C - Chemistry – Metallurgy – 21 – D
Patent
C - Chemistry, Metallurgy
21
D
80/25
C21D 8/02 (2006.01) B21B 1/46 (2006.01) C21D 1/64 (2006.01) C21D 8/04 (2006.01) B21B 13/20 (2006.01)
Patent
CA 1322479
ABSTRACT Manufacture of formable steel strip having a thickness between 0.5 and 1.5 mm, by forming liquid steel in a continuous casting machine into a hot slab having a thickness of less than 100 mm, and hot rolling the hot slab in the austenitic region and below 1100°C, to form strip having a thickness of between 2 and 5 mm. The strip is cooled to a temperature between 300°C and the temperature Tt at which 75% of the steel is converted to ferrite, and the cooled strip rolled at the above-mentioned temperature between 300°C and Tt with a thickness reduction of at least 25% and at a rolling speed not more than 1000 m/min. The rolled strip is then coiled. This process produces a formable thin sheet strip with good mechanical and surface properties and does not require cold rolling. The properties of the strip can be varied by varying the ferritic rolling temperature.
575966
Den Hartog Huibert Willem
Van Perlstein Erik Bernard
Hoogovens Groep Bv
Ridout & Maybee Llp
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