Strip steel double-line production system

Abstract

The utility model relates to a strip steel double-line production system which comprises a production line A and a production line B. The production line A comprises a rough rolling unit, a line A swing section unit and a finish rolling unit which are sequentially arranged in a collinear mode. The production line B comprises a thin slab continuous casting machine, a line B fixed section tunnel furnace and a line B swing section tunnel furnace suitable for being in swing butt joint with the line A swing section unit which are collinearly arranged in sequence; and the upstream of the rough rolling unit is connected with a plate blank heating furnace. The strip steel double-line production system provided by the utility model can realize hot rolling joint production of a thin slab and a conventional slab, and is high in process flexibility; through cooperation of the A-line swing section unit and the B-line swing section tunnel furnace, the sheet billet production line supplies billets to the conventional sheet billet production line in a swing mode, the sheet billet production line and the conventional sheet billet production line can share a finish rolling unit, and therefore reasonable coupling of the two production lines is achieved.

Description

Technical Field

[0001] The utility model belongs to the technical field of metallurgical production, and specifically relates to a double-line production system for strip steel. Background Art

[0002] CSP production line is the earliest developed hot strip production line using continuous casting and rolling technology. Compared with conventional slab hot rolling, CSP production line has outstanding advantages such as high yield rate, large proportion of thin-gauge products, thinnest product specifications, high product dimensional accuracy, small unit footprint, low energy consumption per ton of steel, low exhaust gas emissions, low new water consumption, and low roll consumption.

[0003] However, due to production process restrictions, the CSP production line has great limitations in the production of high-performance steel grades such as ultra-deep drawing soft steel, high-grade non-oriented silicon steel, oriented silicon steel, and pipeline steel above X80; and due to the capacity limitations of the CSP casting machine, its output is smaller than that of conventional slab hot rolling, resulting in a high investment per ton of steel.

[0004] Although the CSP production line can be mechanically combined with the conventional slab hot rolling line, equipping each of them with a finishing mill obviously leads to problems such as large equipment investment and high operating costs. Therefore, how to reliably achieve the coupling of the CSP production line and the conventional slab hot rolling line is an issue that needs to be solved urgently. Utility Model Content

[0005] The utility model relates to a double-line production system for strip steel, which can at least solve some defects of the prior art.

[0006] The utility model relates to a double-line production system for strip steel, comprising an A production line and a B production line, wherein the A production line comprises a co-linearly arranged rough rolling unit, an A-line swing section unit and a finishing rolling unit;

[0007] The B production line comprises a thin slab continuous casting machine, a B line fixed section tunnel furnace and a B line swing section tunnel furnace suitable for swinging and docking with the A line swing section unit.

[0008] A slab heating furnace is connected upstream of the rough rolling unit.

[0009] As one of the implementation modes, the A-line swing section unit is an A-line swing section insulation roller.

[0010] As one of the implementation modes, the rough rolling unit adopts a reversible rolling mill.

[0011] As one of the implementation modes, an A-line fixed section unit which can at least keep the slab warm is further arranged between the A-line swing section unit and the finishing unit.

[0012] As one of the implementation modes, the A-line fixed section unit is an A-line fixed section tunnel furnace or an A-line fixed section insulation roller conveyor.

[0013] As one of the implementation modes, when the A-line fixed section unit is an A-line fixed section insulation roller, a pre-finishing-rolling heating unit for supplementing heating of the slab is provided between the A-line fixed section unit and the finishing unit.

[0014] As one of the implementation modes, the pre-finishing rolling heating unit includes an induction heater.

[0015] As one of the implementation modes, the rough rolling unit includes two rough rolling mills, and the two rough rolling mills are arranged in series.

[0016] The utility model has at least the following beneficial effects:

[0017] The double-line production system for strip steel provided by the utility model can realize the hot rolling joint production of thin slabs and conventional slabs, and has high process flexibility; through the cooperation of the A-line swing section unit and the B-line swing section tunnel furnace, the thin slab production line is swung to supply slabs to the conventional slab production line, and the finishing unit can be shared with the conventional slab production line, thereby realizing the reasonable coupling of the two production lines. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0019] Figure 1 A schematic structural diagram of a double-line production system for strip steel (single-stand roughing mill) provided in an embodiment of the utility model;

[0020] Figure 2 A schematic structural diagram of a dual-line production system for strip steel (dual-stand roughing mill) provided in an embodiment of the utility model. DETAILED DESCRIPTION

[0021] The technical solutions in the embodiments of the present invention are described clearly and completely below. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0022] like Figure 1 and Figure 2The utility model provides a double-line production system for strip steel, including production line A and production line B.

[0023] The A production line comprises a rough rolling unit 22, an A line swing section unit 23 and a finishing rolling unit 3 which are arranged in sequence on the same line;

[0024] The B production line comprises a thin slab continuous casting machine 11, a B line fixed section tunnel furnace 12 and a B line swing section tunnel furnace 13 adapted to swing and dock with the A line swing section unit 23.

[0025] A slab heating furnace 21 is connected upstream of the rough rolling unit 22 .

[0026] The above-mentioned production line A can perform hot rolling production of conventional slabs, for example, for processing medium-thick slabs with a thickness of 150 to 250 mm.

[0027] The rough rolling unit 22 includes a rough rolling mill group, which may include one or more rough rolling mills, preferably a reversible rolling mill; Figure 2 In the illustrated solution, two roughing mills are arranged in series; in another arrangement, two roughing mills are arranged with an interval therebetween.

[0028] The slab heating furnace 21 is preferably a walking beam heating furnace, and one or more furnaces may be arranged.

[0029] In one embodiment, the running direction of the slab in the slab heating furnace 21 is parallel to the longitudinal direction of the A production line, wherein the longitudinal direction of the A production line is also the length direction of the A production line, corresponding to the running direction of the slab on the A production line. This arrangement can save the horizontal space of the plant area (the horizontal direction is perpendicular to the longitudinal direction of the A production line) and improve the compactness of the production line layout. Among them, the conveying direction of the furnace roller 211 of the slab heating furnace 21 is perpendicular to the longitudinal direction of the A production line. The furnace roller 211 is preferably arranged outside the A production line. A turntable is arranged at the inlet side of the rough rolling unit 22 and connected with the furnace roller 211. The turntable is used to rotate the slab 90° to ensure that the slab can continue to be transported on the A production line. Among them, the rough rolling unit can be connected with the above-mentioned turntable through the pre-rough rolling insulation roller. Further, a pre-rough rolling descaling machine can be arranged in the above-mentioned furnace roller 211, and a width setting machine can be arranged in the furnace roller 211; when the pre-rough rolling descaling machine and the width setting machine are arranged at the same time, the width setting machine is preferably arranged downstream of the pre-rough rolling descaling machine.

[0030] In another embodiment, Figure 1 and Figure 2, the slab running direction in the slab heating furnace 21 is perpendicular to the longitudinal direction of the A production line; for this arrangement, optionally, the furnace discharge roller 211 of the slab heating furnace 21 is arranged in line upstream of the rough rolling unit 22, and the rough rolling unit can be connected with the furnace discharge roller 211 through the pre-roughing insulation roller. Among them, a pre-roughing descaling machine can be arranged in the furnace discharge roller 211; a width setting machine can be arranged in the furnace discharge roller 211 or the pre-roughing insulation roller.

[0031] The above-mentioned A-line swing section unit 23 can adopt an A-line swing section tunnel furnace, but more preferably, the A-line swing section unit 23 adopts an A-line swing section insulation roller. This method can effectively avoid the high-speed slab repeatedly impacting the A-line swing section tunnel furnace during the rough rolling mill, especially reversible rolling, causing damage to the furnace rollers, furnace shell, steel piling and other accidents. The use of a swing section insulation roller can better withstand such impact.

[0032] Furthermore, if Figure 1 and Figure 2 A fixed section unit 24 of the line A is arranged between the swing section unit 23 of the line A and the finishing unit 3, which can at least keep the slab warm. The fixed section unit 24 of the line A can heat the intermediate slab after rough rolling, which is beneficial to rolling thin intermediate slabs and improving the quality of subsequent finishing rolling. It can also be used to heat the thin slab of the line B, reduce the temperature drop of the thin slab, and facilitate the subsequent finishing production.

[0033] In one embodiment, the A-line fixed section unit 24 is an A-line fixed section tunnel furnace, which is far away from the roughing mill. The repeated impact of the reversible rolling of the roughing mill is not easily transmitted to the A-line fixed section tunnel furnace, and the slab speed here is relatively low, and the impact on the furnace rollers is relatively small, thereby ensuring the life of the A-line fixed section tunnel furnace.

[0034] In another embodiment, the A-line fixed section unit 24 is a fixed section insulation roller of the A-line. In this case, the B-line thin slab will have a relatively large temperature drop loss due to the long transportation distance (a temperature drop of 100°C may occur). Based on this, a pre-finishing heating unit is set between the A-line fixed section insulation roller and the finishing unit 3 to supplement the heat of the slab, which is beneficial to the subsequent finishing production. The pre-finishing heating unit includes but is not limited to an induction heater.

[0035] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A double-line production system for strip steel, characterized in that: It includes production line A and production line B, wherein production line A includes a rough rolling unit, a line A swing section unit and a finishing rolling unit which are sequentially arranged in the same line; The B production line comprises a thin slab continuous casting machine, a B line fixed section tunnel furnace and a B line swing section tunnel furnace suitable for swinging and docking with the A line swing section unit. A slab heating furnace is connected upstream of the rough rolling unit.

2. The double-line production system for strip steel according to claim 1, characterized in that: The A-line swing section unit is an A-line swing section insulation roller.

3. The double-line production system for strip steel according to claim 1 or 2, characterized in that: The rough rolling unit adopts a reversible rolling mill.

4. The double-line production system for strip steel according to claim 1 or 2, characterized in that: An A-line fixed section unit which can at least keep the slab warm is also arranged between the A-line swing section unit and the finishing unit.

5. The double-line production system for strip steel according to claim 4, characterized in that: The A-line fixed section unit is an A-line fixed section tunnel furnace or an A-line fixed section insulation roller conveyor.

6. The double-line production system for strip steel according to claim 5, characterized in that: When the A-line fixed section unit is an A-line fixed section heat-insulating roller, a pre-finishing-rolling heating unit for supplementing heating of the slab is provided between the A-line fixed section unit and the finishing unit.

7. The double-line production system for strip steel according to claim 6, characterized in that: The pre-finishing rolling heating unit includes an induction heater.

8. The double-line production system for strip steel according to claim 1, characterized in that: The rough rolling unit comprises two rough rolling mills, and the two rough rolling mills are arranged in series.

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