Ball Industrial Valves is widely used in the area of each big ball valve in accordance with the sealing can be divided into soft sealing ball valves and hard seal ball valve two kinds. Metal hard seal ball valve at present commonly used metal hard seal ball Industrial Valves sphere surface hardening technology basically has the following kinds: 1, the sphere surface welding ( Or spray welding) Hard alloy, hardness can reach more than 40 HRC, sphere surface complex carbide surfacing process, low production efficiency, and large area of surfacing welding deformation, easy to make parts for sphere surface hardening process with less now. 2, sphere surface hard chromium plating, hardness of 60 ~ 65 HRC, thickness of 0. 7 ~ 0. 10 mm, chromium plating layer of high hardness, wear resistance, corrosion resistance and can keep the surface bright for a long time, technology is relatively simple, low cost. But the hardness of hard chromium plating when temperature rises rapidly due to the release of its internal stress is reduced, the working temperature is not higher than 427 ℃. Other binding force low chromium plating layer, plating prone to fall off. 3, sphere surface plasma nitriding, the surface hardness of 60 ~ 65 HRC, thickness of nitriding layer 0. 20 ~ 0. 40 mm, plasma nitriding treatment hardening process due to the corrosion resistance is poor, cannot be used in chemical corrosion, etc. 4, sphere surface supersonic spraying process, the hardness up to 70 ~ 75 HRC, set high intensity, thickness of 0. 3 to 0. 4 mm, supersonic spray coating is a sphere surface hardening of the main technological means. In thermal power plants, petrochemical industry system, coal chemical industry in the field of high viscous fluid; With dust and solid particle mixing fluid, most of the strong corrosion fluid using the hardening process.
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