CN101831526A - Method for processing super-thick plate - Google Patents
Method for processing super-thick plate Download PDFInfo
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- CN101831526A CN101831526A CN 201010186352 CN201010186352A CN101831526A CN 101831526 A CN101831526 A CN 101831526A CN 201010186352 CN201010186352 CN 201010186352 CN 201010186352 A CN201010186352 A CN 201010186352A CN 101831526 A CN101831526 A CN 101831526A
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Abstract
The invention relates to a method for processing a super-thick plate, which comprises the following steps of: steelmaking, namely controlling C and Mn components at the middle upper limit of standard prescribed components, and controlling the mass of P and S to be less than or equal to 0.015 percent respectively; refining, namely deeply removing S to ensure that the S content is less than or equal to 0.005 percent; vacuum treatment; continuous casting; heating; rolling; normalizing after rolling; and normalizing. The holding time of vacuum treatment of below VD 0.5 torr in the step c is 15 minutes or RH vacuum treatment time is over 15 minutes, titanium is added after the vacuum treatment, and the component is controlled based on 0.01 to 0.025 percent of Ti. The tundish superheat degree in the step d is between 10 and 20 DEG C. The method can solve the problems of processing quality and cost of the super-thick plate in the prior art.
Description
Technical field
The invention belongs to steel plate processing and manufacturing technical field, particularly relate to a kind of working method of special heavy plate.
Background technology
Super-thick steel plate refers generally to thickness and is used for dual-use various important structure greater than the steel plate of 60mm more, and quality product is strict with.For guaranteeing the special heavy plate inner quality, the compression ratio of the rolling super-thick steel plate of general requirement (former material base thickness and Finished Steel plate thickness ratio) is greater than 3.0.Little as compression ratio, problems such as steel plate inside is loose, the segregation removing is not enough can appear when producing with usual method.Modern super-heavy plate mill is a raw material with continuously cast bloom all generally, and past continuous casting steel billet maximum ga(u)ge is 300mm, can be used for producing the 100mm Plate Steel, but not enough to the steel plate compression ratio more than the 100mm.For this reason, all adopt an effective measure in research and improve special heavy plate production in countries in the world.The main mode of production of special heavy plate has at present:
(1), strengthens slab caster and produce slab thickness
Modern super-heavy plate mill is a raw material with continuously cast bloom all generally.The place's of mistake continuous casting steel billet maximum ga(u)ge is 300mm, can be used for producing the 100mm Plate Steel, but not enough to the steel plate compression ratio more than the 100mm.The Japan pourable 245～400mm of the vertical casting machine of Nippon Steel the thickest 600mm, strand width 900～2360mm can produce the 40Kg grade steel plate of 350mm, the boiler of 200mm, pressurized vessel high tensile steel plate.Dillingen, Germany also has a vertical casting machine, produces maximum ga(u)ge 400mm, maximum width 2200mm slab.Precious industry company of China Shougang Group and company of the first Qin also order 400mm ultra-thick plate base casting machine to siemens respectively; Middle smelting Southern Co. also prepares to provide 400mm ultra-thick plate base casting machine to Baosteel and Wuhan Iron and Steel Plant, is carrying out the exchange of technology in early stage.
(2), the gross distortion coefficient is rolling
For reaching good core performance, need with the gross distortion coefficient rolling.Deformation coefficient (penetration coefficient of core is goed deep in distortion) depends on the area of stress zone of action between every time draft, working roll radius and roll and the material.Deformation coefficient is higher, and it is high more then to reduce loose efficient.In order to improve slab thickness center performance, must the least possible passage be rolled, every time has high as far as possible draft, i.e. the gross distortion coefficient.
A prerequisite that is rolled with the gross distortion coefficient is that high-power milling train is arranged, Di Lingen 5500mm four-high mill maximum rolling force 108000KN, peak torque 4500KNm, the single pass maximum reduction can reach 60mm, and core quality in the production special heavy plate is given security.
China existing many cover 5m, 4.3m, 3.8m stiff mill have been created good condition for producing special heavy plate.
(3), from rolling to electroslag ingot with common cast slab ingot
General in the past rolling for the super 150mm steel plate of thickness with the Large Flat steel ingot.Adopt electroslag ingot as the plate mill raw material through overtesting, because its dense structure, segregation is little, can reduce the compression ratio number.Wuyang steel mill successfully gone into operation maximum 40 tons, the big template ingot of cross dimensions 2000 * 950mm electroslag furnace have accumulated rich experience for producing special heavy plate.
(4), forging-rolling
The method of producing the high quality special heavy plate in the past is with swaging machine large-scale steel ingot to be forged into steel billet, send mill milling to become slab again.But this kind method cost is too high, is difficult for promoting the use of.
The JFE patent, can after width and the two-way forging of thickness direction, send mill milling again with continuous casting steel billet, produce qualified special heavy plate at compression ratio under less than 2.0 condition, existing compression ratio is 1.27～1.9 promptly to produce the examples of many successful of 160～220mm steel plate in factory's practice
(5), the continuous caster end is depressed method greatly
The SUMITOMO CHEMICAL metal is controlled strand center porosity when continuous casting, promptly depress roller is set, greater than 80% o'clock, strand is given to depress greatly at strand center solid rate at the slab caster end, reach and reduce strand center porosity degree, thereby reduce rolling compression ratio.Sumitomo company o'clock produces the good special heavy plate of internal soundness with aforesaid method in compression ratio 1.5～2.5, rolls out the 200mm special heavy plate as the 300mm heavy slab.
(6), welding composite steel billet method
Japan JFE proposes two relative junction surfaces of continuous casting steel billet are ground off with amary tape grinding machine the casting skin face of slab; the about 2mm of grinding thickness; be placed in the vacuum chamber after slab stacked; with electrons leaves welding or inert-gas arc welding sealing around the slab is welded; send plate mill to be rolled into slab (Heating temperature is greater than 1000) then; become the 340mm special heavy plate with (380mm+380mm) slab rolling, compression ratio 1.8.
Ji steel " a kind of processing method of producing special heavy plate " patent mainly overcomes conventional model casting base and esr base and produces the shortcoming that super-thick steel plate exists.Its key step is, briquet cutting scale, the whole base of machinery (removing strand single face zone of oxidation, straight and even, cleaning), assembly clamping (will process back two bases cleaning face superimposed relatively, align clamping) with milling machine, planer or shot-peening, pack that the electron beam welding machine vacuum chamber vacuumizes into, electrons leaves welding sealing side seam assembly, assembly go into stove heat, through production super-thick steel plates such as temperature control hot rollings.This processing method is than traditional esr production technique productive rate height, and power consumption reduces in a large number, and investment of production equipment is less, and production cost is low.Compare with the conventional die castings production technique, solved large-scale ingot casting heart portion's segregation and loose problem limitation; The lumber recovery height, blank combination lumber recovery is more than 90%.But this method also only limits to scheme, no production actual achievement.
(7), there is defective in prior art
The systems engineering that special heavy plate production is a specification of quality height, difficulty is big involves all many-sides such as steel-making, refining, continuous casting, rolling, thermal treatment, at present special heavy plate production technique scrutiny not.
The special heavy plate inner quality depends on the quality of steel-making, continuous casting to a great extent, and above-mentioned special heavy plate production technology is a bit studied, explored, and can not directly use, instruct production.
More than 6 kinds of special heavy plate mode of production equipment have high input; On traditional method, need to increase series of processes, operation and management inconvenience; And general Wide and Thick Slab factory can't produce the above special heavy plate of 100mm, and technical limitation is big.
Summary of the invention
The technical problem to be solved in the present invention provides a kind of working method of special heavy plate, to solve the quality and the cost problem of the processing of special heavy plate in the prior art.
The technical solution adopted for the present invention to solve the technical problems is: the working method that a kind of special heavy plate is provided.
Principle of the present invention: reduce the principle of inclusion, utilization utilization " oxide compound metallurgy " in phosphorus P, sulphur S content, the minimizing molten steel, improve the internal soundness of continuously cast bloom; Homogeneous heating slab composition and tissue, gross distortion coefficient be rolling, be aided with steel plate thermal treatment, improves the special heavy plate internal soundness.
(1), reduces P, S content in the steel, the toughness of assurance steel plate and minimizing steel plate anisotropy; Raising carbon C, manganese Mn content guarantee the intensity behind the steel plate thickness effect.
(2), the refining of LF stove, guarantee that steel inclusion fully floats, reduce steel inclusion; Dark desulfurization S further reduces sulphur S content in the steel in the LF stove; Calcium Ca handles the form of improving manganese sulfide MnS in the strand after the refining;
(3), vacuum-treat reduces that gas is mingled with in the steel, particularly reduces hydrogen H content in the steel, improves the molten steel purity.The principle of utilization " oxide compound metallurgy " adds trace amount of titanium and handles, and promotes titanium sesquioxide Ti2O3 to separate out at early solidification, with thinning solidification structure, and refinement continuously cast bloom base tissue; Add trace amount of titanium and handle, suppress grain growth during the control reheat, separate out titanium nitride TiN control grain growth after rolling.
(4), high temperature, long-time heating improve the component segregation of strand, the composition homogeneous microstructure that slab is come out of the stove; High temperature, depress greatly, rolling at a slow speed, promote the deformation rate of slab core, the crystal grain of recrystallize refinement steel plate fully repeatedly, guarantee the internal soundness of steel plate.
(5), heat treatment normalizing improves the over-all properties of steel, improves the obdurability coupling of special heavy plate.
(6), the UT (Ultrasonic Testing) internal soundness of steel plate that guarantees to dispatch from the factory.
Beneficial effect
Compared with prior art, the present invention has the following advantages:
It is little that a, special heavy plate of the present invention produce compression ratio, and compression ratio only is 1.73;
B, special heavy plate production process of the present invention are simple, and producing special heavy plate does not increase equipment;
It is good that c, the present invention produce the special heavy plate internal soundness;
It is even that d, the present invention produce the special heavy plate performance, and performance has big surplus capacity.
Description of drawings
Fig. 1 is a schema of the present invention.
Embodiment
Below in conjunction with specific embodiment, further set forth the present invention.Should be understood that these embodiment only to be used to the present invention is described and be not used in and limit the scope of the invention.Should be understood that in addition those skilled in the art can make various changes or modifications the present invention after the content of having read the present invention's instruction, these equivalent form of values fall within the application's appended claims institute restricted portion equally.
Embodiment 1
As shown in Figure 1, method flow of the present invention is:
(1), technical process:
Converter steelmaking-concise-vacuum outgas (VD, RH)-continuous casting-heating-rolling-finishing-flaw detection-service check.
(2), steel making working procedure
Carbon C, manganese Mn composition are controlled by the middle upper limit, phosphorus P≤0.015%, sulphur S≤0.015%,
(3), refining
Dark desulfurization S handles and makes sulphur S≤0.005%; Feed silicon-calcium (Si-Ca) line after the refining of LF stove.
(4), vacuum processing time:
The following hold-time 15min of VD0.5 holder or more than the RH vacuum processing time 15min; Add trace amount of titanium after the vacuum and handle [Ti] 0.010%～0.025%.
(5), continuous casting
10～20 ℃ of middle bag superheating temperature controls; Plate strand production allusion quotation pulling rate reduced by one grade of execution during the continuous casting pulling rate adopted; Produce thickness of strand 260mm (casting machine production maximum ga(u)ge).
(6), heating
Plate production improves 30--50 ℃ in the Heating temperature ratio, and tapping temperature is greater than 1150 ℃; Rate of heating 10～15min/cm, total time inside furnace is greater than 5h.
(7), rolling
Adopt " high temperature, depress greatly, at a slow speed " rolling technique, do not use automatic rolling, manually rolling; The reduction schedule establishment is selected maximum reduction in pass for use by the ability of milling train, and maximum percentage pass reduction can reach more than 15%.
(8), roll postcooling
Roll back ACC cooling and select weak cold technology, be cooled to 700～730 ℃ of air coolings.
(9), normalizing
Temperature is selected 20 ℃ of plate hights (as 910-930 ℃ of Q345 series normalizing temperature) in the ratio; Time inside furnace calculates by 1.5～2.0min/mm * thickness of slab mm; Air cooling.
(10), finishing, flaw detection, check
Require to carry out finishing, flaw detection, check according to correlation technique.
Special heavy plate production performance and low power are checked actual achievement
The typical rolling procedure of table 1
Table 2 is produced special heavy plate (steel plate is normalizing not) performance, flaw detection actual achievement
Can find out from table 2: plate property is even, and its UT (Ultrasonic Testing) is qualified, and the steel plate internal soundness is good.
Claims (5)
1. the working method of a special heavy plate is characterized in that: may further comprise the steps,
A. steel-making, the Composition Control of carbon C, manganese Mn is in the middle upper limit of standard code, and the quality of phosphorus P, sulphur S is respectively smaller or equal to 0.015%;
B. refining, dark desulfurization S, its content is smaller or equal to 0.005%;
C. vacuum-treat;
D. continuous casting;
E. heating;
F. rolling;
G. roll the back normalizing;
H. normalizing.
2. the working method of a kind of special heavy plate according to claim 1, it is characterized in that: vacuum-treat VD0.5 among the described step c following hold-time 15min of holder or more than the RH vacuum processing time 15min, add titanium after the vacuum-treat, composition is pressed Ti 0.01%～0.025% control.
3. the working method of a kind of special heavy plate according to claim 1 is characterized in that: 10 ℃～20 ℃ of the middle bag superheating temperature in the described steps d.
4. the working method of a kind of special heavy plate according to claim 1, it is characterized in that: the speed of the heating among the described step e is 10～15min/cm, and tapping temperature is greater than 1150 ℃.
5. the working method of a kind of special heavy plate according to claim 1 is characterized in that: the back ACC that rolls in the described step g is cooled to weak cold technology, is cooled to 700 ℃～730 ℃.
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| CN 201010186352 CN101831526A (en) | 2010-05-27 | 2010-05-27 | Method for processing super-thick plate |
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| CN 201010186352 CN101831526A (en) | 2010-05-27 | 2010-05-27 | Method for processing super-thick plate |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102409221A (en) * | 2011-12-02 | 2012-04-11 | 武汉钢铁(集团)公司 | Method for controlling edge cracks of peritectic steel containing niobium or boron |
| CN106552914A (en) * | 2015-09-24 | 2017-04-05 | 宝山钢铁股份有限公司 | A kind of manufacture method of the continuous casting process and continuous casting thick plate of slab |
| CN107502705A (en) * | 2017-07-26 | 2017-12-22 | 舞阳钢铁有限责任公司 | A kind of production method for controlling ultra-thick plate performance difference in a thickness direction |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN106552914A (en) * | 2015-09-24 | 2017-04-05 | 宝山钢铁股份有限公司 | A kind of manufacture method of the continuous casting process and continuous casting thick plate of slab |
| CN106552914B (en) * | 2015-09-24 | 2018-10-02 | 宝山钢铁股份有限公司 | A kind of continuous casting process of slab and the manufacturing method of continuous casting thick plate |
| CN107502705A (en) * | 2017-07-26 | 2017-12-22 | 舞阳钢铁有限责任公司 | A kind of production method for controlling ultra-thick plate performance difference in a thickness direction |
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Application publication date: 20100915 |