CN102974624B - Edge plane shape control method of large-expansion-ratio high strength grade pipeline steel - Google Patents

Edge plane shape control method of large-expansion-ratio high strength grade pipeline steel Download PDF

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Publication number
CN102974624B
CN102974624B CN201210517301.2A CN201210517301A CN102974624B CN 102974624 B CN102974624 B CN 102974624B CN 201210517301 A CN201210517301 A CN 201210517301A CN 102974624 B CN102974624 B CN 102974624B
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rolling
steel plate
steel
roughing
broadening
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CN102974624A (en
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郭伟
董占斌
张跃飞
邱志宏
王传财
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Shougang Group Co Ltd
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Shougang Corp
Qinhuangdao Shouqin Metal Materials Co Ltd
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Abstract

The invention discloses an edge plane shape control method of large-expansion-ratio high strength grade pipeline steel, belonging to the technical field of a heavy and medium plate rolling technology. Proper technical parameters are controlled in a three-stage process for rough rolling of a heavy and medium plate mill. Variable cross-section thickness rolling is performed at a forming pass of the first stage of the rough milling, so that a digging effect is formed at a middle position in the length direction after the steel plate is rolled, the middle position of the steel plate is thinner than the head and the tail of the steel plate, and the thickness difference is delta h. Next, a plate blank is revolved at an angle of 90 degrees and then is expanded, and the length of the steel plate is changed into the actual rolling width at the time; and since the thickness in the width direction is different, the reduction rate from the plate edge to the plate center is also different, thereby improving the edge plane shape. The yield is improved, and the production cost is reduced.

Description

The edge plan view control method of the high-strength level pipeline pipeline steel of large broadening ratio
Technical field
The invention belongs to Medium and Heavy Plate Rolling technical field, in particular, provide the edge plan view control method of the high-strength level pipeline pipeline steel of a kind of large broadening ratio.
Background technology
In Heavy Plate Production, the flat shape after steel plate rolls is how not rectangular, must carry out crop end and trimming process, directly caused the loss of lumber recovery before delivery.At present, steel plain shape control method many employings MAS rolling, dogbone rolling method (DBR method) etc. of domestic and international heavy and medium plate mill, its essence is all the rolling with varying section by pony-roughing pass, realizes the squaring of finished steel plate.But for the high-strength level pipeline pipeline steel of large broadening ratio, the plan view control effect of its edge is unsatisfactory, and after steel plate rolling, head and tail width is narrower than middle part width, and namely edge " jujube core " shape is serious, directly cause the reduction of this specification kind lumber recovery, production cost increases.
Summary of the invention
The object of the present invention is to provide the edge plan view control method of the high-strength level pipeline pipeline steel of a kind of large broadening ratio, improve lumber recovery, reduce production cost.
The present invention at the three phases (i.e. shaping, broadening and axial rolling) of heavy and medium plate mill roughing, technique in control following technical parameter:
First, in roughing first stage shaping passage, carry out the rolling of variable cross-section thickness, form " digging pit " effect in the centre position of length direction after making steel plate rolling, steel plate centre position is thinner than steel plate thickness end to end, and thickness difference is that Δ h(" digs pit " degree of depth).Slab is turned round 90 ° afterwards and carry out broadening, now steel plate length becomes the width of actual rolling, due to wide different to thickness, also different to the reduction ratio at plate center from edges of boards, thus edge flat shape is improved.
" digging pit " degree of depth of steel plate forming passage sets in milling train second-level model, and milling train one-level executing agency is according to secondary setting value afterwards, by HGC hydraulic cylinder dynamic adjustments roll gap, finally makes steel plate reach the thickness difference of regulation along its length.
It is high-strength level pipeline pipeline steel that the present invention is suitable for steel grade, comprises X65, X70, X80 kind, and suitable thicknesses is (15-25) mm.
Roughing mill maximum rolling force 8500 tons, rolling torsion 3200KNm, the diameter × stroke of maximum reduction 40mm, HGC hydraulic roll gap control piston is φ 1500/1350 × 80mm, the maximum 29MPa of hydraulic pressure.In above capacity of equipment and optimum configurations conditioned basic, roughing important technological parameters is as follows:
The shaping reduction in pass of roughing is set as (14-26) mm, in variable cross-section THICKNESS CONTROL process, the depth delta h that " digs pit " sets according to broadening ratio size: as broadening ratio 1.5≤A < 2.2, need increase " digging pit " depth delta h of steel plate middle part, " digging pit " depth delta h is set to (4.1-6.1) mm; As broadening ratio 1.3 < A < 1.5, " digging pit " depth delta h is set to (3.0-4.0) mm.
Simultaneously, shaping passes speed must meet the adjustment requirement to roll gap in Varying-thickness control procedure of HGC hydraulic cylinder, and adopt and sting at a slow speed steel, rolling strategy, concrete controling parameters is set as: biting speed (1.0-1.2) m/s, mill speed (1.2-1.5) m/s, acceleration 0.5m/s 2.
Roughing broadening rolling (3-6) passage, draught per pass (15-30) mm.
By above measure, " digging pit " shape of shaping passage is symmetric, finally realizes steel plate edge shape and well control, thus control shear amount, improve lumber recovery.
Accompanying drawing explanation
The shaping passage of Fig. 1 roughing " is digged pit " figure.
Fig. 2 " digs pit " depth delta h3mm.
Fig. 3 " digs pit " depth delta h5mm.
Fig. 4 " digs pit " depth delta h8mm.
Fig. 2 ~ Fig. 4 is " digging pit " depth delta h effect of optimization comparison diagram.
Detailed description of the invention
Embodiment 1,17.5mmX80-1 pipe line steel
Billet bloom size: 302*1990*2985mm
Contract size: 17.5*3827*11800 mm
Broadening ratio: 1.92
Conclusion: to 17.5mmX80-1 pipe line steel, broadening ratio 1.92,25mm established by shaping reduction in pass.The shaping passage of the conventional model depth delta h that " digs pit " is 2.6mm, is 48.7mm through measuring in the middle part of steel plate with head and tail width difference; The shaping passage of the inventive method depth delta h that " digs pit " adopts 6mm, width differential 22.8mm, more conventionally arranges minimizing 53.2%.
Embodiment 2,19.2mm X70-W pipe line steel
Billet bloom size: 248*1802*2920mm
Contract size: 19.2*2552*12000 mm
Broadening ratio: 1.42
Conclusion: to 19.2mmX70-W pipe line steel, broadening ratio 1.42,20mm established by shaping reduction in pass.The shaping passage of the conventional model depth delta h that " digs pit " is 2.2mm, through measure in the middle part of steel plate with head and tail width difference 21.7mm; The shaping passage of the inventive method depth delta h that " digs pit " adopts 3.5mm, steel plate edge " jujube core " 4.6mm, more conventionally arranges minimizing 77.4%.
Embodiment 3,22mmX80-1 pipe line steel
Billet bloom size: 301*2375*3145mm
Contract size: 22*3812*12100 mm
Broadening ratio: 1.61
Conclusion: to 22mmX80-1 pipe line steel, broadening ratio 1.61,15mm established by shaping reduction in pass.The shaping passage of the conventional model depth delta h that " digs pit " is 3mm, through measure in the middle part of steel plate with head and tail width difference 25.6mm; The shaping passage of the inventive method depth delta h that " digs pit " adopts 5mm, steel plate edge " jujube core "-0.25mm, more conventionally arranges minimizing 99.0%, improves successful.

Claims (1)

1. an edge plan view control method for the high-strength level pipeline pipeline steel of large broadening ratio, is characterized in that, controls following technical parameter in shaping, the broadening of heavy and medium plate mill roughing and the technique of axial rolling three phases:
In roughing first stage shaping passage, carry out the rolling of variable cross-section thickness, form " digging pit " effect in the centre position of length direction after making steel plate rolling, steel plate centre position is thinner than steel plate thickness end to end, and thickness difference is Δ h, the degree of depth of namely " digging pit "; Slab is turned round 90 ° afterwards and carry out broadening, now steel plate length becomes the width of actual rolling;
" digging pit " degree of depth of steel plate forming passage sets in milling train second-level model, and milling train one-level executing agency is according to secondary setting value afterwards, by HGC hydraulic cylinder dynamic adjustments roll gap, finally makes steel plate reach the thickness difference of regulation along its length;
Roughing mill maximum rolling force 8500 tons, rolling torsion 3200KNm, the diameter × stroke of maximum reduction 40mm, HGC hydraulic roll gap control piston is φ 1500/1350 × 80mm, the maximum 29MPa of hydraulic pressure; In above capacity of equipment and optimum configurations conditioned basic, roughing technical parameter is as follows:
The shaping reduction in pass of roughing is set as 14-26mm, in variable cross-section THICKNESS CONTROL process, the depth delta h that " digs pit " sets according to broadening ratio size: as broadening ratio 1.5≤A < 2.2, need increase " digging pit " depth delta h of steel plate middle part, " digging pit " depth delta h is set to 4.1-6.1mm; As broadening ratio 1.3 < A < 1.5, " digging pit " depth delta h is set to 3.0-4.0mm;
Shaping passes speed meets the adjustment requirement to roll gap in Varying-thickness control procedure of HGC hydraulic cylinder, and adopt and sting at a slow speed steel, rolling strategy, concrete controling parameters is set as: biting speed 1.0-1.2m/s, mill speed 1.2-1.5m/s, acceleration 0.5m/s 2;
Roughing broadening rolling 3-6 passage, draught per pass 15-30mm;
Applicable steel grade is high-strength level pipeline pipeline steel, and described high-strength level pipeline pipeline steel is X65, X70, X80 kind, and suitable thicknesses is 15-25mm.
CN201210517301.2A 2012-12-06 2012-12-06 Edge plane shape control method of large-expansion-ratio high strength grade pipeline steel Active CN102974624B (en)

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CN103386419B (en) * 2013-07-15 2015-08-26 莱芜钢铁集团有限公司 The control method of large broadening ratio steel plate head and tail width
CN103480648A (en) * 2013-09-18 2014-01-01 济钢集团有限公司 Novel PVPC (plan view pattern control) rolling process for surface plates
CN104747891B (en) * 2013-12-30 2017-05-03 福建三钢闽光股份有限公司 Intermediate blank rolled piece shape control method after last-pass broadening during medium plate production
CN103817155B (en) * 2014-02-21 2016-01-13 内蒙古包钢钢联股份有限公司 Thickness is greater than 50mm steel plate board-shape control method
CN106475412A (en) * 2015-08-26 2017-03-08 宝山钢铁股份有限公司 A kind of milling method of cut deal
CN106311757B (en) * 2016-10-08 2018-03-09 南京钢铁股份有限公司 A kind of method for reducing Wide and Thick Slab and cutting damage
CN111389916A (en) * 2020-03-26 2020-07-10 太原科技大学 Gradient tissue regulation and control method based on cross variable thickness rolling

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Address after: 066326 Du Zhuang Township, Funing County, Qinhuangdao, Hebei

Co-patentee after: Shougang Group Co. Ltd.

Patentee after: Qinhuangdao Shouqin Metal Material Co., Ltd.

Address before: 066326 Du Zhuang Township, Funing County, Qinhuangdao, Hebei

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