What is the hardest that gray cast iron can be?
gray irons are equally strong, or equally hard. As in steel, tensile strength and hardness are closely related. In gray irons, tensile strength ranges from about 14 MPa (20,000 psi) to more than 35 MPa (50,000 psi). The hardness of the strongest grades is double that of the weakest grades.
What is austenitic cast iron?
What is Austenitic Cast Iron? This describes a range of cast irons with nickel, and to a lesser extent chromium and copper as the alloying elements. This produces a metallic matrix that is austenitic at ambient temperatures and can be produced either in a flake or spheroidal graphite form.
What gives gray cast iron its gray?
graphite fractures
Grey cast iron (a.k.a. gray iron castings) is a type of iron found in castings known for its grey color and appearance caused by graphite fractures in the material.
What is GREY cast iron used for?
It is the most common cast iron and the most widely used cast material based on weight. It is used for housings where the stiffness of the component is more important than its tensile strength, such as internal combustion engine cylinder blocks, pump housings, valve bodies, electrical boxes, and decorative castings.
What are the different types of austenitic cast iron?
The types of austenitic cast iron include austenitic gray cast iron and austenitic ductile cast iron. Austenitic gray cast iron has good machinability, corrosion resistance, heat resistance, acid resistance and alkali resistance.
Why are austenitic iron castings called Ni resist?
Nickel is the main alloying element, hence the alternative name of Ni-Resist, and is the principle reason why the casting has an austenitic structure with nickel stabilising the austenite during solidification.
What are the different types of cast iron?
This is an America standard for the physical properties, mechanical properties and chemical analysis of austenitic cast iron. The types of austenitic cast iron include austenitic gray cast iron and austenitic ductile cast iron.
What kind of graphite is used in austenitic iron?
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.