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57 results about "Ferritic alloy" patented technology

The ferritic stainless steels are sometimes called “non-hardenable” 400 series grades or alloys, and 409 and 430 are the most common. Alloys of chromium and iron with limited carbon contents that are generally below 0.12% (442, 446 are at 0.20).

Method for preparing dispersion strengthening ferritic alloy steel powder of nanometer yttrium oxide particles

The invention discloses a method for preparing dispersion strengthening ferritic alloy steel powder of nanometer yttrium oxide particles. The method includes adding ethylene diamine tetraacetic acid and chromic nitrate into water, stirring the mixture at a temperature in a range from 50 DEG C to 60 DEG C for at least 12 hours, and obtaining a mixed liquid; adding citric acid, ferric nitrate, ammonium paratungstate, yttrium nitrate and tetrabutyl titanate into the mixed liquid, mixing the mixture at a temperature in a range in a range from 60 DEG C to 70 DEG C for at least 3 hours, and obtaining colloidal sol; adding polyethylene glycol into the colloidal sol, stirring the mixture at a temperature in a range in a range from 70 DEG C to 80 DEG C to form gel; and finally drying the gel at a temperature in a range from 100 DEG C to 120 DEG C for at least 12 hours and roasting the gel at a temperature in a range from 300 DEG C to 600 DEG C for 4 to 5 hours in sequence to obtain precursor oxide powder, placing the gel in a reducing atmosphere, roasting the gel at a temperature in a range from 1100 DEG C to 1300 DEG C for at least 3 hours to obtain object products which comprise, by weight, 12% to 14% of chromium, 2% to 3% of tungsten, 0.2% to 0.5% of titanium, 0.1% to 1% of yttrium oxide, and the balance iron. Yttrium oxide is evenly dispersed and distributed on matrixes composed of chromium, tungsten, titanium and iron, and the products can be used in fast breeder reactors and fusion reactors.
Owner:HEFEI INSTITUTES OF PHYSICAL SCIENCE - CHINESE ACAD OF SCI

Locomotive braking resistance tape and preparation method thereof

The invention relates to a locomotive braking resistance belt and a preparation method thereof. The resistance belt comprises the following main components in percentage by weight: 13.5-14.5 percent of chromium, 3.5-4.5 percent of aluminum, 0.25-0.35 percent of titanium, less than or equal to 0.04 percent of carbon, 0.05-0.10 percent of rare earth and the balance of iron. The preparation method of the resistance belt sequentially comprises the following steps of: performing vacuum melting, electroslag remelting, hammering, hot rolling, annealing heat treatment, acid washing, grinding and trimming, cold rolling, gas protected annealing, stripping and forming. The locomotive braking resistance belt disclosed by the invention is ferrite alloy, and metal nickel is not used, so that the production cost can be greatly reduced. The titanium element is adopted, so that the resistance uniformity of the resistance belt can be improved, meanwhile, the resistance temperature coefficient of the resistance belt can be reduced, and further, the product quality can be improved. The preparation method comprises a vacuum melting process, so that air content in the generated resistance belt can be less, and the purity of a product is guaranteed.
Owner:DANYANG HUALONG SUPERIOR STEEL

High-temperature seamless ferritic alloyed steel and production method thereof

The invention relates to high-temperature seamless ferritic alloyed steel and a production method thereof. The steel is characterized by consisting of the following chemical components in percentage by mass: 0.05 to 0.09 percent of C, 0.20 to 0.50 percent of Si, 0.10 to 0.60 percent of Mn, 1.95 to 2.55 percent of Cr, 1.50 to 1.75 percent of W, 0.001 to 0.005 percent of B, 0.005 to 0.06 percent of Ti, 0.05 to 0.30 percent of Mo, 0.02 to 0.08 percent of Nb, 0.20 to 0.30 percent of V, less than or equal to 0.015 percent of N, less than or equal to 0.020 percent of P, less than or equal to 0.005 percent of S, less than or equal to 0.015 percent of total Al, less than or equal to 0.003 percent of O, and the balance of Fe and inevitable impurities. The ratio of Ti to N is more than or equal to 3.5. A normalizing and tempering technology is adopted in heat treatment, the normalizing temperature is 1,040 to 1,080 DEG C, the heat preservation time is not less than 1.5 minutes per 1 milliliter of wall thickness and is not less than 30 minutes, and cooling is performed at an austenitizing speed by accelerating air; and the tempering temperature is 730 to 800 DEG C, the heat preservation time is not less than 1 hour, and cooling is performed in still air. The method is high in production efficiency, high in economic benefits and suitable for large-scale production, and has high popularization value.
Owner:INNER MONGOLIA BAOTOU STEEL UNION
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