高張力鋼及びその製造方法 - Exxon Production Research Company

Title:

高張力鋼及びその製造方法

Document Type and Number:

Japanese Patent JP3545770

Kind Code:

B2

Abstract:

A high-tensile-strength steel having excellent toughness throughout its thickness, excellent properties at welded joints, and a tensile strength (TS) of at least about 900 MPa (130 ksi), and a method for making such steel, are provided. Steels according to this invention preferably have the following composition based on % by weight: carbon (C): 0.02% to 0.1%; silicon (Si): not greater than 0.6%; manganese (Mn): 0.2% to 2.5%; nickel (Ni): 0.2% to 1.2%; niobium (Nb): 0.01% to 0.1%; titanium (Ti): 0.005% to 0.03%; aluminum (Al): not greater than 0.1%; nitrogen (N): 0.001% to 0.006%; copper (Cu): 0% to 0.6%; chromium (Cr): 0% to 0.8%; molybdenum (Mo): 0% to 0.6%; vanadium (V): 0% to 0.1%; boron (B): 0% to 0.0025%; and calcium (Ca): 0% to 0.006%. The value of Vs as defined by Vs=C+(Mn/5)+5P-(Ni/10)-(Mo/15)+(Cu/10) is 0.15 to 0.42. P and S among impurities are contained in an amount of not greater than 0.015% and not greater than 0.003%, respectively. The carbide size in the steel is not greater than 5 microns in the longitudinal direction.

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Inventors:

Kuje Jung
Bangal Narasim Harao Puy
Raton Michael Jay
Petersen Clifford W
Tomoya Fujiwara
Hideharu Okaguchi
Masahiko Hamada
Yuichi Komizo

Application Number:

JP53770298A

Publication Date:

July 21, 2004

Filing Date:

February 26, 1998

Export Citation:

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Assignee:

Exxon Production Research Company
SUMITOMO METAL INDUSTRIES,LTD.

International Classes:

C21D8/02; C22C38/00; C22C38/02; C22C38/04; C22C38/08; C22C38/12; C22C38/14; C22C38/16; C22C38/18; C22C38/42; C22C38/44; C22C38/46; C22C38/48; C22C38/50; C22C38/58; (IPC1-7): C22C38/00; C21D8/02; C22C38/58

Domestic Patent References:

JP9041080A
JP9031536A
JP8209291A
JP8209290A

Attorney, Agent or Firm:

Minoru Nakamura
Fumiaki Otsuka
Sadao Kumakura
Shishido Kaichi
Hideto Takeuchi
Toshio Imajo
Nobuo Ogawa
Village shrine Atsuo
Takaki Nishijima
Atsushi Hakoda

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