CN105256234A - Low-carbon microalloyed steel, preparing method and application of low-carbon microalloyed steel, ventilator blade and ventilator - Google Patents
Low-carbon microalloyed steel, preparing method and application of low-carbon microalloyed steel, ventilator blade and ventilator Download PDFInfo
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Abstract
The invention discloses low-carbon microalloyed steel, a preparing method and application of the low-carbon microalloyed steel, a ventilator blade and a ventilator and belongs to the technical field of metallurgy. The steel comprises, by weight, 0.05-0.09% of C, 0.10-0.20% of Si, 1.05-1.25% of Mn, smaller than or equal to 0.015% of P, smaller than or equal to 0.005% of S, 0.020-0.050% of Al, 0.05-0.09% of Ti, smaller than or equal to 0.0060% of N and the balance Fe and inevitable impurities. The preparing method includes the steps that a casting blank is heated to 1200-1260 DEG C, and the heat insulation time of a slab is 3.0-4.0 h; the time of the slab at the temperature of 1200-1260 DEG C is longer than or equal to 40 minutes; the accumulated deformation of rough rolling is larger than 75%; the thickness of an intermediate slab or the thickness of a finished product is larger than or equal to 3, the temperature of a finish rolling inlet is 960-1060 DEG C, the reduction rate of the last gate of finish rolling is larger than or equal to 8%, and the finishing rolling temperature is 820-860 DEG C; and the rolling temperature is 550-630 DEG C. The steel prepared through the method has good low-temperature toughness and heat resisting performance and is mainly used for the ventilator blade. When the steel is applied to the blade and assembled into the ventilator, the use requirement of the blade can be met.
Description
Technical field
The present invention relates to metallurgical technology field, particularly relate to a kind of low-carbon micro steel-alloy, Preparation Method And The Use, ventilating vane, ventilator.
Background technology
Ventilating vane is the major parts of ventilator, and blade, as fan unit most critical, most crucial parts, is the important factor ensureing that unit normal table runs.The Service Environment of ventilating vane is more complicated, has very high requirement to steel, except requiring to have except high intensity, excellent low-temperature flexibility, also requires high wear resistance, high fatigue lifetime, creep resisting ability, thermotolerance and good welding property etc.
For ventilator, its blade mainly adopts ferrous materials, high-end ventilating vane mainly adopts the high-strength alloy steel of import, as HALDOX400, WELDOX700, WELDOX900 etc. that SSAB company of Sweden produces, efficiently solves ventilator reliability of operation problem; The selection and comparison of common ventilating vane steel is extensive, low-carbon bainite steel HQ785 performance and the WELDOX700 of such as Anshan iron and steel plant production are similar, and at steel mill's coal gas ventilator, application in the impeller making of multiple projects such as cement mill high temperature ventilator, centrifugal fan.The low-carbon bainite steel Q550CFD over-all properties that Sha Gang produces is stablized, and low-welding crack-sensitive, be applied in Centrifugal Fan Impeller and manufactured.Wuhan Iron and Steel Plant is a kind of welded high-strength structure low-carbon bainite steel plate at exploitation HG785 material in 2003, this steel is mainly used in various weldment or the pressure-containing member that working temperature is no more than 400 DEG C, has been successfully applied to the impeller vane materials such as large scale sintering backheat ventilator, pelletizing ventilator, cement high temperature kiln tail ventilator.But add price Nb costly in the Composition Design of these steel, the elements such as Mo, adopt controlled rolling and controlled cooling heat treated to produce, its complex procedures, cost is higher.
Summary of the invention
In view of this, the invention provides a kind of there is superior low-temperature toughness and resistance toheat low-carbon micro steel-alloy, and preparation method thereof, apply the ventilating vane that this low-carbon micro steel-alloy obtains, the ventilator comprising this ventilating vane.
In order to achieve the above object, the present invention mainly provides following technical scheme:
Low-carbon micro steel-alloy chemical component weight per-cent provided by the invention is respectively: C:0.05 ~ 0.09%; Si:0.10 ~ 0.20%; Mn:1.05 ~ 1.25%; P :≤0.015; S :≤0.005%; Al:0.020 ~ 0.050%; Ti:0.05 ~ 0.09%; N :≤0.0060; All the other are Fe and inevitable impurity.
As preferably, in the steel plate of described low-carbon micro steel-alloy, the span of TiC precipitated phase mean sizes is 5 ~ 10nm.
The preparation method of low-carbon micro steel-alloy provided by the invention, comprises the following steps successively: KR desulfurization → complete three take off converter smelting → LF refining → continuous casting → reheat → roughing → finish rolling → section cooling → batch;
The processing parameter of each step is respectively:
Strand is heated to 1200 ~ 1260 DEG C, slab soaking time 3.0 ~ 4.0h; Slab be in 1200 ~ 1260 DEG C time >=40 minutes;
Roughing and finish rolling adopt two-stage control rolling, and roughing adopts 5 passes, accumulative deflection > 75%; Workpiece thickness/finished product thickness >=3, entry temperature at finishing is 960 ~ 1060 DEG C, and finish rolling adopts 7 passes, last percentage pass reduction >=8%, and finishing temperature is 820 ~ 860 DEG C; Coiling temperature is 550 ~ 630 DEG C.
As preferably, described coiling temperature is 570 ~ 620 DEG C.
As preferably, described roller repairing adopts front end to concentrate cooling mode to carry out section cooling.
Low-carbon micro steel-alloy provided by the invention is used as the purposes of ventilating vane.
The ventilating vane made of low-carbon micro steel-alloy provided by the invention is for the purposes of ventilator.
Ventilating vane provided by the invention is made up of low-carbon micro steel-alloy provided by the invention.
Ventilator provided by the invention comprises ventilating vane provided by the invention.
Low-carbon micro steel-alloy provided by the invention adopts low cost Composition Design route, and adopt C-Si-Mn-Ti component system, add higher Ti in steel, fixed interval (FI) atom N, utilizes TiC precipitation strength simultaneously; Without the need to adding the microalloy elements such as expensive Mo, Nb, V, higher Ti is added on the basis of C-Si-Mn steel, make full use of Ti grain refining, precipitation strength and Ti and can reduce the advantages such as the first kind 250 ~ 400 DEG C of temper brittleness, produce yield strength at more than 600MPa, there is good plasticity, toughness and welding property, and there is not blue shortness at 300 ~ 400 DEG C, there is higher fatigue lifetime, ventilating vane service requirements can be met.
Accompanying drawing explanation
By reading hereafter detailed description of the preferred embodiment, various other advantage and benefit will become cheer and bright for those of ordinary skill in the art.Accompanying drawing only for illustrating the object of preferred implementation, and does not think limitation of the present invention.And in whole accompanying drawing, represent identical parts by identical reference symbol.In the accompanying drawings:
Fig. 1 is the structure figure of low-carbon micro steel-alloy provided by the invention.
Embodiment
The present invention for solving prior art Problems existing, provide a kind of there is the low-carbon micro steel-alloy of superior low-temperature toughness and resistance toheat, the preparation method of this low-carbon micro steel-alloy and purposes, apply the ventilating vane that this low-carbon micro steel-alloy obtains, the ventilator comprising this ventilating vane.
For further setting forth the present invention for the technique means reaching predetermined goal of the invention and take and effect, below in conjunction with accompanying drawing and preferred embodiment, to the low-carbon micro steel-alloy, Preparation Method And The Use, the ventilating vane that propose according to the present invention, its embodiment, structure, feature and effect thereof, be described in detail as follows.In the following description, the not necessarily same embodiment that different " embodiment " or " embodiment " refers to.In addition, special characteristic, structure or feature in one or more embodiment can be combined by any suitable form.
Term "and/or" herein, being only a kind of incidence relation describing affiliated partner, can there are three kinds of relations in expression, such as, A and/or B, concrete is interpreted as: can include A and B simultaneously, can Individual existence A, also can Individual existence B, above-mentioned three kinds of any one situations can be possessed.
It is wide that the embodiment of the present invention 1 ~ 13 adopts the wide hot tandem rolling broad strip mill of 2250mm to produce 1500 ~ 2015mm, the ventilating vane steel that 3 ~ 16mm is thick.
Embodiment 1
By molten steel after KR desulfurization process, complete three de-converter smeltings, LF stove refining treatment, then carry out continuous casting; Its slab smelting component per-cent is: C:0.08%; Si:0.16%; Mn:1.18%; P:0.010%; S:0.003%; Alt:0.04%; Als:0.037%; Ti:0.07%; N:0.0034%, all the other are Fe and other inevitable impurity elements.
By heating of plate blank to 1200 DEG C, be incubated 3.5 hours, entry temperature at finishing is 980 DEG C, and workpiece thickness is 55mm, and finishing temperature is 836 DEG C, and target thickness is 13.8mm, is then chilled to target coiling temperature 570 DEG C through section cooling, batches rear air cooling to room temperature.Finally obtain ventilating vane steel, its yield strength is 632MPa, and tensile strength is 710MPa, and unit elongation is 27%, and-20 DEG C of ballistic work 157J (impact specimen is of a size of 10mm × 10mm × 55mm), steel plate specification is 13.8 × 1800mm.
Embodiment 2
By molten steel after KR desulfurization process, complete three de-converter smeltings, LF stove refining treatment, then carry out continuous casting; Its slab smelting component per-cent is: C:0.06%; Si:0.15%; Mn:1.20%; P:0.011%; S:0.002%; Alt:0.04%; Als:0.037%; Ti:0.07%; N:0.0034%, all the other are Fe and other inevitable impurity elements.
By heating of plate blank to 1220 DEG C, be incubated 3.3 hours, entry temperature at finishing is 1000 DEG C, and workpiece thickness is 50mm, and finishing temperature is 860 DEG C, and target thickness is 9.7mm, is then chilled to target coiling temperature 590 DEG C through section cooling, batches rear air cooling to room temperature.Finally obtain ventilating vane steel, its yield strength is 611MPa, and tensile strength is 695MPa, and unit elongation is 30.0%, and-20 DEG C of ballistic work 128J (impact specimen is of a size of 7.5mm × 10mm × 55mm), steel plate specification is 9.7 × 1500mm.
Embodiment 3
By molten steel after KR desulfurization process, complete three de-converter smeltings, LF stove refining treatment, then carry out continuous casting; Its slab smelting component per-cent is: C:0.07%; Si:0.16%; Mn:1.19%; P:0.009%; S:0.001%; Alt:0.04%; Als:0.036%; Ti:0.08%; N:0.0032%, all the other are Fe and other inevitable impurity elements.
By heating of plate blank to 1240 DEG C, be incubated 3.0 hours, entry temperature at finishing is 1040 DEG C, and workpiece thickness is 45mm, and finishing temperature is 880 DEG C, and target thickness is 3.0mm, is then chilled to target coiling temperature 610 DEG C through section cooling, batches rear air cooling to room temperature.Finally obtain ventilating vane steel, its yield strength is 683MPa, and tensile strength is 732MPa, and unit elongation is 26.5% ,-20 DEG C of ballistic work 136J, and steel plate specification is 3.0 × 1500mm.
Embodiment 4
By molten steel after KR desulfurization process, complete three de-converter smeltings, LF stove refining treatment, then carry out continuous casting; Its slab smelting component per-cent is: C:0.07%; Si:0.13%; Mn:1.21%; P:0.013%; S:0.003%; Alt:0.038%; Als:0.037%; Ti:0.07%; N:0.0033%, all the other are Fe and other inevitable impurity elements.
By heating of plate blank to 1250 DEG C, be incubated 3.2 hours, entry temperature at finishing is 1040 DEG C, and workpiece thickness is 45mm, and finishing temperature is 860 DEG C, and target thickness is 4.0mm, is then chilled to target coiling temperature 600 DEG C through section cooling, batches rear air cooling to room temperature.Finally obtain ventilating vane steel, its yield strength is 656MPa, and tensile strength is 705MPa, and unit elongation is 24.0% ,-20 DEG C of ballistic work 145J, and steel plate specification is 4.0 × 1265mm.
Embodiment 5
By molten steel after KR desulfurization process, complete three de-converter smeltings, LF stove refining treatment, then carry out continuous casting; Its slab smelting component per-cent is: C:0.06%; Si:0.16%; Mn:1.10%; P:0.010%; S:0.001%; Alt:0.042%; Als:0.037%; Ti:0.08%; N:0.0034%, all the other are Fe and other inevitable impurity elements.
By heating of plate blank to 1248 DEG C, be incubated 3.0 hours, entry temperature at finishing is 1032 DEG C, and workpiece thickness is 45mm, and finishing temperature is 860 DEG C, and target thickness is 5.8mm, is then chilled to target coiling temperature 600 DEG C through section cooling, batches rear air cooling to room temperature.Finally obtain ventilating vane steel, its yield strength is 643MPa, and tensile strength is 701MPa, and unit elongation is 27.0% ,-20 DEG C of ballistic work 159J, and steel plate specification is 5.8 × 1517mm.
Embodiment 6
By molten steel after KR desulfurization process, complete three de-converter smeltings, LF stove refining treatment, then carry out continuous casting; Its slab smelting component per-cent is: C:0.07%; Si:0.15%; Mn:1.22%; P:0.012%; S:0.002%; Alt:0.042%; Als:0.037%; Ti:0.08%; N:0.0038%, all the other are Fe and other inevitable impurity elements.
By heating of plate blank to 1231 DEG C, be incubated 3.5 hours, entry temperature at finishing is 1004 DEG C, and workpiece thickness is 55mm, and finishing temperature is 820 DEG C, and target thickness is 16.0mm, is then chilled to target coiling temperature 560 DEG C through section cooling, batches rear air cooling to room temperature.Finally obtain ventilating vane steel, its yield strength is 603MPa, and tensile strength is 669MPa, and unit elongation is 33.5%, and-20 DEG C of ballistic work 186J (impact specimen is of a size of 10mm × 10mm × 55mm), steel plate specification is 16.0 × 2011mm.
Embodiment 7
By molten steel after KR desulfurization process, complete three de-converter smeltings, LF stove refining treatment, then carry out continuous casting; Its slab smelting component per-cent is: C:0.07%; Si:0.145%; Mn:1.15%; P:0.011%; S:0.002%; Alt:0.038%; Als:0.033%; Ti:0.07%; N:0.0040%, all the other are Fe and other inevitable impurity elements.
By heating of plate blank to 1216 DEG C, be incubated 3.3 hours, entry temperature at finishing is 990 DEG C, and workpiece thickness is 55mm, and finishing temperature is 820 DEG C, and target thickness is 15.8mm, is then chilled to target coiling temperature 560 DEG C through section cooling, batches rear air cooling to room temperature.Finally obtain ventilating vane steel, its yield strength is 610MPa, and tensile strength is 683MPa, and unit elongation is 35.0%, and-20 DEG C of ballistic work 179J (impact specimen is of a size of 10mm × 10mm × 55mm), steel plate specification is 15.8 × 2010mm.
Embodiment 8
By molten steel after KR desulfurization process, complete three de-converter smeltings, LF stove refining treatment, then carry out continuous casting; Its slab smelting component per-cent is: C:0.06%; Si:0.15%; Mn:1.14%; P:0.015%; S:0.003%; Alt:0.042%; Als:0.039%; Ti:0.06%; N:0.0037%, all the other are Fe and other inevitable impurity elements.
By heating of plate blank to 1200 DEG C, be incubated 3.0 hours, entry temperature at finishing is 970 DEG C, and workpiece thickness is 55mm, and finishing temperature is 820 DEG C, and target thickness is 12.45mm, is then chilled to target coiling temperature 560 DEG C through section cooling, batches rear air cooling to room temperature.Finally obtain ventilating vane steel, its yield strength is 624MPa, and tensile strength is 706MPa, and unit elongation is 34.5%, and-20 DEG C of ballistic work 151J (impact specimen is of a size of 10mm × 10mm × 55mm), steel plate specification is 12.45 × 1502mm.
Embodiment 9
By molten steel after KR desulfurization process, complete three de-converter smeltings, LF stove refining treatment, then carry out continuous casting; Its slab smelting component per-cent is: C:0.08%; Si:0.16%; Mn:1.18%; P:0.014%; S:0.004%; Alt:0.04%; Als:0.037%; Ti:0.09%; N:0.0033%, all the other are Fe and other inevitable impurity elements.
By heating of plate blank to 1259 DEG C, be incubated 3.8 hours, entry temperature at finishing is 1053 DEG C, and workpiece thickness is 50mm, and finishing temperature is 860 DEG C, and target thickness is 5.0mm, is then chilled to target coiling temperature 600 DEG C through section cooling, batches rear air cooling to room temperature.Finally obtain ventilating vane steel, its yield strength is 654MPa, and tensile strength is 724MPa, and unit elongation is 22.0% ,-20 DEG C of ballistic work 185J, and steel plate specification is 5.0 × 1513mm.
Embodiment 10
By molten steel after KR desulfurization process, complete three de-converter smeltings, LF stove refining treatment, then carry out continuous casting; Its slab smelting component per-cent is: C:0.07%; Si:0.14%; Mn:1.18%; P:0.013%; S:0.003%; Alt:0.043%; Als:0.037%; Ti:0.08%; N:0.0035%, all the other are Fe and other inevitable impurity elements.
By heating of plate blank to 1200 DEG C, be incubated 3.2 hours, entry temperature at finishing is 983 DEG C, and workpiece thickness is 55mm, and finishing temperature is 820 DEG C, and target thickness is 11.8mm, is then chilled to target coiling temperature 560 DEG C through section cooling, batches rear air cooling to room temperature.Finally obtain ventilating vane steel, its yield strength is 611MPa, and tensile strength is 674MPa, and unit elongation is 33.0%, and-20 DEG C of ballistic work 162J (impact specimen is of a size of 10mm × 10mm × 55mm), steel plate specification is 11.79 × 1509mm.
Embodiment 11
By molten steel after KR desulfurization process, complete three de-converter smeltings, LF stove refining treatment, then carry out continuous casting; Its slab smelting component per-cent is: C:0.07%; Si:0.13%; Mn:1.18%; P:0.010%; S:0.004%; Alt:0.043%; Als:0.037%; Ti:0.08%; N:0.0033%, all the other are Fe and other inevitable impurity elements.
By heating of plate blank to 1245 DEG C, be incubated 3.6 hours, entry temperature at finishing is 1026 DEG C, and workpiece thickness is 50mm, and finishing temperature is 860 DEG C, and target thickness is 7.8mm, is then chilled to target coiling temperature 600 DEG C through section cooling, batches rear air cooling to room temperature.Finally obtain ventilating vane steel, its yield strength is 651MPa, and tensile strength is 715MPa, and unit elongation is 29.0%, and-20 DEG C of ballistic work 105J (impact specimen is of a size of 7.5mm × 10mm × 55mm), steel plate specification is 7.8 × 1512mm.
Embodiment 12
By molten steel after KR desulfurization process, complete three de-converter smeltings, LF stove refining treatment, then carry out continuous casting; Its slab smelting component per-cent is: C:0.06%; Si:0.15%; Mn:1.20%; P:0.011%; S:0.002%; Alt:0.04%; Als:0.037%; Ti:0.07%; N:0.0034%, all the other are Fe and other inevitable impurity elements.
By heating of plate blank to 1246 DEG C, be incubated 3.3 hours, entry temperature at finishing is 1040 DEG C, and workpiece thickness is 45mm, and finishing temperature is 880 DEG C, and target thickness is 3.8mm, is then chilled to target coiling temperature 620 DEG C through section cooling, batches rear air cooling to room temperature.Finally obtain ventilating vane steel, its yield strength is 677MPa, and tensile strength is 739MPa, and unit elongation is 24.0% ,-20 DEG C of ballistic work 190J, and steel plate specification is 3.8 × 1510mm.
Embodiment 13
By molten steel after KR desulfurization process, complete three de-converter smeltings, LF stove refining treatment, then carry out continuous casting; Its slab smelting component per-cent is: C:0.07%; Si:0.17%; Mn:1.15%; P:0.012%; S:0.004%; Alt:0.038%; Als:0.036%; Ti:0.08%; N:0.0024%, all the other are Fe and other inevitable impurity elements.
By heating of plate blank to 1215 DEG C, be incubated 3.7 hours, entry temperature at finishing is 960 DEG C, and workpiece thickness is 55mm, and finishing temperature is 820 DEG C, and target thickness is 12.45mm, is then chilled to target coiling temperature 560 DEG C through section cooling, batches rear air cooling to room temperature.Finally obtain ventilating vane steel, its yield strength is 618MPa, and tensile strength is 687MPa, and unit elongation is 35.0%, and-20 DEG C of ballistic work 185J (impact specimen is of a size of 10mm × 10mm × 55mm), steel plate specification is 12.45 × 1504mm.
Application table 1, table 2, more clearly illustrate the invention process 1 ~ 13:
Chemical component weight per-cent in the low-carbon micro steel-alloy that table 1 embodiment 1 ~ 13 provides
| Embodiment | C/％ | Si/％ | Mn/％ | P/％ | S/％ | Alt/％ | Als/％ | Ti/％ | N/％ |
| 1 | 0.08 | 0.160 | 1.18 | 0.010 | 0.003 | 0.040 | 0.037 | 0.07 | 0.0034 |
| 2 | 0.06 | 0.150 | 1.20 | 0.011 | 0.002 | 0.040 | 0.037 | 0.07 | 0.0034 |
| 3 | 0.07 | 0.160 | 1.19 | 0.009 | 0.001 | 0.040 | 0.036 | 0.08 | 0.0032 |
| 4 | 0.07 | 0.130 | 1.21 | 0.013 | 0.003 | 0.038 | 0.037 | 0.07 | 0.0033 |
| 5 | 0.06 | 0.160 | 1.10 | 0.010 | 0.001 | 0.042 | 0.037 | 0.08 | 0.0034 |
| 6 | 0.07 | 0.150 | 1.22 | 0.012 | 0.002 | 0.042 | 0.037 | 0.08 | 0.0038 |
| 7 | 0.07 | 0.145 | 1.15 | 0.011 | 0.002 | 0.038 | 0.033 | 0.07 | 0.0040 |
| 8 | 0.06 | 0.150 | 1.14 | 0.015 | 0.003 | 0.042 | 0.039 | 0.06 | 0.0037 |
| 9 | 0.08 | 0.160 | 1.18 | 0.014 | 0.004 | 0.040 | 0.037 | 0.09 | 0.0033 |
| 10 | 0.07 | 0.140 | 1.18 | 0.013 | 0.003 | 0.043 | 0.037 | 0.08 | 0.0035 |
| 11 | 0.07 | 0.130 | 1.18 | 0.010 | 0.004 | 0.043 | 0.037 | 0.08 | 0.0033 |
| 12 | 0.06 | 0.150 | 1.20 | 0.011 | 0.002 | 0.040 | 0.037 | 0.07 | 0.0034 |
| 13 | 0.07 | 0.170 | 1.15 | 0.012 | 0.004 | 0.038 | 0.036 | 0.08 | 0.0024 |
Processing parameter in the preparation method that table 2 embodiment 1 ~ 13 provides and technique effect
In the low-carbon micro steel-alloy that the embodiment of the present invention 1 ~ 13 provides:
C: expand austenitic area element meanwhile, is also improve the most economical element of the strength of materials.But too high C content is unfavorable to the welding property of material, plasticity, toughness.Consider the toughness that the requirement of ventilating vane steel is good and welding property, controlling C content is 0.05 ~ 0.09%.
Si:Si is solution strengthening element, but adds too high Si and have a negative impact to the plasticity of material, toughness and surface quality, also can reduce Carbon diffusion speed in austenite simultaneously, be unfavorable for the formation of ferritic structure.The content of the present invention's control Si is: 0.10 ~ 0.20%.
Mn:Mn has solution strengthening effect, can improve the hardening capacity of material simultaneously.Shown by the research in early stage: Mn and Ti compound is added, higher Mn content inhibits the grain nucleation and growth of TiC particle under high temperature, and more TiC precipitate particle is separated out in ferrite area, further the precipitating reinforcing effect of raising TiC.The present invention's control Mn content is: 1.05 ~ 1.25%.
S and P:S and the too high meeting of P element have a negative impact to the plasticity of material and toughness.Present invention defines S content controls within 0.005%, and P content controls within 0.015%.
Ti:Ti is strong carbonitride-forming elements, higher Ti content, combines formation TiN or Ti (C, N) hinder growing up of austenite crystal at high temperature austenitic tagma Ti and N.Mn-Ti compound is added, and inhibit TiC in the precipitation of austenitic area, the Ti of still solid solution is combined the TiC nano particle forming a large amount of small and dispersed with C in ferrite area, serve significant precipitating reinforcing effect.But too high Ti content, can reduce the toughness of material, control Ti content is: 0.05 ~ 0.09%.
N:N is the harmful element in steel, produces in adverse influence, particularly high Ti steel to the plasticity of material and toughness, Ti and N bonding force is stronger, at high temperature form larger-size TiN, to the plasticity of material and toughness unfavorable, reduce simultaneously and be combined the effective Ti content forming TiC particle with C.The present invention controls N content within 0.0060%.
The controlling of production process main points that the present invention adopts are: smelting molten iron takes off converter smelting process to control S and the P harmful element of molten steel through KR desulfurization pre-treatment and complete three, adopt LF stove refining treatment to obtain the molten steel of required composition.
The Heating temperature that continuously cast bloom of the present invention adopts is 1200 ~ 1260 DEG C, soaking time 3.0 ~ 4.0 hours, and higher Heating temperature and longer soaking time object are to ensure that the carbonitride of Ti fully dissolves and austenite homogenizing.
The present invention adopts two-stage control rolling, and roughing adopts 5 passes, and accumulative deflection is greater than 75%; Workpiece thickness/finished product thickness >=3, ensure there are enough draught at austenite Unhydrated cement, are beneficial to the refinement of crystal grain; End percentage pass reduction >=8%, increases last reduction in pass, and being conducive to increases ferritic structure Dislocations density, and for TiC, in ferrite area, precipitation provides more nucleation site.
Steel band adopts front end cooling mode to carry out section cooling after going out finish rolling, be conducive to strengthening precipitating reinforcing effect, obtains the TiC precipitate particle of more small and disperseds, effectively improves the intensity of material.Coiling temperature of the present invention is 570 ~ 620 DEG C, and it is better that this temperature range TiC separates out effect, ensures to have enough phase change zone cooling rates simultaneously.
Low-carbon micro steel-alloy provided by the invention adopts low cost Composition Design route, and adopt C-Si-Mn-Ti component system, add higher Ti in steel, fixed interval (FI) atom N, utilizes TiC precipitation strength simultaneously; Without the need to adding the microalloy elements such as expensive Mo, Nb, V, higher Ti is added on the basis of C-Si-Mn steel, make full use of Ti grain refining, precipitation strength and Ti and can reduce the advantages such as the first kind 250 ~ 400 DEG C of temper brittleness, produce yield strength at more than 600MPa, there is good plasticity, toughness and welding property, and there is not blue shortness at 300 ~ 400 DEG C, there is higher fatigue lifetime, ventilating vane service requirements can be met.
See accompanying drawing 1, as can be seen from low-carbon micro steel-alloy metallurgical tissue picture provided by the invention, this low-carbon micro steel-alloy is organized as the perlite of quasi-polygonal ferrite+a small amount of.Higher Ti element is with the addition of in material, and take low temperature finish to gauge, finishing temperature control 820 ~ 860 DEG C, this temperature range TiC and Ti (C, N) precipitation can effectively hinder growing up of austenite crystal, and the ferritic average grain size obtained after overcooling is about 4.8 μm.Because after finish to gauge, section cooling pattern is that leading portion concentrates cooling, final cooling temperature controls, between 550 ~ 630 DEG C, to avoid pearlitic transformation district, therefore organizes Medium pearlite comparatively small amt, and in matrix, ferrite quantity is more, and its high-temperature stability is better.
Although describe the preferred embodiments of the present invention, those skilled in the art once obtain the basic creative concept of cicada, then can make other change and amendment to these embodiments.So claims are intended to be interpreted as comprising preferred embodiment and falling into all changes and the amendment of the scope of the invention.
Obviously, those skilled in the art can carry out various change and modification to the present invention and not depart from the spirit and scope of the present invention.Like this, if these amendments of the present invention and modification belong within the scope of the claims in the present invention and equivalent technologies thereof, then the present invention is also intended to comprise these change and modification.
Claims (9)
1. a low-carbon micro steel-alloy, is characterized in that, its chemical component weight per-cent is respectively: C:0.05 ~ 0.09%; Si:0.10 ~ 0.20%; Mn:1.05 ~ 1.25%; P :≤0.015%; S :≤0.005%; Al:0.020 ~ 0.050%; Ti:0.05 ~ 0.09%; N :≤0.0060%; All the other are Fe and inevitable impurity.
2. low-carbon micro steel-alloy according to claim 1, is characterized in that, in the steel plate of described low-carbon micro steel-alloy, the span of TiC precipitated phase mean sizes is 5 ~ 10nm.
3. the preparation method of the low-carbon micro steel-alloy described in claim 1 or 2, comprises the following steps successively: KR desulfurization → complete three take off converter smelting → LF refining → continuous casting → reheat → roughing → finish rolling → roller repairing → batch;
It is characterized in that,
The processing parameter of each step is respectively:
Strand is heated to 1200 ~ 1260 DEG C, slab soaking time 3.0 ~ 4.0h; Slab be in 1200 ~ 1260 DEG C time >=40 minutes;
Roughing and finish rolling adopt two-stage control rolling, and roughing adopts 5 passes, accumulative deflection > 75%; Workpiece thickness/finished product thickness >=3, entry temperature at finishing is 960 ~ 1060 DEG C, and finish rolling adopts 7 passes, last percentage pass reduction >=8%, and finishing temperature is 820 ~ 860 DEG C; Coiling temperature is 550 ~ 630 DEG C.
4. the preparation method of low-carbon micro steel-alloy according to claim 3, is characterized in that, described coiling temperature is 570 ~ 620 DEG C.
5. the preparation method of low-carbon micro steel-alloy according to claim 3, is characterized in that, described roller repairing adopts front end to concentrate cooling mode to carry out section cooling.
6. the low-carbon micro steel-alloy described in claim 1 or 2 is used as the purposes of ventilating vane.
7. ventilating vane according to claim 6 is used for the purposes of ventilator.
8. a ventilating vane, is characterized in that, is made up of the low-carbon micro steel-alloy described in claim 1 or 2.
9. a ventilator, is characterized in that, comprises ventilating vane according to claim 8.
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