58 results about "Oxygen converter" patented technology

The invention relates to a technological process for stainless steel smelting, in particular to a process for directly producing austenitic stainless by utilizing oxide nickel. The process has the following advantages: oxide nickel of various grades is adopted to obtain different ingredients of molten nickel iron by smelting in a blast furnace and a submerged arc furnace, an electric arc furnace is cancelled as a melting unit, the chemical heat of the molten iron is utilized to melt all or part of chromium and manganese alloy, and a bottom-blowing argon-oxygen converter is utilized to dephosphorize so as to improve the dephosphorization efficiency of molten chromium iron and the obtainment yield of chromium, thereby the following series and trademarks of products, i.e. 200 series of 201, 202, J4, and the like, 300 series of 304,304L, 316,321,329, and the like, are produced; and meanwhile, all links in the whole production flows are organically combined, and various energy sources, such as coal gas, steam, afterheat, and the like are fully utilized and recycled, thereby the energy consumption is low, the secondary waste gas discharge amount not great, the production cost and the raw material cost are low, and the investment and the occupied area are not great.

The invention belongs to the field of the metallurgy technology, and relates to a steel-making method for prolonging the service life of a bottom-blowing oxygen converter through CO2. According to the method, mixed gas of O2 and CO2 serves as bottom main blowing gas, mixed gas of hydrocarbon and CO2 serves as protective gas, and the CO2 mixing proportion in the bottom-blowing mixed gas of O2 and CO2 and the mixed gas of hydrocarbon and CO2 is controlled according to different smelting stages of the bottom-blowing oxygen converter; and by means of the characteristics that CO2 reacts with iron and carbon to absorb heat, and CO2 does not contaminate molten steel, the outlet temperature of a bottom-blowing nozzle is reduced, consumption of hydrocarbon is reduced, the quality of molten steel is improved, and therefore the service life of the bottom-blowing oxygen converter is prolonged, and the smelting cost is reduced. The steel-making method is suitable for the bottom-blowing oxygen converter of 30-350 tons; and by means of the steel-making method, the bottom service life of the bottom-blowing oxygen converter can be prolonged by 300-600, the smelting cost of steel per ton can be reduced by 2-3 yuan, and the end-point molten steel carbon-oxygen equilibrium can be reduced by 0.0002-0.0004.

The invention discloses a reactor type BOD rapid measuring method and a measuring instrument, belonging to the field of environmental pollution monitoring. The measuring instrument comprises a hybridbiochemical reactor, an aeration system connected therewith, a dissolved oxygen converter and a computer data processing system, wherein, a dissolved oxygen electrode and an aeration pipe are arrangedin the hybrid biochemical reactor. Sewage and immobilized microorganism particles to be measured are mixed, stirred and aerated in a measuring chamber, heating and temperature control are carried out, thereby leading the immobilized microorganism particles to degrade biodegradable organic pollutants in a water body, constantly reducing the concentration of dissolved oxygen and then calculating the BOD value of a water sample to be measured through a standard curve according to the difference value of the dissolved oxygen between two stable states. The measuring instrument solves the problemsof instability, poor reproducibility of the measurement result and the like of the traditional biological membrane type BOD rapid measuring instrument. The reactor type BOD rapid measuring instrumenthas the advantages of good stability, wide linear range of measurement, good reproducibility, low requirement on precision of a dissolved oxygen instrument and the like.

A method for prolonging the campaign life of a combined blown converter by adopting a metal slag syntactic mushroom head belongs to the technique field of oxygen converter steelmaking. A circular seam type bottom blowing air-supplying element is adopted to replace a capillary permeable brick, thus allowing airflow to concentrate and raising the cooling power on the tip of a nozzle. After well-developed metal mushroom head is formed at the initial campaign stage of smelting process, slag splashing process is carried out immediately to form a slag mushroom head on the surface of the metal mushroom head. After the initial formation of the metal slag syntactic mushroom head, attention is paid on detecting whether the air pressure, P-Q curve of the flow relation, and cold state measurement value have obvious discrepancy; if the discrepancy is larger, the technology is appropriately adjusted to ensure the ventilation property. In the following campaign period, the mushroom head is protected; the mushroom head and hearth height are often detected; the deviation between cold state P-Q curve and the hot sate P-Q curve is detected, thus ensuring that the mushroom head can protect the bottom blowing element effectively in the whole campaign period and having good ventilation property. The method has the advantages of allowing the furnace campaign of the combined blown converter to achieve over 10000 and can reach to 30000 for maximum.

The invention relates to the slagging flux of oxygen converter steelmaking and its preparation methods as well as slagging method. The slagging flux contains by percentage of quality as follow: 5~10% of B2O3, 45~50% of CaO, 20~25% of MgO, 15~20% of Al2O3, 10~15% of Fe2O3. The slagging flux is added for slagging in accordance with the ratio of 2~10kg / ton steel, and the slagging flux is added into the furnace with slagging materials in batches, i.e. it adds the first batch of slagging materials (usually the slagging materials is expected to be half of the total) and prescriptive half of the slagging flux, that is, 1~5kg / t steel, when the gun starts oxygen blowing oxygen. It adds the second batch of slagging materials and the remaining part of the slagging flux at the time of the interim blowing.

Provided is an adding method of steelmaking slag charge of an oxygen converter. Selected raw materials include limestone, lime, light-burned magnesian limestone, ferric-oxide dust pellets and steelmaking iron ore, wherein the limestone contains 53%-55% of CaO, the lime contains 90%-92% of CaO and not more than 2.5% of SiO2, the light-burned magnesian limestone contains 28%-32% of MgO and not more than 2.5% of SiO2, the ferric-oxide dust pellets contain 52%-56% of T and Fe, and the steelmaking iron ore contains 61%-63% of T and Fe. The slag charge comprises, by weight, 12%-14% of the limestone, 28%-30% of the lime, 26%-28% of the light-burned magnesian limestone, 14%-16% of the ferric-oxide dust pellets and 15%-17% of the iron ore, and the raw materials of the slag charge are added in batches. Through batch adding of the optimized lime, the optimized dolomite and the other slag charge, the adding method optimizes the process and end point control of slag, reduces the phenomena of process splashing and smoking, and can obviously reduce smelting costs.

The invention relates to an extremely-thick low-alloy steel plate with a low compression ratio. The steel plate is 150-180 mm thick, and consists of the following components in percentage by mass: 0.10-0.17% of C, 0.15-0.45% of Si, 1.18-1.40% of Mn, less than or equal to 0.010% of P, less than or equal to 0.003% of S, 0.10-0.20% of Ni, 0.010-0.040% of Nb and the balance Fe and inevitable impurities; and meanwhile, the content of the corresponding elements meets the following relation: Ceq less than or equal to 0.39%, [C]+[Mn] greater than or equal to 1.35% but less than or equal to 1.50%. A melting process comprises the following steps: oxygen converter smelting, ladle furnace refining, vacuum degassing treatment, continuous casting for slab with thickness being 370 mm or greater, casting blank cover-cooling, casting blank heating, rolling control, cooling control, stacking and slow-cooling, flaw detection and performance examination. The steel plate has the characteristics of being high in strength, excellent in low-temperature toughness, excellent in weldability and the like, and is wider in scope of application.

The invention relates to high-toughness corrosion-resistant steel. The high-toughness corrosion-resistant steel comprises the following chemical components in percentage by weight: 0.03 to 0.10 percent of C, 0.2 to 0.6 percent of Si, 0.35 to 0.75 percent of Mn, 12 to 14 percent of Cr, 0.5 to 1.5 percent of Ni, 0.01 to 0.04 percent of Al, 0.1 to 0.3 percent of Mo, less than or equal to 0.015 percent of P, less than or equal to 0.006 percent of S and less than or equal to 0.01 percent of N, wherein the Al/N is greater than 2, and the balance is Fe and unavoidable impurities. The manufacturing method of the high-toughness corrosion-resistant steel comprises the following steps of: smelting the chemical components by refining in and out of an electric arc furnace and performing vacuum refining treatment, or refining in and out of an oxygen converter and performing vacuum refining treatment or adopting an electroslag remelting method, and casting into ingots; making hot ingots enter the furnace before forging, wherein the surface temperature of ingots entering the furnace is less than 600 DEG C, the forging heating temperature is 1,200 to 1,250 DEG C, the finish forging temperature is greater than 1,000 DEG C, the forging ratio is greater than 6, and the grain fineness number at 1/2 of the thickness of the wall of a forged piece is not less than level 6. The high-toughness corrosion-resistant steel obtained by the method has the yield strength of greater than 517 MPa, and the ballistic work at -46 DEG C is greater than 27 J; and the high-toughness corrosion-resistant steel is suitable for FF-grade 105 MPa production tree body in oil and gas industry.

Sub-lance carriage fall arrest mechanism relates to an oxygen supply equipment on a top-blown oxygen converter. In order to prevent the sub-lance carriage from falling, the invention provides a sub-lance carriage fall arrest mechanism. The sub-lance carriage fall arrest mechanism comprises cable wires which drive a carriage to move up and down on tracks, is characterized in that the sub-lance carriage fall arrest mechanism also comprises a rotary arm, a connecting bar and a locking pawl, wherein the middle part of the rotary arm is hinged on a carriage frame; one end of the rotary arm is hinged with the end of the cable wire, while the other end of the rotary arm is hinged with the end of the connecting bar; the lower part of the rotary arm, connected with the connecting bar, is provided with a spring which can be compressed by rotated the rotary arm; one end of locking pawl is hinged with the carriage frame, while the other end is hinged with the other end of the connecting bar; the end face of the locking pawl connected with the connecting bar can get into contact with the track through the structure. The sub-lance carriage fall arrest mechanism effectively restrains carriage from falling down when cable wires broken and greatly improves the liability of sub-lance work and carriage work, so the sub-lance carriage fall arrest mechanism is propitious to spread and exploitation.

A method for the regeneration of a metal slag syntactic mushroom head and shimming a hearth with ventilation property belongs to the technique field of oxygen converter steelmaking. In the case that melting loss of hearth is caused by using a converter for smelting mild steel and the melting loss occurs correspondingly at the metal slag syntactic mushroom head, the metal slag syntactic mushroom head is regenerated and the shimming hearth with ventilation property is ensured. In the whole furnace campaign period, the sunken amount is seriously controlled to be less than or equal to 200mm according to the hearth thickness. The operation of hearth shimming comprises the following three stages: hearth cleaning, metal mushroom head regeneration and sintering hearth shimming. The invention provides a technique method for the regeneration of metal slag syntactic mushroom head and shimming the hearth with ventilation property in the case that the hearth is eroded when using a top and bottom combined blowing converter, and the technique method is used for protecting bottom blowing elements and raising the campaign of the top and bottom combined blowing converter. The sintered layer on hearth with good ventilation property is formed and finally the metal slag syntactic mushroom head with good ventilation property is reformed through adjusting the granularity ratio of repairing mass and adopting reasonable sintering technology.

The invention provides a control method for improving gas recovery of a new OG (Oxygen Converter Gas Recovery) converter. The control method comprises the following steps: 1) feeding back a pressure signal of micro differential pressure of a converter mouth, a position signal of an annular gap scrubbing tower and rotation speed of a dust exhausting fan to a PLC (Programmable Logic Controller); 2) detecting the content of gas and the content of CO through a gas analyzing instrument, and igniting and diffusing the gas in a diffusing tower when the contents do not meet the recovery condition; 3) adjusting the micro differential pressure of the converter mouth by self-optimizing model switch control; and 4) starting to recover the gas when the gas analyzing instrument detects that the gas meets the requirement on collection. According to the control method for improving gas recovery of the new OG converter, a movable smoke hood, an annular gap hydraulic control device and the dust exhausting fan are coordinated and controlled by the PLC, the self-optimizing switching control mode is adopted, so that the micro differential pressure of the converter mouth in blowing can quickly reach the range of 0 to 10Pa and the stable state during blowing, and as a result, the content of the gas and the content of CO in of the converter can meet the requirement on collection within a short time, and the purpose of improving the recovery rate of the gas of the converter can be realized.

The invention discloses a circular seam control device and process for a novel converter one-time dedusting OG (Oxygen Converter Gas Recovery) system. The circular seam control process comprises the following steps of: accessing a position feedback signal of the circular seam control device to a PLC (Programmable Logic Controller) and accessing a signal output from the PLC to a servo valve; in a blowing intermission, concentratedly manually operating a circular seam cone and a smoke hood and manually setting openness; in the initial blowing stage, enabling a three-way valve to be at a diffusion side, igniting and discharging coal gas of a converter, keeping the position of the smoke hood fixed, and enabling the circular seam control device to be in an concentrated and automatic state of the servo valve; in the intermediate blowing stage, enabling the three-way valve to be at a recovery side, roughly adjusting the height and the micro-differential pressure of the smoke hood, reducing the fluctuation of the micro-differential pressure, and setting the circular seam control device to be in a concentrated and automatic state of the serve valve. The circular seam control device comprises the circular seam cone, a hydraulic station and the PLC. The smoke hood is used for matching control over the circular seam control device; the hydraulic station is used for supplying power; the PLC is used for transmitting the signal to the servo valve and controlling the servo valve to actuate; the servo valve is used for driving and controlling the circular seam cone; and an absolute encoderis additionally arranged on the smoke hood. The circular seal control device and process disclosed by the invention have the advantages of reduced number of installation equipment, increase of energyrecovery, low investment and high system precision.

The invention discloses a bainite steel frog, comprising 0.18-0.23 wt% of C, 1.0-2.0 wt% of Mn, 0.4-0.7 wt% of Al, 0.6-1.0 wt% of Ni, 1.4-2.0 wt% of Cr, 1.0-1.6 wt% of Si, less than 0.01 wt% of Ti, less than 0.0005 wt% of B, less than 0.03 wt% of V, less than 0.01 wt% of Nb, less than 0.0016 wt% of O, less than 0.0001 wt% of H, less than 0.01 wt% of S, and less than 0.01wt% of P, and the balance of Fe A method for manufacturing the bainite steel frog comprises the following steps: smelting in an oxygen converter; then conducting external refining; and then forming sectional form by continuous casting and hot rolling to obtain a railway frog blank material, wherein the rolling ratio is larger than 9; after rolling, directly conducting three-stage cooling to room temperature; and finally heating up to 310-330 DEG C, preserving the heat for 50-70min, and then conducting air cooling to room temperature. According to the invention, the advantages of simple process, low cost, energy saving performance and material saving performance are achieved, and the bainite steel frog has excellent welding performance.

The invention relates to an 8-25mm thickness type low-yield-ratio and high-strength steel sheet for a tank truck. The 8-25mm thickness type low-yield-ratio and high-strength steel sheet for the tank truck solves the shortages such as high yield ratio, low welding performance and high production cost of a current steel sheet. The 8-25mm thickness type low-yield-ratio and high-strength steel sheet for the tank truck is characterized in that a C+Mn+Cr and Nb and Ni microalloying system is adopted; the steel comprises the following chemical components in percentage by weight: 0.08-0.15% of C, 0.05-0.20% of Si, 1.50-2.00% of Mn, not greater than 0.012% of P, not greater than 0.005% of S, 0.32-0.45% of Cr, 0.10-0.20% of Ni, 0.02-0.07% of Nb, and the balance Fe and inevitable impurity elements; and the formula (seeing the description) is met. A normalizing technology is carried out for production; the mechanical performance meets the condition that the yield strength is not less than 400MPa;the tensile strength Rm is not less than 600MPa; the ductility A50 is not less than 32%; the yield ratio is not greater than 0.75; the transverse impact energy KV2 at below 50 DEG C is not less than 47J; the technical processes include preparing molten iron through a blast furnace, performing KR treatment on the molten iron, performing smelting in a 120-160t oxygen converter, performing refining in an LF (ladle furnace), performing treatment (refining) in an RH vacuum furnace, performing continuous casting, heating a casting blank, performing controlled rolling, performing normalizing, detecting cracks, and inspecting. The 8-25mm thickness type low-yield-ratio and high-strength steel sheet for the tank truck has the characteristics of being low in yield ratio, high in strength, outstandingin low-temperature toughness and plasticity, and high in welding performance; and in addition, the production cost is low; and the operability is high.

The invention provides a method for smelting low-aluminium moulded steel, and relates to iron and steel smelting methods. The problem of component pattern breaking in existing low-aluminium moulded steel is solved. The method comprises the steps that molten iron after blast furnace ironmaking is subjected to pretreatment, wherein desulfuration is conducted mainly; the molten iron which is subjected to pretreatment enters a converter to be smelted, oxygen converter blowing is adopted, decarbonization, desulfuration, dephosphorization and desilicication are conducted in the blowing process, oxygen dissolved in the molten iron is removed in the later period of blowing, the process of steel tapping and alloying is conducted after blowing is completed, alloy is added according to steel grade demands, and low-aluminium moulded steel liquid is formed; the molten iron which is smelted by the converter enters a refining furnace to be subjected to the refining process of out of the converter, and a steel grade with the needed components is formed. The method can be widely applied to the smelting of the steel grade, in which temperature rising by blowing oxygen cannot be conducted in refining, and a low limit requirement for aluminium is asked, and the method is particularly applied to moulded steel with a low-aluminium requirement. According to the method, the components of the low-aluminium moulded steel are stably controlled, the problem of component pattern breaking in the low-aluminium moulded steel smelting process is solved, and component steel changing is avoided.

The invention discloses a 42Mn wide steel stripe for a knife die and a manufacturing method of the wide steel stripe. The wide steel stripe comprises the chemical components by weight percent: 0.39%-0.46% of C, 0.80%-0.95% of Mn, 0.18%-0.35% of Si, 0.10-0.30% of Cr, 0.010%-0.050% of Ti, less than or equal to 0.020% of P, less than or equal to 0.010% of S, 0.010%-0.050% of Alt, and the balance of Fe and inevitable impurity elements. The manufacturing method comprises the processes of: a steelmaking process: smelting by adopting a top-bottom combined blowing oxygen converter, refining molten steel by an LF (ladle furnace); and conveying the molten steel to a continuous casting workshop to carry out continuous casting to form a plate blank; a heating process: heating the plate blank to be at 1190-1250 DEG C, and controlling the total heating time according to 0.7-1.0min/mm; and a rolling process: controlling and rolling the heated plate blank by using a hot rolling mill, and coiling to form the steel strip, wherein the hot continuous rolling finishing temperature range is within 850-920 DEG C, and the coiling temperature range is within 640-720 DEG C. The 42Mn brand wide strip produced by using the method replaces a 30CrMo brand narrow steel strip to be supplied to a knife die factory for manufacturing the knife die, and the demands of the knife die manufacturing industry on purchase cost, width, precision, performance and surface quality of the steel strip are met.

The production process of compositely reinforced steel includes the steps of smelting, tapping, deoxygenating and alloying, blowing argon, continuous casting, finishing, heating, rolling, cooling, etc. The production process features smelting in oxygen converter with final carbon content controlled in 0.08-0.12 %, controlling the chemical components of the steel product, deoxygenating and alloying via adding SiMnFe, MnFe, SiFe, SiAlCaBa and NbFe, bottom blowing argon in the ladle, continuous casting at 1020-1060 deg.c, and rolling in the austenite re-crystallization region. The steel bar product of the present invention has high toughness, good weldability, good earthquake resistant performance, high strength, low cost and high comprehensive performance.

The invention discloses an AOD+VOD duplex smelting process and device for low-carbon ferrochrome. The device comprises a movable AOD argon-oxygen converter with a top oxygen lance, wherein a bottom (side) oxygen lance is arranged at the bottom of the argon-oxygen converter, the top oxygen lance, a gas collecting hood and a feeding device are arranged above the argon-oxygen converter, a vacuum hoodis arranged above a VOD vacuum station, the vacuum hood is connected with a vacuumizing device, and a feeding device is arranged at the upper end of a furnace opening. A process of AOD+VOD duplex smelting of low-carbon ferrochrome comprises a molten ferrochrome preparation process, a rapid decarburization AOD refining process, a cooling process by adding a cooling material, a vacuum negative pressure bottom oxygen decarburization VOD refining process, a vacuum negative pressure carbon deoxidation refining process, a reduction refining process and a detection and warehousing process. Accordingto the process provided by the invention, a new process of hot charging of molten ferrochrome is adopted, and oxygen, nitrogen or argon, and a mixed gas of nitrogen and oxygen or argon and oxygen areblown in through special refining equipment to directly smelt low-carbon ferrochrome; and the process has the advantages of short smelting period, no power consumption, good product quality, less impurities, energy conservation, environmental protection and the like.

The invention relates to full-automatic converter steelmaking, and particularly relates to a converter and finery steelmaking continuous detection system. The system comprises an oxygen lance, a light transmission lens and an optical fiber and further comprises a spectrometer and a computer, wherein the oxygen lance is provided with the light transmission lens; the light transmission lens is connected with one end of the optical fiber through an optical coupler; the other end of the optical fiber is connected with a light inlet of an external spectrometer through the optical coupler; a photoelectric conversion signal of the spectrometer is connected with a signal input port of the computer through an output end; and a signal output port of the computer is connected with a converter automatic control system. According to the invention, a means of detecting internal reaction conditions on line is provided; and based on the detection data, the continuous measurement of oxygen converter steelmaking and the full-automatic control on converting process can be realized through spectral analysis instead of sublance and flue gas analysis.

The invention discloses a manganese-molybdenum-vanadium steel material for a high-strength bolt. The manganese-molybdenum-vanadium steel material comprises the following chemical element components of, by mass percent,0.39-0.46% of carbon, 0.15-0.30% of silicon, 1.45-1.60% of manganese, less than or equal to 0.015% of phosphorus, less than or equal to 0.015% of sulfur, 0.35-0.45% of molybdenum, less than or equal to 0.25% of nickel, less than or equal to 0.25% of copper, 0.04-0.10% of titanium, 0.0005-0.0025% of boron, 0.15-0.30% of vanadium, 0.05-0.10% of niobium, 0.03-0.08% of aluminum and the balance iron. The manganese-molybdenum-vanadium steel material has good machinability and hardenability, various elements act synergistically, and the strength and toughness of steel can be improved effectively. The invention also discloses a preparation method of the manganese-molybdenum-vanadium steel material. By adopting top-blown oxygen converter smelting and furnace external refining, with a continuous casting technology, the chemical components of the manganese-molybdenum-vanadium steel material can be controlled within the ranges of design.

A suspension device (8) for a converter, comprising a central structure (8′), adapted to be fixed to a container (2) of the converter (1), a first lateral structure (29), arranged at a first side of the central structure and adapted to be fixed to a first surface (10, 11) of a supporting ring (3) of the container, a second lateral structure (28), arranged at a second side of said central structure and adapted to be fixed to the surface (10, 11), wherein two wedge-shaped elements (15, 15′) are provided, each element being provided between the central structure and a respective lateral structure and configured so as to slide on sliding surfaces (23, 24, 24′) connected respectively to the central structure and to the respective lateral structure, wherein each wedge-shaped element is crossed by at least one tie-rod (16, 16′) connected thereto, and wherein elastic means (17) are provided, which are associated to or intrinsic with said one tie-rod and configured to maintain a wedging of the wedge-shaped element.

The invention discloses an automatic temperature control system for top blowing oxygen converter steel-making and a use method of the automatic temperature control system. The automatic temperature control system for top blowing oxygen converter steel-making comprises an optical receiving system, a double-color cross light path, a photoelectric conversion unit, an A/D analog to digital conversion unit, an information processing unit and an automatic control system, wherein a temperature measuring window is formed in the position between an oxygen blowing conduit and a waste gas collecting conduit on the top of a top blowing oxygen converter; the automatic temperature control system is positioned right above the temperature measuring window. The automatic temperature control system is high in temperature control precision and wide in temperature control range, can automatically control the temperature in an in-situ severe steel-making environment, can avoid operation accident and is worthy of popularization.

The invention relates to the technical field of steel metallurgy, in particular to an oxygen converter high-pressure injection limestone powder slagging and dephosphorization method. According to thescheme, the method comprises the following steps that S1, the following raw materials of, by weight, 20-80 parts of iron raw material (iron powder, pig iron and ladles) and 2-8 parts of limestone powder are prepared; S2, the iron raw materials are placed in a molten iron container, molten iron is formed, and the temperature of the molten iron is controlled to be 1350 DEG C to 1500 DEG C; S3, the 2-8 parts of limestone powder is injected into the molten iron through an oxygen lance with carrier gas as a carrier, and the injection time is 0.5 min to 30 min; and S4, a finished product is subjected to temperature measurement and sampling analysis. Through the decomposition characteristics of limestone and advantages of injection metallurgy, products formed by decomposition after the limestoneis rapidly heated are effectively utilized, CaO participates in the slagging and dephosphorization process, CO2 and C, Si, Mn and other elements in the molten iron react, generate CO and can be continuously used, and thus the method has the advantages of low investment cost and high efficiency.