Article | REF: M3616 V1

Spheroidal graphite cast irons

Author: Alex RÉMY

Publication date: June 10, 2016, Review date: September 10, 2021

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ABSTRACT

Its numerous advantages explain the success of cast iron with spheroidal graphite for the design of new parts in all industrial sectors. These benefits come from the versatility of the spheroidal graphite cast iron, which often offers designers the best property trade-off. This versatility is particularly evident with regard to its mechanical properties (high ductility or high mechanical strength). These properties are often combined with high resistance to wear and corrosion. This article presents the different types of spheroidal graphite cast iron that enable designers of mechanical systems to optimize the manufacture of systems in terms of the expected behavior of the material and cost control, while still meeting European standards.

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AUTHOR

  • Alex RÉMY: Arts et Métiers engineer, Professor - École Nationale Supérieure d'Arts et Métiers de Paris, France

 INTRODUCTION

After a brief review of the conditions under which spheroidal graphite cast irons are produced, we present the unique combination of properties of this material, enabling you to make a safe and economical choice of material for use in a wide range of industrial applications: mechanical engineering, civil engineering, transport, and so on.

The technologies used for destructible molds make it possible to combine numerous functions in a part with complex shapes, while respecting the corrosive atmospheres and temperatures imposed on the system integrating this part.

Designing a part for optimum cost effectiveness involves a number of factors:

  • the necessary resistance,

  • the cost of machining,

  • cooling speed,

  • simplicity of design,

  • a healthy, pressure-tight part due to volume expansion, and directional solidification that limits the need for trimming.

Many cast or forged steel parts can be converted into spheroidal graphite cast iron. The many applications for these cast irons are based on their ductility, but their most appreciated advantages are their high modulus of elasticity and mechanical strength, enabling them to withstand heavy loads with little deformation. The production of spheroidal graphite cast irons requires careful metallurgy: the use of impurity-free metallic fillers and close control of the production process.

This article presents the mechanical and physical characteristics of the most common grades of spheroidal graphite cast iron.

A glossary of terms is provided at the end of the article.

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KEYWORDS

mechanical   |   foundry   |   engineering   |   GS fontes   |   operating conditions of the GS fontes


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Spheroidal graphite cast irons
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