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Segment Purge Plug in Process of Molten Metal Treatment¹

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Product Description Product DescriptionSegment purge plug in process of molten metal treatmentIn steel-making today, gas blowing in a ladle is indispensable for improvement of steel quality and for continuous casting.In metallurgy, it can be used in the process of molten metal treatment.SNREF purging plug is characterized by their high strength, good erosion resistance and corrosion resistance, high blowing rate and good safety. They are widely used for continuous casting ladles and refining ladles. PRODUCT OVERVIEWPurging plug, being an important element in high temperature refining metallurgy, having been widely usedin many industries, such as iron and steel, ferro alloy, non-ferrous metals etc. We have more than 20 years production experience in purging plug and housing block, with annualpoduction capacity over 50,000 sets. For many years, we are in the leading position for researching and producing high quality purging blowingproducts in China. According to years experience of on site inspection, we have successfully developpedmany types of purging plug, including slit type, segment type(plate type), porous type.Adopting unique forming workmanship, special maintenance method, high temperature firing technology,our purging products come with feature of long service life, high blowing rate, safe and reliable.Our purging products have been widely recognized by domestic and abroad large and medium-sized steelmills with excellent performance feedback. PRODUCT TYPE AND PERFORMANCEWith the development of ladle refining technology and ladle lining refractories, higher requirements areimposed on the blowing rate and lifetime of purging refractories.In order to meet the metallurgical needs of different steel types and different refining processes (RH, LF, VD,VOD, VAD, CAS, ANS), we have developed the following series of purging refractories. Hot Sales Types-Slot Plug(slit plug)1. Slot plug is the most common structure in purging plug.The gas channel could be designed and customized according to actual on-site using conditions, including refining steel grade,refining workmanship, ladle capacity, temperature, hydrostatic pressure of liquid steel etc.This can achieve the best blowing effect for purging plugs, ensure the longest service life, safety, stability and best airpermeability. 2. Material and Chemical CompositionAt present, the widely-adopted purging plug is slit type, materials chromite corundum spinel or corundum spinel. The technicalparameter as per below:Adopting high quality materials with good feature of anti liquid steel and slag erosion, in order to ensure the blowingthough performance of purging plug.Through constant research on optimization of matrix composition and production process, ensuring the unifirm structure,good volume stability, good anti slag penetration and slag corrosion feature, good high temperature strength, in order towithstand the flushing from high temperature airflow and liquid steel. Our slit plug also comes with excellent thermal shockresistance, in order to avoid the reduction of air blowing rate caused by latered peeling or fracture under high temperature.The main feature for slit plug is high blowing rate, wide adjustable range of flow rate, easier for operation control duringrefining process.By selecting different raw materials and workmanship, we can produce slit plug with flow rate ranges from 12% to 20%, lowtemperature/medium temperature/high temperature various type plugs to meet different application conditions. Application characteristics:Slit plug is the most widely used purging plug in China. Produced by vibration casting and molding of high performancecorundum spinel castable, firing under high temperature, high temperature strength, excellent high temperature erosionresistance and easy production procedure, with much wider adjustable range of on-site refining operation flow.-Porous plugPorous plug has better porosity and permeability.Production technology is adding carbon-containing compound into mixture, since carbon-containing compound can burn out withoutresidue at low temperature, so we adopt low temperature burning out intermediate materials to get the initial porosity.In porous type plug, inside distributes interpenetrating gas channels in different sizes.When blowing stop, the steel and slag from ladle will infiltrate into the deep areas of the plug, to form a secure layer on working surface. Material and Chemical CompositionPorous plug has better porosity and permeability.Production technology is adding carbon-containing compound into mixture, since carbon-containing compound can burn outwithout residue at low temperature, so we adopt low temperature burning out intermediate materials to get the initial porosity.In porous type plug, inside distributes interpenetrating gas channels in different sizes.When blowing stops, the steel and slag from ladle will infiltrate into the deep areas of the plug, to form a secure layer onworking surface. Application characteristics:Resistant to slagIn order to increase resistance ability to slag and liquid steel penetration, Cr2O3 or chromium corundum is always added intocorundum spinel. Cr2O3 has the same crystal structure with a-Al2O3, the adding of Cr2O3 can effectivelyimprove the slag resistance ability of materials, also can improve the gas channel blocking condition caused by liquid steelpenetration.The aluminum-chrome solid solution and independent chrome-bearing glass phase which were formed by Cr2O3 fine powderand Al2O3 under high temperature, can form into liquid phase with certain viscosity, when meet with the slag in steel smeltingprocess. This liquid phase can avoid the slag erosion to porous plugs, and also absorbthe Iron oxide and magnesium oxide, forming dense spinel on plug's working surface, thus further improve the slag resistanceof the plug.Thermal shock resistantThe main damage to porous plug is thermal shock. As the tapping temperature increasing, there existing big temperature gaponto working surface during work and break. After introducing spinel phase into the structure, the thermal resistance ofpurging plug is increased significantly.The oxide and non-oxide added into porous plug will form into solid solution phase with aggregate under high temperature,which will increase the high temperature strength, air permeability, resistance to slags of the plug.After high temperature burning for the plug, the performance is increased to meet different steelmaking conditions.-Segment PlugThe segment plug is preferably made of good anti-stripping materials, the block body is not easy to occur fracture, with longer service life. The cracks between different plates will not expand, so this segment plug design can avoid failure of bottom blowing caused by tranverse brick fracture.Application characteristics: In order to adapt to more and more strict refining conditions(especially special steel), and to meet the requirements of increasing ladle life, the volume of plug becomes bigger and bigger. However the traditional slit type plug has single material and single structure, easy to cause the phenomenon of tranverse fracture and failure of air blowing. Our researched segment plug has successfully soved the problem of fracture existing in traditional slit plug. Significantly increasing the stability of refining process, ensuring the realization and improvement of quality refined steel. Compared with traditional slit plug, our sgement plug obtains below advantages:-1 Simultaneous improving the plugs' thermal shock resistance and erosion resistance.-2 The design of segment(plate) and compsition structure obtains good thermal conductivity and low stress characteristic,significantly increase the air blowing rate.-3 Stable flowing rate, good blowing through performance, higher stability in refining process operation.-4 Almost no fracture layer, reducing the labour strength during oxygen cleaning of plugs after casting.-5 Lifetime much increased, synchronized with the slag line.Picture 3 shows the comparison on thermal stress between slit type plug and segment plug.Conclusion: After argon blowing finishes, the max thermal stress for slit type is 356.55MPa, while thermal stress for segment plugis significantly reduced to 111.93MPa, stress reduced 69%.The thermal stress for slit and segment plug is equally the same after heating and steel tapping finishes, but after argon blowing, thestructure of segment composite type is much better than slit type plug.Corundum-Mullite Corundum-Spinel Corundum-Spinel-Hybrid PlugSecondary refining technology is the most important part in steelmaking processIt can adjust the steel alloy type and liquid temperature.Purging plug and block is the key functional component to make this process carried out.As the ladle tends to develop in larger scale, the melting temperature and time have been improved significantly, which makes theusing environment for refractory materials more and more strict. Therefore, it is necessary to further improve the performance ofpurging plugs and blocks to meet the increasing demands in current steelmaking technology-Overall breathable brick:This product adopts high purity raw materials, through vibration casting and low temperature heating process workmanship.Function is blowing argon gas via purge plug to ladle.With the feature of high strength, good thermal stability, erosion resistance and abrasion resistance.Widely used in steel plants LF, LF-VD, CAS-OB refining ladleWe manufacture various high-quality ladle refractory according to the clients' needs , and to ensure the stability and accountability of the quality.Product ParametersTechnical data will be customized according to your steel making condition. Chemical and Physical PropertiesSNLWB-85SNLWB-90SNLWB-95Al2O3 +MgO % min859095Cr2O3 (C) % min02.52.5Apparent porosity g/cm3% max151313Bulk density g/cm3 % min3.03.052.9Normal temperature Compressive strength (MPa) min80100100Breaking strength 1500°C×3hmin23Mpa 2.Well block and segment plugChemical and Physical Properties(Well block)(purging plug)AL2O3 %>=85>=85MgO%3-51-3Cr2O3 %----->2.4Bulk density g\cm3>=3.0>=2.9Apparent Porosity %<=16<=18Cold crushing strength Mpa110oC*24h>=60.0>=80.01500oC*3h>=100.0>=80.0Refractoriness under load : oC>=1680>=1680Modulus of rupture 1400oC *1h Mpa Mpa>=15.0>=15.0Linear change 1500oC*3h %±0.2±0.2air permeability, m3/hour at P=4 bar30M3/HPackaging & ShippingProduct packaging1- International standard seaworthy exportable packing.2- Wooden pallet.3- Wooden / bamboo case (box).4- Further packing information will be based on customer's requirements. Company Profile Shandong Sinorefractory New Materials Co.,Ltd (SinoRefractory)has been focusing on international marketing of flow control refractories in iron and steel industry for 17 years.SinoRefractory is the second generation of refractories export enterprise developed out of EMEI Group.Supported by one of China's largest production bases in functional refractory materials.Through years of development in the field of exporting top quality refractories to worldwide markets,SinoRefractory aims at researching,producing,marketing and exporting high standard Ladle slide gate plate,Ladle Nozzles,Well blocks,Purging plugs,Nozzle stuffing sand,Refractory castables, Slide gate Mechanisms etc.Up to now,SinoRefractory has supplied high quality refractory products and services to nearly 70 top-hundred global steel enterprises.SinoRefractory will always put clients'interest in the first place,striving to provide a wide range of services,including technical solution,pre-sales support,after-sales services,installation team support,professional know-how according to the changing of steelmaking condition,etc.We are not only selling products,we are more focused on supporting,developing and growing together with clients. FAQBelow are some RFQ and answers about ladle and tundish flow control refractories:Q: What are the requirements for refractories for ladle?A: The requirements of refractories for ladle mainly include: * high temperature resistance * thermal shock resistance * resistance to the erosion of the slag * high temperature with sufficient mechanical strength * the lining has a certain degree of expansionQ:What are the reasons for the destruction of refractories for ladle?A: The main causes of damage are as follows:When the ladle transports high-temperature molten steel, the high-temperature molten steel and slag at about 1680oC scour and erode it, especially in the slag line part, the scouring and erosion is more serious, and it is an important factor to decide the service life of the ladle.LF and other extra-oven refining treatment on the unburnt brick damage is serious.Q:What steel grades are different materials of slide plate bricks suitable for respectively?A: Different materials of slide plate bricks are applicable to different steel grades. For example, Al2O3-ZrO2-C slide gate plate can be used as ladle sliding gate plate due to its excellent erosion resistance and thermal shock stability, which can adapt to the casting of various steel grades, and ther are the following materilas based on customer's steel making condition: the MgO-C, MgO-Al-C, MgO-Al-C, MgO-Al-C, MgO-Al-C, MgO-Al-C, MgO-Al-C, MgO-Al-C, MgO-Al-C, and so on. For more details, feel free to send inquiry to us.

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