Method for rolling wide thin plates of wide and thick plate rolling machine

A plate rolling mill and thin plate technology, applied in rolling mill control devices, metal rolling, metal rolling, etc., can solve problems such as plate shape and performance instability, and achieve the effects of high pass rate, uniform performance, and optimized rolling procedures

Active Publication Date: 2019-03-26
HUNAN VALIN XIANGTAN IRON & STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to provide a method for rolling wide and thin plates by a wide and thick plate rolling mill, which solves the problem of unstable plate shape and performance in the production process of the existing wide and thin specification steel plates, and realizes the ability of the wide and thick plate rolling mill to mass produce wide and thin plates

Method used

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  • Method for rolling wide thin plates of wide and thick plate rolling machine
  • Method for rolling wide thin plates of wide and thick plate rolling machine

Examples

Experimental program
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Effect test

Embodiment 1

[0019] The rolling raw material is continuous casting slab with a section of 260mm×2270mm, and the steel type is CCS E; the target thickness of the rolled steel plate is 6mm, and the actual average thickness is 6.1mm; the target width of the steel plate is 3160mm; the length of the rolled mother plate is about 38280mm, cut 3 sub-plates, the length of the sub-plates is 12000mm; the key rolling process of the steel plate:

[0020] (a) Roll the continuous casting slab to a billet with a thickness of 140mm, and carry out widening and rolling during the billeting process. After widening, the width of the billet is about 3280mm, so that the trimming amount of the finished steel plate is about 120mm; and used during the widening process In the PVPC mode, set the proportion of the length of the PVPC inner zone to 20%, the proportion of the length of the PVPC outer zone to 80%, and the PVPC cumulative depth of the widening pass to be 4mm;

[0021] (b) Adopt a walking beam heating furna...

Embodiment 2

[0031] The raw material for rolling is a continuous casting slab with a section of 180mm×2070mm, and the steel type is Q370qE; the target thickness of the rolled steel plate is 6mm, and the actual average thickness is 5.8mm; the target width of the steel plate is 2610mm; the length of the rolled mother plate is about 32100mm, cut into 2 sub-plates, the length of the sub-plates is 14900mm; the key rolling process of the steel plate:

[0032] (a) Roll the continuous casting slab to a billet with a thickness of 100mm, and carry out widening and rolling during the billeting process. After widening, the width of the billet is about 2700mm, so that the trimming amount of the finished steel plate is about 90mm; and used during the widening process In the PVPC mode, set the proportion of the length of the PVPC inner zone to 15%, the proportion of the length of the PVPC outer zone to 90%, and the PVPC cumulative depth of the widening pass to be 3mm;

[0033] (b) A walking beam heating ...

Embodiment 3

[0043] The rolling raw material is continuous casting slab with a section of 220mm×2270mm, and the steel type is Q460GJE; the target thickness of the rolled steel plate is 6mm, and the actual average thickness is 6.3mm; the target width of the steel plate is 3380mm; the length of the rolled mother plate is about 33100mm, cut into 3 sub-plates, the length of the sub-plates is 10200mm; the key rolling process of the steel plate:

[0044] (a) Roll the continuous casting slab to a billet with a thickness of 120mm, and carry out widening and rolling during the billeting process. After widening, the width of the billet is about 3480mm, so that the trimming amount of the finished steel plate is about 100mm; and used during the widening process In the PVPC mode, set the proportion of the length of the PVPC inner zone to 25%, the proportion of the length of the PVPC outer zone to 75%, and the PVPC cumulative depth of the widening pass to be 5mm;

[0045] (b) Adopt a walking beam heatin...

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Abstract

The invention provides a method for rolling wide thin plates of a wide and thick plate rolling machine. According to the method, by means of size and shape design of a blank, uniform high-temperatureheating, control over rolling roller type and roller face temperature, optimization of the rolling schedule, especially ensuring of the stability of the rolling state of the last two passes, and control over technology key points of straightening and pile cooling, the wide and thick plate rolling machine can roll wide and thin steel plates with the thickness of 6 mm and the width surpassing 2500 mm, the uneven degree of the steel plates can reach the range smaller than 3 mm/m, the thickness allowance meets the N type deviation allowed by the national standard GB/T 709-2006, the performance ofthe overall steel plate is uniform, the obdurability is good, and the steel plate can meet the manufacturing requirement of ship plates, bridges, buildings and other steel structures. The method solves the problem that in the production process of existing wide and thin steel plates, the plate shape and the performance are not stable, and the ability of the wind and thick plate rolling machine toproduce the wide and thin plates in batches can be achieved.

Description

technical field [0001] The invention belongs to the technical field of steel rolling production, in particular to a method for rolling wide and thin plates by a wide and thick plate rolling mill. Background technique [0002] As we all know, when using wide and thick plate rolling mills to roll wide and thin steel plates, especially when the thickness of the steel plate is 6mm and the width exceeds 2500mm, due to the rapid temperature drop of the steel plate during the rolling process, and the large difference in temperature drop between the longitudinal head, middle tail and transverse middle edge of the steel plate, In addition, the large proportional convexity of wide and thin plate rolling may easily lead to unstable rolling conditions, such as wave shape, scooping, and sickle bending. At the same time, it will affect the uniformity of the mechanical properties of the steel plate, which will easily lead to the middle part of the steel plate. The impact toughness is signi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B21B1/38B21B37/74B21B37/16
CPCB21B1/38B21B37/16B21B37/74B21B2001/386B21B2261/06B21B2267/12B21B2267/18
Inventor 彭宁琦赵军罗登姚建华刘海浪
Owner HUNAN VALIN XIANGTAN IRON & STEEL CO LTD
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