Producing rolled steel products
AssigneeCentre de Recherches Metallurgiques-Centrum voor Research in de Metallurgie
InventorsMario Economopoulos, Yves Jean Respen
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Abstract
In the rolling mill the temperature of the product is reduced to between Ac.sub.3 and Ac.sub.3 + 150.degree. C before it enters the finishing stands. The product emerging from the finishing stands is quenched to provide a surface layer of martensite and/or bainite. Subsequently the heat of the core of the product is allowed to raise the temperature of the surface layer to between 450.degree. and 750.degree. C, so that the quenched layer is tempered.
Claims10
A method of producing a rolled steel product in a rolling mill including finishing stands, the method comprising the steps of reducing the temperature of the product, before it enters the finishing stands, to a value between Ac.sub.3 and Ac.sub.3 + 150.degree. C;
- quenching the product emerging from the finishing stands, thereby forming a quenched surface comprising martensite and/or bainite, the product still having an unquenched core;
- and allowing heat from the core to raise the temperature of the quenched surface to a value between 450.degree. and 750.degree. C, whereby the quenched surface is tempered.
Dependencies are inferred from the claim text.