Armour Alloys

409 Stainless Steel

409 Stainless Steel  is a stabilized ferritic stainless steel with better oxidation and corrosion resistance than carbon steel. It's low nickel and high carbon content make it one of the most economical stainless steels available. Like other 400 grade stainless steel, 409 is magnetic. Common uses for 409 Stainless include exhasuts, agricultural spreaders, heat exchangers, and exhaust silencers.


Chemical Composition

Element Type 409
Carbon 0.08
Manganese 1.0
Phosphorus 0.040
Sulfur 0.030
Silicon 1.0
Cromium 10.5-11.75
Titanium 0.5-0.75


Mechanical Properties

Tensile Strength Yield Strength Elongation (2") Rockwell Hardness
65,000 35,000 25% 75


Armour Alloys
Sheet, Plate, Coil
Structural applications, exhaust equipment, agricultural equipment, silencers, Heat Exchangers, Fuel Filters.
Resists atmospheric and automotive exhaust gas corrosion. A light surface rust can form in most atmospheres. This rust retards progressive corrosion but makes the surface undesirable for decorative applications.
Good resistance to scaling in intermittent service to 1425°F and in continuous service to 1400°F.
Annealing – Heat to 1400°F – 1500°F, and air cool. 409 grades cannot be hardened by thermal treatment. Voidability Roadlly welded but a preheat of 150° – 260°C (300° – 500°F) is recommended.
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