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409 stainless steel
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409 stainless steel

409 Stainless Steel (UNS S40900) is a stabilized ferritic stainless steel that provides improved oxidation and corrosion resistance compared to carbon steel. Ease of fabrication combined with its corrosion resistance and economy have significantly broadened its utilization in automotive exhaust and other non-automotive applications. 409 stainless steel apply to automobile mufflers, catalytic converters, tailpipes, farm equipment, structural supports and hangers, transformer cases, diamond tread plate and shipping containers.

409 stainless steel

409 stainless steel chemical composition max

Grade C Mn S P Si Cr Ni Nb Ti
409 0.03 1.00 0.02 0.04 1.00 10.5-11.7 0.50 0.17 0.50

409 stainless steel mechanical properties

Material Yield strength 0.2% offset ksi Tensile strength Ksi %elongation(2” gauge length ) Hardness Rockwell
409 25 min 55 min 20min HRB 88max

409 stainless steels Physical properties (annealed)

Grade Density (kg/m3) Elastic Modulus (GPa) Mean Coefficient of Thermal Expansion (µm/m/0C) Thermal Conductivity (W/m.K) Specific Heat 0-1000C (J/kg.K) Electrical Resistivity (nΩ.m)
0-1000C 0-3150C 0-5380C at 1000C at 5000C
409 7800 200 11.0 11.7 12.4 25.8 27.5 460 600

409 stainless steel Corrosion Resistance

Grade 409 stainless steels have excellent resistance to exhaust gas and atmospheric corrosion, superior to that of 410 martensitic grades with 12% chromium and 3CR12. However, the corrosion resistance is lower than that of grade 430 steels containing 17% chromium. The surface of grade 409 steels is liable to mild corrosion, which limits the usage of steels for decorative purposes. Katalor is the 409 stainless steel plate,409 stainless steel sheet,409 stainless steel pipe,409 stainless steel coils supplier, if you need 409 stainless steel,contact us!

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