CN102605280A - Ultra-thick high-strength high low-temperature toughness steel plates for ocean platforms and production method thereof - Google Patents
Ultra-thick high-strength high low-temperature toughness steel plates for ocean platforms and production method thereof Download PDFInfo
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Abstract
Disclosed are ultra-thick high-strength high low-temperature toughness steel plates for ocean platforms and a production method thereof. The steel plates comprise, in weight percentage, 0.10-0.24% of C, 0.05-0.35% of Si, 0.60-1.15% of Mn, not more than 0.015% of P, not more than 0.005% of S, 0.01-0.030% of Ti, 1.45-1.75% of Cr, 0.15-0.44% of Mo, 0.80-2.50% of Ni, 0.010-0.070% of Nb, 0.020-0.080% of V, 0.02-0.06% of Alt, 0.001-0.004% of Ca, not more than 0.006% of N, 0.0007-0.0030% of B, the balance of F3 and unavoidable impurities. The steel plates have a system of C, Ni-Cr-Mo alloyed and Nb-V-Ti microalloyed, and have yield strength not smaller than 690MPa, tensile strength not smaller than 770MPa, -40 DEG C Charpy V-notch impact work no smaller than 69J, NDT (non-destructive testing) not larger than -35 DEG C, Z not smaller than 35%, and largest thickness more than 200mm. The steel plates are applicable to production of racks for ocean platforms.
Description
Technical field
The present invention relates to low-alloy quenched and tempered steel and make the field; Be particularly related to ocean platform with good low-temperature flexibility steel plate of special thick HS and method of manufacture thereof; Its ys>=690MPa, tensile strength>=770MPa ,-40 ℃ of summers, maximum ga(u)ge reached more than the 200mm than v-notch ballistic work>=69J, NDT≤-35 ℃, Z>=35%.
Background technology
In recent years; The fast development of world economy has aggravated the consumption of the energy; The exploitation of oil and gas equal energy source is extended to coastal waters, deep-sea by land gradually, as the indispensable device of marine energy source exploitation---and ocean platform has obtained development fast, has also promoted the continuous progress of ocean platform with steel.
Ocean platform is on the basis of hull structural steel, to grow up with steel, and the initial steel platform of building all is to use hull structural steel.Flourish along with progress of science and technology and exploitation marine cause, the quantity that ocean platform is built constantly increases, and type is also increasing; Energy extraction is developed to the deep-sea by the shallow sea simultaneously, to the development of low temperature marine site, so ocean platform will stand the attack of various weather condition and stormy waves, stands the corrosion of seawater by warm marine site, and working conditions is very harsh; In addition; The The Enlargement Tendency of ocean platform is also very remarkable; Complex structure, the welding job amount is big, and stress concentration degree is high; Therefore ocean platform has been proposed the harsh requirement of big thickness, HS, H.T., weldability and good corrosion resistance with steel, especially also proposed Z to performance requriements for some key members.
In recent years, by extensive employing, EH36 with this realization of base steel production domesticization, accounts for platform steel using amount 90% with lower platform to homemade ocean platform with steel plate.But along with ocean platform is tending towards maximizing, the development of deep waterization, the intensity rank of hull structural steel has satisfied not the performance requriements of some key positions, for the steel plate of HS, big thickness dependence on import still.
The highest steel grade of intensity rank that in SEP, uses at present---690MPa grade high-strength, H.T., ocean platform corrosion-resistant, that be prone to welding have only Japan, some producers of Germany to produce with steel, serious restriction the development of oceanographic engineering equipment of China.Therefore, be necessary to develop to this type of steel grade.
Chinese patent CN1281906 discloses the mooring chain steel and the production technique thereof of a kind of HS, H.T., good corrosion resistance; This steel grade adopts higher C, high Mn; The composition design method of Ni, Cr, Mo alloying and Nb microalloying, carbon equivalent (CE (IIW)=C+Mn/6+ (Cr+Mo+V)/5+ (Ni+Cu)/15) reaches more than 1.40%; Processing route through EAF+LF+VD+CCM manufactures mooring chain steel, can be used for the R4 level mooring chain of semi-submersible rig, swinging mooring's structure and floating production storage unit and other ocean exploitation facility, also can be used for the higher ship anchor chains of ask for something.But; This mooring chain steel is a bar; Its C, Mn content, tensile strength all do not meet relevant criterion, the code requirement of ocean platform with the tooth bar steel, and carbon equivalent＞1.4%, and too high carbon equivalent causes its welding property relatively poor; Welding heat influence area toughness is not enough, can not weld use as the spud leg material of large ocean platform structure load-bearing.
Chinese patent CN 1908217 has proposed a kind of marine drilling, production and the processing platform method of manufacture with Seawate-corrosive-resisting steel.This steel grade mainly adopts low-carbon (LC); The composition design method of Cu, Cr alloying and Nb microalloying; Through operations such as desulfurization, blowing, vacuum-treat, continuous casting and hot rollings, to make ocean platform and use Seawate-corrosive-resisting steel, the steel grade ys rank of manufacturing is at 440MPa and following.But this Seawate-corrosive-resisting steel; Its C, Cr content, ys, tensile strength all do not meet relevant criterion, the code requirement of ocean platform with the tooth bar steel; And its steel plate thickness has only 20mm thick, can not use as the spud leg material of large ocean platform structure load-bearing.
U.S. Pat 4428781A has proposed a kind of marine drilling platform mooring chain with having the method for manufacture of good weldability, hardenability low alloy steel.Through low-carbon (LC), high Si; The composition design method of Ni, Cr, Mo alloying and Nb, V, Ti microalloying, the steel grade ys of manufacturing is more than 600MPa, and tensile strength is more than 900MPa;-20 ℃ of notch shock toughness have good weldability and hardenability more than 40J.This steel grade air cooling or be cooled to room temperature after 800～1000 ℃ of normalizing treatment through after 680～790 ℃ of anneal, can be made the anchor chain that is used for fixing ocean platform again.
But; The same with aforementioned patent; This anchor chain uses steel to be bar; Its C, Cr, Ni content all do not meet relevant criterion, the code requirement of ocean platform with the tooth bar steel, and its low-temperature impact toughness can not satisfy ocean platform with the requirement of tooth bar steel relevant criterion, can not use as the spud leg material of large ocean platform structure load-bearing.
Summary of the invention
The object of the present invention is to provide a kind of ocean platform with good low-temperature flexibility steel plate of special thick HS and method of manufacture thereof; C, Ni-Cr-Mo alloying and Nb-V-Ti microalloying composition system in the employing; Ys>=690MPa, tensile strength>=770MPa ,-40 ℃ of summers are than v-notch ballistic work>=69J, NDT≤-35 ℃, Z>=35%; Maximum ga(u)ge reaches more than the 200mm, can be used for making ocean platform and uses tooth bar.
For achieving the above object, technical scheme of the present invention is:
Ocean platform is with the good low-temperature flexibility steel plate of special thick HS, and its composition weight percent is: C0.10～0.24%, and Si 0.05～0.35%, and Mn 0.60～1.15%; P≤0.015%, S≤0.005%, Ti 0.01～0.030%, and Cr 1.45～1.75%; Mo 0.15～0.44%, and Ni 0.80～2.50%, Nb0.010～0.070%; V 0.020～0.080%, and Alt 0.02～0.06%, and Ca 0.001～0.004%; N≤0.006%, B 0.0007～0.0030%, and all the other are Fe and inevitable impurity.
In ocean platform of the present invention designs with the good low-temperature flexibility steel plate of special thick HS composition:
C: the most basic strengthening element.Carbon dissolution forms interstitial solid solution in steel, play solution strengthening, forms carbide with the strong carbide forming element and separates out, and then plays the effect of precipitation strength.But too high C is unfavorable to ductility, toughness and the welding property of steel, reduces the solid solution of micro alloying elements such as Nb, V simultaneously, influences precipitating reinforcing effect; For need carry out modified heat treated steel grade, the amount of carbide minimizing after thermal treatment when C content is too low, precipitating reinforcing effect is not obvious, has reduced the intensity of steel.So C is controlled at 0.10%～0.24%.
Mn: be the most basic alloying element of low-alloy high-strength steel kind, through the intensity of solution strengthening raising steel, to cause loss of strength because of C content reduces in the compensation steel.Mn still enlarges the element of γ phase region, can reduce the γ → α transformation temperature of steel, helps to obtain tiny phase-change product, can improve the toughness of steel.But when Mn content is too high, for the steel grade of the thick specification of spy, be prone to produce segregation, lower the low-temperature flexibility in centre in the steel plate central position.Therefore this steel grade Mn content is 0.60%～1.15%.
S, P: inevitable detrimental impurity element in the steel, defective such as be prone to form segregation, be mingled with, worsen welding property, impelling strength and the anti-HIC performance of pipe line steel.Therefore, control P≤0.015, S≤0.005 among the present invention, and must be through Ca handle clip foreign material modification technology, make the inclusion morphology nodularization and be evenly distributed, reduce it toughness and corrupting influence.
Nb: in micro-alloyed steel, improve the effective elements of recrystallize final temperature, can effectively reduce mill load, fairly obvious to the effect of grain refining.For the invention steel, rolling deformation is accomplished at the recrystallize rolling sequence, separates out through strain inducing at this stage Nb and hinders the austenitic answer of deformation, recrystallize, plays the effect of refining grain size.In follow-up quenching reheat process,, obtain the reheat austenite crystal of refinement like this, help the refinement quenching structure because the forming core point increases; In drawing process, the Nb of solid solution separates out with the form disperse of NbC, improves intensity and does not lose toughness.But receive the restriction of C content and the influence of Heating temperature, too high Nb can't solid solution, same performance not effect and increase cost, so Nb content is controlled at 0.01%～0.07% among the present invention.
Ti: be strong solid N element, the stoichiometric ratio of Ti/N is 3.42, utilizes the Ti fixing N below the 60ppm in the steel just about 0.02%, when sheet billet continuous casting, can form the TiN precipitated phase of tiny high-temperature stable.Austenite crystal when this tiny TiN particle can hinder the slab reheat is effectively grown up, and helps to improve the solid solubility of Nb in austenite.For super-thick steel plate, an amount of Ti content helps forming stable TiN particle, when welding, plays and suppresses the heat affected zone grain growth, improves the effect of the impelling strength of welded heat affecting zone.Ti content is limited to 0.010～0.030% among the present invention.
V:V is through forming VN or the fine precipitation particles of V (CN) with C and N, and the reinforcement of steel is contributed.Simultaneously, V helps improving the stability of modified back hardness.But too high like content, then cost increases significantly.So its content is controlled at 0.02%～0.08%.
Cr: therefore the important element of the hardening capacity of raising steel needs to add higher Cr and improves hardening capacity to remedy the loss of strength that thickness brings, the homogeneity of performance on the improved strength thickness direction of raising steel for the steel plate of the thick specification of spy.And Cr content forms one deck fine and close Fe, Cr spinel result at surface of steel plate 1.45% when above in the heat treatment process, stops matrix directly to contact with environment, plays the seawater corrosion resistance effect that improves steel; But too high chromium and manganese add in the steel simultaneously, can cause lower melting point Cr-Mn composite oxides to form, and in hot procedure, form surface crack, simultaneously can the severe exacerbation welding property.Therefore Cr content should be limited to 1.45%～1.75% among the present invention.
Mo: improve the element of hardening capacity, effect is only second to Mn, therefore can effectively improve intensity; Add a spot of Mo in this external low alloy steel and can also play the temper brittleness that overcomes in the heat treatment process, improve the effect of heat treatment performance, fatigue property.In high-strength low-alloy steel, ys improves with the increase of Mo content, and therefore too high Mo diminishes plasticity.Mo content is controlled at 0.15%～0.44% among the present invention.
Ni: improve material at low temperature flexible element.Add an amount of Ni element, reduce the crystalline stacking fault energy, help the sliding motion of dislocation, improve the impelling strength of material, especially the impelling strength in special heavy plate centre.But when Ni content was too high, steel slab surface was prone to generate the higher iron scale of stickiness, was difficult to remove, and influenced the surface quality and the fatigue property of steel plate; Simultaneously too high Ni content is unfavorable for the welding of special heavy plate.Therefore to limit Ni content be 0.80～2.50% in the present invention.
Alt: be the element that adds for deoxidation in the steel, after the deoxidation fully, reduce the O content in the material, improve aging performance; In addition, an amount of Al helps crystal grain thinning, improves the toughness and tenacity of steel.Limiting Al content among the present invention is 0.02～0.06%.
Ca: handle the form that to control sulfide through Ca; Improve the anisotropy of steel plate, improve low-temperature flexibility, its content is less than at 0.001 o'clock does not have effect; Surpass 0.006 and then can produce many CaO, CaS; And form large-scale inclusion, the toughness of steel is caused damage, even influence the welding property of steel.So regulation Ca content range is 0.001%-0.004%
Ocean platform of the present invention is with the method for manufacture of the good low-temperature flexibility steel plate of special thick HS, and it comprises the steps:
1) smelts, casts
Ocean platform is with the good low-temperature flexibility steel plate of special thick HS, and its composition weight percent is:
C 0.10～0.24%, and Si 0.05～0.35%, and Mn 0.60～1.15%, P≤0.015%; S≤0.005%, Ti 0.01～0.030%, and Cr 1.45～1.75%, and Mo 0.15～0.44%; Ni0.80～2.50%, Nb 0.010～0.070%, and V 0.020～0.080%, and Alt 0.02～0.06%; Ca 0.001～0.004%, N≤0.006%, and B 0.0007～0.0030%, and all the other are Fe and inevitable impurity; Adopt electric furnace or converter smelting, external refining: RH vacuum outgas+LF desulfurization, and be cast into slab;
2) split rolling method
1150～1300 ℃ of slab heating temperatures, 900～1100 ℃ of finishing temperatures are rolled postcooling,
The hole is as cold as below 400 ℃;
3) stress-removal annealing process
The stress-removal annealing temperature: 450～600 ℃, and below the furnace cooling to 200 ℃;
4) heavy plate rolling
Slab reheat temperature: 1050～1200 ℃, 900～1000 ℃ of finishing temperatures are rolled postcooling,
The hole is as cold as below 400 ℃;
5) the modified thermal treatment of quenching+tempering
900～980 ℃ of quenching temperatures, shrend; 580～680 ℃ of tempering Heating temperatures.
Adopt above-mentioned composition technology, the steel that has guaranteed the different thickness specification has tempered sorbite+martensitic stucture through after modified, and this tissue has guaranteed HS, good low-temperature flexibility.
CN1281906 compares with Chinese patent, and the present invention is applied in the position difference of ocean platform, and the performance that therefore requires also is inequality, and Chinese patent CN1281906 more pays attention to the intensity and the extension property of material itself.Simultaneously, the form of product is different, and the product that this patent is produced is a long material, is different on product form with the sheet material that the present invention is produced.And the present invention is different with the composition design of Chinese patent CN1281906.
Compare with Chinese patent CN 1908217; Carbon during the present invention adopts; The composition design method of Cu, Ni, Cr, Mo alloying and Nb, V, Ti microalloying; And through operations such as LF+RH refinings, die casting, cogging, stress-removal thermal treatment, surface treatment, heavy plate rolling, modified thermal treatment, make the steel plate maximum ga(u)ge can arrive 200mm and more than, the ys rank reaches more than 690MPa reaches simultaneously.There is notable difference in the composition design and processes path of two patents.The composition design method and the strength grade of two steel grades are inconsistent.
4428781A compares with U.S. Pat, and what the present invention adopted is the composition design method of middle carbon, low Si and alloying, and alloy content significantly is lower than the contrast patent, but the armor plate strength of making is superior to the contrast patent, ys reach 690MPa and more than.Invention steel of the present invention is mainly used in the key structure position of lifting platform, the maximum ga(u)ge rank reach 200mm and more than.There are notable difference in the composition design method and the Application Areas of two steel grades.
Can find through above-mentioned contrast; Steel of the present invention has adopted economical composition method of design and ME; Can produce have high intensity, the special thick specification ocean platform of good low-temperature impact toughness and good weldability (low Ceq and Pcm index) uses steel plate, exist than big difference on composition design, technological design or Application Areas with existing patent.
Beneficial effect of the present invention
(1) the present invention can make HS, the H.T. special thick steel plates of maximum ga(u)ge size more than 200mm.
(2) mechanical property: ys:>=690MPa; Tensile strength:>=770MPa; Low-temperature impact toughness :-40 ℃ of following AKv>=69J; NDT :≤-35 ℃; Z is to performance (relative reduction in area): Z>=35%.
(3) steel of the present invention has appropriate C eq and Pcm index, and welding property is good, but and has a cutting property preferably.
(4) steel of the present invention can be used for making the ocean platform up-down with key parts such as tooth bar, jackets.
Embodiment
Below in conjunction with embodiment the present invention is further specified.
The concrete Chemical Composition of the embodiment of the invention is seen table 1.
Table 1 embodiment alloying constituent (wt.%)
Embodiment 1,7
Being used to make the thickness specification is the 40.0mm Plate Steel.
1. smelt, casting, RH and LF smelt;
2. breaking down cogging, breaking down cogging Heating temperature: 1270 ℃; Breaking down split rolling method finishing temperature: 980 ℃; Breaking down hole slow cooling goes out to cheat temperature: 300 ℃; Stress-removal annealing temperature: 500 ℃; Stress-removal annealing soaking time: 11 hours;
3. rolling, heavy plate rolling Heating temperature: 1090 ℃; Heavy plate rolling finishing temperature: 930 ℃; Heavy plate rolling hole slow cooling goes out 150 ℃ of cold temperature;
4. thermal treatment, quenching temperature: 975 ℃; Tempering Heating temperature: 660 ℃.
Embodiment 2,3:
1. being used to make the thickness specification is the 200.0mm Plate Steel.
2. smelt, casting, RH and LF smelt;
3. breaking down cogging, breaking down cogging Heating temperature: 1290 ℃; Breaking down split rolling method finishing temperature: 930 ℃; Breaking down hole slow cooling goes out to cheat temperature: 350 ℃; Stress-removal annealing temperature: 550 ℃;
4. rolling, heavy plate rolling Heating temperature: 1100 ℃; Heavy plate rolling finishing temperature: 940 ℃; Heavy plate rolling hole slow cooling goes out to cheat 200 ℃ of temperature;
5. thermal treatment, quenching temperature: 935 ℃; Tempering Heating temperature: 650 ℃.
Embodiment 4,8
Being used to make the thickness specification is the 127.0mm Plate Steel.
1. smelt, casting, RH and LF smelt;
2. breaking down cogging, breaking down cogging Heating temperature: 1280 ℃; Breaking down split rolling method finishing temperature: 1030 ℃; Breaking down hole slow cooling goes out to cheat temperature: 250 ℃; Stress-removal annealing temperature: 580 ℃;
3. rolling, heavy plate rolling Heating temperature: 1170 ℃; Heavy plate rolling finishing temperature: 920 ℃; Heavy plate rolling hole slow cooling goes out to cheat 100 ℃ of temperature.
4. thermal treatment, quenching temperature: 975 ℃; Tempering Heating temperature: 620 ℃.
Embodiment 5,6
Being used to make the thickness specification is the 152.0mm Plate Steel.
1. smelt, cast, RH and LF smelt;
2. breaking down cogging, breaking down cogging Heating temperature: 1250 ℃; Breaking down split rolling method finishing temperature: 900 ℃; Breaking down hole slow cooling goes out to cheat temperature: 400 ℃; Stress-removal annealing temperature: 570 ℃;
3. rolling, heavy plate rolling Heating temperature: 1150 ℃; 990 ℃ of heavy plate rolling finishing temperatures; Heavy plate rolling hole slow cooling goes out to cheat 380 ℃ of temperature;
4. thermal treatment, quenching temperature: 920 ℃; Tempering Heating temperature: 590 ℃;
Adopt above-mentioned different implementing process to be rolled; And to production board carry out bar-shaped stretching
, the full-scale summer, to checks such as performances, the results of property that obtains was as shown in table 2 than impact, nil-ductility temperature (NDT), Z.
Table 2
Annotate: contrast patent 1-Chinese patent CN1281906, contrast patent 2-Chinese patent CN 1908217, contrast patent 3-U.S. Pat 4428781A.
It is thus clear that, to compare with the contrast patent, the ocean platform that adopts manufacturing of the present invention has HS, H.T., good moulding and Z to performance with steel, has suitable carbon equivalent simultaneously, has weldability, excellent combination property preferably.The present invention adopts appropriate ingredients technology, can produce the maximum ga(u)ge specification and use Plate Steel at the ocean platform of 200mm and above specification.The Plate Steel that the present invention produces can be used for making ocean platform with key members such as lifter rack, jacket and spud legs, and it is current to the growth requirement of oceanographic engineering equipment with steel to meet China, has broad application prospects.
Claims (2)
1. ocean platform is with the good low-temperature flexibility steel plate of special thick HS, and its composition weight percent is: C0.10～0.24%, and Si 0.05～0.35%, and Mn 0.60～1.15%; P≤0.015%, S≤0.005%, Ti 0.01～0.030%, and Cr 1.45～1.75%; Mo 0.15～0.44%, and Ni 0.80～2.50%, Nb0.010～0.070%; V 0.020～0.080%, and Alt 0.02～0.06%, and Ca 0.001～0.004%; N≤0.006%, B 0.0007～0.0030%, and all the other are Fe and inevitable impurity.
2. ocean platform is with the method for manufacture of the good low-temperature flexibility steel plate of special thick HS, and it comprises the steps:
1) smelts, casts
Ocean platform is with the good low-temperature flexibility steel plate of special thick HS, and its composition weight percent is: C 0.10～0.24%, and Si 0.05～0.35%, and Mn 0.60～1.15%; P≤0.015%, S≤0.005%, Ti 0.01～0.030%, and Cr 1.45～1.75%; Mo 0.15～0.44%, Ni0.80～2.50%, and Nb 0.010～0.070%; V 0.020～0.080%, and Alt 0.02～0.06%, and Ca 0.001～0.004%; N≤0.006%, B 0.0007～0.0030%, and all the other are Fe and inevitable impurity; Adopt electric furnace or converter smelting, external refining: RH vacuum outgas+LF desulfurization, and be cast into slab;
2) split rolling method
1150～1300 ℃ of slab heating temperatures, 900～1100 ℃ of finishing temperatures are rolled postcooling,
Cheat cold or below the cooling in heap to 400 ℃;
3) stress-removal annealing process
The stress-removal annealing temperature: 450～600 ℃, and below the furnace cooling to 200 ℃;
4) heavy plate rolling
Slab reheat temperature: 1050～1200 ℃, 900～1000 ℃ of finishing temperatures are rolled postcooling,
The hole is as cold as below 400 ℃;
5) the modified thermal treatment of quenching+tempering
900～980 ℃ of quenching temperatures, shrend; 580～680 ℃ of tempering Heating temperatures.
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Application publication date: 20120725 |