Stainless Steel 409 1.4512

 

 

 

Chemical Compositions*

Element	% Present (in product form)
Carbon (C)	0.030
Silicon (Si)	1.00
Manganese (Mn)	1.00
Phosphorous (P)	0.040
Sulfur (S)	0.015
Chromium (Cr)	10.50 - 12.50
Molybdenum (Mo)	6 x (C+N) to 0.65
Iron (Fe)	Balance

 

Q: What is the core chemical composition of Stainless Steel 409 (1.4512)?

A: It is a titanium - stabilized ferritic stainless steel (EN X2CrTi12, UNS S40900), typically with ≤0.03% C, 10.5-12.5% Cr, ≤1.0% Mn, ≤1.0% Si, 0.15-0.75% Ti, ≤0.045% P, ≤0.030% S, and ≤0.5% Ni.

 

Q: What are its key properties?

A: It has good weldability (titanium prevents intergranular corrosion post - welding), decent formability, oxidation resistance up to 750°C, and is magnetic. Its density is 7.75 g/cm³, tensile strength 380-450 MPa, yield strength 170-240 MPa, and elongation ≥20% (annealed).

 

Q: What are the typical applications?

A: Known as "muffler grade", it is widely used in automotive exhaust systems (manifolds, mufflers). It also applies to rail/road vehicle parts, heat exchangers, and sugar industry transport equipment.

 

Q: How does it differ from 304 stainless steel?

A: 409 (1.4512) is ferritic, magnetic, nickel - free (low cost), has lower corrosion resistance (weaker in chlorides), while 304 is austenitic, usually non - magnetic, has 8% Ni for better corrosion resistance, and is more expensive.

 

Q: What are its limitations and alternatives?

A: It is not suitable for highly corrosive (e.g., coastal) environments. Alternatives like 439 (1.4510) or 436L (1.4513) offer better oxidation/corrosion resistance for demanding exhaust applications.