Materials · Metal

Stainless Steel 304

A general-purpose austenitic stainless steel used for corrosion-resistant fabricated and machined components.

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Prepared by Bertrand Mezatio

Mechanical engineering perspective focused on CAD, DFM and manufacturing. Values are educational starting points, not procurement specifications.

Why engineers choose Stainless Steel 304

304 is widely available and combines corrosion resistance, formability and weldability. It is common in food equipment, enclosures, fasteners, brackets and general industrial hardware.

Manufacturing routes

Stainless Steel 304 is commonly encountered in Sheet metal · machining · forming · welding. The process route matters because material condition, anisotropy, tolerances, surface finish and residual stress can differ substantially between molding, machining and additive manufacturing.

Design considerations

Machining requires attention to work hardening and tool strategy. Sheet parts need realistic bend radii and springback allowance. Avoid crevices where corrosion or cleaning requirements are critical.

Environment and durability

304 performs well in many atmospheric and wet environments but is less resistant to chlorides than 316-family stainless steels.

Relative engineering profile

These 1–5 ratings are deliberately qualitative. They help shortlist materials but must not replace grade-specific datasheets, testing or supplier guidance.

Relative stiffness
5/5
Toughness
5/5
Heat capability
4/5
UV/weather
5/5
Moisture resistance
5/5

What to compare before specifying it

Compare 304 with 316L for chloride/chemical exposure, carbon steel for lower cost, and aluminum when mass is a major constraint.

Specification note: Material names such as ABS, PA6, 316L or Ti-6Al-4V describe families or alloy designations, not a complete purchasing specification. Grade, temper/condition, reinforcement, colorant, certification, processing route and supplier data can materially change performance.