303 stainless steel is an austenitic free-cutting stainless steel that is wear-resistant and acid-resistant. To improve the performance of the steel, no more than 0.60% molybdenum can be added to the steel to make it resistant to ablation.

303 is a free-cutting stainless steel containing sulfur and selenium, respectively. It is used in applications where free-cutting and a high surface finish are key requirements. 303 stainless steel improves cutting performance and resists high-temperature bonding. It is suitable for automatic lathes, bolts, and nuts.