CN103243261B - Fire-resistant steel of ocean platform with excellent anti-fatigue performance and production method thereof - Google Patents
Fire-resistant steel of ocean platform with excellent anti-fatigue performance and production method thereof Download PDFInfo
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Abstract
The invention discloses a fire-resistant steel of an ocean platform with excellent anti-fatigue performance. The fire-resistant steel comprises the chemical ingredients by weight percent: 0.10-0.30% of C, 0.05-0.25% of Si, no more than 0.20% of Mn, no more than 0.018% of P, no more than 0.008% of Si, no more than 0.18% of Al, 0.25-0.80% of Mo, and 0.05-0.25% of Co. The method comprises the production steps of: smelting by a converter, slagging, rolling, standing for 15-150 seconds on a roller bed; water-cooling, and naturally cooling to room temperature. The steel disclosed by the invention is excellent in anti-wave fatigue strength performance; the three-point bending fatigue number achieves 1500-2000 thousands; the yield strength Re at a high temperature of 800 DEG C is not less than 80% of yield strength at room temperature; the lasting time is 5.0-7.0 hours; the room temperature yield strength is 325-695 MPa; the service life of the steel structure can be ensured; and the marine ecological risk is reduced.
Description
Technical field
The present invention relates to a kind of marine drilling platform fire resisting construction steel and manufacture method thereof, belong to low-carbon and low-alloy high-strength steel and manufacture field, specifically belong to a kind of wind and wave resistance fatigue property excellent for building fire-resistant steel grade and the production method thereof such as fixed, semisubmersible, self-lifting type marine drilling platform, large-scale ocean petroleum transportation boats and ships.
Background technology
The resources such as exploiting ocean oil, Sweet natural gas and the large ocean engineering steel construction such as marine drilling platform built, long service is in ocean basin, regularly can not arrive land dock and carry out Maintenance and Repair, because ocean platform steel construction is in ocean stormy waves environment all the time, therefore steel wind and wave resistance fatigue property is required harsh, common structural steel can not meet the engineering requirements such as Offshore Platform because the wind and wave resistance fatigue property of common iron and resistance to elevated temperatures poor.In steel Particulate Inclusion as the size of MnS etc. and the wind and wave resistance Influence of Fatigue Properties of form to steel larger, MnS belongs to yielding being mingled with, in steel plate rolling process, deform along rolling direction, the flats forming area larger is mingled with, the associative key in steel between iron atom has been cut off in these large being mingled with, be partially formed tiny crack, because extraneous stormy waves ceaselessly acts on, expansion and fatigue crack growth will be there is in these crackles, if fatigue crack growth rate is very fast, the safety of the steel construction such as ocean platform will be affected, therefore, for the oceanographic engineering steel construction steel being uninterruptedly subject to wind wave action for a long time, the quantity that in need strict control steel, MnS etc. are mingled with and size.
In addition, marine drilling platform all with oil, Sweet natural gas etc. inflammable goods and materials closely related, once presence of fire, will cause the direct losses such as great life, property, marine ecology, indirect loss also comprises tourism, sea farming industry etc.Current technology can not meet modern Offshore Platform and build requirement because its high temperature resistant temperature lower (generally lower than 750 DEG C) and/or high temperature lower time length do not grow (being generally less than 3 hours).The object of the present invention is to provide a kind of marine drilling platform fire resisting construction steel and manufacture method thereof of wind and wave resistance excellent property, simulated wave load three-point bending times of fatigue reaches 150 ~ 2,000,000 times, and there is good fire performance, in 800 DEG C of environment, steel lower yield strength ReL is not less than 80% of room-temperature yield strength, 5.0 ~ 7.0 hours time length, for building the Steel Structure Works such as large ocean drilling unit.
Before the application, Chinese patent application CN201110355557.3 discloses " a kind of heavy thickness steel plate for ocean engineering and production method thereof ", steel plate is made up of the component of following weight percentage: C:0.07% ~ 0.09%, Si:0.15% ~ 0.40%, Mn:1.40% ~ 1.50%, P≤0.012%, S≤0.005%, Ni:0.60% ~ 0.70%, Nb:0.030% ~ 0.040%, Al:0.020% ~ 0.045%, Mo:0.13% ~ 0.17%, V:0.04% ~ 0.05%, Ti:0.012% ~ 0.020%, surplus is Fe and inevitable impurity.For iron based structure steel, its fire performance is main relevant with the chemical composition of steel, if contain enough high temperature alloy elements in steel as Mo, V, Cr, W, Co, Zr, and adopt suitable manufacture method, formed in structure iron high-temperature stable, particle is tiny, the second-phase of Dispersed precipitate, then this structure iron has fire performance, at high temperature has enough yield strengths, and this structure iron can be described as fire resisting construction steel.This patented technology deficiency is to the addition of more Mn in chemical composition, easy formation MnS is mingled with, reduce the wind and wave resistance fatigue property of steel, shorten the fatigue lifetime of steel construction, in addition, containing 0.60% ~ 0.70%Ni in steel, not only can not improve the fire performance of steel, also increase considerably production cost.
Another Chinese patent application CN201210348440.7 discloses patented technology " a kind of ultra-high-strength/tenacity steel plate for ocean engineering and production method thereof ", this steel plate chemical composition by weight percentage, C:0.06 ~ 0.10%, Si:0.20 ~ 0.40%, Mn:1.10 ~ 1.65%, P :≤0.010%, S :≤0.0020%, Nb:0.030 ~ 0.050%, V:0.020 ~ 0.060%, Ti:0.006 ~ 0.015%, Ni:0.60 ~ 1.30%, Cr:0.30 ~ 0.60%, Cu:0.20 ~ 0.60%, Mo:0.40 ~ 0.60%, Alt:0.020 ~ 0.040%, surplus is Fe and inevitable impurity.By converter smelting, rolling on stove volume reversable mill, by TMCP technique, finally carries out Tempering and Quenching.Plate property of the present invention is good, and tensile strength is 770 ~ 840MPa, and yield strength is 710 ~ 800MPa, and unit elongation is 16 ~ 19%, and-40 DEG C of low temperature transverse impacts and low temperature aging impact property >=90J, cold-bending property is qualified.The deficiency of this patented technology is the Cr that with the addition of 0.30 ~ 0.60% in steel, when envrionment temperature is higher than 600 DEG C, and the Cr that in Cr and steel, C is formed
2c
3, Cr
3c
7can gather rapidly grow up Deng series compound, lose symbiosis and epibiosis with matrix, form hole and become macrocrack, worsen wind and wave resistance fatigue property and the high-temperature yield strength of steel, in steel, Mn content is higher, easily forms MnS and is mingled with, reduce the wind and wave resistance fatigue lifetime of steel.It is very complicated that manufacture method " by TMCP technique, finally carries out Tempering and Quenching ", significantly increases production technique cost.
Chinese patent application CN201110359475.6 describes " a kind of ultrahigh-strength structural steel board for ocean engineering and production method thereof ", slab composition is: C0.05-0.13%, Si0.1-0.4%, Mn0.7-1.7%, Alt0.01-0.04%, Nb0.02-0.05%, V0-0.05%, Ti0.008-0.02%, Cr0-0.6%, Mo0.2-0.4%, Ni0.15-0.8%, Cu0-0.5%, B0-0.0011%, P < 0.01%, S < 0.005%, O < 0.0010%, N < 0.005%, H < 0.00015%, Nb+V+Ti≤0.12%, all the other are Fe and inevitable impurity.Different chemical compositions, rolling and heat treatment process parameter is adopted for different thickness specification.Production technique comprises desulfurizing iron, converter top and bottom complex blowing, vacuum-treat, continuous casting, controlled rolling and controlled cooling, quenching, tempering.This patented technology chemical composition is too complicated, Ti, Nb etc. of adding easily and N, C react form Ti (CN), Nb(CN) etc. be mingled with, the foreign matter of these angular shape significantly can reduce the wind and wave resistance fatigue property of steel, affect the safety of steel construction, even if the alloying elements such as Cr, Mo, V all adopt upper limit composition, also not there is fire performance, the steel construction building fire-resistant position can not be used for, and steel interalloy element Cr system carbide is at high temperature easily sharply grown up, lose High-Temperature Strengthening effect, reduce the high-temperature yield strength of steel.
Chinese patent application CN200810179362.6 describes " a kind of refractory steel and preparation method thereof ", this refractory steel of this patented technology comprises bainite and ferrite, wherein, with the cumulative volume of the metallographic structure construct of steel for benchmark, in this refractory steel, the percent by volume of bainite is 20-40%, and ferritic percent by volume is 60-80%; Described refractory steel contains following chemical composition: with the total amount of this refractory steel for benchmark, in simple substance, C:0.05-0.12 % by weight, Si:0.1-0.5 % by weight, Mn:0.3-1.6 % by weight, V:0.05-0.12 % by weight, Cr:0.1-0.6 % by weight, Mo:0.2-0.4 % by weight, B:0.0005-0.002 % by weight, N:0.003-0.015 % by weight, P≤0.02 % by weight, S≤0.01 % by weight, Fe:97.0-99.1 % by weight.This two patented technologies deficiency is the Cr that with the addition of 0.1-0.6 % by weight in steel, and under 800 DEG C of high temperature, the CrxCy series product that Cr and C reaction generates easily is grown up, violent wind and wave resistance fatigue lifetime of reducing steel, and loses high-temperature flame-proof performance.
Summary of the invention
The object of the present patent application is to solve the deficiencies in the prior art, a kind of marine drilling platform steel is provided, not only require that wind and wave resistance fatigue property is excellent, three-point bending times of fatigue reaches 150 ~ 2,000,000 times, 800 DEG C of yield strength ReL are not less than 80% of room-temperature yield strength, time length, room-temperature yield strength was marine drilling platform structure refractory steel and the production method of the wind and wave resistance excellent property of 325 ~ 695MPa at 5.0 ~ 7.0 hours.
Realize the measure of above-mentioned purpose:
The ocean platform refractory steel that anti-fatigue performance is excellent, its chemical composition and weight percent are: C:0.10% ~ 0.30%, Si:0.05% ~ 0.25%, Mn≤0.20%, P≤0.018%, S≤0.008%, Al≤0.18%, Mo:0.25% ~ 0.80%, Co:0.05 ~ 0.25%, surplus Fe and inevitable impurity.
The method of the marine drilling platform structure refractory steel of production wind and wave resistance excellent property, its step:
1) converter smelting, and conveniently measure Argon 1 ~ 8 minute;
2) in ladle furnace, add CaO according to 0.1 ~ 0.4 kg/tonne of steel and carry out slag making, and refining 15 ~ 60 minutes;
3) be rolled, control start rolling temperature at 990 DEG C ~ 1120 DEG C, finishing temperature control is at 890 DEG C ~ 960 DEG C;
4) finish to gauge terminates rear steel plate on roller-way, parks 15 ~ 150 seconds;
5) carry out water-cooled, control final cooling temperature at 200 DEG C ~ 700 DEG C;
6) room temperature is naturally cooled to.
Preferred: argon blowing time is 2.5 ~ 5.0 minutes.
Preferred: after finish to gauge, steel plate storage period on roller-way was 35 ~ 120 seconds.
Preferred: it is 200 ~ 600 DEG C that final cooling temperature controls.
The setting of main alloy element content of the present invention and and production method according to following principle:
In order to make structure iron still have desirable intensity in hot environment, will take measures to make steel microtexture at high temperature have certain stability.In steel, add the lower alloying element of rate of diffusion as Co, not only at high temperature rate of diffusion is slow for alloying element itself, suppresses the diffusion of Mn in steel, reduces the quantity that Mn and S reaction generation MnS is mingled with, improves the wind and wave resistance fatigue property of steel.Contain that other element is as the diffusion at high temperature such as Fe, C, Si in addition, under causing high temperature, ferrite still keeps certain solute atoms degree of supersaturation, due to the effect of solution strengthening, structure iron just has good intensity in hot environment, can ensure, at 800 DEG C, there is enough yield strengths, ensure the safety of steel construction, also can guarantee the time continuing 5 ~ 7 hours at 800 DEG C, win the longer time and save oneself and extraneous relief.In addition, add in steel appropriate can be formed precipitation strength, dispersion-strengthened alloying element as Mo etc., in steel manufacturing processed reaction generate high-temperature stable, particle is tiny, second-phase MoxCy, MoxOy etc. of being evenly distributed, atomic diffusion can be suppressed on the one hand, stabilized matrix, improves the hot strength of steel; On the other hand, can hinder the slippage of dislocation, dislocation needs when crossing these precipitated phases to increase energy and external load, macroscopically improves the hot strength of steel.
In manufacture method of the present invention, first molten steel carries out Argon 1 ~ 8 minute through the molten steel of converter smelting, and object is that in removing molten steel, slag, size to be oarse-grainedly mingled with as MnS, SiO higher than 5
2deng, reducing macrobead in steel is mingled with quantity, improves the wind and wave resistance fatigue property of steel.
Adopt ladle furnace to add CaO slag making concise 15 ~ 60 minutes, object is to reduce S content in steel, reduces the condition forming MnS and be mingled with.
Steel plate rolling process adopts stepless control rolling method, start rolling temperature 990 DEG C ~ 1120 DEG C, and object is that more than 990 DEG C of temperature can adopt the as-cast structure in the broken casting badly of the large pressure of high temperature, fining austenite grains size.The non-recrystallize critical temperature of steel austenite of the present invention is 970 DEG C, and by finishing temperature control 890 DEG C ~ 960 DEG C scopes, object is further crystal grain thinning below recrystallization temperature, and can be retained to room temperature.
After finish to gauge, steel plate parked for 15 ~ 150 seconds on roller-way, and object is that maintenance certain hour can eliminate the unrelieved stress in steel, is conducive to the wind and wave resistance fatigue property of steel, and makes precipitated phase MoxCy, MoxOy, CoC etc. of forming Dispersed precipitate in steel.
Water-cooled steel plate, object is that suppressing precipitated phase MoxCy, MoxOy, CoC to gather grows up, and avoids losing symbiosis and epibiosis with matrix, keeps strengthening effect.And final cooling temperature being controlled at 200 DEG C ~ 700 DEG C, object is to suppress phase-change product ferrite recrystallization, forms tiny ferrite crystal grain, makes steel of the present invention have good intensity and toughness coordinates and fatigue property.
Below sketch the reason of selected each alloying element and composition range in steel of the present invention.
C, setting range is 0.10% ~ 0.30%.Be solid-solution in the C atom in ferrite matrix, the yield strength of steel can be improved, the rate of diffusion that second-phase MoxCy, CoxCy etc. of generating can hinder dislocation is reacted with Mo, Co, improve wind and wave resistance fatigue property and the hot strength of steel, lower than 0.10%C, the C content required for solution strengthening can not be met, the C content required for second-phase MoxCy, CoxCy forming sufficient amount can not be met, C content higher than 0.30% easily makes the impelling strength of steel and fracture toughness property reduce, and easily make second-phase MoxCy, CoxCy of formation gather to grow up, lose strengthening effect.
Si, setting range is 0.05% ~ 0.25%.The Si added in steel can improve the yield strength of steel, and lower than 0.05%Si, strengthening effect is not remarkable, higher than 0.25%Si, easily generates SiO
2be mingled with, reduce the toughness of steel.
Mn, setting range Mn≤0.20%.The effect adding Mn is mainly the transformation temperature reducing steel, the tissue of needs can be obtained in the operation of rolling, the present invention sets Mn≤0.20%, object is that minimizing and S react and produces yielding MnS quantity, guarantee the fatigue property of steel, room-temperature property and high-temperature behavior, therefore alloying element Mn should not be added in high-temperature-resistant structure steel.
Al: the scope of setting is Al≤0.18%.The object of the invention is to add appropriate Al, adopt manufacture method provided by the invention, in steel, form Dispersed precipitate, tiny Al
2o
3particle, suppresses the diffusion of steel Atom on the one hand, improves the yield strength of steel; On the other hand, can effectively pin crystal boundary, produce grain refinement effect, improve wind and wave resistance fatigue property and the hot strength of steel, make steel of the present invention have certain heat resistance.But oarse-grained Al can be produced higher than the Al content of 0.18%
2o
3worsen the fatigue property of steel, room temperature strength and hot strength.
Mo: the scope set in steel of the present invention is 0.25% ~ 0.80%.Add Mo, the atomic diffusion such as Fe, C can be suppressed, stablize ferrite, on the other hand, the MoxCy that Mo and C reaction generates, can hinder dislocation moving effectively, improve room temperature strength and the hot strength of steel of the present invention, Mo significantly reduces the transformation temperature of structure iron, can obtain tiny crystal grain and tissue in the fabrication process, ensures wind and wave resistance fatigue lifetime.Mo content, lower than 0.25%, can not form desirable strengthening effect, and Mo content, higher than 0.80%, increases production cost, because Mo is costly alloying element.
Co: setting range is 0.05 ~ 0.25%, the present invention is characterized in the addition of appropriate Mo and Co in steel, and acting in conjunction improves the hot strength of steel, and Co at high temperature stability is higher, and rate of diffusion is lower, effectively can contain atomic diffusion.With C, remaining O react generate serial second-phase CoxCy, CoxOy etc. can pinning dislocation effectively, hinder dislocation migration, effectively improve the fire performance of steel of the present invention, can ensure, at 800 DEG C, there is enough yield strengths, ensure the safety of steel construction, also can guarantee the time continuing 5 ~ 7 hours at 800 DEG C, win the longer time and save oneself and extraneous relief.CoxCy, CoxOy series second-phase quantity that Co content lower than 0.05% is formed is inadequate, and High-Temperature Strengthening effect is not remarkable.Higher than the Co content of 0.25%, easily reduce the Toughness of steel, and add production cost.
P, S are impurity elements harmful in steel, and in steel, P easily forms segregation in steel, reduce the toughness of steel.In steel, S easily forms yielding MnS, FeS sulfides, sharply reduce fatigue property and the high-temperature behavior of steel, therefore P, S content is more low better, if but its content is limited too low, production difficulty can be increased, improve production cost, steel is obtained P, S content and be each defined in P≤0.018%, S≤0.008% scope.
Steel of the present invention is wind and wave resistance fatigue strength excellent property not only, wind and wave resistance fatigue property is excellent, three-point bending times of fatigue reaches 150 ~ 2,000,000 times, 800 DEG C of high temperature lower yield strength ReL are not less than 80% of room-temperature yield strength, time length was at 5.0 ~ 7.0 hours, room-temperature yield strength is the excellent fire-resistant steel of the wind and wave resistance excellent property opposing ocean stormy waves fatigue property of 325 ~ 695MPa, can ensure steel construction work-ing life, reduce marine ecology risk.
Embodiment
Below the present invention is described in detail:
Table 1 is the value list of various embodiments of the present invention and comparative example;
Table 2 is the main technologic parameters list of various embodiments of the present invention and comparative example;
Table 3 is various embodiments of the present invention and comparative example three-point bending fatigue lifetime, room-temperature yield strength and performance monitoring situation list at 800 DEG C;
Various embodiments of the present invention are produced according to following steps:
Its step:
1) converter smelting, and conveniently measure Argon 1 ~ 8 minute;
2) in ladle furnace, add CaO according to 0.1 ~ 0.4 kg/tonne of steel and carry out slag making, and refining 15 ~ 60 minutes;
3) be rolled, control start rolling temperature at 990 DEG C ~ 1120 DEG C, finishing temperature control is at 890 DEG C ~ 960 DEG C;
4) finish to gauge terminates rear steel plate on roller-way, parks 15 ~ 150 seconds;
5) carry out water-cooled, control final cooling temperature at 200 DEG C ~ 700 DEG C;
6) room temperature is naturally cooled to.
Various embodiments of the present invention are according to component requirements and following processing step, existing patent comparative steel before having smelted 7 batches of steel of the present invention and 2 crowdes of the application, tests the three-point bending fatigue lifetime of steel, room-temperature yield strength, 800 DEG C of lower yield strengths, 800 DEG C of environment time length.Simulated wave load fatigue three-point bending test process is as follows: steel test is processed into 30mm × 30mm × 1000mm square rod sample, two ends are fixing forms simply supported beam, sample central vertical is in ground applied load-release load, double vibrations, amplitude 100mm, vibrational frequency is 1 cycle per second, until sample fracture, and record double vibrations number of times.Visible, by the structure iron of present component and explained hereafter, there is excellent anti-fatigue performance, room temperature strength and hot strength, three-point bending times of fatigue reaches 150 ~ 2,000,000 times, the ratio of 800 DEG C of yield strength/room-temperature yield strength is all not less than 80%, 5.0 hours ~ 7.0 hours time length at 800 DEG C, show that steel of the present invention has excellent opposing ocean stormy waves fatigue property and better fire performance.
Not in composition of steel scope of the present invention or/and production technique not compared steel within the scope of the present invention, over-all properties is lower, under identical experiment condition, three-point bending times of fatigue only 20 ~ 500,000 times, the ratio of 800 DEG C of yield strength/room-temperature yield strength is all lower than 80%, and at 800 DEG C, the time length is the highest 0.2 hour, shows that the hot strength of comparative example's steel grade is lower, time length is short, and fire performance is poor.
Table 1. embodiment of the present invention and comparative steel chemical composition
The main technologic parameters of table 2. production embodiment of the present invention steel and comparative steel and performance
The behavior pattern of table 3 various embodiments of the present invention and comparative example
As can be seen from Table 3, three-point bending times of fatigue of the present invention, more than 1505466 times, even reaches 2000003 times, has excellent anti-ocean stormy waves fatigue property.800 DEG C of lower yield strengths are at least at more than 267MPa, and at 800 DEG C, the time length is at least at 5 hours.
Above-described embodiment is only the best and exemplifies, and is not the restriction to embodiments of the present invention.
Claims (4)
1. the ocean platform refractory steel that anti-fatigue performance is excellent, its chemical composition and weight percent are: C:0.10% ~ 0.30%, Si:0.05% ~ 0.25%, Mn≤0.11%, P≤0.018%, S≤0.008%, Al:0.134 ~ 0.18%, Mo:0.46% ~ 0.80%, Co:0.05 ~ 0.25%, surplus Fe and inevitable impurity.
2. the method for the ocean platform refractory steel that the anti-fatigue performance described in production claim 1 is excellent, its step:
1) converter smelting, and conveniently measure Argon 1 ~ 8 minute;
2) in ladle furnace, add CaO according to 0.1 ~ 0.4 kg/tonne of steel and carry out slag making, and refining 15 ~ 60 minutes;
3) be rolled, control start rolling temperature at 990 DEG C ~ 1120 DEG C, finishing temperature control is at 890 DEG C ~ 960 DEG C;
4) finish to gauge terminates rear steel plate on roller-way, parks 15 ~ 150 seconds;
5) carry out water-cooled, control final cooling temperature at 200 DEG C ~ 700 DEG C;
6) room temperature is naturally cooled to.
3. method of producing the excellent ocean platform refractory steel of anti-fatigue performance as claimed in claim 2, is characterized in that: argon blowing time is 2.5 ~ 5.0 minutes.
4. method of producing the excellent ocean platform refractory steel of anti-fatigue performance as claimed in claim 2, is characterized in that: after finish to gauge, steel plate storage period on roller-way was 35 ~ 120 seconds.
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| CN102703807A (en) * | 2012-06-25 | 2012-10-03 | 武汉钢铁(集团)公司 | Steel with minus 80-degree C impact absorbing energy no less than 100J for ocean engineering and production method thereof |
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| JPH0250912A (en) * | 1988-08-11 | 1990-02-20 | Nippon Steel Corp | Production of low alloy high tension seamless steel pipe having fine grained structure |
| JP4673822B2 (en) * | 2006-11-14 | 2011-04-20 | 新日本製鐵株式会社 | Refractory steel material excellent in toughness of welded joint and method for producing the same |
| KR20110120528A (en) * | 2010-04-29 | 2011-11-04 | 현대제철 주식회사 | Fire-resistant steel for construction having low yield ratio and method for production thereof |
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