CN102337460B - Ultrahigh-strength structural steel board for ocean engineering and production method thereof - Google Patents
Ultrahigh-strength structural steel board for ocean engineering and production method thereof Download PDFInfo
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Abstract
The invention relates to an ultrahigh-strength structural steel board for ocean engineering and a production method thereof, belonging to the technical field of ultrahigh-strength steel. A board blank comprises the following components: 0.05-0.13% of C, 0.1-0.4% of Si, 0.7-1.7% of Mn, 0.01-0.04% of Alt, 0.02-0.05% of Nb, 0-0.05% of V, 0.008-0.02% of Ti, 0-0.6% of Cr, 0.2-0.4% of Mo, 0.15-0.8% of Ni, 0-0.5% of Cu, 0-0.0011% of B, less than 0.01% of P, less than 0.005% of S, less than 0.0010% of O, less than 0.005% of N, less than 0.00015% of H, and the balance of Fe and inevitable impurities, wherein Nb+V+Ti is not more than 0.12%. Aiming at different thickness standards, different chemical component as well as rolling and heat treatment process parameters are adopted. The production process comprises the steps of molten iron desulfurization, converter top and bottom blowing, vacuum treatment, continuous casting, controlled rolling and controlled cooling, quenching and tempering. The steel board has the advantages that: the production cost is lower, and the comprehensive mechanical properties can meet the requirements of the steel for the ocean engineering for various mechanical properties.
Description
Technical field
The invention belongs to the ultrahigh-strength steel technical field, a kind of ultrahigh-strength structural steel board for ocean engineering and production method thereof particularly are provided, have the superstrength offshore engineering structure steel of good low-temperature flexibility, welding property and anti-lamellar tearing performance.
Background technology
Offshore engineering structure is the important ultra-large type welded steel structure of human development oceanic resources, is applied in the severe ocean Working environment such as wave, tide, storm and cold floating ice, supports platform and drilling outfit that gross weight surpasses hundreds of tons.These use characteristic have determined that the ocean offshore engineering structure must have high strength, high tenacity, antifatigue, anti-lamellar tearing, good weldability and good performance index such as cold-workability with steel.This uses work-ing life and the stand-alone development oceanic resources of steel significant for assurance away from the operator's on land life condition and safety, raising offshore engineering structure.
Along with the raising of marine oil and gas exploration and development technology, the marine oil and gas resource exploitation is expanded to deepwater field gradually, oil production equipment maximization, lightweight, long lifetime, removable be the inexorable trend of Future Development.Therefore, offshore engineering structure will be to future developments such as high strength, thick specification, good weldability and low-temperature flexibilities with steel tomorrow requirement direction.The above steel plate of target 100mm has been widely used in the spud leg tooth bar position of jack-up unit; And common 360MPa and 400MPa level offshore engineering structure also can not be satisfied the demand with steel, and yield strength 420～700MPa steel plate will become the direction of future development; The expanding day in ocean exploitation zone becomes more important the low-temperature flexibility of marine steel, for guaranteeing the platform personal security, " ocean platform rules " proposes to explicitly call for to different steel plate slab heart sections or 1/3 place's low-temperature impact work, E grade steel plate demand will significantly increase, but the raising of armor plate strength and low-temperature impact work value has increased the research and development difficulty.
In addition, the important characteristics that Marine Engineering Steel is different from the deck of boat are exactly not only to require broad ways and length direction that certain mechanical property is arranged, and the required thickness direction has good anti-lamellar tearing performance, and general requirement Z-direction relative reduction in area reaches 35%; Because offshore engineering structure is large welded structures equipment, the weld is many, and the welding property quality directly has influence on welding efficiency, and good welding property is most important with the application of steel to offshore engineering structure.Therefore, it is significant for alleviating domestic energy-intensive situation with steel to develop the thick specification offshore engineering structure of high strength, high tenacity, good welding property and anti-lamellar tearing performance.Although industry has been developed a large amount of ultra high strength structural ship steels, it is less with the steel plate of steel requirement that the performances such as intensity, toughness, welding and anti-lamellar tearing all satisfy the strong maritime works of superelevation:
Publication number is that the CN101353759A patent of invention proposes the steel plate that a kind of yield strength is 550MPa, and its low-temperature flexibility only is-20 ℃ observed value.
Publication number is that CN101984119A patent of invention proposition yield strength is higher than 690MPa, tensile strength is 770-940MPa,-60 ℃ impact is not less than 46J, it adopts TMCP+T, TMCP+L+T, Q+T and Q+L+T explained hereafter ultra high strength ship plate, but its specification is thinner to be 20-50mm only, does not relate to anti-lamellar tearing performance and welding property, and its Ni, Cu content are higher, high expensive is mainly results of laboratory.
Publication number is that the CN101418417A patent of invention adopts TMCP explained hereafter high-strength steel, and yield strength is 390MPa, and tension is 510MPa, its low strength.
Publication number is that the CN101705434A patent of invention proposes a kind of yield strength and is not less than 620MPa, tensile strength 720-890MPa,-60 ℃ of Charpy impacts of matrix and welded heat affecting zone are greater than the ultra high strength structural ship steel of 41J, but its Ni content is up to 1.6-1.8%, and Cu is 1.1-1.3%, and Mo is 0.4-0.6%, its alloy addition level is more, cost is higher, and antagonism lamellar tearing and the mechanical property research of slab heart section are less, and the thickness specification only is 32mm.
Publication number is that the CN101906591A patent of invention adopts controlled rolling and controlled cooling+tempering process to produce 550MPa level offshore engineering structure steel, but its thinner thickness is 60mm to the maximum, and its Ni and Cu content are 0.7%, cost is higher, sets forth few to heart section low-temperature flexibility and welding property.
Publication number is the production method that the CN101781742A patent of invention has proposed the thick E550 of a kind of 18-40mm, its production technique is TMCP, and its thickness is 40mm to the maximum, thinner thickness, its final cooling temperature is 380-500 ℃, be unfavorable for guaranteeing steel-plate shape, increased manufacture difficulty, patent does not relate to welding and anti-lamellar tearing performance.
Publication number is that the CN101812642A patent of invention has proposed a kind of employing TMCP explained hereafter yield strength 690MPa, and tensile strength is 780MPa, and-20 ℃ of Charpy-V impact powers are greater than the steel plate of 120J, and its Charpy-V impact power only is-20 ℃, and maximum ga(u)ge is 60mm.
Publication number is the method that the CN101538681A patent of invention has proposed to produce the Yield strength 700 MPa high-strength steel, and ductile-brittle transition temperature is below-60 ℃, but its thickness is 9mm.
Summary of the invention
The object of the present invention is to provide a kind of ultrahigh-strength structural steel board for ocean engineering and production method thereof, to the high-grade offshore engineering structure demand with steel, the present invention adopts hardening and tempering process (Q+T) technology production high strength, high tenacity, easily welds and have the offshore engineering structure steel of good anti-lamellar tearing performance at Heavy Plate Rolling Line for domestic market.
The superstrength offshore engineering structure steel of the present invention's preparation, its chemical ingredients by mass percent is: C:0.05-0.13%, Si:0.1-0.4%, Mn:0.7-1.7%, Alt:0.01-0.04%, Nb:0.02-0.05%, V:0-0.05%, Ti:0.008-0.02%, Cr:0-0.6%, Mo:0.2-0.4%, Ni:0.15-0.8%, Cu:0-0.5%, B:0-0.0011%, P＜0.01%, S＜0.005%, O＜0.0010%, N＜0.005%, H＜0.00015%, Nb+V+Ti≤0.12%, surplus is Fe and inevitable impurity.
Continuous casting is the 250-350mm heavy slab behind the converter smelting, guarantees compression ratio 4～25, adopts wide strand to reduce broadening than (broadening ratio≤1.6), and control strand macroscopic examination center segregation is lower than C class 1.0; ≤ 50mm steel plate does not add B;＞50mm steel plate adds the B element; Producing the steel plate thickness specification is 10～80mm, and the steel plate microtexture is the tempered sorbite tissue.
The present invention adopts above-mentioned chemical ingredients steel billet, produced yield strength 〉=550MPa by controlled rolling and controlled cooling and thermal treatment process, tensile strength 〉=670MPa, unit elongation 〉=18%, the steel plate of Charpy-V impact power average 〉=100J of-60 ℃, the Z-direction relative reduction in area surpasses 35%; When weld heat input was 50kJ/cm, welding joint weld seam, welded bonds and welded bonds+2mm, welded bonds+5mm and welded bonds+20mm position low-temperature flexibility was good, and its production technique is specific as follows:
1, heating cycle: with heating steel billet to 1150～1200 ℃, heat-up time 250～400min;
2, rolling and process for cooling: for≤the 19mm steel plate, adopt general hot rolling and roll rear air cooling; For＞the 19mm Plate Steel, rollingly be divided into for two stages, be that the recrystallization zone is rolling and the non-recrystallization district is rolling, the recrystallization zone start rolling temperature is 980～1050 ℃, and the rolling pass draft guarantees at least two passages 20～32%, 850～910 ℃ of control non-recrystallization district start rolling temperatures, finishing temperature is 800～840 ℃, and the centre treats that temperature thickness is controlled at 1.0～4.0 times of finished product thickness, adopts and rolls rear water-cooled, final cooling temperature is 510～680 ℃, and speed of cooling is controlled at 6～10 ℃/s.
3, thermal treatment process: adopt modifier treatment technique, quenching temperature is 900～940 ℃, and soaking time is 15～30min, and the stage roller speed of quenching is 2m/min, improves steel plate through hardening effect; During temper, adopt different tempering temperatures and time inside furnace for the different thickness steel plate, tempering temperature is 500～660 ℃, and time inside furnace is 35～240min, guarantees that steel plate has high strength and good impelling strength.
The invention has the advantages that, adopt low-carbon (LC) (C:0.05～0.13%) and low carbon equivalent, improve Plate Welding and low-temperature flexibility; Select heterogeneity design and cooling controlling and rolling controlling process for the different thickness specification, enhance productivity, reduce production costs; For guaranteeing steel-plate shape, adopt rational cooling controlling and rolling controlling process; Strict control blank internal soundness reduces S, P content, and control strand macroscopic examination center segregation is lower than C class 1.0, guarantees the anti-lamellar tearing performance of steel plate and low-temperature flexibility; Adopt wide strand to improve vertical rolling sequence compression ratio, guarantee at least two passage draught greater than 20%, improve low-temperature flexibility by increasing heart section deflection, the different thickness steel plate rationally adds the Ni element and further improves the steel plate center toughness; Utilize Nb, V, Ti microalloy element refinement steel plate crystal grain, thick steel plates increases Mo content and adds the B element and improve steel plate hardening capacity and then guarantee armor plate strength.
The steel plate cost that the present invention produces is lower, comprehensive mechanical property satisfies Marine Engineering Steel to the requirement of every mechanical property: thickness range 10～80mm, yield strength can be stablized and reaches 〉=550MPa, tensile strength 〉=670MPa,-60 ℃ of equal value stabilizations of low-temperature impact work reach 〉=100J, the Z-direction relative reduction in area is greater than 35%, can satisfy offshore engineering structure with steel to intensity, low-temperature impact, welding property and anti-lamellar tearing performance requriements.
Description of drawings
Fig. 1 is the reduction schedule figure of 12mm steel plate.
Fig. 2 is the surface microhardness figure in 12mm Plate Steel transverse section.
Fig. 3 is the micro-organization chart of heart section in 12mm Plate Steel transverse section.
Fig. 4 is the reduction schedule figure of 50mm Plate Steel.
Fig. 5 is the surface microhardness figure in 50mm Plate Steel transverse section.
Fig. 6 is the micro-organization chart of heart section in 50mm Plate Steel transverse section.
Fig. 7 is the reduction schedule figure of 80mm steel plate.
Fig. 8 is the surface microhardness figure in 80mm Plate Steel transverse section.
Fig. 9 is the micro-organization chart of heart section in 80mm Plate Steel transverse section.
Embodiment
The superstrength offshore engineering structure that present embodiment relates to is 12mm with steel thickness, and the component that it comprises and weight percent are: C 0.054%, Si 0.18%, Mn 1.58%, P 0.008%, S0.0014%, Nb 0.048%, Ti 0.014%, Ni 0.19%, Mo 0.14% and surplus are Fe and inevitable impurity element.According to chemical ingredients scope of the present invention, having produced thickness at Heavy Plate Rolling Line is the steel plate of 12mm, and billet size is 250mm*1700mm*2700mm, and final dimension is 12mm*2600mm*35000mm, adopts general hot rolling, rolls rear air cooling.Thermal treatment process: quenching temperature is 930 ℃, soaking time 15min, tempering temperature is 500 ℃, tempering stage time inside furnace is 35min, plate property is excellent, accompanying drawing 1 is the reduction schedule in the steel plate rolling process, and accompanying drawing 2 and accompanying drawing 3 are the microstructure of steel plate, and the mechanical property of steel plate is as shown in table 3.
Table 1 embodiment 1 product mechanical property
It is good that steel plate has-60 ℃ of low temperature impact properties.
The superstrength offshore engineering structure that present embodiment relates to is 50mm with steel thickness, and the component that it comprises and weight percent are: C 0.074%, Si 0.19%, Mn 1.56%, P 0.01%, S 0.002%, Nb 0.02%, Ti 0.014%, V0.05%, Ni 0.34%, Cu 0.21%, Mo 0.34% and surplus are Fe and inevitable impurity element.Billet bloom size is 300mm*2000mm*2950mm, and plate size is 50mm*3000mm*11000mm, and the rolling sequence start rolling temperature is 1006 ℃, and the temperature of rerolling is 811 ℃, and finishing temperature is 803 ℃, and final cooling temperature is 515 ℃, and rolled sheet material template behind aligning is good.Thermal treatment process: quenching temperature is 930 ℃, soaking time 30min, tempering temperature is 610 ℃, tempering stage time inside furnace is 150min, after heat treatment, plate property is excellent, and accompanying drawing 4 is the reduction schedule of 50mm Plate Steel, accompanying drawing 5 and accompanying drawing 6 are the microstructure of 50mm Plate Steel, and the mechanical property of steel plate is as shown in table 2.
Table 2 embodiment 2 product mechanical properties
50mm thickness steel plate among the embodiment 2 all has good low-temperature flexibility at 1/4 place and heart section, and the Z-direction relative reduction in area surpasses 35%.
The superstrength offshore engineering structure that present embodiment relates to is 80mm with steel thickness, and the component that it comprises and weight percent are: C 0.095%, Si 0.20%, Mn 0.98%, P 0.008%, S 0.0014%, Nb 0.022%, Ti 0.013%, V 0.04%, Ni 0.69%, Cu 0.29%, Cr 0.6%, Mo 0.34%, B 0.0011%, Al 0.036% and surplus are Fe and inevitable impurity element.Billet bloom size is 300mm*2400mm*4100mm, and plate size is 80mm*2400mm*15000mm, and start rolling temperature is 845 ℃ after the controlled rolling, and finishing temperature is 816 ℃, and final cooling temperature is 680 ℃, and speed of cooling is 6 ℃/s.Thermal treatment process: quenching temperature is 930 ℃, soaking time 30min, and tempering temperature is 660 ℃, and tempering stage time inside furnace is 240min, and after heat treatment, plate property is excellent.Accompanying drawing 7 is the reduction schedule of 80mm Plate Steel, and accompanying drawing 8 and accompanying drawing 9 are the microstructure of 80mm Plate Steel, and the mechanical property of steel plate is as shown in table 3, and table 4 is the mechanical property of 50kJ/cm welding steel welding joint for heat input.
Table 3 embodiment 3 product mechanical properties
Welding joint heart section mechanical property when table 4 heat input is 50kJ/cm
Claims (2)
1. ultrahigh-strength structural steel board for ocean engineering, it is characterized in that: the chemical ingredients mass percent of this steel plate is: C: 0.05-0.13%, Si:0.1-0.4%, Mn:0.7-1.7%, Alt:0.01-0.04%, Nb:0.02-0.05%, V:0-0.05%, Ti:0.008-0.02%, Cr:0-0.6%, Mo:0.2-0.4%, Ni:0.15-0.8%, Cu:0-0.5%, B:0-0.0011%, P＜0.01%, S＜0.005%, O＜0.0010%, N＜0.005%, H＜0.00015%, Nb+V+Ti≤0.12%, surplus is Fe and inevitable impurity;
Control strand macroscopic examination center segregation is lower than C class 1.0; ≤ 50mm steel plate does not add B;＞50mm steel plate adds the B element; Producing the steel plate thickness specification is 10～80mm, and the steel plate microtexture is the tempered sorbite tissue.
2. ultrahigh-strength structural steel board for ocean engineering production method claimed in claim 1, production technique comprises desulfurizing iron, converter top and bottom complex blowing, vacuum-treat, continuous casting, controlled rolling and controlled cooling, quenching, tempering, it is characterized in that the technical parameter of controlling is in processing step:
(1) continuous casting is 250～350mm heavy slab behind the converter smelting, guarantees compression ratio 4～25, adopts wide strand to reduce the broadening ratio, makes broadening ratio≤1.6, rolls front steel billet and heats, and Heating temperature is 1150-1200 ℃, heat-up time 250～400min;
(2) for≤19mm steel plate, adopt general hot rolling and roll rear air cooling;
For＞the 19mm Plate Steel, rollingly be divided into for two stages, be that the recrystallization zone is rolling and the non-recrystallization district is rolling, the recrystallization zone start rolling temperature is 980～1050 ℃, and the rolling pass draft guarantees at least two passages 20～32%, 850～910 ℃ of control non-recrystallization district start rolling temperatures, finishing temperature is 800～840 ℃, and the centre treats that temperature thickness is controlled at 1.0～4.0 times of finished product thickness, adopts and rolls rear water-cooled, final cooling temperature is 510-680 ℃, and speed of cooling is controlled at 6～10 ℃/s;
(3) adopt modifier treatment technique, quenching temperature is 900～940 ℃, and soaking time is 15～30min, and the stage roller speed of quenching is 2m/min; Tempering temperature is 500～660 ℃, and time inside furnace is 35～240min; Wherein soaking time is the soaking time that the steel plate core temperature begins timing when reaching target temperature; Time inside furnace is that steel plate enters the time that process furnace namely begins timing.
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| CN102011050A (en) * | 2010-07-15 | 2011-04-13 | 秦皇岛首秦金属材料有限公司 | Steel for 36kg-grade ocean platform and production method thereof |
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| CN101358320A (en) * | 2008-09-02 | 2009-02-04 | 首钢总公司 | Steel for controlled rolling and controlled cooling platform and production method thereof |
| CN101876032A (en) * | 2009-12-26 | 2010-11-03 | 舞阳钢铁有限责任公司 | Weather-resistance bridge high-strength steel plate and production method thereof |
| CN102011050A (en) * | 2010-07-15 | 2011-04-13 | 秦皇岛首秦金属材料有限公司 | Steel for 36kg-grade ocean platform and production method thereof |
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