Böhler (or Boehler) H521 is an alloy with superior high-temperature strength, excellent toughness, and with good resistance to oxidizing, nitrogenous, and low oxygen gases. This datasheet provides information on composition, physical properties, hardness, elasticity, and tensile properties as well as creep. It also includes information on high temperature performance as well as forming, heat treating, machining, and joining. Filing Code: SS-1272. Producer or source: Böhler Edelstahl GmbH.