16 results about "Molten steel" patented technology

The invention discloses a mass spectrometer based RH dynamic decarbonization method and device for real-time calculation of carbon content when in vacuum oxygen decarburization, and realization of automatic gun lifting and stopping of oxygen blowing when the carbon content of molten steel reaches target carbon content. The decarbonization method comprises the following steps: when a heat is started, the weight, initial component and target component data of the molten steel is collected, in the smelting process, waste gas real-time flow rate acquired by a waste gas flow meter and waste gas real-time component acquired by a mass spectrometer are collected; according to relevant information of the molten steel, and relevant data of the collection and analysis time delay of the waste gas and gun lifting and blowing-stop time delay of a top gun, the carbon content of the molten steel is calculated in real time, and when the current carbon content is smaller than or equal to the target carbon content, a PLC (programmable logic controller) is notified to stop oxygen blowing and lift the gun. The mass spectrometer based RH dynamic decarbonization device can realize the automatic control of mass spectrometer based RH dynamic decarbonization, is precise in control of process and high in production precision, can shorten the smelting cycle, and reduces the cost.

A NiCuSiFe alloy prepared from Ni and Cu contained waste through resmelting contains Ni (25-60 wt%), Cu (25-60), Si (8-15), impurity (less than or equal to 0.2) and Fe (the rest), and can also be used as additive for smelting refractory steel, high-weatherability steel and other alloy steel. Its advantages are low smelting point, high dispersity and deoxidizing effect in molten steel and low cost.

The invention relates to a production method of welding rod steel H08A and belongs to the technical field of ferrous metallurgy. The technical problems to be solved are that the continuous casting time is short in the production process of the welding rod steel H08A and a casting billet has obvious air bubble defects. According to the technical scheme, the production method of the welding rod steel H08A comprises steps of rotary furnace smelting, LF refining and continuous casting, wherein in the LF refining, a refining slag adjusting agent with principal components being Al, Al2O3 and CaO isadded for diffusion deoxidation, the degree of activity of oxygen in molten steel is controlled at 0.0020-0.0040%, the content of Als is 0.001-0.005%, silicoferrite is added with the content of Si controlled at 0.02-0.03%, and then calcium treatment is carried out. By establishing a reasonable molten steel control system, welding rod steel H08A continuous casting billets without internal defectscan be stably and continuously produced.

The invention relates to an investment casting mould of a high-temperature alloy bending pipe. The investment casting mould comprises a bending pipe shell which is vertically placed, wherein the two pipe mouth ends of the bending pipe shell are horizontally arranged downwards and provided with annular runners, annular sprues with narrow clearances are formed in the annular runners and communicated with a bending pipe forming cavity of the bending pipe shell, the annular runners are communicated with vertical runners through non-linear runners which are horizontally arranged, and a spherical cap mouth communicated with the bending pipe forming cavity of the bending pipe shell is formed in the upper part of the bending pipe shell. By adopting the matching between the non-linear runners which are horizontally arranged and the annular runners having the annular sprues with narrow clearances for completing the conveying and casting of molten steel from the vertical runners to the bending pipe shell, the investment casting mould is simple in structure and convenient to cast, and can be used for effectively solving the problems that the surface quality is poor, the air tightness is poor and the groove part is loose, and improving the casting quality.

A composite desulfurizing agent for iron and steel is prepared from calcium carbonate (10-45 wt.%), fluorspar (2-10 wt.%), lime (10-45 wt.%), carbon-bearing substance (0-10 wt.%) and assistant through low-temp sintering and mixing. Its advantages are high desulfurizing speed and effect and low cost.

The invention provides a pouring stream protecting device for pouring molten steel through a large ladle in continuous casting. The pouring stream protecting device comprises a shell and a channel, wherein the channel is located in the shell and penetrates through the shell, and ladle filler sand and the molten steel can pass through the channel. The channel comprises a connector part, a narrow straight barrel part and a wide straight barrel part, wherein the connector part is used for being matched with an upper nozzle of the large ladle for sealing, and the upper nozzle of the large ladle is sleeved with the connector part; one end of the narrow straight barrel part is communicated with the connector part, and the inner diameter of the narrow straight barrel part is smaller than that of the connector part; the wide straight barrel part is communicated with the other end of the narrow straight barrel part, and the inner diameter of the wide straight barrel part is larger than that of the narrow straight barrel part. Through the pouring stream protecting device, the nature of large-ladle pouring protection can be improved, and the large-ladle pouring protection effect is prominent; besides, the pouring stream protecting device is easy to mount, convenient to use and high in operability.

The invention provides a single-flow-channel secondary combustion oxygen lance capable of improving the scrap ratio of a converter and an application method of the single-flow-channel secondary combustion oxygen lance. The single-flow-channel secondary combustion oxygen lance comprises a lance body and a spraying nozzle, wherein the lance body comprises a three-layered steel pipe structure composed of a middle pipeline, a middle circumferential seam and a peripheral pipeline; oxygen is introduced into the middle pipeline; cooling water is introduced into the middle circumferential seam; returned water flows out from the peripheral pipeline; a main oxygen spraying hole is formed in an end face of the spraying nozzle; a secondary oxygen spraying hole is formed in a side wall of the sprayingnozzle; the flow of the secondary oxygen spraying hole accounts for 15 to 30 percent of the total oxygen supply flow; the flow of the main oxygen spraying hole accounts for 70 to 85 percent of the total oxygen supply flow. According to the single-flow-channel secondary combustion oxygen lance provided by the invention, the design of the main oxygen spraying hole of the oxygen lance is consistent with that of a conventional traditional oxygen lance; the secondary oxygen spraying hole is formed on the basis of an original spraying nozzle, so that oxygen jet flow sprayed out from the secondary oxygen spraying hole and carbon monoxide in the converter are combusted to generate a lot of heat for heating molten steel under the condition that the jet flow of the secondary oxygen spraying hole andjet flow of the main oxygen spraying hole do not have an entrainment phenomenon and a furnace lining of the converter is not corroded, and the scrap ratio of the converter is improved.

The invention discloses a large-plate-blank carbon-free and silicon-free baking-free long water gap, which consists of a long water gap substrate and an inner liner, wherein the long water gap substrate consists of a zirconium carbon outer layer and an aluminum carbon inner layer, the zirconium carbon outer layer consists of following substances in parts by weight: 70 to 80 parts of zirconium, 12 to 14 parts of C (carbon) and 2 to 4 parts of CaO (calcium oxide), the aluminum carbon inner layer consists of the following substances in parts by weight: 60 to 80 parts of Al2O3 (aluminum oxide) and 10 to 30 parts of C, and the inner liner consists of the following ingredients in parts by weight: 74 to 76 parts of aluminum magnesium spinel, 14 to 16 parts of anti-explosion fiber and 8 to 10 parts of phenolic resin. Through the use of the baking-free long water gap for large-plate-blank continuous casing low-carbon and low-silicon steel, impurity pollution and steel blank carbon increase and silicon increase phenomena caused by secondary oxidization of large-ladle molten steel and molten steel sputtering can be prevented, the continuous casting efficiency can be continuously improved, the continuous casting blank quality is ensured, and more economic benefits are created for enterprises.

The invention relates to the technical field of cables, especially to a super high-temperature resistant mobile cable for buggy ladle. The technical problem of the invention is as follows: during theuse process of the buggy ladle, due to the over-high temperature of molten steel, steel slag and the like, cables on a motor of the buggy ladle are often scalded; and due to high power of the motor, the cables bear considerable tensile force, and the cables will be broken in the long run. The super high-temperature resistant mobile cable for buggy ladle includes a pilot conductor and multiple power conductors. The multiple power conductors are wound on the outer side of the pilot conductor, and the multiple power conductors are equally-spaced in a circle. The pilot conductor and the multiple power conductors are externally coated with an insulating layer, which is coated with a filler. The cable of the invention has strong high temperature resistance, and can be entirely reinforced by using multiple tensile wires and a tensile layer to enhance tensile strength of the cable and effectively prolong service life of the cable. The cable of the invention has wide market promotion prospects.

The invention discloses a combined type pocket block based on an electromagnetic induction heating tapping technology. The combined type pocket block comprises an upper pocket block body and a lower pocket block body; an induction coil is poured and packaged in the lower pocket block body; an induction coil lead wire is led out of the bottom of the lower pocket block body, penetrates through a steel ladle bottom case and is connected with an induction heating power supply; the upper pocket block body is stacked at the top of the lower pocket block body; the upper pocket block body is in located connection with the lower pocket block body through a bulge and groove structure on the contact surface; an upper molten steel channel is formed in the upper pocket block body, and is of a frustum cone-shaped structure; the minor diameter end of the upper molten steel channel faces downwards; the height of the upper molten steel channel is less than or equal the height of a Fe-C alloy fusion layer; a lower molten steel channel is formed in the lower pocket block body; the lower molten steel channel is of a cylindrical structure and communicates with the upper molten steel channel; and the diameter of the lower molten steel channel is equal to that of the minor diameter end of the upper molten steel channel. Duty-cycle operation of the induction coil is achieved, the sizes of the molten steel channels are optimized, and the 100% automatic pouring rate is ensured.

The invention relates to the technical field of steelmaking, in particular to a converter smelting method which comprises the steps that molten iron is subjected to converter smelting, and bottom blowing is conducted on the molten iron under the atmosphere of inert gas and carbon dioxide; wherein the flow of the inert gas and the bottom blowing time meet a first quadratic function relationship; the flow of the carbon dioxide and the bottom blowing time meet a second quadratic function relation, the flow of different gases in the bottom blowing mixed gas is changed along with the smelting progress in each ton of molten steel, and the flow of the carbon dioxide is controlled to be high in the middle stage of bottom blowing, so that high T.Fe can be guaranteed, slagging and dephosphorization are facilitated, and the dephosphorization efficiency is improved; in the later stage of bottom blowing, the oxidability of bottom blowing gas is reduced, and T.Fe is used for reducing the iron content (T.Fe) in slag and the end-point oxidability of molten steel.

The invention relates to a method for treating various steel slags by a tipping hot disintegration process, which belongs to the technical field of steel slag treatment and comprises a tipping deslagging stage and a hot disintegration stage. The tipping slag pouring stage comprises the steps that liquid molten steel slag and semi-solid steel slag in a steelmaking workshop are conveyed to a steel slag hot disintegration treatment workshop and mixed in a slag bed after being poured through a tipping car, a dust collection cover is arranged above the slag bed, and a closed space is formed by the dust collection cover and the slag bed; the hot disintegration stage comprises the following steps: starting a spraying facility arranged around a slag bed, spraying cold water by the spraying facility to cool various mixed steel slag, carrying out pulverization reaction on the steel slag when the steel slag meets the cold water, and repeatedly spraying the cold water until the steel slag is stable after being pulverized; the device and the method have the advantages that the device and the method are suitable for various enterprises with different steel slag yields and various steel slag types, the steel slag treatment efficiency is guaranteed, and the environment-friendly requirement is met.

The invention relates to innovation applied to a directional crystallization technology, in particular to an automatic production system for directional crystallization, which comprises a medium-frequency holding furnace equal molten steel splitting device and a directional crystallization cooling disc, and the medium-frequency holding furnace equal molten steel splitting device is arranged above the directional crystallization cooling disc; the molten steel equally-dividing device of the medium-frequency heat preservation furnace comprises a crucible, an induction coil, a sand layer and a furnace shell, the sand layer is arranged on the outer wall of the crucible, the induction coil is arranged on the outer wall of the sand layer, the furnace shell is arranged on the outer wall of the induction coil, a bottom plate is arranged at the bottom of the crucible, a first liquid outlet hole is formed in the bottom of the crucible and penetrates through the bottom of the crucible and the bottom plate, and a second liquid outlet hole is formed in the bottom of the crucible. The device further comprises a liquid waiting disc, a tray and a rotating shaft. The directional crystallization cooling disc comprises a bracket, a roller is arranged on the bracket, a hollow barrel-shaped cooling disc is arranged above the bracket, and the cooling disc is in running fit with the roller; and after quantitative molten steel casting is automatically carried out on the die through the second liquid outlet hole, rapid directional cooling is carried out through the directional crystallization cooling disc, and automatic production of quantitative crystallization is achieved.