Talk about stainless steel pipe corrosion prevention requirements?
The choice of stainless steel pipe data is mainly considered from the following five aspects. The requirements for fastener data in terms of mechanical properties, especially strength, and the requirements for corrosion resistance of data under working conditions. The requirements of the working temperature on the heat resistance of the data (high temperature strength, oxidation resistance), and the requirements of the consumption process on the processing performance of the data.
Other aspects, such as weight, price, procurement elements should be thought about, after a comprehensive and comprehensive thinking of these five aspects, the final selection of fasteners, types, specifications, data specifications, Austenotype stainless steel commonly used for 302, 303, 304, 305 four grades, The so-called "18-8" type austenitic stainless steel of these four grades.
Whether it is corrosion resistance, or its mechanical properties are similar. The starting point is the consumption process method of fasteners, and the method depends on the size and shape of fasteners, and also depends on the amount of consumption. Martensitic stainless steel type and type 416 can be heat-treated and strengthened, the hardness is 35~45HRC, and the machining performance is good, which is used for heat-resistant and corrosion-resistant fasteners for ordinary purposes. Type 416 has a slightly higher sulfur content and is a free-cutting stainless steel.
The sulfur content ≧0.15%, mechanical properties improve, can be strengthened by thermal disposal, hardness value 53~58HRC, for fasteners requiring higher strength. Precipitation-hardened stainless steels, PH15-7Mo, are able to obtain higher strength than the usual type 18-8 stainless steels and are therefore used in high-strength, corrosion-resistant stainless steel fasteners. A non-standard stainless steel, which has higher corrosion resistance than the commonly used 18-8 stainless steel, and still has good mechanical properties when the temperature increases.
