Grade 409L SUH409L Astm Stainless Steel Sheet Thickness 0.6 - 10.0mm

Alloy 409 is a general purpose, chromium, titanium stabilized, ferritic stainless steel whose primary application is automotive exhaust systems. It contains 11% chromium which is the minimum amount for the formation of the passive surface film which gives stainless steels their corrosion resistance. It combines good elevated temperature corrosion resistance with medium strength, good formability, and overall cost. Alloy 409 resists corrosion strongly compared to carbon steel and is used as an alternative to carbon steel in mildly challenging environments where its high resistance to corrosion and high temperature oxidation gives an advantage. It is commonly used in applications where appearance is a secondary quality to mechanical properties and corrosion resistance.

Chemical Composition of 409L Stainless Steel

The typical chemical compositional ranges of grade 409 stainless steels are given below:

Table 1 - Composition ranges of grade 409 stainless steels

Mechanical Properties of 409L Stainless Steel

The table below provides the mechanical properties of grade 409 stainless steels:

Table 2 - Mechanical properties of grade 409 stainless steels

STANDARDS:

• ASTM/ASME: UNS S40900
• EURONORM: FeMi35Cr20Cu4Mo2
• DIN: 2.4660

APPLICATIONS of 409L Stainless Steel

Although Alloy 409 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 Alloy 409 include:

• Automotive exhaust systems
• Catalytic converters
• Mufflers
• Tailpipes
• Farm equipment
• Structural support and hangers
• Transformer cases
• Furnace components
• Heat exchanger tubing