CN100491574C - C-Mn-Ti-Nb series hot-rolled high strength high magnetic induction performance steel and manufacturing method thereof - Google Patents

C-Mn-Ti-Nb series hot-rolled high strength high magnetic induction performance steel and manufacturing method thereof Download PDF

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CN100491574C
CN100491574C CNB2007100512512A CN200710051251A CN100491574C CN 100491574 C CN100491574 C CN 100491574C CN B2007100512512 A CNB2007100512512 A CN B2007100512512A CN 200710051251 A CN200710051251 A CN 200710051251A CN 100491574 C CN100491574 C CN 100491574C
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rolled
hot
strength
steel
magnetic induction
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CNB2007100512512A
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Chinese (zh)
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CN101016600A (en
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郭斌
苏毅
刘昌明
郑琳
谢懋亮
鄢檀力
陈洪伟
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武汉钢铁(集团)公司
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Abstract

The invention discloses a preparing method of C-Mn-Ti-Nb system hot-rolled high-intensity and high magnetic property steel in microalloy steel producing domain, which comprises the following steps: a, allocating mass percent of each element as 0.03%-0.15% C, Si<=0.15%, 1.00%-1.80% Mn, P<=0.025%, S<=0.015%, 0.08%-0.18% Ti, 0.02%-0.07% Nb, 0.02%-0.10% Al, N<=0.010% and Fe; desulfurizing with iron melt; b, composite-blowing converter top and bottom; c, blowing argon gas from rear; d, casting to bar plate; e, choosing hot-continuous rolling mill device; heating the bar plate from step d at 1230-1280 deg.c; roughing down with the ending temperature at >=1100 deg.c; planishing with the ending temperature at 850-930 deg.c; cooling with lamellar flow; winding with the temperature at 550-620 deg.c; getting the product.

Description

C-Mn-Ti-Nb series hot-rolled high strength high magnetic induction performance steel and manufacture method thereof
Technical field
The present invention relates to microalloyed steel and make the field, refer to particularly a kind of be adapted to large-sized water turbine generator rotor rim part required possess high strength (R EL〉=700MPa) and the steel and the manufacture method thereof of high magnetic induction performance.
Background technology
Along with becoming increasingly conspicuous of imbalance between power supply and demand, become the important behave that China solves energy problem as cleanliness without any pollution, reproducible water power.Along with going deep into of China's development of the West Regions, large-scale, the huge hydroelectric project of large quantities of Three Gorges level will put into operation in coming few decades successively, these large-scale, huge hydroelectric projects all need single-machine capacity 70~800,000 other Large Hydroelectric Set of kilowatt level, and this has just proposed the requirement of high strength, high magnetic induction performance with steel to generator amature yoke wherein part.Before the present patent application, the patent No. is that 98800888.2 Chinese invention patent has been put down in writing a kind of " producing the method for the preferable grain orientation electrical sheet with high magnetic flux density based on low temperature slab heating method ", it is longer that its composition and process system weak point are to produce line, be annealed into cold-rolled steel sheet from hot-rolled steel sheet, also need to carry out carbonization treatment at last, production cycle is long, energy consumption is big, and steel plate contains silicon (Si) or a certain amount of copper (Cu) of high level, nickel (Ni), chromium (Cr), boron (B), cost of alloy is higher, and this invention simultaneously relates to kind and do not possess high tensile strength.Application number is that 200480002119.7 Chinese invention patent has been introduced a kind of " ultrahigh strength hot-rolled steel and the method for producing band ", its composition and process system weak point are to contain 0.5%~1.0% chromium (Cr), and need in the production technique rolling temperature is controlled at and be lower than 950 ℃, be cooled to 400 ℃ or low temperature more then, remain on the rate of cooling between 800 ℃ and 700 ℃ therebetween greater than 50 ℃/S, at last at 250 ℃ or more reel under the low temperature, this Capability Requirement for milling train and taking-up equipment is high, and it is bigger to equipment damage, do not have operability, this patent relates to kind and does not possess high magnetic induction performance simultaneously.
Summary of the invention
Higher for solving the existing in prior technology cost, and to problem rolling and that the taking-up equipment infringement is bigger, the invention provides yield strength ReL 〉=700MPa that yoke is partly used in a kind of large-sized water turbine generator rotor that can satisfy high single-machine capacity, the high strength and magnetic induction property steel of magnetic induction performance B50 〉=1.5T and manufacture method thereof.
For achieving the above object, the C-Mn-Ti-Nb series hot-rolled high strength high magnetic induction performance steel that the present invention is designed, it comprises carbon (C), silicon (Si), manganese (Mn), phosphorus (P), sulphur (S), titanium (Ti), niobium (Nb), aluminium (Al), nitrogen (N) and iron (Fe), the weight percent of each component is C:0.03%~0.15%, Si :≤0.15%, Mn:1.00%~1.80%, P :≤0.025%, S :≤0.015%, Ti:0.08%~0.18%, Nb:0.02%~0.07%, Al:0.02%~0.10%, N :≤0.010%, all the other inevitably are mingled with for Fe reaches.
The mechanism of action of each alloy ingredient is as follows in the C-Mn-Ti-Nb series hot-rolled high strength high magnetic induction performance steel of the present invention:
Carbon of the present invention (C) content is 0.03%~0.15%, carbon is one of element of indispensable raising steel strength in the steel, can form the microalloy carbide with effects such as Ti, Nb in the steel simultaneously, play the precipitation strength effect, the too high meeting of carbon content has influence on the magnetic induction performance of steel.Carbon content is limited to 0.03~0.15%, both can have improved the intensity of steel, guarantee the magnetic induction performance of steel, be fit to production operation again.
Manganese of the present invention (Mn) content is 1.00%~1.80%, can reduce austenitic transformation and become ferritic transformation temperature, enlarges the hot processing temperature zone, helps the refinement ferrite grain size, improves the yield strength and the tensile strength of steel.
Phosphorus of the present invention (P) content≤0.025%, sulphur (S) content≤0.015%, phosphorus have disadvantageous effects such as causing segregation, reduction magnetic induction performance easily in steel.Sulphur easily combines generation MnS and is mingled with manganese, influence the magnetic induction performance and the plasticity of steel.Therefore, the present invention should reduce as far as possible phosphorus, element sulphur to rigidity can disadvantageous effect, by molten iron being carried out means such as dark desulfurization pre-treatment, control phosphorus, sulphur content, thereby alleviate its disadvantageous effect.
Silicon of the present invention (Si) content≤0.15%, silicon has disadvantageous effect to hot continuous rolling coiled sheet surface quality, so the present invention should reduce silicone content in the steel as far as possible.
Titanium of the present invention (Ti) content is 0.08%~0.18%, titanium is a kind of intensive carbide and nitride forming element, in reheating, steel stop austenite crystal to be grown up, TiN and TiC separate out when the roughing of high temperature austenite district, can effectively suppress austenite crystal and grow up, TiN that separates out simultaneously and TiC can effectively improve armor plate strength.
Niobium of the present invention (Nb) content is 0.02%~0.07%, and the niobium of trace is crystal grain thinning and improve the tensile strength of steel of the present invention significantly.Niobium is in the controlled rolling process, and by inhibition recrystallize and prevention grain growth, but the refine austenite grain-size improves steel plate recrystallization temperature simultaneously, reduces mill load.In rolling the postcooling process, the small particle of NbC and NbN is separated out, and can play precipitation strength.
Aluminium of the present invention (Al) content is 0.02~0.10%, and it mainly acts on is the oxygen of sloughing in the molten steel, prevents that titanium is oxidized and loses efficacy.
Nitrogen of the present invention (N) content≤0.01% belongs to normal remaining in the converter steel, can combine formation TiN, NbN with titanium in the steel (Ti), niobium (Nb) and separate out, and plays the inhibition austenite crystal and grows up and the precipitation strength effect.
The manufacture method of above-mentioned C-Mn-Ti-Nb series hot-rolled high strength high magnetic induction performance steel is undertaken by following step: a, desulfurizing iron; B, converter top bottom blowing; Blowing argon gas is handled behind c, the stove; D, pour into slab; E, hot continuous mill controlled rolling and controlled cooling.Wherein, described hot continuous rolling controlled rolling and controlled cooling carries out at the hot continuous rolling unit, earlier the prepared slab of steps d is heated to 1230~1280 ℃; Roughing then, roughing end temp are 〉=1100 ℃; Finish rolling then, finishing temperature are 850~930 ℃; Steel plate rolls and batches after the laminar flow cooling is adopted in the back, and coiling temperature is 550~620 ℃, makes hot-rolled sheet coil.
C-Mn-Ti-Nb series hot-rolled high strength high magnetic induction performance steel of the present invention does not contain copper (Cu), nickel (Ni), chromium (Cr), boron compositions such as (B), and cost greatly economizes in raw materials; And rolling temperature and coiling temperature are higher, can reduce steel plate deformation drag, and ((ReL 〉=700MPa) reduce machine utilization in the steel process has reduced the infringement to rolling equipment and taking-up equipment to 1.6~5mm) superstrengths in rolling thin specification.Test shows, the yield strength ReL of C-Mn-Ti-Nb series hot-rolled high strength high magnetic induction performance steel of the present invention 〉=700MPa, tensile strength Rm 〉=800MPa, magnetic induction performance B50 〉=1.50T can satisfy the demand of the large-sized water turbine generator rotor rim of high single-machine capacity with high strength and magnetic induction property steel.
Embodiment
Below in conjunction with specific embodiment C-Mn-Ti-Nb series hot-rolled high strength high magnetic induction performance steel of the present invention and production method thereof are described in further detail:
The chemical ingredients of table 1 steel of the present invention, wt%
Composition C Si Mn P S Ti Al Nb N
1 0.071 0.069 1.646 0.012 0.006 0.129 0.048 0.045 0.009
2 0.083 0.029 1.656 0.017 0.003 0.124 0.058 0.043 0.002
3 0.100 0.028 1.718 0.017 0.006 0.131 0.051 0.043 0.006
Table 1 has been listed the present invention and can be used for the Chemical Composition of large-sized water turbine generator rotor rim with several specific exampless of steel.
These several high strength and magnetic induction properties are as follows with the production method of steel: at first, adopt the dark desulfurization technology of molten iron, in converter, carry out top bottom blowing, make S≤0.005% in the molten iron, molten steel is behind stove in the blowing argon gas treating processes, carry out microalloying, make Chemical Composition in the steel satisfy the requirement of table 1, surplus is Fe and inevitably is mingled with; Then, the pouring molten steel that satisfies table 1 requirement is become the slab of 200~300mm * 900~1550mm section; At last, the hot continuous rolling production technique with this slab adopts controlled rolling and controlled cooling to handle on hot continuous mill is rolled into hot-rolled sheet with it.
When adopting the hot continuous rolling production technique of controlled rolling and controlled cooling processing, for giving full play to the effect of microalloy element in steel and dimensions, the surface quality of assurance steel plate, utilize high-power milling train (3/4 continous way hot strip mill group, the single chassis peak power is more than the 5000kw) capacity of equipment, reduce rolling pass, improve percentage pass reduction.Earlier slab is heated to 1230~1280 ℃.Roughing accumulative total draft is 80~90%, and the roughing end temp is 〉=1100 ℃.Carry out finish rolling after the roughing, finishing temperature is 850~930 ℃; Batch after the laminar flow cooling, coiling temperature is 550~620 ℃, makes the hot-rolled sheet that thickness of slab is 1.6~5mm.
The processing parameter and the test-results of the hot-rolled sheet of C-Mn-Ti-Nb series hot-rolled high strength high magnetic induction performance steel of the present invention see Table 2.
Table 2 steel hot-rolling plate of the present invention preparation method and test-results
Annotate: the composition 1,2,3 of table 2 and the composition 1,2,3 in the table 1 are corresponding relation.
Embodiment has enumerated the C-Mn-Ti-Nb series hot-rolled high strength high magnetic induction performance steel of three kinds of compositions, corresponds respectively to the composition 1,2,3 in the table 1.The hot-rolled sheet explained hereafter press in test, two kinds of specifications thicker and that approach that wherein composition 1 is rolling.From the performance that table 2 reflects, 1.6~5mm hot-rolled sheet of each composition can both satisfy yield strength R EL〉=700MPa, magnetic induction performance B 50〉=1.50T.

Claims (5)

1, C-Mn-Ti-Nb series hot-rolled high strength high magnetic induction performance steel, it is characterized in that it is made up of C, Si, Mn, P, S, Ti, Nb, Al, N and Fe, the weight percent of each component is C:0.03%~0.15%, Si :≤0.15%, Mn:1.646%~1.80%, P: S≤0.025% :≤0.015%, Ti:0.08%~0.18%, Nb:0.02%~0.07%, Al:0.02%~0.10%, N :≤0.010%, and all the other are Fe.
2, C-Mn-Ti-Nb series hot-rolled high strength high magnetic induction performance steel according to claim 1, the weight percent that it is characterized in that each component is C:0.071%, Si:0.069%, Mn:1.646%, P:0.012%, S:0.006%, Ti:0.129%, Nb:0.045%, Al:0.048%, N :≤0.009%, and all the other are Fe.
3, C-Mn-Ti-Nb series hot-rolled high strength high magnetic induction performance steel according to claim 1, the weight percent that it is characterized in that each component is C:0.083%, Si:0.029%, Mn:1.656%, P:0.017%, S:0.003%, Ti:0.124%, Nb:0.043%, Al:0.058%, N :≤0.002%, and all the other are Fe.
4, C-Mn-Ti-Nb series hot-rolled high strength high magnetic induction performance steel according to claim 1, the weight percent that it is characterized in that each component is C:0.10%, Si:0.028%, Mn:1.718%, P:0.017%, S:0.006%, Ti:0.131%, Nb:0.043%, Al:0.051%, N :≤0.006%, and all the other are Fe.
5,, it is characterized in that it is undertaken by following step: a, desulfurizing iron according to the manufacture method of claim 1,2,3 or 4 described C-Mn-Ti-Nb series hot-rolled high strength high magnetic induction performance steels; B, converter top bottom blowing; Blowing argon gas is handled behind c, the stove; D, pour into slab; E, hot continuous mill controlled rolling and controlled cooling: select hot continuous rolling unit equipment for use, earlier the prepared slab of steps d is heated to 1230~1280 ℃; Roughing then, roughing end temp are 〉=1100 ℃; Finish rolling then, finishing temperature are 850~930 ℃; Steel plate rolls and batches after the laminar flow cooling is adopted in the back, and coiling temperature is 550~620 ℃, makes hot-rolled sheet coil.
CNB2007100512512A 2007-01-12 2007-01-12 C-Mn-Ti-Nb series hot-rolled high strength high magnetic induction performance steel and manufacturing method thereof CN100491574C (en)

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