Sewage pipe soft seal gate valve body and preparation method thereof
A sewage pipeline, soft sealing technology, applied in valve details, valve device, valve shell structure and other directions, can solve the problems of small operating temperature range, high thermal expansion coefficient, easy to cause air leakage, etc., to achieve stable spheroidization reaction and absorption rate High, increased strength effects
Inactive Publication Date: 2015-04-29
TONGLING JINGWEI FLUID SCI & TECH
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Problems solved by technology
[0004] At present, many soft-sealed gate valve bodies are made of ductile iron, which has some disadvantages, such as no corrosion resistance, high thermal expansion coefficient, small operating temperature range, and easy to cause air leakage.
Method used
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Experimental program
Comparison scheme
Effect test
Embodiment Construction
[0015] A soft-sealed gate valve body for sewage pipelines, which contains chemical element components and mass percentages: C2.1-2.4, Sc 0.04-0.07, Si2.5-2.9, Mn2.0-2.6, P<0.03, S<0.01, Cr2-3, La0.03-0.05, Ni3.5-3.9, the balance is Fe.
[0016] The valve body of the soft-sealed gate valve for the sewage pipeline has a metallographic structure of 50% pearlite+50% ferrite, and the structure is pearlite within a depth of 18 mm from the surface, and the layer of pearlite The spacing is between 100-160nm, the ratio of cementite thickness to ferrite thickness in pearlite is 0.11-0.23, and the average particle size of pearlite is 12μm.
[0017] The production method of the soft-sealed gate valve body for sewage pipelines is characterized in that:
[0018] The production process includes batching, feeding, smelting, spheroidizing, casting, and trimming;
[0019] In the batching process, the raw materials contain 15% by weight of waste ductile iron and 15% by weight of steel scrap; w...
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Abstract
Disclosed is a sewage pipe soft seal gate valve body. The sewage pipe soft seal gate valve body is composed of chemical element components including, by mass percentage, 2.1-2.4 of C, 0.04-0.07 of Si, 2.5-2.9 of Si, 2.0-2.5 of Mn, less than 0.03 of P, less than 0.01 of S, 2-3 of Cr, 0.03-0.05 of La, 3.5-3.9 of Ni and Fe as balance. According to the sewage pipe soft seal gate valve body, by adding Ni and Cr, the corrosion resistance and the thermal resistance of the valve body can be enhanced, and the sewage pipe soft seal gate valve body is applied to a sewage pipe; by means of specific components and metallic phase waste nodular cast iron as well as waste steel, the strength, the tenacity and the quality stability of the valve body can be enhanced; a nodulizing process enhances the absorptivity of Mg, RE and Si, stabilizes nodulizing reaction and avoids nodulizing degradation after 15 minutes of the nodulizing reaction is completed.
Description
technical field [0001] The invention relates to the field of casting technology, in particular to a soft-sealed gate valve body for sewage pipelines and a preparation method thereof. Background technique [0002] The soft-sealed gate valve is an important control part of the water medium fluid pipeline. The products of the soft-sealed gate valve mainly include: valve body, valve plate, trapezoidal nut, trapezoidal threaded stem, gasket, bonnet, and rotating handwheel. The working principle of the soft seal gate valve: the valve plate is installed in the guide groove of the valve body, and the trapezoidal nut is placed in the top groove of the valve plate; one end of the trapezoidal thread valve stem is installed with a rotating handwheel, and the other end is screwed into the trapezoidal nut; The threaded valve stem drives the trapezoidal nut and the valve plate to move up and down, and the valve plate closes and opens to make the water medium fluid on and off. [0003]...
Claims
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IPC IPC(8): F16K27/04C22C38/58C22C33/08
CPCF16K27/04C22C33/08C22C38/58
Inventor 吴寿涛
Owner TONGLING JINGWEI FLUID SCI & TECH