C - Chemistry – Metallurgy – 21 – D
Patent
C - Chemistry, Metallurgy
21
D
C21D 8/02 (2006.01) C21D 1/02 (2006.01) C21D 1/19 (2006.01)
Patent
CA 2200258
A method of cooling steel sections which are hot from rolling by means of shock-like cooling following the rolling process so as to form a martensitic surface layer, and by subsequently autogenously tempering this surface layer by means of core heat to obtain a tough-resistant structure with an austenitic remaining cross-section, wherein the method is used in connection with types of steel which, with uncontrolled cooling in air, would directly transform from the austenitic phase into martensite because of their alloying elements from the group Cr, Mn, Mo, Ni and other suitable elements.
Méthode de refroidissement par choc thermique de profilés en acier qui sont chauds après laminage de manière à former une couche martensitique superficielle qui est subséquemment soumise à un revenu autogène par chauffage de la masse en vue d'obtenir une structure à forte résistante avec une section restante austénitique, la méthode étant utilisée en rapport avec des types d'acier qui, en cas de refroidissement non contrôlé à l'air, se transformeraient directement de la phase austénitique en martensite en raison de leurs éléments d'alliage du groupe Cr, Mn, Mo Ni et d'autres éléments qui s'y prêtent.
Kohlmann Rainer
Meyer Meinert
Riches Mckenzie & Herbert Llp
Sms Schloemann-Siemag Aktiengesellschaft
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