STM A240 Martensitic 409 Stainless Steel Possible Alternative Grades

409 Stainless Steel combines good elevated temperature corrosion resistance with medium strength, good formability, and overall cost. ASTM A240 Martensitic 409is commonly considered as a chromium stainless steel, with applications in exhaust systems of automobiles and applications that demand weld ability.

Key Properties of 409 Stainless Steel
ASTM A240 Martensitic 409 properties given below relate to annealed tubing of ASTM A268. The specified properties may not be similar to other products such as bar and coil.
Composition ranges of grade 409 stainless steels

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 of grade 409 stainless steels

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

ASTM A240 Martensitic 409 Corrosion Resistance
Grade 409 stainless steels have excellent resistance to exhaust gas and atmospheric corrosion。  The surface of grade 409 steels is liable to mild corrosion, which limits the usage of steels for decorative purposes.
409 Steel Application

409 Stainless Steel has been successfully used in Automotive exhaust systems, Catalytic converters, Mufflers, Tailpipes, Farm equipment, Structural support and hangers, Transformer cases, Furnace components, Heat exchanger tubing
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