December 2020 | Volume 39 | Issue 2 | Page 164 Journal of Engineering and Applied Sciences Research Article Introduction C old heading quality (CHQ) steel is a kind of raw material and mostly manufactured from pure ore of iron and appropriate steel scrap within controlled process conditions, which ensures minimum content of metal residuals, uniform chemical composition and clean steel. CHQ steel found its attention in Automotive and diferent machine parts as well, for instance shaft, gear screw, fasteners, studs, spline socket, connecting rod and rivets, etc. (Chandio and Abro, 2018). Rapid austenizing, (Up-quenching) refnes the grain size of austenite; it avoids distortion produced in components and particularly in micro-alloy grained martensitic homogenously distribute the tiny carbide particles matrix (Abro et al., 2019, 2020). It reduces other heat treatment parameters i-e tempering, soft annealing etc. (Abro et al., 2019). Uniform temperature produces adequate heat treatment as resultant steel becomes ultrafne grained martensitic matrix (Ghaferi et al., 2019). Vast researchers examine CHQ steel but no one explained the austenitic phase transformation applying up-quenching technique (Abro, 2016). Moreover, lots of researcher demonstrates various Abstract: Continuous heating phenomena performed at lead bath-quenching in which austenitic development morphology investigated.Te CHQ steel analyzed in the context of Advanced Optical Microscope of Olympus GX51, SEM and Tin-flm X-ray Difracto-meter, with high-intensity mode have been deployed in order to examine the kinetics behavior of austenitic development at CHQ steel. On several quenching experiments the austenite formed at diferent temperatures and time 10s, 15s, 30s, and 60sec and 800°C 710°C, 740°C, 770°C respectively. Initial microstructure for both the steel is ferrite and pearlite. AC 1 temp: is assumed to be 740°C and AC 3 temperature 800°C has been examined methodically. Te soaking time and holding temp: play an important role in developing of gamma-austenite. Mostly ferrite and cementite morphology exist at nucleation sites. At ferrite-ferrite grain interface the austenitic nucleation is not found. At high temperatures, the development of austenite at pearlitic nearby areas are highly noticed. At 800°C growth is about fnger- type morphology. Te fngers are parallel to pearlite so it is strongly believed that within this area the bainite structure is to be formed. Tis bainite is assumed to be austenite before cooling. Shahid Hussain Abro 1 *, Mohammed N. Alghamdi 2 , Muhammad Sohail Hanif 3 , Hazim Moria 2 and Hamza Suharwardi 1 1 Department of Metallurgical Engineering, NED University of Engineering and Technology, Pakistan; 2 Department of Mechanical Engineering Technology, Yanbu Industrial College, Kingdom Saudi Arabia; 3 Department of Materials Engineering, NED University of Engineering and Technology, Pakistan. Received: August 21, 2020; Accepted: November 24, 2020; Published: December 19, 2020 *Correspondence: Shahid Hussain Abro, Department of Metallurgical Engineering, NED University of Engineering and Technology, Pakistan; Email: engrabro@neduet.edu.pk Citation: Abro, S.H., M.N. Alghamdi, M.S. Hanif, H. Moria and H. Suharwardi. 2021. Microstructure integration upon heating temperatures in low carbon Mn steel. Journal of Engineering and Applied Sciences, 39(2): 164-169. DOI: http://dx.doi.org/10.17582/journal.jeas/39.2.164.169 Keywords: Up-quenching, CHQ steel, Austenite, Phase transformation, Microstructure, Lead-Bath, Heating rate Microstructure Integration Upon Heating Temperatures in Low Carbon Mn Steel