JMS_V4_N2_RP2 Sanjeev Katoch Rakesh Sehgal Vishal Singh Journal on Material Science 2347–615X 4 2 9 18 Cryogenics Treatment, Tool Steels, Hot Die Steel, Vacuum Heat Treatment, Retained Austenite, Tensile Strength, Impact Strength In this paper, an effort has been made to investigate the influence of Deep Cryogenic Treatment (DCT) on the mechanical properties of hot die steel grade AISI H13. DCT has been performed at -154 °C for 6, 21, and 36 hours and tempered for 2 hours at 620 °C. The mechanical properties obtained after DCT and conventional vacuum heat treatment have been characterized with a distinction to comprehend the influence of cryogenic treatment vis-à-vis vacuum heat treatment and tempering on the hardness, tensile strength, % elongation, and toughness (in Charpy Vnotch Impact Test (CVN)). The results show that cryogenically treated samples viz. ATC1 (6) T have 3.1% higher hardness, 36% higher toughness (CVN) and 46% higher percentage elongation than A3T treated samples respectively, while the tensile strength varied cryogenically treated samples show the reduction in tensile strength by 12.8%, in comparison to A3T treated samples. Field emission scanning electron microscopy has been used for the study of the morphology of microstructure and fractured surfaces. July – September 2016 Copyright © 2016 i-manager publications. All rights reserved. i-manager Publications http://www.imanagerpublications.com/Article.aspx?ArticleId=8125