47results about How to "Short smelting cycle" patented technology

The invention relates to high-temperature-resistant austenitic stainless steel for a furnace pipe. The high-temperature-resistant austenitic stainless steel comprises the following components in percentage by mass: 24-26% of Cr, 19-21% of Ni, 0.3-0.8% of Si, 0.02-0.06% of C, 1.0-1.5% of Mn, 1.5-2.5% of W, less than or equal to 0.2% of N, less than or equal to 0.04% of P, less than or equal to 0.03% of S and the balance of Fe. According to the high-temperature-resistant austenitic stainless steel, high-temperature creep resistance and oxidation resistance which are better than those of 310 heat-resistant stainless steel are provided; and the high-temperature-resistant austenitic stainless steel can be used for a longer time at a temperature above 1000 DEG C.

The invention relates to a production process of an austenitic stainless steel slab used for a high temperature resistant furnace hearth. The production process can save cost, reduce energy consumption and improve the economic benefit, and is green and environment-friendly. Steel tapping of Consteel electric furnace mother liquid contains the following components: greater than 1.0% of C, less than 1.0% of Si, less than or equal to 2% of Cr, 25-35% of Ni, less than 0.01% of P, 3-5% of W, and the balance Fe; steel tapping temperature is controlled to be 1580-1630 DEG C; the Consteel electric furnace mother liquid is blended with intermediate frequency furnace high carbon ferro-chrome molten steel and then the mixture is blended into an AOD furnace for smelting, and the steel tapping temperature after smelting is controlled to be 1550-1630 DEG C; a stainless steel solution contains the following components: 24-26% of Cr, 19-21% of Ni, 0.3-0.8% of Si, 0.02-0.06% of C, 1.0-1.5% of Mn, 1.5-2.5% of W, less than or equal to 0.2% of N, less than or equal to 0.04% of P, less than or equal to 0.03% of S, and the balance Fe; and the LF furnace crane ladle temperature is controlled to be 1500-1520 DEG C, and then continuous casting is carried out on the stainless steel solution by using a continuous casting machine to form a slab with thickness of 160-220 mm.

The invention discloses a method for smelting ZG06Cr13Ni4Mo steel, which comprises the following steps: S1 calculation of ingredients, calculation of total charge according to the amount of molten steel required by the product, selection of charge and alloy with Ni weight percentage of 4% as the target value, charge including return of 25Cr2Ni4MoV raw materials, nickel-containing pig iron, high-quality scrap steel; S2 electric arc furnace roughing, including charge melting, dephosphorization and decarburization, pre-deoxidation, alloying, reduction and tapping steps, wherein, in the dephosphorization and decarburization step, when [C]≤ When 0.02% and [P]≤0.003%, the oxidized slag is removed, and in the pre-deoxidation step, after all the oxidized slag is removed, 5.0-6.0kg / t steel of aluminum and iron is added for pre-deoxidation; S3 ladle refining, the total refining time ≥1h, lift out and pour after refining. The invention utilizes an electric arc furnace and a refining furnace to produce low-carbon stainless steel products with w(C): 0.04-0.06%, the technological process is simple, the smelting cycle is short, the equipment complexity is reduced compared with the VOD and AOD smelting processes, the smelting cost is low, and The average oxygen content in molten steel is 5.9ppm, which improves the purity of molten steel.

The invention relates to a reflecting furnace for smelting tin lead materials, belonging to smelting equipment. The reflecting furnace is mainly composed of a furnace hearth (1), a furnace bottom smelting tank (2), a furnace wall (3) and a furnace top (4), wherein the furnace bottom smelting tank (2) is positioned below the furnace hearth (1), and a low fire baffle wall (6) is arranged between a fire chamber (5) in the furnace wall and the furnace hearth (1). A slag discharging opening (12) for discharging tin lead alloy is arranged on one side wall of the furnace near the position of a furnace tail, two working doors (13, 14) are arranged on the other side wall of the furnace, a smoke outlet (15) is arranged on the furnace wall at the tail part, and a charging opening (16) is arranged on the furnace top (4). The arc shape of the furnace top on the low fire baffle wall (6) is shown to press down towards the two sides; the position of the furnace top to the furnace hearth (1) is horizontal, and the position of the furnace top to the furnace tail is pressed towards the furnace tail in an inclined manner. The reflecting furnace has the advantages of high heat efficiency, quick material smelting, low cost and less coal consumption with the coal combustion rate of 42 to 48%.

The invention relates to a top oxygen-blowing combustion system for an intermediate frequency furnace and belongs to the technical field of the intermediate frequency furnace. A bracket is arranged above a furnace cover of the intermediate frequency furnace; a vertical guide rail and a lifting trolley are mounted on the bracket; the lifting trolley is supported on the vertical guide rail by idler wheels and is capable of moving up and down; an upper chain wheel is mounted at the upper end of the vertical guide rail; a lower chain wheel is mounted at the lower end of the vertical guide rail; the upper chain wheel and the lower chain wheel are in transmission connection through a chain; one end of the chain is connected with the upper part of the lifting trolley while the other end is connected with the lower part of the lifting trolley; an intermediate frequency furnace oxygen combustion gun is fixedly arranged on the lifting trolley; and a gun head of the intermediate frequency furnace oxygen combustion gun is vertically inserted into the intermediate frequency furnace from the top of the furnace cover along the axis of the furnace cover. The furnace oxygen combustion gun is capable of spraying baking flame to preheat metal in the earlier stage and then is capable of spraying cutting flame to cut the metal; after the metal is molten, molten iron is stirred and slagged; lastly, decarbonization is realized; no decarbonizing agent is necessary; the smelting period is greatly shortened; the power consumption of an intermediate frequency power supply is reduced; and the tapping quality is high.