# US 2010/0163205 A1 · Method for the production of a strip made of steel > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2010/0163205 A1 - Document ID: US20100163205A1 - Status: Published application - Kind: A1 - Application number: 12/733,041 - Filed: 2008-07-31 - Published: 2010-07-01 - Earliest claimed: 2007-08-04 - Assignees: SMS Seimag AG - Inventors: Jürgen Seidel; Ernst Windhaus; Markus Reifferscheid; Jürgen Müller - Web page: https://patentgrep.com/patent/US20100163205A1 ## CPC - B21B 1/463: {in a continuous process, i.e. the cast not being cut before rolling} - B21B 37/74: Temperature control, e.g. by cooling or heating the rolls or the product (B21B37/32, B21B37/44 take precedence) - C21D 8/0226: {Hot rolling} - C21D 11/005: {for cooling} - B21B 13/22: for rolling metal immediately subsequent to continuous casting, {i.e. in-line rolling of steel}(methods therefor B21B1/46; continuous casting B22D11/00, e.g. into moulds with rolls B22D11/06) - B21B 2261/20: Temperature - B21B 2275/06: Product speed - B21B: ROLLING OF METAL (auxiliary operations used in connection with metal-working operations covered in B21, see B21C; bending by rolling B21D; manufacture of particular objects, e.g. screws, wheels, rings, barrels, balls, by rolling B21H; pressure welding by means of a rolling mill B23K20/04) - C21D: MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING (surface treatment of metallic material involving at least one process provided for in class C23 and at least one process covered by this subclass C23F17/00; unidirectional solidification of eutectic materials or unidirectional demixing of eutectoid materials C30B) ## Abstract The invention relates to a method for fabricating a steel strip (1), in which firstly a slab (3) is cast in a caster (2), with the slab (3) exiting the caster (2) at a casting speed (v) with a given slab thickness (H), with the slab (3) then being rolled to form a strip (1) in at least one rolling train (4, 5) having a number of rolling stands (6, 7) and the strip (1) having a final thickness (dE) downstream of the last rolling stand (6, 7). In order to maintain optimum processing conditions and be able to react to unexpected events, the invention provides the following method steps: a) providing a functional relationship in a machine controller (8) between the casting speed (v) or the mass flow as a product of casting speed and slab thickness (v×H) or as a product of strip speed and strip thickness and the strip temperature (T) downstream of the last rolling stand (7), which rolls the strip (1), for a different number (n) of active rolling stands (7) and different final thicknesses; b) determining or specifying the casting speed (v) or the mass flow (v×H) and feeding the determined value into the machine controller (8); c) determining the optimum number of active rolling stands (7) and the final thicknesses and thickness reductions which can be rolled with them in the rolling train using the functional profiles stored in accordance with step a) in the machine controller (8) in order to achieve a desired strip temperature (T) downstream of the last active rolling stand (7) at the given casting speed (v) or at the given mass flow (v×H); d) raising a number of rolling stands (7) in the rolling train (5) so that only the number of rolling stands (7) determined in accordance with step c) are active. ## Claims ### Claim 1 Method for fabricating a steel strip (1), in which firstly a slab (3) is cast in a caster (2), with the slap (3) exiting the caster (2) at a casting speed (v) with a given slab thickness (H), with the slab (3) then being rolled to form a strip (1) in at least one rolling train (4, 5) having a number of rolling stands (6, 7) and the strip (1) having a final thickness (dE) downstream of the last rolling stand (6, 70), characterized in that the method has the following steps: a) providing a functional relationship in a machine controller (8) between the casting speed (v) or the mass flow as a product of casting speed and strip thickness and the strip temperature (T) downstream of the last rolling stand (7), which rolls the strip (1), for a different number (n) of active rolling stands (7) and different final thicknesses; b) determining or specifying the casting speed (v) or the mass flow (v×H) and feeding the determined value into the machine controller (8); c) determining the optimum number of active rolling stands (7) and the final thicknesses and thickness reductions which can be rolled with them in the rolling train using the functional profiles stored in accordance with step a) in the machine controller (8) in order to achieve a desired strip temperature (T) downstream of the last active rolling stand (7) at the given casting speed (v) or at the given mass flow (v×H); d) where necessary raising a number of rolling stands (7) in the rolling train (5) so that only the number of rolling stands (7) determined in accordance with step c) are active. ### Claim 2 (depends on 1) Method according to claim 1, characterized in that the functional relationship according to step a) of claim 1 is obtained by means of a computer model. ### Claim 3 (depends on 1) Method according to claim 1, characterized in that the strip (1) to be rolled is heated upstream of a finishing train (5) or a finishing train section, so that it has a defined intermediate temperature at the position Pref. ### Claim 4 (depends on 1) Method according to claim 1, characterized in that the strip (1) to be rolled is cooled on one or both sides at least between two rolling stands (7) of the finishing train (5). ### Claim 5 (depends on 4) Method according to claim 4, characterized in that the strip (1) is cooled between the last rolling stands (7) of the finishing train (5). ### Claim 6 (depends on 5) Method according to claim 5, characterized in that the strip (1) is cooled between the last two rolling stands (7) of the finishing train (5). ### Claim 7 (depends on 1) Method according to claim 1, characterized in that the temperature of the strip (1) is measured downstream of the last active rolling stand (7), and the measured value is fed to the machine controller (8). ### Claim 8 (depends on 1) Method according to claim 1, characterized in that a rolling stand (7) is raised when a predefined differential rolling force (ΔFW) is measured at it for a predefined time (tscrit), with the raised rolling stand being taken into account in the procedure according to claim 1. ### Claim 9 (depends on 1) Method according to claim 1, characterized in that a rolling stand (7) is raised when a predefined integral value of a differential rolling force (ΔFW) is exceeded at it over the time unit, with the raised rolling stand being taken into account in the procedure according to claim 1. ### Claim 10 (depends on 1) Method according to claim 1, characterized in that a rolling stand (7) is raised when an unevenness is detected on the strip at this rolling stand, which unevenness exceeds a predefined amount, with the raised rolling stand being taken into account in the procedure according to claim 1. ### Claim 11 (depends on 1) Method according to claim 1, characterized in that a rolling stand (7) is raised when a surface marking is detected on the strip at this rolling stand, which surface marking exceed a predefined amount, with the raised rolling stand being taken into account in the procedure according to claim 1. ### Claim 12 (depends on 1) Method according to claim 1, characterized in that a roller change is carried out on a raised rolling stand (7) while production continues, with the raised rolling stand being taken into account in the procedure according to claim 1. ### Claim 13 (depends on 1) Method according to claim 1, characterized in that when a rolling stand (7) fails it is raised, with the raised rolling stand being taken into account in the procedure according to claim 1. ### Claim 14 (depends on 1) Method according to claim 1, characterized in that the strip partitions of unequal thickness and/or temperature are cut out by shears.