Grade 439 Stainless Steel

Description

Grade 439 is a titanium-stabilized ferritic stainless steel, designed to improve intergranular corrosion resistance and weldability compared to Grade 430. It contains 17.0-19.0% chromium, providing good corrosion resistance in atmospheric and mild chemical environments, and is magnetic. The addition of titanium (0.10-0.30%) prevents chromium carbide precipitation during welding and high-temperature exposure, eliminating the need for post-weld heat treatment in many applications. 439 offers excellent formability, weldability, and machinability, and has good high-temperature oxidation resistance. It is a cost-effective alternative to austenitic grades for applications where moderate corrosion resistance and good weldability are required. 439 is widely used in automotive exhaust systems, heat exchangers, and industrial components where welded structures are common and intergranular corrosion is a concern.

Chemical Composition (wt%)

C ≤ 0.07, Cr: 17.00-19.00, Mn ≤ 1.00, Si ≤ 1.00, P ≤ 0.040, S ≤ 0.030, Ti: 0.10-0.30, Ni ≤ 0.75

Mechanical Properties

Tensile Strength ≥ 450 MPa, Yield Strength ≥ 205 MPa, Elongation ≥ 22%, Hardness ≤ 183 HB

Advantages

Better intergranular corrosion resistance than 430; excellent weldability (no post-weld heat treatment required in most cases); good formability and machinability; magnetic; cost-effective; good high-temperature oxidation resistance.

Applications

Automotive exhaust systems, heat exchangers, furnace parts, ductwork, welded structures, and general-purpose components in mild corrosive environments.

Equivalent Grades

AISI 439, UNS S43900, EN 1.4510, GB 022Cr18Ti

 

Stainless Steel Suppliers

If you have project requirements for stainless steel, we welcome your order. GNEE has a large inventory of popular products for you to choose from. It can be processed into various practical product forms, including plates, coils, tubes, bars, wires, etc. For detailed chemical composition information and free samples, please contact our factory immediately. We offer competitive prices and excellent service.Email: info@gneestainless.com

 

Testing and Documentation: Factory test certificate, EN 10204 3.1, chemical report, mechanical report, destructive testing report, non-destructive testing report, PMI test report, visual inspection report, third-party inspection report, NABL certified laboratory report.
Packaging: Wooden crate packaging, bubble wrap packaging, steel strapping, or packaging according to customer requirements.