Casting method of slurry valve body for papermaking

Abstract

The invention discloses a casting method of a slurry valve body for papermaking. The casting method comprises steps as follows: (1), a pouring liquid is prepared and comprises chemical components in percentage by weight as follows: 0.22%-0.26% of C, 0.25%-0.45% of Si, 0.60%-0.80% of Mn, 0.30%-0.50% of Al, 0.30%-0.50% of Zn, 0.20%-0.40% of Zr, 0.05%-0.10% of Ga, smaller than or equal to 0.03% of P, smaller than or equal to 0.02% of S and the balance of Fe; step (2), a casting-infiltration coating is prepared; (3), valve body pouring is performed; (4), heat treatment and finishing are performed. According to the slurry valve body obtained with the casting method, the stable casting-infiltration composite layer is formed on the surface; furthermore, the slurry valve body has the advantages of excellent corrosion resistance and lubricating property, high finished product ratio, stable quality, good appearance quality and usability and long service life, and is applicable to conveying of papermaking slurry.

Description

technical field [0001] The invention relates to the technical field of valve casting, in particular to a casting method of a slurry valve body for papermaking. Background technique [0002] Valves are important components for the conveying and control of flowing materials. In use, in addition to meeting the requirements of technical indicators such as temperature and pressure, they must also meet the different needs of materials with different properties, such as corrosion, wear, adhesion, etc. At the same time, the sealing performance and service life of the valve are also very important technical indicators. [0003] The casting infiltration method is to make alloy powder and other raw materials into paint and brush it on the surface of the mold. When pouring, the matrix metal liquid penetrates into the capillary pores of the paint, and the alloy powder is melted and melted by the heat of the metal liquid, and is fused with the base metal. The surface forms a surface comp...

AI Technical Summary

Problems solved by technology

However, due to the problems of pores, slag inclusions and uneven thickness of the surface composite layer, the casting infiltration technology is prone to problems, which will lead to casting defects when it is actually applied to the production of valve bodies, which will affect the appearance quality and service life of the valve body.

The literature "Research on Improving the Wear Resistance of Cast Steel Valves by Casting Infiltration" uses the casting infiltration process to make valves with good erosion resistance, which improves the service life of the valves, but it also points out that the problem of poor quality stability of the infiltration layer is still exists, needs to be further improved