# US 9,039,956 B2 · Cooling system for hot-rolled steel strip

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- Number: US 9,039,956 B2
- Document ID: US9039956B2
- Status: Granted
- Kind: B2
- Application number: 13/825,373
- Filed: 2011-09-05
- Published: 2013-09-26
- Granted: 2015-05-26
- Earliest claimed: 2010-09-22
- Assignees: Mitsubishi-Hitachi Metals Machinery, Inc.; Nippon Steel & Sumitomo Metal Corporation
- Applicants: Koichi Matsumoto; Yuji Ikemoto; Yoichi Haraguchi; Kazuaki Kobayashi
- Inventors: Koichi Matsumoto; Yuji Ikemoto; Yoichi Haraguchi; Kazuaki Kobayashi
- Web page: https://patentgrep.com/patent/US9039956B2

## CPC

- C21D 1/667: for spray quenching
- B21B 39/16: immediately before entering or after leaving the pass
- B21B 45/0218: {for strips, sheets, or plates (B21B45/023, B21B45/0233 take precedence)}
- B21B 45/0233: {Spray nozzles, Nozzle headers; Spray systems}
- B21B 2027/103: {cooling externally}
- 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)
- 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)

## Abstract

Provided is a cooling system for a hot-rolled steel strip capable of increasing the cooling rate for rapidly cooling a rolled steel immediately after rolling and suitable for an apparatus for manufacturing a hot-rolled steel strip having a fine-grained structure. For this purpose, guides (16A, 16B) having guiding surfaces (16a, 16b) to guide a rolled steel (W) exiting work rolls (12A, 12B) in the conveyance direction are provided at exits of the work rolls in a final stand (Sn) of a finish rolling mill line in a manner that the guides can follow a change in the diameter of the work rolls, a number of injection holes (21A, 21B) are formed in the guides, and a number of rolled steel cooling nozzles (23A, 23B) are provided to spray a large amount of cooling water through the injection holes directly onto the rolled steel.

## Claims

### Claim 1

A cooling system for a hot-rolled steel strip, comprising:
a guide provided on a delivery side of a work roll in a last stand of a hot finishing mill line, the guide including a large number of jet holes formed in the guide and a guide face for guiding a rolled material, leaving from the work roll, in a conveyance direction of the rolled materials;
roll cooling nozzles provided, on the delivery side of the work roll, for jetting cooling water to the work roll; and
rolled material cooling nozzles attached to a nozzle block, for jetting cooling water directly to the rolled material through the jet holes, wherein
the guide is swingably coupled by pins to the nozzle block via brackets, and is urged by a weight placed on a proximal end of the guide or by own weight of the guide such that a distal end of the guide is always brought in contact with a surface of the work roll, and capable of advancing and retreating in the conveyance direction of the rolled material via the nozzle block, and
the roll cooling nozzles are attached to the nozzle block.

### Claim 2 (depends on 1)

The cooling system for a hot-rolled steel strip according to claim 1, wherein
a separating member is provided for preventing the cooling water, jetted from the roll cooling nozzles, from hitting the rolled material through the jet holes of the guide.

### Claim 3 (depends on 2)

The cooling system for a hot-rolled steel strip according to claim 2, wherein the separating member is made of a flexible member which is connected, at one end thereof, to the guide so as to be capable of allowing the following action of the guide.

### Claim 4 (depends on 1)

The cooling system for a hot-rolled steel strip according to claim 1, wherein the rolling mill is a cross mill crossing at least the work roll.

### Claim 5 (depends on 4)

The cooling system for a hot-rolled steel strip according to claim 4, wherein a position adjusting apparatus making the guide capable of following the crossing state of the work roll is provided, and the position adjusting apparatus also has a function serving as a mechanism to cause the guide to advance to and retreat from the work roll.