What is a austenitic cast iron?

The austenitic cast irons are a range of highly alloyed cast irons containing nickel, and, according to the grade: manganese, copper, chromium, niobium, and an elevated silicon content. Carbon is present either as flake (lamellar) or spheroidal graphite and, in some grades, carbides.

Why is cast iron used for many applications?

A versatile metal, cast iron has many unique applications in the commercial and industrial world. Cast iron has excellent castability due to the combination of high carbon content and silicon. Blacksmiths became a critical profession, working with iron to change its properties and shape the material into tools.

What are the applications of GREY cast iron?

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.

Why cast iron has limited engineering application?

Applications are limited, however, to relatively thin-sectioned castings because of the high shrinkage rate and the need for rapid cooling to produce white iron.

Which type of cast iron is the toughest?

high-nickel cast irons
Because of their austenitic matrix and with flake graphite, the high-nickel cast irons are the toughest of all cast irons. The flake graphite also gives them excellent machinability and good foundry properties, although this gives them lower tensile strengths.

What is cast iron and its classification?

Cast iron is an iron alloy containing 2 wt. Depending on the silicon content of the cast iron, it is classified as either white cast iron or grey cast iron and may be treated further under particular temperatures to produce malleable or ductile cast iron.

What are the uses of austenitic ductile cast iron?

Austenitic ductile castings are widely used in gear and structural components, such as brackets, frameworks and bases, etc. The following is the main content of ASTM A436-1997/ASTM A439-1999 standard for your reference. Grade and tensile strength and chemical analysis of austenitic cast iron with the type of flake graphite (mass fraction) (%)

How is an austenitic cast iron casting made?

Austenitic cast iron is produced by taking a normal grey or ductile iron melt, controlling the carbon and silicon at lower levels and adding various alloys to produce a stable austenitic structure at ambient temperature.

Which is ASTM standard for austenitic cast iron?

The following is the main content of ASTM A436-1997/ASTM A439-1999 standard for your reference. Type and chemical analysis of austenitic nodular cast iron (mass fraction) (%) Grade and tensile strength and chemical analysis of austenitic cast iron with the type of flake graphite (mass fraction) (%)

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.