Zhengzhou yaojuxiang industry and Trade Co., Ltd

First, how to improve the absorption of calcium in the steelmaking process and the principle and characteristics of calcium treatment of steel water: 1, solid core metal calcium core core line production process: pure calcium rod, preheating furnace, extruder, fan cooling, with steel placement, bag rod machine, rewinder, next plate packaging 2, metal calcium on the clean steel water inclusions of denaturetreatment treatment, change the composition of steel water, is the smelting process of the regular process of smelting. 3, stabilize the calcium content in steel water, reduce the cost of feeding calcium lines, better applicable to smelting refined steel products, reduce costs, is the goal that all steel enterprises have been looking for. My company compound pure calcium line processing process, to meet this requirement. The metallurgical basic characteristics of calcium melt ingress at 850 degrees C, boiling point 1480 degrees C, density 1.55g/cm3, melting in steel water close to zero, There is a greater affinity for oxygen, and liquid calcium can dissolve Al2O3. Al2O3 in steel water is processed with calcium to form a large grain of liquid inclusion, which is easier to float. The water port blockage caused by the excessive al2O3 in steel water is reduced, and the waterability of steel water is improved. After calcium treatment, Al2O3 inclusions remain spherical and improve the performance of rolling. 4, calcium added to the steel water, part dissolved to the steel liquid, become dissolved calcium in steel, part of the form of steam volatile, part of the steel Al2O3 inclusions or S and other reactions to form impurities, in the process of refining, casting such impurities floating into the slag, the residual part remains in the steel to become a inclusion. Denaturetreatment treatment of inclusions: Al2O3 becomes CaO-Al2O3 or CaO-Al2O3-CaS; CaS becomes CaO-Al2O3-CaS. The fluidity of steel water can be effectively changed. Save the use of alloys and other deoxygenation, desulfurization, and save smelting costs. The condition of inclusions in steel water is related to the amount of calcium added, the time of addition, and the speed of addition. Second, the composite pure calcium line to add a variety of requirements: 1, seamless calcium line speed: not suitable feeding line speed, low calcium absorption rate, calcium is evaporated; 2, seamless pure calcium first time: after feeding the calcium line, immediately sampling, the impurities in the steel change significantly, the vast majority of the transformation into CaO-Al2O3-CaS inclusion, small size, shape close to the spherical, but not complete globalization. In the crystallizer sampling, the vast majority of the inclusions become CaO-Al2O3 inclusion, spherical, CaS content is low. 3, CaO, Al2O3, CaS, CaS, Ca are lower than when just feeding the line, sampling in the billet, the inclusions change, and become CaO-Al2O3-CaS inclusion, shape is no longer spherical, the size is slightly larger than the crystallizer, because the steel solidification S bias, and calcium reaction to generate CaS, with the polymer, size increase. Al and O reactions in steel water, inclusions and it's swelled. 4, feed calcium: feeding line (CaSi line) amount to form 12CaO7 Al2O3 at the same time to consider the loss, generally believed that after feeding the steel residual calcium content of 30-40 ppm. 5, with silicon calcium line, calcium line, aluminum calcium line, pure calcium line calcium denatured treatment will also be very different. The calcium residue content in steel water is also an important indicator of calcium treatment in steel water, when the aluminum quality score is 0.02-0.05%, the treatment is to obtain liquid inclusions, residual calcium mass score in 29ppm, Ca/Al is 0.058-0.145, test results It is shown that W(Ca)/W(Al): 0.13-0.20 is good, and the general silicon calcium line is used in 0.9 kg/tonne steel. Third, feeding into the compound pure calcium line after the composition of inclusions and steel S, O content: 1, steel S s 10 x 10-4%: CaO-Al2O3-CaS or CaO-Al2O3-CaS-MgO formed in steel. CaS forms in steel when s is 30 x 10-4% 2, the original O content in the steel is high, then Ca and O formed CaO, feeding line should be selected at the end of the de-O treatment. Ordinary calcium lines can only be fed to a certain depth under the surface of the steel liquid. My company's composite pure calcium line can reach the bottom of steel water. Fourth, the advantages of pure calcium line: 1, long storage time (long-term storage of calcium does not fail) more accurate, more stable calcium content (52g/m) 2, high recovery rate (the same treatment effect when consuming less calcium) 3, high reproducibility (small residual calcium fluctuations) less adsorption of harmful gases (H, N, etc.) in the feeding process brought in less impurities, the more conducive to the cleanliness of steel water. V. In the case of different calcium-containing substances added to the steel: 1, calcium treatment in steel water: there is powder spray, surface feeding calcium line, calcium wire, alloy added and so on. 2, calcium line is divided into silicon calcium line, aluminum calcium line, iron calcium line, pure calcium line. My company produces composite pure calcium line using the bottom feeding line treatment. Six, the advantages of the composite pure calcium line: 1, the use of special process welding, so that calcium lines at a certain speed feeding, in close to the bottom of the steel package melting, by the high absorption rate of steel water. 2, the inside of the composite pure calcium line for solid core metal calcium, the composition of 96%, the external aluminum steel belt 08, can ensure that the calcium after feeding the calcium line has a stable calcification. 3, composite pure calcium line does not contain silicon, more suitable for smelting IF steel, SPHC, SPHD and other special steel. Seven, the process operation of the composite pure calcium line: 1, Yaojuxiang steel water calcium treatment methods are: powder treatment, surface feeding into the core line, feeding wire gun deep feeding wire, feeding line process is not easy to produce broken lines 2, ordinary feed wire can be achieved. According to the smelting situation of steel water end and aluminum deoxygenation, the amount of feeding line is determined, and the appropriate aluminum calcium ratio has been reached. Timely adjust the feed wire feed line wheel pressure, to ensure that the feed wire feed machine in the feeding line process does not slip. Make the automatic count of the feed ertous is accurate and reliable in order to master the reliable feed line quantity. Adjust the feeding speed according to the size of the steel package, reduce the turning oxidation of steel water, in order to feed the line smoothly. Eight, composite pure calcium line parameters: Main ingredients: Ca -98% Diameter: 9.0.25mm Added: 0.35-0.4kg/tonne steel Speed: 1.5-2m s 9mm Nine, Zhengzhou Yaojuxiang Industry and Trade Co., Ltd. product introduction: Seamless calcium line model s9 10 seamless composite calcium line AD powder is 10, 15, 20, 25...60AL Aluminum ash is 10, 15, 20, 25...60AL Aluminum grain is 95-99.5AL Aluminum chips 90-97AL Deoxygenator is 10-40AL Aluminium ball is 20-80AL