CN104233043A - Method for smelting high titanium content alloy structure steel - Google Patents
Method for smelting high titanium content alloy structure steel Download PDFInfo
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- CN104233043A CN104233043A CN201410514267.2A CN201410514267A CN104233043A CN 104233043 A CN104233043 A CN 104233043A CN 201410514267 A CN201410514267 A CN 201410514267A CN 104233043 A CN104233043 A CN 104233043A
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Abstract
The invention discloses a method for smelting high titanium content alloy structure steel. The method comprises the following steps: adding ferro-aluminum to deoxidize in the tapping process of a converter, transferring the molten steel which is deoxidized by using ferro-aluminum into a LF (Ladle Refining) furnace, performing slagging treatment on the molten steel which is transferred into the LF furnace, performing LF for 20-40 minutes after the slagging treatment is completed, adding ferrotitanium to condition the titanium into to the molten steel after the LF refining is completed, and performing soft blowing for 9-15 minutes after the condition of the titanium is completed to uniformly distribute the titanium in the molten steel, wherein the content of Al in the molten steel being deoxidized by using the ferro-aluminum is 0.020-0.070wt%, and the content of the titanium alloy in the molten steel after the ferrotitanium is added is 0.05-0.35wt%.
Description
Technical field
The present invention relates to field of smelting, be specifically related to a kind of smelting process of high titanium content structural alloy steel.
Background technology
Along with smelting iron and steel technology development, the requirement of derived product to the intensity of steel is more and more higher, and titanium is added the intensity of raising steel that can be larger in steel.In order to titanium will be entered in steel, in LF stove refining process, normally regulate the titanium content in molten steel, thus improve the intensity of steel.
But prior art enters at molten steel the titanium content just regulated when LF stove is smelted in molten steel, and the inclusion now in molten steel is the Al of larger particles
2o
3inclusion, after adding ferrotianium tune titanium, the TiN particle of generation is less, is not easy with Al
2o
3inclusion is that core generates, the TiN inclusion that easy generation is pure, and in the rolling and deformation process of steel, pure TiN inclusion can not be out of shape, and pure TiN inclusion has sharp corner angle, in the use procedure of steel, the edges and corners of inclusion easily form tiny crack, thus reduce the fatigue lifetime of titanium master alloy structure iron.
Summary of the invention
The embodiment of the present application is by providing a kind of smelting process of high titanium content structural alloy steel, for solving prior art when smelting high titanium content structural alloy steel, the pure TiN inclusion content existed in high titanium content structural alloy steel is high, makes the technical problem that the fatigue lifetime of titanium master alloy structure iron reduces.
The embodiment of the present application provides a kind of smelting process of high titanium content structural alloy steel, comprises the following steps:
Step a: add ferro-aluminum deoxidation in converter tapping process, and the molten steel after ferro-aluminum deoxidation is proceeded to refining in LF stove, wherein, the content of the Al in the molten steel after described ferro-aluminum deoxidation is 0.020wt% ~ 0.070wt%;
Step b: carry out slag making process to the molten steel proceeded in described LF stove, wherein, the quantity of slag thickness of the slag after slag making process terminates is 200mm ~ 300mm, and in described slag, the content of CaO is 50wt% ~ 65wt%, SiO
2content be 0% ~ 10wt%, Al
2o
3content is 25wt% ~ 35wt%;
Step c: carry out LF refining 20min ~ 40min after slag making process terminates;
Steps d: after LF refining terminates, adds ferrotianium and carries out tune titanium in molten steel, and wherein, adding titanium alloy content in the molten steel after ferrotianium content is 0.05wt%-0.35wt%;
Step e: after tune titanium terminates, carry out soft blow 9min ~ 15min, the titanium in molten steel is uniformly distributed.
Optionally, described slag making process terminate after the quantity of slag thickness of slag be 210mm ~ 290mm.
Optionally, in step c, after slag making process terminates, LF refining 28min ~ 37min is carried out.
Optionally, in steps d, after LF refining terminates, add ferrotianium and carry out tune titanium in molten steel, wherein, adding titanium alloy content in the molten steel after ferrotianium content is 0.014wt%-0.015wt%.
Optionally, in step e, after tune titanium terminates, carry out soft blow 10min, wherein, described soft blow flow is 40L/min.
Optionally, in stepb by adding lime and fluorite carries out slag making process to the molten steel proceeded in described LF stove.
Optionally, after LF refining terminates, adding before ferrotianium carries out tune titanium in molten steel, in molten steel, the content of Ca is 0.0006wt% ~ 0.0009wt%.
Optionally, in step a, the content of the AL in the molten steel after described ferro-aluminum deoxidation is 0.025wt% ~ 0.060wt%.
Beneficial effect of the present invention is as follows:
Technical scheme is in converter tapping process, add ferro-aluminum deoxidation, and the molten steel after ferro-aluminum deoxidation is proceeded to LF stove carry out refining, again slag making process is carried out to the molten steel proceeded in described LF stove, and after slag making process terminates, carry out LF refining 20min ~ 40min, then after LF refining terminates, in molten steel, add ferrotianium carry out tune titanium, and after tune titanium terminates, carry out soft blow 9min ~ 15min, titanium in molten steel is uniformly distributed, due to before adding ferrotianium, in described slag, the content of CaO is 50wt% ~ 65wt% and Al
2o
3content is 25wt% ~ 35wt%, make to exist in molten steel a large amount of particle diameter at the calcium-aluminate type impurity of 1 ~ 4 μm, and after adding ferrotianium, the TiN inclusion produced generates for core with the calcium-aluminate type impurity of particle diameter at 1 ~ 4 μm, and in the rolling and deformation process of steel, can by grating with the TiN inclusion of calcium-aluminate type impurity core, inclusion is by after grating, there is no sharp corner angle, compared with pure TiN inclusion, there is the Influence of Fatigue Properties of TiN inclusion to steel of core less, thus the pure TiN inclusion content solved in prior art in high titanium content structural alloy steel is high, make the technical problem that the fatigue lifetime of titanium master alloy structure iron reduces, achieve the pure TiN inclusion content reduced in high titanium content structural alloy steel, improve the technique effect of the fatigue lifetime of titanium master alloy structure iron.
Embodiment
For prior art when smelting high titanium content structural alloy steel, the pure TiN inclusion content existed in high titanium content structural alloy steel is large, make the technical problem that the fatigue lifetime of titanium master alloy structure iron reduces, in the technical scheme that the embodiment of the present invention proposes, ferro-aluminum deoxidation is added in converter tapping process, and the molten steel after ferro-aluminum deoxidation is proceeded to refining in LF stove, again slag making process is carried out to the molten steel proceeded in described LF stove, and after slag making process terminates, carry out LF refining 20min ~ 40min, then after LF refining terminates, in molten steel, add ferrotianium carry out tune titanium, and after tune titanium terminates, carry out soft blow 9min ~ 15min, titanium in molten steel is uniformly distributed, due to before adding ferrotianium, in described slag, the content of CaO is 50wt% ~ 65wt% and Al
2o
3content is 25wt% ~ 35wt%, make to exist in molten steel a large amount of particle diameter at the calcium-aluminate type impurity of 1 ~ 4 μm, and after adding ferrotianium, the TiN inclusion produced generates for core with the calcium-aluminate type impurity of particle diameter at 1 ~ 4 μm, and in the rolling and deformation process of steel, can by grating with the TiN inclusion of calcium-aluminate type impurity core, inclusion is by after grating, there is no sharp corner angle, compared with pure TiN inclusion, there is the anti-fatigue performance impact of the TiN inclusion of core on steel less, thus the pure TiN inclusion content solved in prior art in high titanium content structural alloy steel is large, make the technical problem that the fatigue lifetime of titanium master alloy structure iron reduces, achieve the pure TiN inclusion content reduced in high titanium content structural alloy steel, improve the technique effect of the fatigue lifetime of titanium master alloy structure iron.
Below the main of embodiment of the present invention technical scheme is realized principle, embodiment and set forth in detail the beneficial effect that should be able to reach.
Embodiment one:
The embodiment of the present invention one proposes a kind of smelting process of high titanium content structural alloy steel, and the concrete treating processes of the method is as follows:
Lower mask body, can certainly 120 tons for 210 tons of oxygen combined blown converters, and 300 tons of oxygen combined blown converters are smelted, and the application does not do concrete restriction.
Step a: add ferro-aluminum deoxidation in converter tapping process, and the molten steel after ferro-aluminum deoxidation is proceeded to refining in LF stove, wherein, the content of the Al in the molten steel after described ferro-aluminum deoxidation is 0.020wt%.
In specific implementation process, add ferro-aluminum deoxidation at converter tapping process, and the content controlling the Al in the molten steel after being terminated by ferro-aluminum deoxidation is 0.020wt%, and then the molten steel after deoxidation is transported to refining in LF stove.
Step b: carry out slag making process to the molten steel proceeded in described LF stove, wherein, the quantity of slag thickness of the slag after slag making process terminates is 200mm, and in described slag, the content of CaO is 50wt%, SiO
2content be 10wt%, Al
2o
3content is 35wt%.
In specific implementation process, after molten steel proceeds to described LF stove, first slag making process is carried out to the molten steel in described LF stove, lime and fluorite can be adopted to carry out slag making process to the molten steel proceeded in described LF stove, is 210 tons of oxygen combined blown converters due to what adopt, therefore needs to add 1400kg lime in described LF stove and 200kg fluorite carries out slag making, the quantity of slag thickness of the slag after slag making process terminates is 200mm, and the content of CaO is 50wt%, SiO in described slag
2content be 10wt%, Al
2o
3content is 35wt%.
Specifically, owing to adopting high CaO content, the high Al of the larger quantity of slag
2o
3the slag of content, by the reaction between slag, the content of the Ca in molten steel is 0.0005wt%, and when carrying out chemical reaction between slag, described molten steel can generate a large amount of particle diameter at the CaS inclusion of 1 ~ 4 μm and the particle diameter calcium-aluminate type impurity at 1 ~ 4 μm.
Step c: carry out LF refining 20min after slag making process terminates.
In specific implementation process, after slag making process terminates, carry out LF refining 20min.
Steps d: after LF refining terminates, adds ferrotianium and carries out tune titanium in molten steel, and wherein, adding titanium alloy content in the molten steel after ferrotianium content is 0.05wt%.
In specific implementation process, after LF refining 20min, add ferrotianium and carry out tune titanium in molten steel, make titanium alloy content in the molten steel after adding ferrotianium be 0.05wt%, when carrying out tune titanium, concrete titanium content meets steel grades.
Step e: after tune titanium terminates, carry out soft blow 9min, the titanium in molten steel is uniformly distributed.
In specific implementation process, after tune titanium terminates, ladle bottom soft blow 9min can be carried out, titanium in molten steel is uniformly distributed, specifically can by soft blow flow control at 40L/min, and cast after soft blow, be rolled after casting, the coiled sheet of steel is obtained after rolling, wherein, there is the TiN inclusion of core in the operation of rolling of steel, become the less inclusion of particle, the corner angle of inclusion are no longer sharp, the fatigue lifetime of the coiled sheet of described steel is improved, according in fatigue test results, the fatigue lifetime of the high titanium content structural alloy steel that this experiment obtains is 1.32 × 10
6, and the fatigue lifetime of the high titanium content structural alloy steel adopting prior art to obtain is for being 5.72 × 10
5, thus compared with prior art, the fatigue lifetime of the high titanium content structure iron that technical scheme obtains improves a lot.
Concrete, because the embodiment of the present application adopts high CaO content, the high Al of the larger quantity of slag
2o
3the slag of content, by the reaction between slag, the content of the Ca in molten steel is 0.0005wt%, when carrying out chemical reaction between slag, a large amount of particle diameter can be generated at the CaS inclusion of 1 ~ 4 μm and the particle diameter calcium-aluminate type impurity at 1 ~ 4 μm in described molten steel, after LF refining terminates, add ferrotianium adjust titanium, after adding ferrotianium, the TiN inclusion produced with particle diameter 1 ~ 4 μm CaS inclusion and/or generate for core with the calcium-aluminate type impurity of particle diameter at 1 ~ 4 μm, make in the rolling and deformation process of steel, pure TiN inclusion can not be out of shape, and pure TiN inclusion has sharp corner angle, in the use procedure of steel, the edges and corners of inclusion easily form tiny crack, the fatigue lifetime of steel is reduced, and can by grating with the TiN inclusion of CaS inclusion or calcium-aluminate type impurity core, inclusion is by after grating, there is no sharp corner angle, compare with pure TiN inclusion, there is the Influence of Fatigue Properties of TiN inclusion to steel of core less, be conducive to the fatigue lifetime of improving steel.
Embodiment two:
The embodiment of the present invention two proposes a kind of smelting process of high titanium content structural alloy steel, and the concrete treating processes of the method is as follows:
Lower mask body, can certainly 120 tons for 210 tons of oxygen combined blown converters, and 300 tons of oxygen combined blown converters are smelted, and the application does not do concrete restriction.
Step a: add ferro-aluminum deoxidation in converter tapping process, and the molten steel after ferro-aluminum deoxidation is proceeded to refining in LF stove, wherein, the content of the Al in the molten steel after described ferro-aluminum deoxidation is 0.070wt%.
In specific implementation process, add ferro-aluminum deoxidation at converter tapping process, and the content controlling the Al in the molten steel after being terminated by ferro-aluminum deoxidation is 0.070wt%, and then the molten steel after deoxidation is transported to refining in LF stove.
Step b: carry out slag making process to the molten steel proceeded in described LF stove, wherein, the quantity of slag thickness of the slag after slag making process terminates is 300mm, and in described slag, the content of CaO is 65wt%, Al
2o
3content is 25wt%.
In specific implementation process, after molten steel proceeds to described LF stove, first slag making process is carried out to the molten steel in described LF stove, lime and fluorite can be adopted to carry out slag making process to the molten steel proceeded in described LF stove, is 210 tons of oxygen combined blown converters due to what adopt, therefore needs to add 1400kg lime in described LF stove and 200kg fluorite carries out slag making, the quantity of slag thickness of the slag after slag making process terminates is 300mm, and the content of CaO is 65wt%, Al in described slag
2o
3content is 25wt%.
Specifically, owing to adopting high CaO content, the high Al of the larger quantity of slag
2o
3the slag of content, by the reaction between slag, the content of the Ca in molten steel is 0.0008wt%, and when carrying out chemical reaction between slag, described molten steel can generate a large amount of particle diameter at the CaS inclusion of 1 ~ 4 μm and the particle diameter calcium-aluminate type impurity at 1 ~ 4 μm.
Step c: carry out LF refining 40min after slag making process terminates.
In specific implementation process, after slag making process terminates, carry out LF refining 40min.
Steps d: after LF refining terminates, adds ferrotianium and carries out tune titanium in molten steel, and wherein, adding titanium alloy content in the molten steel after ferrotianium content is 0.35wt%.
In specific implementation process, after LF refining 40min, add ferrotianium and carry out tune titanium in molten steel, make titanium alloy content in the molten steel after adding ferrotianium content be 0.35wt%, when carrying out tune titanium, concrete titanium content meets steel grades.
Step e: after tune titanium terminates, carry out soft blow 15min, the titanium in molten steel is uniformly distributed.
In specific implementation process, after tune titanium terminates, ladle bottom soft blow 15min can be carried out, titanium in molten steel is uniformly distributed, specifically can by soft blow flow control at 40L/min, and cast after soft blow, be rolled after casting, the coiled sheet of steel is obtained after rolling, wherein, there is the TiN inclusion of core in the operation of rolling of steel, become the less inclusion of particle, the corner angle of inclusion are no longer sharp, the fatigue lifetime of the coiled sheet of described steel is improved, according in fatigue test results, the fatigue lifetime of the high titanium content structural alloy steel that this experiment obtains is 1.30 × 10
6, and the fatigue lifetime of the high titanium content structural alloy steel adopting prior art to obtain is for being 5.82 × 10
5, thus compared with prior art, the fatigue lifetime of the high titanium content structure iron that technical scheme obtains improves a lot.
Concrete, because the embodiment of the present application adopts high CaO content, the high Al of the larger quantity of slag
2o
3the slag of content, by the reaction between slag, the content of the Ca in molten steel is 0.0008wt%, when carrying out chemical reaction between slag, a large amount of particle diameter can be generated at the CaS inclusion of 1 ~ 4 μm and the particle diameter calcium-aluminate type impurity at 1 ~ 4 μm in described molten steel, after LF refining terminates, add ferrotianium adjust titanium, after adding ferrotianium, the TiN inclusion produced with particle diameter 1 ~ 4 μm CaS inclusion and/or generate for core with the calcium-aluminate type impurity of particle diameter at 1 ~ 4 μm, make in the rolling and deformation process of steel, pure TiN inclusion can not be out of shape, and pure TiN inclusion has sharp corner angle, in the use procedure of steel, the edges and corners of inclusion easily form tiny crack, the fatigue lifetime of steel is reduced, and can by grating with the TiN inclusion of CaS inclusion or calcium-aluminate type impurity core, inclusion is by after grating, there is no sharp corner angle, compare with pure TiN inclusion, there is the Influence of Fatigue Properties of TiN inclusion to steel of core less, be conducive to the fatigue lifetime of improving steel.
Embodiment three:
The embodiment of the present invention three proposes a kind of smelting process of high titanium content structural alloy steel, and the concrete treating processes of the method is as follows:
Lower mask body, can certainly 120 tons for 210 tons of oxygen combined blown converters, and 300 tons of oxygen combined blown converters are smelted, and the application does not do concrete restriction.
Step a: add ferro-aluminum deoxidation in converter tapping process, and the molten steel after ferro-aluminum deoxidation is proceeded to refining in LF stove, wherein, the content of the Al in the molten steel after described ferro-aluminum deoxidation is 0.025wt%.
In specific implementation process, add ferro-aluminum deoxidation at converter tapping process, and the content controlling the Al in the molten steel after being terminated by ferro-aluminum deoxidation is 0.025wt%, and then the molten steel after deoxidation is transported to refining in LF stove.
Step b: carry out slag making process to the molten steel proceeded in described LF stove, wherein, the quantity of slag thickness of the slag after slag making process terminates is 270mm, and in described slag, the content of CaO is 64wt%, Al
2o
3content is 28wt% and and SiO
2content is 5wt%.
In specific implementation process, after molten steel proceeds to described LF stove, first slag making process is carried out to the molten steel in described LF stove, lime and fluorite can be adopted to carry out slag making process to the molten steel proceeded in described LF stove, is 210 tons of oxygen combined blown converters due to what adopt, therefore needs to add 1400kg lime in described LF stove and 200kg fluorite carries out slag making, the quantity of slag thickness of the slag after slag making process terminates is 270mm, and the content of CaO is 64wt%, Al in described slag
2o
3content is 28wt% and and SiO
2content is 5wt%.
Specifically, owing to adopting high CaO content, the high Al of the larger quantity of slag
2o
3the slag of content, by the reaction between slag, the content of the Ca in molten steel is 0.0006wt%, and when carrying out chemical reaction between slag, described molten steel can generate a large amount of particle diameter at the CaS inclusion of 1 ~ 4 μm and the particle diameter calcium-aluminate type impurity at 1 ~ 4 μm.
Concrete, after slag making process terminates, in molten steel, Al content and LF cinders content specifically see table 1:
| Al％ | CaO％ | Al 2O 3％ | SiO 2％ | MgO％ | T.Fe | MnO％ | Other |
| 0.025 | 63.9 | 26.9 | 3.9 | 4.3 | 0.4 | 0.3 | 0.3 |
Table 1
Step c: carry out LF refining 28min after slag making process terminates.
In specific implementation process, after slag making process terminates, carry out LF refining 28min.
Steps d: after LF refining terminates, adds ferrotianium and carries out tune titanium in molten steel, and wherein, adding titanium alloy content in the molten steel after ferrotianium content is 0.15wt%.
In specific implementation process, after LF refining 28min, add ferrotianium and carry out tune titanium in molten steel, make titanium alloy content in the molten steel after adding ferrotianium content be 0.15wt%, when carrying out tune titanium, concrete titanium content meets steel grades.
Step e: after tune titanium terminates, carry out soft blow 10min, the titanium in molten steel is uniformly distributed.
In specific implementation process, after tune titanium terminates, ladle bottom soft blow 10min can be carried out, titanium in molten steel is uniformly distributed, specifically can by soft blow flow control at 40L/min, and cast after soft blow, be rolled after casting, the coiled sheet of steel is obtained after rolling, wherein, there is the TiN inclusion of core in the operation of rolling of steel, become the less inclusion of particle, the corner angle of inclusion are no longer sharp, the fatigue lifetime of the coiled sheet of described steel is improved, according in fatigue test results, the fatigue lifetime of the high titanium content structural alloy steel that this experiment obtains is 1.34 × 10
6, and the fatigue lifetime of the high titanium content structural alloy steel adopting prior art to obtain is for being 5.80 × 10
5, thus compared with prior art, the fatigue lifetime of the high titanium content structure iron that technical scheme obtains improves a lot.
Concrete, because the embodiment of the present application adopts high CaO content, the high Al of the larger quantity of slag
2o
3the slag of content, by the reaction between slag, the content of the Ca in molten steel is 0.0006wt%, when carrying out chemical reaction between slag, a large amount of particle diameter can be generated at the CaS inclusion of 1 ~ 4 μm and the particle diameter calcium-aluminate type impurity at 1 ~ 4 μm in described molten steel, after LF refining terminates, add ferrotianium adjust titanium, after adding ferrotianium, the TiN inclusion produced with particle diameter 1 ~ 4 μm CaS inclusion and/or generate for core with the calcium-aluminate type impurity of particle diameter at 1 ~ 4 μm, make in the rolling and deformation process of steel, pure TiN inclusion can not be out of shape, and pure TiN inclusion has sharp corner angle, in the use procedure of steel, the edges and corners of inclusion easily form tiny crack, the fatigue lifetime of steel is reduced, and can by grating with the TiN inclusion of CaS inclusion or calcium-aluminate type impurity core, inclusion is by after grating, there is no sharp corner angle, compare with pure TiN inclusion, there is the Influence of Fatigue Properties of TiN inclusion to steel of core less, be conducive to the fatigue lifetime of improving steel.
Embodiment four:
The embodiment of the present invention four proposes a kind of smelting process of high titanium content structural alloy steel, and the concrete treating processes of the method is as follows:
Lower mask body, can certainly 120 tons for 210 tons of oxygen combined blown converters, and 300 tons of oxygen combined blown converters are smelted, and the application does not do concrete restriction.
Step a: add ferro-aluminum deoxidation in converter tapping process, and the molten steel after ferro-aluminum deoxidation is proceeded to refining in LF stove, wherein, the content of the Al in the molten steel after described ferro-aluminum deoxidation is 0.025wt%.
In specific implementation process, add ferro-aluminum deoxidation at converter tapping process, and the content controlling the Al in the molten steel after being terminated by ferro-aluminum deoxidation is 0.004wt%, and then the molten steel after deoxidation is transported to refining in LF stove.
Step b: carry out slag making process to the molten steel proceeded in described LF stove, wherein, the quantity of slag thickness of the slag after slag making process terminates is 210mm, and in described slag, the content of CaO is 55wt%, Al
2o
3content is 35wt% and SiO
2content is 5wt%.
In specific implementation process, after molten steel proceeds to described LF stove, first slag making process is carried out to the molten steel in described LF stove, lime and fluorite such as can be adopted to carry out slag making process to the molten steel proceeded in described LF stove, is 210 tons of oxygen combined blown converters due to what adopt, therefore needs to add 1400kg lime in described LF stove and 200kg fluorite carries out slag making, the quantity of slag thickness of the slag after slag making process terminates is 210mm, and the content of CaO is 55wt%, Al in described slag
2o
3content is 35wt% and SiO
2content is 5wt%.
Specifically, owing to adopting high CaO content, the high Al of the larger quantity of slag
2o
3the slag of content, by the reaction between slag, the content of the Ca in molten steel is 0.0009wt%, and when carrying out chemical reaction between slag, described molten steel can generate a large amount of particle diameter at the CaS inclusion of 1 ~ 4 μm and the particle diameter calcium-aluminate type impurity at 1 ~ 4 μm.
Concrete, after slag making process terminates, in molten steel, Al content and LF cinders content specifically see table 2:
| Al％ | CaO％ | Al 2O 3％ | SiO 2％ | MgO％ | T.Fe | MnO％ | Other |
| 0.04 | 52.2 | 34.8 | 4.4 | 6.3 | 0.7 | 0.9 | 0.7 |
Table 2
Step c: carry out LF refining 37min after slag making process terminates.
In specific implementation process, after slag making process terminates, carry out LF refining 37min.
Steps d: after LF refining terminates, adds ferrotianium and carries out tune titanium in molten steel, and wherein, adding titanium alloy content in the molten steel after ferrotianium content is 0.14wt%.
In specific implementation process, after LF refining 37min, add ferrotianium and carry out tune titanium in molten steel, make titanium alloy content in the molten steel after adding ferrotianium content be 0.14wt%, when carrying out tune titanium, concrete titanium content meets steel grades.
Step e: after tune titanium terminates, carry out soft blow 10min, the titanium in molten steel is uniformly distributed.
In specific implementation process, after tune titanium terminates, ladle bottom soft blow 10min can be carried out, titanium in molten steel is uniformly distributed, specifically can by soft blow flow control at 40L/min, and cast after soft blow, be rolled after casting, the coiled sheet of steel is obtained after rolling, wherein, there is the TiN inclusion of core in the operation of rolling of steel, become the less inclusion of particle, the corner angle of inclusion are no longer sharp, the fatigue lifetime of the coiled sheet of described steel is improved, according in fatigue test results, the fatigue lifetime of the high titanium content structural alloy steel that this experiment obtains is 1.34 × 10
6, and the fatigue lifetime of the high titanium content structural alloy steel adopting prior art to obtain is for being 5.80 × 10
5, thus compared with prior art, the fatigue lifetime of the high titanium content structure iron that technical scheme obtains improves a lot.
Concrete, because the embodiment of the present application adopts high CaO content, the high Al of the larger quantity of slag
2o
3the slag of content, by the reaction between slag, the content of the Ca in molten steel is 0.0009wt%, when carrying out chemical reaction between slag, a large amount of particle diameter can be generated at the CaS inclusion of 1 ~ 4 μm and the particle diameter calcium-aluminate type impurity at 1 ~ 4 μm in described molten steel, after LF refining terminates, add ferrotianium adjust titanium, after adding ferrotianium, the TiN inclusion produced with particle diameter 1 ~ 4 μm CaS inclusion and/or generate for core with the calcium-aluminate type impurity of particle diameter at 1 ~ 4 μm, make in the rolling and deformation process of steel, pure TiN inclusion can not be out of shape, and pure TiN inclusion has sharp corner angle, in the use procedure of steel, the edges and corners of inclusion easily form tiny crack, the fatigue lifetime of steel is reduced, and can by grating with the TiN inclusion of CaS inclusion or calcium-aluminate type impurity core, inclusion is by after grating, there is no sharp corner angle, compare with pure TiN inclusion, there is the Influence of Fatigue Properties of TiN inclusion to steel of core less, be conducive to the fatigue lifetime of improving steel.
Embodiment five:
The embodiment of the present invention five proposes a kind of smelting process of high titanium content structural alloy steel, and the concrete treating processes of the method is as follows:
Lower mask body, can certainly 120 tons for 210 tons of oxygen combined blown converters, and 300 tons of oxygen combined blown converters are smelted, and the application does not do concrete restriction.
Step a: add ferro-aluminum deoxidation in converter tapping process, and the molten steel after ferro-aluminum deoxidation is proceeded to refining in LF stove, wherein, the content of the Al in the molten steel after described ferro-aluminum deoxidation is 0.06wt%.
In specific implementation process, add ferro-aluminum deoxidation at converter tapping process, and the content controlling the Al in the molten steel after being terminated by ferro-aluminum deoxidation is 0.06wt%, and then the molten steel after deoxidation is transported to refining in LF stove.
Step b: carry out slag making process to the molten steel proceeded in described LF stove, wherein, the quantity of slag thickness of the slag after slag making process terminates is 290mm, and in described slag, the content of CaO is 57wt%, Al
2o
3content is 28wt% and SiO
2content is 8wt%.
In specific implementation process, after molten steel proceeds to described LF stove, first slag making process is carried out to the molten steel in described LF stove, lime and fluorite can be adopted to carry out slag making process to the molten steel proceeded in described LF stove, is 210 tons of oxygen combined blown converters due to what adopt, therefore needs to add 1400kg lime in described LF stove and 200kg fluorite carries out slag making, the quantity of slag thickness of the slag after slag making process terminates is 290mm, and the content of CaO is 57wt%, Al in described slag
2o
3content is 28wt% and SiO
2content is 8wt%.
Specifically, owing to adopting high CaO content, the high Al of the larger quantity of slag
2o
3the slag of content, by the reaction between slag, the content of the Ca in molten steel is 0.0008wt%, and when carrying out chemical reaction between slag, described molten steel can generate a large amount of particle diameter at the CaS inclusion of 1 ~ 4 μm and the particle diameter calcium-aluminate type impurity at 1 ~ 4 μm.
Concrete, after slag making process terminates, in molten steel, Al content and LF cinders content specifically see table 3:
| Al％ | CaO％ | Al 2O 3％ | SiO 2％ | MgO％ | T.Fe | MnO％ | Other |
| 0.06 | 55.3 | 26.7 | 7.3 | 9.6 | 0.3 | 0.5 | 0.3 |
Table 3
Step c: carry out LF refining 40min after slag making process terminates.
In specific implementation process, after slag making process terminates, carry out LF refining 40min.
Steps d: after LF refining terminates, adds ferrotianium and carries out tune titanium in molten steel, and wherein, adding titanium alloy content in the molten steel after ferrotianium content is 0.14wt%.
In specific implementation process, after LF refining 40min, add ferrotianium and carry out tune titanium in molten steel, make titanium alloy content in the molten steel after adding ferrotianium content be 0.14wt%, when carrying out tune titanium, concrete titanium content meets steel grades.
Step e: after tune titanium terminates, carry out soft blow 10min, the titanium in molten steel is uniformly distributed.
In specific implementation process, after tune titanium terminates, ladle bottom soft blow 10min can be carried out, titanium in molten steel is uniformly distributed, specifically can by soft blow flow control at 40L/min, and cast after soft blow, be rolled after casting, the coiled sheet of steel is obtained after rolling, wherein, there is the TiN inclusion of core in the operation of rolling of steel, become the less inclusion of particle, the corner angle of inclusion are no longer sharp, the fatigue lifetime of the coiled sheet of described steel is improved, according in fatigue test results, the fatigue lifetime of the high titanium content structural alloy steel that this experiment obtains is 1.34 × 10
6, and the fatigue lifetime of the high titanium content structural alloy steel adopting prior art to obtain is for being 5.80 × 10
5, thus compared with prior art, the fatigue lifetime of the high titanium content structure iron that technical scheme obtains improves a lot.
Concrete, because the embodiment of the present application adopts high CaO content, the high Al of the larger quantity of slag
2o
3the slag of content, by the reaction between slag, the content of the Ca in molten steel is 0.0008wt%, when carrying out chemical reaction between slag, a large amount of particle diameter can be generated at the CaS inclusion of 1 ~ 4 μm and the particle diameter calcium-aluminate type impurity at 1 ~ 4 μm in described molten steel, after LF refining terminates, add ferrotianium adjust titanium, after adding ferrotianium, the TiN inclusion produced with particle diameter 1 ~ 4 μm CaS inclusion and/or generate for core with the calcium-aluminate type impurity of particle diameter at 1 ~ 4 μm, make in the rolling and deformation process of steel, pure TiN inclusion can not be out of shape, and pure TiN inclusion has sharp corner angle, in the use procedure of steel, the edges and corners of inclusion easily form tiny crack, the fatigue lifetime of steel is reduced, and can by grating with the TiN inclusion of CaS inclusion or calcium-aluminate type impurity core, inclusion is by after grating, there is no sharp corner angle, compare with pure TiN inclusion, there is the Influence of Fatigue Properties of TiN inclusion to steel of core less, be conducive to the fatigue lifetime of improving steel.
To the above-mentioned explanation of the disclosed embodiments, professional and technical personnel in the field are realized or uses the present invention.To be apparent for those skilled in the art to the multiple amendment of these embodiments, General Principle as defined herein can without departing from the spirit or scope of the present invention, realize in other embodiments.Therefore, the present invention can not be restricted to these embodiments shown in this article, but will meet the widest scope consistent with principle disclosed herein and features of novelty.
Claims (8)
1. a smelting process for high titanium content structural alloy steel, is characterized in that, comprises the following steps:
Step a: add ferro-aluminum deoxidation in converter tapping process, and the molten steel after ferro-aluminum deoxidation is proceeded to refining in LF stove, wherein, the content of the Al in the molten steel after described ferro-aluminum deoxidation is 0.020wt% ~ 0.070wt%;
Step b: carry out slag making process to the molten steel proceeded in described LF stove, wherein, the quantity of slag thickness of the slag after slag making process terminates is 200mm ~ 300mm, and in described slag, the content of CaO is 50wt% ~ 65wt%, SiO
2content be 0% ~ 10wt%, Al
2o
3content is 25wt% ~ 35wt%;
Step c: carry out LF refining 20min ~ 40min after slag making process terminates;
Steps d: after LF refining terminates, adds ferrotianium and carries out tune titanium in molten steel, and wherein, adding titanium alloy content in the molten steel after ferrotianium content is 0.05wt%-0.35wt%;
Step e: after tune titanium terminates, carry out soft blow 9min ~ 15min, the titanium in molten steel is uniformly distributed.
2. smelting process as claimed in claim 1, it is characterized in that, the quantity of slag thickness of the slag after described slag making process terminates is 210mm ~ 290mm.
3. smelting process as claimed in claim 2, is characterized in that, in step c, carry out LF refining 28min ~ 37min after slag making process terminates.
4. smelting process as claimed in claim 3, it is characterized in that, in steps d, after LF refining terminates, add ferrotianium and carry out tune titanium in molten steel, wherein, adding titanium alloy content in the molten steel after ferrotianium content is 0.014wt%-0.015wt%.
5. smelting process as claimed in claim 4, is characterized in that, in step e, after tune titanium terminates, carry out soft blow 10min, wherein, described soft blow flow is 40L/min.
6. the smelting process as described in any one of Claims 1 to 5, is characterized in that, in stepb by adding lime and fluorite carries out slag making process to the molten steel proceeded in described LF stove.
7. smelting process as claimed in claim 6, is characterized in that, after LF refining terminates, adding before ferrotianium carries out tune titanium in molten steel, in molten steel, the content of Ca is 0.0006wt% ~ 0.0009wt%.
8. smelting process as claimed in claim 6, it is characterized in that, in step a, the content of the Al in the molten steel after described ferro-aluminum deoxidation is 0.025wt% ~ 0.060 wt%.
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| CN201410514267.2A CN104233043B (en) | 2014-09-29 | A kind of smelting process of high titanium content structural alloy steel |
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