CN102605243B - Wind power H-beams and production method thereof - Google Patents
Wind power H-beams and production method thereof Download PDFInfo
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- CN102605243B CN102605243B CN 201210069513 CN201210069513A CN102605243B CN 102605243 B CN102605243 B CN 102605243B CN 201210069513 CN201210069513 CN 201210069513 CN 201210069513 A CN201210069513 A CN 201210069513A CN 102605243 B CN102605243 B CN 102605243B
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- 238000007689 inspection Methods 0.000 description 4
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- 229910000746 Structural steel Inorganic materials 0.000 description 2
- UCKMPCXJQFINFW-UHFFFAOYSA-N Sulphide Chemical compound [S-2] UCKMPCXJQFINFW-UHFFFAOYSA-N 0.000 description 2
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- GUCVJGMIXFAOAE-UHFFFAOYSA-N niobium atom Chemical compound [Nb] GUCVJGMIXFAOAE-UHFFFAOYSA-N 0.000 description 2
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- UPLPHRJJTCUQAY-WIRWPRASSA-N 2,3-thioepoxy madol Chemical compound C([C@@H]1CC2)[C@@H]3S[C@@H]3C[C@]1(C)[C@@H]1[C@@H]2[C@@H]2CC[C@](C)(O)[C@@]2(C)CC1 UPLPHRJJTCUQAY-WIRWPRASSA-N 0.000 description 1
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Abstract
The invention provides wind power H-beams and a production method thereof. The production method includes: smelting molten steel to obtain target molten steel; subjecting the target molten steel to beam blank continuous casting under full protection; rolling beam blanks, ensuring reduction of finish rolling to be between a austenite field and a ferrite field, and performing strengthened air cooling to obtain the wind power H-beams, wherein the target molten steel comprises, by weight, 0.14-0.22% of C, 0.20-0.50% of Si, 1.20-1.50% of Mn, not more than 0.010% of S, not more than 0.020% of P, 0.010-0.050% of Nb, not more than 40X10-6 of N, not more than 10X10-6 of O, not more than 3X10-6 of H, the balance of Fe and unavoidable impurities. The wind power H-beams are fine in low temperature impact toughness and strength, fine in internal quality and lamellar tearing resistance, fine in surface quality and fine in corrosion resistance, and can meet the requirements of wind power generation on high performance steel.
Description
Technical field
The present invention relates to H shaped steel technical field, more particularly, relate to a kind of H shaped steel and production method thereof for wind-powered electricity generation that possesses excellent comprehensive performance.
Background technology
The coastal wind power plant low for envrionment temperature, that wind-force is large and corrodibility is strong, the steel that construction structure is used must possess low-temperature impact-resistant, high strength, anti-lamellar tearing and solidity to corrosion preferably.
Flourish along with New Energy Industry, can welcome increasing coastal Wind Power Project construction, and the demand that this can greatly stimulate the wind energy turbine set structural steel especially possesses the steel of excellent comprehensive performance.
The Chinese patent application that disclosed application number was CN101736207A on June 16th, 2010 discloses a kind of niobium and vanadium-containing economical high-strength and high-weather-resistance hot rolled H shaped steel steel.Yet this application is adopting the mode that V-Nb-Cu-Cr-Ni is compound aspect the Composition Design of steel, although obtained higher tough combination and good weather resistance, cost of alloy is too high, and production difficulty is large.
The Chinese patent application that disclosed application number was CN102021475A on April 20th, 2011 discloses a kind of hot-rolled H-shaped steel for low temperature-resisting structure and preparation method thereof.In this application, the Composition Design of steel is not strictly controlled nitrogen, oxygen, the hydrogen of refining link.And the separating out to make be easy to occur strand subsurface bubble, pin hole in the casting for shaped blank continuous process of nitrogen, hydrogen, and in the operation of rolling, elongate, expansion, cause the finished product crack defect to occur.This application, in process of cooling, has adopted fast cold measure between finish to gauge is to 500-600 ℃, the stage that this process is the most violent on the occasion of phase transformation, may bring very large unrelieved stress, and unfavorable for physical dimension and the toughness of product.
Summary of the invention
The deficiency existed for prior art, one of purpose of the present invention be to provide a kind of for the manufacture of economical low-carbon microalloy, high-strength, high tenacity, be applicable to build the method for the severe wind-powered electricity generation of service condition with H shaped steel.Another object of the present invention is to provide a kind of economical low-carbon microalloy, high-strength, high tenacity, be applicable to build the severe wind-powered electricity generation of service condition H shaped steel.
An aspect of of the present present invention provides the production method of a kind of wind-powered electricity generation with H shaped steel.Described production method comprises the following steps: smelting molten steel to be to obtain the target molten steel, the composition of described target molten steel by 0.14～0.22% C by weight, 0.20～0.50% Si, 1.20～1.50% Mn, be no more than 0.010% S, be no more than 0.020% P, 0.010～0.050% Nb, be no more than 40 * 10
-6n, be no more than 10 * 10
-6o, be no more than 3 * 10
-6h, and surplus Fe and inevitably impurity form; Described target molten steel is carried out to casting for shaped blank continuous, adopt the full guard casting during continuous casting; The rolling Hot Metal in Beam Blank, and guarantee the depressing in austenite and ferrite two-phase region of finish to gauge, then strengthened air cooling, to make wind-powered electricity generation H shaped steel.
In the embodiment at wind-powered electricity generation according to the present invention by the production method of H shaped steel; when the full guard cast in described continuous casting step is included in casting, ladle nozzle and submerged nozzle are sealed; adopt alkaline covering agent to cover pouring basket liquid level, and adopt crystallizer protecting residue to cover mold liquid level.
In the embodiment at wind-powered electricity generation according to the present invention by the production method of H shaped steel, described rolling step comprises roughing and finish rolling, and wherein, the start rolling temperature of roughing is 1150～1200 ℃, and the temperature that roughing finishes is 1040～1100 ℃; The start rolling temperature of finish rolling is 980～1010 ℃, and the finish to gauge end temp is 820～840 ℃.
In the embodiment at wind-powered electricity generation according to the present invention by the production method of H shaped steel, the rate of cooling of described strengthening air cooling is 4-6 ℃/s.
In the embodiment at wind-powered electricity generation according to the present invention by the production method of H shaped steel, C content in described target molten steel is 0.14～0.18%, Si content is 0.20～0.30%, Mn content is 1.20～1.40%, S content is 0.001～0.008%, P content is that 0.001～0.020%, Nb content is 0.025～0.035%.
In the embodiment at wind-powered electricity generation according to the present invention by the production method of H shaped steel, the carbon equivalent ce V=C+Mn/6+ (Cr+Mo+V) of described target molten steel/5+ (Cu+Ni)/15≤0.43, and manganese sulphur ratio is not less than 20.
Another aspect of the present invention provides a kind of wind-powered electricity generation H shaped steel.Described wind-powered electricity generation adopts method as above to make with H shaped steel.
In the embodiment at wind-powered electricity generation according to the present invention with H shaped steel, described wind-powered electricity generation with the composition of H shaped steel by 0.14～0.22% C by weight, 0.20～0.50% Si, 1.20～1.50% Mn, be no more than 0.010% S, be no more than 0.020% P, 0.010～0.050% Nb, be no more than 40 * 10
-6n, be no more than 10 * 10
-6o, be no more than 3 * 10
-6h, and surplus Fe and inevitably impurity form.
Compared with prior art, wind-powered electricity generation of the present invention has the following advantages by H type and production method thereof: (1) provides a kind of accurate Composition Design scope of H shaped steel of excellent comprehensive performance, and simplicity of design, do not add noble metal, with low cost; (2) adopt heat engine tool controlled rolling technology to produce, obtained normal heat and processed the desirable weave construction that all is beyond one's reach, significantly optimized steel performance; (3) wind-powered electricity generation of the present invention possesses excellent tough coupling with H shaped steel, excellent interior tissue and surface quality and good anti-lamellar tearing and the corrosion resisting property therefore brought.
The accompanying drawing explanation
The metallographic structure photo of Fig. 1 H shaped steel that to be wind-powered electricity generation according to the present invention obtain by the example 1 of the production method of H shaped steel.
Embodiment
Hereinafter, describe with reference to the accompanying drawings exemplary embodiment of the present invention in detail.
Wind-powered electricity generation according to the present invention comprises the following steps by the production method of H shaped steel: smelting molten steel to be to obtain the target molten steel, the composition of described target molten steel by 0.14～0.22% C by weight, 0.20～0.50% Si, 1.20～1.50% Mn, be no more than 0.010% S, be no more than 0.020% P, 0.010～0.050% Nb, be no more than 40 * 10
-6n, be no more than 10 * 10
-6o, be no more than 3 * 10
-6h, and surplus Fe and inevitably impurity form; Described target molten steel is carried out to casting for shaped blank continuous, adopt the full guard casting during continuous casting; The rolling Hot Metal in Beam Blank, and guarantee that the depressing of finish to gauge (or claiming distortion), in austenite and ferrite two-phase region, then strengthened air cooling, to make wind-powered electricity generation H shaped steel.In the present invention, as the explanation without contrary, the content of each composition all means with weight percent.
Wind-powered electricity generation according to the present invention comprises by weight 0.14～0.22% C, 0.20～0.50% Si, 1.20～1.50% Mn, is no more than 0.010% S, is no more than 0.020% P, 0.010～0.050% Nb, is no more than 40 * 10 with H shaped steel
-6n, be no more than 10 * 10
-6o, be no more than 3 * 10
-6h, all the other are Fe and inevitable impurity.Preferably, wind-powered electricity generation of the present invention with H shaped steel by 0.14～0.18% C by weight, 0.20～0.30% Si, 1.20～1.40% Mn, be no more than 0.001～0.008% S, be no more than 0.001～0.020% P, 0.025～0.035% Nb, be no more than 40 * 10
-6n, be no more than 10 * 10
-6o, be no more than 3 * 10
-6h and the Fe of surplus and inevitably impurity form.Preferably, at wind-powered electricity generation of the present invention, use in H shaped steel, carbon equivalent ce V=C+Mn/6+ (Cr+Mo+V)/5+ (Cu+Ni)/15≤0.43, and manganese sulphur ratio is not less than 20.
Below describe the effect of each element in steel of the present invention or the reason of disadvantageous effect and selected limit in detail.
C is topmost gap solid solution element in soft steel, its lattice distortion caused is very strong, it is most economical strengthening element, but the increase along with its content, the plasticity of steel, toughness descend, welding property also worsens simultaneously, so consider its suitable content, is controlled at 0.14～0.22%.
Si is the displacement solid solution element in steel, is insoluble to cementite, only is present in ferrite, can play the effect of solution strengthening, but it can significantly worsen plasticity, improves ductile-brittle transition temperature, therefore, the content of Si is controlled to 0.20～0.50%.
Mn is the austenite stable element, and its existence can be stablized cold austenite, made Ar
3temperature reduces, thereby austenite-perlitic transformation temperature is reduced, and thinning microstructure, improve intensity and hardness.Simultaneously, the manganese in steel is easier to same S combination than Fe, avoids producing low melting point FeS, avoids producing hot-short, and the MnS of generation has good high-temp plastic, can be with the rolling homogeneous deformation.In the soft steel scope, the increase of manganese content significantly reduces the toughness of steel, and can affect carbon equivalent, worsens welding property, considers, and manganese content is fixed on to 1.20～1.50%.
S is the most serious element of segregation in steel, there is the interior tissue that has not only worsened steel in it, can form low melting point FeS simultaneously, produce hot-short, and in conjunction with the MnS produced, can, with the rolling homogeneous deformation, be to produce the main reason that Z-direction is torn, so S content be answered reduce with manganese, but consider desulphurization cost, it is controlled at below 0.010% and gets final product.
P is the element that in steel, segregation is only second to S, to improve other important element of banded structure level, a large amount of segregations are on crystal boundary, significantly improve the low temperature brittleness of steel, forming amorphous layer except assembling at steel surface improves the steel corrosion resisting property, without any positive impact, so P content should be controlled at below 0.020%.
Nb is the strong thin wafer element of effect in steel, induces in the process of separating out in rolling the stronger precipitation strength effect of also playing simultaneously.The elements such as Nb and C, N are combined in austenite grain boundary and form the anchoring effect, stop austenitic grain growth, thereby play the effect of grain refining.In addition, Nb can also improve the Ar3 temperature, makes the two-phase region rolling become and comparatively easily realizes.After Nb content surpasses 0.050%, strengthening effect no longer significantly increases, and is easy to form Low melting point eutectic with Fe, C etc., increases hot-short risk, therefore Nb content is controlled to 0.010～0.050%.
Below, will the exemplary embodiment of wind-powered electricity generation according to the present invention by the production method of H shaped steel be described.
In this exemplary embodiment, can realize production method of the present invention by the techniques such as hot metal pretreatment, top and bottom combined blown converter smelting, LF refining, casting for shaped blank continuous, two-phase region controlled rolling and strengthening air cooling of carrying out successively, to obtain wind-powered electricity generation H shaped steel according to the present invention.Particularly, according to the wind-powered electricity generation of this exemplary embodiment, by the production method of H shaped steel, can comprise the following steps:
(1) hot metal pretreatment
Carry out hot metal pretreatment to remove silicon and the sulphur in molten iron, make molten iron silicon content be controlled at 0.4～0.5%, sulphur content is controlled at 0.001～0.020%, and 1250～1300 ℃ of molten iron temperatures scratch clean the slag on molten iron surface after pre-treatment.
(2) top and bottom combined blown converter smelting
The process of carrying out top and bottom combined blown converter smelting mainly comprises: will after pretreated molten iron, in steel scrap, add in converter, the Intake Quantity error is at ± 0.5 ton, adopt the high method of once re-blowing of drawing, slag charge must add in terminal in first 3 minutes, finishing slag basicity is controlled in 3.0～3.2 scopes, terminal presses the rifle time to be not less than 1 minute, adopts the Si-Ca-Ba deoxidation, Si-Ca-Ba add-on 2.0～2.5kg/t
steel; Add 6～10kg/t along steel stream during tapping
steelsynthetic slag starts to be added at 3/4 o'clock and adds when putting steel 1/2; During tapping to 1/4, start evenly to add silicomanganese, Gao Meng, ferro-niobium to carry out deoxidation alloying, added to 3/4 o'clock.Synthetic slag is desulfurization, the dephosphorization slag charge containing CaO 85～95%, silicomanganese be siliceous 17%, containing the alloy of manganese 65%, add-on is the 7.5kg/t steel, high manganese is the iron alloy containing manganese 68%, add-on is 9.4kg/t
steel, ferrocolumbium is the iron alloy containing niobium 64%, add-on is 0.55kg/t
steel.
(3) LF refining
The LF refining adopts omnidistance Bottom Argon Stirring, and before departures, soft blow guarantees more than 12 minutes, adopts lime, calcium carbide slag making, and silicon carbide, barium are deoxidation, and departures sinciput slag is white slag or yellowish-white slag, finishing slag basicity 3.0～3.5.In addition, in the LF refining process, those of ordinary skills can be according to practical situation with 0.83～1.25kg/t
steelamount add the calcium iron wire in molten steel.
By above step (1) to (3), can obtain composition by 0.14～0.22% C by weight, 0.20～0.50% Si, 1.20～1.50% Mn, be no more than 0.010% S, be no more than 0.020% P, 0.010～0.050% Nb, be no more than 40 * 10
-6n, be no more than 10 * 10
-6o, be no more than 3 * 10
-6h, and surplus Fe and molten steel that inevitably impurity forms.Yet, the invention is not restricted to this, it will be understood by those skilled in the art that and can also obtain meeting by alternate manner the molten steel of mentioned component scope.For example, the step that can be combined with secondary refining by electrosmelting obtains meeting the molten steel that above-mentioned composition requires.In addition, preferably, for the production of wind-powered electricity generation of the present invention with the molten steel of H shaped steel by 0.14～0.18% C by weight, 0.20～0.30% Si, 1.20～1.40% Mn, be no more than 0.001～0.008% S, be no more than 0.001～0.020% P, 0.025～0.035% Nb, be no more than 40 * 10
-6n, be no more than 10 * 10
-6o, be no more than 3 * 10
-6h and the Fe of surplus and inevitably impurity form; To be defined as this preferred composition for molten steel of the present invention, and can accurately control each constituent content of steel, improve the yield rate of steel.
(4) casting for shaped blank continuous
In the casting for shaped blank continuous step, adopt the full guard casting, large water-coating port, submerged nozzle good seal, tundish adopts alkaline covering agent, and covering is good, adopts crystallizer protecting residue to cover the molten steel face of crystallizer.Alkaline covering agent can be H shaped steel continuous casting alkaline covering agent commonly used, for example, and the SiO that can use composition to comprise 2.9-3.1%
2, 40-42% MgO, the Al of 28-29% of CaO, 6-6.1%
2o
3, 1% left and right Fe
2o
3alkaline covering agent.The SiO that the composition of crystallizer protecting residue is 34～38%
2, 37～38% CaO, 9～10% Al
2o
3, 8～10% C and trace BaS, MgO, Fe
2o
3, MnO, Na
2o, K
2o and F, viscosity 8.8～9.3Pa.s, 1235～1255 ℃ of fusing points, basicity 1.29～1.35.In addition, casting speed can be 0.85～0.95m/min, and steel billet heat is sent.In production method of the present invention, the separating out to make of nitrogen, hydrogen is easy to occur strand subsurface bubble, pin hole in the casting for shaped blank continuous process, and in the operation of rolling, elongate, expansion, cause the finished product crack defect to occur; The control of oxygen level can significantly reduce inclusion content of steel, improve purity, for improving the steel substrate continuity, avoid occurring that detection defects has significant role, simultaneously, low oxygen level can change the form of manganese sulfide, make manganese sulfide to separate out at lower temperature, thereby obtain more tiny particle, can not form so thick and long sulfide in follow-up rolling elongation process, improved the Z-direction performance.Therefore, in the method for the invention, must, to carrying out the full guard cast in the casting for shaped blank continuous process, with the nitrogen control of element by steel, be no more than 40 * 10
-6, oxygen element is controlled at and is no more than 10 * 10
-6and protium is controlled at and is no more than 3 * 10
-6.
(5) two-phase region controlled rolling
In the rolling step, the temperature of controlled rolling is as follows: the temperature that steel billet goes out process furnace is 1200～1260 ℃, the start rolling temperature of rough rolling of steel billets is 1150～1200 ℃, the temperature that roughing finishes is 1040～1100 ℃, the start rolling temperature of finish rolling is 980～1010 ℃, the finish to gauge end temp is 820～840 ℃, and guarantees the depressing in austenite and ferrite two-phase region of finish to gauge.In the operation of rolling of production method of the present invention, the single pass draft can be controlled between 15～20% according to the specification difference of steel product.In addition, also can rolled blank a time before finish to gauge be treated to warm 60s according to process condition, with the finishing temperature of accurate controlled rolling base, make depressing in austenite and ferrite two-phase region of finish to gauge.In the finish to gauge process of finish rolling, if the finish to gauge end temp higher than the said temperature interval, can make austenite crystal again grow up fast, thereby the austenite crystal of abnormal growth, havoc product performance probably appear.In addition, in production method of the present invention, the temperature of each passage, especially finish to gauge, control lowlyer and accurate, and this is just for having rolled out performance better, more stable product provides guarantee.
(6) strengthening air cooling
In cooling step, by the strengthening air cooling, will for example be cooled to, below the temperature that its crystalline structure do not change (, 150 ℃) through Rolled Steel, form tiny crystal grain and good internal microstructure further to make steel.The rate of cooling of strengthening air cooling can be 4-6 ℃/s.Specifically, in production method of the present invention, the air-cooled measure of the strengthening that can take, on cold bed, adopt the blower fan strengthening cooling, further crystal grain thinning, be unlikely to again to produce large internal stress, avoids causing product design warpage, lateral bending simultaneously, and air-cooled more even than water-cooled, can avoid the larger fluctuation of product different zones performance.In addition, pay particular attention to, in process of cooling, can not will only be cooled between 500～600 ℃ through Rolled Steel, because, the stage that this temperature range is the most violent on the occasion of the steel phase transformation, may bring very large unrelieved stress, unfavorable for physical dimension and the toughness of product.
Wind-powered electricity generation of the present invention is as follows with the properties of H shaped steel: lower yield strength is not less than 400MPa, tensile strength is not less than 500MPa, elongation after fracture is not less than 24%,-20 ℃ of impact of collision merits (AKv) are not less than 180J, the Z-direction relative reduction in area is not less than 25%, the ultrasonic inspection rank is not less than 2.4 grades of European standards (being called for short Europe superscript), and the surface quality rank is not less than Europe superscript ClassC Sub class3.That is, wind-powered electricity generation of the present invention with H shaped steel there is good low-temperature impact toughness and strength coordination, possess good internal soundness and anti-lamellar tearing performance, good surface quality and good corrosion resisting property, can meet the requirement of wind-power electricity generation to high performance steel.
Here, the Z-direction relative reduction in area refers to the relative reduction in area of thickness of steel product direction, describes the index of anti-lamellar tearing performance, and this value is larger, illustrates that thickness of steel product direction plasticity, toughness are better, more are difficult for being torn under stress.The testing method of Z-direction relative reduction in area is at two auxiliary steel of thickness of steel product direction both sides butt welding, avoid destroying the original structure of steel to be checked in welding process, and carry out on request tension test, the relative reduction in area that obtains these steel is anti-lamellar tearing performance, and the content of this performance and manganese sulfide and finish to gauge state have direct relation.2.4 grades of other flaw detections of Europe superscript require: by the whole edges of a wing to H shaped steel, after web is detected, for the defect detected (comprise disappearance and be mingled with), for dimension width more than 8mm, length being counted more than 15mm, for the zone of surveying, the local every square meter of the defect of size must not be over 10 like this, totally must not be over 5, for occurring that defect area can't stand fully in the situation more than 500 square millimeters, the defect size of considering will be got union and consider, be greater than 15mm and all will be counted as long as width is greater than 8mm or length.The surface quality of Europe superscript ClassC Sub class3 requires: according to the specification of product, stipulated the degree of depth restriction of different thickness (comprising the edge of a wing and web) condition lower surface defect, and if there is such defect should be repaired and how to be repaired according to which kind of method, H shaped steel that for example will production edge of a wing thickness 24mm, the full depth of its surface imperfection must not surpass 1.7mm so, if surpass this value, according to above-mentioned ClassC Sub class3, requires can not carry out repair by welding.
Below in conjunction with concrete example, wind-powered electricity generation according to the present invention is described further with H shaped steel and production method thereof, but wind-powered electricity generation of the present invention is not limited to this with H shaped steel and production method thereof.
example 1
In this example, wind-powered electricity generation with H shaped steel by hot metal pretreatment, top and bottom combined blown converter smelting, LF refining, BB1 casting for shaped blank continuous, two-phase region controlled rolling with roll rear strengthening air cooling and produce.Details are as follows.
Desulfurizing iron desiliconization strict implement technological process, sulphur is controlled at 0.013%, and silicon is controlled at 0.46%, and temperature is controlled at 1280 ℃.Add converter in 8 tons of high-quality steel scraps after molten iron, slag material adds in terminal in first 3 minutes, finishing slag basicity 3.2, and oxygen supply time 16 minutes and 40 seconds, terminal is pressed rifle 70 seconds, 4 minutes and 24 seconds tapping time.First adopt the silicomanganese deoxidation, add-on is 7.5kg/t
steel, then to add Si-Ca-Ba deoxidation, add-on be 2.2kg/t
steel, with steel stream, adding, 1/2 beginning to 3/4 of tapping adds.Start to add Gao Meng, ferro-niobium, carbon dust during tapping to 1/4 in batches, add to 3/4.Molten steel through converter smelting enters the LF refining furnace, adds lime, fluorite to carry out slag making, causes white slag or the yellowish-white slag of good fluidity, adopts omnidistance Bottom Argon Stirring, 12 minutes soft blow time, and finishing slag basicity 3.2, calcium iron wire add-on is the 1.20kg/t steel.Through after said process, the molten steel composition obtained is by weight by 0.17% C, 0.30% Si, 1.32% Mn, 0.009% S, 0.014% P, 0.031% Nb, 32 * 10
-6n, 8 * 10
-6o, 2.3 * 10
-6h and the Fe of surplus and inevitably impurity form.
Then, the molten steel of above-mentioned composition is carried out to the full guard casting for shaped blank continuous, tundish covering flux is used H shaped steel continuous casting alkaline covering agent commonly used; adopt crystallizer protecting residue to cover mold liquid level; the weak cold pattern of two cold employings, stationary phase, pulling rate was 0.88m/min, casting blank specification is BB1.In this example, the SiO that the composition of crystallizer protecting residue is 35%
2, 37% CaO, 10% Al
2o
3, 10% C and BaS, MgO, the Fe of surplus
2o
3, MnO, Na
2o, K
2o and F, viscosity 9.0Pa.s, 1250 ℃ of fusing points, basicity 1.33.
Continuous casting strand direct heat out is fed into process furnace, the steel billet tapping temperature is 1250 ℃, 1155 ℃ of roughing start rolling temperatures, 1060 ℃ of finish to gauge end temps, the finish rolling start rolling temperature is 1000 ℃, the finish to gauge end temp is 830 ℃, and before finish to gauge, a time is treated warm 60s, guarantees depressing in two-phase region of finish to gauge.Roll rear steel and strengthened air cooling, speed of cooling is 4-6 ℃/s.
The wind-powered electricity generation that this example is obtained is detected with H shaped steel, obtain this H shaped steel performance as follows: lower yield strength is 412MPa, tensile strength is 528MPa, elongation after fracture is 26%,-20 ℃ of impact of collision merits (AKv) are 210J, the Z-direction relative reduction in area is 30%, and ultrasonic inspection is superior to 2.4 grades of Europe superscripts, and surface quality is superior to Europe superscript ClassC Sub class3.
example 2
In this example, wind-powered electricity generation with H shaped steel by hot metal pretreatment, top and bottom combined blown converter smelting, LF refining, BB1 casting for shaped blank continuous, two-phase region controlled rolling with roll rear strengthening air cooling and produce.Details are as follows.
Desulfurizing iron desiliconization strict implement technological process, sulphur is controlled at 0.017%, and silicon is controlled at 0.44%, and temperature is controlled at 1280 ℃.Add converter in 8.9 tons of high-quality steel scraps after molten iron, slag material adds in terminal in first 3 minutes, finishing slag basicity 3.2, and oxygen supply time 16 minutes and 41 seconds, terminal is pressed rifle 72 seconds, 4 minutes and 20 seconds tapping time.First adopt the silicomanganese deoxidation, add-on is 7.6kg/t
steel, then to add Si-Ca-Ba deoxidation, add-on be 2.2kg/t
steel, with steel stream, adding, 1/2 beginning to 3/4 of tapping adds.Start to add Gao Meng, ferro-niobium, carbon dust during tapping to 1/4 in batches, add to 3/4.Molten steel through converter smelting enters the LF refining furnace, adds lime, fluorite to carry out slag making, causes white slag or the yellowish-white slag of good fluidity, adopts omnidistance Bottom Argon Stirring, 12 minutes soft blow time, and finishing slag basicity 3.2, calcium iron wire add-on is the 1.20kg/t steel.Through after said process, the molten steel composition obtained is by weight by 0.16% C, 0.29% Si, 1.29% Mn, 0.008% S, 0.016% P, 0.030% Nb, 37 * 10
-6n, be no more than 7 * 10
-6o, 1.9 * 10
-6h and the Fe of surplus and inevitably impurity form.
Then, the full guard casting for shaped blank continuous is carried out to, the H shaped steel continuous casting alkaline covering agent that tundish covering flux is commonly used in the molten steel of above-mentioned composition; adopt crystallizer protecting residue to cover mold liquid level; the weak cold pattern of two cold employings, stationary phase, pulling rate was 0.90m/min, casting blank specification is BB1.In this example, the SiO that the composition of crystallizer protecting residue is 34%
2, 38% CaO, 13% Al
2o
3, 11% C and BaS, MgO, the Fe of surplus
2o
3, MnO, Na
2o, K
2o and F, viscosity 9.2Pa.s, 1236 ℃ of fusing points, basicity 1.27.
Continuous casting strand direct heat out is fed into process furnace, the steel billet tapping temperature is 1250 ℃, 1160 ℃ of roughing start rolling temperatures, 1060 ℃ of finish to gauge end temps, the finish rolling start rolling temperature is 1005 ℃, the finish to gauge end temp is 835 ℃, and before finish to gauge, a time is treated warm 60s, guarantees depressing in two-phase region of finish to gauge.Roll rear steel and strengthened air cooling, speed of cooling is 4-6 ℃/s.
The wind-powered electricity generation that this example is obtained is detected with H shaped steel, obtain this H shaped steel performance as follows: lower yield strength is 421MPa, tensile strength is 530MPa, elongation after fracture is 26%,-20 ℃ of impact of collision merits (AKv) are 198J, the Z-direction relative reduction in area is 30%, and ultrasonic inspection is superior to 2.4 grades of Europe superscripts, and surface quality is superior to Europe superscript ClassC Sub class3.
example 3
In this example, wind-powered electricity generation with H shaped steel by hot metal pretreatment, top and bottom combined blown converter smelting, LF refining, BB1 casting for shaped blank continuous, two-phase region controlled rolling with roll rear strengthening air cooling and produce.Details are as follows.
Desulfurizing iron desiliconization strict implement technological process, sulphur is controlled at 0.016%, and silicon is controlled at 0.45%, and temperature is controlled at 1270 ℃.Add converter in 8.3 tons of high-quality steel scraps after molten iron, slag material adds in terminal in first 3 minutes, finishing slag basicity 3.2, and oxygen supply time 16 minutes and 21 seconds, terminal is pressed rifle 69 seconds, 4 minutes and 45 seconds tapping time.First adopt the silicomanganese deoxidation, add-on is 7.7kg/t
steel, then to add Si-Ca-Ba deoxidation, add-on be 2.2kg/t
steel, with steel stream, adding, 1/2 beginning to 3/4 of tapping adds.Start to add Gao Meng, ferro-niobium, carbon dust during tapping to 1/4 in batches, add to 3/4.Molten steel through converter smelting enters the LF refining furnace, adds lime, fluorite to carry out slag making, causes white slag or the yellowish-white slag of good fluidity, adopts omnidistance Bottom Argon Stirring, 12 minutes soft blow time, and finishing slag basicity 3.2, calcium iron wire add-on is 1.20kg/t
steel.Through after said process, the molten steel composition obtained is by weight by 0.16% C, 0.34% Si, 1.33% Mn, 0.007% S, 0.015% P, 0.027% Nb, 35 * 10
-6n, 4 * 10
-6o, 2.7 * 10
-6h and the Fe of surplus and inevitably impurity form.
Then, the full guard casting for shaped blank continuous is carried out to, the H shaped steel continuous casting alkaline covering agent that tundish covering flux is commonly used in the molten steel of above-mentioned composition; adopt crystallizer protecting residue to cover mold liquid level; the weak cold pattern of two cold employings, stationary phase, pulling rate was 0.87m/min, casting blank specification is BB1.In this example, the SiO that the composition of crystallizer protecting residue is 37%
2, 35% CaO, 10% Al
2o
3, 11% C and BaS, MgO, the Fe of surplus
2o
3, MnO, Na
2o, K
2o and F, viscosity 9.0Pa.s, 1250 ℃ of fusing points, basicity 1.30.
Continuous casting strand direct heat out is fed into process furnace, the steel billet tapping temperature is 1250 ℃, 1165 ℃ of roughing start rolling temperatures, 1060 ℃ of finish to gauge end temps, the finish rolling start rolling temperature is 1000 ℃, the finish to gauge end temp is 825 ℃, and before finish to gauge, a time is treated warm 60s, guarantees depressing in two-phase region of finish to gauge.Roll rear steel and strengthened air cooling, speed of cooling is 4-6 ℃/s.
The wind-powered electricity generation that this example is obtained is detected with H shaped steel, obtain this H shaped steel performance as follows: lower yield strength is 418MPa, tensile strength is 526MPa, elongation after fracture is 26%,-20 ℃ of impact of collision merits (AKv) are 208J, the Z-direction relative reduction in area is 31%, and ultrasonic inspection is superior to 2.4 grades of Europe superscripts, and surface quality is superior to Europe superscript ClassC Sub class3.
Sample in the H of example 1 section steel flange 1/3 position and carry out microtexture research, Fig. 1 is shown in by its metallographic structure photo.Therefrom can find out its be organized as typical ferrite+perlite (that is, and F+P) tissue, wherein, ferrite crystal grain is fine and closely woven, grain fineness number reaches 9.5 grades, without banded structure.These advantageous feature are owing to reasonable component design and accurate two-phase region controlled rolling and roll rear rational process for cooling, given full play to the thin brilliant effect of Nb, coordinate its effect that improves the two-phase region controlled rolling, also improved its impelling strength when improving steel strength; The low-sulfur Composition Control has guaranteed that the size of sulfide inclusion and quantity, all in extremely low-level, have improved its anti-lamellar tearing performance, is equipped with low-phosphorous control and has guaranteed the appearance without banded structure; The full guard casting is effectively controlled the content of overall gas impurity, has guaranteed good internal soundness.Above-mentioned some guaranteed that H shaped steel of the present invention has obtained good obdurability coupling, anti-lamellar tearing performance and excellent inside, surface quality, thereby H shaped steel of the present invention can meet the structural steel requirement of wind energy turbine set.
In sum, H shaped steel of the present invention does not need through Overheating Treatment, and its crystal grain is tiny, homogeneous microstructure, there is superior comprehensive mechanical property, not easy fracture, be difficult for tearing and be difficult for destroyed, safe and reliable, can meet coastal generating field structure building demand, also can be used as the wind-powered electricity generation structure iron of high and cold desert area simultaneously.
Although the above has described H shaped steel and production method thereof for wind-powered electricity generation of the present invention with exemplary embodiment by reference to the accompanying drawings, but those of ordinary skills should be clear, in the situation that do not break away from the spirit and scope of claim, can carry out various modifications to above-described embodiment.
Claims (5)
1. the production method of a wind-powered electricity generation use H shaped steel, is characterized in that, described production method comprises the following steps:
Smelting molten steel to be to obtain the target molten steel, the composition of described target molten steel by 0.14～0.22% C by weight, 0.20～0.50% Si, 1.20～1.50% Mn, be no more than 0.010% S, be no more than 0.020% P, 0.010～0.050% Nb, be no more than 40 * 10
-6n, be no more than 10 * 10
-6o, be no more than 3 * 10
-6h, and surplus Fe and inevitably impurity form;
Described target molten steel is carried out to casting for shaped blank continuous, adopt the full guard casting during continuous casting;
Rolling Hot Metal in Beam Blank, and guarantee the depressing in austenite and ferrite two-phase region of finish to gauge, then strengthened air cooling being cooled to below the temperature that its crystalline structure do not change through Rolled Steel, to make wind-powered electricity generation H shaped steel,
Wherein, described rolling step comprises roughing and finish rolling, and the start rolling temperature of roughing is 1150～1200 ℃, the temperature that roughing finishes is 1040～1100 ℃, the start rolling temperature of finish rolling is 980～1010 ℃, and the finish to gauge end temp is 820～840 ℃, and the rate of cooling of described strengthening air cooling is 4-6 ℃/s.
2. the production method of H shaped steel for wind-powered electricity generation according to claim 1; it is characterized in that; when the full guard cast in described continuous casting step is included in casting, ladle nozzle and submerged nozzle are sealed; adopt alkaline covering agent to cover pouring basket liquid level, and adopt crystallizer protecting residue to cover mold liquid level.
3. the production method of H shaped steel for wind-powered electricity generation according to claim 1, it is characterized in that, C content in described target molten steel is 0.14～0.18%, Si content is 0.20～0.30%, Mn content is 1.20～1.40%, S content is that 0.001～0.008%, P content is that 0.001～0.020%, Nb content is 0.025～0.035%.
4. the production method with H shaped steel according to the described wind-powered electricity generation of claim 1 or 3, is characterized in that the carbon equivalent ce V=C+Mn/6+(Cr+Mo+V of described target molten steel)/5+(Cu+Ni)/15≤0.43, and manganese sulphur ratio is not less than 20.
5. a wind-powered electricity generation H shaped steel, is characterized in that, described wind-powered electricity generation adopts the described method of any one in claim 1 to 4 to make with H shaped steel.
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| CN104789857A (en) * | 2015-04-13 | 2015-07-22 | 内蒙古包钢钢联股份有限公司 | Low-cost 235 MPa grade low-temperature hot-rolling H section steel and preparation method thereof |
| EP3597783B1 (en) * | 2017-03-15 | 2022-06-08 | Nippon Steel Corporation | H-section steel and method of producing the same |
| CN107557681B (en) * | 2017-08-02 | 2019-05-17 | 邢台钢铁有限责任公司 | A kind of middle low carbon steel wire rod and its production method with excellent deformation performance |
| CN112795755B (en) * | 2020-12-30 | 2022-06-07 | 日照钢铁控股集团有限公司 | Method for flexibly producing low-alloy high-strength hot-rolled H-shaped steel |
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| CN1206048C (en) * | 2002-09-30 | 2005-06-15 | 马鞍山钢铁股份有限公司 | Rolling process of H-shaped niobium-containing steel |
| CN101407888A (en) * | 2008-05-06 | 2009-04-15 | 首钢总公司 | Steel for tower frame structure of wind power generator and production method thereof |
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