C - Chemistry – Metallurgy – 21 – D
Patent
C - Chemistry, Metallurgy
21
D
148/31
C21D 8/00 (2006.01)
Patent
CA 1170151
ABSTRACT OF THE DISCLOSURE A high-strength, high-toughness steel with good work- ability is produced by working a steel containing 0.005-0.3% C and 0.3-2.5% Mn and optionally up to 1.5% Si, in the course of hot working thereof, at temperatures within the range of from the Ar3 point to 930°C or to 980°C (for a steel containing Nb, V, Ti and/or Zr) at an area reduction rate of at least 30%, and, in the course of cooling, rapidly cooling the steel in the ferrite phase precipitation temperature range when the ferrite phase has occu- pied 5-65% or 5.60% (for a steel with Si and/or Nb, V, Ti and/or Zr) of the steel, whereby a two-phase structure comprising ferrite and martensite is produced.
373816
Ogawa Rikuo
Yutori Toshiaki
Kobe Steel Ltd.
Riches Mckenzie & Herbert Llp
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