Vallourec and Mannesmann (V and M) Tubes T23 is a power plant boiler tubing alloy developed to resist increasing operating parameters of pressure and temperature. This datasheet provides information on composition, physical properties, hardness, elasticity, and tensile properties as well as fracture toughness and creep. It also includes information on forming, heat treating, and joining. Filing Code: SA-507. Producer or source: Vallourec & Mannesmann.