Stainless Steel
303 (UNS S30300) is the free-machining grade of 304 with specific limits of sulfur added to produce free-machining characteristics for use in automatic machining operations. Type 303 is a non-magnetic austenitic stainless steel, which is non-hardenable by heat treatment.
304/304L (UNS S30400) is the most common and widely used stainless steel. It is an austenitic stainless steel with non-magnetic properties in the annealed condition that offers good corrosion resistance to both chemical and atmospheric exposures, with a high resistance to oxidation. Type 304/304L has good forming and excellent welding characteristics. It is non-hardenable by heat treatment.
316/316L (UNS S31600) is a chromium-nickel austenitic stainless steel with added molybdenum, which provides greater resistance to corrosion and pitting. It is non- magnetic, and offers higher strength at elevated temperatures. It is non-hardenable by heat treatment.
17-4 PH (UNS S17400) is a precipitation hardenable, martensitic stainless steel that delivers an excellent combination of oxidation and corrosion resistance, and is comparable to 304 in most conditions or environments. Mechanical properties, such as strength and ductility, can be optimized with heat treatment.
