Docol 1300M: A Docol martensitic steel Docol1300M martensitic steel with ultra-high tensile strength helps to improve crashworthiness and provides reliable guarantee for lightweight design and cost-effective production in the automotive industry. Docol is one of the cold-rolled high-strength steels on the market and has become a material for applications such as side anti-collision beams, bumpers and structural parts in the automotive industry.