Pipe die powder for centrifugally casting nodular cast iron pipe and preparation process thereof

A ductile iron pipe, centrifugal casting technology, applied in the field of ductile iron pipe manufacturing, can solve the problems of increased casting defects of ductile iron pipe, low product yield, inconsistent melting point, etc., to achieve improved product quality, simple production process, consistent melting point Effect

CN101956039BActive Publication Date: 2012-02-08YUZHOU HENGLILAI ALLOY CO LTD
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Publication Date
2012-02-08

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Abstract

The invention discloses pipe die powder for centrifugally casting a nodular cast iron pipe and a preparation process thereof. The pipe die powder comprises the following components in percent by mass: 60-65 percent of Si, 1.5-2.0 percent of Ca, 2.0-3.0 percent of Ba, 1.4-1.6 percent of Mn, 1.0-1.5 percent of Mg, 1.0-2.0 percent of Zr, 0.7-1.5 percent of Al and the balance of Fe; and the granularities of pipe die powder comprise less than 1.5 percent of 80 mu, 25-30 percent of 100-120 mu, 40-50 percent of 140-180 mu, 25-30 percent of 200-300 mu and less than 2.5 percent of more than 300 mu. The preparation process comprises the following steps of: preparing, melting, pouring, cooling, crushing, milling, proportioning granularities and packaging in vacuum. The pipe die powder has the advantages of uniform components, consistent melting points and reasonable granulometric class, and is beneficial to the prolonging of the service life of a pipe die of the nodular cast iron pipe, the reduction of a series of casting defects of cockles, poor nodulizing, surface cracks and the like of the nodular cast iron pipe, the improvement of the quality of the nodular cast iron pipe and the yield, and the lowering of the production cost.
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Description

technical field

[0001] The invention relates to the technical field of ductile iron pipe manufacture, in particular to a pipe mold powder for centrifugally casting ductile iron pipes and a preparation process thereof. Background technique

[0002] Centrifugally cast ductile iron pipes have both good corrosion resistance of cast iron and good comprehensive mechanical properties of steel, and their comprehensive economic cost is lower than that of steel pipes. Therefore, the development of centrifugal ductile iron pipes is rapid, especially in water supply projects. The application of pipes has been quite extensive, basically replacing other pipes.

[0003] Because the production process of water-cooled metal mold centrifugal casting ductile iron pipe is very different from the traditional casting process, its cooling speed is fast, it is easy to chill the casting, produce carbides, and affect the structure and mechanical properties of the ductile iron pipe, and the ductile ir...

Examples

Embodiment Construction

[0028] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0029] As shown in the accompanying drawings, the pipe mold powder preparation process of the present invention adopts a fusion method, and its specific steps are: batching, smelting, pouring, cooling, crushing, powder making, mixing according to particle size distribution, and vacuum packaging.

[0030] Further, scrap steel, ferrosilicon, silicon calcium, silicon barium, ferromanganese, pure magnesium ingot and pure aluminum ingot are used as raw materials in the batching step, and the batching is designed according to the composition content of the pipe mold powder with reference to the burning loss rate; intermediate frequency is used for melting Induction electric furnace, according to the order of steel scrap, ferrosilicon and calcium silicon, add ferromanganese, metal magnesium and metal aluminum before pouring; in the pouring step, after the alloy...