144 results about "Mangalloy" patented technology

The application relates to a method for smelting high-manganese steel in a converter, and belongs to the technical field of steelmaking. The technical problem to be solved by the application is that the manganese content of end-point molten steel produced by a converter in the prior art is low. The technical solution provided by the application for solving the above technical problem is that carbon balls and high-carbon ferromanganese are added in stages according to oxygen supply amount in the smelting process of the converter, when the oxygen supply amount is within 0-10% and 10-80%, 30% and 70% of manganese alloy are respectively added; and when the oxygen supply amount is within 0-10%, 10-50%, 50-80% and 80-100%, 20%, 40%, 30% and 10% of carbonaceous raw materials are respectively added. Compared with the current process for producing high-manganese steel in a converter, the application reduces the investment of alloy heating furnaces and other equipment, meets the production requirements of more varieties of high-manganese steel, improves the metal yield of manganese, shortens the production cycle, and reduces the production cost of high-manganese steel.

The invention provides a method for improving the manganese recovery rate of a silicon-manganese alloy, which comprises the following steps: sequentially filling smelting raw materials into a closed electric furnace for smelting to obtain an alloy melt; transferring the alloy melt into a steel ladle, and blowing magnesium powder for desulfurization; the desulfurized alloy melt is subjected to slagging-off, and manganese-silicon alloy molten iron is obtained; the manganese-silicon alloy molten iron is poured into a mold for ingot casting, and a manganese-silicon alloy finished product is obtained after cooling; the smelting raw materials are sequentially filled with a backing material, a mixture and a surface material from bottom to top in the closed electric furnace; the surface material comprises aluminum powder and calcium carbide which are mixed according to a certain proportion, in the method, the surface material comprises the aluminum powder and the calcium carbide which are mixed according to a certain proportion, the effect of a reducing agent can be achieved while the ignition effect is achieved, manganese can be directly reduced in the reaction through addition of the aluminum powder, and therefore the effect of improving the manganese recovery rate is achieved.

According to the efficient smelting method and device for the silicon-manganese alloy, the manganese ore and the silica are crushed into proper particle sizes, the contact area between the raw materials is increased, the reaction speed is increased, the raw materials are fully reacted in the furnace, the proportion of the raw materials is adjusted, the reaction is more sufficient, and the qualified rate of products is increased; during smelting, a high-precision sensor is used for monitoring parameters such as temperature, pressure, current and voltage in the furnace in real time, a distributed control system is used for automatically adjusting smelting process variables such as electrode lifting, power supply power and raw material feeding speed according to the parameters monitored in real time, and it is ensured that reaction in the furnace is conducted in the optimal state; smelting hot air is filtered through the filter box and then discharged into the mixing box through the centrifugal suction pump, raw materials are scooped up and fall down while mechanical mixing is conducted, the sufficient mixing and preheating effect is guaranteed in cooperation with hot air introduction, and finally the effects of improving the heat source utilization rate, sufficiently mixing and preheating and efficiently smelting are achieved.

The invention belongs to the technical field of cold forging steel manufacturing, and particularly discloses a production method of high-aluminum cold forging steel for medium-strength and high-strength standard parts, which comprises the following steps: controlling the slag alkalinity, the contents of C, S and P in molten steel, the tapping temperature, the thickness of a steel ladle slag layer and the tapping time during converter smelting; a deoxidizing agent, lime, low-carbon ferromanganese, silicon-manganese alloy, aluminum-iron alloy and a carburant are added, argon is blown into molten steel when calcium-iron wires are fed in an argon blowing station, components of a refining slag modifier are controlled to be added during LF refining, calcium carbide and the aluminum-iron alloy are added according to the oxygen content and the aluminum content in the molten steel, a tundish for continuous casting is protected by argon, and the molten steel is continuously cast. The thickness of a powder slag layer and the thickness of a liquid slag layer are controlled, a covering agent is added into the tundish, the purity of molten steel is increased by adjusting the whole process section, and therefore follow-up tundish nozzle nodulation is reduced, and the problem that in the prior art, due to the fact that the purity of molten steel is low, a high-aluminum cold heading steel casting continuous casting tundish nozzle is prone to nodulation is solved.

The utility model relates to the technical field of silicon-manganese alloy cooling, and discloses a silicon-manganese alloy granulation rapid cooling tower which comprises a storage barrel, a first partition plate is fixedly connected to the middle of the inner wall of the storage barrel, a compressor is fixedly connected to the left side of the top of the first partition plate, and a connecting pipe is fixedly connected to the top of the compressor. A condenser is fixedly connected to one end of the connecting pipe, a water pump is fixedly connected to the right side of the top of the first partition plate, a water outlet pipe is fixedly connected to the front end of the water pump, a water suction pipe is fixedly connected to the top of the water pump, and a cooling box is fixedly connected to one end of the water suction pipe; the right end of the water injection pipe is fixedly connected with the bottom of the left side of the outer wall of the cooling box. According to the utility model, a refrigerant is compressed through the compressor, the refrigerant is sent to the condenser through the connecting pipe for heat exchange, the water pump is started, and the cooling liquid subjected to cooling treatment in the cooling box is sucked back through the water suction pipe.

To provide a method and an apparatus for producing carbon-recovering type manganese-based alloys by which the reduction of CO2 discharge is made possible.SOLUTION: A method for producing a carbon-recovering type manganese-based alloy includes a step (A) of charging a manganese ore-derived raw material having a manganese oxidation degree of 1.0 to 1.1 and a carbonaceous material into an electric furnace to perform refining, and then performing slag / metal separation, and a step (B) of producing a synthetic fuel using carbon monoxide contained in a by-product gas generated from the electric furnace as a raw material.SELECTED DRAWING: None

The utility model provides a silicomanganese alloy flue gas waste heat recovery heating device, and relates to the field of flue gas waste heat recovery, the silicomanganese alloy flue gas waste heat recovery heating device comprises a recovery mechanism, the upper side of the recovery mechanism is provided with a filtering mechanism, the filtering mechanism is internally provided with a switching mechanism, and the upper side of the switching mechanism is detachably provided with three first filter elements; two supporting and adjusting mechanisms are detachably mounted outside the recycling mechanism, and second filter elements are arranged on the upper sides of the supporting and adjusting mechanisms. Through cooperation of the driving motor, the transmission gear, the teeth, the rotating table and other structures, the multiple first filter elements can be integrated in the mounting pipe in a circumferential array mode, when the filtering efficiency is reduced due to blockage of a certain filter element, the driving motor only needs to be started through an external controller, the rotating table can be driven to rotate, and the filtering efficiency is improved. The standby filter element is quickly switched to the working position, shutdown or disassembly is not needed in the process, and the problems that a filter element of a traditional structure is tedious in replacement operation, time-consuming and labor-consuming are solved.

The utility model discloses a manganese alloy additive forming die which comprises stamping equipment and a die plate, fixing bases are evenly distributed at the bottom of the stamping equipment, stamping bases are detachably installed at the bottoms of the fixing bases, the die plate is arranged below the stamping bases, die holes are formed in the die plate, and the die holes and the stamping bases are arranged in a one-to-one correspondence mode. A first supporting plate is arranged below the mold plate, an ejection mold block is arranged at the position, located below the mold hole, of the first supporting plate, a stamping base is detachably installed at the bottom of the fixed base, and the stamping base is stamped into the mold hole and extrudes the ejection mold block, so that manganese alloy stamping forming machining is achieved, stretching and retracting of a first telescopic rod are achieved, and the mold plate is pulled down. And the ejection mold block is ejected into the mold hole, so that the formed manganese alloy block is ejected out, and the demolding production of the manganese alloy block is realized.

The present invention provides a production method for reducing the incidence of edge cracks of Q235 wide and thick slabs, comprising the following steps: (1) converter smelting, with an iron-steel ratio of 850 kg / t, and adding silicon-manganese alloy and ferrosilicon weak deoxidation during the steel tapping process; (2) adding fluorite, lime, calcium carbide, and Taiwan aluminum to LF for strong stirring to promote sufficient pre-melting of the slag, diffusion deoxidation, and then power supply to form white slag, with the LF outlet composition controlled as follows: C: 0.15-0.18%, Si: 0.15-0.30%, Mn: 0.55-0.65%, P≤0.035%, ALs: 0.007-0.015%, S≤0.010%; (3) continuous casting process :A. The cross-section of the slab casting machine is 300mm×2200mm, and the casting speed is 0.80m / min; B. An immersion nozzle with an outlet inclination angle of 12°, an area of ​​4500 square millimeters, and an insertion depth of 110-140mm is adopted; C. Low melting point, low alkalinity, and low viscosity mold slag is used to slow down heat transfer; D. Weak cooling is adopted for secondary cooling water distribution; E. The side taper of the crystallizer is 1.2%; F. The sum of the inner and outer arcs of the wide surface taper of the crystallizer is controlled at 1.6-2.4mm, and the inner and outer arcs are both controlled at 0.8-1.2mm. The method of the present invention can reduce the incidence of subcutaneous cracks on the edge of Q235 wide and thick slabs to below 1%.

The application belongs to the technical field of metallurgy, and discloses a high-purity raw material low-carbon silicon-manganese alloy precise smelting method. The method adds 0.1%-0.3% of nano CaO-Al2O3 composite catalyst in electrolytic manganese, silica and semi-coke raw materials, and then smelts in stages in an inert atmosphere ore-heating electric furnace after mixing and briquetting; the catalyst forms CaAl2O4 active phase at 1550-1650 DEG C, selectively adsorbs and activates SiO2, and reduces the reduction activation energy of SiO2 by 46.4%, while Fe2O3 is inhibited from reduction due to difficult adsorption. The application breaks through the inherent constraints of thermodynamics and kinetics in traditional silicon-manganese alloy smelting by constructing a nano catalyst-selective reduction technology paradigm, significantly reduces energy consumption and carbon emissions, and simultaneously realizes the multiple goals of low carbonization, high purification and greenization without sacrificing production efficiency.

The invention relates to the technical field of silicon-manganese alloy processing, and discloses a low-carbon silicon-manganese alloy processing mixing feeding device which comprises a conveyor, a mixing conveying assembly is arranged on one side of the conveyor, the conveyor comprises a fixed support, a groove-shaped conveying belt is arranged at the upper end of the fixed support, and a closed shell is fixedly arranged on the outer side of the groove-shaped conveying belt; a plurality of groups of discharging hoppers are fixedly mounted at the upper end of the closed shell, a discharging assembly is fixedly mounted at the output end of the groove-shaped conveying belt, and a driving motor is linked with a U-shaped connecting rod to drive a wavy mixing pipeline to achieve periodic movement that the upper section moves downwards to stretch a corrugated pipe and the lower section is lifted upwards to support the pipeline; the materials are disturbed by axial push-pull shearing force, radial centrifugal overturning force and local air pressure, so that the mixing uniformity of the materials is improved to 85% or above from the existing lower than 65%, the form of each material is not changed in the whole process, and the processing key parameters such as the granularity and the density of the raw materials are not influenced.

The invention discloses a low-energy-consumption submerged arc furnace for producing silicon-manganese alloy, and relates to the technical field of submerged arc furnaces. The low-energy-consumption submerged arc furnace for producing the silicon-manganese alloy comprises a submerged arc furnace body and further comprises a self-baking electrode, one end of the self-baking electrode is inserted into the submerged arc furnace body, the other end of the self-baking electrode is exposed above the submerged arc furnace body, an electrode shell is welded to the upper end of the self-baking electrode, die holes are evenly formed in the side wall of the electrode shell, electrode paste is sintered in the electrode shell, and the die holes are formed in the side wall of the electrode shell. The length of the self-baking electrode is continuously increased; the grooving die head is positioned on the periphery of the electrode shell; according to the self-baking electrode in the low-energy-consumption submerged arc furnace for producing the silicon-manganese alloy, the electrode length is increased by sintering the electrode paste in the electrode shell, the conductive fins can be reused, the replacement period of the conductive fins is greatly prolonged, and the cost is saved; therefore, large holes do not need to be formed in the furnace cover, and the amount of spark spraying in the furnace is greatly reduced.

To provide a manufacturing method of very low carbon ferromanganese that makes it possible to reduce CO2 exhaust in manufacture of ferromanganese and its manufacturing apparatus.SOLUTION: A method for producing an extremely low carbon manganese-based alloy, comprises: a step (1) of carbon-reducing manganese ore or reduced manganese ore; a step (2) of performing molten slag-metal separation; and a step (3) of reducing the separated molten slag with a non-carbon reductant to perform refining, followed by slag-metal separation.SELECTED DRAWING: None

The invention provides high-nitrogen vanadium steel and a preparation method thereof.The preparation method comprises the following steps that raw materials of the high-nitrogen vanadium steel are subjected to converter smelting and ladle refining, and refined molten steel is prepared; the components of the refined molten steel contain nitrogen and vanadium; the refined molten steel is sequentially subjected to casting treatment and rolling treatment, and the high-nitrogen vanadium steel is prepared; wherein steel coke powder is added to the bottom of a steel ladle before ladle refining is carried out on molten steel obtained after converter smelting, and in the tapping process of converter smelting, the following steps are carried out: when 1 / 4 of the weight of steel is tapped, a silicon-aluminum-calcium deoxidizing agent is added to the steel flow, and when 2 / 3 of the weight of the steel is tapped, a silicon-manganese alloy and a high-carbon manganese-iron alloy are added to the steel flow; the temperature of the rolling treatment is 810-850 DEG C; according to the preparation method, the combination amount of nitrogen and vanadium can be increased, so that the mechanical property of the high-nitrogen vanadium steel is improved.

The utility model provides a hot charging and hot conveying device of a large silicon manganese ore heat furnace. The hot charging and hot conveying device for the large-scale silicon manganese submerged arc furnace comprises a rail conveying vehicle body used for conveying silicon manganese alloy materials processed by the submerged arc furnace; the rail transfer cart comprises a rail transfer cart body and two mounting plates arranged on the rail transfer cart body, connecting shafts are rotatably mounted on the two mounting plates, a hot delivery box used for hot charging and hot delivery of silicon-manganese alloy materials processed by a submerged arc furnace is fixedly mounted on the two connecting shafts, and a feeding pipe is arranged on the hot delivery box. According to the hot charging and hot conveying device of the large-scale silicon-manganese hot furnace, hot charging and hot conveying treatment can be conducted on silicon-manganese alloy raw materials processed by the silicon-manganese hot furnace, meanwhile, the problem that the silicon-manganese alloy raw materials make contact with oxygen to be oxidized in the conveying process can be avoided, the safety of hot charging and hot conveying of the silicon-manganese alloy raw materials is improved, and discharging is convenient.

The present application relates to the technical field of metallurgical chemical industry, in particular to a silicon-manganese alloy smelting method, comprising the following steps: raw material pretreatment, gradient reduction smelting, tapping and refining, and flue gas slag cooperative treatment.In the silicon-manganese alloy smelting, lanthanum cerium oxides in the rare earth composite material react with impurities such as sulfur, phosphorus and oxygen in the melt at high temperature, forming high-melting-point compounds and separating with the molten slag, effectively reducing the impurity content, at the same time, the rare earth elements segregate at the grain boundaries, inhibiting atomic diffusion and migration, significantly refining the alloy grain size, and the rare earth composite material is optimized through the dual action of chemical purification and physical modification, solving the problems of impurity segregation and insufficient toughness in the traditional silicon-manganese alloy smelting process, and significantly improving the mechanical properties of the silicon-manganese alloy.

The application discloses a kind of high-strength packing belt raw material steels with strength above 1000MPa, which is characterized in that the chemical components are as follows: C: 0.19-0.25%, Si: 0.05-0.30%, Mn: 1.20-1.57%, P≤0.030%, S≤0.025%, Alt: 0.020-0.050%, Ca: 0.0008-0.0020%, and the balance is Fe and inevitable impurities; and a specific production method is also disclosed. The purpose of the application is to provide a kind of high-strength packing belt raw material steels with strength above 1000MPa and its production method. By adding carbon, silicon, manganese alloying elements to strengthen the design mechanism, using low-temperature controlled rolling and controlled cooling process for hot rolling, and using more than 70% high-pressure reduction ratio for pickling, a high-strength packing belt raw material steel with 1000MPa high strength and certain elongation is obtained.

The invention discloses a polyurethane flame-retardant sound-insulation composite board with a multi-layer structure and a preparation method thereof, and belongs to the technical field of composite boards, nickel nitrate is used as a nickel source, ferric nitrate is used as an iron source, nickel ferrite powder is obtained through a solvothermal method and a high-temperature calcination method, the nickel ferrite powder is compounded with graphene oxide to obtain composite aerogel powder, the surface of the composite aerogel powder is coated with polydopamine, and the flame-retardant sound-insulation composite board with the multi-layer structure is obtained. The enhanced aerogel powder is obtained; the preparation method comprises the following steps: preparing functional rigid polyurethane foam from polyether polyol, polymethylene polyphenyl polyisocyanate, enhanced aerogel powder, ammonium polyphosphate, magnesium hydroxide and a foaming aid through a one-step foaming method, putting the functional rigid polyurethane foam as a core layer between an aluminum-magnesium-manganese alloy color steel plate and a porous sound insulation plate, and carrying out hot-pressing compounding, so as to obtain the aluminum-magnesium-manganese alloy color steel plate / porous sound insulation plate. The polyurethane flame-retardant sound-insulation composite board with the multi-layer structure is obtained; and comprehensive improvement of flame retardance, sound insulation, heat insulation, electromagnetic shielding and dimensional stability is realized.

The invention discloses a nickel-iron-chromium-aluminum-manganese alloy and a preparation method thereof, and the nickel-iron-chromium-aluminum-manganese alloy comprises the following chemical elements in percentage by mass: less than or equal to 0.0500% of carbon, less than or equal to 0.6000% of silicon, less than or equal to 3.0000% of manganese, less than or equal to 0.0250% of phosphorus, less than or equal to 0.0200% of sulfur, less than or equal to 8.0000% of nickel, 20.00000%-27.0000% of chromium, 7.0000%-7.5000% of aluminum and the balance of iron. According to the nickel-iron-chromium-aluminum-manganese alloy prepared by adopting the formula and the method disclosed by the invention, the highest resistivity can reach 1.65 omega.m, the resistivity is effectively improved, the efficiency of converting electric energy into heat energy is higher, meanwhile, the nickel-iron-chromium-aluminum-manganese alloy can pass a 24-hour salt spray test, and the high resistivity of the nickel-iron-chromium-aluminum-manganese alloy allows a shorter or finer alloy material to reach a target resistance value; and the cost of raw materials is reduced, a more compact heating unit can be designed in a space-limited scene (such as a small electric appliance), and the lightweight design is realized.

The application discloses a method for analyzing silicon nitride manganese alloy by glass melting X-ray fluorescence spectrum, and comprises the following steps: step one, mixing a sample and an oxidizing agent and placing them in the middle of a platinum yellow crucible with a flux on the bottom; step two, placing the sample in an electric heating automatic melting furnace to prepare a to-be-detected glass disc by borate melting; step three, completely melting, automatically casting, cooling the sample disc, demolding and obtaining a glass disc for X fluorescence analysis; and step four, optimizing analysis parameters, establishing a working curve, performing sample analysis and obtaining the content of measured elements. The application relates to the technical field of metallurgical chemical analysis and detection, and particularly relates to a method for analyzing silicon nitride manganese alloy by glass melting X-ray fluorescence spectrum.

This application provides a method for smelting a low-phosphorus silicon-manganese alloy, comprising: obtaining raw materials for smelting the low-phosphorus silicon-manganese alloy and pretreating the raw materials to obtain smelting raw materials; adding the smelting raw materials to an electric furnace for smelting to obtain a first low-phosphorus silicon-manganese alloy liquid; transferring the first low-phosphorus silicon-manganese alloy liquid to a shaking ladle and reacting for a first preset time to obtain a second low-phosphorus silicon-manganese alloy liquid; transferring the second low-phosphorus silicon-manganese alloy liquid to a ladle, spraying a first dephosphorizing agent into the ladle for a second preset time, allowing it to stand for a third preset time, and then removing slag to obtain a third low-phosphorus silicon-manganese alloy liquid; pouring the third low-phosphorus silicon-manganese alloy liquid into a mold to cast an ingot, and demolding it after cooling to obtain the finished low-phosphorus silicon-manganese alloy. This application, through pretreatment, shaking ladle operation, and spraying of the first dephosphorizing agent, reduces the phosphorus content and impurities in the finished low-phosphorus silicon-manganese alloy, thereby improving the purity of the finished low-phosphorus silicon-manganese alloy.

The present invention relates to the technical field of copper and its alloy processing, and specifically to a rolling processing method for copper and its alloy heterogeneous alloy composite foil. Rolled pure copper plates and copper-manganese alloy plates are used as raw materials, wherein the copper-manganese alloy plates can be copper-rich or manganese-rich. The rolled pure copper plates and copper-manganese alloy plates are surface-polished and spot-welded, and then diffusion-connected in a hot pressing furnace. The connected composite plates are hot-rolled and surface-polished, and then annealed in a vacuum heat treatment furnace. The annealed composite plates are cold-rolled on a continuous rolling mill at room temperature, and the cold-rolled composite foil is vacuum-heat-treated and annealed, and then stretched, bent, straightened, and strip-cut to obtain a finished composite foil. Thus, the problem that the application of pure metal foils in the prior art restricts the update and iteration speed of related products and cannot meet the requirements for further processing of the foils is solved.

The utility model discloses an iron recovery separator for silicomanganese alloy production, which relates to the technical field of silicomanganese alloy processing, and comprises a recovery shell, a feeding cover plate is hinged right above the recovery shell, a discharging cover plate is hinged on one side of the recovery shell, a crushing mechanism is arranged in the recovery shell, and a discharging cover plate is hinged on the other side of the recovery shell. A crushing mechanism is arranged in the recovery shell, the crushing mechanism is used for crushing ore in the recovery shell, then iron-containing ore and non-iron-containing ore are subjected to separation treatment, a screening mechanism is arranged under the crushing mechanism, the screening mechanism is used for adsorbing the iron-containing ore, then the iron-containing ore is guided out of the recovery shell, and separation treatment of the iron-containing ore is completed. In the using process, ore is ground through the fan-shaped grinding blocks, and in the machining process, the corresponding fan-shaped grinding blocks and the stirring plates are rotated according to the size of the ore, so that alloy is rapidly crushed, and the iron-containing part in the alloy is adsorbed and screened.

The utility model relates to the technical field of slag grabbing machines, and discloses a high-efficiency silicon-manganese alloy electric furnace slag grabbing machine which comprises a mounting block and two sets of grabbing hands, rotating grooves are symmetrically formed in the middles of the bottom ends of the two sides of the mounting block, and driving rods are horizontally welded to the top ends of the grabbing hands. And the middle part of the bottom side of the mounting block is vertically and rotatably connected with a screw rod through a bearing. According to the slag grabbing device, the servo motor is controlled to work, the lead screw can be driven to rotate, the two sets of first racks can be pushed to move downwards through the sliding plate, the driving rod can be driven to rotate through the second rack, and therefore the two sets of grabbing hands are driven to rotate relatively, and slag grabbing is achieved; the sliding plate stops moving, the servo motor continuously works and can drive the stirring rod at the bottom end of the lead screw to rotate, so that the slag on the inner sides of the two groups of grippers is stirred, residual liquid silicon-manganese alloy on the surface of the slag can be discharged through the liquid discharging hole, and resources are saved.

This invention relates to the field of welding materials technology, and more particularly to a low-slag, copper-free, gas-shielded solid welding wire and its preparation method. Molten iron and scrap steel are mixed and subjected to primary refining. After tapping, coke-silicon-manganese alloy is added for deoxidation and alloying. Under argon stirring, zirconium iron and iron-titanium are added to the resulting primary molten steel for alloying, followed by refining and vacuum degassing to obtain welding wire molten steel with the target chemical composition. This is then continuously cast, with iron powder added during the casting process, ultimately casting a welding wire billet. The welding wire billet is then rolled, peeled, and drawn to obtain a gas-shielded solid welding wire. In this invention, high-purity iron powder is fed into the continuous casting stage to provide active oxygen, allowing Ti and Zr to naturally generate nano-sized oxides with the active oxygen during the solidification of the molten steel, exerting the metallurgical fine-grain strengthening effect of oxides. Combined with low-silicon composite deoxidation and copper-free self-passivation treatment, this achieves slag-free, environmentally friendly, high-strength, high-toughness, and high-heat-induction stable welding of the welding wire.

This invention relates to the field of steel bar production technology, specifically to a 400MPa grade hot-rolled ribbed steel bar and its preparation method, comprising the following steps: Step 1: Converter steelmaking, controlling the final carbon content to 0.07%-0.09%, and sequentially adding a composite deoxidizer, silicon-manganese alloy, and ferrotitanium to the ladle; Step 2: Continuous casting, using a crystallizer immersion nozzle protection casting process; employing a secondary cooling process; the superheat of the tundish is 10-15℃; Step 3: Heating, with the heating temperature controlled at 1000-1040℃; Step 4: Rolling, with an initial rolling temperature of 1000-1040℃ and a controlled rolling temperature of 900-950℃; Step 5: Cooling, with a controlled cooling temperature of 860-890℃; Step 6: Producing the finished product. This invention improves the titanium recovery rate, reduces smelting costs, and improves the mechanical properties of hot-rolled ribbed steel bars.

The utility model discloses a spring needle pressing mechanism which comprises a carrier plate and a support, the carrier plate is hinged to the support, a small spring and a large spring are installed on the carrier plate, the large spring is fixedly installed on the face, opposite to the support, of the carrier plate, the small spring penetrates through the carrier plate in a sliding mode, the small spring is connected with a hook, the carrier plate rotates to be closed with the support, the large spring is compressed, and the small spring is reset. The carrier plate rotates to be opened from the support, the large spring resets, and the small spring is pulled to deform. According to the utility model, only two springs are used, the structure is simple, the manufacturing cost of equipment is greatly reduced, the operation is stable, the springs are naturally pressed and the pressing needles are opened during overturning by virtue of the self weight of the carrier plate and the carrier plate support frame, and the spring pressing needles are made of silicon-manganese alloy steel materials, so that the fatigue resistance is very high, and the stability is very good.

The invention aims to provide a process for smelting 200-series stainless steel in a VOD (Vacuum Oxygen Decarburization) furnace, which comprises the following steps: adding manganese mineral powder into a steel ladle in advance, then pouring molten stainless steel subjected to primary decarburization in an AOD converter into the steel ladle after slag stopping and tapping, and transporting the steel ladle to a VOD furnace station for vacuum decarburization treatment and reduction treatment after vacuum breaking. The addition amount of the manganese mineral powder is limited by the fact that the thickness of slag in a steel ladle at the initial stage of the vacuum decarburization step is smaller than or equal to 70 mm. The manganese ore is used as one of the manganese alloy sources, the cost is low, the manganese ore powder is firstly added to the bottom of the steel ladle and then poured into the molten steel, the manganese ore powder can be rapidly melted and prevented from escaping, the manganese ore powder is fully utilized in the VOD smelting process, and the yield of the manganese ore powder is increased; in addition, the manganese mineral powder serves as slag and an oxidizing agent in the vacuum decarburization process, the amount of blown oxygen needed by VOD decarburization is reduced, the VOD smelting time is shortened, and the VOD smelting efficiency is improved.

The invention discloses a production process of a tin-plated phosphor bronze wire for a transformer, and the production process comprises the following steps: S1, deoiling, pickling and activating a phosphor bronze wire to obtain a first phosphor bronze wire; s2, electroplating the first phosphor bronze wire in a pre-plating solution dissolved with tin methanesulfonate, indium trichloride and manganese sulfate, and washing to obtain a second phosphor bronze wire; s3, tinning the surface of the second phosphor bronze wire; the pre-plating solution further comprises a pH regulator, a complexing agent and an organic plating assistant. According to the production process of the tin-plated phosphor bronze wire for the transformer, indium salt, tin salt, manganese salt and indium salt are introduced into a pre-plating solution with tin salt and manganese salt as main salts, and reduction deposition is carried out on the surface of a copper wire at the same time to form a tin-manganese-indium alloy layer; the tin-manganese-indium alloy layer is favorable for optimizing the mechanical properties such as bending times, tensile strength and the like and the service life of the tin-plated phosphor bronze wire. The invention also discloses the tin-plated phosphor bronze wire prepared by the production process of the tin-plated phosphor bronze wire for the transformer.

The invention provides a hot-rolled steel strip for a high-corrosion-resistance anchor rod body and a preparation method and application of the hot-rolled steel strip. The hot rolled steel strip for the anchor rod body consists of the following components in percentage by weight: 0.16 to 0.20 percent of C, 0.15 to 0.25 percent of Si, 0.75 to 0.95 percent of Mn, less than or equal to 0.010 percent of P, less than or equal to 0.007 percent of S, less than or equal to 0.0040 percent of N, 1.58 to 1.62 percent of Cr, 0.20 to 0.30 percent of Cu, 0.01 to 0.03 percent of Ti, 0.03 to 0.06 percent of Sb, 0.002 to 0.003 percent of B, 0.8 to 1.00 percent of Ni and the balance of Fe and impurities. The hot rolled steel strip with high corrosion resistance and excellent obdurability can be obtained by adopting a component design thought of medium carbon and low manganese + Ni-Cr-Cu-Sb alloying + Ti microalloying and combining an adaptive controlled rolling and controlled cooling process.