115 results about "Deoxidization" patented technology

The invention belongs to the technical field of steelmaking, and relates to a method for controlling large-size inclusions in silicon-aluminum deoxidized steel. Converter tapping adopts a silicon-aluminum deoxidation process, after tapping, high-oxidability slag is removed by adopting a slagging-off process, and then high-reducibility premelting refining slag is added for re-slagging, so that the slag (TFe + MnO) at most of the refining moments is maintained within 0.50%; in the refining process, the stirring strength is controlled to control the desulfurization rate of the refining slag within 50%, so that the slag entrapment degree of the refining slag is reduced to the maximum extent; two iron sheets with the thickness being 2 mm are placed on the liquid level of the slag in advance before RH vacuum treatment, it is guaranteed that the slag is prevented from being drawn into the dip pipe in the process that the dip pipe is inserted into the molten steel, soft blowing is conducted for 10-15 min after RH vacuum treatment, then argon is closed, and the molten steel is subjected to standing for 20-30 min. By the adoption of the smelting process, the product rejection rate caused by large-size inclusions is reduced to be within 2%.

The invention relates to core-shell structure ceramic powder as well as a preparation method and a preparation system thereof. According to the preparation method, a SiO2 core-containing suspension system is formed under stirring and heating conditions. And dropwise adding a pH regulator into the reaction cavity, guiding a reaction product of the ytterbium source solution and the silicon source solution to deposit and grow on the surface of the SiO2 core to form a core-shell structure precursor, and treating the core-shell structure precursor to obtain the core-shell structure ceramic powder comprising SiO2 (at) Yb2Si2O7. The material of the core of the core-shell structure ceramic powder is SiO2, the material of the shell is Yb2Si2O7, and the SiO2 core is used as a built-in silicon source library, so that the in-situ self-compensation function of the material in a high-temperature environment is realized, the stability of Yb2Si2O7 is ensured, and the problem of irreversible deoxidization decomposition of a Yb2Si2O7 phase can be avoided when the ceramic powder serves in an extreme environment with high temperature, high pressure and high water oxygen partial pressure for a long time.

The utility model discloses a gas purification equipment filter assembly convenient to dismount, relates to gas purification technical field, a gas purification equipment filter assembly convenient to dismount, including fixed bottom plate, the top of fixed bottom plate is installed with deoxidization pretreatment subassembly, the top bolt mounting of fixed bottom plate has the support frame, the top fixedly connected with filter box of support frame, the top bolt mounting of filter box has the top cover, the alternate replacement structure, the alternate replacement structure is located on filter box, and the alternate replacement structure includes replacement frame, two screw rods and two molecular sieve, and the bottom of filter box is provided with sliding slot, through setting alternate replacement structure, including replacement frame, screw rod, rotation limit board and other components, when replacing molecular sieve, only need to rotate screw rod to remove the fixed of replacement frame, and make rubber position plug to separate from the positioning groove through rotating rotation limit board, can slide out replacement frame and carry out the replacement of molecular sieve, and simple and convenient operation greatly shortens the replacement time, and improves work efficiency.

The invention belongs to the field of energy conservation and consumption reduction of a gas boiler heat supply gas turbine power plant. The current gas-fired boiler adopts thermal deoxidization to control water supply and oxygen dissolution, water is supplied to a deaerator from an outlet of a secondary energy saver, the smoke exhaust temperature is about 60 DEG C, and waste heat is not fully utilized. Therefore, a novel pipeline system is constructed, a traditional heat exchange process is subverted, and exhaust smoke waste heat is utilized to the maximum extent through multiple heat exchange. The system comprises two sets of schemes adaptive to different operation states, and the schemes can be flexibly switched. When the gas-fired boiler runs, water supplied from an outlet of the secondary energy saver is led to the double-tube heat exchanger of the pressure regulating station, and returns to the primary energy saver after heat exchange to replace a water bath furnace to heat natural gas, so that the heating effect is guaranteed, gas is saved, and the water temperature of an inlet of the primary energy saver is reduced. When the gas turbine runs, one path of feed water is led to the double-tube heat exchanger from the low-pressure feed water secondary heater, and the feed water returns to the condenser after heat exchange, so that the gas consumption of the water bath furnace in low-temperature climate is saved, and more smoke exhaust waste heat is utilized in other climate. The two modes both can reduce the exhaust gas temperature, and are efficient in utilization, energy-saving, emission-reducing, green and environment-friendly.

The invention discloses a smelting method for reducing inclusions in RH vacuum furnace channel washing water, and belongs to the technical field of smelting. When the LF refining furnace is used for smelting the channel washing water, an aluminum source is not added into the channel washing water, and only heating treatment is carried out; when the RH vacuum furnace starts tank washing treatment, the light treatment mode is started firstly, the treatment mode is switched to the treatment mode after residual oxygen in the vacuum chamber is eliminated, the RH vacuum furnace completes carbon deoxidation tank washing operation, and the inclusions in the RH vacuum furnace channel washing water are reduced. According to the method, inclusions generated by deoxidation of the aluminum product are reduced, the purity of molten steel is improved, DS inclusions are obviously reduced, and meanwhile the risk of continuous casting flocculation flow is reduced; the use of aluminum products is reduced, so that the alloy cost is effectively reduced. The secondary refining period of the LF refining furnace is shortened, the power consumption per ton of steel is reduced, the generation of aluminum oxide inclusions is reduced, and the lime consumption of the LF refining furnace is indirectly reduced.

A method for manufacturing a pearlitic steel rail having high surface hardness, relating to the technical field of iron and steel smelting. The method comprises: feeding molten steel having undergone preliminary smelting into a ladle refining furnace, and adding an alloying element for deoxidization and alloying treatment to obtain refined molten steel, so as to further obtain a continuous casting billet; heating the continuous casting billet to a preset temperature by means of a heating furnace, and feeding the heated continuous casting billet into a rolling mill for multi-pass rolling comprising first-pass rolling and second-pass rolling, wherein during the first-pass rolling, the rolling speed is 5.0-7.5 s-1, and the rolling deformation should be 10-15%; after the first-pass rolling, the original austenite grain size is 85-115 μm; and the number of rolling passes is 9-13, and the total deformation is 85-95%; and gradually reducing the gap between rollers of the rolling mill to obtain steel rail blocks having desired specifications and shapes and performing on-line heat treatment and processing treatment on the steel rail blocks to obtain steel rails.

The present application belongs to the technical field of steel metallurgy, and particularly relates to a clean deoxidization process based on ACD technology. According to the carbon content requirement of the steel grade, carbon powder is added to the liquid surface of the ladle during the converter tapping process to preliminarily deoxidize. After the tapping is completed, the ladle enters the LF refining station to perform re-deoxidization through ladle bottom argon blowing. Three deoxidizations are performed in the late argon blowing stage in cooperation with slag modification, and electrode temperature control is performed in the process. After the deoxidization and slag adjustment are completed, alloying operation is performed. The technology fully utilizes carbon + bottom argon blowing deoxidization, can greatly reduce or cancel the consumption of deoxidizing alloy, reduce the generation amount of inclusions, improve the cleanliness of the molten steel, and has good metallurgical effect.

The application discloses a method for preventing overflow of slag in an impact area of a thread steel tundish, and the method comprises the following steps: automatically reducing the flow of bottom argon blowing at the end of a ladle pouring (remaining molten steel 9%~15%) to reduce the slag body from being involved from the source; adding a gradient composite deoxidizing alloy with specific structure and components when about 30 tons of molten steel is discharged, and the adding amount is accurately matched according to the strength grade (400MPa, 500MPa, 635MPa) of the thread steel and the oxygen content of the ladle slag; and periodically adding a low-aluminum-silicon-barium-calcium alloy in the impact area of the tundish for terminal deoxidization. The application also relates to a gradient composite deoxidizing alloy and a continuous casting production system for realizing the process. By using the application, the overflow of slag in the impact area can be completely eliminated (the overflow rate is reduced to 0%), the quality of the thread steel and the continuous casting efficiency (the number of pouring furnaces is increased to 23) are obviously improved, and the production cost is reduced.

The application belongs to the technical field of nickel alloy manufacturing, and particularly relates to a kind of wear-resistant and corrosion-resistant nickel-based alloy material and a preparation method thereof, the nickel-based alloy material is sintered from Ni-Cr-Mo pre-alloy powder, Co powder, Ta powder, rare earth oxide powder, titanium sponge powder and core-shell structure reinforcing phase, the reinforcing phase adopts the core-shell structure of Ni-Mo coated silicon carbide-graphite, which is used to eliminate heterogeneous interface pores and in-situ anchor effectively to prevent particle peeling, and effectively block the malignant outward diffusion of carbon atoms to protect the intergranular corrosion resistance of alloy matrix, the nickel-based alloy material is purified by in-situ deoxidization, carbide interface is anchored effectively, and the corrosion-resistant hardening of core-shell reinforcing phase, a high-bonding composite reinforcement network is built inside, the problem of intergranular corrosion caused by heterogeneous phase peeling and carbon diffusion is solved, and efficient combination of high metallurgical density, lubrication and corrosion resistance is realized.

The utility model discloses a scorpion anti-oxidation packaging device, which relates to the technical field of packaging, and comprises a tank body, a tank cover hermetically matched with an opening of the tank body, and a plurality of partition plates arranged in the tank body and used for dividing an inner cavity of the tank body into a plurality of independent cavities for storing scorpions; the protruding structure is arranged on the inner side of the tank cover, is provided with a filling cavity and is used for storing deoxidizing filler; the communicating assembly is arranged in the inner cavity of the tank body and used for communicating the filling cavity with gas in each independent cavity in the tank body; the blocking assembly is arranged at the opening of the tank body and used for blocking air leaking into the tank body from the tank cover; wherein the opening end of the tank body is provided with a step surface which is in matched contact with the protruding structure, the tank body is provided with an annular groove at the position of the step surface, the annular groove is formed in the circumferential direction of the tank body, and the blocking assembly is arranged in the annular groove. The method has the effect of improving the quality stability of the scorpions.

The application discloses a smelting method of high-titanium high-sulfur stainless steel, which comprises the following steps: step a, adding scrap steel and / or the same steel return material into an electric furnace according to target component requirements for smelting, wherein the molten steel after smelting contains C: 1%-2%, Si: ≤0.70%, Mn: ≤0.7%, P: ≤0.035%, S: ≤0.050% and Cr: 17%-18%, and the smelting temperature is 1600-1650 DEG C, thereby obtaining A product; step b, tapping the A product into an AOD furnace, sequentially experiencing a pretreatment period, a decarburization period, a pre-reduction period and a reduction period, thereby obtaining B product; step c, transferring the B product to an LF furnace, electrically heating and slagging, then using lime to slag and adjust the slag, sampling and analyzing the molten steel components, and supplementing the components, thereby obtaining C product; and step d, casting the C product, and obtaining the finished product after cooling. The application has the advantages that the molten steel can be stably controlled under the conditions of high-alkalinity slag deoxidization and desulfurization, and the high-titanium high-sulfur components are improved, thereby improving the qualified rate of smelting.

The application relates to the technical field of boiler make-up water deoxidation, in particular to a high-efficiency low-temperature deoxidation system. The system comprises a vacuum deoxidizer and a water ring vacuum pump unit, a low-pressure steam pocket is connected with the vacuum deoxidizer through a pipeline, the vacuum deoxidizer is used for removing oxygen in the to-be-processed make-up water, and the deoxidized make-up water enters the water ring vacuum pump unit through a communicating pipeline; a central control unit is connected with the vacuum deoxidizer through a wireless signal, the central control unit is used for setting working parameters of the vacuum deoxidizer; and a monitoring unit is arranged in the vacuum deoxidizer and used for acquiring running parameters of the vacuum deoxidizer. The vacuum deoxidization realizes deoxidization under the condition of a low-temperature water surface (at 70 DEG C or normal temperature), the self-consumption steam quantity of a boiler room is reduced, the vacuum deoxidization can utilize low-grade waste heat, the water can be heated and softened by a jet heater, the deoxidization can be realized in stages and at a low position, the deoxidization is reliable, and the operation is stable.

The present application belongs to the technical field of steel smelting, and relates to a method for controlling nitrogen content of a titanium-containing steel grade in a converter, wherein in the converter smelting process, scrap steel with low nitrogen content is used; the timing of adding alloy and slag material during the converter tapping process is delayed, the molten steel is controlled to be O>=200ppm at the argon blowing station; from the end of the converter tapping to the opening of the ladle at the argon blowing station, argon with a flow rate of <=5Nm 3 / h is blown for 1.5 min; at the ladle to the argon blowing station, argon with a flow rate of 30-50 Nm 3 / h is blown for 120-180 s to ensure melting of the alloy and slag material; subsequent aluminum wire feeding and deoxidization alloying are performed to achieve O<=10ppm and Als=0.015-0.045% of the molten steel; then, argon with a flow rate of 30-50 Nm 3 / h is blown for 60-120 s; the titanium-containing steel grade is fed with FeTi70 wire at the argon blowing station to perform Ti alloying process, and low-nitrogen FeTi70 wire with nitrogen content <=1000ppm is selected in this stage; then, argon with a flow rate of <=5Nm 3 / h is blown to perform molten steel calcium wire feeding and calcium treatment, and a splash-proof calcium wire is used; finally, argon with a flow rate of <=5Nm 3 / h is continuously blown for 300-500 s until the molten steel leaves the station. The present application can effectively reduce the nitrogen content of the molten steel in the converter, and the N content of the molten steel is <=35ppm.

The application relates to the technical field of tobacco processing equipment, and discloses a vertical boiler deoxidization system, which comprises a deoxidizer, a deoxidization head and a heat exchanger. The deoxidizer is provided with a hydrophobic inlet, a hydrophobic outlet and the deoxidization head. The deoxidization head is provided with a soft water inlet and an exhaust port. The hydrophobic inlet and the hydrophobic outlet are both used for being communicated with a hydrophobic pipe of a boiler to form a hydrophobic deoxidization loop. The soft water inlet is communicated with a soft water pipe. The soft water pipe is used for being communicated with a soft water source outside. The heat exchanger is provided with an air inlet, an air outlet, a water inlet and a water outlet. The air inlet is communicated with the exhaust port through an exhaust pipe. The water storage tank is communicated with a water inlet pipe, a water outlet pipe and a first connecting pipe. The water inlet pipe is communicated with an upstream of the soft water pipe. The water outlet pipe is communicated with a downstream of the soft water pipe. The first connecting pipe is communicated with the water outlet. The soft water pipe is communicated with the water inlet through a second connecting pipe. The exhaust steam energy of the deoxidizer is fully recovered, and the energy utilization rate is improved.

The application discloses a preparation method of hexagonal boron nitride single crystal material and belongs to the technical field of hexagonal boron nitride single crystal. The preparation method of the hexagonal boron nitride single crystal material comprises the steps of raw material deoxidization, high-temperature growth, annealing treatment and single crystal peeling, wherein the stainless steel alloy sheet is used as a fluxing agent, and more preferably, the 316 stainless steel alloy sheet is used, which contains rich element composition components, can improve the growth quality of the hexagonal boron nitride single crystal material from various aspects, is helpful to obtain single crystal material with high quality and large size, and in the process of high-temperature growth, the sample is placed in the form of a hexagonal boron nitride powder layer-stainless steel alloy sheet layer-hexagonal boron nitride powder layer, so that the contact area between the powder and the stainless steel alloy can be improved, and the effect of the stainless steel alloy sheet fluxing agent can be maximally exerted.

The application discloses a kind of self-adapting steam deoxidation and waste heat recovery's collaborative control device, it is related to waste heat recovery related technical field, including: steam deoxidation device, including steam diffuser and spray module, set first and second steam diffusion layer;Waste heat recovery device, waste heat recovery cavity is communicated with exhaust passage, including condensing module;Communication connection module, the communication connection between steam deoxidation device and waste heat recovery device is established;Condensing parameter control module, according to steam diffusion layer label is carried out self-adapting analysis to condensing control parameter, exports condensing control parameter, the high-temperature steam discharged to steam deoxidation device is recycled.It solves the technical problems existing in prior art that steam deoxidation device waste heat recovery efficiency is low, condensing parameter is fixed and cannot adapt to different steam diffusion layer level working condition, reaches according to steam deoxidation operating state intelligent adjustment condensing parameter, high-efficiency recovery waste heat, improve energy utilization efficiency and ensure the technical effect of steam deoxidation stability.

The invention relates to the technical field of metallurgical manufacturing, and discloses a continuous casting method of high-purity rare earth modified high-precision cold-working die flat steel, which comprises the following steps: S1, smelting to obtain clean die steel liquid, and injecting the clean die steel liquid into a tundish; s2, a functional gradient self-breathing electrochemical reaction immersion tube is installed at the bottom of the tundish; s3, an anode lead on the outer wall of the immersion pipe is connected to the positive electrode of a direct-current power source, and a conductive stopper rod in the tundish or an electrode inserted into molten steel is connected to the negative electrode of the direct-current power source; and S4, in the continuous casting process, the negative-pressure air extractor is started, direct-current voltage is applied, and the inner-layer rare earth precursor is driven to be subjected to a reduction reaction on the inner-layer interface of the molten steel to release rare earth atoms to enter the molten steel. The gradient electrochemical immersion pipe is coupled with negative pressure, rare earth in-situ injection and deep deoxidation are achieved, the rare earth yield and the molten steel purity are improved, nozzle nodulation is eliminated, and continuity and stability of continuous casting operation are guaranteed.

The invention belongs to the technical field of iron and steel smelting, and relates to a method and a control system for smelting heavy rail steel by using an electric furnace as a primary smelting furnace, the control system comprises a raw material proportioning module and a process control module; the raw material proportioning module is used for calculating a raw material structure based on a batching model of target components of a steel grade so as to compensate element change in a smelting process; the process control module is used for controlling electric furnace smelting, LF refining and VD / RH degassing processes so as to optimize the purity of molten steel; the raw material proportioning module outputs a raw material structure to the process control module for automatic proportioning of an electric furnace; the method comprises the following specific steps: calculating a raw material structure and electric furnace burdening based on a burdening model; in electric furnace smelting, nitrogen is controlled to be smaller than or equal to 0.005%, carbon is controlled to be larger than or equal to 0.15%, phosphorus is controlled to be smaller than or equal to 0.012%, and oxygen is controlled to be 0.02%-0.03%; in LF refining, carbon powder / silicon carbide balls are adopted for pre-deoxidation, the slag alkalinity is controlled to be 2.0-3.0, and soft blowing is larger than or equal to 15 min; and the VD / RH degassing is greater than or equal to 15 min, and qualified molten steel is obtained.

The application discloses a preparation method of a martensite sulfur-containing free-cutting stainless steel for aviation, which comprises the following steps: adding industrial pure iron, a nickel plate, low-carbon chromium iron and a returned steel into an electric furnace to smelt, and adjusting the composition of the molten steel to control the composition; the percentage by weight of C is 0.22-0.25%, the percentage by weight of Si is 0.10-0.25%, the percentage by weight of Mn is 1.10-1.20%, the percentage by weight of P is 0.10-0.13%, the percentage by weight of Cr is 12.50-13.50%, and the percentage by weight of Ni is 1.65-1.90%; inserting sulfur powder sealed by a thin skin tube into the molten steel, stirring uniformly, then adding BaAlSi alloy to perform final deoxidization, and pouring into an electric slag blank after discharging; performing electric slag remelting on the electric slag blank, wherein the electric slag remelting slag system comprises 30-40 wt% CaF2 powder, 25-35 wt% Al2O3 powder, 20-30 wt% SiO2 powder, 3-7 wt% MgO powder and 3-7 wt% manganese metal particles; after the electric slag remelting ingot is obtained, the ingot is sent into a forging heat processing furnace to be heated, then forging is performed, the forged ingot is sent into an annealing furnace to be annealed, and the martensite sulfur-containing free-cutting stainless steel for aviation is obtained. The preparation method can effectively control the content of sulfur and manganese elements and improve the comprehensive yield of Y25Cr13Ni2.

The utility model provides a multi-stage combined deoxidation tank. The multi-stage combined deoxidation tank comprises an upper tank body, a middle tank body and a lower tank body which are connected through flanges, a water inlet is formed in the side wall of the upper tank body; an inner cavity of the first-stage deoxidization chamber is a first-stage deoxidization chamber and is sequentially provided with a gas-liquid separation net, an atomizer, a first-stage deoxidization filler layer and a supporting grating plate I from top to bottom; a diversion unit and a porous liquid homogenizing plate are arranged in an inner cavity of the middle tank body; a sewage outlet and a liquid outlet are formed in the bottom of the lower tank body, and a medicament inlet is formed in the side wall; an inner cavity of the secondary deoxidizing chamber is a secondary deoxidizing chamber, and a secondary deoxidizing filler layer, a supporting grating plate II, a temperature control coil pipe and a supporting grating plate III are sequentially arranged in the secondary deoxidizing chamber from top to bottom. According to the multi-stage combined deoxidation tank, a multi-stage combined mode of vacuum deoxidation and chemical deoxidation is adopted, the deoxidation effect is good, the deoxidation efficiency is high, and the medicament consumption is low; the vertical integrated design of the upper, middle and lower tank bodies is adopted, the structure is compact, and the occupied area is reduced.

The invention discloses a device and a method for preparing oil by biomass coupling oil sludge pyrolysis based on photo-thermal energy storage, and the device is characterized in that the device comprises a fused salt heating device, a biomass gasification device, an oil sludge pyrolysis device and a hydrodeoxygenation device, the fused salt heating device comprises a photo-thermal tower for heating fused salt, the low-temperature molten salt tank and the high-temperature molten salt tank are connected to the photo-thermal tower through pipelines, and high-temperature molten salt in the high-temperature molten salt tank is respectively communicated to the steam generator, the gasification furnace, the hydrogenation chamber and the pyrolysis furnace through pipelines. The device and the method for preparing oil based on photo-thermal energy storage biomass coupling oil sludge pyrolysis aim at achieving efficient resource utilization of biomass and oil sludge, the whole process is green and low-carbon, and the device and the method have important popularization value and are worthy of popularization. The method has important significance in expanding a photovoltaic photo-thermal energy storage utilization mode and promoting harmless resource utilization of the biomass and the oil sludge, and has relatively high practicability and relatively good application prospects.

The invention relates to the technical field of hydrogen purification, in particular to a multi-dryer alternative selective hydrogen purification system, which comprises an impurity removal assembly, a gas-water separation component, a deoxidization piece connected with the gas-water separation component, and a hydrogen cooling piece connected with the deoxidization piece; a plurality of groups of drying assemblies are arranged, and each group of drying assembly comprises a regeneration cooling piece connected with the hydrogen cooling piece and a drying part connected with the regeneration cooling piece; and the switching assembly is arranged between the hydrogen cooling piece and the multiple sets of drying assemblies, different working states formed by the multiple sets of drying box bodies are utilized, so that different levels of operation is conducted on hydrogen purification, and the hydrogen purification efficiency and the purification yield are improved.

The utility model belongs to screening device technical field especially relates to a kind of steelmaking deoxidization aluminium particle grading screening device, including shell, vibrating machine, several fixed frames and several aluminium particle filter screen, further include: fixed plate, fixed plate plug-in installation is in the left side of shell, several limit strips are plug-in installed in fixed plate, several fixed frames are all plug-in installed in shell, and several fixed frames are fixedly connected with several limit strips respectively, several aluminium particle filter screens are fixedly installed on several fixed frames respectively, vibrating machine is fixedly installed in the front side of shell;Fixed component, fixed component is located in fixed plate, and is used to fix the position of fixed plate;Several through holes, several through holes are all set up in shell and all be located in the right side of several fixed frames, it is convenient to repair several aluminium particle filter screens, and it is convenient and simple to operate without using tool, simultaneously ensure that dust cannot overflow to outside, and ensure that dust filter screen is not jammed when using.

The invention discloses a method for smelting sulfur-containing steel based on a multi-step composite deoxidation technology. The method comprises the working procedures of electric furnace / converter smelting, LF external refining, RH / VD vacuum refining and continuous casting. The LF external refining process comprises the steps that 30-50 kg of carbon powder is scattered on the slag surface after gas testing, a lower electrode is heated, 50-80 kg of SiC is added in the heating process, and the binary alkalinity of slag is controlled to be 3-5; in the RH / VD vacuum refining process, the vacuum degree is smaller than or equal to 67 pa, the deep vacuum holding time is longer than or equal to 20 min, 40-50 kg of aluminum particles are added 5-7 min before vacuum breaking, the [O] content is controlled to be 9-13 ppm before the aluminum particles are added, calcium feeding treatment is not conducted after the aluminum particles are added, soft blowing is conducted for 5-10 min after vacuum breaking, and the aluminum particles are fed into a sulfur line and then directly discharged from a station. The proportion of sulfide composite inclusions in the sulfur-containing steel smelted through the method reaches 15% or above, the fine series of A-type inclusions of rolled metal is smaller than or equal to 1.5 grades, and the coarse series of the A-type inclusions of the rolled metal is smaller than or equal to 0.5 grades.

The invention discloses a crude argon hydrodeoxygenation system and a purification and liquefaction system and method, and belongs to the technical field of argon purification. According to the crude argon hydrodeoxygenation system, the first circulating compressor is arranged, and deoxidized gas is partially returned to the mixer to be mixed with oxygen-containing crude argon and hydrogen. As a diluent, the recycle gas can reduce the concentration of reactants entering the catalytic furnace. The control unit dynamically adjusts the hydrogen adding amount and the circulating gas flow according to the oxygen and hydrogen concentration and temperature signals, so that accurate and effective control over the temperature rise of the hydrodeoxygenation reaction is achieved, and the problem that the temperature rise of a catalyst bed is too high when crude argon with the high oxygen content is deoxidized is fundamentally solved. According to the purification and liquefaction system, the deoxidation system is integrated with deep purification, denitrification and liquefaction units, so that safe, efficient and energy-saving production from crude argon waste gas to high-purity liquid argon is realized, and the recovery rate and the product value of argon resources are remarkably improved.

The utility model relates to a composite deoxidizer adding device for electroslag remelting, which comprises a consumable electrode, a wire feeder, an operating platform and a lead frame, grooves are arranged on two sides of the consumable electrode, the operating platform is arranged above the consumable electrode, the wire feeder is mounted on the operating platform, the lead frame is connected with the operating platform, and the consumable electrode is connected with the lead frame. And the wire feeding machine can feed the composite deoxidizer alloy wire into the molten pool along the groove through the lead frame. The device has the advantages that the structure is simple and reasonable, a deoxidizing agent can be stably added into a molten pool in the electroslag remelting process, double-channel adding of different types of deoxidizing agents is achieved, the adding amount of the deoxidizing agent can be adjusted online in real time according to the conveying speed of a wire feeding machine, molten steel oxygenation in the electroslag remelting process is effectively controlled, and the production efficiency is improved. Stable control over product components is guaranteed, effective deoxidation is achieved, the internal quality of electroslag steel ingots is improved, and the production cost is reduced.

The invention belongs to the technical field of welding materials, discloses a layered-structure low-splashing flux-cored wire and a preparation method thereof, and solves the problems of serious splashing and poor welding seam performance caused by discontinuous action of an arc stabilizer, insufficient molten pool core deoxidation and coarse welding seam grains of an existing flux-cored wire. The welding wire comprises a low-carbon steel strip metal outer skin and a layered flux core (an outer layer and an inner layer), wherein the outer layer flux core is located on the inner surface of the outer skin, accounts for 8-12% of the total mass of the welding wire, and comprises a mesoporous SiO2-KI compound, a CaF2-MgO-La2O3 composite slag former and the like; the center of the outer layer is filled with the inner layer flux core, the inner layer flux core accounts for 10%-18% of the total mass of the welding wire, TiC-coated ZrB2 core-shell particles (relay deoxidation and grain refinement), Fe-Sc-Ti alloy powder (collaborative deoxidation) and the like are contained, and the total proportion of the inner layer and the outer layer is 18%-26%. Compared with a traditional welding wire, the splashing amount is reduced by 30%, the tensile strength of a welding seam is improved by 20% or above, and the flux-cored wire is innovative.

The invention discloses a flux-cored wire for cavity-divided isolation time sequence release and in-situ synthesis CO2 gas shielded welding, and belongs to the technical field of welding materials. The welding wire comprises a DC07 low-carbon steel metal skin and a double-channel flux core, and the two channels are physically isolated through an integrally-rolled partition wall. The function time sequence release channel is composed of an arc plasma modulation layer and a gas passivation and slagging layer, contains a Y2O3-multi-walled carbon nanotube composite stabilizer and polytetrafluoroethylene aluminum-coated core-shell particles, and achieves arc stabilization and oxygen inhibition; an in-situ synthesis channel contains a Ni-Al self-propagating system and a strong deoxidizing agent, and molten pool deoxidization and grain refinement are achieved. The total filling rate of the flux core is 22%-28%, and the diameter of the welding wire is 2.0-4.0 mm. The problems that a traditional welding wire is high in splashing rate, unstable in electric arc and insufficient in weld joint obdurability are solved, the splashing rate is smaller than or equal to 2.5%, and the tensile strength of a weld joint reaches 580-702 MPa.

The invention relates to a medium-pressure process argon recovery device with low unit consumption and high argon recovery rate and a recovery method thereof. Comprising a feed gas dust removal and pressurization system, a feed gas buffer compression system, a feed gas decarbonization system, a feed gas deoxidation and drying system, a water electrolysis hydrogen production system, a cold box, a nitrogen-hydrogen-argon mixed gas circulation compression system, a feed air filtration and compression system, an air pre-cooling and purification system and a liquid storage and vaporization system. The cold box is composed of a main heat exchanger, a primary argon rectifying tower, a waste gas rectifying tower, a nitrogen-making rectifying tower, an expansion machine, an auxiliary condenser, a nitrogen-making condensing evaporator, a cooling capacity supplementing system and the like which are connected and controlled through pipelines and valves. The method has the advantages of high argon recovery rate, low argon production unit consumption and the like. The low-temperature rectification separation principle is utilized, secondary rectification is carried out on the non-condensable waste gas discharged by primary rectification of the argon tower, and the argon recovery rate of the cold box of the medium-pressure flow argon recovery device in the hydrogen-containing process reaches 99% or above.