DE19513999A1 - Steel strip prodn. line - Google Patents

Abstract

The prodn. line for steel strip comprises several work stations (1-9) arranged one after another, and is characterised by the fact that in the transport direction (F) of the strip (S) there is at least one branch line (NA1, NA2, NA3) as an alternative for the strip after the work stations (2,3,5). Also claimed is an application of the proposed line for prodn. of a strip, also from a continuously cast and hot-rolled material. Branching takes place by means of switch mechanisms (W1,W2,W3) whose state depends on the type of the strip (S) to be produced. The prodn. line comprises at least work stations for pickling, cold-rolling, annealing and finishing. Selectively, the prodn. line includes work stations for scale breaking before pickling, finishing or tempering following pickling, double redn. following annealing, stretch straightening, inspection, edge cutting, and oiling. The line includes two tandem double-redn. roll stands, with one of them serving for finish rolling of the strip. At least one of the work stations (2,3,5) has a strip storage unit (10,11,12) after it. The branch line (NA1, NA3) are provided with work stations (13,16,17,18). In front of at least one work station (1-9) there is a point in the prodn. line serving for return of the strip.

Description

The invention relates to a production line for Manufacture of steel strip with several of the steel strip processing stations run through one after the other. In Such production lines are in one continuous manufacturing process from low carbonized, unalloyed or weakly alloyed steels cold rolled steel strips. Low at these carbonized, unalloyed or weakly alloyed steels for example, it is also a bra (bake hardening), IF- (interstition free), DP- (dual phase), PM (partial martensite) or TRIP (transformation induced plasticity) steels.

In production lines known from practice the one as a hot strip in this steel strip fixed order of processing stations, in which it was stained one after the other, cold rolled, annealed and finally trained. The celebration predetermined sequence of processing steps for the known production lines entails that in these production lines only steel strip from one certain final quality or of a certain Final state can be established. Should therefore at a steel strip is manufactured from the same starting product be the one after passing through the production line should have a different condition than another steel strip, so must have its own for this purpose in practice Production line can be set up. Then this is  again only for the production of a single steel band Suitable type.

The object of the invention is a To create a production line of the type mentioned at the beginning, which allows a wide range of steel strips to manufacture.

This object is achieved in that in the conveying direction of the steel belt to at least one of the A branch is arranged following the processing stations, over which the steel strip from the production line into a Secondary wire is conductive.

A production line designed in this way has one Main processing line on which the steel strip goes through the usual processing steps. At the same time, however, each of the individual can Processing stations of this main line a branch be arranged over which in the production line Machined steel strip from the main wire into a secondary wire can be performed. This can be done in this secondary line Steel belt, if necessary, further processing stations go through that to produce a particular desired product are required. Likewise, too the secondary wire have branches on which the steel strip in further, the first subordinate subordinate Secondary cores can be fed.

The appropriate arrangement of branches behind the allows individual processing stations with the Production line according to the invention a wide range of finished tapes. So with the Production line according to the invention, for example pickled hot strip can be produced by behind the Pickling station of the production line over a steel belt  first branch from the production line becomes. By a corresponding arrangement of others Branch in the conveying direction behind the respective Processing stations can accordingly hot strip be produced, the stained or stained and re-rolled, d. H. is trained or tempered. Of further can be arranged by appropriate branches cold hardened cold rolled strip, or rolled, annealed and re-rolled (trained or annealed) cold strip or rolled, annealed and double-reduced cold strip can be produced in a single production line.

To the individual process steps in their temporal To be able to coordinate the process should be in Direction of conveyance of the steel belt to at least one of the Following a processing station arranged a tape storage his. Such a tape storage device can, depending on the equipment the production line between a pickling part and an am Start of the production line arranged following Tandemstraße, between the tandemstraße and one Kontiofen, between the Kontiofen and one Skin pass mill or between the continuous furnace and one Tandem double reduction mill can be arranged. The Tape storage can also be used to tune the Process steps are used that the steel strip goes through when there is a junction in a secondary vein to be led. This is especially true if that Steel band in the respective secondary vein further Processing stations such as that Hot strip re-rolling goes through.

The branches themselves should advantageously be as controllable switches are formed, the position in Depends on the type of manufactured Finished product is changeable.  

It is also favorable if in the conveying direction of the Steel strip in front of at least one of the machining a feed is arranged over which the Steel strip is traceable to the production line. At such an embodiment of the invention Production line it is possible to turn the steel strip around individual Processing stations of the production line in the manner of a Bypasses in a secondary line around certain machining around the main artery and then feed back into the main line.

The production line according to the invention is also for this suitable to produce steel strip from hot strip, which in a continuous casting and hot rolling process, in particular according to the CSP or the ISP procedure, has been generated.

The invention is based on two Drawing illustrating embodiments explained. Show it:

Fig. 1 shows a first production line in a schematic view;

Fig. 2 shows a second production line in a schematic view.

The production line H1 shown in FIG. 1 has a scale breaker 1 , a pickling section 2 , a tandem mill 3 , a degreasing device 4 , a continuous furnace 5 , a skin pass mill 6 , a stretching judge 7 , an inspection stand 8 in the conveying direction F of the steel strip S processed therein and an oiling machine 9 . These processing stations, together with a first belt store 10 arranged in the conveying direction F behind the pickling part, a second belt store 11 arranged in the conveying direction F after the degreasing device 4 and a third belt store 12 arranged in the conveying direction F behind the continuous furnace 5 form the main core of the production line H1. In the conveying direction F behind the first belt store 10 , a first switch W1 is arranged in the conveying path of the steel belt S. A second switch W2 is then positioned in the same way on tandem street 3 . Finally, a third switch W3 is arranged in the conveying direction F subsequent to the third belt store 12 in the conveying path of the steel belt S.

The switch W1 forms a first branch via which the steel strip S can be branched off into a first secondary core NA1. In the secondary wire NA1, the steel strip S first passes through a skin pass mill 13 and is then wound up on a winding device 14 .

The switch W2 forms a second branch of the main core of the production line H1, on which the steel strip S can be led out of the main core of the production line H1 into a secondary core NA2. In the secondary wire NA2, the steel strip is guided onto a winding device 15 .

Finally, the third switch W3 forms a third branch of the main core of the production line H1, on which the steel strip S can be guided into a third secondary core NA3 from the main core of the production line H1. The secondary wire NA3 in the conveying direction F of the steel strip S comprises a tandem double reduction roller mill 16 , an inspection stand 17 and an oiling machine 18 , to which a winding device 19 connects.

The skin pass mill 13 and the winding device 14 of the secondary wire NA1 or the winding device 15 of the secondary wire NA2 can be arranged in the vertical plane of the main wire of the production line H1, in a lower floor or in the underfloor level of the production line. In contrast, the processing stations of the secondary wire NA3 (tandem double reduction mill 16 , inspection stand 17 , oiling machine 18 ) and the winding device 19 should, due to the external dimensions of these elements, be positioned in a plane which is offset from the plane in which the processing stations, strip storage and switches of the Main wire of the production line H1 are arranged. To transfer the steel strip into the correspondingly arranged secondary wire NA3 of the exemplary embodiment of the invention shown in FIG. 1, guide rollers 20 are provided which are inclined at 45 ° and guide the steel strip S into the secondary wire NA3 after it has been diverted through the switch W3.

In the production line H2 shown in FIG. 2, the processing stations scale breaker 21 , pickling section 22 , tandem mill 23 , degreasing device 24 , continuous furnace 25 , tandem double reduction mill 26 , inspection stand 27 and oiling machine 28 are arranged in succession in the conveying direction F of the steel strip S. One of the stands of the tandem double reduction mill can work as a skin pass stand, with the second stand being open.

Following the pickling part 22 in the conveying direction F of the steel strip S, a first strip store 29 is provided. A second belt store 30 follows tandem street 23 . Finally, a third belt store 31 follows in the conveying direction F on the continuous furnace 25 . The band stores 29 , 30 , 31 together with the processing stations form the main core of the production line H2 shown in FIG. 2.

A first branch of this main wire is formed by a switch W4 which is arranged in the main wire of the production line H2 in the direction of conveyance F following the first band store 29 . Via the switch W4, the steel strip S can be passed into a first secondary wire NA4, in which it first passes through a skin pass mill 32 and is then wound up on a winding device 33 .

A second branch of the main wire of the production line H2 shown in FIG. 2 is formed by a switch W5 arranged between the tandem line 23 and the degreasing device 24 . The steel strip S can be guided via this switch to a second secondary wire NA5, in which it is wound on a winding device 34 .

Hot strip, which is initiated campaign-wise from a winding device 35 into the production lines H1, H2 shown in FIGS. 1 and 2, runs with the appropriate position of the switches W1, W2, W3 of the production line H1 and W4, W5 of the production line H2 in the main core of the respective production line H1, H2 and is processed therein to annealed and trained or annealed and double-reduced cold-rolled steel strip, which is wound up in a winding device 36 after passing through the respective main core. If pickled and re-rolled hot strip is to be produced in one of the production lines H1, H2 shown in FIGS. 1 or 2, the switch W1 or W4 is aligned for this purpose in such a way that the steel strip S is guided into the secondary wire NA1 or NA4 becomes. Cold-hardened cold rolled strip can be produced in a corresponding manner in the production lines H1, H2 shown in FIGS. 1 or 2 by setting the switches W2 and W5 in such a way that the steel strip S, after it has the scale breaker 1 and 21 , respectively Pickling section 2 or 22 , the first strip store 10 or 29 , which has passed tandem line 3 or 23 of the main core of the production lines H1 or H2, is guided into the secondary core NA2 or NA5, in which it is in the winding device 15 or 34 is only wound up. Finally, if a double-reduced cold strip is to be produced in the production line shown in FIG. 1 instead of the annealed and trained cold-rolled strip obtained after passing through the main wire, the switch W3 is set in the production line shown in FIG Secondary line NA3 is routed. In this it passes through the tandem double reduction mill 16 in order to obtain the desired end product.

During the production of the desired steel strip qualities using the main wire or the secondary wires of the production line shown in Fig. 1 or 2, the respectively unused secondary wires or the respectively unused section of the main wire stand still. In order to facilitate a change of the used secondary wire or a restart of the previously unused section of the main wire after the completion of the corresponding processing campaign, a pilot tape is inserted in the respectively unused secondary wires or the unused section of the main wire, with the help of which the new Steel strip S to be processed can be pulled into the relevant secondary wire or the relevant section of the main wire.

The production lines shown in FIGS . 1 and 2 are also suitable for processing hot strip which has been produced by the CSP or ISP process. It turns out in the processing of such hot strip that it already has the quality of a double-reduced finished cold strip after passing through the tandem street 3 or 23 , so the further processing sections of the respective main core of the production lines can be dispensed with. The end product of solidified pre-fabricated cold strip then results directly after the tandem mill and, after appropriate adjustment of the turnouts W2, W5, can leave the production lines via the secondary wire NA2, NA5.

Claims (11)

1. Production line for the production of steel strip with a plurality of processing stations ( 1-9 , 21-28 ) passed through by the steel strip, characterized in that in the conveying direction (F) of the steel strip (S) on at least one of the processing stations ( 2 , 3 , 5 , 22 , 23 ) a branch is arranged, via which the steel strip (S) from the production line can be guided into a secondary wire (NA1, NA2, NA3, NA4, NA5). 2. Production line according to claim 1, characterized in that the branch through a switch (W1, W2, W3, W4, W5) is formed, whose position depending on the Type of steel strip (S) to be changed is. 3. Production line according to one of claims 1 or 2, characterized in that the production line at least the processing stations

• - pickling,
• - cold rolling,
• - glow and
• - Dressage

includes.   4. Production line according to claim 3, characterized in that the production line optionally the additional processing stations

• - scaling prior to pickling,
• - after dressing or tempering,
• - trimming,
• - Double reduction after annealing
• - stretch straightening after the skin pass,
• - inspect,
• - trimming after inspection and
• - oiling after trimming

includes. 5. Production line according to one of the preceding claims, characterized in that it has two tandem double reduction rolling mill ( 26 ), one of which is used for dressing the steel strip (S). 6. Production line according to one of the preceding claims, characterized in that in the conveying direction (F) of the steel strip (S) on at least one of the processing stations ( 2 , 3 , 5 , 22 , 23 , 25 ) following a strip store ( 10 , 11 , 12th , 29 , 30 , 31 ) is arranged. 7. Production line according to one of the preceding claims, characterized in that the secondary wire (NA1, NA3, NA4) from the steel strip (S) branched off into the respective secondary wire (NA1, NA3, NA4) through processing stations ( 13 , 16 , 17 , 18 , 32 ). 8. Production line according to one of the preceding claims, characterized in that a feed is arranged in the conveying direction (F) of the steel strip (S) in front of at least one of the processing stations ( 1-9 , 21-28 ), via which the steel strip (S) in the production line is traceable. 9. Use of a production line according to one of the Claims 1 to 8 for the production of steel strip (S) also from hot strip, which is in a continuous Continuous casting and hot rolling processes, especially after the CSP or the ISP process is.