Heat cast iron
Heat cast iron is an antioxidant, anti-growth properties at high temperatures, and can maintain a high strength special cast iron.
- heat-resistant cast iron requirements
The main requirement is heat-resistant cast iron has good resistance to oxidation and growth resistance.
1, oxidation resistance
The so-called oxidation resistance, heat-resistant cast iron is its resistance to the surrounding atmosre corrosion resistance at high temperatures to work. Generally, heat-resistant cast iron at the specified operating temperature, 150h oxidation average speed does not exceed 0.5g / (m2 • h).
2, anti-growth resistance
The so-called anti-growth resistance is heat resistant cast iron irreversible volume grew performance at high temperature. Generally, heat-resistant cast iron at the specified operating temperature, the ability to resist 150h growth should not exceed 0.2% (mass fraction).
- heat-resistant cast iron classification
Join Si, Al, Cr and other alloying ary cast iron, cast iron can improve the heat resistance. Heat cast iron is generally divided into silicon-based heat-resistant cast iron, aluminum-based heat-resistant cast iron, cast iron and aluminum-silicon-based heat resistant chromium cast iron.
Due to the high heat-resistant silicon cast iron, aluminum and other nt, therefore, somewhat less when casting fluidity, rinkage larger, higher brittle transition temperature, casting often prone to cracking. So there is a certain degree of particularity in shape and off the sand clean-up process, and ordinary cast iron is different. Heat cast iron casting defects are cold cracking, porosity, grate segregation and shrinkage and so on.
