Grade 439 Stainless Steel – Titanium-Stabilized Ferritic Alloy For Welded Applications

Overview

Grade 439 is a titanium-stabilized ferritic stainless steel, designed to enhance weldability and prevent intergranular corrosion in welded components. It contains 17.0-19.0% chromium and titanium (0.10-0.30%), which forms stable carbides to prevent chromium depletion during welding. Unlike non-stabilized ferritic grades, Grade 439 offers excellent weld integrity without post-weld annealing, making it suitable for large welded structures. It is magnetic, has good formability and thermal conductivity, and provides better corrosion resistance than Grade 430, serving as a cost-effective choice for welded industrial components.

Chemical Composition (wt%)

C ≤ 0.07, Cr: 17.00-19.00, Ti: 0.10-0.30, Mn ≤ 1.00, Si ≤ 1.00, P ≤ 0.045, S ≤ 0.030, Ni ≤ 0.75

Typical Mechanical Properties (Annealed Condition)

Tensile Strength (Rm): ≥ 450 MPa; Yield Strength (Rp0.2): ≥ 240 MPa; Elongation (A): ≥ 20%; Brinell Hardness (HB): ≤ 183

Core Advantages

Titanium-stabilized to prevent intergranular corrosion in welds; no post-weld annealing required; good weldability and formability; magnetic with excellent thermal conductivity; better corrosion resistance than Grade 430; cost-effective for welded structures.

Applications

Welded heat exchangers, boiler components, automotive exhaust systems, industrial piping, and large welded structural parts in mild corrosive environments.

Equivalent Grades

EN 1.4510, UNS S43900, GB 022Cr18Ti, SUS439

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.