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Grey Cast Iron, Nodular Cast Iron and Other Cast Irons


Grey cast iron

Grey cast iron is a type of cast iron with lamellar graphite. It is an alloy of iron and carbon. The carbon content in the alloy is between 3.0 and 3.7 %, while it also includes silicon (from 1.5 to 2.5 %), manganese (from 0.5 to 1.4 %) and sulphur (up to 0.12 %). In iron, carbon is excreted in the form of graphite lamellas and sheets. The fracture surface of such iron is grey; this is the source of the name.

The properties of grey cast iron mainly depend upon the size and form of the excreted graphite sheets. The larger the graphite sheets, the larger the cracks in the cast iron and the lower the strength of the cast iron.

The main mechanical properties of grey cast iron are its tensile strength and hardness. Both are regulated by the EN-1561 standard that classifies individual types of cast iron by quality. We manufacture grey cast iron in the range from EN-GJL-150 to EN-GJL-300.

Nodular cast iron

Nodular cast iron is grey cast iron with spherical graphite. It differs from the grey cast iron with lamellar graphite in its chemical composition, merely due to the fact that, in addition to the basic elements, it also contains small quantities of magnesium (from 0.04 to 0.06 %), cerium and rare earths that influence the formation of graphite spheres.

The properties of nodular cast iron are not only dependent upon the size, number and arrangement of graphite balls in the cast iron, but also upon the basic matrix consisting of ferrite and perlite. At the same hardness levels, nodular cast iron has much higher tensile strength than grey cast iron; therefore, toughness and elongation are great advantages of nodular cast iron.

As in case of grey cast iron, the tensile strength and strain define the quality of the cast iron. In accordance with the EN-1563 standard, We manufacture nodular cast iron of quality levels EN-GJS-400-15, EN-GJS-500-7, EN-GJS-600-3 and EN-GJS-700-2, as well as cast irons of other quality levels, according to agreements with clients.

Other cast irons

For specific circumstances of use, we also offer other kinds of cast iron that, above all, excel for their toughness and preservation of properties, also at extremely low temperatures. In particular, this includes cast irons of EN-1561 and EN-1563 standards or a specific standard of the client.

For the railway industry and the wind power plant and pipe fitting industry, we offer two kinds of other cast irons: grey cast iron with EN-GJS 400-18 LT spheroidal graphite that has a more than 18-percent elongation and adequate toughness at low temperature (up to -20 °C), as well as grey cast iron with lamellar graphite alloyed by phosphor that meets the standards for railway products. At our client’s request, we also manufacture vermicular and other cast irons.





Liaoning Borui Machinery Co., Ltd. All rights reserved.
Add: No.1-4-6, Jianshe Road, Qianyang, Donggang City, Dandong, Liaoning, China 
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