CarElso 70 SOHIC is a steel alloy with special melt practice producing a pressure vessel material with excellent resistance to stress-oriented hydrogen-induced cracking (SOHIC). This datasheet provides information on composition, hardness, and tensile properties as well as fracture toughness. It also includes information on high temperature performance and corrosion resistance as well as forming and joining. Filing Code: SA-590. Producer or source: Industeel USA, LLC.