CN201762373U - Argon and powder injection device and steel ladle refining furnace - Google Patents
Argon and powder injection device and steel ladle refining furnace Download PDFInfo
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- CN201762373U CN201762373U CN2010205230666U CN201020523066U CN201762373U CN 201762373 U CN201762373 U CN 201762373U CN 2010205230666 U CN2010205230666 U CN 2010205230666U CN 201020523066 U CN201020523066 U CN 201020523066U CN 201762373 U CN201762373 U CN 201762373U
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- argon
- control valve
- gas
- electrode tube
- dusting device
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Abstract
The utility model discloses an argon and powder injection device, which comprises a gas source (17).A gas source pathway control valve (16) is connected with the gas outlet of the gas source (17).The device is also equipped with a sealing pressure feed downpipe (12) for blanking. A feed downpipe control valve (11) is arranged at the discharging opening of the feed downpipe. The feed inlet of the gas mixing tank (10) is connected with the gas source pathway control valve (16) and the feed downpipe control valve (11) respectively. The discharging opening of the gas mixing tank (10) is equipped with a pathway control valve (9) thereof. The discharging opening of the path control valve (9) is connected with one end of a conveying pipe (8).The other end of the conveying pipe (8) is connected with one end of an electrode clamp (1). The electrode clamp (1) is connected with an electrode tube (2).The electrode clamp (1) provides the current for the electrode tube (2).A central aperture is formed inside the electrode clamp to feed argon to the electrode tube (2).The end of the electrode tube (2) is placed below the liquid level of molten steel (7).
Description
Technical field
The utility model relates to field of metallurgy, more particularly, relates to Argon dusting device and ladle refining furnace.
Background technology
LF stove (Ladle Furnace), promptly ladle refining furnace is an external refining equipment main in the Iron and Steel Production.The LF stove and accessory have in dark desulfurization, deep deoxidation, the removal steel nonmetal inclusion with cleaning molten steel, change inclusion morphology, prevent the molten steel secondary oxidation, intensification is also adjusted rich functions such as molten steel temperature, adjustment molten steel component, has obtained promotion and application widely in modern steel enterprise.
At present, the LF stove adds the thermal recovery arc technology, when electric-arc heating LF stove adds slag charge and alloying operation, when adopting the high hopper blanking usually and follow big argon gas amount to stir, thereby realize that the molten steel component homogenizing is to carry out operations such as deoxidation, desulfurization smoothly.In this process, be accompanied by airborne dust during the high hopper blanking operating environment is worsened, and the part material drops on the slag blanket, lost the effect that should bring into play, influenced the accuracy of operation and economical; Because the molten steel face is exposed in the big argon gas amount whipping process, absorption of nitrogen by steel and increased the molten steel oxidation.
The utility model content
In view of this, the utility model provides a kind of Argon dusting device, to realize reducing the oxidation of molten steel and the purpose that reduces airborne dust.
For achieving the above object, the utility model provides following technical scheme:
A kind of Argon dusting device comprises: source of the gas;
The source of the gas path control valve that links to each other with described source of the gas air outlet;
The seal-off pressure feed opening that is used for blanking, its discharge port place is equipped with the feed opening control valve;
The mixed gas tank that opening for feed links to each other with described feed opening control valve with described source of the gas path control valve respectively, described mixed gas tank discharge port are provided with and mix gas tank path control valve;
The transfer lime that one end links to each other with the discharge port of described mixed gas tank path control valve;
The terminal clamp that one end links to each other with the other end of described transfer lime, described terminal clamp links to each other with described electrode tube;
Described terminal clamp provides electric current for described electrode tube, and the inner central aperture that is formed for carrying to described electrode tube argon gas; The end of described electrode tube places under the liquid level of molten steel.
Preferably, in above-mentioned Argon dusting device, also be provided with the gas flow controller between described source of the gas path control valve and the described mixed gas tank, the inlet end of described gas flow controller links to each other with described source of the gas path control valve, first outlet side of described gas flow controller links to each other with the opening for feed of described mixed gas tank, and second outlet side of described gas flow controller links to each other with the discharge port of described mixed gas tank path control valve.
Preferably, in above-mentioned Argon dusting device, first outlet side and second outlet side of described gas flow controller are separately installed with pressure controller.
Preferably, in above-mentioned Argon dusting device, described electrode tube places the subsurface end of described molten steel to be provided with air-permeable layer.
Preferably, in above-mentioned Argon dusting device, described terminal clamp is provided with the sway brace that supports described electrode tube.
Preferably, in above-mentioned Argon dusting device, described electrode tube number is 3, and the distribution that is centrosymmetric.
Preferably, in above-mentioned Argon dusting device, the corresponding terminal clamp of described each electrode tube.
Preferably, in above-mentioned Argon dusting device, the circular arc processing is carried out in the bending place of described transfer lime.
The utility model also provides a kind of ladle refining furnace, comprises the Argon dusting device of above feature.
From technique scheme as can be seen, among the utility model embodiment since blanking and argon gas in mixing gas tank, mix after directly by transfer lime importing molten steel, can effectively not reduce operation field airborne dust owing to do not need the limit to import the stirring of argon gas limit, thereby improve Working environment.
In addition, this Argon dusting device can improve the refining effect through steel melting furnace.At first, argon gas brings to blanking blanking is directly contacted with molten steel, is swift in response; Secondly, the argon gas that enters into molten steel by electrode tube can strengthen the downward convection action of molten steel, by argon gas stream high-temperature molten steel is with downwards, promotes that thermal exchange is rapidly heated and equalizing temperature rapider more helping of molten steel heating.Once more, downward argon gas is in the ladle bottom Argon, argon gas can converge in the molten steel at the middle and upper levels at ladle, the effect of gathering to the center in the argon gas uphill process after the Argon bottom can breaking, carefullyyer when argon gas floats loose and be more evenly distributed, thereby make molten steel face center not have exposed reduce absorption of nitrogen by steel and oxidation.Once more, can directly rise to slag bottom when blanking is risen in molten steel with argon gas, part material is distributed to the drawback that the slag upper strata can't play a role when having avoided conventional blanking, makes institute's blanking can both participate in reaction and more helps accurately controlling molten steel component.At last, argon gas because electrode tube has been in the condition of high temperature so argon gas is heated by electrode tube, can further promote molten steel heating and equalizing temperature after entering molten steel when electrode tube is inner, do not need to change the ladle structure, simple in structurely is beneficial to enforcement.Therefore, the Argon dusting device that embodiment provided in the utility model can improve refining effect.
Description of drawings
In order to be illustrated more clearly in the utility model embodiment or technical scheme of the prior art, to do to introduce simply to the accompanying drawing of required use in embodiment or the description of the Prior Art below, apparently, accompanying drawing in describing below only is embodiment more of the present utility model, for those of ordinary skills, under the prerequisite of not paying creative work, can also obtain other accompanying drawing according to these accompanying drawings.
The plan structure synoptic diagram of the Argon dusting device that provides among the utility model embodiment is provided Fig. 1;
Fig. 2 provides the structural representation of electrode tube for the utility model embodiment;
The main TV structure synoptic diagram of the Argon dusting device that Fig. 3 provides for the utility model embodiment;
The fundamental diagram of the Argon dusting device that Fig. 4 provides for the utility model embodiment.
Embodiment
Relevant explanation of nouns:
LF stove (Ladle Furnace), i.e. ladle refining furnace.
Below in conjunction with the accompanying drawing among the utility model embodiment, the technical scheme among the utility model embodiment is clearly and completely described, obviously, described embodiment only is the utility model part embodiment, rather than whole embodiment.Based on the embodiment in the utility model, those of ordinary skills are not making the every other embodiment that is obtained under the creative work prerequisite, all belong to the scope of the utility model protection.
The utility model provides a kind of Argon dusting device, to realize reducing the oxidation of molten steel and the purpose that reduces airborne dust.
Please refer to Fig. 1 to Fig. 2, figure is the plan structure synoptic diagram of the Argon dusting device that provides among the utility model embodiment; Fig. 2 provides the structural representation of electrode tube for the utility model embodiment; The main TV structure synoptic diagram of the Argon dusting device that Fig. 3 provides for the utility model embodiment; The fundamental diagram of the Argon dusting device that Fig. 4 provides for the utility model embodiment.
Wherein, 1 is terminal clamp; 2 is electrode tube; 3 is sway brace; 4 is ladle; 5 is slag; 6 is air-permeable layer; 7 is molten steel; 8 is transfer lime; 9 for mixing gas tank path control valve; 10 for mixing gas tank; 11 is the feed opening control valve; 12 is the seal-off pressure feed opening; 13 are the pressure detector of setting out on a journey; 14 are following road pressure detector; 15 are the gas flow controller; 16 is source of the gas path control valve; 17 is source of the gas.
Present embodiment provides a kind of Argon dusting device, comprising: source of the gas 17, source of the gas path control valve 16, seal-off pressure feed opening 12, feed opening control valve 11, mixed gas tank 10, mixed gas tank path control valve 9, transfer lime 8, terminal clamp 1 and electrode tube 2.
Wherein, the air outlet of source of the gas 17 links to each other with source of the gas path control valve 16; The discharge port of seal-off pressure feed opening 12 is equipped with feed opening control valve 11; Source of the gas path control valve 16 links to each other with the opening for feed of mixed gas tank 10 respectively with feed opening control valve 11, and its discharge port is equipped with and mixes gas tank control valve 9; One end of transfer lime 8 links to each other with mixed gas tank control valve 9, and the other end links to each other with terminal clamp 1; Terminal clamp 1 links to each other with electrode tube 2, and terminal clamp provides electric current for described electrode tube, and the inner central aperture that is formed for carrying to described electrode tube 2 argon gas; The end of described electrode tube 2 places under the liquid level of molten steel 7.
Source of the gas 17 produces argon gas, for whole device provides argon gas; Source of the gas path control valve 11, the argon gas supply opens with disconnected in the control source of the gas 17; Seal-off pressure feed opening 12 is the inlet of blanking; Feed opening control valve 11, the material of control seal-off pressure feed opening 12 is made a bet; Mixing gas tank 10 is material and argon gas blended place; Mix gas tank path control valve 9 controls making a bet through mixed material and argon gas; Terminal clamp 1 provides electric current for electrode tube 2, and the aperture that provides argon gas to inject; Electrode tube 2, heating molten steel 7, and to molten steel 7 importing argon gas.
Among the utility model embodiment, place the subsurface end of described molten steel to be provided with air-permeable layer 6, please refer to accompanying drawing 2 in order to make argon gas import molten steel 7 interior electrode tubes 2 uniformly.Molten steel 7 is housed in the ladle 4, on the surface of molten steel 7 slag 5 is arranged, it is oxidized that slag 5 can be alleviated molten steel, electrode tube 2 inserts molten steel 7 times, heat for the electric current that electrode tube provides by terminal clamp 1, and in molten steel 7, import argon gas, molten steel is carried out desulfating and deoxidation handle.
Blanking and argon gas directly import molten steel by transfer lime after mixing in mixing gas tank, owing in the process that imports argon gas, do not need stirring, thus can reduce operation field airborne dust effectively, thus Working environment improved.
In addition, this Argon dusting device can improve the refining effect through steel melting furnace.At first, argon gas brings to blanking blanking is directly contacted with molten steel, is swift in response; Secondly, the argon gas that enters into molten steel by electrode tube can strengthen the downward convection action of molten steel, by argon gas stream high-temperature molten steel is with downwards, promotes that thermal exchange is rapidly heated and equalizing temperature rapider more helping of molten steel heating.Once more, downward argon gas be in can converge in the molten steel at the middle and upper levels behind the ladle bottom at ladle, can break the effect of gathering to the center in the argon gas uphill process after the Argon of bottom, and is thinner diffusing and be more evenly distributed when argon gas float, thereby it is exposed that molten steel face center is not had, and reduced absorption of nitrogen by steel and oxidation.Once more, can directly rise to slag bottom when blanking is risen in molten steel with argon gas, part material is distributed to the drawback that the slag upper strata can't play a role when having avoided conventional blanking, makes institute's blanking can both participate in reaction and more helps accurately controlling molten steel component.At last, argon gas because electrode tube has been in the condition of high temperature so argon gas is heated by electrode tube, can further promote molten steel heating and equalizing temperature after entering molten steel when electrode tube is inner, do not need to change the ladle structure, simple in structurely is beneficial to enforcement.Therefore, the Argon dusting device that embodiment provided in the utility model can improve refining effect.
For support electrode pipe better, at terminal clamp upper support arm.The number of electrode tube is any among the utility model embodiment, preferably 3, and the distribution that is centrosymmetric of three electrode tubes 2, three electrode tubes 2 can simultaneously corresponding terminal clamps 1, and promptly this terminal clamp 1 provides electric current and argon gas to 3 electrode tubes 2 simultaneously; Can also be the corresponding different respectively terminal clamps 1 of each electrode tube 2, terminal clamp 1 provides electric current and argon gas to corresponding electrode tube 2 with it.The corresponding different terminal clamp 1 of each electrode tube 2 preferably in the present embodiment, and be provided with the sway brace 3 that is used for support electrode pipe 2 on each terminal clamp.
In addition, import smoothly in the molten steel 7 in order to make blanking, the circular arc processing is carried out in the bending place of transfer lime 8, transfer lime 8 through the circular arc processing is little with the frictional force of blanking, and bending part have reasonable excessively, therefore, blanking can be alleviated to some extent to the surging force of transfer lime.
The Argon dusting device that provides among the embodiment in the utility model comprises: comprising: source of the gas 17, source of the gas path control valve 16, gas flow controller 15, seal-off pressure feed opening 12, feed opening control valve 11, mixed gas tank 10, mixed gas tank path control valve 9, transfer lime 8, terminal clamp 1 and electrode tube 2 are formed.
Wherein, the air outlet source of the gas path control valve 16 of source of the gas 17 links to each other, and the air outlet of source of the gas path control valve 16 links to each other with the inlet end of gas flow controller 15; The discharge port of seal-off pressure feed opening 12 is equipped with feed opening control valve 11; First outlet side of gas flow controller 15 links to each other with the opening for feed of mixed gas tank 10 respectively with feed opening control valve 11, its discharge port is equipped with and mixes gas tank control valve 9, and second outlet side of gas flow controller 15 links to each other with the discharge port of mixed gas tank path control valve 9; One end of transfer lime 8 links to each other with mixed gas tank control valve 9, and the other end links to each other with terminal clamp 1; Terminal clamp 1 links to each other with electrode tube 2, and terminal clamp provides electric current for described electrode tube, and the inner central aperture that is formed for carrying to described electrode tube 2 argon gas; The end of described electrode tube 2 places under the liquid level of molten steel 7.
Source of the gas 17 produces argon gas, for whole device provides argon gas; Source of the gas path control valve 11, the argon gas supply opens with disconnected in the control source of the gas 17; Seal-off pressure feed opening 12, the inlet of blanking; Feed opening control valve 11, the material of control seal-off pressure feed opening 12 is made a bet; Mix gas tank 10, material and argon gas blended place; Mix gas tank path control valve 9, whether control makes a bet through mixed material and argon gas; Terminal clamp 1, for electrode tube 2 provides electric current, and the aperture that provides argon gas to inject; Electrode tube 2, heating molten steel 7, and to molten steel 7 importing argon gas; Gas flow controller 15 can be realized the switching of argon gas pipeline.
The open and close of above-mentioned all control valve can also be regulated by computer or controller by the people for controlling.For the ease of observing the pressure size on the pipeline, be separately installed with set out on a journey pressure detector 13 and following road pressure detector 14 in two outlet sides of gas flow controller 15, two detectors are used for the size of signal piping pressure, for automatic control system, give computer or controller with detected pressure feedback, computer or controller are controlled in real time to all control valves again.
In embodiment of the present utility model, the supply air line of argon gas is divided into single channel, following single channel and two-way.
Last single channel air feed implementation procedure is: computer is opened by the pressure detector 13 detected force value control source of the gas path control valves 16 of setting out on a journey, open first outlet side of gas flow controller 15, the second outlet side closure, argon gas is behind overmulling gas tank 10 and blanking thorough mixing; Mix gas tank path control valve 9 and open, and import molten steel inside by terminal clamp 1 and electrode tube.
Following single channel air feed implementation procedure is: computer is opened by following road pressure detector 14 detected force value control source of the gas path control valves 16, open second outlet side of gas flow controller 15, the first outlet side closure, argon gas imports molten steel inside through transfer lime 8 and by terminal clamp 1 and electrode tube.
The parallel gas feed implementation procedure is: computer is opened by the pressure detector 13 detected force value control source of the gas path control valves 16 of setting out on a journey, open first outlet side of gas flow controller 15, open second outlet side, and the argon gas of setting out on a journey is behind overmulling gas tank 10 and blanking thorough mixing; Mix gas tank path control valve 9 and open, and import molten steel inside by terminal clamp 1 and electrode tube; The argon gas on following road imports molten steel inside through transfer lime 8 and by terminal clamp 1 and electrode tube.
The utility model also provides the ladle refining furnace with above-mentioned Argon dusting device structure, and this ladle refining furnace operation steps comprises:
Step S11: each control valve is in closing condition before starting working;
Step S12: tapping is finished ladle and is entered LF stove position;
Step S13: source of the gas place control valve is opened, and gas flow controller control argon gas enters down single channel;
Step S14: described system follows electrode to go into the position, and electrode is started working;
Step S15: when needs added slag charge or alloy, the slag charge or the powdered alloy that at first need to add entered into the seal-off pressure feed opening;
Step S16: gas flow controller control argon gas enters two-way, and the seal-off pressure feed opening begins blanking simultaneously;
Step S17: argon gas mixes stirring with blanking and reaches fluidised form in argon gas and the mixed gas tank of blanking fluidization;
Step S18: the gas flow controller cuts out Xia Lu, and argon gas and blanking fluidization meanwhile mixes gas tank bottom control valve and open;
Step S19: the seal-off pressure feed opening continues blanking, sets out on a journey continue to carry argon gas to take turns blanking until this to finish meanwhile the gas flow controller and close to set out on a journey and open road down;
Step S110: repeating step S15-step S19 when needs add other slag charges or alloy;
Step S111: finish when the effect of LF stove electrode, described system follows electrode to withdraw from ladle, withdraws from all control valves of back and closes.
Blanking in the utility model in the ladle refining furnace and argon gas directly import molten steel by transfer lime after mixing in mixing gas tank, can effectively not reduce operation field airborne dust owing to do not need the limit to import the stirring of argon gas limit, thereby improve Working environment.
In addition, this Argon dusting device can improve the refining effect through steel melting furnace.At first, argon gas brings to blanking blanking is directly contacted with molten steel, is swift in response; Secondly, the argon gas that enters into molten steel by electrode tube can strengthen the downward convection action of molten steel, by argon gas stream high-temperature molten steel is with downwards, promotes that thermal exchange is rapidly heated and equalizing temperature rapider more helping of molten steel heating.Once more, downward argon gas is in the ladle bottom Argon, argon gas can converge in the molten steel at the middle and upper levels at ladle, the effect of gathering to the center in the argon gas uphill process after the Argon bottom can breaking, carefullyyer when argon gas floats loose and be more evenly distributed, thereby make molten steel face center not have exposed reduce absorption of nitrogen by steel and oxidation.Once more, can directly rise to slag bottom when blanking is risen in molten steel with argon gas, part material is distributed to the drawback that the slag upper strata can't play a role when having avoided conventional blanking, makes institute's blanking can both participate in reaction and more helps accurately controlling molten steel component.At last, argon gas because electrode tube has been in the condition of high temperature so argon gas is heated by electrode tube, can further promote molten steel heating and equalizing temperature after entering molten steel when electrode tube is inner, do not need to change the ladle structure, simple in structurely is beneficial to enforcement.Therefore, the Argon dusting device that embodiment provided in the utility model can improve refining effect.
Each embodiment adopts the mode of going forward one by one to describe in this specification sheets, and what each embodiment stressed all is and the difference of other embodiment that identical similar part is mutually referring to getting final product between each embodiment.For the disclosed device of embodiment, because it is corresponding with the embodiment disclosed method, so description is fairly simple, relevant part partly illustrates referring to method and gets final product.
To the above-mentioned explanation of the disclosed embodiments, make this area professional and technical personnel can realize or use the utility model.Multiple modification to these embodiment will be conspicuous concerning those skilled in the art, and defined herein General Principle can realize under the situation that does not break away from spirit or scope of the present utility model in other embodiments.Therefore, the utility model will can not be restricted to these embodiment shown in this article, but will meet and principle disclosed herein and features of novelty the wideest corresponding to scope.
Claims (9)
1. an Argon dusting device is characterized in that, comprising: source of the gas (17);
The source of the gas path control valve (16) that links to each other with the air outlet of described source of the gas (17);
Be used for the seal-off pressure feed opening (12) of blanking, its discharge port place is equipped with feed opening control valve (11);
The mixed gas tank (10) that opening for feed links to each other with described feed opening control valve (11) with described source of the gas path control valve (16) respectively, the discharge port of described mixed gas tank (10) are provided with and mix gas tank path control valve (9);
The transfer lime (8) that one end links to each other with the discharge port of described mixed gas tank path control valve (9);
The terminal clamp (1) that one end links to each other with the other end of described transfer lime (8), described terminal clamp (1) links to each other with described electrode tube (2);
Described terminal clamp (1) provides electric current for described electrode tube (2), and inside is formed for carrying to described electrode tube (2) central aperture of argon gas; The end of described electrode tube (2) places under the liquid level of molten steel (7).
2. Argon dusting device according to claim 1, it is characterized in that, also be provided with gas flow controller (15) between described source of the gas path control valve (16) and the described mixed gas tank (10), the inlet end of described gas flow controller (15) links to each other with described source of the gas path control valve (16), first outlet side of described gas flow controller (15) links to each other with the opening for feed of described mixed gas tank (10), and second outlet side of described gas flow controller (15) links to each other with the discharge port of described mixed gas tank path control valve (9).
3. Argon dusting device according to claim 2 is characterized in that, first outlet side and second outlet side of described gas flow controller (16) are separately installed with pressure controller.
4. Argon dusting device according to claim 3 is characterized in that, described electrode tube (2) places the subsurface end of described molten steel (7) to be provided with air-permeable layer (6).
5. Argon dusting device according to claim 4 is characterized in that, described terminal clamp (1) is provided with the sway brace (3) that supports described electrode tube (2).
6. Argon dusting device according to claim 1 is characterized in that, the number of described electrode tube (2) is 3, and the distribution that is centrosymmetric.
7. Argon dusting device according to claim 6 is characterized in that, the corresponding terminal clamp of described each electrode tube (2).
8. Argon dusting device according to claim 6 is characterized in that, the circular arc processing is carried out in the bending place of described transfer lime (8).
9. a ladle refining furnace is characterized in that, comprises each described Argon dusting device of claim 1 to 8.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010205230666U CN201762373U (en) | 2010-09-08 | 2010-09-08 | Argon and powder injection device and steel ladle refining furnace |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010205230666U CN201762373U (en) | 2010-09-08 | 2010-09-08 | Argon and powder injection device and steel ladle refining furnace |
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| Publication Number | Publication Date |
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| CN201762373U true CN201762373U (en) | 2011-03-16 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN2010205230666U Expired - Lifetime CN201762373U (en) | 2010-09-08 | 2010-09-08 | Argon and powder injection device and steel ladle refining furnace |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101942541A (en) * | 2010-09-08 | 2011-01-12 | 莱芜钢铁股份有限公司 | Argon blowing and powder injection device and ladle refining furnace |
| CN103266198A (en) * | 2013-05-22 | 2013-08-28 | 中国重型机械研究院股份公司 | Powder spraying desulfuration mechanism for performing RH (Ruhrstahl and Heraeus) on molten steel |
-
2010
- 2010-09-08 CN CN2010205230666U patent/CN201762373U/en not_active Expired - Lifetime
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101942541A (en) * | 2010-09-08 | 2011-01-12 | 莱芜钢铁股份有限公司 | Argon blowing and powder injection device and ladle refining furnace |
| CN103266198A (en) * | 2013-05-22 | 2013-08-28 | 中国重型机械研究院股份公司 | Powder spraying desulfuration mechanism for performing RH (Ruhrstahl and Heraeus) on molten steel |
| CN103266198B (en) * | 2013-05-22 | 2014-08-06 | 中国重型机械研究院股份公司 | Powder spraying desulfuration mechanism for performing RH (Ruhrstahl and Heraeus) on molten steel |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| AV01 | Patent right actively abandoned |
Granted publication date: 20110316 Effective date of abandoning: 20120502 |