Stainless steel 409

Stainless steel 409

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409 stainless steel is a Ferritic steel that offers good mechanical properties and high-temperature corrosion resistance. It is commonly considered as a chromium stainless steel, with applications in exhaust systems of automobiles and applications that demand weldability.

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    • Commodity name: Stainless steel 409

    409 stainless steel is a Ferritic steel that offers good mechanical properties and high-temperature corrosion resistance. It is commonly considered as a chromium stainless steel, with applications in exhaust systems of automobiles and applications that demand weldability.

    Product introduction

    409 stainless steel is a Ferritic steel that offers good mechanical properties and high-temperature corrosion resistance. It is commonly considered as a chromium stainless steel, with applications in exhaust systems of automobiles and applications that demand weldability.
    409 steels are also available in highly stabilized forms, such as grades S40930, S40920 and S40910. The stability of these grades is provided by the presence of niobium, titanium, or both, in the composition of steels.

    Technical data

    Chemical Composition

    Grade C Mn Si P S Cr Ni Ti
    409 min.
    max.
    -
    0.08
    -
    1.00
    -
    1.00
    -
    0.045
    -
    0.045
    10.5
    11.75
    -
    0.5
    6x C
    0.75


    Mechanical Properties

    Grade Tensile Strength (MPa) min Yield Strength 0.2% Proof (MPa) min Elongation (% in 50mm) min Hardness
    Rockwell B (HR B) max Brinell (HB) max
    409 450 240 25 75 131


    Physical Properties

    Grade Density (kg/m3) Elastic Modulus (GPa) Mean Coefficient of Thermal Expansion (μm/m/°C) Thermal Conductivity (W/m.K) Specific Heat 0-100°C (J/kg.K) Electrical Resistivity (nΩ.m)
    0-100°C 0-315°C 0-538°C at 100°C at 500°C
    409 7800 200 11.0 11.7 12.4 25.8 27.5 460 600


    Grade Specification Comparison

    Grade UNS No Old British Euronorm Swedish SS Japanese JIS
    BS En No Name
    409 S40900 409S19 - 1.4512 X6CrTi12 - SUH 409


    Possible Alternative Grades

    Grade Properties
    3CR12 Easy to weld and good corrosion resistance. Heavy sections are more easily available when compared to 409.
    304 High heat resistance and corrosion resistance. Grade 304 is expensive.
    321 Better heat resistance when compared to 304 or 409.
    Aluminized steel Cheaper than grade 409 stainless steel, but less resistant to exhaust gases.

     

    Key words:
    • Stainless steel 409

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