What is 1.4571 Stainless Steel?
Jan 27, 2026
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1.4571 stainless steel, commonly known as 316Ti or UNS S31635, is a titanium-stabilized version of the standard 316 molybdenum-alloyed austenitic stainless steel. The addition of titanium enhances resistance to intergranular corrosion after welding or exposure to high temperatures, making it suitable for welded components and high-temperature applications in chemical, power generation, and marine industries.
This stabilized grade is standardized under key international systems.
| Standard | Equivalent Grade |
|---|---|
| EN (Europe) | 1.4571 |
| ASTM/AISI (USA) | 316Ti, UNS S31635 |
| JIS (Japan) | SUS316Ti |
| KS (Korea) | STS316Ti |
Titanium is added to bind with carbon and prevent chromium depletion at grain boundaries.
| Element | C | Si | Mn | P | S | Cr | Ni | Mo | Ti |
|---|---|---|---|---|---|---|---|---|---|
| Content (%) | ≤ 0.08 | ≤ 1.0 | ≤ 2.0 | ≤ 0.045 | ≤ 0.03 | 16.5 - 18.5 | 10.5 - 13.5 | 2.0 - 2.5 | ≥ 5xC% |
It maintains the good mechanical properties of the 316 family.
| Property | Yield Strength (Rp0.2) | Tensile Strength (Rm) | Elongation (A) | Hardness (HB) |
|---|---|---|---|---|
| Typical Value | ≥ 200 MPa | 500 - 700 MPa | ≥ 40% | ≤ 215 |
Key Characteristics and Applications of 1.4571 / 316Ti
Intergranular Corrosion Resistance: The titanium content prevents chromium carbide formation at grain boundaries during exposure to temperatures between 450-850°C, making it resistant to sensitization.
Good High-Temperature Performance: Suitable for intermittent service up to about 850°C and continuous service to around 750°C, maintaining good oxidation resistance.
Excellent General Corrosion Resistance: Inherits the good resistance of 316 to a wide range of chemicals, acids, and chlorides, with enhanced molybdenum content for pitting resistance.
Primary Applications:
Chemical & Petrochemical: Welded vessels, heat exchangers, and piping systems that cannot be post-weld annealed.
Automotive & Aerospace: Exhaust systems, turbocharger housings, and engine components.
Pharmaceutical: Equipment that undergoes frequent heat sterilization cycles.
Power Generation: Boiler components and superheater parts.
What is the main advantage of using 316Ti (1.4571) over standard 316 (1.4401)?
The primary advantage is its stabilization against intergranular corrosion after welding or high-temperature exposure. Standard 316 can become sensitized in the heat-affected zone of welds or after prolonged service in the 450-850°C range, making it vulnerable to corrosion along grain boundaries. 316Ti's titanium content forms stable carbides, preventing chromium depletion and maintaining corrosion resistance in these conditions. This makes it preferable for heavy welded sections or high-temperature service where post-weld heat treatment is impractical.
Is 316Ti stainless steel magnetic?
Like other austenitic stainless steels, 316Ti is essentially non-magnetic in the annealed condition. However, cold working processes such as cutting, bending, or machining can induce a slight degree of magnetism. This magnetic response is typically weak and varies with the amount of cold work applied.
Looking for a Reliable Supplier of 1.4571 / 316Ti Stainless Steel?
GNEE Steel provides high-quality 316Ti (1.4571) stainless steel in plate, sheet, pipe, and tube forms, suitable for high-temperature and corrosion-resistant welded applications. We ensure material compliance with full certification. If you have any requirements, please feel free to contact us.
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