16 / 24 / 30 Gauge Cold Rolled Steel Sheet Coil Ferrite 439 / 1.4509

1.439 stainless steel

Type 439 Stainless Steel is a ferritic stainless steel designed to resist corrosion in a variety of oxidizing environments from fresh water to boiling acids. It may be used in either the annealed, cold formed or as-welded condition in many applications where other stainless steel alloys such as Type 304, Type 410, Type 409 and Type 430are used.

The 439 steel grade is based on the ordinary ferrite material (430) to reduce the content of C, and the addition of stabilizing elements such as Ti, so that the steel species have improved intergranular corrosion resistance, formability and weldability. Compared with the 304 steel grade, the elongation is low (about 30%), but the strength and corrosion resistance are equivalent, and the corrosion resistance is better than the 200 series materials.

chemical composition

Carbon 0.030 max.     Manganese 1.00 max.    Sulfur 0.030 max.
Phosphorus 0.040 max.       Silicon 1.00 max.     Chromium 17.0 – 19.0
Nickel 0.50 max.        Nitrogen 0.030 max.       Aluminum 0.15 max.
Titanium [0.20+4x(C+N)] min. – 0.75 max.

MECHANICAL PROPERTIES

Type Yield Strength 0.2% offset (KSI)

Tensile Strength (KSI) %

Elongation (2″ Gauge length)
439 Ann 30 min. 60 min. 22 min.

 Main purpose

Decoration board for elevator and escalator

Building decoration board, such as decorative structural parts, structural pipe

Automobile exhaust system components

Washing machine inner drum

Progress of  Coil  Cutting line 

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