Title:
METHOD FOR PRODUCING AUSFERRITE STEEL AUSTEMPERED DURING CONTINUOUS COOLING FOLLOWED BY ANNEALING
Document Type and Number:
Japanese Patent JP2020045565
Kind Code:
A
Abstract:
To provide an improved method for cost-efficient production of an ausferrite steel.SOLUTION: Provided is a method for producing an austempered steel, characterized in that it comprises the steps of subjecting a steel alloy having a silicon content of 1.5-4.4 wt% and a carbon content of 0.3-0.8 wt% to continuous cooling followed by annealing, where the continuous cooling begins from a fully austenitic temperature that is achieved as a result of casting of one or more steel components, or hot forging or hot rolling of one or more semi-finished steel products. The cooling rate during the continuous cooling is initially sufficiently fast to prevent predominant formation of proeutectoid ferrite or pearlite, while subsequently at intermediate temperatures, the cooling rate is sufficiently slow to limit the amount of martensite being formed if cooled to ambient temperature or lower, and where the annealing is able to complete the transformation of carbon enriched austenite to ausferrite and to temper any martensite previously formed.SELECTED DRAWING: Figure 1
Inventors:
RICHARD LARKER
Application Number:
JP2019167378A
Publication Date:
March 26, 2020
Filing Date:
September 13, 2019
Export Citation:
Assignee:
AUSFERRITIC AB
International Classes:
C21D8/06; C22C38/00; C22C38/02; C22C38/58
Attorney, Agent or Firm:
Yasuhiko Murayama
Shinya Mitsuhiro
Tatsuhiko Abe
Shinya Mitsuhiro
Tatsuhiko Abe