AL 439HP is similar to the popular alloy Type 439, except for its very low carbon content. The low carbon content of AL 439HP enhances its formability and intergranular corrosion resistance. This datasheet provides information on composition, physical properties, hardness, elasticity, and tensile properties. It also includes information on corrosion resistance as well as forming, heat treating, and joining. Filing Code: SS-829. Producer or source: Allegheny Ludlum Corporation.