Reasearch On Manufacturing Technology Of Bake Hardening Steel

Automobile is an indispensable means of transportation because of its convenience and rapidity in people's life nowadays.With the development of automobile manufacturing today,safety,environmental protection and light weight have become the development trend of automobile industry.The biggest factor affecting the weight loss of automobile is the weight of automobile steel plate.Therefore,in order to ensure the safety of the premise of manufacturing lightweight high-strength steel,as the first priority of the development of various steel manufacturers.The baking hardening steel is one of the most important lightweight high strength steel plates.This paper first describes the characteristics of bake hardening steel,that is,steel plate has lower yield strength and is easy to press and form after rolling and annealed,while the yield strength increases after baking and coating,so it has higher strength and greatly improves the impact resistance.By the methods of contrast experiment,discusses the baking time,pre deformation on the bake hardenability value,the influence of the bake hardenability value will be bigger as the baking time increased and the baking hardening value reached the maximum when the predeformation was 2%.In this paper,the recrystallization kinetics,dissolution and precipitation law,recrystallization texture and distribution of solid solution elements of baking and hardening steel were studied by comparing several groups of experimental steels.It is concluded that the presence of vanadium can accelerate the recrystallization rate,increase the bake hardening value and reduc e the recrystallization grain size.Obtained at the same time containing vanadium bh at lower annealing temperature and annealing time is shorter under the condition of,can obtain relatively high intensity of {111} texture and relatively low intensity of {100} texture,so that vanadium bake hardening steel at relatively low annealing temperature and annealing time is relatively low,is advantageous to improve deep drawing performance.Finally,according to the conclusions obtained in this paper,after the production process design and the actual production in the factory,the baking and hardening steel of 180 BH and other strength levels were successfully produced,and the factors affecting the uniformity of product performance and causing the poor shape of the steel plate were analyzed.