Thin slab and conventional slab hot continuous rolling combined unit

Abstract

The utility model relates to a thin slab and conventional slab hot continuous rolling combined unit which comprises a thin slab production line and a conventional slab production line, and the thin slab production line comprises a thin slab continuous casting machine, a fixed section tunnel furnace and a transverse moving section tunnel furnace which are collinearly arranged in sequence; the conventional plate blank production line comprises a rough rolling unit, a transverse moving section unit and a finish rolling unit which are collinearly arranged in sequence; wherein the transverse moving section unit is suitable for transversely moving towards one side far away from a sheet billet production line, and the transverse moving section tunnel furnace is suitable for transversely moving between the sheet billet production line and a conventional sheet billet production line; and the upstream of the rough rolling unit is connected with a plate blank heating furnace. According to the utility model, hot rolling joint production of a thin slab and a conventional slab can be realized, and the process flexibility is high; through cooperation of the transverse moving section tunnel furnace and the transverse moving section unit, the sheet billet production line transversely moves to supply billets to the conventional sheet billet production line and can share the finish rolling unit with the conventional sheet billet production line, 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 in particular relates to a hot continuous rolling combined unit for thin slabs and conventional slabs. 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 thin slab and conventional slab hot continuous rolling combined unit, which can at least solve part of the defects of the prior art.

[0006] The utility model relates to a thin slab and conventional slab hot continuous rolling combined unit, comprising a thin slab production line and a conventional slab production line.

[0007] The thin slab production line comprises a thin slab continuous casting machine, a fixed section tunnel furnace and a transverse section tunnel furnace which are arranged in sequence on the same line;

[0008] The conventional slab production line comprises a rough rolling unit, a traverse section unit and a finishing rolling unit which are arranged in sequence on the same line;

[0009] Wherein, the transverse moving section unit is suitable for transversely moving to a side away from the thin slab production line, and the transverse moving section tunnel furnace is suitable for transversely moving between the thin slab production line and the conventional slab production line;

[0010] A slab heating furnace is connected upstream of the rough rolling unit.

[0011] As one of the implementation modes, the transverse section unit is a transverse section insulation roller.

[0012] As one of the implementation modes, the rough rolling unit adopts a reversible rolling mill.

[0013] As one of the implementation modes, the transverse track of the transverse section tunnel furnace is connected in series with the transverse track of the transverse section unit.

[0014] As one of the embodiments, the rough rolling unit includes a rough rolling mechanism and a pre-roughing insulation roller and a post-roughing insulation roller respectively arranged upstream and downstream of the rough rolling mechanism. The pre-roughing insulation roller is connected to the slab heating furnace, and the post-roughing insulation roller is connected to the transverse section unit.

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

[0016] As one of the implementation modes, the rough rolling mechanism includes two rough rolling mills, which are arranged at an interval and an intermediate heat-insulating roller conveyor is provided between the two rough rolling mills.

[0017] As one of the implementation modes, the discharge rollers of the slab heating furnace are arranged in a co-linear manner upstream of the rough rolling unit.

[0018] As one of the implementation modes, a width sizing machine is arranged between the rough rolling unit and the slab heating furnace.

[0019] As one of the implementation modes, the slab heating furnace is a walking beam heating furnace.

[0020] The utility model has at least the following beneficial effects:

[0021] 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 transverse moving section tunnel furnace and the transverse moving section unit, the thin slab production line can be transversely moved to the conventional slab production line to supply billets, 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

[0022] 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.

[0023] Figure 1 A schematic diagram of the structure of a thin slab and conventional slab hot rolling combined mill provided in an embodiment of the utility model;

[0024] Figure 2 It is a schematic diagram of the application status of the thin slab and conventional slab hot rolling combined unit. DETAILED DESCRIPTION

[0025] 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.

[0026] like Figure 1 and Figure 2 The utility model provides a thin slab and conventional slab hot rolling joint unit, including a thin slab production line and a conventional slab production line.

[0027] The thin slab production line comprises a thin slab continuous casting machine 11, a fixed section tunnel furnace 12 and a transverse section tunnel furnace 13 which are arranged in sequence on the same line;

[0028] The conventional slab production line comprises a rough rolling unit 22, a traverse section unit 23 and a finishing rolling unit 3 which are arranged in sequence on the same line;

[0029] The transverse moving section unit 23 is suitable for transversely moving to a side away from the thin slab production line, and the transverse moving section tunnel furnace 13 is suitable for transversely moving between the thin slab production line and the conventional slab production line;

[0030] A slab heating furnace 21 is connected upstream of the rough rolling unit 22 .

[0031] The conventional slab production line is used to perform hot rolling production of conventional slabs, for example, to process medium-thick slabs with a thickness of 150 to 250 mm.

[0032] Among them, the roughing unit 22 includes a roughing mechanism 221, and the roughing mechanism 221 may include one or more roughing mills, preferably a reversible rolling mill; optionally, two roughing mills are arranged, and the two roughing mills are arranged in series; in another embodiment, two roughing mills are arranged, and the two roughing mills are arranged at intervals. In this case, it is preferred to set an intermediate insulation roller between the two.

[0033] The slab heating furnace 21 is preferably a walking beam heating furnace, and one or more furnaces may be arranged.

[0034] In one embodiment, the running direction of the slab in the slab heating furnace 21 is parallel to the longitudinal direction of the conventional slab production line, wherein the longitudinal direction of the conventional slab production line is also the length direction of the conventional slab production line, corresponding to the running direction of the slab on the conventional slab production line. This arrangement can save the horizontal space of the plant area (the horizontal direction is perpendicular to the longitudinal direction of the conventional slab 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 conventional slab production line. The furnace roller 211 is preferably arranged outside the conventional slab 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 conventional slab production line. Among them, the rough rolling mechanism 221 can be connected with the above-mentioned turntable through the intermediate roller before rough rolling. Furthermore, a descaling machine before rough rolling can be arranged in the above-mentioned discharge roller 211, and a width setting machine can be arranged in the discharge roller 211; when a descaling machine before rough rolling and a width setting machine are arranged at the same time, the width setting machine is preferably arranged downstream of the descaling machine before rough rolling.

[0035] In another embodiment, Figure 1 and Figure 2 , the running direction of the slab in the slab heating furnace 21 is perpendicular to the longitudinal direction of the conventional slab production line; for this arrangement, optionally, the furnace roller 211 of the slab heating furnace 21 is arranged in line upstream of the rough rolling unit 22, and the rough rolling mechanism 221 can be connected with the furnace roller 211 through the pre-roughing insulation roller 222. Among them, a pre-roughing descaling machine can be arranged in the furnace roller 211; a width setting machine can be arranged in the furnace roller 211 or the pre-roughing insulation roller 222.

[0036] After the transverse moving section unit 23 is transversely moved to the side away from the thin slab production line, an avoidance space can be left to facilitate the transverse moving section tunnel furnace 13 to be transversely moved to the conventional slab production line to complete the transverse supply of thin slabs.

[0037] In the above-mentioned thin slab transverse feeding solution, since the thin slab is always transferred in the tunnel furnace and can directly enter the finishing unit 3 in the next step, the temperature loss of the thin slab is small, which is beneficial to the subsequent finishing production.

[0038] Among them, a group of transverse tracks can be arranged for the transverse movement of the transverse section unit 23 and the transverse section tunnel furnace 13. The guide stroke of the transverse track can meet the transverse movement requirements of the transverse section unit 23 and the transverse section tunnel furnace 13, that is, the transverse track of the transverse section tunnel furnace 13 is connected in series with the transverse track of the transverse section unit 23.

[0039] Preferably, the transverse section unit 23 is a transverse section heat preservation roller; in another embodiment, the transverse section unit 23 may also be a transverse tunnel furnace. Compared with the transverse tunnel furnace, the transverse section heat preservation roller can effectively avoid the high-speed slab repeatedly impacting the tunnel furnace during the reversible rolling of the roughing mill, thereby causing damage to the furnace roller, damage to the furnace shell, and steel accumulation. The transverse section heat preservation roller can better withstand such impact.

[0040] In one embodiment, the rough rolling unit 22 includes a rough rolling mechanism 221 and a pre-rough rolling heat preservation roller 222 and a post-rough rolling heat preservation roller 223 respectively arranged upstream and downstream of the rough rolling mechanism 221, wherein the pre-rough rolling heat preservation roller 222 is connected to the slab heating furnace 21, and the post-rough rolling heat preservation roller 223 is connected to the traverse section unit 23. The post-rough rolling heat preservation roller 223 can better withstand repeated impacts during reversible rolling of the rough rolling mill.

[0041] In one of the embodiments, a hot coil box is arranged at the inlet side of the finishing unit 3, which can play the role of equalizing and heat-insulating the rough rolling intermediate billet or thin slab, better coordinating the upstream and downstream production pace, etc., and can improve the production stability and smoothness of the production line.

[0042] 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 thin slab and conventional slab hot rolling combined mill, characterized in that: Including thin slab production line and conventional slab production line, The thin slab production line comprises a thin slab continuous casting machine, a fixed section tunnel furnace and a transverse section tunnel furnace which are arranged in sequence on the same line; The conventional slab production line comprises a rough rolling unit, a traverse section unit and a finishing rolling unit which are arranged in sequence on the same line; Wherein, the transverse moving section unit is suitable for transversely moving to a side away from the thin slab production line, and the transverse moving section tunnel furnace is suitable for transversely moving between the thin slab production line and the conventional slab production line; A slab heating furnace is connected upstream of the rough rolling unit.

2. The thin slab and conventional slab hot rolling combined mill according to claim 1, characterized in that: The transverse section unit is a transverse section insulation roller.

3. The thin slab and conventional slab hot rolling combined mill according to claim 1 or 2, characterized in that: The rough rolling unit adopts a reversible rolling mill.

4. The thin slab and conventional slab hot rolling combined mill according to claim 1, characterized in that: The transverse track of the transverse section tunnel furnace is colinearly connected with the transverse track of the transverse section unit.

5. The thin slab and conventional slab hot rolling combined mill according to claim 1, characterized in that: The rough rolling unit includes a rough rolling mechanism and a pre-rough rolling insulation roller and a post-rough rolling insulation roller respectively arranged upstream and downstream of the rough rolling mechanism. The pre-rough rolling insulation roller is connected to the slab heating furnace, and the post-rough rolling insulation roller is connected to the transverse section unit.

6. The thin slab and conventional slab hot rolling combined mill according to claim 5, characterized in that: The rough rolling mechanism comprises two rough rolling mills, and the two rough rolling mills are arranged in series.

7. The thin slab and conventional slab hot rolling combined mill according to claim 5, characterized in that: The rough rolling mechanism comprises two rough rolling mills, which are arranged at an interval and an intermediate heat-insulating roller table is arranged between the two rough rolling mills.

8. The thin slab and conventional slab hot rolling combined mill according to claim 1, characterized in that: The outlet rollers of the slab heating furnace are arranged in a co-linear manner upstream of the rough rolling unit.

9. The thin slab and conventional slab hot rolling combined mill according to claim 1, characterized in that: A width sizing machine is arranged between the rough rolling unit and the slab heating furnace.

10. The thin slab and conventional slab hot rolling combined mill according to claim 1, characterized in that: The slab heating furnace is a walking beam heating furnace.

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