High temperature steel pipe has good oxidation resistance and corrosion resistance, because the higher percentage of chromium and nickel makes it have much better creep strength, can continue to work at high temperatures, and has good high temperature resistance.
Anti-rust method of high temperature steel pipe:
1. Use wire brushes and other tools to polish the surface of high temperature steel pipes;
2. Cleaning and preheating. It can remove loose or warped oxide scale, rust, welding slag, etc. on the surface of high temperature steel pipe to prevent the spread of rust.
3. Pickling. Use solvents and emulsions to clean the surface of high-temperature steel pipes to remove oil, grease, dust, lubricants and similar organic matter to prevent rust.
4. Electroplating, galvanizing is best. Metal zinc can react with oxygen to generate zinc oxide. This is a dense oxide film with stable properties and can play a good protective role. Anodizing and surface blackening treatment are anti-oxidation. Or nickel plating, it can prevent rust well
The steam pipes are not painted for the following reasons:
Generally, the temperature that the paint can withstand does not exceed 150°C. If the problem is too high, the paint is easy to be ignited, and even if it does not burn, it will be carbonized. Therefore, if there is a real requirement, you can apply some high-temperature paint.
But the temperature of steel is higher than 150℃, which is about this temperature! Sometimes blue and black will occur when the temperature exceeds 100°C, that is, a dense ferroferric oxide film is formed on the surface, which can prevent further corrosion of steel.
Therefore, general high-temperature steam pipes do not need to be painted.