Lukens LT-75HS is a quenched and tempered, fine grain, notch-tough, carbon steel having good impact and notch-toughness properties. It is engineered specifically for use in pressure vessel and structural applications requiring high strength properties and guaranteed notch toughness. This datasheet provides information on composition, physical properties, hardness, elasticity, and tensile properties as well as fracture toughness. It also includes information on low and high temperature performance as well as forming, heat treating, and joining. Filing Code: CS-28. Producer or source: Lukens Steel Company.