Study On Technology And Property Of Q390and Q345B Steels By Induction Tempering

Traditional tempering has been decided to iron and steel materials, especially steelplate materials are appropriate to reduce the strength, to improve the ductility, toughness.This paper studies Q390steel and Q345B steel typical low-carbon alloy steel, inductiontempering, aimed at discovering and different induction tempering with the traditionaltempering, to provide guidance for industrial practice.Q390steel in a Iron and Steel Group to take the actual production of the Q390finished steel plate. After quenching at620℃for60min traditional tempering and10s,40s,300s,600s duration of the different thermal simulation machine inductiontempering, and then air-cooled. Finally, the-40℃and-100℃Charpy V-notchlow-temperature impact test. After more than a series of experiments, hardness testing,the fracture scanning and metallographic microstructure observation, the followingconclusions can be drawn: the induction tempering better than the traditional temperingof5-10%in the low temperature toughness, induction tempering the average impactsuccessfully171J traditional tempering the average impact energy of162J; inductiontempering40s best,-100°C impact value is2times more than the traditional tempering,induction tempering, the average impact energy of85J, the traditional tempering theaverage impact energy of38J. Hardness slightly lower than the traditional tempering thetraditional tempering HRB mean73.2,10s induction tempering HRB mean is71.1;40sinduction tempered HRB mean71.6;300s induction tempering HRB mean72.6;600ssensor back fire HRB mean of71.6.Q345B steel, in an Iron and Steel Group to take the actual production of the Q345Bfinished steel plate. Quenching after tempering at620℃for60min traditional temperedand self-made electromagnetic induction device is non-contact at different times,different temperatures and heating methods, and then air-cooled. Finally, the impact ofthe-100℃Charpy V-notch low-temperature experiments. After more than a series ofexperiments, hardness testing, the fracture scanning and metallographic microstructureobservation, we can draw the following conclusions: induction tempering at lowtemperature toughness is slightly worse than traditional tempering, induction temperingtemperature to377.4℃, the average absorbed energy for≥124.9J; heated to337.0℃,the average induction tempering absorbed energy is≥270.0J; heating to480.9℃induction tempering the average absorbed energy≥258.5J, the traditional tempering of450℃, the average absorption successfully the≥268.1J. Hardness of5-10%higher than the traditional tempering.