[vc_row][vc_column][vc_tta_pageable][vc_tta_section title=”page 1″ tab_id=”1613712511168-94098b62-6452″][vc_toggle title=”The principle of adjusting and controlling the gun position in the early stage of blowing is:”]The slag is melted early, and the slag is melted well in order to maximize the removal of (phosphorus).[/vc_toggle][vc_toggle title=”The oxygen transfer methods in the oxygen top-blown converter generally include:”]There are two ways of (direct oxygen transmission) and indirect oxygen transmission.[/vc_toggle][vc_toggle title=”Steelmaking temperature control refers to”]Correctly control the temperature and (end point) temperature of a furnace of steel.[/vc_toggle][vc_toggle title=”The root cause of slag drying back is”]The carbon-oxygen reaction is fierce, and the slag (FeO) is greatly reduced.[/vc_toggle][vc_toggle title=”Which three layers of concentric steel pipes consist of the oxygen lance”]The inner pipe is the (oxygen) channel, the cooling water (inlet) channel between the inner tube and the middle tube, and the cooling water (outlet) channel between the middle tube and the outer tube.[/vc_toggle][vc_toggle title=”The main reasons for the damage of the lining are”]The role of high temperature heat flow, the role of (quick cold and rapid heat), the role of (mechanical shock), chemical erosion and other aspects.[/vc_toggle][vc_toggle title=”The main purpose of lowering the lance at the end of converter smelting is”]uniform molten steel temperature and (composition).[/vc_toggle][vc_toggle title=”Methods to control the carbon content of molten steel at the end point are”]There are three kinds of carbon drawing method, high drawing filling method and (carbon increasing method).[/vc_toggle][vc_toggle title=”The automatic control of the oxygen top-blown converter steelmaking process is divided into”](Static control) and dynamic control.[/vc_toggle][vc_toggle title=”Mach number is”]The ratio of the air velocity to the (speed of sound) under local temperature conditions.[/vc_toggle][/vc_tta_section][vc_tta_section title=”page 2″ tab_id=”1613712511179-28ebaecd-fb99″][vc_toggle title=”What is a reasonable nozzle structure”]A reasonable nozzle structure should maximize the conversion of the oxygen stream (pressure energy) into kinetic energy.[/vc_toggle][vc_toggle title=”In order to achieve the purpose of balanced erosion of the furnace lining and prolong the furnace life, use”](Comprehensive furnace building).[/vc_toggle][vc_toggle title=”The main role of the secondary gun is”](Temperature measurement), (Sampling), (Carbon determination), (Oxygen determination), (Measuring liquid level), it brings the advantages of reducing labor intensity, shortening smelting time, and easy to realize automatic control.[/vc_toggle][vc_toggle title=”The main factors affecting the refractoriness of the converter final slag are”](MgO), TFe and alkalinity (CaO/SiO2).[/vc_toggle][vc_toggle title=”Oxygen flow refers to”]The amount of oxygen supplied to the molten pool per unit time (volume).[/vc_toggle][vc_toggle title=”What is the effect of excessively high molten steel temperature?”]If the temperature of molten steel is too high, the (solubility) of the gas in the steel will be too large, and the greater the impact on the steel.[/vc_toggle][vc_toggle title=”Refractories with (CaO) and (MgO) as the main components are”]Alkaline refractories.[/vc_toggle][vc_toggle title=”In the slag splash protection process, in order to make the slag splash layer have sufficient refractoriness, the main measure is to adjust”]The content of (MgO) in the slag.[/vc_toggle][vc_toggle title=”The main contents of the oxygen supply system include:”]Determine the reasonable (nozzle structure), (oxygen supply intensity), (oxygen pressure) and (gun position control).[/vc_toggle][vc_toggle title=”The slagging system is determined to be appropriate”](Method of slagging); type of slag; quantity of slag; adding time and measures to accelerate slagging.[/vc_toggle][/vc_tta_section][vc_tta_section title=”page 3″ tab_id=”1613712513759-7edae8fe-9741″][vc_toggle title=”The deoxidizing ability of deoxidizing elements refers to”]At a certain temperature, it is the concentration of oxygen in molten steel (equilibrium state) with a certain concentration of deoxidizing elements.[/vc_toggle][vc_toggle title=”What is the effect of adding alloy to molten steel?”]The freezing point of molten steel is (decreased).[/vc_toggle][vc_toggle title=”The blowing mode with low blowing gun position or high oxygen pressure is called”](Hard blow).[/vc_toggle][vc_toggle title=”What is the composition of the oxygen lance?”](Nozzle), gun body, gun tail.[/vc_toggle][vc_toggle title=”The oxygen supply per ton of metal per unit time is called”](Oxygen supply intensity), its common unit is (standard m3/ton.min).[/vc_toggle][vc_toggle title=”The performance requirements for refractory materials in converter production are:”]Refractoriness (high), resistance to sudden temperature changes, strong resistance to slag and molten steel corrosion, stable high temperature performance and chemical performance.[/vc_toggle][vc_toggle title=”Features of converter flue gas:”](high temperature), (large gas volume), (large dust content), the gas has (toxic) and (explosive).[/vc_toggle][vc_toggle title=”The current treatment methods for converter flue gas are”](burning method) and (unburning method) two kinds.[/vc_toggle][vc_toggle title=”The average amount of flue gas per ton of steel in the unburned method (standard state) is”](60-80m3/t), the flue gas volume of the combustion method is (4-6) times that of the unburned method.[/vc_toggle][vc_toggle title=”The converter flue gas purification system can be summarized as”]There are three parts of flue gas (collection and transmission), (cooling and purification), (extraction and release).[/vc_toggle][/vc_tta_section][vc_tta_section title=”page 4″ tab_id=”1613712515023-7c5d0bb5-7b74″][vc_toggle title=”The converter flue gas purification methods are”](full wet method), (dry and wet combined method) and (full dry method) three forms.[/vc_toggle][vc_toggle title=”What are the three parts of the venturi purifier?”](Atomizer), (Venturi tube body) and (Dehydrator) composed of three parts.[/vc_toggle][vc_toggle title=”What are the three parts of the venturi body?”](Contraction section), (throat section), (expansion section) are composed of three parts.[/vc_toggle][vc_toggle title=”Venturi tubes can be divided into structures”](Sizing Venturi) and (Adjusting Venturi).[/vc_toggle][vc_toggle title=”Which three main systems are included in the converter gas recovery process?”]There are three main systems (converter gas cooling system), (converter gas purification system), and (converter gas recovery system).[/vc_toggle][vc_toggle title=”Under normal circumstances, when is dephosphorization mainly carried out?”]Smelting (preliminary) is carried out.[/vc_toggle][vc_toggle title=”The main purpose of bale protection pouring is:”]To avoid (secondary oxidation).[/vc_toggle][vc_toggle title=”The operation of adding one or several alloying elements to steel to meet the requirements of finished steel composition is called”](Alloying).[/vc_toggle][vc_toggle title=”What is the root cause of splashing during steelmaking?”]The explosive carbon-oxygen reaction in the steel-making molten pool and the instantaneous generation of large amounts of (CO) gas is the root cause of the splash.[/vc_toggle][vc_toggle title=”Oxygen top-blown converter steelmaking decarburization mainly depends on”](oxygen supply strength) and bath temperature.[/vc_toggle][/vc_tta_section][vc_tta_section title=”page 5″ tab_id=”1613712516195-f227420d-1bbd”][vc_toggle title=”The thermodynamic conditions for dephosphorization are”]High alkalinity, (high iron oxide) and moderately low temperature.[/vc_toggle][vc_toggle title=”Adding Al to killed steel is to”]Ensure complete deoxidation and refinement (grain).[/vc_toggle][vc_toggle title=”The cause of splashing is”]An explosive (carbon-oxygen) reaction is produced and carbon monoxide gas emission is blocked.[/vc_toggle][vc_toggle title=”The current methods of flue gas purification are”](combustion method) and unburnt method.[/vc_toggle][vc_toggle title=”The presence of sulfur in steel can improve the”](cutting) performance.[/vc_toggle][vc_toggle title=”For high-quality carbon steel, the phosphorus content is required to be controlled within”](0.035%)% or less.[/vc_toggle][vc_toggle title=”The main difference between rimmed steel and killed steel is”](The degree of deoxygenation is different).[/vc_toggle][vc_toggle title=”Industrial “three wastes“ means”]Waste water, waste gas, (waste residue).[/vc_toggle][vc_toggle title=”What are the characteristics of active lime:”](High porosity, large specific surface, fine crystal grains) and other characteristics, so it is easy to melt, and the slag formation speed is fast.[/vc_toggle][vc_toggle title=”Three off in the pretreatment of molten iron refers to”](Desiliconization, Dephosphorization, Desulfurization).[/vc_toggle][/vc_tta_section][vc_tta_section title=”page 6″ tab_id=”1613712591066-9a13956c-7f93″][vc_toggle title=”The air supply components at the bottom of the compound blowing can be divided into”](tube type) and (breathable brick type) two types.[/vc_toggle][vc_toggle title=”The relationship between the (melting point) and (composition) of the slag is shown graphically. This kind of graph is called”]The phase diagram of the slag.[/vc_toggle][vc_toggle title=”(Mold) is called”]The heart of the continuous casting machine.[/vc_toggle][vc_toggle title=”In order to provide qualified molten steel for continuous casting, what must steelmaking be strictly controlled?”]Strictly control the composition of molten steel, especially the (sulfur), (phosphorus) and (gas and non-metallic inclusions) in steel must be controlled to the lowest level possible to improve the cleanliness of molten steel.[/vc_toggle][vc_toggle title=”The main internal defects of continuous casting slab are:”](center looseness, shrinkage cavity, center crack, middle crack, subcutaneous crack, subcutaneous bubble, center segregation, slag inclusion) etc.[/vc_toggle][vc_toggle title=”The main measures to improve the purity of continuous casting molten steel are:”]Steelmaking (providing pure molten steel), using molten steel (refining treatment outside the furnace) and (continuous casting protection casting)[/vc_toggle][vc_toggle title=”The internal structure of the continuous casting billet of killed steel can be divided into”](surface equiaxed crystal) belt, (columnar crystal) belt and (central equiaxed crystal) belt.[/vc_toggle][vc_toggle title=”Industrial steel is generally divided into chemical composition”](carbon steel) and (alloy steel) are two major categories.[/vc_toggle][vc_toggle title=”Main sources of non-metallic inclusions in steel:”]Raw materials, slag, furnace lining, cast refractory, (deoxidation product), (secondary oxidation) in the production process.[/vc_toggle][vc_toggle title=”The main functions of refining outside the furnace are:”]Adjust (temperature, composition) to remove (inclusions and gas) in steel.[/vc_toggle][/vc_tta_section][vc_tta_section title=”page 7″ tab_id=”1613712592267-159533fe-991a”][vc_toggle title=”The structure of the gas supply element at the bottom of the combined blowing converter has”](Casing nozzle type), brick joint combination type, (thin metal tube porous type), etc.[/vc_toggle][vc_toggle title=”Commonly used desulfurizers for desulfurization outside molten iron furnace are:”]Lime, (calcium carbide), (magnesium granules).[/vc_toggle][vc_toggle title=”The thermal effects of coolant include:”](the physical heat consumed by the coolant to increase the temperature) and (the chemical heat consumed by the coolant to participate in the chemical reaction).[/vc_toggle][vc_toggle title=”The commonly used deoxidation methods for steelmaking are:”](precipitation deoxidation method), diffusion deoxidation method, (vacuum deoxidation method).[/vc_toggle][vc_toggle title=”When the combined force of `{`H`}` in the small pores and microstructure stress exceeds the strength of the steel, what will happen during rolling?”](white dot).[/vc_toggle][vc_toggle title=”The desulfurization methods of converter steelmaking are”](Slag Desulfurization) and (Vaporization Desulfurization).[/vc_toggle][vc_toggle title=”The commonly used deoxidation methods for steelmaking are”](precipitation deoxidation), (diffusion deoxidation), and (comprehensive deoxidation).[/vc_toggle][vc_toggle title=”The reaction of `{`Mn`}`+`{`O`}`=( MnO) is”](exothermic) reaction.[/vc_toggle][vc_toggle title=”The use of light reduction technology is mainly”]Improve the (center segregation) of the slab.[/vc_toggle][vc_toggle title=”When the length of the two diagonals on the cross section of the billet is not equal, it is called”](off party).[/vc_toggle][/vc_tta_section][vc_tta_section title=”page 8″ tab_id=”1613712593312-c86dd915-88d2″][vc_toggle title=”Longitudinal cracks belong to”](surface) defects.[/vc_toggle][vc_toggle title=”Requirement for tilting angle of converter body”]It can rotate (360) degrees in both directions.[/vc_toggle][vc_toggle title=”When the temperature of the molten pool is low during the smelting process, it can be used”](Ferrosilicon), aluminum block temperature increase.[/vc_toggle][vc_toggle title=”The five major systems of converter steelmaking are”](loading) system, (slagging) system, (temperature) system, oxygen supply system, endpoint control and deoxidation alloying.[/vc_toggle][vc_toggle title=”Common gases in steel are,”](oxygen), (nitrogen), and (hydrogen)[/vc_toggle][vc_toggle title=”Segregation in slab refers to”]The distribution of billet (chemical composition) and (gas and inclusions) is not uniform, but usually refers to the uneven distribution of (chemical composition).[/vc_toggle][vc_toggle title=”In what form does carbon mainly exist in steel?”]It exists in steel in the form of (Fe3C) and is the main element that determines steel (strength).[/vc_toggle][vc_toggle title=”The splash produced in converter steelmaking can be divided into”](Explosive splash), (Foam slag splash), (Return to dry metal splash).[/vc_toggle][vc_toggle title=”During the blowing process, the principle of controlling the process temperature is”]During the blowing process, the principle of controlling the process temperature is[/vc_toggle][vc_toggle title=”According to the different degree of deoxidation, steel can be divided into”](killed steel), (semi-killed steel) and (rimmed steel).[/vc_toggle][/vc_tta_section][vc_tta_section title=”page 9″ tab_id=”1614047659929-53dc0b03-0b4f”][vc_toggle title=”The technical standards of products can be divided into”](National Standard), (Industry Standard), Enterprise Standard, etc.[/vc_toggle][vc_toggle title=”Phosphorus in molten steel is a harmful element, what can it make steel”](cold and crisp).[/vc_toggle][vc_toggle title=”Sulfur in molten steel is a harmful element, what can it make steel”](hot and crisp).[/vc_toggle][vc_toggle title=”The melting loss mechanism of the bottom air supply element is mainly”](bubble counterattack), (water hammer erosion) and (pit melt loss).[/vc_toggle][vc_toggle title=”Part of the metal is lost during the converter steelmaking process. This part of the metal lost during the (conversion) process is called”]Blow loss.[/vc_toggle][vc_toggle title=”(Bottom air supply element) is the core of combined blowing technology,”](Nozzle type) and (brick type).[/vc_toggle][vc_toggle title=”The main factors affecting the fluidity of molten steel are”](temperature), (composition) and (inclusions in steel).[/vc_toggle][vc_toggle title=”The oxygen transfer carrier of the oxygen top blowing converter is”](Metal droplet transfers oxygen), (Emulsion transfers oxygen), (Slag transfers oxygen) and (Iron ore transfers oxygen).[/vc_toggle][vc_toggle title=”The main forms of converter steelmaking desulfurization are”](Slag desulfurization), gasification desulfurization, and out-of-furnace desulfurization.[/vc_toggle][vc_toggle title=”The main factors affecting slag viscosity are”]Temperature, solid particles in the slag, (slag composition).[/vc_toggle][/vc_tta_section][vc_tta_section title=”page 10″ tab_id=”1613712595486-eb730da4-a171″][vc_toggle title=”The main factors affecting slag viscosity are”]Temperature, solid particles in the slag, (slag composition).[/vc_toggle][vc_toggle title=”The oxidation reaction of silicon is”](exothermic) reaction, low temperature is conducive to the oxidation of silicon.[/vc_toggle][vc_toggle title=”Commonly used deoxygenation methods are”]There are three types: precipitation deoxidation, diffusion deoxidation, and (vacuum deoxidation).[/vc_toggle][vc_toggle title=”When the oxide decomposition reaction reaches equilibrium, the pressure of the generated gas is called”](decomposition pressure).[/vc_toggle][vc_toggle title=”In Q235A, A means”]Steel (quality grade).[/vc_toggle][vc_toggle title=”Substances that can significantly reduce the surface tension of liquids are called”](Surface active substance).[/vc_toggle][vc_toggle title=”The main raw materials for top and bottom combined blowing converter steelmaking are”]Hot metal and (scrap steel).[/vc_toggle][vc_toggle title=”According to the Fe-C phase diagram, the ferroalloy with carbon content (0.0218%～2.11%) is”]Steel.[/vc_toggle][vc_toggle title=”The nozzles of the converter oxygen lance are mostly”](Laval) type porous nozzle.[/vc_toggle][vc_toggle title=”Commonly used industrial steelmaking methods are”](converter steelmaking method), electric arc furnace steelmaking method, open hearth steelmaking method.[/vc_toggle][/vc_tta_section][vc_tta_section title=”page 11″ tab_id=”1614047941243-6741bd9e-b481″][vc_toggle title=”The loading system of the converter is”]Quantitative loading, (fixed depth loading), (quantitative loading in stages).[/vc_toggle][vc_toggle title=”The heat released during the transformation of steel from liquid to solid and subsequent cooling includes”](Overheating of molten steel), (Latent heat of crystallization) and (Sensible heat of ingot (slab)).[/vc_toggle][vc_toggle title=”The characteristics of the secondary oxide of molten steel are”](complex composition), (large particle size), (irregular shape), accidental distribution.[/vc_toggle][vc_toggle title=”The main cause of segregation”](Difference in solubility of elements in liquid and solid state), (cooling rate), (diffusion rate), (convective flow of liquid phase).[/vc_toggle][vc_toggle title=”Under what atmosphere is the hot metal dephosphorization reaction in hot metal pretreatment?”](oxidizing) in an atmosphere.[/vc_toggle][vc_toggle title=”Inclusions in steel can be divided into”]Do not deform inclusions, (brittle inclusions), (plastic inclusions).[/vc_toggle][vc_toggle title=”The factors affecting the alloy yield are:”]tapping temperature, (oxygen content in molten steel), tapping port situation, amount of slag entering the ladle, alloy particle size, alloy input sequence.[/vc_toggle][vc_toggle title=”The stirring of the converter bath is conducive to improving the kinetic conditions of smelting, and its sources are mainly”](C-O reaction) A large number of CO bubbles are generated to stir the molten pool during the floating process, and the other is (the stirring of the external gas blowing).[/vc_toggle][vc_toggle title=”The slag can be divided into:”]Oxidation slag and (reduction slag).[/vc_toggle][vc_toggle title=”The actual oxygen content of the converter molten steel is always (greater than) the oxygen content in equilibrium with the carbon, and the difference is called”]The oxidation of molten steel.[/vc_toggle][/vc_tta_section][vc_tta_section title=”page 12″ tab_id=”1614047940993-e9972e74-09ed”][vc_toggle title=”Inclusion means”]The (non-metallic) phase produced or mixed into molten steel during smelting and pouring solidification.[/vc_toggle][vc_toggle title=”Surface active substances can significantly reduce the liquid”](surface tension).[/vc_toggle][vc_toggle title=”The adsorption of other liquid media on the surface of a solid or liquid is called”](Adsorption).[/vc_toggle][vc_toggle title=”The molecular formula of the low-melting point produced by calcium treatment of aluminum killed molten steel is”](12CaO.7Al2O3).[/vc_toggle][vc_toggle title=”The main components of fluorite are”](CaF2 ).[/vc_toggle][vc_toggle title=”The three vertex angles of the ternary phase diagram represent”](three pure components) and its melting point.[/vc_toggle][vc_toggle title=”What form does phosphorus exist in steel”]([Fe2P], [Fe3P) forms exist.[/vc_toggle][vc_toggle title=”The eutectic transition temperature in the Fe-C phase diagram is”](1148℃).[/vc_toggle][vc_toggle title=”The main indicators of white slag in LF furnace are:”]((FeO)<1.0% and MnO<0.5%).[/vc_toggle][vc_toggle title=”The role of the continuous casting straightening machine is”](drawing), (straightening), sending starter.[/vc_toggle][/vc_tta_section][vc_tta_section title=”Section” tab_id=”1614049433878-43d136bd-bfae”][/vc_tta_section][/vc_tta_pageable][/vc_column][/vc_row]
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