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38results about How to "Solve nodules" patented technology
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Production tech. of low carbon low silicon aluminium killed steel
InactiveCN100999770AReduce manufacturing costSolve the problem of aluminum oxide nodulesManufacturing convertersSlagSilicon
The present invention relates to metallurgical technology, and is especially one low carbon and low silicon aluminum-killed steel producing process with converter and continuous small square billet casting machine. The technological scheme is that the low carbon and low silicon aluminum-killed steel producing process includes making steel with molten iron in a converter pre-slagging during tapping, deeply deoxidizing, slag forming fining, soft blowing fining and calcium treatment in an argon blowing station, and final protected casting in a continuous small square billet casting machine. The present invention has lowered production cost.
Owner:武钢集团有限公司
Continuous casting tundish diffuse-type gas-permeable ring upper nozzle brick cup and argon blowing refining method thereof
The invention relates to a continuous casting tundish diffuse-type gas-permeable ring upper nozzle brick cup and an argon blowing refining method thereof. The upper nozzle brick cup comprises an upper nozzle brick cup body, diffuse-type gas-permeable rings, a gas chamber and a gas inlet pipe, wherein the gas-permeable rings are uniformly arranged in a circle; the gas-permeable rings and the circular gas chamber are arranged in the upper nozzle brick cup body; the air chamber is arranged at the bottoms of the diffuse-type gas-permeable rings and communicate with the diffuse-type gas-permeable rings; the upper parts of the gas-permeable rings extend out of the upper surface of the upper nozzle brick cup body by 5 to 10 mm; the gas inlet pipe is connected to one side part of the gas chamber; one end of the gas inlet pipe communicates with the air chamber; the other end of the gas inlet pipe extends out of one side part of the upper nozzle brick cup body, is connected with a metal pipe fitting and communicates with an external argon gas source; an upward circular air curtain barrier is formed after argon gas is blown into the gas inlet pipe, so that gas washing of molten steel entering an upper nozzle is realized, and floating and removing of inclusions are promoted; and a certain quantity of argon bubbles enter the upper nozzle along with a steel flow, so that a stable and continuous circular gas flow is formed, which not only solves the problem of nozzle clogging, but also solves the technical problem that protective argon bubbles enter steel to cause sub-surface bubbles of a casting blank.
Owner:LAIWU STEEL YINSHAN SECTION CO LTD
Smelting method for low-carbon low-silicon wire-welding steel
ActiveCN104862443AGood welding performanceSolve the problem of nodulation in submerged nozzlesManufacturing convertersOxygen contentRegular Production
The invention discloses a smelting method for low-carbon low-silicon wire-welding steel. The process flow of the smelting method comprises the following procedures: pretreatment and desulphurization of molten iron; treatment in a converter; LF refining; and continuous casting of small square billet with a size of 150 mm * 150 mm. With the smelting method, carbon content is stably controlled to be less than or equal to 0.08%; silicon content is stably controlled to be less than or equal to 0.027%; total oxygen content is no more than 0.0040%; the problem of nozzle clogging is overcome; and surface and internal quality of a casting blank is greatly improved. The process flow of the smelting method is simple and has low cost; and equipment used in the smelting method is conventional production equipment for iron and steel manufacture, is simple to operate, has good versatility and saves energy.
Owner:QINGDAO SPECIAL STEEL CO LTD
Continuous casting tundish breathable ceramic tube upper nozzle brick cup and argon blowing refining method thereof
The invention relates to a continuous casting tundish breathable ceramic tube upper nozzle brick cup and an argon blowing refining method thereof. The upper nozzle brick cup comprises an upper nozzle brick cup body, a plurality of ceramic tubes, a gas chamber and a gas inlet pipe, wherein the ceramic tubes are uniformly arranged in a circle; the ceramic tubes and the circular gas chamber are arranged in the upper nozzle brick cup body; a plurality of sockets are uniformly arranged on the gas chamber in a circle; the top ends of the ceramic tubes extend out of the upper surface of the upper nozzle brick cup body by 5 to 10 mm; the lower ends of the ceramic tubes are fixed in the sockets on the gas chamber, and communicate with the gas chamber; the gas inlet pipe is connected to one side part of the gas chamber, and communicates with an external argon gas source by being connected with a metal pipe fitting; an upward circular air curtain barrier is formed after argon gas is blown into the gas inlet pipe, so that gas washing of molten steel entering an upper nozzle is realized; and a certain quantity of argon bubbles enter the upper nozzle along with a steel flow, so that a stable and continuous circular gas flow is formed, which not only solves the problem of nozzle clogging, but also solves the technical problem that protective argon bubbles enter steel to cause sub-surface bubbles of a casting blank.
Owner:SHANDONG IRON & STEEL CO LTD
Low-carbon free-cutting sulfur narrow strip steel and production method thereof
ActiveCN109055853AQuality improvementAvoid it happening againProcess efficiency improvementMetal rolling arrangementsSlagStrip steel
The invention belongs to the technical field of production of strip steel of plates, and particularly relates to low-carbon free-cutting sulfur narrow strip steel and a production method thereof. Thelow-carbon free-cutting sulfur narrow strip steel is characterized in that the carbon and oxygen equilibrium in molten steel is controlled to omega [C].omega[O]<=6.5*10<-4>. The invention further provides the production method of the low-carbon free-cutting sulfur narrow strip steel. Under the condition that the carbon and oxygen equilibrium in molten steel is controlled to omega [C].omega[O]<=6.5*10<-4>, subsurface bubbles of a cast blank can be avoided, and the surface quality of the cast blank is improved. In the refining process, the molten steel is deoxidized through a Ca feeding line, sothat CaO inclusions generated in the deoxidization process are small, spindle-shaped MnS can be formed, and thus, the cutability of the steel is improved. Meanwhile, scabbing of a continuous castingnozzle, slag entrapment of a crystallizer, steel leakage during continuous casting and cracks of rolled products are avoided, and the sulfur content and the oxygen content are controlled.
Owner:SHANDONG IRON & STEEL CO LTD
Process for manufacturing novel hearth roll collar with laser clad composite coating
ActiveCN103774135AExtended service lifeSaves roll change time and maintenance timeMetallic material coating processesTemperature resistancePre treatment
The invention provides a process for manufacturing a novel hearth roll collar with a laser cladcomposite coating. The process comprises the following steps: (1) casting a roll collar by adopting a horizontal centrifugal casting method; (2) finishing the surface to be reinforced of the roll collar; (3) pretreating the surface of the roll collar of the hearth roll of a heating furnace; (4) selecting nickel-based alloy powder as a base coat of the roll collar surface; (5) cladding the base alloy by utilizing high-power CO2 laser complete equipment; (6) coating the roll collar surface with a layer of high temperature resistance alloy powder serving as a high temperature resistance alloy coating; (7) cladding the high temperature resistance alloy coating by utilizing the high power CO2 laser complete equipment; (8) detecting the performance of the composite coating; (9) machining the roll collar surface to a required size. According to the novel high temperature resistance abrasion-resistance hearth roll collar provided by the invention, the roll collar surface is reinforced, the service life of the roll collar can be greatly prolonged, the problem of nodules on the roll collar surface can be basically solved, the roll replacing and maintaining time can be saved, the operation efficiency of the heating furnace can be improved, and the production cost can be reduced.
Owner:江苏点金激光科技有限公司
Preparation method of aluminum-calcium alloy used for vacuum refining molten steel deoxidation and device thereof
The invention discloses a preparation method of aluminum-calcium alloy used for vacuum refining molten steel deoxidation and a device thereof; the high-purity aluminum and calcium are used as the raw material and are prepared according to the weight percent as follows: 70-90 percent of aluminum and 10-30 percent calcium; the calcium is added to the aluminum which is molten by a low-frequency sensing induction furnace, the aluminum and the calcium are molten for 30-40 minutes under the protection of argon gas and then cast into an ingot; after being cooled, the ingot is broken into blocks to prepare the aluminum-calcium alloy. The invention has the advantages that the alloy has high purity and high calcium content and is used for vacuum refining molten steel deoxidation; the deoxidation and calcium can be completed in one step; the O, C, N, S ingredients in the steel are ensured not to exceed the standard requirement; meanwhile, the Al2O3 inclusion content in the steel is greatly reduced, thereby having the obvious effects of reducing nodulation at a pouring water gap and improving steel quality.
Owner:郭庆成
Corrosion-resistant rare earth bearing steel and preparation method thereof
InactiveCN111254359AImprove internal qualityImprove corrosion resistanceProcess efficiency improvementElectric furnaceCorrosionTa element
The invention relates to corrosion-resistant rare earth bearing steel and a preparation method of the corrosion-resistant rare earth bearing steel. The corrosion-resistant rare earth bearing steel comprises the following components of, by weight percentage, 0.90-1.10wt% of C, 0.20-0.40wt% of Si, 0.20-0.50wt% of Mn, 1.35-1.70wt% of Cr, 0.12-0.26wt% of Cu, 0.015-0.035wt% of Alt, P<=0.020wt%, S<=0.010wt%, 0.003-0.005wt% of a rare earth alloy, and the balance of Fe and inevitable impurities. By adding trace rare earth, the sizes of inclusions are refined, the number of the inclusions is reduced, and the fatigue life of the bearing steel is remarkably prolonged; and meanwhile by adding the element Cu, the corrosion resistance of the bearing steel is improved, and the surface quality of thebearing steel is remarkably improved.
Owner:SHANDONG IRON & STEEL CO LTD
Surface coating for furnace roller of continuous annealing furnace and after-treatment method thereof
Owner:宝钢日铁汽车板有限公司
High temperature and wear resistant double-layer composite hearth roll
InactiveCN104099459AHigh strengthSmall thermal expansionCharge manipulationFurnace typesTemperature resistanceSurface oxidation
The invention discloses a high temperature and wear resistant double-layer composite hearth roll, which comprises a roller and roll shafts connected to both ends of the roller. The roll shafts are inserted into the ends of the roller to form cooperation and fixed connection. The roller is a double-layer composite cylinder, which is formed by compounding of an inner alloy layer and an outer quartz ceramic layer covering the alloy layer. Further improvements lie in that: two positioning pins radially running through cooperating parts of the roller and the roll shafts are disposed at the cooperating parts of the roller and the roll shafts, and one of the positioning pins partially runs through the other positioning pin. The double-layer composite hearth roll provided by the invention has the characteristics of high strength, high temperature resistance, low thermal expansion, good chemical stability, stable high temperature performance, no deformation, smooth and delicate surface, and good wear resistance, etc., the problems of roll surface oxidation and furnace roll nodulation are well solved, and loosening and peeling phenomena cannot come into being. The roller and the roll shafts are in reliable connection, and the connection strength is high, so that the double-layer composite hearth roll provided by the invention has high structural strength.
Owner:江苏华海冶金机械设备有限公司
A continuous casting tundish breathable ceramic tube upper nozzle seat brick and argon blowing refining method thereof
Owner:SHANDONG IRON & STEEL CO LTD
Novel furnace top cooling device for oxygen-enriched side copper blowing smelting furnace
ActiveCN107955884AEasy to installEasy maintenanceRotary drum furnacesCrucible furnacesHeat lossesEngineering
The invention provides a furnace top cooling device for an oxygen-enriched side copper blowing smelting furnace, and belongs to the technical field of copper smelting equipment. The device is characterized by being composed of a plurality of air cooling walls connected in series and a water cooling wall, wherein an air duct is reserved in each air cooling wall; an air inlet and an air outlet are formed in the two ends of each air cooling wall; the adjacent air cooling walls are connected into a whole in series through connecting pipelines; the air cooling wall at the leftmost side is providedwith a row of the air outlets which are opposite to the inside of a furnace body; the water cooling wall is installed close to the air cooling wall at the leftmost side; a flue outlet is formed in theleft side of the water cooling wall; and a furnace top plane composed of all the cooling walls is covered with a layer of fire-resistant ramming material. According to the furnace top cooling devicefor the oxygen-enriched side copper blowing smelting furnace, the air is used for cooling the furnace top cooling device; and the preheated air is used as secondary air so as to effectively reduce heat loss of the furnace body, and the problem that nodulation in the furnace is caused due to the fact that low-temperature secondary air enters the furnace is solved.
Owner:CHIFENG FUBANG COPPER
Method for improving surface quality of P-containing high-strength IF steel continuous annealing sheet
ActiveCN110026433ASolve nodulesReduce surface enrichmentTemperature control deviceFurnace typesMolten steelContinuous annealing
The invention discloses a method for improving the surface quality of a P-containing high-strength IF steel continuous annealing sheet, and belongs to the technical field of steel rolling. The methodcomprises the following steps of smelting and continuously casting molten steel to obtain a slab, heating the slab, then carrying out rough rolling and finish rolling to obtain a hot rolled sheet, then carrying out acid pickling, cold rolling and continuous annealing on the hot rolled sheet, and coiling the continuously-annealed sheet into a finished product, wherein the molten steel comprises thefollowing components of less than or equal to 0.003wt% of C, less than or equal to 0.1wt% of Si, less than or equal to 0.1wt% of Cr, less than or equal to 0.5wt% of Mn, less than or equal to 0.05wt%of Al, and less than or equal to 0.04-0.08wt% of P; and the heating temperature of the slab is 1150-1200 DEG C, the finish rolling inlet temperature is 980-1000 DEG C, the continuous annealing dew point temperature is minus 40 DEG C-minus 30 DEG C, and the soaking temperature is 780 DEG C-800 DEG C. According to the method, the defects of the surface pitting of the hot rolled sheet and the surfacepinpoint of the continuous annealing sheet in the preparation process of the P-containing high-strength IF steel continuous annealing sheet can be overcome, the surface quality of the product can beremarkably improved under the condition that the equipment cost is not increased.
Owner:SHOUGANG CORPORATION +1
Laser cladding treatment process for heating furnace hearth roll collar surface
InactiveCN106337178AGood high temperature wear resistanceExcellent high temperature oxidation resistanceMetallic material coating processesBroadbandAlloy
The invention relates to a laser cladding treatment process for a heating furnace hearth roll collar surface. The process comprises the steps of: cleaning a heating furnace hearth roll collar surface; conveying Co based alloy powder by a coaxial or paraxial powder feeding mode, selecting a carbon dioxide laser to rapidly scan the cleaned roll collar surface by means of narrowband or broadband scanning so as to realize alloying treatment of the heating furnace hearth roll collar surface, thus obtaining an alloying layer; and conducting crack and flaw detection and judging whether crack is produced. The process provided by the invention reinforces the hearth roll collar surface, improves the service life of the roll collar, basically solves the problem of nodulation on the roll collar surface, saves the roll changing time and maintenance time, improves the heating furnace work efficiency, and reduces the production cost.
Owner:WUHAN DIANJIN LASER TECH
Anti-scaffolding furnace bottom roller used for steel rolling and manufacturing method thereof
The invention relates to the field of steel rolling equipment, in particular to an anti-scaffolding furnace bottom roller used for steel rolling and a manufacturing method of the anti-scaffolding furnace bottom roller. The anti-scaffolding furnace bottom roller used for the steel rolling comprises a furnace bottom roller body in a cylindrical shape, supporting shafts are arranged at the two ends of the furnace bottom roller body, a carbon-pottery composite material layer is sleeved on the outer surface of the furnace bottom roller body, and the carbon-pottery composite material layer is sleeved or fixed on the outer surface of the furnace bottom roller body in an interference fit or bolted connection mode. Carbon-pottery composite material is adopted for manufacturing the carbon-pottery composite material layer on the outer surface of the furnace bottom roller body, the roller body can be thoroughly isolated from oxidizing material, therefore the scaffolding problem of the roller body is solved fundamentally, meanwhile, the operation is easy, the carbon-pottery composite material layer can further be replaced, and therefore service life of the furnace bottom roller is prolonged.
Owner:烟台开发区蓝鲸金属修复有限公司
Laser surface alloying treatment process for heating furnace hearth roll collar
InactiveCN106337179AImprove hardness performanceStrong ability to maintain hardness at high temperatureMetallic material coating processesMelting tankLaser processing
The invention relates to a laser surface alloying treatment process for a heating furnace hearth roll collar. The process includes the steps of: adopting chromium nickel carbon alloy powder comprising the following components by weight percentage: 65%-80% of Cr, 17%-28% of Ni, and 3%-7% of C; selecting phi 3mm narrowband light spot or 10*1mm broadband light spot to scan the matrix; starting a CO2 laser, using a CNC laser processing machine as the work platform; employing a coaxial or paraxial powder feeding device to send the alloy powder automatically into a laser molten pool so as to form a uniform and compact alloying coating on the roll collar surface with a thickness of 0.3-0.5mm; and performing crack and flaw detection and judging whether crack is produced. The process provided by the invention reinforces the hearth roll collar surface, improves the service life of the roll collar, basically solves the problem of nodulation on the roll collar surface, saves the roll changing time and maintenance time, improves the heating furnace work efficiency, and reduces the production cost.
Owner:WUHAN DIANJIN LASER TECH
A production technology of low carbon low silicon aluminum killed steels
InactiveCN100465291CReduce manufacturing costSolve the problem of aluminum oxide nodulesManufacturing convertersSlagSilicon
Owner:武钢集团有限公司
A kind of smelting method of low carbon and low silicon welding wire steel
ActiveCN104862443BGood welding performanceSolve the problem of nodulation in submerged nozzlesManufacturing convertersOxygen contentPre treatment
Owner:QINGDAO SPECIAL STEEL CO LTD
Method for hot-dipping composite coating on steel
ActiveCN114134442AImprove bindingImprove corrosion resistanceHot-dipping/immersion processesEconomic benefitsAlloy
The invention provides a method for hot dipping of a steel material with a composite coating. The method comprises the following steps: carrying out plating assisting treatment on the pretreated steel material; carrying out hot-dip galvanizing on the steel subjected to assistant plating; and the steel obtained after hot-dip galvanizing is taken out, the interval is 3-8 s, then zinc-aluminum-based alloy is galvanized in a hot-dip mode, and the steel obtained after hot-dip plating of the composite coating is obtained after cooling. According to the method, the steel is subjected to hot dipping, a composite coating is formed on the surface of the steel, the corrosion resistance of the steel is improved, the problems of skip plating, nodulation, blistering and the like are effectively solved, and the method is easy to operate, low in cost, good in economic benefit, beneficial to industrial large-scale production and good in industrial application prospect.
Owner:INST OF PROCESS ENG CHINESE ACAD OF SCI
A continuous casting tundish dispersion-type breathable ring upper nozzle seat brick and its refining method by argon blowing
Owner:LAIWU STEEL YINSHAN SECTION CO LTD
Knot preventing high-temperature resisting sink roller
InactiveCN111378913ASolve the nodulation problemSolve nodulesHot-dipping/immersion processesMolten spray coatingCeramic coatingNichrome
The invention discloses a knot preventing high-temperature resisting sink roller. A cylindrical roller body and a roller shaft are included. The explosion spraying technology is adopted on the surfaceof the roller body to spray a metal ceramic coating. The metal ceramic coating is composed of a closing layer, a work layer and a bottoming layer from exterior to interior. According to the further improvement, the bottoming layer is MCrAlY, NiAl or NiCrAL alloy powder materials; and the closing layer is composed of 36-40% of CrB-CrO2, and the balance is an acid blender. The knot preventing high-temperature resisting sink roller resists the high temperature, and knot generation can be prevented.
Owner:江苏亚太特种铸钢厂有限公司
Oxidation-magnetization roasting system and process of refractory iron ore powder
ActiveCN106048210BFull utilization of sensible heatSensible heat utilization is reasonableCombustion chamberFluidized bed
The invention discloses an oxidizing-magnetizing roasting system and technology for refractory iron ore powder, and belongs to the technical field of metallurgy and mineral engineering. The refractory iron ore powder undergoes oxidizing roasting fully inside an oxidizing roasting furnace and then enters a circulating fluidized bed reactor for undergoing reducing magnetizing roasting, and therefore fast magnetizing roasting of the refractory iron ore powder especially the refractory iron ore powder with the small disseminated grain size is realized; roasting tail gas is completely purified by a wet dust collector and a dehydrater and then enters a combustion chamber for being utilized, and therefore the scaffolding problem of the combustion chamber is solved, normal circulation of airflow inside the combustion chamber is guaranteed, and the whole magnetizing roasting reaction progress is accelerated to a certain extent; the iron ore powder is roasted at high temperature and preheats combustion air, so that the sensible heat of the roasted iron ore powder is recycled, and utilization of the sensible heat of the roasted iron ore powder is more reasonable and fuller; and the roasting tail gas preheats coal gas through an indirect heat exchanger, so that the sensible heat of the roasting tail gas is recycled, and the utilization rate of fuel is increased.
Owner:GANSU JIU STEEL GRP HONGXING IRON & STEEL CO LTD
Corrosion resistant and anti-nodulation sink roller
InactiveCN106637024ALow flow resistanceSolve the nodulation problemHot-dipping/immersion processesEngineeringNodulations
The invention discloses a corrosion resistant and anti-nodulation sink roller comprising a cylindrical roller body and a roller shaft; the axial symmetrical center line of the roller body serves as a boundary line, and spiral grooves with opposite spiral directions are arranged on the position, on the two sides of the boundary line, of the surface of the roller body; the bottom of each spiral groove is in an arc shape; the spiral grooves become increasingly wide from the boundary line to the two sides of the roller body; and a further improvement is that a corrosion resistant layer is arranged on the surface of the roller body. By changing the widths of the spiral grooves, alloy elements of aluminum zinc and iron flow smooth in the spiral grooves, so that the problem of forming nodulations on the surface of the roller is solved thoroughly.
Owner:王秋林
Method for preparing slag washing material for producing aluminum killed steel
The invention relates to a method for preparing a slag washing material for producing aluminum killed steel. The method comprises: (1) uniformly mixing limestone, bauxite and aluminum powder, and adding potassium carbonate; and (2) placing an obtained slag material accounting for 30-50% of the total weight into a heating furnace, carrying out heating melting, adding the remaining slag material, stopping the electrifying after all the slag material is molten, naturally cooling, and physically breaking. According to the present invention, the slag system has good deoxidation ability and good desulfurization ability; and by using Al as the reducing agent and the heat generation agent, the oxidizing property of the slag is reduced, and the temperature decreasing caused by the heat absorption during the melting of the slag material added during the steel discharging process can be subjected to heat generation compensation with the heat released by the heat release reaction.
Owner:陈广新
A new type of oxygen-enriched side-blown copper smelting furnace top cooling device
ActiveCN107955884BReduce lossesIncrease self-heatingRotary drum furnacesCrucible furnacesHeat lossesEngineering
Owner:CHIFENG FUBANG COPPER
High-stability furnace bottom roller
InactiveCN111378828AHigh temperature resistantSmall thermal expansionMolten spray coatingFurnace typesThermal insulationSilicon oxide
The invention discloses a high-stability furnace bottom roller comprising a cylindrical roller body and a roller shaft. The roller body is hollow, and the roller body is sleeved with a quartz ceramicsleeve. The high-stability furnace bottom roller is characterized in that a thermal insulation coating is arranged between the quartz ceramic sleeve and the outer surface of the roller body; the thermal insulation coating is made of zirconium oxide ZrO2 or yttrium oxide Y2O3 or silicon oxide SiO2 or a mixture material thereof, and the thickness of the thermal insulation coating is 1.5-1.8 mm; andthe outer surface of the roller body is coated with the thermal insulation coating through flame spraying. The high-stability furnace bottom roller is high in stability, resistant to high temperature,good in chemical stability, stable in high-temperature performance, free of deformation and good in wear resistance, and can improve the surface quality of a steel strip.
Owner:江苏亚太特种铸钢厂有限公司
Method for manufacturing metal brush roller of roller-bottom heat treatment furnace
ActiveCN111687693AExtended service lifeTaking into account wear resistanceStatic/dynamic balance measurementBrushWear resistance
The invention relates to a method for manufacturing a metal brush roller of a roller-bottom heat treatment furnace. The method comprises the following steps: S1, a roller core and a brush belt are manufactured; S2, the brush belt is spirally wound around the surface of the roller core in the circumferential direction of the roller core to form a metal brush roller blank; S3, rough grinding is performed on the roll surface of the metal brush roll blank; S4, fine-grinding is performed on the roll surface of the metal brush roll blank; S5, grinding quality detection is performed on the metal brush roll blank; S6, rough grinding or fine grinding is performed on the metal brush roller blank with the non-standard grinding quality; S7, dynamic and static balance testing is performed on the metalbrush roller blank; and S8, balance weight adjustment is performed on the metal brush roller blank which does not meet the dynamic and static balance, the dynamic and static balance testing is performed again on the metal brush roller blank after the balance weight adjustment, and the metal brush roller blank which meets the standard in the dynamic and static balance testing is used as the metal brush roller of the roller bottom heat treatment furnace. According to the metal brush roller manufactured by the manufacturing method, due to the fact that the steel belt is used for being spirally wound around the surface of the roller core, the metal brush roller achieves the technical effects of both wear resistance and anti-tumor oxidation resistance.
Owner:广西先进铝加工创新中心有限责任公司 +1
A kind of low-carbon sulfur-based free-cutting narrow strip steel and its production method
ActiveCN109055853BQuality improvementAvoid it happening againProcess efficiency improvementMetal rolling arrangementsSlagStrip steel
The invention belongs to the technical field of production of strip steel of plates, and particularly relates to low-carbon free-cutting sulfur narrow strip steel and a production method thereof. Thelow-carbon free-cutting sulfur narrow strip steel is characterized in that the carbon and oxygen equilibrium in molten steel is controlled to omega [C].omega[O]<=6.5*10<-4>. The invention further provides the production method of the low-carbon free-cutting sulfur narrow strip steel. Under the condition that the carbon and oxygen equilibrium in molten steel is controlled to omega [C].omega[O]<=6.5*10<-4>, subsurface bubbles of a cast blank can be avoided, and the surface quality of the cast blank is improved. In the refining process, the molten steel is deoxidized through a Ca feeding line, sothat CaO inclusions generated in the deoxidization process are small, spindle-shaped MnS can be formed, and thus, the cutability of the steel is improved. Meanwhile, scabbing of a continuous castingnozzle, slag entrapment of a crystallizer, steel leakage during continuous casting and cracks of rolled products are avoided, and the sulfur content and the oxygen content are controlled.
Owner:SHANDONG IRON & STEEL CO LTD
Heat-resistant steel material for water cooled rolls of normalizing furnace
The invention relates to a heat-resistant steel material for water cooled rolls of a normalizing furnace, which belongs to the technical field of heat-resistant steel materials. The heat-resistant steel material for the water cooled rolls of the normalizing furnace is named as ZG3Cr25Ni31Al3.5Y. S and P are controlled when the heat-resistant steel material is smelted, and simultaneously aluminum is added to make up the disadvantage of wide and large crystal boundary during overfiring so as to generate aluminum micro-particles which are embedded on the crystal boundary and have ultrahigh read hardness, wherein the micro-particles are difficult to be combined with oxidized micro metal oxides of steel plates and have similar mechanism action with a ceramic layer (aluminum oxide), so the problem of salamander can be solved thoroughly.
Owner:无锡晶瑜智能机械有限公司
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