Armour Alloys

304/304L Stainless Steel

304 stainless steel is the most commonly used austentic stainless steels used in the world. This material has high corrosion resistance, formability, and weldability when compared with other types of stainless. With a lower nickel content than 316 Stainless, 304 naturally becomes more economical for your production. 


Chemical Composition


Element Type 304 Type 304L
Carbon 0.07 Max 0.030 Max
Manganese 2.00 Max 2.00 Max


0.030 Max 0.030 Max
Phosphorus 0.045 Max 0.045 Max
Silicon 0.75 Max 0.75 Max
Chromium 17.5-19.5 18.0-20.0
Nickel 8.0-10.5 8.0-12.0
Nitrogen 0.10 Max 0.10 Max


Mechanical Properties

Tensile Strength Yield Strength Elongation (2") Rockwell Hardness
84,000 40,000 50% 80



Armour Alloys
Sheet, Plate, Coil
Washing machine tubs, sinks, strainers, food processing equipment, beer barrels, bulk milk coolers, wine storage tanks, store fronts, elevator doors and cabs, laboratory equipment and chemical containers, fume hoods, fire extinguisher parts, heat exchangers
Good resistance to corrosion. They are highly resistant to strong oxidizing acids, such as nitric acid. Intergranular corrosion may occur when material is heated within or cooled through the range of 425°-815°C (800D-1500°F)
Good oxidation resistance in intermittent service to 1600° and in continuous service to 1650°F. Continuous use in the 800 – 1575°F range not recommended but often performs well in temperatures fluctuating above and below this range. Type 304L is more resistant to carbide precipitation and can be used in the above temperature range.
Annealing – Heat to 1850CF – 2050CF, and cool rapidly. Use the low side of the range for intermediate annealing. This grade cannot be hardened by thermal treatment.
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