Casting method for anti-corrosive and abrasion-resistant composite check valve body

Abstract

The invention discloses a casting method for an anti-corrosive and abrasion-resistant composite check valve body. The casting method includes the following steps that (1) casting liquid is prepared, and chemical components of the casting liquid comprise, by weight, 0.22%-0.26% of C, 0.25%-0.45% of Si, 0.60%-0.80% of Mn, 0.15%-0.25% of V, 0.30%-0.50% of Ni, 0.10%-0.15% of Al, 0.03% or less of P, 0.02% or less of S, and the balance Fe; (2) casting-infiltration coating is prepared; (3) the valve body is cast; and (4) heat treatment and finishing are conducted. The check valve body obtained through the casting method disclosed by the invention is provided with a uniform and stable casting-infiltration composite layer on the surface, has excellent anti-corrosion and abrasion-resistant performance, and is high in yield, stable in quality, good in appearance quality and use performance and long in service life.

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 corrosion-resistant and wear-resistant composite check 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 b...

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