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Rolling process of limit-specification steel plate of 2800mm double-stand heavy and medium plate mill

A technology with extreme specifications and double racks, applied in metal rolling, manufacturing tools, metal rolling, etc., can solve problems such as no advantages, achieve the effects of optimizing steel burning process, widening the range of specifications, and improving temperature uniformity

Active Publication Date: 2014-04-30
NANJING IRON & STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] With the continuous construction and commissioning of new wide and heavy plate rolling mills, the original 2800mm double-stand medium and heavy plate rolling mills in the medium plate factory have no advantages in terms of equipment.

Method used

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  • Rolling process of limit-specification steel plate of 2800mm double-stand heavy and medium plate mill
  • Rolling process of limit-specification steel plate of 2800mm double-stand heavy and medium plate mill
  • Rolling process of limit-specification steel plate of 2800mm double-stand heavy and medium plate mill

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] A 2800mm double-stand medium and heavy plate rolling mill extreme thick plate rolling process, the rolling process requires a tapping temperature of 1200°C, a reduction of each rough rolling pass of less than 31mm, a rough rolling finish rolling temperature of above 1030°C, and a rough rolling finish temperature of 1030°C. The rolling speed is between 1.48~1.5m / s, the reduction of each pass in the finishing rolling stage is less than 12mm, the finishing rolling temperature is not lower than 880°C, and the rolling speed in the finishing rolling stage is between 2.08~2.35m / s, the temperature of turning red is 810~850℃.

[0025] In this example, one piece of P20 die steel plate is selected, the actual size of the billet is 320mm*2070mm*2305mm, the rolling thickness is 123.81mm (positive tolerance rolling), and a total of 10 passes are rolled, of which 6 passes are rough rolled, and the passes are pressed The weights are 24.24mm, 29.88mm, 29.09mm, 30.91mm, 28mm, 21.48mm, 4...

Embodiment 2

[0034] A 2800mm double-stand medium and heavy plate rolling mill limit thin plate rolling process, the rolling process requires a tapping temperature of 1200~1220°C, the reduction of each pass of rough rolling is less than 26mm, and the finishing temperature of rough rolling is above 1060°C. The rolling speed of rough rolling is between 1.4~3m / s, the reduction of each pass in the finishing rolling stage is less than 8mm, the finishing rolling temperature is not lower than 840℃, and the rolling speed in the finishing rolling stage is between 3.72~4m / s s.

[0035] In this example, one piece of Q345B steel plate is selected, the actual size of the billet is 180mm*2060mm*1232mm, the rolling thickness is 5.82mm (negative tolerance rolling), and a total of 12 passes are rolled, including 7 passes for rough rolling, and the reduction in passes Respectively 24.83mm, 23.79mm, 25.26mm, 24.07mm, 25.39mm, 20.34mm, 12.03mm, finish rolling 5 passes, pass reductions are 7.27mm, 5.18mm, 3.16...

Embodiment 3

[0044] A 2800mm double-stand medium and heavy plate mill extreme wide plate rolling process, the rolling process requires a tapping temperature of 1180~1220°C, a reduction of each rough rolling pass of less than 23mm, and a finishing temperature of rough rolling above 1040°C , the rough rolling speed is between 1.5~1.55m / s, the reduction of each pass in the finishing rolling stage is less than 10mm, the finishing rolling temperature is not lower than 840℃, and the rolling speed in the finishing rolling stage is between 2.5~ 3.38m / s.

[0045] In this embodiment, one piece of Q390GJCZ25 steel plate is selected, the actual size of the billet is 260mm*2570mm*2982mm, the rolling thickness is 60.95mm, and there are 13 rolling passes in total, including 7 rough rolling passes, and the reductions of the passes are 22.81mm and 21.3mm respectively. mm, 21.76mm, 21.64mm, 21.69mm, 21.57mm, 21.73mm, 6 passes of finish rolling, the pass reductions are 9.97mm, 9.05mm, 9.01mm, 7.97mm, 7.28mm,...

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Abstract

The invention discloses a rolling process of a limit-specification steel plate of a 2800mm double-stand heavy and medium plate mill, realizing the production of a 1200mm limit thick plate, a 6mm limit thin plate, a 2585mm limit wide plate and a 1585mm limit narrow plate. The limit-specification steel plate with good shape and qualified performance is obtained by controlling the temperature of a heating furnace in different phases, the soaking time, the furnace-on time, the tapping temperature, the high-pressure water descaling system, the pass reduction of the roughing roll, the finishing temperature of the roughing roll, the rolling cycle, the pass reduction in the finish rolling phase, the finishing temperature of the finish rolling and the re-reddening temperature. The invention broadens the specification range of the steel plate of the 2800mm double-stand heavy and medium plate mill, ensures normal operation of the rolling mill, meets the performance and shape requirement of the limit-specification steel plate, improves the rolling rate at one time, enhances the output of the limit-specification steel plate and has high economic benefits.

Description

technical field [0001] The invention belongs to the field of steel rolling, and relates to a rolling process, in particular to a rolling process of a steel plate with a limit specification of a 2800mm double-stand medium-thick plate rolling mill under the condition of ensuring equipment safety. Background technique [0002] With the continuous construction and commissioning of new wide and heavy plate rolling mills, the original 2800mm double-stand medium and heavy plate rolling mills in the medium plate factory have no advantages in terms of equipment. At the same time, it also faces competition from similar companies. Therefore, fully exploiting the production capacity of the rolling mill under the premise of normal operation of the rolling mill is the road to sustainable development of the enterprise. Due to the limitation of the maximum opening of the rolling mill, the length of the work roll body, rolling force and rolling moment, the specifications of the products pro...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B21B1/38B21B37/74B21B37/46B21B45/08
Inventor 郑东升朱金宝侯中华廖仕军杨果煜
Owner NANJING IRON & STEEL CO LTD
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