High strength steels S.J.T.U. Phase Transformation and Applications BMW 3 Series/a body structure weighing 230 kg with a high- strength steel content of 50%/The previous less than 5% M8E]4548 The new Mercedes-Benz S-Class uses 38%high-strength steel/a lower body weight an increase in torsional stiffness of 70%/improved crash performance. S1R8779 2006? SJTU Thermodynamics of Materials Spring 2010 @X.J.Jin Introduction 21/65Phase Transformation and Applications S. J. T. U. SJTU Thermodynamics of Materials Spring 2010 © X. J. Jin Introduction 21/65 High strength steels BMW 3 Series / a body structure weighing 230 kg with a high￾strength steel content of 50% / The previous less than 5% The new Mercedes-Benz S-Class uses 38% high-strength steel / a lower body weight / an increase in torsional stiffness of 70% / improved crash performance. 2006?