Class 2 (2nd Engineer) MEKG 📅 Jun 2023

Exam Question

Cast iron is most widely used after steel in Marine Engineering. Most cast iron consists of graphite in steel like matrix. Discuss the variation of properties that may arise with reference to pearlitic grey cast iron and spherical grey cast iron. Briefly describe the treatment necessary to produce these two types of

Irons. (16)

Reference Answer

### Introduction to Cast Iron
Cast iron is a ferrous alloy with a carbon content typically exceeding 2.11%, which is the limit of solubility of carbon in austenite. In marine engineering, it is valued for its castability, wear resistance, damping capacity, and relatively low cost. The properties of cast iron are primarily determined by the form and distribution of free carbon (graphite) within its metallic matrix. This answer will discuss the properties and production of two specific types: Pearlitic Grey Cast Iron and Spherical Grey (Spheroidal Graphite) Cast Iron.
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### 1. Pearlitic Grey Cast Iron

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