CN102517494B - Rolled steel for wind-power flange and preparation method thereof - Google Patents
Rolled steel for wind-power flange and preparation method thereof Download PDFInfo
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Abstract
The invention relates to rolled steel for a wind-power flange. The rolled steel mainly comprises the following components in percentage by weight: 0.15-0.19 percent of C, 0.17-0.35 percent of Si, 1.45-1.55 percent of Mn, 0.060-0.090 percent of V, 0.02-0.04 percent of Nb, 0.015-0.040 percent of Al, less than or equal to 0.005 percent of Ti, less than or equal to 0.0015 percent of [O], less than or equal to 0.0120 percent of [N], less than or equal to 0.005 percent of S, less than or equal to 0.012 percent of P, less than or equal to 0.04 percent of As, less than or equal to 0.00015 percent of [H] and the balance of Fe. In the invention, the yield strength of the rolled steel is more than 465 MPa, and the tensile strength is more than 580 MPa; and the rolled steel has the characteristics of low-temperature resistance, high welding performance, high strength, high crack sensitivity resistance, high welding performance and high low-temperature impact performance, and can better adapt to the requirement of rolled steel for the wind-power flange in the wind-power industry.
Description
Technical field
The present invention relates to the steel alloy in steel industry, specifically relate to a kind of rolled steel for wind-power flange and preparation method thereof.
Background technology
Along with social development, international community feels the seriousness of environmental pollution and global warming problem day by day, for " by the greenhouse gases stable content in atmosphere a suitable level; and then prevent that violent climatic shift from damaging the mankind ", UNFCCC (United Nations Framework Convention on Climate Change) participating nation has formulated Kyoto Protocol and reduction of discharging plan and progress chart in December, 1997 at kyoto, Japan.Countries in the world take measures to contain the deterioration of environmental problem one after another, are exactly one of effectively measure and help the development of cleaning new energy, are the strategic choices of countries in the world.Wind-powered electricity generation is the abbreviation of wind power generation or wind-power electricity generation, belongs to reproducible clean energy.Wind-power electricity generation is the important form of Wind Power Utilization, and wind energy is the energy renewable, pollution-free, that energy is large, prospect is wide.
Be accompanied by wind-powered electricity generation industry development situation like a raging fire, wind-powered electricity generation also increases substantially by steel demand.Within 2006, China produces 100,000 tons of wind-powered electricity generation steel, compares 2005 and increases by 42.9%; Within 2007, China produces 150,000 tons of wind-powered electricity generation steel, increases by 50% compared with 2006; Within 2008, China produces 320,000 tons of wind-powered electricity generation steel, compares 2007 and increases by 113.3%, can reach ten thousand tons of 100-120 with this velocity estimation wind-powered electricity generation in 2010 with steel.Along with the rapid growth of wind-power electricity generation, market is also more and more large to the demand of wind-power tower, and to wind-power tower key, web member---the importance of tower drum flange is also more and more paid attention to.Because flange will reliably use more than 20 years in the wild, stand various utmost point severe weathers and complicated wind-force repeated load, bearing for a long time the reactive forces such as stretching, bending and shearing in 50～80m eminence, and China's wind-powered electricity generation unit is positioned at domestic northern area and coastland mostly, except thering is enough intensity, outside lighter weight, possesses in addition good low-temperature flexibility, the high-end requirement such as weathering resistance.
The patent CN 101643879 of Nanyang, henan Han Ye special steel company limited discloses a kind of manufacture wind power flange steel and production technique thereof, the composition of described wind power flange steel is by weight percentage: C:0.14～0.17%, Si:0.25～0.40%, Mn:1.35～1.50%, P≤0.015%, S≤0.003%, V≤0.015～0.030%, Nb≤0.025～0.040%, Al0.030～0.045, N≤0.004, H≤0.0001, O≤0.002, As+Cu+Cu≤0.1, this invention is to manufacture wind power flange steel by the method for continuous casting, its overall technical process is: high-quality molten iron, KR hot metal pretreatment, 120 tons of top and bottom combined blown converters, Argon processing, the refining of LF stove, VD Fruit storage, continuous casting, cooling in heap, check, warehouse-in.
The patent CN101906579A of Jiangsu Shagang Group Huaigang Tegang Co.,Ltd discloses a kind of low temperature resistant, high welding performance, high-intensity wind power flange steel, its chemical composition wt% is: C 0.13-0.18%, Si 0.17-0.40%, Mn 1.30-1.45%, V 0.035-0.060%, Nb 0.03-0.05%, Al0.015-0.030%, Ti 0.010-0.020%, S≤0.005%, P≤0.015%, As≤0.04%, [O]≤0.0020%, [N] 0.0060-0.0110%, [H]≤0.0002%, surplus is Fe; Require the carbon equivalent ce V 0.40-0.43% of material simultaneously.The flange that this invention gained steel grade is made is after normalizing treatment, and performance is as follows: tensile strength Rm=500-570MPa; Yield strength Rel=325-360MPa; Elongation A5=28-39%; Relative reduction in area Z=76-85%;-50 ℃ of v-notch Impact energy Ak v=110-180J, have good welding property, and have stable low temperature impact properties and higher intensity.
Inclusion in steel equally also can cause many defects, and for example total oxygen content in molten steel is obviously relevant with the cracking frequency of product, finally affects the operation life of wind power plant.
The manufacturing process of wind power flange is: continuous cast round billets blanking → shove charge heating → forge hot is thick → and hot piercing → rolling ring → cooling → normalizing → turning → flaw detection → boring → warehouse-in.For large-scale wind electricity flange, guarantee material good welds performance, make material obtain high resistance to low temperature, and guarantee high intensity and the cleanliness factor of steel, the high crack-resistance sensitivity that obtains steel is the design requirements to rolled steel for wind-power flange.
The current development along with industry, the units such as 1MW, 1.5MW, 3MW occur in succession, the yield strength of existing steel is 345MPa left and right, the yield strength maximum of the disclosed flange steel of patent CN 101643879 and CN101906579A is only also 360MPa, little with existing steel difference, as flange steel material, certainly will cause weight of equipment greatly to increase, waste resource, is unfavorable for the Sustainable development of national economy.Therefore, be badly in need of the high obdurability steel of a kind of strength grade of exploitation, and reach the requirement of high-cleanness, long-fatigue life, low crack-resistance sensitivity, in order to replace the widely used Medium And Low Strength Steels of existing market for wind power flange, become the objective demand in market.
Summary of the invention
For the deficiency that prior art rolled steel for wind-power flange strength grade is low, not low temperature resistant, welding property is not high, be prone to crackle, one of object of the present invention is to provide a kind of rolled steel for wind-power flange, and described steel have the performance of high strength, low temperature resistant, high welding performance, cracking resistance line.Identical with existing rolled steel for wind-power flange, steel of the present invention also mainly comprise Fe, C, Mn, V, Si, Nb, several elements of Al, but the present invention is by adjusting the proportioning of each element wherein, make the yield strength of rolled steel for wind-power flange provided by the invention can be greater than 465MPa, tensile strength is greater than 580MPa.
Steel of the present invention by weight percentage comprise following component: C 0.15-0.19%, Si 0.17-0.35%, Mn 1.45-1.55%, V 0.060-0.090%, Nb 0.02-0.04%, Al 0.015-0.040%, Ti≤0.005%, [O]≤0.0015%, [N]≤0.0120%, S≤0.005%, P≤0.012%, As≤0.04%, [H]≤0.00015%, surplus is Fe.Preferably, described steel mainly contain following component by weight percentage: C 0.15-0.19%, Si 0.17-0.35%, Mn 1.45-1.55%, V 0.061-0.090%, Nb 0.02-0.04%, Al 0.015-0.040%, Ti≤0.003%, [O]≤0.0015%, [N]≤0.0120%, S≤0.0048%, P≤0.012%, As≤0.035%, [H]≤0.00015%, surplus is Fe.
C (Carbon), is effective hardening element in steel, is one of brittle transition temperature element significantly improving steel, can significantly improve intensity, hardening capacity and the hardenability of steel, increases its intensity and hardness; But along with the increase of carbon content, plasticity and the ductility of steel but decrease, steel is become fragile and be difficult to processing, reduce the welding property of material.Otherwise along with the minimizing of carbon content, the toughness of steel is enhanced and is easy to machining.
Thus, steel need to have a certain amount of carbon, it is best that performance just reaches, it is 0.15-0.19wt% that the present invention selects C content, such as 0.151wt%, 0.152wt%, 0.155wt%, 0.16wt%, 0.162wt%, 0.168wt%, 0.17wt%, 0.18wt%, 0.186wt%, 0.189wt%, 0.19wt% etc., preferably 0.15-0.16wt%.If C content is lower than 0.15%, the intensity of steel is low, and mechanical property is less than the requirement of wind power flange; If C content is higher than 0.19%, coordinate adding of other elements in the present invention, plasticity index, welding property and the low temperature impact properties of steel all do not reach the service requirements of wind power flange steel.
Mn (Manganese), is one of element important in steel, contributes to steel to generate texture structure, increases its soundness, intensity and wearability.Mn and iron can form sosoloid, improve ferrite and austenitic hardness and intensity in steel, are again carbide forming elements simultaneously, enter and in cementite, replace a part of iron atom.Mn owing to reducing critical transition temperature, plays the effect of crystal grain thinning in steel, also indirectly plays the effect that improves perlitic steel intensity.Austenite in steel is that a kind of plasticity is fine, and intensity is lower, has certain toughness, does not have ferromagnetic sosoloid.Dissolve in austenite at steel alloy interalloy element, and expand or dwindle temperature and the composition range of austenite stable region, and Mn forms steel and the ability of stable austenite is only second to Ni.The present invention adds Mn to have the following advantages in steel: a, can expand the austenite phase region in carbon iron balance phasor, thereby can make steel form austenite, and stable austenite; B, the hardening capacity of increase steel that can be strong.But should strictly control the add-on of Mn, because Mn content higher time, have the tendency of the grain coarsening of making, and increases the crisp susceptibility of tempering of steel.
Preferably, it is 1.45-1.55wt% that the present invention selects the add-on of Mn, such as 1.455wt%, 1.46wt%, 1.49wt%, 1.51wt%, 1.53wt%, 1.54wt%, 1.548wt%, 1.549wt% etc., preferably 1.46-1.55wt%.
Si (Silicon), is one of important element of steel, contributes to strengthen the intensity of steel, and specifically, Si is present in ferrite or austenite with the form of sosoloid, and it plays and improves the intensity of sosoloid and the effect of cold deformation cementation index.Si is medium on the hardening capacity impact of steel, but high tempering stability and antioxidant property to steel has very large benefit, but reduces to a certain extent toughness and the plasticity of steel simultaneously, simultaneously and Mn do the used time, the temper brittleness of raising steel.
Preferably, the add-on of steel Si of the present invention is 0.17-0.35wt%, such as 0.171wt%, 0.172wt%, 0.19wt%, 0.26wt%, 0.29wt%, 0.31wt%, 0.34wt%, 0.349wt%, 0.35wt% etc., preferably 0.26-0.35wt%.
V (Vanadium), is also one of important element of steel, can strengthen antiwear property and the ductility of steel, specifically, vanadium can play thinning microstructure crystal grain in steel, improves grain coarsening temperature, reduce the superheated susceptivity of steel, thereby improve intensity and the toughness of steel; Increase temper resistance, and produce secondary hardening effect.The steel of centering, low carbon content, no matter at annealing, normalizing or quality adjustment condition, vanadium, except improving beyond the intensity, particularly yield-point and yield tensile ratio of steel, also improves plasticity and the toughness of steel.Due to the refinement of material grains, so the grain size number of material improves greatly after refinement, the proportion of crystal boundary strengthens, the strength increase of steel simultaneously, and material reduces greatly to the susceptibility of crackle.
Preferably, the add-on of steel V of the present invention is 0.060-0.090wt%, such as 0.060wt%, 0.061wt%, 0.067wt%, 0.073wt%, 0.079wt%, 0.085wt%, 0.089wt%, 0.090wt% etc.
Nb (Niobium), can improve yield strength and the impelling strength of steel, reduces the loud and clear transition temperature of steel, and improves its welding property.The steel higher to Mn content, the effect of improving welding property is more remarkable.Nb can improve intensity and the toughness of low-carbon low-alloy steel simultaneously, and being mainly crystal grain by his refinement steel and solid solution makes it strengthening and the result of niobium carbide and niobium nitride precipitation strength as ferrite.But in strengthening when steel, if the too high levels of Nb or during with higher content and V acting in conjunction easily makes steel generation fragility.Preferably, the add-on of Nb of the present invention is 0.02-0.04wt%, such as 0.021wt%, 0.022wt%, 0.026wt%, 0.031wt%, 0.035wt%, 0.039wt%, 0.04wt% etc.
Al (Aluminum), can improve the oxidation-resistance of steel, reduces gas content in steel, thereby improves wear resistance and the fatigue strength of steel, improves low-temperature performance and the corrosion resisting property of steel simultaneously.Unlike the prior art, the present invention adds Al in rolled steel for wind-power flange, after other component compatibilities, can greatly improve fatigue strength and the wear resistance of steel.But when Al content is lower than 0.015% time, the deoxidation effect of material is poor, and purity is low, if but Al content higher than 0.040%, form hard Al
2o
3be mingled with probability and increase substantially, thus the fatigue lifetime of reducing steel, the impelling strength of deterioration steel.Preferably, the add-on of Al of the present invention is 0.015-0.040wt%, such as 0.015wt%, 0.016wt%0.021wt%, 0.029wt%, 0.033wt%, 0.038wt%, 0.039wt%, 0.040wt% etc.
Ti (titanium) is one of very active metallic element, and it and nitrogen, oxygen, carbon have extremely strong avidity, and therefore the present invention utilizes it to fix the nitrogen in steel.Ti element and carbon form a kind of carbide TiC, and this carbide bonding force is extremely strong, and stabilizer pole is difficult for decomposing, and in steel, is only heated to more than 1000 ℃, could dissolve in lentamente in sosoloid (α or γ phase).Before not dissolving in, titanium carbide particulate has the grow up effect of alligatoring of the crystalline grain of steel of prevention.Therefore, carry out crystal grain thinning with Ti, by the more than 1000 ℃ of grain coarsening temperature raising of this steel, both avoided the crack sensitivity of this steel, improved the comprehensive mechanical property of material, but the effect of Ti and N is all more remarkable than the effect of Nb and V simultaneously, while adding Ti, can reduces the effect of V and Nb, the TiCN simultaneously generating can reduce the resistance to low temperature of steel greatly, thereby the present invention stipulates remaining Ti≤0.005%; Preferred remaining Ti≤0.003%.
N (Nitrogen), in steel, mainly play solution strengthening and precipitation strength, be the element of a kind of very strong formation and stable austenite, the effect that it expands austenite phase region is 20 times of Ni, so can replace a part of Ni in some Cryogenic Steel.The effect main manifestations of N in steel is: solution strengthening and ageing strengthening; Form and stable austenite tissue; Form stable nitride with Al, V, Nb, Ti etc. in steel, will greatly increase the performance such as intensity, hardness and antifatigue of steel.But N causes timeliness and the blue shortness phenomenon of steel, too high N also can cause the loose and bubble of steel.The content of N of the present invention is≤0.0120%, such as 0.0119wt%, 0.0115wt%, 0.0110wt%, 0.0101wt%, 0.0090wt%, 0.0060wt% etc.
O (Oxygen) intensity effect to steel in the time of room temperature is little, but the elongation of steel and reduction of area are reduced significantly, and at lesser temps and O content, when extremely low, the intensity of material and plasticity all sharply reduce with the increase of O content.Impact property aspect, the maximum value of impacting along with the increase of O content reduces gradually, and brittle transition temperature but raises soon, and the scope of brittle transition temperature is also along with broadening.Meanwhile, along with the increase of O content, the oxide inclusion probability of material increases greatly, thereby reduces the fatigue lifetime of material.The present invention and production technique can be controlled at O content in 0.0015%, thereby guarantee be better than prior art aspect the cleanliness of steel.
P, S, As element cause embrittlement of grain boundaries in intergranular segregation, can cause material at high temperature temper brittleness, when P, S, As exceed certain content, the brittle transition temperature of steel be improved a lot simultaneously, cause material at low temperature impelling strength low, worsen the comprehensive mechanical property of steel.So the present invention has made relevant regulation to above-mentioned residual element.
Preferably, the content of P, S in steel of the present invention, As and [H] is respectively S≤0.005%, P≤0.012%, As≤0.04%, [H]≤0.00015% by weight percentage.
In steel alloy, beyond de-carbon, intensity and the weldability of various alloying elements to steel also plays an important role.Just represent with carbon equivalent simply by the statistics of great number tested data for ease of strength property and the welding property of expressing these materials.Carbon equivalent (carbon equivalent, be abbreviated as CEV), be converted to the content of carbon by various alloying elements in iron and steel, object is that its concrete calculation formula is in order to weigh material welding property: CEV=[C+Mn/6+ (Cr+Mo+V)/5+ (Ni+Cu)/15] × 100%.But, because carbon equivalent is to be made up of the principal element in this steel, so carbon equivalent also affects the mechanical property of material, in the time that carbon equivalent is less than 0.40%, the mechanical property of material does not reach the service requirements of material, in the time that carbon equivalent is greater than 0.46%, the welding property of material is poor, and crack sensitivity is also higher.
Preferably, the carbon equivalent of steel of the present invention is 0.40-0.46%, for example 0.401%, 0.402%, 0.409%, 0.432%, 0.448%, 0.457%, 0.459%, 0.46%, and preferably 0.41-0.46%, further preferred 0.43-0.46%, particularly preferably 0.44-0.46%.
Rolled steel for wind-power flange of the present invention, there is the feature of low temperature resistant, high welding performance, high strength, crack-resistance sensitivity, in order to realize these advantages, be to require C, Mn, V to control according to the upper limit of addition (or lower limit) aspect control of element simultaneously, if one of C, Mn, V approach the internal control upper limit (or lower limit), another element must be controlled by internal control lower limit (or upper limit), guarantees that carbon equivalent is within the requirement of design.
Patent steel grade for low temperature resistant, high welding performance, high strength, crack-resistance sensitivity wind power flange steel is currently reported, and the typical but example of non-limit has: patent CN 101643879 and CN101906579A.Each constituent content in existing steel and steel of the present invention is contrasted to situation following (in weight ratio, unit is wt%) below:
| Element classification | C | Si | Mn | V | Nb | Al | As | S | P | [N] | [H] | [O] | Ti | CEV |
| This patent | 0.16 | 0.25 | 1.50 | 0.080 | 0.025 | 0.025 | 0.008 | 0.002 | 0.010 | 0.0080 | 0.00009 | 0.0007 | 0.003 | 0.45 |
| CN 101643879 | 0.16 | 0.32 | 1.38 | 0.050 | 0.040 | 0.026 | 0.005 | 0.003 | 0.011 | 0.0075 | 0.0001 | 0.0016 | 0.016 | 0.42 |
| CN101906579A | 0.15 | 0.27 | 1.40 | 0.020 | 0.030 | 0.040 | 0.005 | 0.002 | 0.014 | 0.0036 | 0.0001 | 0.0018 | 0.004 | 0.39 |
The present invention is achieved through the following technical solutions:
Described steel contain following component by weight percentage: C 0.15-0.188%, Si 0.172-0.35%, Mn 1.46-1.55%, V 0.061-0.090%, Nb 0.02-0.04%, Al 0.015-0.040%, Ti≤0.005%, [O]≤0.0015%, [N]≤0.0120%, S≤0.0048%, P≤0.011%, As≤0.015%, [H]≤0.00015%, surplus is Fe.
As optimal technical scheme, described steel contain following component by weight percentage: C 0.15-0.16%, Si 0.26-0.35%, Mn 1.46-1.55%, V 0.061-0.090%, Nb 0.02-0.04%, Al0.015-0.040%, Ti≤0.003%, [O]≤0.0015%, [N]≤0.0120%, S≤0.0045%, P≤0.010%, As≤0.015%, [H]≤0.00015%, surplus is Fe.
As optional technical scheme, described steel contain following component: C 0.155%, Si0.32% by weight percentage, Mn 1.52%, Nb 0.027%, V 0.080%, Al 0.029%, Ti 0.005%, S 0.0021%, P 0.006%, As 0.009%, [O] 0.0010%, [N] 0.0092%, [H] 0.00010%, remaining is Fe.
Two of object of the present invention is to provide a kind of preparation method of described rolled steel for wind-power flange.
The preparation method of rolled steel for wind-power flange provided by the present invention comprises melting → refining → slag removal, and described refining is carried out in a refining unit, preferably in refining furnace, carries out.
Preferably, described slagging-off is carried out after the adjustment of refining composition completes, and preferably slag removal adopts RH or/and VD stove carries out vacuum outgas and removal of inclusions; Further preferably after vacuum outgas
The preparation method of rolled steel for wind-power flange provided by the present invention is preferably achieved through the following technical solutions: in conventional converter or electric furnace after melting, in refining furnace, carry out refining, after the adjustment of refining composition completes, adopt RH/VD stove to carry out vacuum outgas, then carry out the processing of calcium inclusion modification.
The wind power flange that adopts rolled steel for wind-power flange provided by the invention to manufacture, after normalizing+high tempering is processed, the wind power flange obtaining has following performance: tensile strength R
m=580-720MPa; Yield strength R
el=470-500MPa; Elongation A
5=22-26%; Relative reduction in area Z=66-72%;-20 ℃, v-notch Impact energy Ak v=60-90J.
Three of object of the present invention is to provide a kind of purposes of rolled steel for wind-power flange.
Described rolled steel for wind-power flange is for wind-power electricity generation industry, be preferred for manufacturing have low temperature resistant, high welding performance, the wind power flange of high strength, the requirement of cracking resistance line.
Compared with prior art, the present invention has following beneficial effect:
(1) rolled steel for wind-power flange of the present invention element used is with same as the prior art, but the present invention is by adjusting each element proportioning in steel, and in conjunction with suitable preparation method, the yield strength of the steel that finally prepare is greater than 465MPa, and tensile strength is greater than 580MPa; Far above the yield strength of existing rolled steel for wind-power flange 360MPa.Calculate according to identical intensity, use rolled steel for wind-power flange of the present invention, the gross weight of flange can reduce 30%, in meeting performance requriements, has greatly alleviated the weight of equipment like this, and has reduced materials'use amount, has reduced greatly cost.
(2) the present invention is by adjusting C in steel, Mn, V, Si, Nb, Al, N, the mixing ratio of O, improve the cleanliness factor of steel, the performances such as fatigue lifetime, steel are become low temperature resistant, high welding performance, high strength, the wind power flange steel that crack-resistance sensitivity is good, compared with existing flange steel material, rolled steel for wind-power flange provided by the invention is more suitable for existing wind-powered electricity generation unit (for example 1MW, 1.5MW, the wind-powered electricity generation units such as 3MW), the good welding performance of wind power flange steel provided by the invention simultaneously, low temperature impact properties is good, be very suitable for the field work of wind power equipment.
(3) the present invention passes through RH or/and VD technique can significantly improve the cleanliness factor of steel, thereby significantly improves the obdurability of steel, improves fatigue lifetime and the crack-resistance sensitivity of material.
Embodiment
For ease of understanding the present invention, it is as follows that the present invention enumerates embodiment.Those skilled in the art should understand, described embodiment helps to understand the present invention, should not be considered as concrete restriction of the present invention.
Rolled steel for wind-power flange of the present invention is adopted with the following method and is prepared:
In conventional converter or electric furnace, after melting, in refining furnace, carry out refining, after the adjustment of refining composition completes, adopt RH/VD stove to carry out vacuum outgas, then carry out the processing of calcium inclusion modification.
Embodiment mono-
The chemical composition of steel comprises: C 0.15%, Si 0.32%, Mn 1.52%, Nb 0.028%, V 0.080%, Al 0.026%, Ti 0.005%, S 0.0020%, P 0.009%, As 0.008%, [O] 0.0007%, [N] 0.0090%, [H] 0.00008%, surplus is Fe.
Roll over ring gauge lattice: 3282 × 2970 × 100, through 930 ℃ of normalizing+660 ℃ tempering, the mechanical property of gained is as follows:
Tensile strength R
m=650MPa, yield strength R
el=500MPa, elongation A
5=23%, relative reduction in area Z=68% ,-20 ℃, v-notch Impact energy Ak v:62J, 66J, 64J.
Embodiment bis-
The chemical composition of steel comprises: C 0.18%, Si 0.29%, Mn 1.42%, Nb 0.030%, V0.078%, Al 0.025%, Ti 0.003%, S 0.0030%, P 0.011%, As 0.006%, [O] 0.0009%, [N] 0.0078%, [H] 0.00008%, surplus is Fe.
Roll over ring gauge lattice: 4200 × 3800 × 110, through 930 ℃ of normalizing+650 ℃ tempering, the mechanical property of gained is as follows:
Tensile strength R
m=680MPa, yield strength R
el=490MPa, elongation A
5=24%, relative reduction in area Z=70% ,-20 ℃, v-notch Impact energy Ak v:60J, 80J, 76J.
Embodiment tri-
C 0.16%, Si 0.35%, Mn 1.50%, Nb 0.032%, V 0.075%, Al 0.015%, Ti 0.004%, S 0.0031%, P 0.009%, As 0.011%, [O] 0.0012%, [N] 0.0108%, [H] 0.00013%, surplus is Fe.
Roll over ring gauge lattice: 4000 × 3582 × 140, through 930 ℃ of normalizing+650 ℃ tempering, the mechanical property of gained is as follows:
Tensile strength R
m=620MPa, yield strength R
el=460MPa, elongation A5=26%, relative reduction in area Z=72% ,-20 ℃, v-notch Impact energy Ak v:86J, 78J, 82J.
Embodiment tetra-
C 0.19%, Si 0.17%, Mn 1.50%, Nb 0.020%, V 0.060%, Al 0.028%, Ti 0.003%, S 0.0030%, P 0.012%, As 0.007%, [O] 0.0015%, [N] 0.0120%, [H] 0.00014%, surplus is Fe.
Roll over ring gauge lattice: 4000 × 3582 × 140, through 930 ℃ of normalizing+650 ℃ tempering, the mechanical property of gained is as follows:
Tensile strength R
m=720MPa, yield strength R
el=465MPa, elongation A
5=22%, relative reduction in area Z=66% ,-20 ℃, v-notch Impact energy Ak v:86J, 78J, 82J.
Embodiment five
C 0.18%, Si 0.26%, Mn 1.46%, Nb 0.029%, V 0.078%, Al 0.040%, Ti 0.004%, S 0.0041%, P 0.004%, As 0.040%, [O] 0.0013%, [N] 0.0088%, [H] 0.00009%, surplus is Fe.
Roll over ring gauge lattice: 4000 × 3582 × 140, through 930 ℃ of normalizing+650 ℃ tempering, the mechanical property of gained is as follows:
Tensile strength R
m=580MPa, yield strength R
el=475MPa, elongation A
5=26%, relative reduction in area Z=72% ,-20 ℃, v-notch Impact energy Ak v:60J, 76J, 89J.
Although the contained composition of rolled steel for wind-power flange of the present invention and patent CN 101643879 and the disclosed rolled steel for wind-power flange of CN101906579A is approximate, the technique effect that the present invention obtains is better than patent CN 101643879 and CN101906579A far away.In the mechanical property that the above embodiment of the present invention is recorded and patent CN101906579A, the mechanical property of disclosed wind power flange steel compares, can obviously find out, the yield strength of flange steel material of the present invention is more than or equal to 465MPa, substantially drop in the scope of 465MPa-500MPa, tensile strength is more than or equal to 580MPa, substantially all drop in the scope of 580MPa-720MPa, far above the yield strength of existing rolled steel for wind-power flange 360MPa.If think that the mechanical property requirements of rolled steel for wind-power flange is identical, calculate according to identical intensity, use rolled steel for wind-power flange of the present invention, the gross weight of flange can reduce 30%, that is to say, adopts rolled steel for wind-power flange provided by the present invention, can meet performance requriements, can greatly alleviate again the weight of equipment, reduce materials'use amount, reduce greatly cost.
Applicant's statement, the present invention illustrates detailed composition and the preparation technology of rolled steel for wind-power flange of the present invention by above-described embodiment, but the present invention is not limited to above-mentioned detailed composition and preparation technology's flow process, do not mean that the present invention must rely on above-mentioned detailed composition and preparation technology's flow process could be implemented.Person of ordinary skill in the field should understand, any improvement in the present invention, and the selections of the equivalence replacement to the each raw material of product of the present invention and the interpolation of ancillary component, concrete mode etc., within all dropping on protection scope of the present invention and open scope.
Claims (13)
1. a rolled steel for wind-power flange, described steel mainly comprise Fe, C, Mn, V, Si, Nb, Al, it is characterized in that the tensile strength R of described steel
m=580-720MPa; Yield strength R
el=470-500MPa; Elongation A
5=22-26%; Relative reduction in area Z=66-72%;-20 ℃, v-notch Impact energy Ak v=60-90J;
Wherein, described steel comprise following component: C0.15-0.19%, Si0.17-0.35% by weight percentage, Mn1.45-1.55%, V0.060-0.090%, Nb0.02-0.04%, Al0.026-0.040%, Ti≤0.005%, ［ O ］≤0.0015%, ［ N ］≤0.0078%, S≤0.005%, P≤0.012%, As≤0.04%, ［ H ］≤0.00015%, surplus is Fe;
Wherein, the carbon equivalent of described steel is 0.40-0.46%; The calculation formula of described carbon equivalent is: CEV=[C+Mn/6+ (Cr+Mo+V)/5+(Ni+Cu)/15] × 100%.
2. steel as claimed in claim 1, is characterized in that, described steel comprise following component: C0.15-0.19% by weight percentage, Si0.17-0.35%, Mn1.45-1.55%, V0.061-0.090%, Nb0.02-0.04%, Al0.026-0.040%, Ti≤0.003%, ［ O ］≤0.0015%, ［ N ］≤0.0078%, S≤0.0048%, P≤0.012%, As≤0.035%, ［ H ］≤0.00015%, surplus is Fe.
3. steel as claimed in claim 1 or 2, is characterized in that, the carbon equivalent of described steel is 0.41-0.46%.
4. steel as claimed in claim 3, is characterized in that, the carbon equivalent of described steel is 0.43-0.46%.
5. steel as claimed in claim 3, is characterized in that, the carbon equivalent of described steel is 0.44-0.46%.
6. steel as claimed in claim 1, is characterized in that, described steel comprise following component: C0.15-0.188% by weight percentage, Si0.172-0.35%, Mn1.46-1.55%, V0.061-0.090%, Nb0.02-0.04%, Al0.026-0.040%, Ti≤0.005%, ［ O ］≤0.0015%, ［ N ］≤0.0078%, S≤0.0048%, P≤0.011%, As≤0.015%, ［ H ］≤0.00015%, surplus is Fe.
7. steel as claimed in claim 1, is characterized in that, described steel comprise following component: C0.15-0.16% by weight percentage, Si0.26-0.35%, Mn1.46-1.55%, V0.061-0.090%, Nb0.02-0.04%, Al0.026-0.040%, Ti≤0.003%, ［ O ］≤0.0015%, ［ N ］≤0.0078%, S≤0.0045%, P≤0.010%, As≤0.015%, ［ H ］≤0.00015%, surplus is Fe.
8. a preparation method for the rolled steel for wind-power flange as described in claim 1-7 any one, comprises melting → refining → slag removal, it is characterized in that, described refining is carried out in a refining unit.
9. method as claimed in claim 8, is characterized in that, described refining is carried out in refining furnace.
10. method as claimed in claim 8 or 9, is characterized in that, described slagging-off is carried out after the adjustment of refining composition completes.
11. methods as claimed in claim 10, is characterized in that, slag removal adopts RH or/and VD stove carries out degassed and removal of inclusions.
12. methods as claimed in claim 11, is characterized in that, carry out the processing of calcium inclusion modification after vacuum outgas.
The purposes of 13. 1 kinds of rolled steel for wind-power flanges as described in claim 1-7 any one, is characterized in that, described rolled steel for wind-power flange is for wind-power electricity generation industry.
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