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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, although the elongation is low (about 30%), the strength and corrosion resistance are equivalent.
Grade and Main Chemical Composition%
|Grade||YS(Mpa) ≥||TS (Mpa) ≥||El (%) ≥||Hardness(HV) ≤|
Elevator, escalator decorative board，Building decorative panels, such as decorative structural parts, structural tubes，Automotive exhaust system components，Washing machine inner tube.