C - Chemistry – Metallurgy – 21 – D
Patent
C - Chemistry, Metallurgy
21
D
C21D 9/56 (2006.01) C21D 11/00 (2006.01)
Patent
CA 2650187
Method of reducing the formation of heat-induced folds on metal strips (1) exposed to rapid heating in continuous heat-treatment lines, in which lines said strips are caused to pass through heating sections (2) comprising successive and separate heating means (5; 5a; 5b; 5c; 5d), wherein the average slope of the increase in temperature of the strip between the inlet and the outlet of a heating means decreases from one heating means to the following heating means. In this way, the variation of the heating speed at all points on the strip is reduced as the temperature of the strip increases, such that the transversal compressive stresses do not exceed the critical level of fold formation.
Procédé de réduction de la formation de plis d'origine thermique sur des bandes métalliques (1) soumises à un chauffage rapide dans des lignes continues de traitement thermique dans lesquelles lesdites bandes sont amenées à traverser des sections de chauffage (2) comportant des moyens de chauffage (5; 5a; 5b; 5c; 5d) successifs et distincts, selon lequel la pente moyenne de l'augmentation de température de la bande entre l'entrée et la sortie d'un moyen de chauffage diminue d'un moyen de chauffage au moyen de chauffage suivant. Ainsi la variation de la vitesse de chauffage en tous points de la bande se réduit au fur et à mesure que la température de la bande augmente, de façon à ce que les contraintes transversales de compression ne dépassent pas le niveau critique de formation de plis.
Marmonier Frederic
Pasquinet Catherine
Fives Stein
Robic
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