Method for improving rolling stability of container thin material

A container and stability technology, applied in the direction of metal rolling, metal rolling, manufacturing tools, etc., can solve the problems of affecting the surface quality of strip steel, increasing the rate of scrap and accident, affecting the qualified rate and performance rate of container thin materials, etc. Achieve the effect of reducing accident rate and accident handling workload, improving rolling mill operation rate and rolling efficiency, and improving corporate reputation and economic benefits

Active Publication Date: 2010-12-29
ANGANG STEEL CO LTD
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AI Technical Summary

Problems solved by technology

[0002] Since the thickness of the thin-gauge steel strip for making containers is relatively thin, only 1.2 to 2.0mm, it is almost close to the limit specification of hot-rolled thin-strip steel plates, and the steel type used for rolling container thin-strips is SPA-H. The resistance to plastic deformation is large during the process, so rolling instability is prone to occur during the finishing rolling production process
Due to the factors of unstable rolling, during the finishing rolling process, the strip steel is prone to accidents such as head-folding or tail-flicking accidents at the rear, and damages such as scratch marks and waxing on the rolls, which seriously affect the subsequent strips. steel surface quality
At the same time, unstable rolling also causes problems such as strip deviation and abnormal fluctuation of the looper during the rolling process of the strip, which brings great difficulty to the adjustment of the finishing rolling operation, and even steel jamming accidents, especially in the finishing It is very difficult to control the strip shape during the rolling process, which reduces the rolling production efficiency and increases the scrap and accident rate
According to statistics, the rolling success rate of container thin material is only about 70%.
Once the rolls are stamped and waxed due to the head-folding or tail-flicking accidents of the strip, the rolls must be changed; when the steel jamming accident occurs, the waste products still need to be processed while the rolls are being changed. These defects and accidents are not only It seriously affects the surface quality and normal delivery of strip steel products, and affects the operating rate of the rolling mill and the smooth progress of production, causing great economic losses
In addition, after the roll change, the rolling line needs to modify the finished thickness specifications of a certain number of strips, and make a transition to continue rolling thin gauges. The steel strips with changed specifications cannot be delivered as required and the contract can be fulfilled, which in turn affects the pass rate of container thin strips. and performance rate, which will have a negative impact on corporate reputation

Method used

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Examples

Experimental program
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Effect test

Embodiment 1

[0022] The size of the billet is 230×1200mm, the material is SPA-H, and the specification of the rolled container thin material is 2.0×1100mm. Three heating furnaces are used, and seven finishing mills are used. F6 and F7 indicate that F1-F4 are PC rolling mills.

[0023] In order to ensure that the container thin material is rolled in the best condition of the finishing roll, the container thin material is arranged to be rolled in the middle of the rolling plan, and before the container thin material is rolled, 4 transitional materials are arranged to be intensively rolled. The transition material is 45# high-quality carbon structural steel, and the specifications of the finished products after rolling are two pieces of 2.3×1150mm and two pieces of 2.5×1120mm.

[0024] Heating regime control:

[0025] Considering that the casting slab is thicker and the furnace charging temperature reaches 630°C, it is put into a heating furnace with other hot slabs; the total heating time o...

Embodiment 2

[0036] The size of the billet is 170×1150mm, the material is SPA-H, and the specification of the container thin material after rolling is 1.5×1100mm. Three heating furnaces and seven finishing mills are used. F1~F4 are PC rolling mills.

[0037] The transition material is A420LF automobile beam steel, and the finished product specification after rolling is 2.0×1150mm. Before rolling the container thin material, arrange to roll 4 pieces of transition material intensively.

[0038] Heating control: the billet is cold at room temperature; the total heating time in the heating furnace is 220 minutes, the soaking time is 70 minutes, and the temperature of the billet out of the furnace is controlled at 1250°C;

[0039] The slabs near the furnace doors of the three heating furnaces arrive at the tapping position after an interval of 95 seconds.

[0040] Rough rolling control: rough rolling adopts large reduction rolling to reduce descaling cooling water flow, and the rough rolling o...

Embodiment 3

[0046] The specification of casting slab is 200×1000mm, the material is SPA-H, the specification of container thin material is 1.2×900mm, three heating furnaces are used, seven finishing mills are used, and F1~F4 are PC rolling mills.

[0047] 09CuPCrNi-A corrosion-resistant steel is selected as the transition material, and 4 pieces of transition material are rolled intensively first, and the finished product specifications are two pieces of 1.6×950mm and two pieces of 1.4×930mm.

[0048] Heating system: billet charging temperature reaches 500°C, total heating time is 195 minutes, soaking time is 55 minutes, billet exit temperature is controlled at 1250°C; billets near the furnace door reach the tapping position after 97 seconds.

[0049] Rough rolling: Rolling with a large reduction to reduce the number of descaling, and the temperature at the exit of rough rolling is controlled at 1120°C.

[0050] Finish rolling: F1 adopts single-exhaust scale water descaling, all cooling wate...

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Abstract

The invention relates to a method for improving the rolling stability of a container thin material. By reasonably configuring a rolling plan, optimizing process technical parameters, improving a process schedule, taking temperature control as a principle line and adopting a series of effective technical measures such as strictly controlling a heating mechanism, a rough rolling production process, a finish rolling production process and the like, the rolling stability of the container thin material is improved; head folding, whipping and strip blocking accidents of stripped steel are reduced; punch mark and scratch phenomena of a roller, stripped steel deviation and loop fluctuation in a rolling process are avoided; and the strip shape and the surface quality of the container thin material are improved so that the rolling success ratio is up to 99 percent. Simultaneously, accident processing workload is reduced, rolling mill operating rate and product yield are improved, contract implementation rate is ensured and enterprise goodwill and economic benefit are improved.

Description

technical field [0001] The invention belongs to the field of steel rolling technology, and in particular relates to a method for improving the stability of finish rolling of container thin-gauge steel strips and improving the pass rate of finished product quality. Background technique [0002] Since the thickness of the thin-gauge steel strip for making containers is relatively thin, only 1.2 to 2.0mm, it is almost close to the limit specification of hot-rolled thin-strip steel plates, and the steel type used for rolling container thin-strips is SPA-H. The resistance to plastic deformation in the process is large, so rolling instability is prone to occur in the finishing rolling production process. Due to the factors of unstable rolling, during the finishing rolling process, the strip steel is prone to accidents such as head-folding or tail-flicking accidents at the rear, and damages such as scratch marks and waxing on the rolls, which seriously affect the subsequent strips....

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B21B37/00B21B37/74B21B37/28B21B37/48C21D9/70C21D11/00
Inventor 高磊谷春阳阎东宇刘威李向科康小兵
Owner ANGANG STEEL CO LTD
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