304 vs 316 Stainless Steel: Which Should You Choose?

The short answer: 304 stainless steel is a practical choice for many general fabrication and workshop jobs. Choose 316 when the part needs greater resistance to corrosion, particularly in coastal or other chloride-exposed environments. The right grade depends on where the finished part will be used, how it will be cleaned and how long it needs to last.

If you’re ordering stainless steel bar or tube for a project in Australia, the choice often comes down to 304 or 316. Both are useful, widely specified grades. Understanding the difference helps you buy the material your job actually needs.

What is the difference between 304 and 316?

The main difference for many buyers is corrosion resistance. Grade 316 contains molybdenum, which improves its resistance to certain forms of corrosion, especially pitting and crevice corrosion caused by chlorides.

That does not mean 316 is corrosion-proof. Salt exposure, trapped moisture, surface finish, cleaning practices and the design of the finished part all affect performance.

When should you consider 304 stainless steel?

304 is often a sensible starting point for general fabrication, workshop equipment, brackets, fittings and components used in relatively mild environments.

For example, if you’re machining a part for indoor equipment or fabricating a component that will be kept clean and away from heavy salt exposure, 304 may meet the job’s requirements.

See our 304 and 316 stainless steel range to compare available profiles and sizes.

When should you consider 316 stainless steel?

Consider 316 for parts exposed to coastal air, salt spray or other conditions where chloride corrosion is a concern. It is commonly considered for marine-related projects and equipment used in more demanding environments.

If a component is critical, permanently exposed or subject to a particular industry specification, check the design requirements before selecting a grade. The environment and specification matter more than a general rule of thumb.

Does the shape matter too?

Yes. Once you’ve chosen a grade, select the profile that suits the part:

• Round bar for turning, pins and machined components

• Flat bar for brackets, straps and mounting pieces

• Square bar for fabrication and machined parts

• Tube for hollow components and fabricated assemblies

Check the required diameter or section size, wall thickness for tube, and cut length before ordering.

Can you buy only the length you need?

Yes. Cut Length Metals supplies 304 and 316 stainless steel cut to length, with no minimum order quantity. That means you can order a piece for a repair or a batch for ongoing work without automatically buying full commercial lengths.

Based in Caboolture, Queensland, we supply customers across Australia. Explore stainless steel cut to size, or contact us if you need help choosing a profile or requesting a particular cut length.

Need 304 or 316 stainless for your next job? Tell us the grade, profile, size, quantity and length you need, plus where the finished part will be used.