Title:
HIGH STRENGTH PC STEEL BAR AND ITS PRODUCTION
Document Type and Number:
Japanese Patent JP3348188
Kind Code:
B2
Abstract:
PURPOSE: To produce a high strength PC steel bar excellent in delayed fracture properties and good in spot weldability and to provide a method for producing the same.
CONSTITUTION: A high strength PC steel bar having a compsn. contg. 0.1 to 0.4% C, 0.05 to 2.0% Si, 0.2 to 2.0% Mn, 0.005 to 0.1% Al, ≤0.015% P an ≤0.015% S, furthermore contg., at need, one or ≥ two kinds among Ti, B, Cr, Mo, Ni, Cu, V and Nb, in which PCM is limited to the range of 0.15 to 0.45%, and the balance Fe with inevitable impurities, moreover having a bainitic structure, furthermore, in which a <110> texture is contaied in a range over at least 5% of the radius in the axial center direction from the surface layer and having ≥1450MPa strength is produced; where PCM(%)=C+Si/30+(Mn+Cr+Cu)/20+Ni/60+Mo/15+V/10+5B.
Inventors:
Toshizo Tarui
Michiaki Tateyama
Michiaki Tateyama
Application Number:
JP5955394A
Publication Date:
November 20, 2002
Filing Date:
March 29, 1994
Export Citation:
Assignee:
Nippon Steel Corporation
International Classes:
E02D5/58; B21C1/00; C21D8/08; C21D9/52; C22C38/00; C22C38/06; (IPC1-7): C22C38/00; B21C1/00; C21D8/08; C21D9/52; C22C38/06; E02D5/58
Domestic Patent References:
| JP7224355A | ||||
| JP7258797A | ||||
| JP6306543A | ||||
| JP5351121A | ||||
| JP60245722A |
Attorney, Agent or Firm:
Tachio Chanogi (1 outside)
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