UNS S40900 – Titanium-Stabilized Ferritic Alloy for Cost-Effective High-Temp Applications

Overview

UNS S40900 is a low-chromium, titanium-stabilized ferritic stainless steel renowned for its excellent cost-performance ratio and reliable high-temperature oxidation resistance. As a ferritic grade, it exhibits magnetic properties and good thermal conductivity, distinguishing itself from austenitic stainless steels. The titanium addition stabilizes the alloy, preventing intergranular corrosion and enhancing weldability, making it easy to fabricate via cutting, forming, and welding processes. It is primarily designed for applications requiring moderate corrosion protection and high-temperature stability, serving as a cost-effective solution in automotive and general industrial fields where budget and basic performance are key considerations.

Chemical Composition (wt%)

C ≤ 0.08, Cr: 10.50-11.75, Ti: 0.15-0.35, Mn ≤ 1.00, Si ≤ 1.00, P ≤ 0.045, S ≤ 0.030, Ni ≤ 0.50, N ≤ 0.030

Typical Mechanical Properties (Annealed Condition)

Tensile Strength (Rm): ≥ 448 MPa; Yield Strength (Rp0.2): ≥ 238 MPa; Elongation (A): ≥ 33%; Brinell Hardness (HB): ≤ 183

Core Advantages

Cost-effective with moderate corrosion resistance; titanium stabilization prevents intergranular corrosion and improves weldability; excellent high-temperature oxidation resistance (up to 760°C); good formability similar to carbon steel; magnetic with high thermal conductivity; suitable for mass production with low material costs.

Applications

Automotive exhaust systems (manifolds, mufflers, tailpipes, catalytic converters), home heating systems, heat exchanger tubing, electrical transformer cases, architectural trim, and general industrial components in mild corrosive environments.

Equivalent Grades

EN 1.4512, AISI 409, GB 022Cr11Ti, SUS409L

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.