Claims
- 1. A method of producing a hot rolled wide strip having a predetermined length, comprising the steps of:
- providing a rolling mill train including a break-down train having at least one stand, a roller hearth furnace arranged downstream of the break-down train, cropping shears arranged downstream of the roller hearth furnace, high pressure descaling means arranged downstream of the cropping shears, a finishing train having a plurality of stands arranged downstream of the descaling means, and a cooling path arranged downstream of the finishing train;
- rolling the strip in the break-down train; thereafter, equalizing temperature of the hot rolled wide strip leaving the break-down train along an entire length of the strip to a predetermined constant temperature in the roller heath furnace;
- delivering the strip from the roller hearth furnace through the cropping shears and the descaling measn to an inlet of a first stand of the finishing train at a same constant velocity;
- operating the finishing train at a constant rolling velocity, whereby the entire length of the strip leaves the finishing train ay a constant temperature between about 700.degree. C. to about 930.degree. C.; and
- cooling the hot rolled wide strip, which exits the finishing train, at a constant cooling speed to a constant reeling temperature in a cooling path.
- 2. A method according to claim 1, further comprising the step of heating the hot rolled wide strip leaving the break-down train in an inducting heating section provided upstream of the roller hearth furnace.
- 3. A method according to claim 1, wherein the equalizing temperature step includes heating the roller hearth furnace by one of oil and gas.
- 4. A method according to claim 1, wherein the step of rolling the strip in the break-down train includes rolling the strip to an intermediate thickness from about 25 mm to about 60 mm.
- 5. A method according to claim 1, wherein velocity of the strip leaving the roller hearth furnace varies in a range from about 0.1 m/sec to about 1.5 m/sec.
Priority Claims (1)
Number |
Date |
Country |
Kind |
41 29 749.0 |
Sep 1991 |
DEX |
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RELATED APPLICATIONS
This is a continuation-in-part of application Ser. No. 08/161,996 filed Dec. 2, 1993 (now abandoned) which is a continuation of application Ser. No. 07/934,990, filed Aug. 25, 1992 (now abandoned).
US Referenced Citations (5)
Continuations (1)
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Number |
Date |
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Parent |
934990 |
Aug 1992 |
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Continuation in Parts (1)
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Number |
Date |
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161996 |
Dec 1993 |
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