Hardox
Hardox (AR400), the lightest quench-tempered steel has unique qualities that allow it to be extremely strong and hard-wearing yet still have the ability to be formed without cracking.  This steel is ideal for most applications.
AR400  has an even higher yield strength than hi-tensile steel.  It has a minimum yield strength of 145,000 psi and a Brinell hardness of 400.

Domex
Domex steel is used in situations where you need tremendous strength and extreme forming capabilities. It is processed with special attention to the grain structure of the steel, thus allowing for an unprecedented ability to be easily formed.  This steel is so flexible that is can “practically fold half like paper without cracking”.