38results about How to "Conducive to smelting" patented technology

Provided are acid-corrosion-resistant high-strength low-nickel duplex stainless steel and a manufacturing method thereof. The duplex stainless steel comprises the chemical components by the weight percentage: 0.01-0.06% of C, 0.20-0.50% of Si, 3.0-3.8% of Mn, 21.0-22.0% of Cr, 1.0-1.5% of Ni, 0.15-0.20% of N, 0.40-0.60% of Mo, 2.0-3.0% of Cu, less than or equal to 0.05% of Co, less than or equal to 0.01% of Sn, less than or equal to 0.01% of Pb, less than or equal to 0.5% of the total amount of W, B, Nb, Ti, Co, Al and V, and the balance Fe and inevitable impurities, wherein the ratio of Cu% to Mo% is 5 to 1. The duplex stainless steel has pitting corrosion resistance equivalent to that of S32101 and has acid corrosion resistance superior to that of the S32101, the corrosion resistance in boric acid and other acidic conditions is further improved, the risk of corrosion occurrence is reduced, and the yield strength is increased by 20% or more than that of the conventional S32101; the alloy cost is equivalent to that of the S32101; and ordinary raw materials can be used for smelting products satisfying nuclear power material standards.

The invention relates to a low carbon low silicon-aluminum killed steel converter refining production process. Converter slag-making materials are added in two batches, and the steel tapping temperature of a converter is controlled between 1640 DEG C-1660 DEG C; in the blowing process, the lance position is controlled as low-high-low-high, and meanwhile it is guaranteed that the catch carbon time is larger than or equal to 2 minutes; after steel tapping of the converter is completed, a steel ladle is refined, then an argon bottom blowing flexible pipe is connected, strong argon blowing is adopted, when the steel liquid surface surges, the argon blowing flow is adjusted to be lower, and it is guaranteed that molten steel does not overflow the steel ladle; for the slag-making stage, the slag-making material are added for two times, after the slag-making materials are added, argon bottom blowing strong stirring is adopted, the argon blowing time is 3 min-10 min, and the slag sample taking frequency is 4-5 times; and when top slag is turned from original black to green, argon bottom blowing stirring is stopped, then steel liquid temperature measurement and sampling are conducted, and after steel liquid temperature measurement and sampling, the argon bottom blowing flow is adjusted to the weak blowing state. The production process is beneficial to smelting less slag of the converter, increasing the age of the converter, reducing consumption of refractory materials, reducing the oxygen content of molten steel of steel tapping in converter, increasing the ratio of scrap steel, and reducing production cost.

The invention relates to a premelting composite slugging agent for a converter and a preparation method thereof. The slugging agent comprises raw materials of lime, ferric oxide powder, activated aluminum oxide powder, low-sulfur cement, silica powder and an activating agent, wherein the raw materials comprise the following components in percentage by mass: 15-35% of CaO, 15-35% of Fe2O3, 5-15% ofAl2O3, 5-15% of MgO, and not greater than 15% of SiO; and the slugging agent contains not greater than 0.25% of impurity element S. According to the slugging agent, the raw materials are environmentally friendly; the melting point is low; the slagging speed is high; the breathability of slags can be obviously improved; the splashing in the converting process is reduced; and meanwhile, the slugging effect in the converting process can be effectively improved through the slugging agent, and the converting process is stable; the slugging agent avoids re-drying and gun adhering; in addition, theend point oxygen of a converter can be decreased after the converting slugging effect is improved, so that the oxidization of the slags can be reduced; the steel iron consumption is decreased; and theproduction cost is reduced.

The invention relates to a converter smelting control method based on slag composition prediction. The control method includes the following steps that 1, establishment and maintenance of a steel typeslag composition standard are carried out; 2, establishment and maintenance of an intermediate deslagging steel type distinguishing are carried out; 3, a heat state detection module detects the heatproduction state; 4, slag quantity and composition calculation is carried out; 5, model calculation and corresponding control are carried out; 6, slag quantity and composition calculation is stopped;the step 3 is repeatedly executed; 7, intermediate deslagging control is carried out; 8, blowing operation is stopped; 9, a communication control module downloads control instructions to a PLC controlmodule; 10, the PLC control module performs corresponding operation control; the step 3 is repeatedly executed; and 11, operation is ended. By means of the technical scheme, related equipment does not need to be additionally arranged, and the real-time slag composition and weight are calculated by calculating the contents of various components contained in the molten steel slag quickly and accurately in real time.

The invention relates to a calcium oxide material for clean steel smelting and a preparation method thereof. The technical scheme is as follows: the preparation method comprises the following steps: mixing 35-40 wt% of limestone particle, 30-35 wt% of limestone fine powder, 8-22 wt% of magnesium aluminum sol and 5-20 wt% of mixture, stirring uniformly, and painting or casting to form, thereby obtaining the calcium oxide material for clean steel smelting. The mixture is formed by mixing alumina micropowder, magnesite fine powder and calcium lignosulphonate in a mass ratio of 10:(3-5):(0.7-1.5); the particle size of the limestone particle is 7-0.1mm, the particle size of the limestone fine powder is 0.05-100 mu m, and the CaCO3 content of the limestone particle and limestone fine powder is greater than or equal to 92 wt%; and the mole ratio of magnesium to aluminum in the magnesium aluminum sol is 1:(0.4-2.2). The calcium oxide material has the advantages of low impurity content, proper strength and almost no influence on total oxygen content of molten steel, can adsorb oxide inclusions in the steel, and is suitable for preparing the working line of a tundish for clean steel smelting.

The invention relates to a clean steel-refining slagging method. The clean steel-refining slagging method includes the following steps in sequence: (I) converter end point control: the converter end point oxygen content is more than or equal to 600ppm, ferro-aluminium which is more than or equal to 2.0kg per ton steel is added in a steel ladle along with steel flow in the tapping process of a converter, and the amount of slag tapped from the converter is less than or equal to 9kg per ton steel; (II) in the refining process of the converter or a ladle furnace (LF), more than or equal to 3kg per ton steel of high alumina slag with Al2O3 with mass percentage being equal to or more than 70 percent is added, lime, the total amount of which is 6kg to 7kg per ton steel, is added, and fluorite which is less than or equal to 1.5kg per ton steel is added; (III) in the ladle furnace process, agitation is carried out with argon flow being 500Nl/min or more than 500Nl/min for 5 minutes or more than 5 minutes, and afterwards, the out furnace time is more than or equal to 15 minutes; and the weight percentage of the refining final slag is as follows: 35 to 40 percent of Al2O3, 41 to 45 percent of CaO and 6 percent or less of SiO2. The melting point of the target slag system of the clean steel-refining slagging method is low, and the usage amount of fluorite is less.

The invention relates to an environment-friendly water-based large fabric for converter fettling. The fabric comprises the following components in parts by weight: 80-90 parts of magnesia, 6-10 partsof binding agent, 0.5-1 part of slaked lime and 0.5-1 part of bentonite. The preparation method comprises the steps: adding water into the supplementary material, stirring to form porridge, pouring the stirred material into a position needing to be repaired in the converter, burning for 15-25 minutes at 800-1350 DEG C, and finishing the repair when the supplementary material is large and the surface material turns red. Compared with a common converter large-area fettling material, the sintering time is shortened by about 30 minutes; during sintering, no smoke, no odor and no harmful volatile matter exist, and no harm is caused to human bodies and the environment; and during sintering, gunning operation can be carried out so that the steelmaking efficiency is improved.

The invention provides a temperature measurement sampling robot process arrangement and operation process for steelmaking production refining treatment. According to the method, a robot walking trackparallel to a buggy ladle track, a robot body, a temperature measurement sampling gun, a probe storage rack, a paper tube scraper and a steel sample stripping device are arranged on a main operation platform, the robot moves on the walking rail and can reach a plurality of stations, and the molten steel temperature measurement, molten steel sampling, paper tube probe insertion, paper tube probe scraping and other operations are completed at different stations. According to the present invention, the industrial robot is used for replacing the manual work for temperature measurement and sampling, operators are prevented from being scalded by the splashing of steel slag, meanwhile, the robot is used for automatic temperature measurement and sampling. The stability and consistency of the detection data are kept by controlling the consistency of the depth and position of a measuring point under the molten steel level, so that the process is an advanced technology for guaranteeing the quality of steel products.

The invention relates to a method for smelting medium-low carbon ferromanganese, which is characterized in that the smelting cost of the medium-low carbon ferromanganese is further reduced by setting a blast furnace-converter process, and the smelting cost of the medium-low carbon ferromanganese is further reduced by mixing and blowing carbon dioxide and oxygen in different proportions in multiple directions in the converter process. The corrosion to equipment in the converter smelting process is reduced to the minimum, meanwhile, the volatilization loss of manganese is reduced, and the quality of a final product is guaranteed.

The invention relates to a green energy saving electric arc furnace controlling device, which can lead that the electric arc furnace has little influence on a power system, can increase production efficiency of the electric arc furnace and reduces unit consumption. The device has the technical proposal that the green energy saving electric arc furnace controlling device is characterized in that the device is also provided with a switch transformer, a main control unit circuit and a phase-control trigger element circuit; the beginning terminal of the primary side winding of the switch transformer is connected with a power supply by a breaker while the end is connected with the corresponding tap of an arc furnace transformer; two ends of the secondary side winding of the switch transformer are connected with thyristors which are positive and negative in parallel connection. The main control unit circuit and the signal input end of the phase-control trigger element circuit are connected with a current transformator, a pressure transformator. The given input end of the phase-control triggers element circuit is connected with the output end of the main control unit circuit output. The output end of the phase-control trigger element circuit is connected with the control end of the thyristors.