304 / 304L Stainless Steel Bar Stock

304 and 304/L (UNS S30400 & UNS S30403) are austenitic alloys of stainless steel bars. These alloys are the most familiar and most frequently used alloys in the stainless steel family.  The L in 304/L refers to a lower carbon content to allow for greater corrosion protection when welding.

Available shapes: Hexes, Rounds, Square

Specifications: ASTM A276, ASTM A479, ASME SA479 & AMS 5639.

Shop 304 / 304L Stainless Steel Bar
Typical Chemical Properties
Minimum Properties
Tensile Strength , psi 75,000 70,000
Yield Strength, psi 30,000 25,000
Elongation 40% 40
Hardness Rb 92 max Rb 92 max
Carbon( C) .08 max 0.03 max
Chrome (Cr) 18.0-20.0 18.0-20.0
Manganese (Mn) 2.00 max 2.00 max
Nickel ( Ni) 8.0 - 10.50 8.0 - 12.00
Phosphorus (P) .045 max .045 max
Sulphur (S) .030 max .030 max
Silicon (Si) 0.75 max 0.75 max

Austenitic steels have austenite as their primary phase (face centered cubic crystal). These are alloys containing chromium and nickel (sometimes manganese and nitrogen), structured around the Type 302 composition of iron, 18% chromium, and 8% nickel. Austenitic steels are not hardenable by heat treatment. The most familiar stainless steel is probably Type 304, sometimes called T304 or simply 304. Type 304 surgical stainless steel is austenitic steel containing 18-20% chromium and 8-10% nickel.

Shop 304 / 304L Stainless Steel Bar Stock

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