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US 6,852,180 B1Granted
Method for making carbon steel bands, in particular packaging steel bands, and resulting bands
AssigneeUsinor
InventorsMichel Faral, Michel Guttmann, Jean-Hubert Schmitt, Catherine Juckum, Helene Regle
Life of this patent
Estimating the term…
Abstract
The invention relates to the iron and steel industry. More specifically, the invention describes the manufacture of steel strip intended to be converted into thin packaging, such as for drinks and preserved food.
Claims29
A process for manufacturing a carbon steel strip suitable for use as packaging steel, in which:
- a steel having a composition suitable for use as packaging steel, wherein said steel contains alloying elements of Si, Cr, Ni, Mo, and Cu present in an amount less than 1%, is cast in the form of a thin strip from 0.7 to 10 mm in thickness, directly from liquid metal;
- an in-line hot rolling operation is carried out on said strip, wherein the strip after hot rolling has a thickness of less than 3 mm, and wherein at the end of which said steel is in the austenitic range;
- said strip undergoes forced cooling at a rate of 80 to 400° C./s, at both the beginning and the end of which said steel is in the ferritic range;
- said strip undergoes a cold rolling operation with a reduction ratio of at least 85%;
- and
- said strip undergoes an annealing operation.
3 more elements
A process for manufacturing a carbon steel strip suitable for use as a packaging steel, in which:
- a steel having a composition suitable for use as packaging steel, wherein said steel contains alloying elements of Si, Cr, Ni, Mo, and Cu present in an amount less than 1%, and wherein said steel is cast in the form of a thin strip from 0.7 to 10 mm in thickness, directly from liquid metal;
- an in-line hot rolling operation is carried out on said strip in two steps,
- wherein the first step is an in-line hot rolling step carried out in either an austenitic or ferritic range of the cast strip, with a reduction ratio of 20 to 70%, and then cooled down into the ferritic range, if not already in the ferritic range wherein after said first step, the strip is reheated so as to make said steel pass from the ferritic range into the austenitic range, and the second step is an in-line hot rolling step carried out with a reduction ratio of 10 to 30%, at the end of which second step said steel is in the austenitic range.
Dependencies are inferred from the claim text.