ASTM A268 TP409 , UNS S40900 , EN 1.4512 welded stainless steel
409 is a low cost ferritic stainless steel. Its dominant use is in
vehicle exhaust systems,
so much so that it is often referred to as “muffler” grade.
This TP409 stainless grade combines the following characteristics:
- Basic corrosion and oxidation resistance
- Composition balanced for optimum formability
- Weldable only in thin sections due to fully ferritic structure
- Low cost and limited cost variation due to low alloy content
Automotive exhaust systems have to withstand aggressive conditions
from high temperatures
at the manifold end, sulphuric acid condensate and de-icing salt.
Given the severity of these conditions,
it can seem surprising that the 11% Cr 409 grade has met the
challenge for many years.
Exhaust components are also required to be bent, expanded and
pressed into all sorts of convoluted shapes.
The ability of a ferritic steel to meet these formability
requirements is little short of amazing.
Heat exchangers, gas boilers, fuel filters.
Chemical composition ( weight % )
|TP409, UNS S40900||0.08 max||1.00 max||1.00 max||0.045 max||0.030 max||10.5~11.7||0.5 max||6*C min, 0.75 max|
|Tensile strength||Yield strength||Elongation|
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