226results about How to "Shorten the smelting cycle" patented technology

The invention discloses a converter smelting endpoint molten steel carbon and temperature control system and a method thereof, and belongs to the technical field of converter steelmaking automation control. The converter smelting endpoint molten steel carbon and temperature control system comprises hardware equipment and a software processing module, and is characterized in that: the hardware equipment comprises converter sublance measuring equipment and converter exhaust gas analysis equipment; the software processing module comprises a converter production process data acquisition module, a converter smelting endpoint carbon calculation module, a converter smelting endpoint temperature calculation module, and an information display module; the software processing module is operated on a computer; and the hardware equipment and the software module are connected with a converter production process database through an Ethernet to realize data interaction. The control system and the method thereof have the advantages of accurately controlling the converter smelting endpoint molten steel carbon content and the molten steel temperature, along with stable operation, cost conservation, and wide application range.

The invention belongs to the technical field of electric arc furnace steelmaking and particularly relates to a full-steel-scrap electric arc furnace cleanness rapid smelting method which is applicable to the 30-300t full-steel-scrap electric arc furnace smelting process. According to the full-steel-scrap electric arc furnace smelting process, spray guns buried in refractory materials on the side faces of the furnace bottom of an electric arc furnace are used for blowing different types of media at different smelting stages; at the stage of recarburization and melting acceleration, melting-down of a molten pool is accelerated through carburization, and the carbon content of the molten pool is increased. At the stage of high-efficiency dephosphorization and deep denitrification, molten pool reaction is intensified to conduct high-efficiency dephosphorization and deep denitrification. Accordingly, the smelting rhythm of the full-steel-scrap electric arc furnace is accelerated, the dephosphorization and denitrification effects are improved, the cleanness of molten steel is improved, and full-steel-scrap electric arc furnace cleanness rapid smelting is realized.

The invention discloses a rapid desulfurization refining method for a ladle furnace (LF). The method comprises the following steps of: 1) performing desulfurization refining in the LF, wherein the LF treatment starting temperature is between 1,570 and 1,605 DEG C; 2) after a ladle argon blowing device of the LF is turned on, blowing argon from the bottom of the ladle; 3) after finishing adjusting the temperature, inserting a desulfurization powder spraying gun into a molten steel liquid for spraying a desulfurizing agent; 4) after finishing spraying powder, switching the spraying gun to a functional stage of blowing the argon, blowing the argon from the top, simultaneously blowing the argon from the bottom of the ladle, and performing strong stirring desulfurization operation; 5) alloying, namely after desulfurization is finished, lifting the desulfurization powder spraying gun, adjusting a ladle bottom blowing flow, and performing alloy configuration to meet a target requirement on final components of a steel grade; and 6) after finishing adjusting components, performing soft stirring operation, measuring the temperature, sampling, and turning off the ladle argon blowing device to finish treating. The method realizes rapid desulfurization of the LF, and can shorten an overall melting cycle and improve the number of continuous casting furnaces and production efficiency.

The invention discloses a total-converting steelmaking method of an electric furnace. The method achieves the purposes of energy saving and consumption reducing through the working procedures containing adjustment for ratio of raw materials and strict control for the converting process. The method specifically comprises the following steps of: controlling the proportion of molten iron to be 71-79 percent; adding steel scraps through a furnace mouth for one time, and adding the molten iron through an iron exchanging mouth for two times; preheating, warming and decarburizing the steel scraps and molten steel in a furnace through a nozzle of an oxygen-burning system 3 installed on a furnace wall; during converting, regulating a corresponding gear according to demands, meanwhile converting with a furnace door oxygen gun, and making the converting efficiency to be maximized; adding slag making materials such as lime into the electric furnace to make slag; and when the molten steel achieves the temperature and components needed by steel grades, carrying out ladle deoxidization for steel tapping. Compared with the general steelmaking method of the electric furnace, the total-converting steelmaking method of the electric furnace has the advantages that electrode heating is cancelled, the consumptions of the electric energy, electrode and steel scrap are greatly reduced, the smelting cost per ton of steel is greatly reduced, the pollution is decreased, meanwhile the contents of harmful elements in the steel are reduced, and the product quality is increased.

The invention discloses a method for controlling carbon and deep desulphurization by a refined-smelting ladle furnace in the production of extreme low carbon steel, pertaining to the technical field of ladle refining. The technology of the invention is that the amount of roughing slag of a converter is controlled and the thickness of the slag is 30 mm to 60mm; the temperature of molten steel in an LF furnace ranges from 1590 DEG C to 1640 DEG C and the content of Al in the steel is equal to 0.05 percent to 0.09 percent; 6 to 12 kg/ton of refining slag with high basicity and 0.4 to 1.0 kg/ton of Al granules are added; the flow of bottom-blowing argon gas is controlled during the rapid deep desulphurization refining process. On the condition that no electrode is available, argon gas with mass flow of 6 to 8NL/ (min question mark t) is adopted for melting slag. After slag melting, the electrode is arranged to control the flow of argon gas to 4.8-6NL/ (min question mark t) and carbon pickup of the molten steel occurs; when the refining is completed, the oxidizability of steel slag (FeO+MnO) is required to be less than or equal to 1.0 percent and the weight percentage of alkalinity of (CaO)/(SiO2) is equal to 5.5 to 8.0. The method of the invention has the advantages of solving the problem of carbon pickup during the refining in the LF furnace and controlling the weight percentage of carbon increment within 0.015 percent, thereby realizing rapid deep desulphurization with the content of sulfur[S] which is less than or equal to 0.0010 percent after desulphurization, and shortening the smelting time of the LF furnace.

The invention discloses a tapping flow control method for full-automatic converter tapping. The method comprises the following steps that (1) the weight G 1 of molten steel in a converter is obtainedthrough calculation; (2) the initial angle Theta 0 of the converter when tapping starts is set based on the weight of the molten steel in the converter, and target tapping flow Q<aim> (t) is set; (3)when the tapping starts, actual tapping flow Q<real> (t) is compared with the target tapping flow the Q<aim> (t) in real time, if the Q<real> (t) is larger than or equal to the Q<aim> (t), the inclination of the converter is reduced, and if the Q<real> (t) is smaller than the Q<aim> (t), the inclination angle of the converter is increased; and in the tapping process, the walking displacement amount xt of a ladle trolley is controlled at the same time, so that the ladle trolley is always located at an impact point of tapping steel flow; and (4) when the condition that the tapping is finished isdetected, the is stopped and the converter is lifted. In addition, the invention further discloses a tapping flow control system for full-automatic converter tapping.

The invention discloses a rare earth adding control method for high-strength rare earth girder steel. The cleanliness of molten steel of rare earth high-strength girder steel and the yield of rare earth in the steel is improved by optimizing the steel-making process. In early-stage rare earth steel research, due to the fact that the key control processes such as a rare earth adding mode, adding time and the like are not completely mastered, the yield of rare earth is low and is about 35%; and meanwhile, the number of rare earth composite inclusions in steel is large, and the continuous castingpourability of a casting machine is poor. In order to increase the yield of the rare earth, the cleanliness of molten steel is guaranteed before the rare earth is added, and the component uniformityof the rare earth in the molten steel is guaranteed after the rare earth is added. Meanwhile, protective pouring is conducted in the casting process of a casting machine, secondary oxidation of the molten steel is prevented, and the yield of the rare earth in the steel can be remarkably increased.

The invention relates to a metallurgic refining flux and preparation method and applications thereof. A compound slagging agent of converter comprises the following components by weight percentage: 20to 50 percent of MnO, 3 to 6 percent of MgO, 5 to 8 percent of CaO, 10 to 15 percent of Fe, 7 to 10 percent of water and the balance of unavoidable impurities. The product has good smelting characteristic, so as to be capable of slagging ahead of time for 1 to 1.5 minutes, shortens the tap-to-tap cycle so as to improve the yield of steel, has good slagging effect in the whole process and almost does not cause splashing, re-drying or slag adhesion on oxygen lance so as to be capable of reducing ferrous charges consumption by 5 to 10 kilograms per ton, increases residual manganese of terminal molten steel by 0.04 to 0.08 percent by using 8 to 14 kilograms of compound slagging agent per ton so as to be capable of saving the alloy of Fe and Mn by 1 to 2 kilograms per ton, eliminates the pollution of fluorinion to environment and water resource, can directly lead to economic benefit in normal conditions according to the results of primary test, and has remarkable social benefit.

The invention relates to a dephosphorizing process of electric furnace steel making, belonging to the field of ferrous metallurgy. The invention provides a dephosphorizing process of electric furnace steel making low cost, comprising a step of slag discharge, and the molten steel temperature is more than 1560 DEG C during the step of slag discharge. Compared with dephosphorizing processes existedin the prior art, the dephosphorizing process disclosed in the invention has no need of adding dephosphorization agent to strengthen dephosphorization, only needs the step of slag discharge once, andthe quantity of slag can be reduced by more than 30%, the smelting cycle can be reduced by more than 5%, thus greatly reducing the cost of dephosphorization in steel-making. The invention provides a novel method for dephosphorization in steel-making, with a wide application prospect.

The invention discloses a production method of low-carbon steel. The production method mainly aims to solve the technical problems that normal pouring of a slab caster cannot be satisfied and the production cost of the low-carbon steel is high because inclusions in the low-carbon steel which is smelted by a converter are difficult to control in the prior art. According to the technical scheme, the production method comprises the following steps of performing convertor smelting, converter low-temperature tapping and deoxidation, performing molten steel treatment at an argon blowing station, and refining molten steel in a refining furnace. The molten steel produced by adopting the production method has high cleanliness, the average content of total oxygen in the molten steel is 16.5 ppm, the average content of phosphorus is 95 ppm, the content of phosphorus as a harmful element in the molten steel is greatly reduced, and the production cost of the molten steel per ton steel is reduced by 13 Yuan.

The invention discloses a method for generating nitrogenous ferrovanadium alloy through utilizing a ferrovanadium electric-arc furnace, and belongs to the technical field of non-ferrous metal metallurgy. The method is characterized in that a single or more nitrogen/argon blowing devices are installed on the furnace bottom or the furnace wall of the ferrovanadium electric-arc furnace with the general nominal capacity of 300-5000kg and can freely blow nitrogen/argon into a ferrovanadium electric-arc furnace hearth, selected raw materials are used, and finally, the nitrogenous ferrovanadium alloy with 45-60% of V, less than 2% of Si and 2-8% of N can be obtained and can be used as a steel additive. Compared with common ferrovanadium, according to the nitrogenous ferrovanadium alloy, the alloy usage can be reduced above 10%, the vanadium yield is increased by 1%, the melting period is shortened by above 30 minutes, the melting power consumption is reduced by 10-15%, and the comprehensive melting cost is lowered by above 2%.

The invention discloses an oxygen blowing control method for dry dedusting explosion suppression of a converter. Multiple stepped climbing three-dimensional curves for controlling the oxygen blowing amount of the converter are established according to different steel types, and parameters of the curves are determined according to actual data of the production environment. The parameters of the curves are recorded in a database, the parameters in the database are corrected at any time according to the data of the actual production environment, and an optimal curve is obtained. Different stepped climbing three-dimensional curves are selected at different blowing stages, and the ascent control function of the oxygen flow at the initial blowing period, the middle blowing period, the rear blowing period and the reblowing stage is satisfied. According to the method, dry dedusting explosion caused by re-gun-discharge after blowing is interrupted can be effectively restrained, stable production of a converter smelting and dry dedusting system is guaranteed, the smelting period is shortened, and production efficiency is improved.

The present invention relates to the technical field of steel-making, and discloses a low-carbon steel for deep drawing and a smelting method thereof. The method comprises: adding desulfurized molten iron into dephosphorization converter and decarbonization converter for duplex smelting; blowing in decarbonization converter and directly tapping, which is tapping without converter deoxidation; carrying out light treatment refining process on the molten steel after tapping to obtain low-carbon steel for deep drawing. The method not only shortens the refining cycle, but also reduces the cost of smelting.

The invention relates to a method for smelting austenite stainless steel by using dephosphorized molten iron. The method comprises the following steps of: (I) melting nickel-base alloy into a pre-solution by using a medium-frequency induction furnace, wherein the mass percentage of Ni in the nickel-base alloy is 4-99.5%, and the mass percentage of P in the nickel-base alloy is not higher than 0.045%; (II) pretreating molten iron so as to provide the dephosphorized molten iron, wherein the mass percentage of C in the dephosphorized molten iron is 2.5-4.0%, and the mass percentage of P in the dephosphorized molten iron is not higher than 0.01%; (III) blending the dephosphorized molten iron and the pre-solution with KOBMS and blowing, wherein the nickel-base alloy melted by the medium-frequency induction furnace and the dephosphorized molten iron are mixed, then are blended into the KOBMS and are subjected to oxygen-blowing decarburization melting in the KOBMS; (IV) carrying out VOD blowing and adjusting ingredients, wherein a VOD carries out blowing according to ingredients of outlet steel of the KOBMS and carries out alloying adjustment according to ingredients of steel types; and (V) carrying out LF refining, wherein an LF adjusts the ingredients and adjusts temperature to a target outbound temperature. The method for smelting the austenite stainless steel by using the dephosphorized molten iron has the advantages that the austenite smelting time of a stainless steel converter is shortened, and the operating efficiency of the stainless steel converter is increased.

The present invention relates to super high power arc furnace smelting technology, and is especially slag regulating agent for super high power large electric furnace. The present invention features that the slag regulating agent consists of C 30-35 wt%, Al 5-7 wt%, MgO 8-10 wt%, Al2O3 10-12 wt%, CaO 20-25 wt%, SiC 9-10 wt% and impurity the rest, and has bulk density of 1.8-2.0 g/cu cm. The slag regulating agent of the present invention can form homogeneous foamed slag continuously in the furnace to reduce FeO, Fe2O3, etc. in the slag layer, raise smelting yield, raise steel alloy yield, raise the heat efficiency of the furnace, lower power consumption, raise the dephosphorization capacity of the furnace and prolong the service life of the furnace.

The invention relates to a method for repairing a converter through waste magnesia carbon bricks. The method comprises the following steps that the to-be-repaired converter is tapped; terminal slag after tapping is directly poured without slag splashing until to-be-used brick fillers are covered with the terminal slag; a pre-calculated amount of brick fillers are added into the to-be-repaired converter, and forms a molten material together with the terminal slag; according to the converter repairing position, the converter is shaken, and thus the molten material can cover the to-be-repaired position; the to-be-repaired converter is sintered for 30 minutes or longer until the terminal slag is solidified; and iron is fed, and next batch of smelting is conducted. According to the method for repairing the converter, the problems of long sintering time, poor converter repairing effect, high converter repairing cost, serious environmental pollution and the like can be effectively solved, byreasonably controlling converter terminal slag, the effect that a mixture of the converter terminal slag remaining in the converter and the waste magnesia carbon bricks is effectively bonded to the repairing position of a converter lining is achieved, and finally the broken converter is repaired.

The invention relates to the technical field of smelting, and in particular to an efficient steel making process method. The method comprises the following steps of feeding a fine material into a furnace; carrying out high scrap ratio and heat balance loading; carrying out a gun and pressure changing oxygen supplying technology; adopting a bomb dropping temperature measuring and carbon determiningtechnology at an end point; and optimizing the steel tapping process, and changing the converter slag pouring process flow. The process method is high in efficiency, low in cost, free of splashing and drying in the process, and stable in blowing.