Method for continuous recrystallization annealing of a steel strip
AssigneeAvesta Sheffield
InventorSten Ljungars
Life of this patent
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Abstract
Method for the continuous manufacture of steel strip in which steel strip is fed into an annealing furnace at a certain feed-in rate and drawn out of the furnace at a rate higher than the feed-in rate while subjecting the steel strip to a pulling force in the annealing furnace at a temperature above the recrystallization temperature of the steel in the region of 1000.degree. to 1250.degree. C. This results in the introduction of a permanent stretch of the steel strip corresponding to the difference between the feed-out and feed-in rates as well as a reduction in the cross-section of the strip corresponding to the elongation and a reduction of the strip thickness and strip width.
Claims6
Method for the continuous manufacture of steel strip, comprising:
- (a) subjecting steel strip to at least one cold rolling step to produce cold rolled steel strip and cause a first strip thickness reduction;
- (b) feeding said cold rolled steel strip into an annealing furnace at a certain feed-in rate and drawing out of the furnace at a feed-out rate which is higher than said feed-in rate;
- (c) subjecting said cold rolled steel strip to a pulling tension in said annealing furnace at a temperature between 1000.degree. and 1250.degree. C. to give a permanent elongation of at least 8% to said steel strip corresponding to the difference between said feed-out and feed-in rates, and also to give a reduction in cross-section of the strip corresponding to said elongation, including a reduction in strip width and a second strip thickness reduction.
Dependencies are inferred from the claim text.