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In recent years, reduction in weight of deckhouse of cargo ships in field of naval engineering is becoming a huge concern. Due to heavy weight of deckhouse, ships are unable to carry enough cargo to supply from one place to another. Reducing the weight of the deckhouse without losing its strength can allow us to do so. This can lead to transfer of more goods from one place to another which will help generate more profit. Aluminium and its alloys have good mechanical and physical properties for many different applications in different fields. Its impressively low strength/weight ratio as compared to stainless steel and its alloys make it fit to use in naval engineering. In this paper we discuss properties of aluminium and stainless steel in relation to building a cargo ship and how despite of high cost of aluminium compared to stainless steel, still using aluminium alloy (5083) compared to stainless steel (AISI 316L) can …