| 摘要 |
The Hot Lamination Process for manufacturing Flat Products consists in plastically deforming a material by subjecting the same to a stress higher than the Strength Resistance and lower than the Maximum Resistance Threshold thereof, thereby causing the material to have a higher length and a reduced thickness, presenting a negligible width variation. The present conventional lamination process is generally performed at a temperature slightly higher to that used for the material recristalization, which is of from about 800 degree C to about 1300 degree C, depending on the processed alloy. The conventional process for performing the Hot Controlled Lamination establishes that the final lamination should be started with a high bar thickness (or intermediate roughing), generally higher than 40 mm, so as to increase the total reduction under the no recristalization temperature of the austenite for obtaining a fine ferritic grain following the austenite/ferrite transformation. The process of the present invention allows austenitic grains to be conditioned in conventional laminators having a bar thickness lower than 40 mm, and a refined ferritic grain to be obtained followed the forced cooling of the band. The inventive process is characterised in that it includes the following advantages: refining ferritic grains by previously conditioning the austenite; an improved control of the no-recristalization temperature of the austenite, and the possibility of performing an additional refining process of the austenitic grain by dynamic recristalization.
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