Title:
PRODUCTION OF PC STEEL ROD EXCELLENT IN UNIFORM ELONGATION AND HIGH TEMPERATURE RELAXATION CHARACTERISTIC
Document Type and Number:
Japanese Patent JPH09241745
Kind Code:
A
Abstract:
To provide a producing method capable of producing a PC steel rod excellent in uniform elongation of ≥1420N/mm2 tensile strength and high temp. relaxation characteristics without applying a strain applying stage and stages such as reheating treatment.
A steel contg., by weight, 0.05 to 0.35% C and 0.2 to 3.0% Mn and furthermore contg. Si and Al so as to satisfy 2.0≤Si+AL≤5.0% is subjected to hot rolling and is thereafter subjected to direct quenching at a cooling rate of 5 to 50°C/s to form its structure into the one consisting essentially of martensite, by which the PC steel rod excellent in uniform elongation of ≥1420N/mm2 tensile strength and high temp. relaxation characteristics can be produced.
Inventors:
YOKOTA TOMOYUKI
SHIRAGAMI TETSUO
MIZOGUCHI SHIGERU
YAMASHITA EIJI
NITTA HAJIME
SHIRAGAMI TETSUO
MIZOGUCHI SHIGERU
YAMASHITA EIJI
NITTA HAJIME
Application Number:
JP4482796A
Publication Date:
September 16, 1997
Filing Date:
March 01, 1996
Export Citation:
Assignee:
NIPPON KOKAN KK
HIGH FREQUENCY HEATTREAT
HIGH FREQUENCY HEATTREAT
International Classes:
C21D8/08; C22C38/00; C22C38/06; C22C38/58; (IPC1-7): C21D8/08; C22C38/00; C22C38/06; C22C38/58
Attorney, Agent or Firm:
Takehiko Suzue