EP0035302A1
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A process for reducing the width of a flat metal product by rolling
Assignee: Tata Steel Ijmuiden BV
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Filing: 1981-02-20
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Granted: —
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Expires: 2001-02-20
Abstract
Abstract To reduce the width of slabs from a reheating furnace to the width required in a finishing rolling train, thereby making it possible to feed slabs of only one width, or only a few widths, into the reheating furnace, the invention proposes rolling the slab in a width-reducing roll train in which the slab is subjected to traction such that plastic deformation occurs between the roll sets. In particular the width-reducing roll train has only one set of thickness rolls and has one or more sets of width rolls, thereby minimizing the length of the roll train and consequently reducing the lengths at the ends of the slab which are not subjected to the traction.
Inventors
- 👤 Hans Bruinsma
- 👤 Frans Hollander
- 👤 Rein Lukas Huisman
- 👤 Adrianus G. Reinen
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-06 12:05
CPC Classifications
B; B21; B21B; B21B1/00; B21B1/46; B21B1/466; B21B1/02; B21B1/04
Claims Analysis
Total Claims: 17
Claim 1
Independent Claim
125 words
A process of reducing the width of a flat metal product (3) by rolling, wherein the product is passed through at least one width-reducing roll train (1,2) having width rolls (2) and thickness rolls (1) with the width-reducing roll train applying a sufficiently high traction force to the product between the first and last sets of rolls in the width-reducing roll.train that plastic deformation of the product occurs between sets of rolls in the width-reducing roll train, characterized in that: the product (3) is a discrete slab and in that the said width-reducing roll train has only one set of thickness rolls (1) and has, upstream of said set of thickness rolls (1) in the rolling direction at least one set of width rolls (2).
Claim 2
Dependent Claim
125 words
A process of reducing the width of a flat metal product (3) by rolling, wherein the product is passed through at least one width-reducing roll train (1,2) having width rolls (2) and thickness rolls (1) with the width-reducing roll train applying a sufficiently high traction force to the product between the first and last sets of rolls in the width-reducing roll.train that plastic deformation of the product occurs between sets of rolls in the width-reducing roll train, characterized in that: the product (3) is a discrete slab and in that the said width-reducing roll train has only one set of thickness rolls (1) and has, upstream of said set of thickness rolls (1) in the rolling direction at least one set of width rolls (2).
Claim 3
Dependent Claim
29 words
A process according to claim 1 wherein the said width-reducing roll train contains one set of width rolls (5) downstream of the said one set of thickness rolls (1).
Claim 4
Dependent Claim
31 words
A process according to claim 1 or claim 2 wherein the said width-reducing roll train contains two sets of width rolls (2,4) upstream of said one set of thickness rolls (1).
Claim 5
Dependent Claim
41 words
A process according to claim 1 wherein the said width-reducing roll train contains two sets of width rolls upstream of said one set of thickness rolls and one set of width rolls downstream of the said one set of thickness rolls.
Claim 6
Dependent Claim
114 words
A process as claimed in any one of the preceding claims wherein the maximum width reduction per pass produced by width rolling in said width reducing roll train (whilst maintaining an acceptable cross sectional shape) is given by the formula: where B o = the width of the metal product at the entry into the roll train, B u = the width of the metal product at the exit from the roll train. H o = the thickness of the metal product at the entry into the roll train, V = a shape factor with a maximum value equal to approximately 3 for a value of B o equal to approximately 10. H 0
Claim 7
Dependent Claim
18 words
A process according to any one of the preceding claims wherein the metal product is a steel slab.
Claim 8
Dependent Claim
43 words
A process according to claim 6 wherein the said width-reducing roll train acts upon the slab after the slab has been heated in a reheating furnace (140) and before the slab is rolled in a finishing train (144) of a hot strip mill.
Claim 9
Dependent Claim
33 words
A process according to claim 7 wherein the slab is produced in a continuous casting machine (11) or a slabbing mill (15), and is transported while still hot into said reheating furnace (140).
Claim 10
Dependent Claim
31 words
A process according to any one of the preceding claims wherein the metal product is subjected to width reduction in each of a plurality of passes through said width-reducing roll train.
Claim 11
Dependent Claim
32 words
A process according to any one of the preceding claims 1 to 8 wherein the metal product is passed once only through each of one or more of said width-reducing roll train.
Claim 12
Dependent Claim
149 words
A process of hot rolling steel strip from a slab comprising heating the slab in a reheating furnace (140) and thereafter rolling the hot slab into a strip in a finishing train (144) having a plurality of roll stands in which the width of the slab is not substantially altered, characterized in that: after heating in the reheating furnace and prior to rolling in said finishing roll train, the slab is rolled to the desired width for the finishing roll train in a width-reducing roll train (141) which has at least one set of width rolls (2) and at least one set of thickness rolls (1) and in which a traction force is applied to the slab between the first and last sets of rolls in the width-reducing roll train (141) so that plastic deformation of the slab occurs between sets of rolls in the width-reducing roll train (141).
Claim 13
Dependent Claim
149 words
A process of hot rolling steel strip from a slab comprising heating the slab in a reheating furnace (140) and thereafter rolling the hot slab into a strip in a finishing train (144) having a plurality of roll stands in which the width of the slab is not substantially altered, characterized in that: after heating in the reheating furnace and prior to rolling in said finishing roll train, the slab is rolled to the desired width for the finishing roll train in a width-reducing roll train (141) which has at least one set of width rolls (2) and at least one set of thickness rolls (1) and in which a traction force is applied to the slab between the first and last sets of rolls in the width-reducing roll train (141) so that plastic deformation of the slab occurs between sets of rolls in the width-reducing roll train (141).
Claim 14
Dependent Claim
44 words
A process according to claim 11 wherein the said width-reducing roll train has only one set of thickness rolls (1) and has, upstream of the said set of thickness rolls (1) in the direction of rolling, at least one set of width rolls (2).
Claim 15
Dependent Claim
28 words
A process according to claim 12 wherein the said width-reducing roll train has a set of width rolls (5) downstream of the said set of thickness rolls (1).
Claim 16
Dependent Claim
31 words
A process according to claim 12 or claim 13 wherein the said width-reducing roll train has two sets of width rolls (2,4) upstream of the said set of thickness rolls (1).
Claim 17
Dependent Claim
37 words
A process according to any one of claims 11 to 14 wherein the slab is produced in a continuous casting machine (11) or a slabbing mill (15) and is transported while still hot into said reheating furnace.
References Cited (Backward Citations)
US3757556A
Cited
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