CN114686636A - Method for improving yield of 9Ni steel for low-temperature pressure container - Google Patents
Method for improving yield of 9Ni steel for low-temperature pressure container Download PDFInfo
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- CN114686636A CN114686636A CN202210350209.5A CN202210350209A CN114686636A CN 114686636 A CN114686636 A CN 114686636A CN 202210350209 A CN202210350209 A CN 202210350209A CN 114686636 A CN114686636 A CN 114686636A
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- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 94
- 239000010959 steel Substances 0.000 title claims abstract description 94
- 238000000034 method Methods 0.000 title claims abstract description 34
- 239000002893 slag Substances 0.000 claims abstract description 139
- 238000007664 blowing Methods 0.000 claims abstract description 43
- 239000000463 material Substances 0.000 claims abstract description 24
- 238000004519 manufacturing process Methods 0.000 claims abstract description 22
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 32
- 238000010079 rubber tapping Methods 0.000 claims description 24
- 229910052760 oxygen Inorganic materials 0.000 claims description 17
- 239000001301 oxygen Substances 0.000 claims description 17
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims description 16
- 229910052742 iron Inorganic materials 0.000 claims description 16
- 230000008569 process Effects 0.000 claims description 15
- 235000008733 Citrus aurantifolia Nutrition 0.000 claims description 9
- 235000011941 Tilia x europaea Nutrition 0.000 claims description 9
- 239000004571 lime Substances 0.000 claims description 9
- 239000002699 waste material Substances 0.000 claims description 6
- 238000003723 Smelting Methods 0.000 abstract description 17
- 229910052799 carbon Inorganic materials 0.000 abstract description 8
- 230000008901 benefit Effects 0.000 abstract description 6
- 230000000694 effects Effects 0.000 abstract description 5
- 229910052698 phosphorus Inorganic materials 0.000 abstract description 5
- 239000011574 phosphorus Substances 0.000 abstract description 5
- 230000000052 comparative effect Effects 0.000 description 10
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 6
- 239000003949 liquefied natural gas Substances 0.000 description 6
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 6
- 238000005261 decarburization Methods 0.000 description 5
- 230000008859 change Effects 0.000 description 4
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 description 3
- 239000003345 natural gas Substances 0.000 description 3
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 description 2
- 230000002159 abnormal effect Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 2
- 238000002844 melting Methods 0.000 description 2
- 230000008018 melting Effects 0.000 description 2
- 230000009467 reduction Effects 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- 238000007796 conventional method Methods 0.000 description 1
- 230000002950 deficient Effects 0.000 description 1
- 230000001934 delay Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000003607 modifier Substances 0.000 description 1
- 229910052759 nickel Inorganic materials 0.000 description 1
- 125000000864 peroxy group Chemical group O(O*)* 0.000 description 1
- 230000033764 rhythmic process Effects 0.000 description 1
- 238000003860 storage Methods 0.000 description 1
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
- C21C5/00—Manufacture of carbon-steel, e.g. plain mild steel, medium carbon steel or cast steel or stainless steel
- C21C5/28—Manufacture of steel in the converter
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
- C21C5/00—Manufacture of carbon-steel, e.g. plain mild steel, medium carbon steel or cast steel or stainless steel
- C21C5/28—Manufacture of steel in the converter
- C21C5/30—Regulating or controlling the blowing
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C33/00—Making ferrous alloys
- C22C33/04—Making ferrous alloys by melting
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Manufacturing & Machinery (AREA)
- Mechanical Engineering (AREA)
- Carbon Steel Or Casting Steel Manufacturing (AREA)
Abstract
The invention provides a method for improving the yield of 9Ni steel for a low-temperature pressure container, and belongs to the field of steel smelting. The invention breakthroughly uses the blowing mode of slag pouring and slag splashing, keeps the molten steel which is not discharged in the previous furnace in the furnace, and only keeps a small part of slag splashing, thereby not only leading the furnace to generate effect, but also reducing the loss of 9Ni molten steel to the maximum extent and greatly improving the yield of the molten steel. The invention can improve the yield of the 9Ni steel for the low-temperature pressure container, reduce the consumption of steel materials for producing the 9Ni steel to the maximum extent, reduce the blowing difficulty of the low-carbon and low-phosphorus 9Ni steel, greatly reduce the addition amount of slag splashing materials required by slag splashing, reduce the production cost, reduce the slag splashing time, shorten the smelting period of the 9Ni steel and improve the production efficiency and benefit.
Description
Technical Field
The invention belongs to the technical field of steel smelting, and particularly relates to a method for increasing the yield of 9Ni steel for a low-temperature pressure container and reducing the consumption of steel.
Background
With the increasing global environmental awareness, natural gas will occupy a more important position as a clean energy source in the future. Liquefied Natural Gas (LNG) is widely used by various countries in the world due to the characteristics of safety, reliability, convenience in transportation and the like, and the fact that the trade volume of the LNG in the world rises year by year in 2019-2000 is also proved. However, although the application of ultra-low temperature liquefaction technology can convert purified natural gas into liquid state, so that the volume of the purified natural gas is greatly reduced for convenient transportation, since the liquefied natural gas usually needs to reach the destination through a long offshore route, higher requirements are put on pressure vessel steel for storing the liquefied natural gas, and the pressure vessel steel not only needs to have high strength and excellent low-temperature toughness, but also needs to have excellent brittle fracture resistance, and then 9Ni steel is produced due to the fact that the excellent mechanical properties of the steel become key materials for preparing LNG storage tanks. However, in the smelting process, because the 9Ni steel has extremely strict requirements on components, in the smelting stage of the converter, carbon and phosphorus are both limited to be extremely low, the yield of the 9Ni steel smelted by the converter is usually low, on one hand, the consumption of steel materials is huge, and the production cost is seriously influenced, and on the other hand, because the requirement of extremely low carbon content of molten steel causes severe over-oxygen of slag, poor slag splashing furnace protection effect and difficult maintenance of furnace conditions.
At present, the converter smelting production mode of 9Ni steel is that after the previous slag splashing is finished, slag is poured into a slag basin, and carbon pulling at the last stage of converting is difficult due to overlarge slag amount, so that all slag is required to be poured into the slag basin in the slag pouring process, namely, slag is not remained for converting; the phosphorus content of the molten steel is required to be extremely low in the smelting stage of the converter, slag is strictly forbidden to enter a steel ladle in the tapping process of the converter, once molten steel is collected in the tapping process, a sliding plate is immediately closed to finish tapping, so that a part of residual molten steel in the converter cannot be poured out, and the residual in the converter is completely poured out immediately after slag splashing, so that the part of non-poured molten steel is seriously wasted, the yield of molten steel after the converter is seriously deficient, and the production cost is extremely high. Meanwhile, because of the requirement of extremely low carbon content, the slag produced by converter smelting is seriously peroxy and has extremely low viscosity, so that a large amount of slag splashing materials need to be added in the slag splashing furnace protection process to improve the viscosity of the slag, which is also a great consumption of materials, not only increases the cost, but also has poor slag splashing furnace protection effect.
The slag pouring and splashing is a steel smelting production mode, is different from the traditional converting mode, and is characterized in that partial slag in the furnace is poured out firstly after tapping is finished, then slag splashing furnace protection operation is carried out, and waste steel and molten iron are directly added after slag splashing for converting. The operation has the advantages that enough alkalinity of slag in the blowing furnace at the early stage of blowing when lime does not start to melt can be ensured, early dephosphorization is facilitated, and the qualified rate of smelting end point components is improved. The patent (CN113913583A) discloses a method for modifying slag and protecting a converter by splashing slag, which adds a large amount of modifier with complex components during splashing slag, and the case mentioned in the patent that the effect of splashing slag is good shows that the time for splashing slag is more than 250s, the operation is complex and seriously delays the production rhythm, and the method is particularly not suitable for practical application in the production of a fast-rhythm converter. The patent (CN114085943A) discloses a method for producing ordinary steel by remaining slag, which comprises the steps of firstly splashing slag after the steel is discharged from the previous furnace, then remaining part or all of the slag in the furnace, and then blowing the steel from the next furnace. In fact, the method is not consistent with the traditional slag remaining operation, the method has the advantages that the large slag remaining amount is beneficial to slag melting in the next steel blowing process, the dephosphorization difficulty is improved, however, the large slag remaining amount can cause low-temperature slag overflow in the early stage of blowing, and the large slag remaining operation is not suitable for the low molten iron ratio production mode in the current stage.
Disclosure of Invention
The invention aims to provide a method for smelting 9Ni steel for a low-temperature pressure vessel by deslagging and slag splashing, which realizes production increase and cost reduction of 9Ni steel for producing and smelting the low-temperature pressure vessel.
In order to realize the purpose of the invention, the invention specifically adopts the following technical scheme:
the method for improving the yield of the 9Ni steel for the low-temperature pressure container is characterized by comprising the following steps of:
adding waste molten iron and steel, blowing, tapping, and keeping 500-1500 kg of molten steel in a furnace;
step two, pouring slag immediately after tapping, pouring most of the upper layer slag in the furnace, and keeping the slag amount at 500-2000 kg;
the specific slag amount is determined according to the oxygen content and the temperature of the molten steel converting end point, and the lower the oxygen content and the higher the temperature of the molten steel are, the less the slag amount is left. Excessive slag amount can cause carbon pulling difficulty at the blowing end point, and abnormal blowing is caused.
Step three, lifting the furnace to splash slag, wherein the adding amount of slag splashing materials and slag splashing time are determined according to the amount of remaining slag, and the lower the amount of remaining slag is, the less the adding amount of the slag splashing materials is, and the shorter the slag splashing time is;
step four, adding lime thickened slag in the last stage of slag splashing, and immediately lifting the gun after adding lime;
and fifthly, carrying out next molten steel furnace operation, and repeating the first step to the fifth step until the production is finished.
Preferably, the addition amount of the slag splashing material is 100-250 kg, and the slag splashing time is 100-170 s.
Preferably, the adding amount of the lime is 500-1100 kg.
Preferably, the terminal angle of the deslagging and furnace shaking is 108-112 degrees.
Preferably, the blowing process adopts a blowing mode of large flow at the early stage, medium flow at the middle stage and large flow at the later stage, wherein the oxygen supply flow at the early stage of blowing is 35000-36000Nm3The oxygen supply flow in the middle stage of blowing is 30000-32000Nm3The oxygen supply flow rate in the later stage of blowing is 35000-3。
The invention keeps a small amount of molten steel in the previous furnace not to be discharged in the tapping process, avoids slag, ensures the component accuracy of the molten steel in the previous furnace, improves the tapping amount of the molten steel in the next furnace, reduces the loss of 9Ni molten steel to the maximum extent, and greatly improves the yield of the molten steel.
The invention adopts a blowing mode of slag dumping and slag splashing to break through, the slag dumping operation is firstly carried out after the steel tapping of the previous furnace is finished, most of the extremely-peroxy furnace slag generated by 9Ni steel production is dumped, only a small part of the slag splashing of the furnace slag is reserved, the furnace protection effect can be realized, the addition amount of the slag splashing material can be greatly reduced, the production cost is reduced, the slag splashing time is reduced, the 9Ni steel smelting period is shortened, and the production efficiency and the benefit are greatly improved.
According to the invention, a mode that a small amount of molten steel is reserved in the furnace in the tapping process, and the slag is poured and splashed first is adopted, so that a small part of slag and the incomplete molten steel are reserved in the furnace, the yield of the 9Ni steel for the low-temperature pressure container can be improved, the consumption of the 9Ni steel for producing the steel iron material is reduced to the greatest extent, the blowing difficulty of the low-carbon and low-phosphorus 9Ni steel is reduced, the addition amount of the splashed slag material required by slag splashing is greatly reduced, and the purpose of production and cost reduction of the 9Ni steel for producing and smelting the low-temperature pressure container is achieved.
The invention has the following beneficial effects:
1. compared with the traditional slag splashing and deslagging production, the average furnace yield is obviously improved, and the furnace yield is improved by 3-8% with the same loading amount;
2. the invention obviously reduces the usage amount of slag splashing and greatly reduces the production cost;
3. the method can effectively avoid the abnormal decarburization caused by the temperature rise at the blowing end point due to the slag splashing of a large amount of slag, greatly reduce the number of times of igniting the lance and improve the one-turn hit rate of 9Ni steel production.
Drawings
FIG. 1 is a graph showing the average furnace yield and the slag splashing consumption of a 9Ni steel comparison experiment for producing a low-temperature pressure vessel by using the conventional method and the method of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention. On the contrary, the invention is intended to cover alternatives, modifications, equivalents and alternatives which may be included within the spirit and scope of the invention as defined by the appended claims. Furthermore, in the following detailed description of the present invention, certain specific details are set forth in order to provide a better understanding of the present invention. It will be apparent to one skilled in the art that the present invention may be practiced without these specific details.
The invention is further described with reference to the following figures and specific examples, which are not intended to be limiting. It is worth noting that the molten iron components can seriously affect the slag splashing and overflowing situation in the smelting process, and further affect the furnace yield of each furnace of steel, so that the comparative example selects the molten iron with the same components as those in the examples as the premise of comparison, only the slag remaining is used as the difference, and the comparative authenticity can be reflected.
The following are an example and a comparative example of the present invention, in which the charged molten iron components and physical temperatures of example 1 and comparative example 1 are substantially the same, and the charged molten iron components and physical temperatures of example 2 and comparative example 2 are substantially the same.
Example 1
In the embodiment, the charging amounts of the scrap steel and the molten iron are respectively 35.76t and 138.4t, the slag is directly poured after the tapping of the previous furnace is finished, the residual molten steel amount in the furnace is about 500kg, the terminal angle of the slag pouring and rocking furnace is 112 degrees, and the residual slag amount is about 1.5 t.
Determining the addition amount of slag splashing materials and slag splashing time according to the amount of remaining slag, determining the addition amount of the slag splashing materials to be 170kg and the slag splashing time to be 135s through optimizing parameters, adding 900kg of lime when slag splashing is about to end, and then lifting a gun.
Adding waste steel water and then carrying out next furnace blowing, wherein due to the extremely low carbon content and phosphorus content of the 9Ni molten steel, the blowing adopts a large-medium-large blowing mode with large flow in the early stage, large flow in the middle stage and large flow in the later stage, and the oxygen supply flow in the early stage of blowing is 35000-36000Nm3The oxygen supply flow in the middle stage of blowing is 30000-32000Nm3The oxygen supply flow rate in the later stage of blowing is 35000-3The slag is melted as well as possible while ensuring decarburization.
And strictly executing double-gear operation in the tapping process, observing the change of the molten steel flow, and immediately closing the sliding plate to finish tapping after the molten steel flow is collected.
Directly deslagging after lifting the furnace, and determining the amount of slag left in the furnace according to the oxygen content and the temperature at the blowing end point of the furnace.
Example 2
The charging amounts of the scrap steel and the molten iron are respectively 35.36t and 138t, the slag is directly poured after the tapping of the previous furnace is finished, the residual molten steel amount in the furnace is about 500kg, the terminal angle of the slag pouring and shaking furnace is 111 degrees, and the slag remaining amount is about 1.8 t.
Determining the addition amount of the slag splashing material and the slag splashing time according to the residual slag amount, determining the addition amount of the slag splashing material to be 200kg and the slag splashing time to be 161s through optimizing parameters, adding 1011kg of lime when slag splashing is about to end, and then lifting the gun.
Adding waste steel water and then blowing, adopting a blowing mode of large, medium and large, wherein the oxygen supply flow in the early stage of blowing is 35000-3The oxygen supply flow in the middle stage of blowing is 30000-32000Nm3The oxygen supply flow rate in the later stage of blowing is 35000-3The slag is melted as well as possible while ensuring decarburization.
And strictly executing double-gear operation in the tapping process, observing the change of the molten steel flow, and immediately closing the sliding plate to finish tapping after the molten steel flow is collected.
Directly deslagging after lifting the furnace, and determining the amount of slag left in the furnace according to the oxygen content and the temperature at the blowing end point of the furnace.
Comparative example 1
In the embodiment, the charging amounts of the scrap steel and the molten iron are respectively 35.5t and 137.8t, and the slag is splashed by lifting the furnace after the tapping of the previous furnace is finished and is completely poured out.
And determining the adding amount of slag splashing materials and the slag splashing time according to the amount and viscosity of the furnace slag, and determining the adding amount of the slag splashing materials to be 1039kg and the slag splashing time to be 307s through optimizing parameters. And after slag splashing is finished, lifting the gun to pour out all slag.
The blowing was carried out after the addition of the iron and steel scrap, and the same blowing mode of "large, medium and large" as in example 1 was adopted to ensure decarburization and to melt slag as well as possible.
And strictly executing double-gear operation in the tapping process, observing the change of the molten steel flow, and immediately closing the sliding plate to finish tapping after the molten steel flow is collected.
And determining a slag splashing mode according to the blowing steel grade of the lower furnace.
Comparative example 2
In the embodiment, the charging amounts of the scrap steel and the molten iron are 35.88t and 138.1t respectively, and slag is splashed by lifting the furnace after the tapping of the previous furnace is finished and all the scrap steel and the molten iron are poured out.
And determining the addition amount and the slag splashing time of slag materials according to the amount and the viscosity of the furnace slag, and determining the addition amount of the slag splashing materials to be 1267kg and the slag splashing time to be 257s through optimizing parameters. And after slag splashing is finished, lifting the gun to pour out all slag.
The blowing was carried out after the addition of the waste molten iron and steel, and the same blowing mode of "large, medium and large" as in example 2 was adopted, whereby the slag melting was carried out as well as possible while the decarburization was ensured.
And strictly executing double-gear operation in the tapping process, observing the change of the molten steel flow, and immediately closing the sliding plate to finish tapping after the molten steel flow is collected.
And determining a slag splashing mode according to the blowing steel grade of the lower furnace.
The experimental comparison results are shown in table 1:
TABLE 1 comparison of furnace output and slag splash consumption for the examples and comparative examples
| Total load (t) | Furnace product (t) | Consumption of slag splashes (kg) | |
| Example 1 | 174.16 | 164.3 | 170 |
| Comparative example 1 | 173.3 | 153.38 | 1039 |
| Example 2 | 173.36 | 168.94 | 200 |
| Comparative example 2 | 173.98 | 164.23 | 1267 |
Compared with the traditional production method, the nickel-based steel produced by the novel method has the advantages that the average furnace yield is 3-8%, the slag splashing consumption required by the novel method is obviously reduced, and the purpose of increasing the yield and reducing the cost of producing and smelting 9Ni steel for the low-temperature pressure container is achieved.
The above is only a part of the specific production and smelting embodiments of 9Ni for a low-temperature pressure vessel according to the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art can substitute similar materials, devices or adjust related technical parameters within the technical scope of the present invention.
Claims (5)
1. The method for improving the yield of the 9Ni steel for the low-temperature pressure container is characterized by comprising the following steps of:
adding waste molten iron and steel, blowing, tapping, and keeping 500-1500 kg of molten steel in a furnace;
step two, pouring slag immediately after tapping, pouring most of the upper layer slag in the furnace, and keeping the slag amount at 500-2000 kg;
step three, lifting the furnace to splash slag, wherein the adding amount of slag splashing materials and the slag splashing time are determined according to the amount of remaining slag, and the lower the amount of remaining slag is, the less the adding amount of slag splashing materials is, and the shorter the slag splashing time is;
step four, adding lime thickened slag in the last stage of slag splashing, and immediately lifting the gun after adding lime;
and fifthly, carrying out next molten steel furnace operation, and repeating the first step to the fifth step until the production is finished.
2. The method for increasing the yield of 9Ni steel for a low-temperature pressure vessel as claimed in claim 1, wherein the amount of slag splashing material is 100-250 kg, and the slag splashing time is 100-170 s.
3. The method for increasing the yield of 9Ni steel for a low-temperature pressure vessel as claimed in claim 1, wherein the amount of lime added is 500 to 1100 kg.
4. The method for increasing the yield of 9Ni steel for a low-temperature pressure vessel as claimed in claim 1, wherein the deslagging and furnace shaking end point angle is 108-112 degrees.
5. The method for increasing the yield of 9Ni steel for a cryogenic pressure vessel as defined in claim 1, wherein the blowing process employs a blowing mode of large flow rate at the early stage, medium flow rate at the middle stage and large flow rate at the later stage, wherein the oxygen supply flow rate at the early stage of the blowing is 35000 and 36000Nm3The oxygen supply flow in the middle stage of blowing is 30000-32000Nm3The oxygen supply flow rate in the later stage of blowing is 35000-3。
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| CN101775460A (en) * | 2010-03-23 | 2010-07-14 | 武钢集团昆明钢铁股份有限公司 | Electric furnace steelmaking method using 100% low-quality tunnel kiln direct reduced iron as raw material |
| CN102732777A (en) * | 2012-06-07 | 2012-10-17 | 承德建龙特殊钢有限公司 | Production method of low P, S and Ti steel |
| CN102776314A (en) * | 2012-07-24 | 2012-11-14 | 钢铁研究总院 | Smelting method of ultra-low phosphorus steel |
| CN108251592A (en) * | 2018-01-19 | 2018-07-06 | 山东钢铁集团日照有限公司 | A kind of converter smelting method of extremely low phosphoretic steel |
| CN112646944A (en) * | 2020-12-02 | 2021-04-13 | 扬州圣莱特冶金科技有限公司 | Converter less-slag smelting method |
| WO2021197166A1 (en) * | 2020-03-31 | 2021-10-07 | 宝山钢铁股份有限公司 | Automatic slag pouring method and system for slag reserving process of converter |
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2022
- 2022-04-02 CN CN202210350209.5A patent/CN114686636A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101775460A (en) * | 2010-03-23 | 2010-07-14 | 武钢集团昆明钢铁股份有限公司 | Electric furnace steelmaking method using 100% low-quality tunnel kiln direct reduced iron as raw material |
| CN102732777A (en) * | 2012-06-07 | 2012-10-17 | 承德建龙特殊钢有限公司 | Production method of low P, S and Ti steel |
| CN102776314A (en) * | 2012-07-24 | 2012-11-14 | 钢铁研究总院 | Smelting method of ultra-low phosphorus steel |
| CN108251592A (en) * | 2018-01-19 | 2018-07-06 | 山东钢铁集团日照有限公司 | A kind of converter smelting method of extremely low phosphoretic steel |
| WO2021197166A1 (en) * | 2020-03-31 | 2021-10-07 | 宝山钢铁股份有限公司 | Automatic slag pouring method and system for slag reserving process of converter |
| CN112646944A (en) * | 2020-12-02 | 2021-04-13 | 扬州圣莱特冶金科技有限公司 | Converter less-slag smelting method |
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Application publication date: 20220701 |