Hot formed steels*,***This chapter has been derived from ‘Metallurgy of Steels and Blank Materials. In: Hot Stamping of Ultra High-Strength Steels, From a Technological and Business Perspective’ Billur, E. 2017. With permission of Springer.**Every effort has been made to trace copyright holders and to obtain their permission for the use of copyright material. The publisher apologizes for any errors or omissions in the acknowledgements printed in this book and would be grateful if notified of any corrections that should be incorporated in future reprints or editions.