.6 Cu, 0-0.8 Cr, 0-0.6 Mo, 0-0.1 V, 0-0.0025 B, 0-0.006 Ca, and the balance Fe and inevitable impurities. In addition, (Mn content in the center of the ingot)/(average Mn content of the ingot) is made not more than 3. Further, the value of Vs in an expression is made 0.28≤Vs≤0.42. This high Mn ingot is obtained in the manner that bulging is caused on the pulled out ingot and that screw-down equivalent to the bulging quantity is imparted before completing solidification, for example.
Inventors:
Tomoya Fujiwara
Hideharu Okaguchi
Yoshinori Yazawa
Masahiko Hamada
Yuichi Komizo
Hideharu Okaguchi
Yoshinori Yazawa
Masahiko Hamada
Yuichi Komizo
Application Number:
JP23163997A
Publication Date:
March 17, 2003
Filing Date:
August 28, 1997
Export Citation:
Assignee:
SUMITOMO METAL INDUSTRIES,LTD.
International Classes:
B22D11/00; B22D11/10; B22D11/115; B22D11/128; C21D8/02; C22C38/00; C22C38/58; (IPC1-7): C22C38/00; B22D11/00; B22D11/115; B22D11/128; C21D8/02; C22C38/58
Attorney, Agent or Firm:
Morio Mori (1 outside)
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