CN102397875B - Production method of longitudinal thickness-variable steel plate - Google Patents

Production method of longitudinal thickness-variable steel plate Download PDF

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Publication number
CN102397875B
CN102397875B CN201010282876.1A CN201010282876A CN102397875B CN 102397875 B CN102397875 B CN 102397875B CN 201010282876 A CN201010282876 A CN 201010282876A CN 102397875 B CN102397875 B CN 102397875B
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China
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steel plate
thickness
temperature
rolling
production
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CN201010282876.1A
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Chinese (zh)
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CN102397875A (en
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王明林
乔馨
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鞍钢股份有限公司
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Abstract

The invention provides a production method of a longitudinal thickness-variable steel plate. Plate shapes, surface quality and mechanical property of the steel plate are controlled and improved through a series of process technical measures of controlling the difference of temperatures on the upper surface and the lower surface of a steel blank during discharging and a high-pressure water descaling pass, controlling difference of diameters of an upper working roller and a lower working roller during roller distribution, regulating a zero point self-adaption numerical number of a mathematical model according to an actual thickness of the steel plate, and controlling the rolling speed, the rolling starting speed and the rolling ending speed of the steel plate, two last two passes of single-pass deformations, the cooling speed after rolling, the cooling starting temperature and the cooling ending temperature of the steel plate, thus, the qualified longitudinal thickness-variable steel plate is produced. The qualified longitudinal thickness-variable steel plate produced according to the production process and the technical parameters has a plate shape yield of reaching above 95 percent and a performance yield of reaching 99 percent, no adhered oxide skin on the surface, and various physical and chemical performance indexes completely according with the standard requirement.

Description

A kind of production method of longitudinal thickness-variable steel plate
Technical field
The invention belongs to the steel rolling process technical field, be specifically related to a kind of length direction not uniform thickness be the production method of longitudinal variable-thickness hot rolling Wide and Heavy Plates.
Background technology
The vertical thickness deformation process of thickening steel plate, be at first by steel plate respectively reserve end to end certain surplus, calculate rolled piece precomputation plasticity curve according to rolling force model, then determine the roll gap of roll in conjunction with the mill spring curve, then under this roll gap, be rolled.Calculate and shut out length in the head operation of rolling, after the rolling of head transition stage completes, carry out again the Varying-thickness rolling.According to the variation of variable thickness rolled length, corresponding adjustment roll gap, until the Varying-thickness section shuts out target length, now the thickness of rolled piece has been transitioned into maximum ga(u)ge.Carry out afterwards the afterbody rolling, the deviation based on precomputation plasticity curve and the existence of actual plasticity curve, in the afterbody operation of rolling, according to the difference of Practical Calculation exit thickness, adjust the position of roll gap, eliminates the afterbody thickness deviation, until the afterbody rolling completes.
Longitudinal thickness-variable steel plate mainly is used on the edge of a wing of I-beam, sometimes also is used to the web of I-beam and case beam.This quality plate can reduce the number of times welded in structure and alleviate the weight of structure, in industries such as shipbuilding, bridge, containers, vast potential for future development is arranged.
At present, the production of domestic longitudinal thickness-variable steel plate is also at the early-stage, and everyway is immature, and a lot of enterprises still roll the stage in the test examination, and the production Technology of variable-thickness steel plate is also in confidential state.China is one of maximum in the world iron and steel country of consumption, and iron and steel will be day by day rare as a kind of limited resource, and it is also very urgent promoting production and using high-performance steel.Therefore, the national science view of development is complied with in the research of longitudinal thickness-variable steel plate production technology, adapts to the needs that minimizing is manufactured, and to improving the core competitiveness of enterprise, is of great practical significance.And the reality of producing in conjunction with China's Wide and Thick Slab, formulate rational longitudinal thickness-variable steel plate production technology, effectively control intensity and the toughness of finished steel plate, guarantee that the property indices of longitudinal thickness-variable steel plate meets the requirement of same level steel plate relevant criterion, produce qualified longitudinal thickness-variable steel plate, thereby satisfying the market and user's instructions for use is a problem demanding prompt solution.
Summary of the invention
Purpose of the present invention aims to provide a kind of comprehensive process technical measures, thus guarantee to roll out lightweight, cost is low, weld seam is few, structure is excellent, has the method for the longitudinal thickness-variable steel plate of good profile and mechanical property.
For this reason, the technical solution that the present invention takes is:
A kind of production method of longitudinal thickness-variable steel plate, by taking to control the cooling method of heating, controlled rolling and control, control and improve plate shape, surface quality and the mechanical property of steel plate, thereby produce qualified longitudinal thickness-variable steel plate.Its concrete grammar is:
When steel billet is come out of the stove, the upper surface temperature is higher 20~40 ℃ than underlaying surface temperature.
After steel billet is come out of the stove, high-pressure water descaling 1~2 passage.
When milling train is joined roller, the top working roll diameter is greater than the bottom working roll diameter, and upper and lower work roll diameter is poor is≤6mm.
When rolling starts, adjust the self adaptation numerical value at zero point of Mathematical Modeling according to the actual (real) thickness of steel plate.What is called self adaptation numerical value at zero point, refer in the situation that measurement of the steel plate thickness can be used, by the comparison of calculated thickness and detect thickness, to carrying out the coefficient value of effectively revising the zero point of Mathematical Modeling.Concrete span is:
Steel plate thickness is 10~40mm, and zero point, self adaptation numerical value was 0.1~0.3;
Steel plate thickness is>40mm~≤ 60mm, zero point, self adaptation numerical value was 0.3~0.5;
Steel plate thickness is>60mm~≤ 80mm, zero point, self adaptation numerical value was 0.5~0.6;
Steel plate thickness>80mm, zero point, self adaptation numerical value was 0.7.
Steel plate rolling speed is controlled at 5.5~6.5m/s.
Start rolling temperature is 1000~1100 ℃, and finishing temperature is 950~1050 ℃.
The single pass heavy deformation of last twice is 10~15%.
Maximum rolling force is 80~95MN, peak torque 3500~3800kNm, maximum reduction 30~45mm, maximum depression rate 35~45%.
It is 900~1000 ℃ that setting begins to cool down temperature, and final cooling temperature is 800~900 ℃.
Cooldown rate is 2~5K/s.
The technical data of recommending is:
When steel billet is come out of the stove, the upper surface temperature is higher 30 ℃ than underlaying surface temperature.
Upper and lower work roll diameter is poor is 3mm.
The steel plate start rolling temperature is 1050 ℃, and finishing temperature is 1000 ℃.
The single pass heavy deformation of last twice is 12%.
It is 950 ℃ that setting begins to cool down temperature, and final cooling temperature is 850 ℃.
It is 3K/s that steel plate rolls rear cooldown rate.
Beneficial effect of the present invention is:
The longitudinal thickness-variable steel plate of producing according to above-mentioned production technology and technical parameter, its template qualification rate reaches more than 95%, and properties percent of pass reaches 99%, and surface is without the iron scale sticked together, and every physics, chemical property index meet standard-required fully.
The longitudinal thickness-variable steel plate that uses the inventive method to produce, for truss and bridge structure, it is light that the steel plate that not only its weight ratio is traditional is wanted; And can reduce Production Time, reduce cost of manufacture; Simultaneously, weld seam can be transferred to the zone that stress is less during welding and can reduce weld seam.In addition, for the structure that needs antifatigue, also can, according to the actual stress distribution section configuration of optimizing structure, increase the security of structure.
The specific embodiment
Below, the invention will be further described in conjunction with the embodiments.
The production method of the present invention's longitudinal thickness-variable steel plate, it is mainly the hot rolled steel plate more than 10mm for thickness, utilize longitudinal thickness-variable steel plate milling train and corresponding automatic control system, take to optimize a series of comprehensive technology measures such as heating cycle, controlled rolling technique and adjustment cooling technology, control and improve plate shape, surface quality and the mechanical property of steel plate, thereby produce qualified longitudinal thickness-variable steel plate.
Embodiment 1: steel plate thickness is 40mm.
Heating steel billet is complete while coming out of the stove from heating furnace, and its upper surface temperature is higher 30 ℃ than underlaying surface temperature.
After steel billet is come out of the stove, through high-pressure water descaling 1 passage.
When milling train is joined roller, the top working roll diameter is greater than the bottom working roll diameter, and upper and lower work roll diameter is poor is 3mm.
According to the actual (real) thickness of steel billet, the self adaptation numerical value at zero point of choosing Mathematical Modeling is 0.3.
Steel plate rolling speed is controlled at 6.0m/s.
Start rolling temperature is 1050 ℃, and finishing temperature is 1000 ℃.
The single pass heavy deformation of last twice is 12%.
Maximum rolling force is 85MN, peak torque 3800kNm, maximum reduction 40mm, maximum depression rate 45%.
It is 950 ℃ that setting begins to cool down temperature, and final cooling temperature is 850 ℃.
Cooldown rate is 3K/s.
Embodiment 2: steel plate thickness is 100mm.
When steel billet is come out of the stove, the upper surface temperature is higher 40 ℃ than underlaying surface temperature.
After steel billet is come out of the stove, high-pressure water descaling 2 passages.
When milling train is joined roller, the top working roll diameter is greater than the bottom working roll diameter, and upper and lower work roll diameter is poor is 6mm.
The self adaptation numerical value at zero point of the Mathematical Modeling of choosing according to the actual (real) thickness of steel plate is 0.7.
Steel plate rolling speed is controlled at 6.5m/s.
Start rolling temperature is 1000 ℃, and finishing temperature is 950 ℃.
The single pass heavy deformation of last twice is 14%.
Maximum rolling force is 80MN, peak torque 3600kNm, maximum reduction 45mm, maximum depression rate 40%.
It is 1000 ℃ that setting begins to cool down temperature, and final cooling temperature is 900 ℃.
Cooldown rate is 4.5K/s.
Embodiment 3: steel plate thickness is 65mm.
When steel billet is come out of the stove, the upper surface temperature is higher 20 ℃ than underlaying surface temperature.
After steel billet is come out of the stove, high-pressure water descaling 1 passage.
When milling train is joined roller, the top working roll diameter is greater than the bottom working roll diameter, and upper and lower work roll diameter is poor is 4mm.
The self adaptation numerical value at zero point of the Mathematical Modeling of choosing according to the actual (real) thickness of steel plate is 0.52;
Steel plate rolling speed is controlled at 5.5m/s.
Start rolling temperature is 1100 ℃, and finishing temperature is 1050 ℃.
The single pass heavy deformation of last twice is 10%.
Maximum rolling force is 95MN, peak torque 3650kNm, maximum reduction 30mm, maximum depression rate 37%.
It is 900 ℃ that setting begins to cool down temperature, and final cooling temperature is 800 ℃.
Cooldown rate is 2K/s.

Claims (7)

1. the production method of a longitudinal thickness-variable steel plate, is characterized in that, by taking to control the cooling method of heating, controlled rolling and control, controls and improve plate shape, surface quality and the mechanical property of steel plate; Concrete grammar is:
When steel billet is come out of the stove, the upper surface temperature is higher 20~40 ℃ than underlaying surface temperature;
After steel billet is come out of the stove, high-pressure water descaling 1~2 passage;
When milling train is joined roller, the top working roll diameter is greater than the bottom working roll diameter, and upper and lower work roll diameter is poor is≤6mm;
When rolling starts, adjust the self adaptation numerical value at zero point of Mathematical Modeling according to the actual (real) thickness of steel plate, what is called self adaptation numerical value at zero point, refer in the situation that measurement of the steel plate thickness can be used, by the comparison of calculated thickness and detect thickness, to carrying out the coefficient value of effectively revising the zero point of Mathematical Modeling:
The steel plate actual (real) thickness is 10~40mm, and zero point, self adaptation numerical value was 0.1~0.3;
The steel plate actual (real) thickness is>40mm~≤ 60mm, zero point, self adaptation numerical value was 0.3~0.5;
The steel plate actual (real) thickness is>60mm~≤ 80mm, zero point, self adaptation numerical value was 0.5~0.6;
Steel plate actual (real) thickness>80mm, zero point, self adaptation numerical value was 0.7;
Mill speed is controlled at 5.5~6.5m/s;
Start rolling temperature is 1000~1100 ℃, and finishing temperature is 950~1050 ℃;
The single pass heavy deformation of last twice is 10~15%;
Maximum rolling force is 80~95MN, peak torque 3500~3800kNm, maximum reduction 30~45mm, maximum depression rate 35~45%;
It is 900~1000 ℃ that setting begins to cool down temperature, and final cooling temperature is 800~900 ℃;
Cooldown rate is 2~5K/s.
2. the production method of longitudinal thickness-variable steel plate according to claim 1, is characterized in that, when steel billet is come out of the stove, the upper surface temperature is higher 30 ℃ than underlaying surface temperature.
3. the production method of longitudinal thickness-variable steel plate according to claim 1, is characterized in that, described upper and lower work roll diameter is poor is 3mm.
4. the production method of longitudinal thickness-variable steel plate according to claim 1, is characterized in that, the steel plate start rolling temperature is 1050 ℃, and finishing temperature is 1000 ℃.
5. the production method of longitudinal thickness-variable steel plate according to claim 1, is characterized in that, the single pass heavy deformation of described last twice is 12%.
6. the production method of longitudinal thickness-variable steel plate according to claim 1, is characterized in that, it is 950 ℃ that described setting begins to cool down temperature, and final cooling temperature is 850 ℃.
7. the production method of longitudinal thickness-variable steel plate according to claim 1, is characterized in that, it is 3K/s that steel plate rolls rear cooldown rate.
CN201010282876.1A 2010-09-16 2010-09-16 Production method of longitudinal thickness-variable steel plate CN102397875B (en)

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CN102989786B (en) * 2012-12-20 2015-03-25 济钢集团有限公司 Optimal control system of shape and thickness of steel plate
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CN105605404A (en) * 2016-03-15 2016-05-25 莱芜美澳冶金科技有限公司 Special-shaped-cross-section hot-rolled steel plate coil and manufacturing method thereof
CN105806302B (en) * 2016-03-25 2018-03-30 首钢总公司 The experimental method of inside steel billet metal strain in a kind of test operation of rolling
CN108284130A (en) * 2017-01-09 2018-07-17 宝山钢铁股份有限公司 A kind of milling method of cold rolling Varying-thickness plank
CN108339857B (en) * 2017-01-22 2019-10-25 宝山钢铁股份有限公司 A kind of profile regulation method rolling thickening plate
CN108396245B (en) * 2017-02-08 2019-12-13 鞍钢股份有限公司 345 MPa-level LP steel plate and production method thereof
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CN108397682A (en) * 2017-02-08 2018-08-14 鞍钢股份有限公司 A kind of longitudinal direction section steel plate and its production method
CN108393350A (en) * 2017-02-08 2018-08-14 鞍钢股份有限公司 A kind of longitudinally abnormity disconnected section steel plate and its production method
CN108397681A (en) * 2017-02-08 2018-08-14 鞍钢股份有限公司 A kind of longitudinal direction odd-shaped cross section steel plate and its production method
CN107716550B (en) * 2017-09-09 2019-03-29 首钢集团有限公司 A kind of production method of low-alloy longitudinal thickness-variable steel plate
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EP0159818A1 (en) * 1984-04-04 1985-10-30 Imi Titanium Limited Method and apparatus for the production of metal products
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