Non-Hardening, Chrome Nickel Steels
303 – A free machining version of 304 with only slightly less corrosion resistance and physical properties.
304 – The most popular type of stainless, with good corrosion resistance, formability and ease of welding by all common methods.
304L – Lower carbon version of 304, used to minimize carbide precipitation during welding. Physical properties somewhat less than 304.
310 – Heat resistant, with good resistance to thermal fatigue due to cyclic heating. Resists scaling up to 2050oF.
316 – Superior corrosion resistance and higher strength at elevated temperatures than 304. Frequently used in marine applications. Resistant to creep at high temperatures.
316L – Lower carbon version of 316, used to minimize carbide precipitation during welding.