NIROSTA 4521 is a ferritic grade equivalent to AISI type 444. It is a low-carbon, high-chromium (about 18%) alloy also with 2% Mo and minimal titanium. The titanium is added for stabilization, particularly for welded tubing. This datasheet provides information on composition, physical properties, elasticity, and tensile properties. It also includes information on high temperature performance as well as forming, heat treating, machining, and joining. Filing Code: SS-887. Producer or source: ThyssenKrupp Nirosta GmbH.