36results about How to "Purify molten steel" patented technology

The invention discloses a silicon-manganese coal ash deoxidier for steelmaking and a preparation method of the silicon-manganese coal ash deoxidier. The silicon-manganese coal ash deoxidier comprises the following raw materials in parts by weight: 90 to 110 parts of quartz sand, 10 to 15 parts of calcareous shale, 20 to 25 parts of coal ash, 10 to 15 parts of fluorite, 3 to 5 parts of charcoal, 5 to 8 parts of waste aluminum powder, 25 to 30 parts of attapulgite and 10 to 15 parts of black manganese ore. The silicon-manganese coal ash deoxidier has rationality in formula; and the coal ash, the charcoal and the attapulgite are adopted for serving as the raw materials. The deoxidier has good deoxidizing effect; with the adoption of the deoxidier, the contents of nonmetal impurities in the steel can be reduced, the form of the impurities can be changed, the molten steel can be purified, the liquidity of the molten steel can be improved, and the molten steel continuous casting process is smooth; and the continuous casting water ports are out of nodules, thus the continuous casting can be smoothly carried out, the service performance and the service life of steel can be improved and prolonged, and the cost of steelmaking can be reduced.

A method for smelting ultra-advanced duplex stainless steel made of CD3MWN, which is designed for the internal control composition during smelting of duplex stainless steel; wherein C≤0.030 wt%, Si≤0.90 wt%, Mn is 1.20-2.50 wt%, P≤0.020 wt%, S≤0.015 wt%, Cr 26.2-27.5 wt%, Ni 6.2-7.6 wt%, Mo 2.2-3.4 wt%, Cu≤0.80 wt%, W≤0.80 wt%, N 0.32-0.38 wt%, B is 0.0010-0.0100 wt%, Ba is 0.0002-0.0100 wt%, Ce+La is 0.005-0.030 wt%; %Cr+3.3(%Mo+0.5%W)+16%N≥45, precise control of trace The content of elements B, Ba, Ce, and La; increase the N content to more than 0.30%, and at the same time avoid nitrogen pores in the casting; minimize the content of harmful elements such as sulfur, oxygen, hydrogen and other elements, and improve the liquid steel. purity. The poured casting has high strength and excellent corrosion resistance. The ratio of ferrite phase and austenite phase in stainless steel is close to 50%. The service life of the casting is prolonged, the manufacturing cost is greatly reduced, and the goals of energy saving, consumption reduction, and environmental protection are realized.

The invention belongs to the technical field of special steel and smelting, and relates to a method for preparing zirconium-adding high-carbon clean steel through smelting by a vacuum induction furnace. The zirconium-adding high-carbon clean steel is prepared from the following components in percentage by mass: 0.67 to 0.75 percent of C, 0.15 to 0.37 percent of Si, 0.30 to 0.80 percent of Mn, lessthan or equal to 0.012 percent of P, less than or equal to 0.006 percent of S, 0.20 to 0.50 percent of Cr, less than or equal to 0.30 percent of Mo, less than or equal to 0.30 percent of V, 0.002 to0.100 percent of Zr, and the balance Fe and inevitable impurities. The preparation method comprises the following steps of smelting through the vacuum induction furnace, smelting, continuously castingand the like. According to the product prepared through the method provided by the invention, the tensile strength Rm is larger than or equal to 1400MPa, the yield strength R0.2 is larger than or equal to 1300MPa, and when a panel of the product is applied to sintering a saw blade mother plate, the produced plastic deformation damage is less, so that the life is prolonged, and the steel production cost is low.

The invention provides a manufacturing method of steel. The method comprises the following steps: roughly melting molten steel; adding a pre-deoxidizer into a steel ladle in a process from tapping to ladling; and refining the molten steel in an LF (ladle furnace), wherein aluminum is added into the molten steel to perform precipitation and deoxidization in a process of refining the molten steel in the LF furnace; adding the synthesized residues into the ladle to heat; and adding a diffusible deoxidizer into the ladle to perform strengthened deoxidization after the synthesized residues are molten. According to the manufacturing method of steel in the invention, the molten steel can be purified, clogging of a water gap is effectively prevented, and the casting performance of the molten steel is improved. The manufacturing method of steel in the invention is simple, convenient and easy to operate, and has a good application prospect.

The invention discloses a silicon-manganese-calcareous shale deoxidizer and a preparation method thereof. The silicon-manganese-calcareous shale deoxidizer comprises the following raw materials in parts by weight: 40-50 parts of quartz sand, 15-20 parts of black manganese ore, 5-10 parts of celestine, 50-60 parts of limestone, 20-30 parts of calcareous shale, 5-10 parts of scrap iron, 10-20 parts of coal ash, 10-15 parts of vermiculite and 5-10 parts of sepiolite. The silicon-manganese-calcareous shale deoxidizer disclosed by the invention has the advantage that a formula is reasonable and the calcareous shale, the scrap iron, the coal ash, the vermiculite and the sepiolite are adopted as raw materials, so that the deoxidizer has a good deoxidizing effect, the content of nonmetal impurities in steel can be reduced, the forms of the impurities can be changed, molten steel is purified, the liquidity of the molten steel is improved, the continuous casting process of a molten steel blank is smooth, no accretion is generated at a continuous casting nozzle, thus, the smooth casting production is facilitated, the use performance of the steel is improved and the service life of the steel is prolonged; and the steelmaking cost is reduced.

The invention belongs to the technical field of special steel and smelting of the steel, and relates to a zirconium-added high-carbon pure steel medium-frequency induction furnace smelting preparing method. The zirconium-added high-carbon pure steel is composed of components including 0.67 to 0.75% of C, 0.15 to 0.37% of Si, 0.30 to 0.80% of Mn, not larger than 0.012% of P, not larger than 0.006%of S, 0.20 to 0.50% of Cr, not larger than 0.30% of Mo, not larger than 0.30% of V, 0.002 to 0.100% of Zr, and the balance Fe and inevitable impurities. The preparing method comprises the steps of medium-frequency induction furnace smelting, LF, continuous casting treatment and the like. Compared with an existing product, the product has the beneficial effects that the mechanical performance is greatly improved, the tensile strength Rm is larger than or equal to 1400 MPa, the yield strength R0.2 is larger than or equal to 1300 MPa, the board is used for a sintered saw blade mother board, plastic deformation damage is small, the service life is prolonged, and the steel production cost is low.