Ball valve 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 valve 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, high hardness can reach 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. Hard seal ball valve ball and seat hardening pay attention to the problem: the metal hard seal ball valve valve ball and seat materials generally choose stainless steel or corrosion resistant material, otherwise the carbide and valve seat ( Or Industrial Valves ball) Combining layer easy to corrosion medium, hard alloy layer peeling, affecting the service life of ball valve. In addition to a different seat ( Or valve ball) Material should choose appropriate hardening process, duplex stainless steel materials in the field of coal chemical industry are widely used, duplex stainless steel material with good resistance to corrosion fatigue wear and corrosion resistance. Duplex stainless steel material is a kind of has both ferrite and austenite structure steel, ferrite and austenite structure each accounts for about 50%, and the two phase organization is independent, its performance is characterized by both the characteristics of austenitic stainless steel and ferritic stainless steel. In ferritic stainless steel properties, when the temperature within the range of 400 ~ 500 ℃, the heat preservation for a long time will produce strong embrittlement, this phenomenon is commonly known as 475 ℃ embrittlement; At more than 400 ~ 500 ℃ temperature, duplex stainless steel performance will be destroyed. Duplex stainless steel material, if the use of spray welding or surfacing welding carbide process method, the carbide and matrix melting process of soluble ( Temperature is typically greater than 900 ℃) May harm the microstructure of duplex stainless steel material, so the duplex stainless steel material res spray welding ( Or welding) The hardening technology of cemented carbide. Duplex stainless steel material surface hardening process suitable for use of supersonic spray process, hardening process must ensure that not the matrix microstructure of duplex stainless steel material.
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