CN103451371A - Covering argon blowing protective casting process and device of induction furnace molten steel - Google Patents
Covering argon blowing protective casting process and device of induction furnace molten steel Download PDFInfo
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- CN103451371A CN103451371A CN2013104085470A CN201310408547A CN103451371A CN 103451371 A CN103451371 A CN 103451371A CN 2013104085470 A CN2013104085470 A CN 2013104085470A CN 201310408547 A CN201310408547 A CN 201310408547A CN 103451371 A CN103451371 A CN 103451371A
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Abstract
The invention discloses a covering argon blowing protective casting process and device of induction furnace molten steel. After the deoxidization treatment of the induction furnace molten steel is completed and all deoxidization slag is removed, a slag charge is spread on the surface of the molten steel to completely cover the surface of the molten steel; after standing for 1-3 minutes, a slag charge hard cover covering the surface of the molten steel is formed; a hole is formed in the slag charge hard cover, the outlet of an argon blowing stainless steel tube is put through the hole into a gap between the surface of the molten steel and the slag charge hard cover, argon is blown in and the normal gas pressure is maintained; before casting of the molten steel, a steel outlet is cut out or stabbed out at the edge of the slag charge hard cover near a steel tapping spout; for the casting of molten steel, argon is continuously blown into the gap between the surface of the molten steel liquid and the slag charge hard cover and the normal gas pressure is maintained until casting is finished. For the casting of the induction furnace molten steel, an argon protective layer is formed on the surface of the molten steel; as a result, secondary oxidization of the molten steel in the hearth is obviously reduced, the cleanliness and inherent quality of castings are remarkably improved, and the consumption of argon in the whole process is low and the production cost is low.
Description
Technical field
The present invention relates to a kind of casting field, be specifically related to a kind of induction furnace molten steel and cover blowing argon pouring technology and device.
Background technology
Induction furnace is casting and field of metallurgy fusing and smelting equipment commonly used, mainly comprises inductor block, burner hearth, bell, comes out of the stove and topple over hydraulic efficiency system, water-cooled cable or copper bar, induction power supply, cooling water system.Burner hearth is arranged in inductor block, and it is suitable for reading that bell is placed on burner hearth, and induction power supply is by copper bar or water-cooled cable and inductor block connection, and water coolant and induction power supply, inductor block, water-cooled cable or copper bar are connected.When fusing and iron and steel smelting, at first start cooling water system, to induction power supply, water-cooled cable or copper bar, inductor block, force water flowing cooling, and then start induction power supply, and to the inductor block power transmission; While having solid steel iron furnace material in burner hearth, the exchange current in inductor block can produce inductive emf in furnace charge, and inductive emf is converted into eddy current again, thus heating and melting solid steel iron furnace material, and then temperature and the chemical composition of adjustment molten steel or iron liquid; When the temperature of molten steel or iron liquid and chemical composition meet the demands, just can remove bell, by the molten steel in burner hearth or iron liquid impouring casting ladle, or the molten steel in burner hearth or iron liquid are directly poured into to casting mold, as precision-investment casting formwork etc.In order to guarantee the slag charge in burner hearth not to be poured into to casting mold, induction furnace, when the molten steel by burner hearth or iron liquid pour into casting mold, must all remove the liquid or solid-state slag charge of roof of the furnace totally.But, such pouring operation can bring new secondary oxidation again, i.e. the oxidation of the molten steel in casting process or iron liquid, increased the non-metallic inclusion in the foundry goods, worsened the performance of foundry goods, especially all the more so for stainless steel, high temperature steel, the refractory alloy foundry goods of easy secondary oxidation.
Summary of the invention
The present invention is directed to the deficiencies in the prior art, propose a kind of secondary oxidation that can obviously reduce in induction furnace molten steel and iron liquid casting process, significantly improve the cleanliness factor of foundry goods and the induction furnace molten steel of inner quality and cover blowing argon pouring technology and device.
The present invention is achieved through the following technical solutions technical object.
A kind of induction furnace molten steel covers the blowing argon pouring technology, and its improvements are: have following processing step:
A. induction furnace adds the thermogenesis molten steel;
B. described molten steel is completed to deoxidation treatment, and remove whole deoxidation slags;
C. be sprinkled into the slag charge of 0.5 ~ 10kg toward described molten steel surface, cover described molten steel surface fully;
D. standing through 1 ~ 3 minute, the lower floor's slag charge contacted with described molten steel is in the semi-melting state, upper strata slag charge generation sintering simultaneously that do not contact with described molten steel, slag charge forms on described molten steel surface the slag charge duricrust that thickness is 2 ~ 30mm, covers described molten steel surface fully;
E. the described slag charge duricrust on described molten steel surface is chiseled or disclosed out than the large hole of Argon stainless steel tube external diameter, the outlet of described Argon stainless steel tube is stretched among the gap between described molten steel surface and described slag charge duricrust through described slag charge duricrust from this hole;
F. argon gas constantly is blown among the gap between described molten steel surface and described slag charge duricrust by described Argon stainless steel tube, the air pressure maintained in gap is positive air pressure;
G. near the described slag charge duricrust edge induction furnace tapping spout chisels or discloses and outputs the steel hole;
H. induction furnace is tilted to start cast, during cast, described molten steel flows to tapping spout from the tapping hole of described slag charge duricrust edge; Continuation is blown into argon gas by described Argon stainless steel tube among the gap between described molten steel surface and described slag charge duricrust, and the air pressure maintained in gap is positive air pressure, until the cast of described molten steel finishes;
J. after being poured, close argon bottle, remove described Argon stainless steel tube, remove described slag charge duricrust, start fusing and the smelting of next stove molten steel.
In above-mentioned technique, the composition of described slag charge duricrust (mass percent) is: SiO
260% ~ 75%, Al
2o
320% ~ 30%, MgO 2% ~ 5%, and CaO 1% ~ 4%, and ZrO 0.5% ~ 1%, C<0.001%, FeO<0.002%.
In above-mentioned technique, in the molten steel casting process, the ar pressure between described molten steel surface and slag charge duricrust in gap is that 0.001 ~ 0.01MPa, flow are 2 ~ 200 liter/mins.
In above-mentioned technique, the capacity of described induction furnace is 10 ~ 1000kg.
In above-mentioned technique, the time that described induction furnace molten steel covers the blowing argon cast is 1 ~ 120 minute.
A kind of device of implementing above-mentioned technique, be arranged on induction furnace top, and described induction furnace comprises furnace body support, inductor block, burner hearth, tapping spout, and molten steel is arranged in burner hearth; Its improvements are: described molten steel top be provided with cover the molten steel upper surface and with cover the molten steel upper surface slag charge duricrust of certain interval arranged; Near the slag charge duricrust edge induction furnace tapping spout is provided with the tapping hole; The device that described enforcement induction furnace molten steel covers the blowing argon pouring technology comprises Argon stainless steel tube, standing bolt, argon gas flexible pipe, gas meter, gas-pressure meter, argon bottle, and described Argon stainless steel tube, argon gas flexible pipe, gas meter, gas voltage regulating meter, argon bottle are communicated with successively; Described Argon stainless steel tube is fixedly connected on the top in the furnace body support outside by standing bolt; Described slag charge duricrust is provided with than the bigger hole of Argon stainless steel tube external diameter, and the outlet of described Argon stainless steel tube is stretched in this hole through the slag charge duricrust and stretched among the gap between molten steel surface and slag charge duricrust.
In said apparatus, the about 10mm of slag charge duricrust lower surface place is stretched in the outlet of Argon stainless steel tube.
The present invention compared with prior art, has following positively effect:
Form argon shield by the present invention on the molten steel surface when 1, the induction furnace molten steel is poured into a mould, the secondary oxygen that has obviously reduced molten steel in burner hearth has significantly improved cleanliness factor and the inner quality of foundry goods.
2, in the present invention, the apparatus structure of enforcement induction furnace molten steel covering blowing argon pouring technology is simple, is easy to realize.
3, the top of induction furnace molten steel is provided with the slag charge duricrust, formed the protective layer of molten steel, the outer air of induction furnace is difficult to enter this molten steel surface (between molten steel and slag charge duricrust, gap is positive air pressure in the process that flows into argon gas always), being blown into the argon gas in gap between molten steel and slag charge duricrust also is easy to retain, the gap of junction from Argon stainless steel tube and slag charge duricrust only, tapping is flowed out in hole on a small quantity, with the slag charge duricrust be not set compare, the argon gas consumption that the present invention covers the blowing argon pouring technology significantly reduces, significantly reduced the production cost of steel casting or steel ingot.
The accompanying drawing explanation
Fig. 1 is structural representation of the present invention.
Embodiment
Below the invention will be further described with reference to the accompanying drawings and in conjunction with the embodiments.
The induction furnace molten steel covers the blowing argon pouring technology, has following processing step:
A. induction furnace 14 adds thermogenesis molten steel 10;
B. molten steel 10 is completed to deoxidation treatment, and remove whole deoxidation slags;
C. be sprinkled into the slag charge of 0.5 ~ 10kg toward molten steel 10 surfaces, cover molten steel 10 surfaces fully;
D. standing through 1 ~ 3 minute, the lower floor's slag charge contacted with molten steel 10 is in the semi-melting state, upper strata slag charge generation sintering simultaneously that contact with molten steel 10, the slag charge duricrust 7 that slag charge is 2 ~ 30mm at molten steel 10 surface formation thickness, cover molten steel 10 surfaces fully;
E. the slag charge duricrust 7 on molten steel 10 surfaces is chiseled or disclosed out than the large hole of Argon stainless steel tube 1 external diameter, Argon stainless steel tube 1 outlet is stretched among the gap between molten steel 10 surfaces and slag charge duricrust 7 through slag charge duricrust 7 from this hole;
F. argon gas constantly is blown among the gap between molten steel 10 surface and slag charge duricrust 7 by Argon stainless steel tube 1, the air pressure maintained in gap is positive air pressure;
G. near slag charge duricrust 7 edges induction furnace 14 tapping spouts 9 chisel or disclose and output steel hole 7.1;
H. induction furnace 14 is tilted to start cast, during cast, molten steel 10 flows to tapping spout 9 from the tapping hole 7.1 of slag charge duricrust 7 edges; Continuation is blown into argon gas by Argon stainless steel tube 1 among the gap between molten steel 10 surfaces and slag charge duricrust 7, and the air pressure maintained in gap is positive air pressure, until molten steel 10 cast finish;
J. after being poured, close argon bottle 6, remove Argon stainless steel tube 1, remove slag charge duricrust 7, start fusing and the smelting of next stove molten steel.
Implement the device of above-mentioned technique shown in accompanying drawing, be arranged on induction furnace 14 tops, induction furnace 14 comprises furnace body support 13, inductor block 11, burner hearth 12, tapping spout 9, and molten steel 10 is arranged in burner hearth 12; Molten steel 10 tops be provided with cover molten steel 10 upper surfaces and with cover molten steel 10 upper surfaces the slag charge duricrust 7 of certain interval arranged; Near slag charge duricrust 7 edges induction furnace 14 tapping spouts 9 are provided with tapping hole 7.1; The device of implementing induction furnace molten steel covering blowing argon pouring technology comprises Argon stainless steel tube 1, standing bolt 2, argon gas flexible pipe 3, gas meter 4, gas-pressure meter 5, argon bottle 6, and Argon stainless steel tube 1, argon gas flexible pipe 3, gas meter 4, gas voltage regulating meter 5, argon bottle 6 are communicated with successively; Argon stainless steel tube 1 is fixedly connected on the top in furnace body support 13 outsides by standing bolt 2; Slag charge duricrust 7 is provided with than the large hole of Argon stainless steel tube 1 external diameter, the outlet of Argon stainless steel tube 1 is stretched in this hole through slag charge duricrust 7 and is stretched among the gap between molten steel 10 surfaces and slag charge duricrust 7, in the following example, the slag charge duricrust about 10mm of 7 lower surface place is stretched in the outlet of Argon stainless steel tube 1.
When furnace body support 13 verts, open argon bottle 6, argon gas will enter successively gas voltage regulating meter 5, gas meter 4, argon gas flexible pipe 3, Argon stainless steel tube 1 and finally enter in the gap, top of induction furnace molten steel 10 and slag charge duricrust 7, molten steel 10 in burner hearth 12 will flow into tapping spout 9 by tapping hole 7.1, finally is poured in casting mold or ingot mold.
Embodiment 1: utilize No. 45 carbon steel liquid of induction furnace 14 fusings that capacity is 100kg; when the temperature of No. 45 carbon steel liquid 10 reaches 1580 ℃; remove whole slags at burner hearth 12 tops, then be sprinkled into the protection slag charge of 0.5kg, the composition of slag charge (mass percent) is: SiO
275%, Al
2o
320%, MgO 2%, and CaO 1.998%, and ZrO 1%, C<0.001%, FeO<0.002%; Standing 1 minute, the thickness of slag charge duricrust 7 was 2mm; When induction furnace 14 starts to vert when No. 45 carbon steel liquid 10 are poured into to the precision-investment casting formwork, the pressure of adjusting gas-pressure meter 5 is 0.001MPa, the flow of adjusting gas measuring apparatus 4 is 2 liters of per minutes, argon gas is imported in the gap of the upper surface of No. 45 carbon steel liquid 10 in burner hearth 12 and slag charge duricrust 7, form one deck argon shield air films at No. 45 carbon steel liquid 10 upper surfaces, thereby obviously reduce the secondary oxidation in the casting process of No. 45 carbon steel liquid 10; Reaching the covering blowing argon of 5 minutes in the duration of pouring, the void content that in No. 45 carbon steel liquid, the secondary oxidation amplitude of content of residual aluminum has reduced the Melt casting of 70%, No. 45 carbon steel descends 90%.
Embodiment 2: utilize No. 45 carbon steel liquid of induction furnace 14 fusings that capacity is 100kg, when the temperature of No. 45 carbon steel liquid 10 reaches 1580 ℃, remove whole slags at burner hearth 12 tops, then be sprinkled into the protection slag charge of 5kg, the composition of slag charge (mass percent) is: SiO
275%, Al
2o
320%, MgO 2%, and CaO 1.998%, and ZrO 1%, C<0.001%, FeO<0.002%; Standing 3 minutes, the thickness of slag charge duricrust 7 was 30mm; When induction furnace 14 starts to vert when No. 45 carbon steel liquid 10 are poured into to the precision-investment casting formwork, the pressure of adjusting gas-pressure meter 5 is 0.01MPa, the flow of adjusting gas measuring apparatus 4 is 200 liters of per minutes, argon gas is imported in the gap of the upper surface of No. 45 carbon steel liquid 10 in burner hearth 12 and slag charge duricrust 7, form one deck argon shield air films at No. 45 carbon steel liquid 10 upper surfaces, thereby obviously reduce the secondary oxidation in the casting process of No. 45 carbon steel liquid 10; Reaching the covering blowing argon of 20 minutes in the duration of pouring, the void content that in No. 45 carbon steel liquid, the secondary oxidation amplitude of content of residual aluminum has reduced the Melt casting of 95%, No. 45 carbon steel descends 100%.
Embodiment 3: utilize No. 45 carbon steel liquid of induction furnace 14 fusings that capacity is 1000kg; when the temperature of No. 45 carbon steel liquid 10 reaches 1580 ℃; remove whole slags at burner hearth 12 tops, then be sprinkled into the protection slag charge of 10kg, the composition of slag charge (mass percent) is: SiO
275%, Al
2o
320%, MgO 2%, and CaO 1.998%, and ZrO 1%, C<0.001%, FeO<0.002%; Standing 2 minutes, the thickness of slag charge duricrust 7 was 15mm; When induction furnace 14 starts to vert when No. 45 carbon steel liquid 10 are poured into to the precision-investment casting formwork, the pressure of adjusting gas-pressure meter 5 is 0.005MPa, the flow of adjusting gas measuring apparatus 4 is 150 liters of per minutes, argon gas is imported in the gap of the upper surface of No. 45 carbon steel liquid 10 in burner hearth 12 and slag charge duricrust 7, form one deck argon shield air films at No. 45 carbon steel liquid 10 upper surfaces, thereby obviously reduce the secondary oxidation in the casting process of No. 45 carbon steel liquid 10; Reaching the covering blowing argon of 120 minutes in the duration of pouring, the void content that in No. 45 carbon steel liquid, the secondary oxidation amplitude of content of residual aluminum has reduced the Melt casting of 60%, No. 45 carbon steel descends 98%.
Embodiment 4: the grade of steel that utilizes the induction furnace 14 fusing AISI304(AISIA that capacity is 300kg) stainless steel molten steel; when the temperature of AISI304 stainless steel molten steel 10 reaches 1600 ℃; remove whole slags at burner hearth 12 tops; be sprinkled into the protection slag charge of 3kg, the composition of slag charge (mass percent) is: SiO again
260%, Al
2o
330%, MgO 5%, and CaO 4%, and ZrO 0.998%, C<0.001%, FeO<0.002%; Standing 2 minutes, the thickness of slag charge duricrust 7 was 20mm; When induction furnace 14 starts to vert when AISI304 stainless steel molten steel 10 is poured into to the precision-investment casting formwork, the pressure of adjusting gas-pressure meter 5 is 0.005MPa, the flow of adjusting gas measuring apparatus 4 is 50 liters of per minutes, argon gas is imported in the gap of the upper surface of the AISI304 stainless steel molten steel 10 in burner hearth 12 and slag charge duricrust 7, form one deck argon shield air films at AISI304 stainless steel molten steel 10 upper surfaces, thereby obviously reduce the secondary oxidation in the casting process of AISI304 stainless steel molten steel 10; Reaching the covering blowing argon of 20 minutes in the duration of pouring, the secondary oxidation amplitude of AISI304 stainless steel molten steel interalloy element has reduced by 90%, can obviously improve cleanliness factor and the inner quality of AISI304 stainless steel Melt casting.
Embodiment 5: the grade of steel that utilizes the induction furnace 14 fusing AISI304(AISIA that capacity is 250kg) stainless steel molten steel; when the temperature of AISI304 stainless steel molten steel 10 reaches 1600 ℃; remove whole slags at burner hearth 12 tops; be sprinkled into the protection slag charge of 1.5kg, the composition of slag charge (mass percent) is: SiO again
260%, Al
2o
330%, MgO 5%, and CaO 4%, and ZrO 0.998%, C<0.001%, FeO<0.002%; Standing 2 minutes, the thickness of slag charge duricrust 7 was 15mm; When induction furnace 14 starts to vert when AISI304 stainless steel molten steel 10 is poured into to the precision-investment casting formwork, the pressure of adjusting gas-pressure meter 5 is 0.005MPa, the flow of adjusting gas measuring apparatus 4 is 30 liters of per minutes, argon gas is imported in the gap of the upper surface of the AISI304 stainless steel molten steel 10 in burner hearth 12 and slag charge duricrust 7, form one deck argon shield air films at AISI304 stainless steel molten steel 10 upper surfaces, thereby obviously reduce the secondary oxidation in the casting process of AISI304 stainless steel molten steel 10; Reaching the covering blowing argon of 10 minutes in the duration of pouring, the secondary oxidation amplitude of AISI304 stainless steel molten steel interalloy element has reduced by 90%, can obviously improve cleanliness factor and the inner quality of AISI304 stainless steel Melt casting.
Embodiment 6: the grade of steel that utilizes the induction furnace 14 fusing AISI304(AISIA that capacity is 10kg) stainless steel molten steel; when the temperature of AISI304 stainless steel molten steel 10 reaches 1600 ℃; remove whole slags at burner hearth 12 tops; be sprinkled into the protection slag charge of 0.5kg, the composition of slag charge (mass percent) is: SiO again
260%, Al
2o
330%, MgO 5%, and CaO 4%, and ZrO 0.998%, C<0.001%, FeO<0.002%; Standing 1.5 minutes, the thickness of slag charge duricrust 7 was 20mm; When induction furnace 14 starts to vert when AISI304 stainless steel molten steel 10 is poured into to the precision-investment casting formwork, the pressure of adjusting gas-pressure meter 5 is 0.005MPa, the flow of adjusting gas measuring apparatus 4 is 5 liters of per minutes, argon gas is imported in the gap of the upper surface of the AISI304 stainless steel molten steel 10 in burner hearth 12 and slag charge duricrust 7, form one deck argon shield air films at AISI304 stainless steel molten steel 10 upper surfaces, thereby obviously reduce the secondary oxidation in the casting process of AISI304 stainless steel molten steel 10; Reaching the covering blowing argon of 1 minute in the duration of pouring, the secondary oxidation amplitude of AISI304 stainless steel molten steel interalloy element has reduced by 99%, can obviously improve cleanliness factor and the inner quality of AISI304 stainless steel Melt casting.
Embodiment 7: the grade of steel that utilizes the induction furnace 14 fusing AISI304(AISIA that capacity is 150kg) stainless steel molten steel; when the temperature of AISI304 stainless steel molten steel 10 reaches 1600 ℃; remove whole slags at burner hearth 12 tops; be sprinkled into the protection slag charge of 2kg, the composition of slag charge (mass percent) is: SiO again
270%, Al
2o
324.498%, MgO 4%, and CaO 1%, and ZrO 0.5%, C<0.001%, FeO<0.002%; Standing 2 minutes, the thickness of slag charge duricrust 7 was 15mm; When induction furnace 14 starts to vert when AISI304 stainless steel molten steel 10 is poured into to the precision-investment casting formwork, the pressure of adjusting gas-pressure meter 5 is 0.001MPa, the flow of adjusting gas measuring apparatus 4 is 20 liters of per minutes, argon gas is imported in the gap of the upper surface of the AISI304 stainless steel molten steel 10 in burner hearth 12 and slag charge duricrust 7, form one deck argon shield air films at AISI304 stainless steel molten steel 10 upper surfaces, thereby obviously reduce the secondary oxidation in the casting process of AISI304 stainless steel molten steel 10; Reaching the covering blowing argon of 7 minutes in the duration of pouring, the secondary oxidation amplitude of AISI304 stainless steel molten steel interalloy element has reduced by 90%, can obviously improve cleanliness factor and the inner quality of AISI304 stainless steel Melt casting.
Embodiment 8: utilizing the induction furnace fusing 0Cr17(German standard grade of steel that capacity is 150kg is 1.4016) the stainless steel molten steel; when the temperature of 0Cr17 stainless steel molten steel 10 reaches 1600 ℃; remove whole slags at burner hearth 12 tops; be sprinkled into the protection slag charge of 2kg, the composition of slag charge (mass percent) is: SiO again
270%, Al
2o
324.498%, MgO 4%, and CaO 1%, and ZrO 0.5%, C<0.001%, FeO<0.002%; Standing 2 minutes, the thickness of slag charge duricrust 7 was 15mm; When induction furnace 14 starts to vert when 0Cr17 stainless steel molten steel 10 is poured into to the precision-investment casting formwork, the pressure of adjusting gas-pressure meter 5 is 0.001MPa, the flow of adjusting gas measuring apparatus 4 is 25 liters of per minutes, argon gas is imported in the gap of the upper surface of the 0Cr17 stainless steel molten steel 10 in burner hearth 12 and slag charge duricrust 7, form one deck argon shield air films at 0Cr17 stainless steel molten steel 10 upper surfaces, thereby obviously reduce the secondary oxidation in the casting process of 0Cr17 stainless steel molten steel 10; Reaching the covering blowing argon of 7 minutes in the duration of pouring, the secondary oxidation amplitude of 0Cr17 stainless steel molten steel interalloy element has reduced by 90%, can obviously improve cleanliness factor and the inner quality of 0Cr17 stainless steel Melt casting.
Embodiment 9: utilizing the grade of steel of the induction furnace 14 fusing 06Cr25Ni20(AISIA that capacity is 150kg is AISI310S) the stainless steel molten steel; when the temperature of 06Cr25Ni20 stainless steel molten steel 10 reaches 1600 ℃; remove whole slags at burner hearth 12 tops; be sprinkled into the protection slag charge of 2kg, the composition of slag charge (mass percent) is: SiO again
270%, Al
2o
324.498%, MgO 4%, and CaO 1%, and ZrO 0.5%, C<0.001%, FeO<0.002%; Standing 2 minutes, the thickness of slag charge duricrust 7 was 15mm; When induction furnace 14 starts to vert when 06Cr25Ni20 stainless steel molten steel 10 is poured into to the precision-investment casting formwork, the pressure of adjusting gas-pressure meter 5 is 0.001MPa, the flow of adjusting gas measuring apparatus 4 is 25 liters of per minutes, argon gas is imported in the gap of the upper surface of the 06Cr25Ni20 stainless steel molten steel 10 in burner hearth 12 and slag charge duricrust 7, form one deck argon shield air films at 06Cr25Ni20 stainless steel molten steel 10 upper surfaces, thereby obviously reduce the secondary oxidation in the casting process of 06Cr25Ni20 stainless steel molten steel 10; Reaching the covering blowing argon of 7 minutes in the duration of pouring, the secondary oxidation amplitude of 06Cr25Ni20 stainless steel molten steel interalloy element has reduced by 90%, can obviously improve cleanliness factor and the inner quality of 06Cr25Ni20 stainless steel Melt casting.
Embodiment 10: utilizing the grade of steel of the induction furnace 14 fusing 06Cr25Ni20(AISIA that capacity is 150kg is AISI310S) the stainless steel molten steel; when the temperature of 06Cr25Ni20 stainless steel molten steel 10 reaches 1600 ℃; remove whole slags at burner hearth 12 tops; be sprinkled into the protection slag charge of 2kg, the composition of slag charge (mass percent) is: SiO again
270%, Al
2o
324.498%, MgO 4%, and CaO 1%, and ZrO 0.5%, C<0.001%, FeO<0.002%; Standing 2 minutes, the thickness of slag charge duricrust 7 was 15mm; When induction furnace 14 starts to vert when 06Cr25Ni20 stainless steel molten steel 10 is poured into to the precision-investment casting formwork, the pressure of adjusting gas-pressure meter 5 is 0.001MPa, the flow of adjusting gas measuring apparatus 4 is 25 liters of per minutes, argon gas is imported in the gap of the upper surface of the 06Cr25Ni20 stainless steel molten steel 10 in burner hearth 12 and slag charge duricrust 7, form one deck argon shield air films at 06Cr25Ni20 stainless steel molten steel 10 upper surfaces, thereby obviously reduce the secondary oxidation in the casting process of 06Cr25Ni20 stainless steel molten steel 10; Reaching the covering blowing argon of 3 minutes in the duration of pouring, the secondary oxidation amplitude of 06Cr25Ni20 stainless steel molten steel interalloy element has reduced by 90%, can obviously improve cleanliness factor and the inner quality of 06Cr25Ni20 stainless steel ingot.
Embodiment 11: utilizing the induction furnace 14 fusing 25Cr20Ni14Si2(European Union standard grades of steel that capacity is 150kg is 1.4832) the high temperature steel molten steel; when the temperature of 25Cr20Ni14Si2 high temperature steel molten steel 10 reaches 1600 ℃; remove whole slags at burner hearth 12 tops; be sprinkled into the protection slag charge of 2kg, the composition of slag charge (mass percent) is: SiO again
270%, Al
2o
324.498%, MgO 4%, and CaO 1%, and ZrO 0.5%, C<0.001%, FeO<0.002%; Standing 2 minutes, the thickness of slag charge duricrust 7 was 15mm; When induction furnace 14 starts to vert when 25Cr20Ni14Si2 high temperature steel molten steel 10 is poured into to the precision-investment casting formwork, the pressure of adjusting gas-pressure meter 5 is 0.001MPa, the flow of adjusting gas measuring apparatus 4 is 25 liters of per minutes, argon gas is imported in the gap of the upper surface of the 25Cr20Ni14Si2 high temperature steel molten steel 10 in burner hearth 12 and slag charge duricrust 7, form one deck argon shield air films at 25Cr20Ni14Si2 high temperature steel molten steel 10 upper surfaces, thereby obviously reduce the secondary oxidation in the casting process of 25Cr20Ni14Si2 high temperature steel molten steel 10; Reaching the covering blowing argon of 7 minutes in the duration of pouring, the secondary oxidation amplitude of 25Cr20Ni14Si2 high temperature steel molten steel interalloy element has reduced by 90%, can obviously improve cleanliness factor and the inner quality of 25Cr20Ni14Si2 high temperature steel Melt casting.
Embodiment 12: utilizing 14 fusings of induction furnace that capacity is 150kg is 1.4848+Nb containing the ZG40Cr25Ni20Si2(European Union standard grade of steel of Nb) the high temperature steel molten steel, when the temperature of the ZG40Cr25Ni20Si2 high temperature steel molten steel 10 containing Nb reaches 1600 ℃, remove whole slags at burner hearth 12 tops, be sprinkled into the protection slag charge of 2kg, the composition of slag charge (mass percent) is: SiO again
271%, Al
2o
324.498%, MgO 3%, and CaO 1%, and ZrO 0.5%, C<0.001%, FeO<0.002%, standing 2 minutes, the thickness of slag charge duricrust 7 was 15mm, when induction furnace 14 starts to vert will pour into the precision-investment casting formwork containing the ZG40Cr25Ni20Si2 high temperature steel molten steel 10 of Nb the time, the pressure of adjusting gas-pressure meter 5 is 0.001MPa, the flow of adjusting gas measuring apparatus 4 is 25 liters of per minutes, argon gas is imported in the gap of the upper surface of the ZG40Cr25Ni20Si2 high temperature steel molten steel 10 containing Nb in burner hearth 12 and slag charge duricrust 7, form one deck argon shield air film at ZG40Cr25Ni20Si2 high temperature steel molten steel 10 upper surfaces containing Nb, thereby obviously minimizing is containing the secondary oxidation in the casting process of the ZG40Cr25Ni20Si2 high temperature steel molten steel 10 of Nb, reaching the covering blowing argon of 7 minutes in the duration of pouring, the secondary oxidation amplitude that contains the ZG40Cr25Ni20Si2 high temperature steel molten steel interalloy element of Nb has reduced by 90%, can obviously improve cleanliness factor and inner quality containing the ZG40Cr25Ni20Si2 high temperature steel Melt casting of Nb.
Embodiment 13: utilizing the trade mark of induction furnace 14 ASTM of fusing W6Mo5Cr4V2(U.S. experiment material association that capacity is 150kg is M2) the rapid steel molten steel; when the temperature of W6Mo5Cr4V2 rapid steel molten steel 10 reaches 1600 ℃; remove whole slags at burner hearth 12 tops; be sprinkled into the protection slag charge of 2kg, the composition of slag charge (mass percent) is: SiO again
271%, Al
2o
324.498%, MgO 3%, and CaO 1%, and ZrO 0.5%, C<0.001%, FeO<0.002%; Standing 2 minutes, the thickness of slag charge duricrust 7 was 15mm; When induction furnace 14 starts to vert when W6Mo5Cr4V2 rapid steel molten steel 10 is poured into to the precision-investment casting formwork, the pressure of adjusting gas-pressure meter 5 is 0.001MPa, the flow of adjusting gas measuring apparatus 4 is 25 liters of per minutes, argon gas is imported in the gap of the upper surface of the W6Mo5Cr4V2 rapid steel molten steel 10 in burner hearth 12 and slag charge duricrust 7, form one deck argon shield air films at W6Mo5Cr4V2 rapid steel molten steel 10 upper surfaces, thereby obviously reduce the secondary oxidation in the casting process of W6Mo5Cr4V2 rapid steel molten steel 10; Reaching the covering blowing argon of 7 minutes in the duration of pouring, the secondary oxidation amplitude of W6Mo5Cr4V2 rapid steel molten steel interalloy element has reduced by 90%, can obviously improve cleanliness factor and the inner quality of W6Mo5Cr4V2 rapid steel Melt casting.
Claims (7)
1. an induction furnace molten steel covers the blowing argon pouring technology, it is characterized in that: have following processing step:
A. induction furnace (14) adds thermogenesis molten steel (10);
B. described molten steel (10) is completed to deoxidation treatment, and remove whole deoxidation slags;
C. be sprinkled into the slag charge of 0.5 ~ 10kg toward described molten steel (10) surface, cover described molten steel (10) surface fully;
D. standing through 1 ~ 3 minute, the lower floor's slag charge contacted with described molten steel (10) is in the semi-melting state, upper strata slag charge generation sintering simultaneously that do not contact with described molten steel (10), slag charge forms on described molten steel (10) surface the slag charge duricrust (7) that thickness is 2 ~ 30mm, covers described molten steel (10) surface fully;
E. the described slag charge duricrust (7) on described molten steel (10) surface is chiseled or disclosed out than the large hole of Argon stainless steel tube (1) external diameter, described Argon stainless steel tube (1) outlet is stretched among the gap between described molten steel (10) surface and described slag charge duricrust (7) through described slag charge duricrust (7) from this hole;
F. argon gas constantly is blown among the gap between described molten steel (10) surface and described slag charge duricrust (7) by described Argon stainless steel tube (1), the air pressure maintained in gap is positive air pressure;
G. near described slag charge duricrust (7) edge induction furnace (14) tapping spout (9) chisels or discloses and outputs steel hole (7.1);
H. induction furnace (14) is tilted to start cast, during cast, described molten steel (10) flows to tapping spout (9) from the tapping hole (7.1) of described slag charge duricrust (7) edge; Continue to be blown into argon gas by described Argon stainless steel tube (1) among the gap between described molten steel (10) surface and described slag charge duricrust (7), the air pressure maintained in gap is positive air pressure, until described molten steel (10) cast finishes;
J. after being poured, close argon bottle (6), remove described Argon stainless steel tube (1), remove described slag charge duricrust (7), start fusing and the smelting of next stove molten steel.
2. cover the blowing argon pouring technology according to the described induction furnace molten steel of claims 1, it is characterized in that: the composition (mass percent) of described slag charge duricrust (7) is: SiO
260% ~ 75%, Al
2o
320% ~ 30%, MgO 2% ~ 5%, and CaO 1% ~ 4%, and ZrO 0.5% ~ 1%, C<0.001%, FeO<0.002%.
3. cover the blowing argon pouring technology according to the described induction furnace molten steel of claims 1; it is characterized in that: in the molten steel casting process, the ar pressure between described molten steel (10) surface and slag charge duricrust (7) in gap is that 0.001 ~ 0.01MPa, flow are 2 ~ 200 liter/mins.
4. cover the blowing argon pouring technology according to the described induction furnace molten steel of claims 1, it is characterized in that: the capacity of described induction furnace (14) is 10 ~ 1000kg.
5. cover the blowing argon pouring technology according to the described induction furnace molten steel of claims 1, it is characterized in that: the time that described induction furnace molten steel covers the blowing argon cast is 1 ~ 120 minute.
6. a device that implements the claims one of 1～5 described technique, be arranged on induction furnace (14) top, described induction furnace (14) comprises furnace body support (13), inductor block (11), burner hearth (12), tapping spout (9), and molten steel (10) is arranged in burner hearth (12); It is characterized in that: described molten steel (10) top be provided with cover molten steel (10) upper surface and with cover molten steel (10) upper surface the slag charge duricrust (7) of certain interval arranged; Near slag charge duricrust (7) edge induction furnace (14) tapping spout (9) is provided with tapping hole (7.1); The device that described enforcement induction furnace molten steel covers the blowing argon pouring technology comprises Argon stainless steel tube (1), standing bolt (2), argon gas flexible pipe (3), gas meter (4), gas-pressure meter (5), argon bottle (6), and described Argon stainless steel tube (1), argon gas flexible pipe (3), gas meter (4), gas voltage regulating meter (5), argon bottle (6) are communicated with successively; Described Argon stainless steel tube (1) is fixedly connected on the top in furnace body support (13) outside by standing bolt (2); Described slag charge duricrust (7) is provided with than the large hole of Argon stainless steel tube (1) external diameter, and the outlet of described Argon stainless steel tube (1) is stretched in this hole through slag charge duricrust (7) and stretched among the gap between molten steel (10) surface and slag charge duricrust (7).
7. device according to claim 6, it is characterized in that: the about 10mm of slag charge duricrust (7) lower surface place is stretched in the outlet of Argon stainless steel tube (1).
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| CN109750136A (en) * | 2019-01-11 | 2019-05-14 | 包头钢铁（集团）有限责任公司 | A kind of method that ladle molten steel standing prevents secondary oxidation in the process |
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Address after: 225505 hardware Road West, Jiangyan Development Zone, Jiangsu, Taizhou Patentee after: TAIZHOU XINYU PRECISION MANUFACTURE CO., LTD. Patentee after: University of Science and Technology Beijing Address before: 225505 hardware Road West, Jiangyan Development Zone, Jiangsu, Taizhou Patentee before: Taizhou XinYu Precision Casting Co., Ltd. Patentee before: University of Science and Technology Beijing |