Functional Improvement of Automotive High Strength Steel Grades by Niobium Microalloying EAEC-07/AE11-3
Authors
Hardy Mohrbacher - Companhia Brasileira de Metallurgia e Mineracao (CBMM)
Abstract
In recent passenger vehicles a broad variety of high strength steel grades has been introduced replacing mild steel grades. Often the share of mild steel is now below 50% of the total body weight and in particular cases even below 30%. Accordingly, the share of high strength steel has significantly increased. The focus has been much on multiphase steels (DP, CP, TRIP) during recent years, which typically account for around 20% of the body weight in current vehicles. The remaining part spectrum is mainly made from microalloyed (HSLA), high strength interstitial free (IF-HSS), bake hardening (BH) and rephosporized (P) steel grades.