35results about How to "Promoting dispersive precipitation" patented technology

The invention discloses a preparation method of a vanadium nitride and nitride ferrovanadium alloy reinforcing agent and belongs to the field of special alloy materials. The reinforcing agent is composed of 23-66% of Si, 0.1-17.5% of Mn, 11-37% of N, 0-9.6% of Ti, 0-7.3% of Cr, 0.03-5.6% of Al, 0.1-1.9% of C, less than or equal to 0.10% of P, less than or equal to 0.15% of S, and the balance Fe and impurities. A solid nitride alloy element like silicon and manganese is preferably used and forms a nitride together with N, and the preparation method mainly has the following characteristics that1, the rate of bonding with nitrogen is high, 2, the method benefits molten steel without harm, and 3, molten steel deoxidation and desulfuration are facilitated to optimize the thermodynamic environment of the vanadium nitride and nitride ferrovanadium microalloying, more nitrogen ions can be cured, and the utilization rate of the alloy elements is greatly improved.

The invention belongs to the technical field of heat treatment of aluminum alloy, and relates to a production technology of a high-strength 7-series aluminum alloy pipe. An aluminum alloy ingot casting is prepared from the following raw materials according to the mass percentage: 7.5-8.5% of Zn, 1.0-3.5% of Mg, 0.10-0.20% of Cu, 0.05-0.3% of Zr, 0.1-1.5% of Mn, 0.05-0.3% of Cr, 0 .05% of Ti, 0.05%of B, less than or equal to 0.05% of single impurity, less than or equal to 0.15% of impurities in total and the balance Al. The two-stage homogenizing treatment and the two-stage aging heat treatment are adopted in the production technology of the aluminum alloy pipe, wherein according to the two-stage homogenizing system, the heat preservation is carried out for 24 hours at the temperature of 470 DEG C, and the heat preservation is carried out for 10 hours at the temperature of 480 DEG C; and according to the two-stage aging system, the heat preservation is carried out for 7 hours at the temperature of 110 DEG C to 130 DEG C, and the heat preservation is carried out for 10 hours at the temperature of 165 DEG C to 170 DEG C. The overall mechanical property of the high-strength 7-series aluminum alloy pipe is effectively improved.

A copper chromium zirconium alloy comprises, by weight, 0.7% to 2.0% of chromium, 0.05% to 0.3% of zirconium, 0.01% to 0.08% of magnesium, 0.01% to 0.1% of yttrium and the balance copper. The invention further provides a preparing method of the copper chromium zirconium alloy. The preparing method sequentially comprises the following steps that firstly, the copper, the chromium, the zirconium, the magnesium and the yttrium are prepared according to the proportion and are subject to vacuum purified smelting and flow dividing type casting, and a casting blank is prepared; secondly, the casting blank is subject to homogenization treatment and hot extrusion, and a sheared billet is prepared; thirdly, the sheared billet is subject to solid-solution treatment; fourthly, the sheared billet obtained after the solid-solution treatment is subject to cold deformation machining; and fifthly, a material obtained after cold deformation machining is subject to aging treatment, and the needed copper chromium zirconium alloy is obtained. The copper chromium zirconium alloy has the good comprehensive performance, the room temperature tensile strength of the copper chromium zirconium alloy is larger than 520 MPa, the room temperature elongation of the copper chromium zirconium alloy is larger than or equal to 22%, the room temperature electric conductivity of the copper chromium zirconium alloy is larger than or equal to 90%IACS, and the 350 DEG C high-temperature tensile strength of the copper chromium zirconium alloy is larger than 390 MPa.

The invention discloses a low-carbon anti-fatigue steel plate for wind power and a preparation method thereof, belonging to the technical field of iron and steel metallurgy. The chemical composition and mass percentage of the steel plate for wind power are: C: 0.08-0.12%, Si: 0.25-0.35%, Mn: 1.45-1.60%, Nb: 0.02-0.03%, Al; 0.03-0.05%, Ti : 0.01‑0.02%, Ni: 0.10‑0.20%, V: 0.02‑0.03%, Cr≤0.10%, N≤0.008%, P≤0.012%, S≤0.005%, O≤0.002%, the rest is Fe and not Avoid impurities. The preparation method includes billet heating, rough rolling process, finish rolling process, cooling process and tempering heat treatment. The invention improves the yield strength and fatigue strength of the steel plate for wind power, has excellent welding performance, and increases the service life of the steel for wind power.

The invention provides an integrated heat treatment process combining homogenization and heating and aluminum alloy castings. The process is aimed at 8000 series aluminum alloys with high Fe element content, including a homogenization heat treatment process and a heating heat treatment process, which can promote the ingot microstructure The second phase containing Fe is diffusely distributed, discontinuously distributed in a rod shape at the grain boundary, and spherically dispersed in the grain, which improves the material properties. The aluminum alloy castings using this process are subsequently processed into mirror panels without streaks and pitting defects, with high gloss and reduced overall manufacturing costs, which are suitable for industrial production of high-end 8000 series mirror aluminum alloy sheets and strips.

The invention discloses a method for producing sulphur-containing gear steel for a wind power gear. The method comprises the following steps that end-point carbon and oxygen equilibrium is 0.0026% orbelow during melting in a converter, and FeO content in large ladle slags is 1.5wt% or below; LF refining final slags adopt a high basicity and low Ca-Al ratio, RH adopts high vacuum and large circulation operation, after calcium treatment, sulphur wires are fed at interval time of greater than or equal to 8 minutes, and the soft blowing time is greater than or equal to 10 minutes; in the whole process of continuous casting, protective casting is achieved, and dynamic soft reduction is adopted; the drawing speed is stably controlled within the standard drawing speed range of 0.6+ / -0.025 m / minand the water content of secondary cooling ratio is controlled at 0.45-0.50; after continuous casting, a rectangular billet is subjected to heating and cogging, and then is rolled into the square billet and slowly cooled; after checking the slowly-cooled square billet, four horizontal surfaces are coated with anti-high-temperature and anti-oxidation coatings; and the square billet is heated in a heating furnace, the surface of the square billet is dephosphorized by high pressure water after being heated, then a finished bar is rolled according to the conventional process, and the temperature is controlled at 800-830 DEG C after finishing rolling. By means of the method for producing sulphur-containing gear steel for the wind power gear, the technical problems of high oxygen content, unstable composition content and uniformity, uncontrollable sulfide precipitation and high banded structure grade can be effectively solved.