# US 5,702,338 A · Heat treating, annealing and tunnel furnace rolls

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- Number: US 5,702,338 A
- Document ID: US5702338A
- Status: Granted
- Kind: A
- Application number: 08/540,880
- Filed: 1995-10-11
- Granted: 1997-12-30
- Earliest claimed: 1993-03-24
- Inventors: Jorge A. Morando
- Web page: https://patentgrep.com/patent/US5702338A

## CPC

- F27D 3/026: {transport or conveyor rolls for furnaces; roller rails}
- B21B 39/008: {Rollers for roller conveyors (roller-ways in general B65G13/00, B21B39/00)}
- C21D 9/563: {Rolls; Drums; Roll arrangements}
- F27D: DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
- 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

A furnace roll for transferring steel strips from an annealing furnace has several spaced rings along the body of the roll. The rings have a width and diameter chosen such that the load on each ring is optimized depending upon the material of the strip and the ring material. The selected ring material is relatively insoluble with the strip material.

## Claims

### Claim 1

A roll for transporting a heated, metal strip material comprising:
an elongated roll body; and
a plurality of generally circumferential wear rings encircling said roll body,
wherein each of said wear rings has a radius extending greater than the radial dimension of said roll,
said wear rings having an outer surface adapted for contacting and supporting said metal strip material during transport thereof,
and wherein said outer surface is composed of a metal or metal alloy whose constituent metals have low coefficients of adhesion in compression with respect to said strip material being transported and supported by said rolls.

### Claim 2 (depends on 1)

A roll according to claim 1, wherein said wear ring outer surface is composed of an alloy containing at least one metal selected from the group consisting of chromium carbide, tungsten carbide, and vanadium carbide.

### Claim 3 (depends on 1)

A roll according to claim 1, wherein said outer surface of said wear ring has a high carbon content.

### Claim 4 (depends on 1)

A roll according to claim 1, wherein said outer surface of said wear ring is composed of an alloy containing the following constituents in the indicated ranges:
______________________________________ % % ______________________________________ 10.0< Ni <30.0 20.0< Cr <40.0 0.4< C <1.8 2.0< W <10.0 0.5< Mo <1.5 4.0< Co <30.0 0.8< Si <2.5 1.0< Mn <2.0 0.0< V <10.0 ______________________________________

### Claim 5 (depends on 1)

A roll according to claim 1, wherein the width of said wear rings is determined by establishing an optimum real area of contact, A.sub.r, between said wear rings and said strip material and according to the formula A.sub.r =L/NP, wherein
A.sub.r is the optimum real area of contact;
L is the load of said strip material on said wear rings;
N is the number of rings; and
P is the penetration hardness of the strip material at the operating temperature range of said strip material during the time period when it is in contact with said wear ring outer surface, so as to reduce adhesion forces between said wear ring surface and said metal strip material to a required minimum value.

### Claim 6 (depends on 1)

A roll according to claim 1, wherein said wear ring is integrally attached to said roll body.

### Claim 7 (depends on 1)

A roll according to claim 1, wherein said wear ring is replaceably attached to said roll body.

### Claim 8

A roll for transferring a flat, heated strip of a first steel alloy from an annealing furnace, comprising:
an elongated tubular body having a longitudinal axis;
shaft means attached to opposite ends of the body for supporting the body for rotation about the axis; and
structure integrally disposed on said body forming a discontinuous surface for contacting and supporting the flat heated strip on the tubular body as the tubular body is being rotated, said structure being formed of a second steel alloy that is relatively insoluble with respect to the first steel alloy of the heated strip, said structure having a material chemical composition limits of:
______________________________________ % % ______________________________________ 10.0 <N.sub.i <30.0 20.0 <C.sub.R <40.0 0.4 <C <1.8 2.0 <W <10.0 0.5 <M.sub.O <1.5 4.0 <C.sub.O <30.0 0.8 <S.sub.i <2.5 1.0 <Mn <2.0 0.0 <V <10.0 ______________________________________

### Claim 9 (depends on 8)

A roll as defined in claim 8, in which the structure comprises longitudinally spaced rings attached to the cylindrical surface of the body.

### Claim 10 (depends on 9)

A roll as defined in claim 9, in which the width and diameter of the ring is chosen to minimize the adhesion forces between each ring and the steel strip.

### Claim 11 (depends on 10)

A roll as defined in claim 10, in which the area of contact between the steel strip and the roll is chosen according to the formula L/P, in which the L is the load of the strip on the ring and P is the penetration hardness of the strip material at the furnace operating temperature.

### Claim 12 (depends on 11)

A roll as defined in claim 11, in which the area of contact between the steel strip and the roller is chosen according to the formula L/.sigma.y in which the L is the load of the strip on the ring, and .sigma.y is the material strength of the strip material in compression.

### Claim 13 (depends on 9)

A roll as defined in claim 9, in which a ring is replaceably welded to the body.

### Claim 14 (depends on 8)

A roll as defined in claim 8, in which the area of contact between the steel strip and the structure on the roll is chosen according to the formula L/P, in which L is the load of the strip on the ring and P is the penetration hardness of the strip material at the furnace operating temperature.

### Claim 15

A roll for transferring a flat heated strip of a first steel alloy from an annealing furnace, comprising:
an elongated tubular body having a longitudinal axis;
shaft means attached to opposite ends of the body for supposing the body for rotation about said axis;
integral structure of a second steel alloy forming longitudinally spaced enlargements on the tubular body for contacting and supporting the flat steel strip as the tubular body is being rotated;
the enlargements having a surface area contacting the steel strip, the surface area being capable of minimizing either removal of the second steel alloy from said integral structure by the heated strip, or removal of the first steel alloy from the heated strip by the integral body structure.

### Claim 16 (depends on 15)

A roll as defined in claim 15, in which the surface area of the enlargements contacting the steel strip is chosen according to the formula L/P, in which L is the load of the strip on the enlargements, and P is the penetration hardness of the strip material at the furnace operating temperature.

### Claim 17 (depends on 15)

A roll as defined in claim 15, in which the enlargements are attached to the tubular body adjacent the areas of contact of the enlargements with the heated strip.

### Claim 18 (depends on 8)

A roll as defined in claim 8, in which the structure is replaceably welded to the tubular body.

### Claim 19

A roll for transferring a flat, heated strip of a steel alloy from an annealing furnace, comprising:
an elongated tubular body having a longitudinal axis, and adapted to be supported with said axis in a horizontal position;
shaft means attached to opposite ends of the body for supporting the body for rotation about said axis;
a plurality of annular members disposed in longitudinally spaced positions along the tubular body and about the longitudinal axis thereof, each annular member having an annular surface for contacting and supporting the heated strip for horizontal motion; and
each of said annular members being integrally attached to the body to prevent motion of the annular member with respect to the tubular body.

### Claim 20

A roll for transferring a heated strip of a first steel alloy, comprising:
an elongated tubular body having a longitudinal axis;
shaft means attached to opposite ends of the body for supporting the body for rotation about the axis; and
structure integrally disposed on said body for contacting and supporting the heated strip on the tubular body as the tubular body is being rotated, said structure being formed of a second steel alloy that is relatively insoluble with respect to the first steel alloy of the heated strip, said structure having a material chemical composition limits of:
______________________________________ % % ______________________________________ 10.0 <N.sub.i <30.0 20.0 <C.sub.R <40.0 0.4 <C <1.8 2.0 <W <10.0 0.5 <M.sub.O <1.5 4.0 <C.sub.O <30.0 0.8 <S.sub.i <2.5 1.0 <Mn <2.0 0.0 <V <10.0 ______________________________________