• Inox 409 contains 11% chromium which is the minimum amount for the formation of the passive surface film which gives stainless steels their corrosion resistance. 409 Coil combines a good elevated temperature corrosion resistance with medium strength, good formability, and overall cost.
• Grade 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.
Packing stander
Steel grades | 409 |
Production | cold rolled |
Thickness | 0.2-3.0mm |
Width | 1219mm,1240mm |
Standard size: | 1219*2438mm |
Edge | Mill and slit |
Finishes | 2B |
packing | Water-proof wooden package |
Application | Engine and exhaust systems of automobiles,paddle wheel, |
Payment terms | T/T and L/C at sight |
Equivalents
409-S40900-1.4512
Typical Applications
409 stainless steel is designed principally for the automotive exhaust industry, it has been successfully used in other industrial applications as well. Some examples of applications that call for 409 stainless steel include:Automotive exhaust systems, Catalytic converters, Mufflers, Tailpipes, Farm equipment, Structural support and hangers, Transformer cases,Furnace components,Heat exchanger tubing.
Chemical composition
Grade | %C | %Mn | %Si | %S | %P | %Cr | %Ni |
409 | 0.08 | 1.00 | 1.00 | 0.045 | 0.045 | 10.5-11.75 | 0.5 |
General 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.
Cold rolled
409 stainless steel has good formability characteristics with useful mechanical properties. Its good ductility allows it to be readily formed by bending and deep drawing. Grade 409does not undergo significant work hardening when is cold rolled.
Welding
Grade 409 steels must be pre-heated to temperatures of 150 to 260°C before welding. Although grade 430 and 409 filler rods or electrodes can be used during welding of grade 409 steels, grade 309 electrodes or filler rods are strongly recommended by AS 1554.6. Care should be taken to weld grade 409 steels with minimum heat, in order to mitigate grain growth.
