44results about How to "Good alloying performance" patented technology

The invention discloses bainitic steel applied to a frog. The chemical compositions of the bainitic steel comprise, by weight, 0.03% to 0.05% of C, 0.3% to 0.5% of Si, 1.8% to 2% of Mn, no more than 0.007% of P, no more than 0.006% of S, no more than 0.0040% of N, 0.25% to 0.45% of Mo, 0.03% to 0.05% of Ti, 0.6% to 0.8% of Cr, 0.9% to 1.1% of Ni, 0.3% to 0.5% of Cu, 0.020% to 0.040% of V, 0.002% to 0.004% of B, 0.01% to 0.02% of Als, and the balance of iron and unavoidable impurities.

The invention discloses a railway track welded steel and a manufacturing technology thereof and mainly comprises the contents of chemical ingredients of the railway track welded steel, matching proportions of raw materials and the manufacturing technology thereof; the railway track welded steel contains the chemical ingredients of: 0.05-0.13 of C; not more than 0.3 of Si; 4-7 of Mn; 16-20 of Cr; 10-13 of Ni; 0.9-2.0 of Mo; not more than 0.02 of P; not more than 0.01 of S; 0.1-0.3 of Ti; not more than 0.15 of Cu; and 57.09-68.95 of Fe. The manufacturing technology of the railway track welded steel comprises the procedures: determining the selection range of chemical ingredients-working out a matching proposal according to the range of chemical ingredients-medium frequency smelting-electroslag remelting (refining)-annealing-discharging-forging-hydrogen diffusion treatment-solid solution treatment-mechanical processing-inspection test; the key manufacturing technology comprises the steps: (1) electroslag remelting (refining), (2) forging, (3) hydrogen diffusion treatment, and (4) solid solution treatment; the railway track welded steel is reasonable in matching chemical ingredients, good in alloying effect, large in the change of forging ratio and excellent in tightness of microstructure, and completely adapts to the occasion of heavy track, heavy load and large variation of temperature difference. The railway track welded steel has high indexes of performance, and the index of welding performance guarantees the quality of welded joints and the traveling safety of trains. Various indexes of performance of the product reach or exceed those of domestic and oversea similar products.

The invention relates to a locomotive braking resistance tape and a preparation method thereof. The locomotive braking resistance tape comprises the following principal components in percentage by weight: 13.5%-14.5% of chromium, 3.5%-4.5% of aluminum, 0.25%-0.35% of titanium, less than or equal to 0.04% of carbon, 0.05%-0.10% of rare-earth and the balance of iron. The preparation method of the locomotive braking resistance tape sequentially comprises the following steps: vacuum smelting, electroslag remelting, forging, hot rolling, annealing heat treatment, pickling, polishing, trimming, cold rolling, gas protection annealing and strip forming. The locomotive braking resistance tape disclosed by the invention can be used for greatly reducing the production cost by being made of a ferrite alloy without using metallic nickel any longer, enhancing the resistance uniformity of the resistance tape by adopting a titanium element and enhancing the product quality by reducing the resistance temperature coefficient of the resistance tape; the preparation method disclosed by the invention comprises a vacuum smelting procedure and can be used for lessening the sufficient air content of the generated resistance tape, thereby ensuring the product purity.