Journal of Metals, Materials and Minerals

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Quenched and tempered steel are broadly classified as low alloy conventional grades with C contentof 0.15-0.40% and tool steels with C content as high as 2% alloyed with strong carbide forming elementssuch as Cr, V, Mo etc. in the range of 1-12%. In both the cases, steels are used in hardened/quenchedand tempered or auto tempered condition for improved toughness, strength and wear resistance. The C content and tempering temperature are optimized based on desired application. However, achieving high strength/hardness along with adequate toughness is a challenge. The chemistry designis one of the important parts of developing these grades. The judicious amount of hardenability elementslike Mn, Cr, Mo, B etc. are added for achieving required as quenched hardness while excess additionof these elements will not be cost effective. Optimized austenite grain size before quenching is also key to achieve hardenability as well as toughness. All these points have been reviewed systematicallyin this paper for the first time as there is no such review available covering all aspect of quenched and tempered grade. Unlike textbooks or any past review articles, this is a systematic review ofquenched and tempered steel which will help in designingsuitable chemistry and process parametersfor producing different grades of quenched and tempered steel in industrial scale.

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