Casting method of high-hardness and erosion-resistant combined stop valve body

Abstract

The invention discloses a casting method of a high-hardness and erosion-resistant combined stop valve body. The method comprises the following steps: (1) preparing pouring liquid, wherein the pouring liquid comprises the following chemical components in percentage by weight: 0.22 to 0.26% of C, 0.25 to 0.45% of Si, 0.60 to 0.80% of Mn, 0.50 to 0.70% of Ni, 0.25 to 0.45% of Cu, 0.15 to 0.25% of B, not greater than 0.03% of P, not greater than 0.02% of S, and the balance Fe; (2) preparing a casting-infiltration coating; (3) pouring the valve body; (4) performing thermal treatment and finishing. The stop valve body manufactured by the casting method has the advantages that an uniform and stable casting-infiltration combined layer is formed on the surface, the hardness is high, and the erosion resistance is outstanding, the yield is high, the quality is stable, the appearance quality and the use performance are high, and the service life is long.

Description

technical field [0001] The invention relates to the technical field of valve casting, in particular to a casting method for a valve body of a high-hardness and erosion-resistant composite globe valve. 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...

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