Type 303 stainless is a free-cutting material, with the best machinability of any austenitic stainless steel. Machinability, heat treatment, weldability – these are all important factors in the type of stainless steel you use for your application. Type 304 stainless steel boasts incredible toughness and corrosion resistance but is susceptible to pitting in situations such as warm chloride-based environments. However, type 303 has a composition that’s been altered to increase machinability, so it’s weakened to corrosion resistance compared with grade 304. Stainless steel in general is naturally corrosion resistant. There are several factors that come into play when choosing the type of stainless steel to use. Type 304 stainless is austenitic and non-magnetic, meaning it also provides low thermal and electrical conductivity.ĭeciding whether to use grade 303 vs 304 stainless steel often comes down to determining what the application will be. Its low carbon content makes it ideal for welding operations common to the construction industry, among others. Grade 304 stainless is among the most popular alloys due to its incredible corrosion resistant properties. The added sulfur decreases corrosion resistance of grade 303 when compared to grade 304, but for certain applications the machinability is worth the trade-off. Grade 303 stainless steel is similar to grade 304 stainless, but with sulfur added to help increase machinability while maintaining both corrosion resistance and mechanical elements that are associated with stainless steel. What is the Difference Between 303 and 304 Stainless Steel? Below, we review the differences between grades 303 vs 304 stainless steel. That said, stainless steel is broken down into different grades, each with slightly varying characteristics based on the chemical makeup. Stainless steel is a property notorious for its corrosion resistance and remarkable ability to resist stains.
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