Austenitic Castings & Ni-Resist Cast Iron Structure
Austenitic irons, which can be produced with either a flake graphite or a spheroidal graphite structure, have a range of properties which far outperform a normal grey or ductile iron. These include good scaling resistance, high resistance to heat, good thermal expansion characteristics, resistance to corrosion in seawater and alkaline liquids and atmospheres, good cold toughness and resistance to erosion.
Certain grades are also non-magnetic. They offer numerous economic advantages compared to non-corrosive heat resistant steel because the production process control is far simpler, the melting and casting temperatures are lower, the castings don’t require heat treatment and the metal has better machining characteristics.