What Is 17-4PH Steel Bar? Properties & Uses Explained

17-4PH stainless steel, also known as UNS S17400 or DIN 1.4542, is a precipitation-hardening martensitic stainless steel. It offers an excellent combination of strength, hardness, corrosion resistance, and machinability—making it highly popular in demanding industries like aerospace, medical, and defense. Chemical Composition & Mechanical Properties Element Typical Content (%) Chromium (Cr) 15.0–17.5 Nickel (Ni) 3.0–5.0 […]