439 Stainless Steel Plate


439 stainless steel is based on the general ferrite material (430) on the basis of reducing the C content, while adding Ti and other stabilizing elements, so that the steel's resistance to intergranular corrosion, formability and weldability have improved. Compared with the 304 steel, the elongation is low (about 30%), but the strength, corrosion resistance and corrosion resistance is better than 200 series materials.


Oxidation resistance and corrosion resistance superior to Type 409 make Steel 439 attractive for numerous automotive exhaust applications. Suggested applications include tubular manifolds and other exhaust system areas where temperatures may exceed the oxidation limit of Type 409 or where aqueous corrosion resistance, particularly to chlorides, is needed. Steel 439 is a ferritic stainless steel that outperforms Type 409 in both oxidation resistance and corrosion resistance. Special adjustment to chemical composition combined with special processing give this alloy excel- lent formability that is reproducible, coil after coil and heat after heat. This provides special advantages when producing difficult-to-form exhaust system components.


Chemical Composition:


ASTM4390. 19.0≤ 0.5≤ 0.040.2+4(C+N)-1.10



Mechanical Properties:

 Tensile StrengthYield StrengthElongationHardness
ASTM 439≥41520522180
DIN 1.4510420-60023023 




Decorative panels for elevators and escalators

Building decorative panels, such as decorative structural parts, structural pipes

Automotive exhaust system components

Washing machine inner tube

Related 400 Series Stainless Steel Bar Materials