409 ULTRA FORM Stainless Steel

Type 409 ULTRA FORM (UNS S40920) is a ferritic stainless steel that provides improved forming and welding over standard Type 409. In addition, 409 ULTRA FORM SS maintains the same great resistance to corrosion and oxidation as other ferritic steels. 409 ULTRA FORM SS is a trademark product of AK Steel. It is comparable to 409 DDQ, which is also available from North American Stainless.

409 ULTRA FORM stainless steel is used in applications that require complex shapes and weldability.

409 ULTRA FORM Stainless Steel Specifications:

ASTM A240 for annealed condition
ASTM A666 for tempered material*

Composition per ASTM A240
Carbon .03 Max
Manganese 1.00 Max
Phosphorus .04 Max
Sulfur .02 Max
Silicon 1.00 Max
Chromium 10.50 – 11.70
Nickel .50 Max
Nitrogen .03 Max
Mechanical Properties (Annealed, Per ASTM A240)
Elongation % in 2″
Rockwell Hardness

* Tempered mechanical properties are available upon request.

409 ULTRA FORM Stainless Steel Applications:


  • Brake shields
  • Exhaust tubing and stampings
  • Fuel filters
  • Heat exchangers

Magnetic Properties:

409 ULTRA FORM stainless steel is magnetic and cannot be hardened by heat treatment.


Type 409 ULTRA FORM SS can be formed into many shapes without any difficulty.

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