12 results about "Semi-steel" patented technology

The invention relates to the technical field of iron and steel smelting, in particular to an efficient semi-steel desulfurization method which comprises the following steps: performing rotary injection stirring desulfurization treatment on semi-steel; in the desulfurization treatment process, desulfurized alloy and passivated lime are adopted as desulfurizers; the desulfurized alloy and the passivated lime are injected into the semi-steel in different channels and different positions for desulfurization; and the desulfurization alloy is an MgAlCa alloy. According to the efficient desulfurization method for the semi-steel, the sulfur content in the semi-steel can be effectively reduced, and production of ultra-low sulfur steel is supported.

The invention discloses a semi-steel steelmaking method for SPA-H weathering resistant steel using roughing slag for slagging, which comprises the following steps of: smelting semi-steel in a converter, and adding the roughing slag of a steelmaking furnace as a slagging material for slagging in the blowing process; the roughing slag of the steel smelting furnace is added in two batches, the first batch of roughing slag is added from the blowing oxygen step to 40%-50%, and the adding amount is 70%-80% of the total mass; the adding time of the second batch is from the blowing oxygen step to 60%-70%, and the adding amount is 20%-30% of the total mass; in the blowing process, the lance position of an oxygen lance is controlled in a high-low-low mode, the lance position in the early stage of the oxygen blowing process is 1.7-1.8 m, the lance position in the middle stage of the oxygen blowing process is 1.55-1.65 m, and the lance position in the later stage of the oxygen blowing process is 1.4-1.45 m. The method can safely and stably use the tapping slag in the steelmaking process, controls the dephosphorization rate in a suitable range, realizes cyclic utilization of the tapping slag of the steelmaking furnace in the steelmaking process, avoids resource waste, reduces the steelmaking production cost, and has the characteristics of good safety, low cost, energy conservation and environmental protection.

The invention relates to the technical field of welding of semi-steel cables, in particular to an induction welding tool for a semi-steel cable and a welding method of the induction welding tool, and the welding tool comprises a coaxial positioning mechanism, an induction welding mechanism, a data acquisition assembly, an end face inclination angle judgment module, a coaxiality detection module, an eccentric torque correction module and a welding quality detection module; the method comprises the following steps: determining whether the fitting end surface has angular inclination or not based on a circumferential pressure balance index; under the condition that angular inclination exists, whether the coaxiality is qualified or not is determined based on the horizontal distance between the clamping groove and the vertical center line of the counter bore; whether the gravity eccentric torque of the semi-steel workpiece is qualified or not is determined based on the bending deflection amount of the semi-steel workpiece, and the righting distance of the righting block is adjusted based on the unqualified condition; and the tail pipe and the semi-steel workpiece are welded, and whether the welding quality is qualified or not is determined based on the circumferential spreading uniformity of the metallurgical bonding layer so as to optimize the preset equilibrium index. The welding quality of the tail pipe and the semi-steel workpiece is improved.

The invention relates to the technical field of converter semisteel smelting, in particular to a converter semisteel smelting molten iron tank sticking treatment system which comprises a supporting platform and a molten iron tank, the molten iron tank is placed in the center of the front side of the upper end of the supporting platform, a protection assembly is arranged on the outer side of the molten iron tank, and a converter assembly is installed above a second cushion block and a first cushion block. Through cooperation of a converter, a heavy hydraulic motor and a molten iron tank, molten iron is loaded into the converter according to the residual tank capacity of the molten iron tank, blowing is conducted for 3-5 minutes, 8 kg / t of magnesium balls and 30 kg / t of lime are added during blowing, the tapping temperature is controlled to range from 1500 DEG C to 1560 DEG C, semi-steel stops flowing in the molten iron tank for 0.5-1 hour, then iron is added into the converter, sticking substances on the wall of the molten iron slag tank are removed through multiple times of melting-scouring circulation, and the molten iron slag tank is obtained. The problem of insufficient volume caused by tank sticking is solved, and normal operation of smelting equipment is guaranteed.

The invention discloses a steelmaking slag former produced by using iron-containing dust and a use method thereof, and aims to solve the problems of low utilization rate of iron-containing dust in iron and steel enterprises, difficulty in slagging in low-silicon molten iron / semi-steel steelmaking, poor dephosphorization effect and the like. The steelmaking slag former is prepared by uniformly mixing iron-containing dust and mud with limestone powder or lime powder according to a ratio, directly feeding the mixture into a kiln or roasting the mixture at 800-1250 DEG C in a ball-pressing manner, and ingredients containing SiO2 or SiO2 and Al2O3 can be added as required. Iron resources and various beneficial components in the iron-containing dust sludge are fully utilized, the low-melting-point pre-melting slag former is formed after roasting, the slag former has the advantages of being high in slag forming speed, good in dephosphorization effect, small in converter blowing temperature drop and the like, metallurgical lime can be partially or completely replaced, and the slag former is suitable for different blowing scenes such as normal molten iron, low-silicon molten iron and semisteel; and the additional value of the iron-containing dust mud is remarkably improved, the smelting cost is reduced, the metal loss and splashing phenomena are reduced, and good industrial application value is achieved.

The invention discloses a method for preparing high-purity pig iron based on vanadium-containing molten iron two-step converter smelting, and belongs to the technical field of ferrous metallurgy. The method comprises the following steps: injecting vanadium-containing molten iron with specific components into a converter, and sequentially carrying out first-step blowing vanadium extraction and second-step blowing dephosphorization; in the vanadium extraction stage, the oxygen blowing strength is controlled to be 2.5-3.5 Nm / (min.ton), the final temperature is 1350-1380 DEG C, semisteel with V smaller than or equal to 0.05% is obtained, and vanadium slag with V larger than or equal to 12% is recycled; in the dephosphorization stage, 15-25 kg / ton of a lime-based dephosphorization agent is added, the oxygen blowing strength is controlled to be 1.5-2.5 Nm / (min.ton), the final temperature is 1320-1350 DEG C, and P is smaller than or equal to 0.015%; then the semi-steel is transferred into an LF furnace for deep desulfurization until S is smaller than or equal to 0.015%, and the content of C and Si is adjusted; and finally, the C1 / C2-grade high-purity pig iron meeting GB / T 718-2024 is obtained through casting. The method realizes efficient recovery of vanadium resources and low-cost preparation of high-purity pig iron, and is compact in process, low in energy consumption and suitable for industrial application.

The application discloses a vanadium element extraction method in low-silicon high-chromium molten iron, and relates to the field of blast furnace ironmaking.The method solves the problems of high cost and low extraction efficiency of the existing vanadium element extraction method in low-silicon high-chromium molten iron.The vanadium element extraction method comprises the following steps: S1, providing low-silicon high-chromium molten iron, a cooling agent and a slag adjusting agent;S2, adding the cooling agent and the low-silicon high-chromium molten iron into a converter respectively to perform first mixing, and obtaining a first mixture;S3, igniting the converter, adding the slag adjusting agent into the first mixture to perform second mixing, and then performing blowing and smelting to obtain a second mixture;S4, after the blowing and smelting are completed, tilting the converter to discharge semi-steel in the second mixture, pouring the semi-steel into a semi-steel ladle, and leaving vanadium slag remaining in the converter;S5, repeating steps S3 and S4 for a preset number of times, and then pouring all the vanadium slag remaining in the converter into a vanadium slag tank to obtain finished vanadium slag.The method has low cost and high extraction efficiency.

The utility model discloses a semi-steel tread cloth liner finishing device, which relates to the technical field of tread cloth liner finishing devices, and comprises a base, a support frame is arranged on the base, and the base is provided with a cloth liner rolling assembly, a rough deviation rectifying assembly, a fine deviation rectifying assembly and a rolling assembly used for collecting cloth liners. The rough deviation rectifying assembly and the rolling assembly are located at the two ends of the base, the cloth liner roll assembly and the fine deviation rectifying assembly are arranged between the rough deviation rectifying assembly and the rolling assembly, the fine deviation rectifying assembly is arranged at the top end of the supporting frame, and the rolling wheel assembly is arranged at the bottom end of the base. According to the utility model, through the mutual cooperation of the rough deviation rectifying assembly and the fine deviation rectifying assembly, the left-right deviation of the cloth liner roll can be effectively rectified, so that the rolling tension fluctuation of the cloth liner roll is avoided in the tread production process, and the tread rubber stability is ensured.

The application relates to the field of steel smelting, in particular to a preparation method of low-phosphorus low-sulfur high-manganese steel; the method comprises the following steps: carrying out desulfurization treatment on molten iron with a preset sulfur content to obtain desulfurized molten iron; carrying out dephosphorization treatment on the desulfurized molten iron with a first preset phosphorus content to obtain dephosphorized semi-steel; carrying out decarburization and dephosphorization smelting on the dephosphorized semi-steel with a second preset phosphorus content to obtain manganese-containing steel liquid; carrying out refining on the manganese-containing steel liquid, then carrying out vacuum degassing treatment, and then carrying out pouring to obtain low-phosphorus low-sulfur high-manganese steel billets; wherein, the first manganese raw material is added in the decarburization and dephosphorization smelting process, and the second manganese raw material is added in the refining process; the desulfurized molten iron is subjected to dephosphorization treatment, decarburization and dephosphorization treatment, desulfurization treatment and degassing treatment, the first manganese raw material and the second manganese raw material are added in the decarburization and dephosphorization smelting process and the desulfurization process respectively, the phosphorus content of the first manganese raw material and the second manganese raw material is limited, the sulfur content in the steel liquid is removed in the desulfurization process, and the low-phosphorus and low-sulfur content targets of the high-manganese steel are achieved.

This invention discloses a smelting method for using waste bricks from aluminum electrolytic cells as a heating and fluxing agent in converter semi-steel smelting. The method involves adding waste brick particles from aluminum electrolytic cells with a SiC mass fraction ≥60% to the converter before or during the early blowing stage. The amount of waste bricks added, the oxygen lance height, the oxygen supply intensity, and the addition method are precisely controlled according to the initial carbon content. The waste bricks used are primarily composed of silicon carbide (SiC), supplemented with small amounts of Si3N4, Na2SiO3, and NaF. The exothermic oxidation of these bricks provides chemical heat to the molten pool, and the reaction product SiO2 effectively improves slag fluidity. This invention effectively consumes the waste bricks from aluminum electrolytic cells while solving problems such as insufficient heat and poor fluidity in semi-steel smelting. Using this method, the consumption of heating agent can be reduced by 1-5 kg ​​per ton of steel, flux consumption by 1-3 kg, slag formation time shortened by more than 10%, and dephosphorization rate increased by more than 2%, achieving high-value-added resource utilization of industrial solid hazardous waste and optimization of semi-steel smelting processes.

The present application relates to a kind of semi-steel desulphurization method, the method includes the following steps: desulfurizer is injected into molten iron and carries out first mechanical mixing, after injection, second mechanical mixing is carried out, and semi-steel after desulphurization is obtained by slagging;The rotating speed of the first mechanical mixing is 20-30r / min;The rotating speed of the second mechanical mixing is 80-100r / min.The semi-steel desulphurization method provided by the present application, by combining KR desulphurization method and injection desulphurization method, reasonable mechanical mixing and injection process parameters are matched, while the relative position relationship of injection device and stirrer is strictly controlled, can shorten desulphurization processing time, reduce molten iron temperature drop, while the target desulphurization rate of semi-steel can be met.

The invention discloses a new energy automobile hub shaft finish machining process which comprises the following steps: A, casting: firstly carrying out casting mold design, finely presenting the shape and the size of a hub shaft, then coating the inner wall of a casting mold with a release agent by using a mold, finally pouring molten raw materials into the casting mold, cooling and taking out to obtain a hub shaft blank; b, blank manufacturing, wherein the hub shaft blank is subjected to heat treatment, deburring, chamfering and grinding treatment, and a hub shaft is obtained; and C, turning machining is conducted, specifically, according to the hardness condition of the hub shaft, a high-precision lathe is adopted for high-speed turning and semi-steel turning machining. The raw materials comprise the steel powder, the iron powder, the nickel powder, the chromium powder, the carbon powder, the silicon powder, the manganese powder, the phosphorus powder and the copper powder, the overall strength of the obtained hub shaft can be effectively improved, the protective paint is sprayed on the surface of the hub shaft, the overall anti-static property, high temperature resistance, corrosion resistance and abrasion resistance of the hub shaft can be effectively improved, and therefore the service life of the hub shaft is effectively prolonged.