The Study Of The Controlled Cooling Technology Of H-beam And The Simulation Of Online Cooling

H-beam has a reasonable section design and a better bending capacity、plastic、flexible、stable structure、earthquake resistant and impact resistant ability., h-beam is lighter than the ordinary I iron at the same height.So hot-rolled h-beam is especially suitable for an earthquake-prone area which has great prospects for development.Due to uneven cooling at the air cooling after rolling,web waves and cracks seriously when sawing. Therefore, we need to impover the controlled cooling of h-beam after rolling urgently in order to enhance its strength and decrease the deformation. There is a good way to reduce the residual stress by controlling temperature difference of h-beam on the cooling process reasonably.it makes organization more subtly on the process of shifting ustenite to ferrite in order to enhance its strength.Taking h-beam as the research object, based on the basic theory of heat transfer, by consulting a large number of relevant materials of controlled cooling,selecting the three kinds of the representative controlled cooling craft of h-beam, determining the relatively reasonable boundary conditions and initial conditions,we establish the two-dimensional、variable physical properties and transient finite element model of h-beam. We simulate the controlled cooling process of h-beam by Ansys Workbench and obtaine the curve when the maximum temperature and minimum temperature of h-beam with the change of time at the different controlled cooling scheme,we analyze the residual stress of the h-beam and verify the different controlled cooling scheme by the experiment.Experiments show: the simulation values are consistent with experimental values and research the microstructure of h-beam on the basis of the experiment. So we find out the reasonable online heat treatment plan. We divide h-beam into six by average and simulate the dynamic process of online cooling h-beam by static segmented method.We observe the temperature and stress changes of the whole h-beam and the temperature changes of the middle position(Z = 3 m) of h-beam by changing the flow density. Finally,we find a better controlled cooling scheme which is the flange、web and R Angle of h-beam. We solve the large residual stress and the thick organization of h-beam and implement the online cooling of h-beam and have the certain reference value for improving the performance of h-beam.