Pipe powder for ductile iron

Abstract

This case discloses a pipe mold powder for ductile iron, including the following materials by weight: 50-52 parts by weight of silicon, 30-32 parts by weight of calcium, 16-18 parts by weight of strontium, and 0.1-0.3 parts by weight of sulfur , 2 to 4 parts by weight of vanadium, 1 to 3 parts by weight of boron, 1 to 3 parts by weight of cobalt, 0.5 to 1.5 parts by weight of barium sulfide, 0.05 to 0.1 parts by weight of iron sulfide, and 0.05 to 0.1 parts by weight of platinum , 0.05-0.1 parts by weight of indium and 0.005-0.01 parts by weight of tungsten oxide. In this case, through the improvement and optimization of the formula of pipe mold powder for ductile iron, a variety of elements with synergistic effects were introduced, which effectively improved the nodularization rate and number of graphite balls of the pipe mold powder, and reduced the number of pores on the surface of ductile iron pipes and the number of pinholes. At the same time, the formula reduces the use of precious metals, which not only reduces production costs, but also reduces damage to the environment.

Description

technical field [0001] The invention relates to a pipe mold powder, in particular to a pipe mold powder for producing ductile iron pipes. Background technique [0002] When producing ductile iron pipes, there will be a certain amount of carbon, which will be closely combined with iron, and the form of carbon in solidified cast iron is very important for the performance of cast iron pipes. If this carbon is in the form of iron carbide, the cast iron is called white iron, which is hard and brittle and of poor practicality. If the carbon is in the graphite state, the cast iron is soft and easy to process, and it is called gray cast iron, which is practical. The graphite state can be divided into flake, dense and spherical, among which the spherical form can show the highest strength and the most ductile form of cast iron. Therefore, during the solidification process of cast iron, it is necessary to use the auxiliary effect of additives to make the ductile iron pipe achieve th...

AI Technical Summary

Problems solved by technology

Most of the existing technologies use several kinds of raw materials to be mechanically crushed, and the cold processing process of directly mixing and formulating the powder is used to make the tube mold powder. The performance is unstable, the spheroidization rate is low, the number of graphite balls is small, and the pinhole rate is high

Especially when used in the production of small-diameter ductile iron pipes, the casting defects of ductile iron pipes increase significantly due to the substantial reduction in the amount of molten iron.

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