铁是含碳量大于2％的铸铁合金,并含有一定数量的Si和少量的Mn;S、P通常视为杂质。铸铁件在水利工程上应用很广泛,例如闸门的铸铁主轨。由于铸铁主轨在铸造过程中,因杂质、铸造工艺等诸多原因,容易产生气孔、夹砂、缩孔裂纹、浇铸不足等缺陷;而在使用时,由于超负荷、天气变化等原因,都可能造成损坏。对于这些 Iron is a cast iron alloy containing more than 2% carbon and contains a certain amount of Si and a small amount of Mn. S and P are usually considered as impurities. Cast iron parts in water conservancy projects are widely used, such as the gate of the main cast iron rail. As the cast iron main rail in the casting process, due to impurities, casting process and many other reasons, prone to stomatal, sand, shrinkage cracks, casting inadequate defects; and in use, due to overload, weather changes and other reasons, may Cause damage. For these