C - Chemistry – Metallurgy – 21 – D
Patent
C - Chemistry, Metallurgy
21
D
148/34
C21D 8/00 (2006.01) C21D 1/84 (2006.01) C21D 6/00 (2006.01) C21D 8/02 (2006.01) C21D 9/00 (2006.01) C21D 9/68 (2006.01)
Patent
CA 1316438
ABSTRACT OF THE DISCLOSURE C21D A method of heat treating a body of corrosion resistant steel which is, preferably, in coil form, having an austenitic to ferrite and carbide transformation temperature lying between 650°C and 850°C and a composition which results in a steel preferably having mechanical properties typically as follows: Proof stress 350MPa, ultimate tensile stress 520MPa, elongation 25% and Brinell hardness 165 and from which Martensite microstructures are generally absent at cooling rates lower than 5° C/min and where the method comprises : hot working the steel body at above the transformation temperature; cooling the hot worked steel body to below the transformation temperature at a cooling rate of between 10°C/min and 1°C/min determined to ensure generally the absence of Martensite microstructures throughout the body.
599727
Gowling Lafleur Henderson Llp
Middelburg Steel And Alloys (proprietary) Limited
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