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Control method for limit specification steel roll hot rolling by single-stand steekle mill

A technology of the steel-steel rolling mill and the limit specification, which is applied in the field of steel rolling, and can solve the problems of increasing the difficulty of controlling the performance of the rolled piece, excessive temperature drop, performance and shape, etc.

Active Publication Date: 2012-10-03
NANJING IRON & STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Since the steel coil product is longer in the rolling process, as the steel plate becomes thinner and thinner in the rolling process, the rolled piece will become longer and longer, the rolling cycle will be longer, and the corresponding temperature drop of the steel plate will be greater. In particular, the temperature drop at the head and tail of the rolled piece will be faster, and the temperature distribution in the length direction of the rolled piece will be extremely uneven, which increases the difficulty of controlling the performance of the rolled piece
For this reason, it is an urgent problem to develop a performance control process for long billet steckel rolling mills with the production limit specifications and strength level of 360MPa steel coils, especially when the billet length is more than 10m, the temperature difference of the rolled piece will be too large and the A series of problems such as performance and plate shape caused by excessive temperature drop

Method used

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  • Control method for limit specification steel roll hot rolling by single-stand steekle mill
  • Control method for limit specification steel roll hot rolling by single-stand steekle mill

Examples

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Embodiment 1

[0024] This embodiment is a control process for the performance of rolling 12.7mm*2500mm pipeline steel L415 steel coils in a single-stand furnace coil mill. °C, the tail heating temperature is 1225 °C. The rolling pass is 4+5, the second-stage rolling temperature is 960°C, the billet thickness is 4h, the final rolling temperature is 810°C, and the reddening temperature is 560°C. The reduction rate of the 8th pass is 12%, and the reduction rate of the 9th pass is 8%; the bending force coefficient is 2.5, and the final rolling speed is 2.9m / s;

[0025] In this example, one piece of flat-rolled plate X65 pipeline steel coil is selected. The actual size of the billet is 150*2500*7100mm, the thickness of the finished product is 12.7mm, and the rolling is 11 passes, which is divided into two rolling stages: one-stage flat rolling 4 passes, 5 passes in the second stage flat rolling. The specific process is as follows, see figure 1 :

[0026] ⑴Main chemical composition design: C:...

Embodiment 2

[0033] This embodiment is a single-stand furnace coil mill hot-rolled S355 steel coil with the limit thickness and the thinnest width of 5mm*2500mm. 1200°C, the tail heating temperature is 1225°C. There are 13 rolling passes, uncontrolled rolling, the final rolling temperature is 830°C, and the reddening temperature is 650°C. The reduction rate of the 12th pass is 13%, and the reduction rate of the 13th pass is 9%; the bending force coefficient is 2.0, and the final rolling speed is 3.87m / s;

[0034] In this embodiment, one piece of rolled S355 export steel coil is selected. The actual size of the billet is 150*2500*6800mm, the thickness of the steel coil is 5mm*2500mm, and the rolling is performed in 13 passes without controlled rolling. The specific process is as follows, see figure 1 :

[0035] ⑴Main chemical composition design: C: 0.16%, Mn: 1.45%, Si: 0.25%, Nb: 0.025%, Ceq=0.42, the balance is iron; process point and mechanical property prediction: yield strength=426M...

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Abstract

The invention belongs to the field of steel rolling and relates to a control method for limit specification steel roll hot rolling by a single-stand steekle mill. Through the measures of optimizing the chemical ingredient design, developing he layer flow cooling system head and tail avoiding function, optimizing the rolling control processes matched with the chemical ingredients and the like, the performance qualification stability of limit specification steel rolls at the level with the yield strength being higher than or equal to 360 MPa rolled by the single-stand steekle mill is integrally ensured. The control method provided by the invention has the advantages that the performance qualification stability of limit specification steel rolls at the level with the yield strength being higher than or equal to 360 MPa rolled by the single-stand steekle mill can be integrally ensured, the steekle mill rolled steel rolls with the limit thinnest and widest specification being 5mm*2500mm can be produced, and the steekle mill flat rolled steel rolls with the limit thickest and widest specification being 25mm*2500mm can also be produced.

Description

technical field [0001] The invention belongs to the field of steel rolling, and relates to a method for controlling the properties of steel coils, in particular to a method for controlling the hot-rolled limit specification steel coils of a single-stand furnace coil mill. Background technique [0002] At present, 150mm~220mm thick billets are being used to roll and produce steel coils with a limit thickness and width (thinnest 5mm*2500mm, thickest 25) of 360MPa. The product specifications have reached the limit value of medium and heavy plate production. [0003] Since the steel coil product is longer in the rolling process, as the steel plate becomes thinner and thinner in the rolling process, the rolled piece will become longer and longer, the rolling cycle will be longer, and the corresponding temperature drop of the steel plate will be greater. In particular, the temperature drop at the head and tail of the rolled piece will be faster, and the temperature distribution in...

Claims

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Application Information

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IPC IPC(8): B21B1/22B21B37/74B21B37/58C21D8/02C22C38/38C22C38/26C22C38/24C22C38/18C22C38/04
Inventor 赵显鹏王道远刘春梁江民吴俊平王凡
Owner NANJING IRON & STEEL CO LTD
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