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Abstract

Process for the production of a hot rolled metal strip of very high strength, usable for shaping and particularly for stamping, characterized in that a steel of the following weight composition: carbon, 0.12-0.25%; manganese, 1-2%; aluminum, 0.03-2.5%; silicon, 0.03-2%; chromium, 0.04-2%; phosphorus, 0.02-0.09%; sulfur optionally up to 0.01%; titanium up to 0.15%; niobium up to 0.15%; vanadium up to 0.15%; is subjected to: rolling at a temperature below 880.degree. C.; a first short cooling, carried out over a time less than 10 seconds, a second controlled cooling with a cooling speed V ref1 comprised between 20.degree. C./sec. and 150.degree. C./sec., the temperature at the end of the second cooling being comprised between 700.degree. C. and 750.degree. C., holding at a temperature level, a third cooling, also controlled, whose speed is comprised between 20.degree. C./sec. and 150.degree. C./sec., the temperature at the end of the third cooling being comprised between 350.degree. C. and 550.degree. C.

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