US 4,829,656 AGranted

Process for making hot-rolled steel strip

AssigneeSMS Schloemann-Siemag Aktiengesellschaft

InventorWolfgang Rohde

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Abstract

To make hot rolled steel strap from strap like cast starting material cast pieces can be first cut from the solidfying casting after the casting process is completed. Then these cast pieces are guided to and stored in an oven where they are brought to and maintained at the rolling temperature. The cast pieces are fed in succession into the rolling mill. Then the cast pieces are stored there at the rolling temperature until the rolling process begins. A number of cast pieces are produced as raw products in our invention and stored until the rolling of these individual cast pieces starts. the casting is continuous and occurs also during the rolling operation. Because of the intermediate storage provided by the oven significant differences can exist between the casting time and the rolling time. Assembly and maintenance of the rolling mill, e.g. roll changing, can be performed in a pause of the roll cycle which includes the rolling time. If necessary the two pauses of two roll cycles are placed immediately in succession. The cast pieces formed during this time are fed to the oven and stored there. An apparatus for performing this process is also described.

Claims4

Dependent claims

A method of making hot-rolled steel strip, comprising the steps of:

(a) continuously casting an elongated steel casting;
(b) transversely separating from said casting a succession of long billets while continuing uninterrupted formation of the casting so that each billet is formed by the continuous casting in a predetermined casting time;
(c) feeding said long billets directly and exclusively into a storage furnace in succession in a longitudinal direction of said long billets;
(d) displacing the long billets fed to said furnace transversely therein and storing a plurality of said long billets in linearly outstretched form in said furnace in substantially mutually parallel relationship for a multiple of said casting time without additional energy supply to said furnace;
(e) withdrawing said long billets from said furnace in said longitudinal direction in succession and after storage in said furnace for said multiple of said casting time;
(f) directly rolling each of said long billets upon its withdrawal from said furnace in at least one rolling mill during a rolling time which is only a fraction of said casting time to produce hot-rolled strip, whereby the long billets withdrawn in succession from said furnace are rolled in succession;
and
(g) operating said rolling mill discontinuously for the rolling of said billets so that interruptions are provided in the operation of said rolling mill which are substantially equal to the difference between said rolling time and said casting time.

5 more elements

Dependencies are inferred from the claim text.

Facts

Application: 07/103,529Filed 30 Sep 1987
Priority: EP 86114160.413 Oct 1986
Granted: 16 May 1989
Term ends: Not estimatedThe source records don’t support an estimate.

Classification10 codes

C21D 9/0081
Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor: for slabs; for billets
B21B 1/466
For rolling metal immediately subsequent to continuous casting: in a non-continuous process, i.e. the cast being cut before rolling
B21B 1/26
In a continuous or semi-continuous process: by hot-rolling , e.g. Steckel hot mill
B21B 1/34
In reversing single stand mills, e.g. with intermediate storage reels for accumulating work: by hot-rolling