Stainless Steel 316Ti (UNS S31635)
Stainless Steel 316Ti is a titanium-stabilized version of the 316 molybdenum-bearing austenitic stainless steel. While 316L achieves its corrosion resistance through low carbon content, 316Ti uses a strategic addition of Titanium to stabilize the structure. This makes it exceptionally resistant to intergranular corrosion after heating in the 800° F to 1500° F (425° C to 815° C) carbide precipitation range.
At Aries Alloys, we supply 316Ti to industries where components must endure prolonged high-temperature exposure without sacrificing the elite pitting resistance that the 316 series is known for. It is the material of choice for heavy-wall welded structures that cannot be easily annealed after fabrication.
Key Performance Benefits
- High-Temperature Stabilization: The titanium content prevents chromium depletion at the grain boundaries, maintaining corrosion resistance at elevated temperatures.
- Superior Pitting Defense: Retains the high molybdenum content (2.0-2.5%) necessary to resist pitting and crevice corrosion in chloride-rich environments.
- Enhanced Mechanical Strength: Offers better tensile and yield strength at higher temperatures compared to the extra-low carbon 316L grade.
- Exceptional Weldability: Can be welded using most standard processes without the risk of sensitization in the heat-affected zone (HAZ).
- Excellent Fabricability: Highly adaptable to cold forming, deep drawing, and spinning, despite the increased hardness from titanium carbides.
Material Science & Data
The Titanium Effect:
The secret to 316Ti is the "stabilizing" reaction where titanium preferentially combines with carbon to form Titanium Carbides. This reaction is much more stable than the formation of chromium carbides, ensuring that the chromium remains distributed throughout the metal to maintain the protective passive film.
Mechanical & Physical Data:
- Density: 8.0 g/cm^3
- Non-Magnetic: Remains non-magnetic in the annealed condition.
- Oxidation Resistance: Good resistance to scaling in intermittent service to 1600° F (870° C) and continuous service to 1700° F (925° C).
- Comparison: While 316L is often used for its ease of fabrication in thinner sections, 316Ti is typically preferred for thicker sections and higher temperature service.
Primary Industrial Use Cases
Aries Alloys is a key supplier of 316Ti for high-stress chemical and thermal environments:
- Petrochemical Refineries: Heat exchangers, refinery equipment, and process piping exposed to high temperatures.
- Marine Exhaust Systems: Specialized piping and bellows for marine engines that face both high heat and salt-air corrosion.
- Pharmaceutical Equipment: Large-scale reaction vessels and components that require frequent high-heat sterilization.
- Power Generation: Superheater and reheater tubing in power plant boilers.
- Paper & Pulp: Bleach plant washers and equipment used in the chemical pulping process.
Available Product Forms at Aries Alloys
We stock and supply Stainless Steel 316Ti in accordance with ASTM A240 and A276:
- Sheets & Plates: Durable flat products for the fabrication of tanks and heavy-duty industrial vessels.
- Round & Hex Bars: Precision bars for machining high-temperature, corrosion-resistant fasteners.
- Seamless & Welded Tubes: High-precision tubing for chemical transport and heat exchanger systems.
- Forged Fittings: Custom flanges and connectors for high-pressure, high-heat industrial lines.