Type 409 (UNS S40920) Stainless Steel

Type 409 (UNS S40920) Stainless Steel

Type 409 (UNS S40920) Stainless Steel Description Type 409 is a heat resisting ferritic stainless steel providing good oxidation and corrosion resistance compared to carbon steel. This titanium stabilized grade was developed for automotive exhaust systems but its good formability, weldability,...
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Type 409 (UNS S40920) Stainless Steel

Description

Type 409 is a heat resisting ferritic stainless steel providing good oxidation and corrosion resistance compared to carbon steel. This titanium stabilized grade was developed for automotive exhaust systems but its good formability, weldability, and corrosion resistance has led to its use in other applications.


The corrosion resistance of Type 409 is better than coated carbon steel, similar to that of Type 410 stainless steel, and less than that of Type 304/304L stainless steel. Type 409 is not suggested for cosmetic or surface critical applications as light surface rusting can form during exposure to atmospheric conditions.


Chemical Composition
Chemical Composition (wt%) limits as specified in ASTM A240 and ASME SA240*.

Element

409

Carbon

0.03

Chromium

10.5-11.7

Nickel

0.50

Manganese

1.00

Silicon

1.00

Nitrogen

0.030

Phosphorus

0.040

Sulfur

0.020

Niobium

8 x (C+N) min / 0.15-0.50

* Maximum, unless range is indicated


Mechanical Properties
Mechanical property requirements for annealed product as specified in ASTM A240 and ASME SA240.

Property

409

Yield Strength, min. (ksi)

25

Tensile Strength, min. (ksi)

55

Elongation, min. (%)

20

Hardness, max. (Rb)

88


Physical Properties
Physical properties for Type 409 stainless steel

Property

409 Data

Density, lb/in3

0.279

Modulus of Elasticity, psi

32.0 x 106

Coefficient of Thermal Expansion, 68-212˚F, /˚F

6.5 x 10-6

Thermal Conductivity, Btu/ft hr ˚F

13.2

Specific Heat, Btu/lb ˚F

0.11

Electrical Resistivity, Microohm-in

24.8


Standards
Typical standards for Type 409 stainless steel

409

ASTM A240

ASME SA240


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