CN102876997A - Easy-welding tempering high-strength steel plate for ocean platform and production method thereof - Google Patents
Easy-welding tempering high-strength steel plate for ocean platform and production method thereof Download PDFInfo
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Abstract
The invention discloses an easy-welding tempering high-strength steel plate for an ocean platform and a production method thereof. The easy-welding tempering high-strength steel plate for the ocean platform is prepared by the following chemical compositions in percent by weight: not higher than 0.18 percent of C, 0-0.15 to 0.35 percent of Si, 0.95 to 1.30 percent of Mn, not higher than 0.035 percent of P, not higher than 0.01 percent of S, 1.20 to 1.50 percent of Ni, 1.00 to 1.50 percent of Cr, 0.4 to 0.6 percent of Mo, not higher than 0.05 percent of Nb, 0.03 to 0.08 percent of V, not higher than 0.020 percent of Ti, not higher than 0.003 percent of B, 0.020 to 0.085 percent of Alt, and the balance of Fe and inevitable impurities. The thickness of the easy-welding tempering high-strength steel plate for the ocean platform is from 60 to 100 mm. The easy-welding tempering high-strength steel plate for the ocean platform is prepared by the following method: smelting-vacuum decarburization-LF furnace refining-pouring-cleaning-heating-rolling-water cooling after rolling-tempering-inspection and storage. The easy-welding tempering high-strength steel plate for the ocean platform has an outstanding combination property, is used for engineering machinery, has high surplus amount of impact toughness, can be widely used for engineering supports and other projects needing high-strength steel plates, and has a great application prospect. The easy-welding tempering high-strength steel plate for the ocean platform has simplicity in rolling technology, wide scope of tempering technology and easiness in operation, and is suitable for the production of the steel plant.
Description
Technical field
The invention belongs to low-alloy high-strength welded construction steel making field, be specifically related to a kind of easy welding ocean platform with modified high strength A517GrQ Modified steel plate, also relate to simultaneously a kind of production method of this easy-weld hardening high-strength steel plate.
Background technology
Tradition quenched and tempered steel has the shortcomings such as the cost that high-carbon quantity, high alloy content and carbon equivalent high bring is higher, welding property is not satisfactory.The DILLMAX690 steel plate that domestic project machinery industry high-strength steel is produced from import such as U.S. A514Gr.B and German DILLINGER Iron And Steel Company mostly, C(0.18% in the DILLMAX690 steel plate that Germany DILLINGER Iron And Steel Company produces) content is higher, Cr(1.50%), Ni(1.80%) alloy content is higher, the steel plate cost value rises.Above-mentioned several import steel price is generally very high.
Along with presenting consumption in the construction machinery industry at home, high-strength steel increases gradually, domestic some other steel plate of this level of iron and steel manufacturer production, but because specification limit is narrower, all below 60mm, can't satisfy the growing slab market requirement.Winning right of speech aspect the production vessel steel production of deep-sea, consolidate brand advantage for Wugang significant.
Summary of the invention
For the problems referred to above, the object of the present invention is to provide a kind of lower carbon content and the easy welding ocean platform quenched and tempered high tensile strength plate of alloy content, greatly to reduce production costs.
In order to achieve the above object, technical program of the present invention lies in having adopted a kind of easy welding ocean platform quenched and tempered high tensile strength plate, chemical composition by following weight percentage forms: C≤0.18%, Si 0.15～0.35%, Mn 0.95～1.30%, P≤0.035%, S≤0.01%, Ni 1.20～1.50%, Cr 1.00～1.50%, Mo 0.4～0.6%, Nb≤0.05%, and V 0.03～0.08%, Ti≤0.020%, B≤0.003%, Alt 0.020%～0.085%, and surplus is Fe and inevitable impurity.Steel plate thickness of the present invention is 60～100mm.
It is the microalloy element complex intensifying that easy welding ocean platform of the present invention adopts Cr-Ni-Mo-B with quenched and tempered high tensile strength plate A517GrQ Modified steel plate, through rational thermal treatment process, obtain good obdurability coupling, do not reduce again the welding property of slab simultaneously.Carbon content is 0.05～0.18% among the present invention, the development of high-strength steel is the process that progressively reduces carbon content, the reduction of carbon content, be conducive to improve on the one hand the toughness of steel, can improve significantly on the other hand the welding property of steel, the large-scale steel structure members of the stressed complexity of the applicable more high tenacity of the present invention and welding property; Si content is between 0.15～0.35%, and Si mainly improves the intensity of steel with the solution strengthening form, but can not too high levels, in order to avoid reduce the toughness of steel; Mn content is chosen between 0.95～1.30%, Mn mainly plays solution strengthening and reduces transformation temperature and improve armor plate strength, and Mn can significantly improve the hardening capacity of steel, with the increase of Mn content, plasticity and the low-temperature impact toughness of steel plate slightly descend, and intensity significantly improves; Cr content 1.00～1.50%, Ni content 1.20～1.50%, Cr, Ni can increase austenite and cross cold energy power, reduce the transition temperature of martensite and bainite, promote martensitic formation, the carbide that forms of Cr and C wherein, in various carbide, the compound that itself and carbon form is the most tiny, and it can be evenly distributed in the steel, make fine microstructures and evenly distribution, therefore can improve significantly intensity and the low-temperature impact toughness of steel plate, Cr, Ni content is lower than external similar steel grade, has both satisfied steel plate obdurability demand, play again the saving alloy, reduce the effect of cost; Mo content≤0.4～0.6%, B content≤0.003%, an amount of Mo and B can significantly increase the hardening capacity of steel, postpone supercooled austenite to perlitic transformation, by the compound interpolation of Mo and B, after rolling, cools off fast through ACC again steel plate, substantially can eliminate the generation of ferrite and pearlite in the steel; Nb content≤0.05%, Nb is fairly obvious to Grain Refinement Effect, separates out by Nb in the operation of rolling (C, N) strain inducing to hinder deformation austenite recovery and recrystallization, make the rolling deformation austenite structure in non-recrystallization zone of finish rolling stage be transformed into tiny phase-change product during phase transformation through controlled rolling and controlled cooling again; V content≤0.08%, V have higher precipitation strength effect, are used for improving the intensity of steel; Titanium is strong solid N element, and tiny TiN particle can hinder the Austenite Grain Growth of steel when heating effectively, and can improve significantly the welding property of steel; Al content is 0.020～0.085%, is reductor common in the steel, and steel grade adds a small amount of Al, can crystal grain thinning, improve impelling strength, Al also has oxidation-resistance and erosion resistance, Al and Cr, Si share, and can significantly improve the temperature non-scale of steel and the ability of high-temperature corrosion resistance; P content≤0.020%, S content≤0.035% are in order to guarantee that steel is pure, in the quenching and tempering, high, and the higher impelling strength that affects steel plate of P content.
The present invention also aims to provide the production method of a kind of easily welding ocean platform with quenched and tempered high tensile strength plate, may further comprise the steps:
(1) smelting technology: adopt the 90T ultra-high power electric arc furnace to smelt, select the high-quality furnace charge, melting period is adopted large quantity of slag stream slag operation, vacuum decarburization, P Gao Shixian go to take off C behind the P, the characteristics that performance low temperature easily takes off S, slag free tapping, tapping process do not add any C of containing reductor; Then send into the refining of LF refining furnace, fast deoxidation, according to taking off the S situation, fine setting Mn, Mo, Nb, Ni, Cr, V(do not contain the C alloy) element, transfer Ti and B before the bull ladle;
(2) casting process: steel grade of the present invention adopts the die casting of 23.55T ingot shape to produce for guaranteeing the homogeneity of composition;
(3) steel ingot cleaning: for guaranteeing the surface quality of steel plate, steel ingot adopts the cogging secondary to become a useful person, and after the cogging, with flame gun upper and lower surface is cleared up, and removes the iron scale on surface;
(4) heating rolling technique:
Heating process: heating cycle is carried out according to II group steel heating process, and soaking time is by increasing by 2 hours with ingot shape II group steel, and guaranteeing homogeneous heating and to prevent coarse grains, can guarantee fully solid solution of alloying element sufficient heat-up time; Steel ingot heats at soaking pit, and 1220～1240 ℃ of Heating temperatures, rate of heating are below 1000 ℃≤100 ℃/h, do not limit more than 1000 ℃; Steel billet heats at continuous oven, 1200～1220 ℃ of Heating temperatures, rate of heating ﹥ 10min/cm;
Cooling control technology is pricked in control: adopt the two-stage controlled rolling to adopt, fs is the Ovshinsky recrystallize stage, in this one-phase more than 1000 ℃, austenite deformation and recrystallize carry out simultaneously, the tiny austenite grain that obtains because of recrystallize, to cause the refinement of ferrite crystal grain, this stage single pass draft 〉=10%, accumulative total draft 〉=50%; Subordinate phase is 880 ℃～930 ℃ of non-recrystallize stages of austenite, in this one-phase, austenite crystal is elongated, form high-density mechanical twin and deformed belt in the austenite of non-recrystallization in elongation, microalloy carbon, nitride are separated out because of deformation induced simultaneously, thereby increased ferritic nucleation site, refinement ferrite crystal grain, this stage accumulative total draft 〉=40%;
The essence of control cooling is cooled off fast to the non-recrystallization austenite exactly, forming core on austenite grain boundary and deformation bands even in the deformed austenite, impel and organize further refinement, impel deformed austenite to be transformed into martensite or bainite structure, keep as much as possible simultaneously dislocation and the distortion that forms in the operation of rolling, improve the obdurability of steel plate; Steel plate enters water temp more than 930 ℃, adopts suitable speed of cooling, guarantees leaving water temperature(LWT) below 750 ℃, guarantees that namely template is by having guaranteed the hot rolling microstructure preparation;
(5) modified inspection process:
Quenching technology is: quenching is that to organize abundant austenitizing, quenching temperature be 930～950 ℃ in order to make, and the time is 176min, selects water as heat-eliminating medium, can make the speed of cooling of steel plate greater than critical cooling velocity, thereby obtains martensitic stucture;
Tempering process is: pass through tempering after the quenching again, be transformed into comparatively stable tempered structure, eliminate simultaneously internal stress, tempering temperature is selected 580 ℃～670 ℃, and soaking time is 2.5～3.5min/mm, has good obdurability coupling after the tempering.
Adopt method of the present invention to produce and realized lower carbon content and the chemical composition design of alloy content, the heating of strict control strand, rolling and cooling parameter, steel plate is after modifier treatment, not only obtain every mechanical performance index of technical qualification requirements but also reduced production cost, obtained simultaneously more tiny weave construction and the welding property of Geng Jia; Specification limit is wide, and thickness 60～100mm is used for replacing imported product, fills up the domestic market blank, satisfies the demand that the home and abroad construction machinery industry constantly increases consumption.
The mechanical property of steel plate of the present invention reaches following requirement: yield strength 〉=690MPa after testing, tensile strength 790～930MPa, A 〉=14% ,-27 ℃ of AKV 〉=100J ,-37 ℃ of AKV 〉=100J.
Because steel of the present invention adopts electrosmelting, P, S content are low, and steel is pure, receives praises from customers; Steel of the present invention is few because of the bullion content that adds, and cost is low, has market competitiveness; Steel of the present invention adopts II type controlled rolling process, has solved the mill milling insufficient pressure and the coarse grains that causes is uneven, impelling strength reduces phenomenon, is fit to the low rolling pressure milling train of other steel mill and produces high-strength steel.The steel plate template that adopts method of the present invention to produce is good, and roughness reaches≤4mm/m, can reduce 50 yuan/tons of the making mangling expenses of making side.Because steel of the present invention has good over-all properties, be used at present engineering machinery, impelling strength has sizable rich amount, can be widely used in the project that engineering rack etc. needs high-strength plate, has great application prospect.Its rolling technology is simple, and the hardening and tempering process scope is wide, and easy handling is suitable for having the Steel Plant of quenching press to produce.Adopt steel replace imported steel of the present invention, manufactory such as manufacturing engineering machinery adopt quenching and tempering, high and adopt low alloy steel to compare, and can alleviate deadweight 10～50%, and can improve equipment performance and work-ing life, save simultaneously the energy, brought larger benefit therefore can for manufacturing and use department.
Embodiment
Embodiment 1
The hardening high-strength steel of the present embodiment by weight each composition of percentage composition consists of: C 0.14%, Si 0.27%, Mn 1.16%, P 0.015%, S 0.001 %, Mo 0.41%, Ni 1.2%, Cr 1.04%, Nb 0.024%, V 0.033%, B 0.002%, Ti 0.015%, Al 0.064%, surplus is Fe and inevitable impurity, rolls into the 88mm steel plate.
Its mechanical property: yield strength: 820MPa, tensile strength: 880MPa, A are that 20% ,-27 ℃ of ballistic work AKV(are vertical): 119,129,159J ,-37 ℃ of ballistic work AKV(are vertical): 131,126,100J.
Embodiment 2
The hardening high-strength steel of the present embodiment by weight each composition of percentage composition consists of: C 0.14%, Si 0.25%, Mn 1.15%, P 0.012%, S 0.002%, Mo 0.43%, Ni 1.25%, Cr 1.03%, Nb 0.027%, V 0.035%, B 0.0023%, Ti 0.019%, Al 0.050% surplus is Fe and inevitably is mingled with.Ceq is 0.56%, rolls into the 88mm steel plate.
Its mechanical property: yield strength: 825MPa, tensile strength: 895MPa, A are that 18% ,-27 ℃ of ballistic work AKV(are vertical): 199,199,180J ,-37 ℃ of ballistic work AKV(are vertical): 192,190,167J.
It should be noted last that: above embodiment is the unrestricted technical scheme of the present invention in order to explanation only, although with reference to above-described embodiment the present invention is had been described in detail, those of ordinary skill in the art is to be understood that, still can make amendment or be equal to replacement the present invention, and not breaking away from any modification or partial replacement of the spirit and scope of the present invention, it all should be encompassed in the middle of the claim scope of the present invention.
Claims (4)
1. one kind is easily welded the ocean platform quenched and tempered high tensile strength plate, it is characterized in that, described steel plate is comprised of the chemical composition of following weight percentage: C≤0.18%, Si 0.15%～0.35%, and Mn 0.95%～1.30%, P≤0.035%, S≤0.01%, Ni 1.20～1.50%, and Cr 1.00～1.50%, Mo 0.4～0.6%, Nb≤0.05%, and V 0.03～0.08%, Ti≤0.020%, B≤0.003%, Alt 0.020%～0.085%, and surplus is Fe and inevitable impurity.
2. easy welding ocean platform quenched and tempered high tensile strength plate according to claim 1 is characterized in that, described steel plate thickness is 60～100mm.
3. the production method of an easy welding ocean platform usefulness quenched and tempered high tensile strength plate as claimed in claim 1 is characterized in that, this production method may further comprise the steps:
(1) smelting technology: vacuum decarburization, P Gao Shixian go to take off C behind the P, and then slag free tapping sends into the refining of LF refining furnace, fast deoxidation, and according to taking off the S situation, fine setting Mn, Mo, Nb, Ni, Cr, V element are transferred Ti and B before the bull ladle;
(2) casting process: adopt the die casting of 23.55T ingot shape to produce;
(3) steel ingot cleaning: steel ingot adopts the cogging secondary to become a useful person, and after the cogging, with flame gun upper and lower surface is cleared up;
(4) heating rolling technique:
Heating process: steel ingot heats at soaking pit, 1220～1240 ℃ of Heating temperatures, and rate of heating: below 1000 ℃≤and 100 ℃/h, do not limit more than 1000 ℃; Steel billet heats at continuous oven, 1200～1220 ℃ of Heating temperatures, rate of heating ﹥ 10min/cm;
(5) modified inspection process: quenching temperature is 930～950 ℃, and the time is 176min, selects water as heat-eliminating medium; Pass through tempering after the quenching, tempering temperature is 580～670 ℃ again, and soaking time is 2.5～3.5min/mm, and inspection by sampling obtains qualified finished product.
4. easy welding ocean platform according to claim 3 is with the production method of quenched and tempered high tensile strength plate, it is characterized in that, cooling control technology is pricked in control in the described step (4): adopt the two-stage controlled rolling, fs is the Ovshinsky recrystallize stage, this one-phase is interior more than 1000 ℃, this stage single pass draft 〉=10%, accumulative total draft 〉=50%; Subordinate phase is 880 ℃～930 ℃ of non-recrystallize stages of austenite, this stage accumulative total draft 〉=40%; Steel plate enters water temp more than 930 ℃, guarantees that leaving water temperature(LWT) is below 750 ℃.
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103114186A (en) * | 2013-03-15 | 2013-05-22 | 济钢集团有限公司 | Control cooling method of easy-welding high-performance steel plate |
| CN103938110A (en) * | 2014-04-28 | 2014-07-23 | 江苏沙钢集团有限公司 | FQ70-level ultrahigh-strength extra-thickness steel plate for ocean engineering and manufacturing method thereof |
| CN106498277A (en) * | 2016-09-20 | 2017-03-15 | 舞阳钢铁有限责任公司 | A kind of special thickness high-strength and high-ductility engineering machinery modulation steel plate and production method |
| CN106521359A (en) * | 2016-10-31 | 2017-03-22 | 舞阳钢铁有限责任公司 | Hydrogen sulfide corrosion resistant hardened and tempered high-strength steel plate for offshore drilling platform and producing method for hydrogen sulfide corrosion resistant hardened and tempered high-strength steel plate |
| CN107699819A (en) * | 2017-09-01 | 2018-02-16 | 舞阳钢铁有限责任公司 | Nuclear power generating equipment high intensity soft 15MnNi steel plates and its production method |
| CN111041329A (en) * | 2019-12-25 | 2020-04-21 | 舞阳钢铁有限责任公司 | High-strength high-toughness steel plate for ocean engineering and production method thereof |
| CN111826586A (en) * | 2020-06-15 | 2020-10-27 | 舞阳钢铁有限责任公司 | Low-cost large-thickness rack steel and production method thereof |
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| CN101709432A (en) * | 2009-12-26 | 2010-05-19 | 舞阳钢铁有限责任公司 | Steel for large-thickness hardening and tampering ocean platform and production method thereof |
| CN102605280A (en) * | 2012-03-15 | 2012-07-25 | 宝山钢铁股份有限公司 | Ultra-thick high-strength high low-temperature toughness steel plates for ocean platforms and production method thereof |
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Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103114186A (en) * | 2013-03-15 | 2013-05-22 | 济钢集团有限公司 | Control cooling method of easy-welding high-performance steel plate |
| CN103114186B (en) * | 2013-03-15 | 2015-04-08 | 济钢集团有限公司 | Control cooling method of easy-welding high-performance steel plate |
| CN103938110A (en) * | 2014-04-28 | 2014-07-23 | 江苏沙钢集团有限公司 | FQ70-level ultrahigh-strength extra-thickness steel plate for ocean engineering and manufacturing method thereof |
| CN106498277A (en) * | 2016-09-20 | 2017-03-15 | 舞阳钢铁有限责任公司 | A kind of special thickness high-strength and high-ductility engineering machinery modulation steel plate and production method |
| CN106498277B (en) * | 2016-09-20 | 2018-02-23 | 舞阳钢铁有限责任公司 | A kind of special thick high-strength and high-ductility engineering machinery modulation steel plate and production method |
| CN106521359A (en) * | 2016-10-31 | 2017-03-22 | 舞阳钢铁有限责任公司 | Hydrogen sulfide corrosion resistant hardened and tempered high-strength steel plate for offshore drilling platform and producing method for hydrogen sulfide corrosion resistant hardened and tempered high-strength steel plate |
| CN107699819A (en) * | 2017-09-01 | 2018-02-16 | 舞阳钢铁有限责任公司 | Nuclear power generating equipment high intensity soft 15MnNi steel plates and its production method |
| CN111041329A (en) * | 2019-12-25 | 2020-04-21 | 舞阳钢铁有限责任公司 | High-strength high-toughness steel plate for ocean engineering and production method thereof |
| CN111041329B (en) * | 2019-12-25 | 2021-11-12 | 舞阳钢铁有限责任公司 | High-strength high-toughness steel plate for ocean engineering and production method thereof |
| CN111826586A (en) * | 2020-06-15 | 2020-10-27 | 舞阳钢铁有限责任公司 | Low-cost large-thickness rack steel and production method thereof |
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