Title:
HIGH STRENGTH WIRE ROD EXCELLENT IN DELAYED FRACTURE RESISTANCE AND FORGEABILITY AND/OR UNDER HEAD TOUGHNESS AND ITS PRODUCING METHOD
Document Type and Number:
Japanese Patent JP3816721
Kind Code:
B2
Abstract:
PROBLEM TO BE SOLVED: To provide a high strength wire rod excellent in forgeability, under head toughness as a bolt, and a delayed fracture resistance, and having tensile strength of ≥1,200 N/mm2, and to provide a useful method for producing the same high strength wire rod.
SOLUTION: This wire rod is composed of steel containing 0.50 to 1.0% C, and in which the content of Si is suppressed to <0.1% as well, and, by suppressing the formation of one or more kinds of structures among pro- eutectoid ferrite, pro-eutectoid cementite, bainite and martensite, the area ratio of a pearlitic structure is controlled to ≥80%, and also, by forced wire drawing, strength of ≥1,200 N/mm2 and excellent delayed fracture resistance are imparted thereto.
Inventors:
Yuichi Namimura
Nobuhiko Ibaraki
Nobuhiko Ibaraki
Application Number:
JP2000107022A
Publication Date:
August 30, 2006
Filing Date:
April 07, 2000
Export Citation:
Assignee:
KABUSHIKI KAISHA KOBE SEIKO SHO
International Classes:
C21D8/06; C22C38/00; C21D9/52; C22C38/02; C22C38/04; C22C38/30; (IPC1-7): C22C38/00; C21D8/06; C21D9/52; C22C38/02; C22C38/30
Domestic Patent References:
| JP11315348A | ||||
| JP63206449A | ||||
| JP5177245A | ||||
| JP7090484A | ||||
| JP11269607A | ||||
| JP11315349A | ||||
| JP9263911A | ||||
| JP9209085A | ||||
| JP9078182A |
Attorney, Agent or Firm:
Kyuichi Ueki
Etsushi Kotani
Etsushi Kotani
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