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The most common traditional form is grey cast iron. Common or grey cast iron is easily cast but it cannot be forged or worked mechanically, either hot or cold.

In grey cast iron, the carbon content is in the form of flakes distributed throughout the metal. In white cast iron, the carbon content is combined chemically as carbide of iron. White cast iron has superior tensile strength and malleability. It is also known as 'malleable' or 'spheroidal graphite' iron.

Cast iron is still manufactured by much the same process as it was produced historically. Iron ore is heated in a blast furnace with coke and limestone. This process "deoxidizes" the ore and drives off impurities, producing molten iron. The molten iron is poured into molds of the desired shape and allowed to cool and crystallize.

Upon manufacture, cast iron develops a protective film or scale on the surface which makes it initially more resistant to corrosion than wrought iron or mild steel. Finishing may include bituminous coatings, waxes, paints, galvanizing and plating. In addition, there are a variety of treatments that can reduce rusting and corrosion caused by environmental factors. Factory preservative treatments are typically barrier coatings intended to prevent the castings from oxidizing (rusting) in the presence of humidity and oxygen in the air.

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25 Years Experience
Leyon steel also known as “China malleable”. For these 25 years, Leyon is always focusing on research and development of malleable iron fittings, grooved fittings, grooved couplings, tubing and valves that are mainly applied in such industries as fire protection, water supply, construction industry, municipal engineering and petrochemical.

Currently, Leyon is one of the largest pipe fittings manufacturers in the world, and is dedicated to provide secure, reliable and cost effective pipe fittings, with large products capacity, superior quality, strong R&D strength and first class service.

Our main production facilities include Sinto automatic molding line, automatic molding sand mixers from Germany, cupola furnaces, electric furnaces and more.

Leyon is also ISO 9001:2008-, BSI-, CCC-, UL- and FM-certified, furthermore, we were named as the Shanxi Famous brand.

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