US 2014/0096578 A1 · METHOD AND APPARATUS FOR PREPARING STEEL STOCK BEFORE HOT ROLLING

Abstract

A process and an apparatus for preparing steel stock before hot rolling. The steps of preheating the stock (5, 16, 22) in a first induction furnace (6) so that the preheated stock enters a subsequent descaling apparatus (7) with a surface temperature of T1≧1000° C.; descaling the preheated stock by a plurality of water jets in a descaling apparatus (7); direct subsequent heating of the descaled stock in a second induction furnace (8), where the descaled stock enters the second induction furnace (8) at a temperature T2 which is ≧Tcurie of the stock and heating in the second induction furnace 8 is either in a largely inert or largely reducing protective gas atmosphere; passing the heated stock in a rolling mill (9), where the heated stock enters the rolling mill (9) at a temperature 1220° C.≧T3 1050° C.

Claims19

Dependent claims

A method for preparing steel rolling stock before hot rolling of the stock, comprising the steps of:

preheating the rolling stock in a first induction furnace having an air atmosphere, the preheating being such that the preheated rolling stock enters a descaling device downstream of the first induction furnace at a surface temperature of the stock T1≧1000° C.;
immediately subsequently descaling the preheated rolling stock by a plurality of water jets in the descaling device jetting water on the rolling stock;
causing the descaled rolling stock to enter a second induction furnace at a rolling stock temperature T2≧TCurie, heating the descaled rolling stock in the second induction furnace in either a largely inert or a largely reducing protective gas atmosphere;
and
hot rolling the heated rolling stock in a rolling mill with at least three rolling passes, wherein the heated rolling stock enters the rolling mill at a temperature 1220° C.≧T3≧1050° C.

2 more elements

An apparatus for preparing steel rolling stock before hot rolling, comprising:

a first induction furnace configured for preheating the rolling stock to a temperature T1≧1000° C., the first induction furnace having an air atmosphere;
a descaling device following the first furnace and configured for receiving the preheated rolling stock and for descaling the preheated rolling stock, the descaling device comprising a plurality of water jets in the descaling device;
a second induction furnace following the descaling device and configured for receiving the descaled rolling stock, and for heating the descaled rolling stock to a temperature 1220° C.≧T3≧1050° C. the second furnace having a largely inert or largely reducing protective gas atmosphere in the second furnace;
and
a rolling mill following the second furnace and configured for receiving the roiling stock from the second furnace, the rolling mill having at least three stands for hot rolling the heated rolling stock.

2 more elements

Dependencies are inferred from the claim text.

Method and apparatus for preparing steel stock before hot rolling

Life of this patent

Method and apparatus for preparing steel stock before hot rolling

Life of this patent

Abstract

Claims19