The performance of the ductile iron manhole covers

by:XEX     2021-03-31
Nodular cast iron manhole covers the performance requirements of nodular cast iron has high strength, high plasticity, high toughness, high abrasion resistance, strong thermal mechanical impact, high and low temperature resistance, corrosion resistance and dimensional stability, etc, has been widely used in major industrial sectors. In order to meet the change of the conditions of use, nodular cast iron has a lot of brands, they offer a wide range of mechanical and physical properties. ISO 1083 rules, for example, most of the ductile cast iron is mainly under the state of the alloy production. Obviously, this include tensile strength is greater than 800 NMM and elongation is 2% high strength grade. At the other extreme is a high level of plastic, elongation rate more than 17%, the corresponding low intensity ( Minimum 370 NMM) 。 Strength and elongation is not the only basis for designers to choose materials, and other crucial and important properties including yield strength, elastic modulus, abrasion resistance and fatigue strength, hardness and impact performance. In addition, corrosion resistance, oxidation resistance and electromagnetic performance may be the key to the design personnel. In order to meet these special application, developed a set of austenitic ductile iron, often referred to as Aoni - Reis ball iron. The austenite nodular cast iron is mainly composed of zinc, chromium and manganese, and has been listed in the international standard.
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