CN103111464B - Manufacturing method of super-thick steel plate - Google Patents
Manufacturing method of super-thick steel plate Download PDFInfo
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- CN103111464B CN103111464B CN201310069713.9A CN201310069713A CN103111464B CN 103111464 B CN103111464 B CN 103111464B CN 201310069713 A CN201310069713 A CN 201310069713A CN 103111464 B CN103111464 B CN 103111464B
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Abstract
The invention discloses a manufacturing method of a super-thick steel plate (thickness is 60 millimeters) and belongs to the steel plate production field of metallurgical industry. The manufacturing method of the super-thick steel plate comprises the following steps: firstly, sending a plate blank which is heated to a certain temperature and removed an oxide scale to cooling space to conduct forced cooling, surface temperature cooling a phase transition temperature of the super-thick plate material above Ar 1, then by short time temperature returning, the surface temperature rising to the range between 780 DEG C and 880 DEG C, and sending the plate bland to a rolling mill to roll as soon as possible; when the surface temperature of the plate blank being higher than 880 DEG C, needing to conduct the forced cooling again, and then conducting the subsequent rolling. A cooling-temperature returning-rolling process can be repeated for many times if needed till rolling to the needed thickness of the super-thick steel plate. The manufacturing method of a super-thick steel plate can increase dependent variable of the central area by increasing temperature difference between a surface layer and the central area and has the advantages of being beneficial to refining central organization and improving impact toughness, beneficial to removing center porosity of the super-thick plate, and capable of reducing double strand shape on lateral sides of the super-thick plates. The manufacturing method of a super-thick steel plate further has the advantages of being saving in investment, and flexible to operate.
Description
Technical field
The invention belongs to the Plate Production field of metallurgy industry, relate to the special heavy plate manufacture method of a kind of thickness >=60mm, be intended to solve rolling special heavy plate center mechanical property on the low side, and operation of rolling light plate side twin drum type or the limit portion folding problem that caused by the further rolling of twin drum type.
Background technology
Under the requirement of maximization and high efficiency construction, adopt a large substance extra wide super-thick steel plate, can reduce weld seam.In the construction of ocean platform, the steel of high strength, large thickness are widely used, and especially need thickness to reach 80mm for structures such as suspension centres; Tooth bar steel in jack-up unit structure, requiring yield strength rank is 690MPa, thickness reaches 110 ~ 150mm.Hydroelectric project penstock adopts high-intensity 46mm, 60mm and 70mm steel plate, and the maximum floor thickness of bifurcated pipe is 150mm.International bridge adopts a point arch-type structure conventionally, and steel plate maximum ga(u)ge used has also reached 150mm.
The purposes of special heavy plate is very extensive, uses at aspects such as ships, ocean platform, boiler vessel, pressure vessel, chemical reaction synthetic tower, heavy oil HTHP desulfurizer, water power turbine, bridge, machinery base and parts, weapons, mould, plate armour and building elements in a large number.Along with the development of technology and the maximization of industrial equipment, to the demand day by day of large substance high-quality special heavy plate, simultaneously world steel industrial development course also shows, in all kinds of sheet material, the production technology of special heavy plate is the important symbol of a national steel and iron industry level.
At present, special heavy plate is produced following several technique:
1) steel ingot rolling mill practice:this is a kind of traditional special heavy plate production technology.Chinese patent application CN 102345047A: " a kind of 150mmQ245R special heavy plate and production method thereof " introduced its method and be: by the pretreatment of KR molten iron, converter smelting, Argon processing, LF refining, VD refining, die casting, heating, controlled rolling and controlled cooling, cooling in heap, Technology for Heating Processing, can produce 150mm thickness steel plate.Document: " research and development of low-alloy structural steel Q345B 420mm special heavy plate " (" China is metallurgical " the 01st phase in 2012) introduced thickness and reached 420mm, guaranteed cost, protect flaw detection, Q345B level super-thick steel plate production process route cheaply, comprising: the molten iron KR desulfurization-100t converter-LF refining-VD vacuum outgas-die casting cast-steel ingot demoulding-Heating Steel Ingots-de-scaling-mill milling-slow cooling-surface inspection-finishing-heat treatment-flaw detection-Performance Detection-warehouse-in.As can be seen here, not only loaded down with trivial details but also casting flaw is also more owing to producing slab with ingot casting, therefore lumber recovery is low compared with continuous casting billet, the production work amount time larger, that consume is longer.In addition, because the lumber recovery that adopts steel ingot rolling slab and special heavy plate often approximately 70%.Adopt electroslag remelting steel ingot rolling, can improve by electroslag remelting the degree of purity of steel, reduce non-metallic inclusion, tissue and chemical composition are all more even, and the lumber recovery that ingot rolling is become a useful person is up to 81.5%.But this explained hereafter efficiency is low, and need to consume mass energy, and production cost is too high, multiplexly require during high, slab that mechanical property requirements is high or special heavy plate produce at performance uniformity.
2) steel ingot forging-rolling technique:develop steel ingot in the seventies in last century and forged rolling technique, i.e. steel ingot rolling after hydraulic press cogging (forging base).The benefit of this technique is the loose seam that the forging before rolling makes steel ingot core, improves ingot quality.The hydraulic press that Kawasaki Steel Shui Dao factory goes into operation for 1971 reaches 6000 tons, and the maximum ga(u)ge of producing steel plate is 300mm.But the technology of forging-Rolling Production slab is the production technology of a kind of small lot, poor efficiency.
) continuous casting billet milling technique:according to existing steel rolling process, produce special heavy plate and need the continuous casting steel billet that thickness is larger, but common continuous casting steel billet thickness is generally at 200～300mm, and industrial continuous casting steel billet maximum ga(u)ge is 400mm in the world at present, and the production of the continuous casting billet of thickness more than 400mm also exists certain difficulty.When tradition cut deal or special heavy plate rolling, sotck thinkness conventionally all will be more than 5 to the compression ratio of finished product thickness, if realize under the prerequisite that does not change technology and equipment that to produce be more difficult so will produce more than 100mm special heavy plate, be mainly that the mechanical property at special heavy plate middle part cannot effectively ensure.The advantage that continuous casting billet is produced special heavy plate is that rolling lumber recovery can reach more than 90%.
) continuous casting billet milling-Technology for Heating Processing:chinese patent application CN 101831526A " a kind of processing method of special heavy plate " and document " research of High-Strength Low-Alloy STE460 super-thick steel plate pilot production " (" Wide and Thick Slab ", 05 phase in 1999) introduce to adopt and rolled the method for accelerating cooling method production high-performance special heavy plate after rear normalizing and normalizing, this method can effectively be improved the low-temperature flexibility of special heavy plate, but can cause strength decreased, and production cost is high.20 century 70s, to be that Heat-Treatment of Steel technique is changed into by normalizing modified by manufacturing the Mn～Mo～Ni of nuclear pressure vessel for U.S. ASME standard.
) roll-bonding method:chinese patent application CN101773931A " a kind of method of rolling special thick board by means of vacuum compositing ", the technique of producing special heavy plate by welding blank and milling method has all been proposed in multinomial patent of Chinese patent application CN101439348A " a kind of process of producing special heavy plate " and CN101590596A " a kind of method of manufacturing extra-thick plate blank by accumulative roller welding process ", adopt two and two blocks of above continuous casting steel billets process welding assemblies, be rolled into a special heavy plate.Said method is intended to continuous casting billet milling slab or the special heavy plate by relative thin, solves the problem of producing the required Compression Ratio of Casting Billet of special heavy plate.
In above-mentioned special heavy plate manufacture method, all there is a phenomenon in its operation of rolling, is exactly because sotck thinkness is large, has inhomogeneous deformation in contact in rolling, can be divided into stagnant zone I, compressional zone II and drawing zone III, as shown in Figure 1 according to stress state.In deformation process, only have thickness be the top layer metal of hc because the compression of thickness direction exceedes the constraint yield stress of workpiece, produce hc thickness area yield deformation.All the other regions of thickness direction are indeformable, cause the side of rolling steel billet to form " twin drum " shape, as shown in Figure 2, if this shape remains to finished product, can reduce the lumber recovery of blank.Meanwhile, the inhomogeneous deformation of thickness direction, can be in the compression of top layer hc thickness area formation rolling direction, and middle part produces the tension of rolling direction, and middle part stress state is worsened.In some method, adopt the rolling of vertical miller to carry out partly to eliminate " twin drum " shape, but the flakiness ratio of special heavy plate is large, indeformable or the deflection in central area still cannot effectively improve less, the effect that makes thermal processing distortion improve microstructure and property is restricted, therefore be not out of shape or be out of shape little central area at deformation and recrystallization, eliminate segregation, reduce poor far beyond blank top layer of the aspect such as loose.
Summary of the invention
The present invention is a kind of technique of improving thickness direction inhomogeneous deformation in the special heavy plate operation of rolling, can increase the distortion at blank middle part in the special heavy plate operation of rolling, suppress " twin drum " shape of rolling steel billet side, improve central area austenite recrystallization state, reduce center porosity.
For the even technique of blank temperature in the conventional special heavy plate operation of rolling, the Temperature Distribution of its thickness direction can be similar to be thought uniformly, the present invention adopts the method that reduces blank skin temperature, the temperature of sotck thinkness direction is cooled heterogeneous through artificial pressure, after blank skin temperature reduces, can make resistance of deformation or the yield strength of top layer metal increase, distortion difficulty increases, thereby suppress the flow of metal of blank top layer, and increase the distortion of central area with this, thereby make the compression of thickness direction exceed yield stress, produce distortion more uniformly, as shown in Figure 3.
The present invention is by taking following technical scheme to realize:
1. will be heated to temperature and force cooling except the slab of iron scale is transported to cooling zone, force the cooling velocity scope of blank surface when cooling at 10-80 DEG C/s, more than surface temperature is cooled to the phase transition temperature Ar1 temperature of rolled steel, the too low billet surface that causes of surface temperature that prevents blank returns warm overlong time, affects production efficiency.
2. cooled blank returns temperature through the short time, and surface temperature is risen between 780～900 DEG C.The suitable temperature of returning, the rolling that can the improve blank state of nipping, the problem such as prevent from skidding or be difficult to nip; But the temperature on top layer is higher, it is more weak that it suppresses effect of top layer flow of metal, returns the temperature difference at steel billet top layer after temperature and center between 150～400 DEG C.
3. return warm blank after predetermined temperature, need to send into as early as possible mill milling, in the scope of mill capacity license, be rolled, prevent from returning for a long time temperature the temperature difference of top layer and central area temperature is dwindled, and the reduction of the distortion of the central area causing thus.
4. for steel ingot or thick continuous casting billet, need the rolling of a lot of passages, the steel billet of surface cooling can unavoidably can produce surface temperature and raise in the operation of rolling, top layer and the central area temperature difference reduce, the inhibitory action of surface deformation reduces, therefore after skin temperature is higher than 900 DEG C, need to again carry out the cooling warm process of then returning to rolling blank, remain that the temperature difference at steel billet top layer and center is between 150～400 DEG C.
5. according to the thickness of the thickness of blank and final finished, if needed, can repeatedly repeat to force cooling-return the process of temperature-rolling, until be rolled down to required thickness.
6. the type of cooling that pressure of the present invention is cooling adopted can select to spray water cooling or spray cooling (being air-water combination cooling).
7. slab of the present invention can be continuous casting steel billet, electroslag remelting base, and steel ingot bloom, welding composite billet, applicable sotck thinkness scope is at 150～600mm.
compared with prior art, the present invention has following features:
1, can reduce the compression ratio requirement of blank.Compared with existing rolling mill practice, the present invention can, by controlling steel billet top layer and the heart portion temperature difference, increase the deflection of blank central region, improves central region metallographic structure, thereby can reduce the requirement to rolling compression ratio.
2, lumber recovery is higher.The present invention can, by controlling steel billet top layer and the heart portion temperature difference, increase the deflection of blank central region, can reduce the width of " Double drum type " or the width of folded edges of blank side in the operation of rolling, therefore can reduce trimming amount and crop amount, improves lumber recovery.
3, the internal soundness of special heavy plate is better.The present invention can be by controlling steel billet top layer and the heart portion temperature difference, increase the deflection of blank central region, can obtain more tiny crystal grain in the central region of rolling special heavy plate, make the loose micropore at middle part be out of shape seam, reduce the loose rank of heart portion, the internal soundness of effectively improving special heavy plate, effectively improves special heavy plate central area mechanical property.
4, can reduce the production cost of special heavy plate., adopt the present invention effectively to improve special heavy plate central region quality under certain condition, obtain fine tissue, therefore can improve the toughness of steel plate, the steel plate of part specific thicknesses can be cancelled normalizing heat treatment, reduces energy consumption cost.
brief description of the drawings:
The stress state of Fig. 1 roll gap and sotck thinkness direction distribution of the compressive stress.
Fig. 2 inhomogeneous deformation causes special heavy plate side Double drum type.
Fig. 3 forces Temperature Distribution and the stress distribution of cooling rear sotck thinkness direction.
Related symbol explanation:
| I-stagnant zone | The effective width of W-rolling blank |
| II-compressional zone | The thickness of h-rolling blank |
| III-drawing zone | Hc-surface deformation district thickness |
| -constraint yield stress | The blank uniform temperature of-traditional rolling distributes |
| -rolling direction compression | -the present invention adopts the non-homogeneous Temperature Distribution of blank |
| -thickness direction compression | ? |
detailed description of the invention:
The present invention will be described to enumerate specific embodiment below; be necessary to be pointed out that at this following concrete implementation step is only for the invention will be further described; do not represent limiting the scope of the invention, some nonessential amendments that other people make according to the present invention and adjustment still belong to protection scope of the present invention.
embodiment 1:
Adopt the Q345 continuous casting billet of 150mm thickness, mill product thickness 60mm.Continuous casting billet is heated to after 1180 DEG C, after high-pressure water descaling, enter force cooling zone carry out cooling, force the type of cooling select aerosol cooling, the 10 DEG C/s of cooling velocity of blank surface; The continuous casting of 150mm thickness is carried out once cooling, while going out cooling zone, blank surface temperature is about 600 DEG C, blank carries out air cooling and returns temperature and make its surface be increased to 780～820 DEG C afterwards, send into fast subsequently mill milling, draught per pass is 22～30mm, after rolling 3 passages, surface of steel plate temperature is still lower than 880 DEG C, blank after rolling to becoming thickness 60mm special heavy plate.After rolling, accelerated cooling device is cooling afterwards, then by its cooling in heap and follow-up finishing processing, obtains the finished product special heavy plate of 60mm thickness.
embodiment 2:
Adopt the continuous casting Q460 blank of 300mm thickness, mill product thickness 120mm.Continuous casting billet is heated to after 1200 DEG C, after high-pressure water descaling, enter force cooling zone carry out cooling, force the type of cooling select water spray cooling, the 40 DEG C/s of cooling velocity of blank surface; First the continuous casting of 300mm thickness is carried out cooling for the first time, while going out cooling zone, blank surface temperature is about 570 DEG C, blank carries out air cooling and returns temperature and make its surface be increased to 820 DEG C～850 DEG C afterwards, send into fast subsequently mill milling, draught per pass is 22～30mm, after rolling 4 passages, workpiece thickness is at 200mm; Surface of steel plate temperature is a little more than 880 DEG C; Now, intermediate blank is carried out cooling for the second time, while going out cooling zone, blank surface temperature is about 570 DEG C, intermediate blank air cooling returns temperature to 800 DEG C～830 DEG C afterwards, immediately sends into milling train milling train, and draught per pass is 22～30mm, after rolling 3 passages, be rolling to into the special heavy plate of 120mm thickness.After rolling, accelerated cooling device is cooling afterwards, then by its cooling in heap and follow-up finishing processing, obtains final finished.
embodiment 3:
The welding composite blank of 600mm thickness, mill product thickness 200mm.Continuous casting billet is heated to after 1200 DEG C, after coming out of the stove, after high-pressure water descaling, be directly rolled, when being rolled down to after 400mm thickness, then enter force cooling zone carry out cooling, force the type of cooling select water spray cooling, the 80 DEG C/s of cooling velocity of blank surface; First the continuous casting of 400mm thickness is carried out cooling for the first time, while going out cooling zone, blank surface temperature is about 570 DEG C, blank carries out air cooling and returns temperature and make its surface be increased to 880 ± 15 DEG C afterwards, send into fast subsequently mill milling, draught per pass is 25～35mm, after rolling 3 passages, workpiece thickness is at 300mm; Surface of steel plate temperature is higher than 900 DEG C; Now, intermediate blank is carried out cooling for the second time, while going out cooling zone, blank surface temperature is about 570 DEG C, intermediate blank air cooling returns temperature to 800～830 DEG C afterwards, immediately sends into milling train milling train, and draught per pass is 22～30mm, after rolling 3 passages, be rolling to into the special heavy plate of 200mm thickness.Afterwards, special heavy plate, through accelerating cooling or air cooling, cooling in heap and follow-up finishing processing, obtains final finished special heavy plate.
Claims (2)
1. the manufacture method of a special heavy plate, it is characterized in that, processing step comprises: first, also carry out cooling except the slab of iron scale is transported to cooling zone by being heated to 1180～1200 DEG C, more than surface temperature is cooled to Ar1, return temperature through the short time afterwards, surface temperature is sent into mill milling after rising between 780～900 DEG C as early as possible; When rolling blank surface temperature is during higher than 900 DEG C, need to again send into cooling zone cooling, then carry out follow-up rolling; If need, can repeatedly repeat cooling-return temperature-operation of rolling, until be rolled down to predetermined thickness;
Described hot blank being cooled to before rolling forced cooling, force the cooling velocity scope of blank surface when cooling at 10-80 DEG C/s, make blank surface return temperature through air cooling afterwards, surface temperature rises between 780～900 DEG C, the temperature and time heating up determines by the required temperature difference in blank top layer and central area, and surface temperature is sent into immediately mill milling after predetermined temperature range;
Ensure that the surface temperature of rolled slab is between 780～900 DEG C, and keep the temperature difference at steel billet top layer and center between 150～400 DEG C, carry out one or many pressure off time in rolling cooling, until be rolled down to predetermined thickness.
2. the manufacture method of a kind of special heavy plate according to claim 1, is characterized in that: slab used is continuous casting steel billet, electroslag remelting base, steel ingot bloom or the welding composite billet of thickness 150～600mm.
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| CN104525588B (en) * | 2014-12-15 | 2016-10-05 | 东北大学 | A kind of thick steel plates course of hot rolling that improves deforms infiltrative method |
| CN106140815A (en) * | 2016-08-30 | 2016-11-23 | 华北理工大学 | A kind of milling method of ultra-thick plate |
| CN107774711B (en) * | 2016-08-31 | 2019-03-22 | 鞍钢股份有限公司 | A kind of composite blank production method producing ultra-thick steel plates |
| CN107931337B (en) * | 2016-10-12 | 2019-12-24 | 中南大学 | Differential temperature rolling method of AlZnMgCu aluminum alloy thick plate |
| CN109321818B (en) * | 2017-07-31 | 2020-08-28 | 东北大学 | Easily-welded high-temperature hot-rolled thick steel plate and preparation method thereof |
| CN108486341B (en) * | 2018-04-16 | 2019-12-03 | 江苏省沙钢钢铁研究院有限公司 | The manufacturing method of steel plate |
| CN109365529B (en) * | 2018-10-08 | 2021-04-27 | 鞍钢股份有限公司 | Production method of austenitic stainless steel medium plate |
| CN110394363B (en) * | 2019-08-02 | 2021-02-19 | 宝武集团鄂城钢铁有限公司 | Production method for rolling high-quality carbon structural steel with thickness of more than or equal to 60mm by utilizing wide and thick plate finishing mill at differential temperature |
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| JP3170375B2 (en) * | 1993-01-25 | 2001-05-28 | 日新製鋼株式会社 | Temperature prediction method for hot rolled steel sheet |
| US5710411A (en) * | 1995-08-31 | 1998-01-20 | Tippins Incorporated | Induction heating in a hot reversing mill for isothermally rolling strip product |
| CN100446919C (en) * | 2005-06-30 | 2008-12-31 | 宝山钢铁股份有限公司 | Production process of cold rolled orientation-free electrical steel plate with low iron loss and high magnetic induction |
| CN101660104A (en) * | 2008-08-25 | 2010-03-03 | 鞍钢股份有限公司 | High-temperature resistant tempered heavy plate with low susceptibility to welding crack and production method thereof |
| CN101914665A (en) * | 2010-08-30 | 2010-12-15 | 南京钢铁股份有限公司 | Process for producing thick plate of plastic die steel |
| CN202070578U (en) * | 2011-03-30 | 2011-12-14 | 鞍钢股份有限公司 | Intermediate blank cooling device |
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