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439 Stainless Steel Rolled Coil

Type 439 is a ferritic rolled coil stainless steel that is best suited for use in oxidizing environments, where excellent corrosion resistance is needed. It is often used in place of Type 409 where higher thermal conductivity is required. Type 439 ss also has superior formability capabilities and is heavily used in the automotive industry.

439 stainless steel coil can be used in a variety of applications. It is used primarily for automotive applications.  

439 ASTM Stainless Steel Specifications:

ASTM A240 for annealed condition
ASTM A666 for tempered material*

Composition per ASTM A240
Carbon .030 Max
Manganese 1.00 Max
Phosphorus .04 Max
Sulfur .03 Max
Silicon 1.00 Max
Chromium 17.00 - 19.00
Nickel .50 Max
Nitrogen .030 Max
Mechanical Properties (Annealed, Per ASTM A240)
UTS 60 ksi Min
Elongation % in 2" 22.00 Min
Rockwell Hardness
RB89.00 Max

* Tempered mechanical properties are available upon request.

Common 439 Stainless Steel Applications:


  • Hot water tanks
  • Residential Furnances


  • Difficult-to-form exhaust-system components
  • Tubular manifolds
  • Mufflers

Power generation

  • Heat exchanger tubing

439 Stainless Steel Magnetic Properties:

439 flat rolled stainless steel (ss) is magnetic in all conditions.

Steel Rolled Coil Forming Ability:

Type 439 has outstanding forming abilities even for difficult and unusual shapes.

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