TP316Ti (UNS S31635, EN 1.4571) is a titanium-stabilized austenitic stainless steel renowned for its enhanced corrosion resistance and high-temperature performance. As a variant of the 316 stainless steel family, TP316Ti incorporates titanium (Ti: 5×(C%+N)-0.7), which stabilizes the alloy against carbide precipitation during welding and high-temperature service. This makes it particularly suitable for applications where weldability and long-term corrosion resistance are critical.
Manufactured to standards including ASTM A213, ASTM A312, and GOST, TP316Ti seamless pipes and tubes undergo precision processing to ensure uniform wall thickness, mechanical consistency, and dimensional accuracy. The alloy’s unique composition—combining chromium (16.00–18.00%), nickel (10.00–14.00%), molybdenum (2.00–3.00%), and titanium—delivers a balance of strength, ductility, and resistance to a wide range of corrosive media.
Zhejiang Xintongda Special Steel Manufacturing Co., Ltd. provides TP316Ti products that meet the highest quality benchmarks, offering reliable solutions for industries ranging from chemical processing to marine engineering.
| Grade | UNS | C Content | Ti Content | Mo Content | Key Feature |
| 316 | S31600 | ≤0.08 | - | 2.00–3.00 | Standard corrosion resistance |
| 316L | S31603 | ≤0.035 | - | 2.00–3.00 | Low-carbon for improved weldability |
| 316H | S31609 | 0.04–0.10 | - | 2.00–3.00 | High-temperature strength |
| 316Ti | S31635 | ≤0.08 | 5×(C%+N)–0.7 | 2.00–3.00 | Titanium-stabilized for carbide resistance |
| 316N | S31651 | ≤0.08 | - | 2.00–3.00 | Nitrogen-strengthened for higher strength |
| 316LN | S31653 | ≤0.035 | - | 2.00–2.50 | Low-carbon + nitrogen for corrosion resistance |
| Grade | Tensile Strength | Yield Strength | Elongation | Hardness (HRB) | Application Focus |
| 316 | ≥75 ksi (515 MPa) | ≥30 ksi (205 MPa) | ≥35% | ≤95 | General corrosion resistance |
| 316L | ≥70 ksi (485 MPa) | ≥25 ksi (170 MPa) | ≥35% | ≤95 | Welded structures |
| 316H | ≥75 ksi (515 MPa) | ≥30 ksi (205 MPa) | ≥35% | ≤95 | High-temperature pressure parts |
| 316Ti | ≥75 ksi (515 MPa) | ≥30 ksi (205 MPa) | ≥35% | ≤95 | Welded components in corrosive environments |
| 316N | ≥80 ksi (550 MPa) | ≥35 ksi (240 MPa) | ≥35% | ≤100 | High-strength applications |
| 316LN | ≥75 ksi (515 MPa) | ≥30 ksi (205 MPa) | ≥35% | ≤95 | Chloride-resistant structures |
| Grade | UNS | C | Mn | P | S | Si | Cr | Ni | Mo | N | Ti |
| 316Ti | S31635 | ≤0.08 | ≤2.00 | ≤0.045 | ≤0.03 | ≤0.75 | 16.00–18.00 | 10.00–14.00 | 2.00–3.00 | ≤0.10 | 5×(C%+N)–0.7 |
| Grade | UNS | Tensile Strength (ksi/MPa) | Yield Strength (ksi/MPa) | Elongation (%) | Hardness (HRB) |
| 316Ti | S31635 | ≥75/515 | ≥30/205 | ≥35 | ≤95 |
| Property | Value |
| Density | 7.98 g/cm³ |
| Melting Point | 1375–1450°C |
| Thermal Conductivity | 16.3 W/m·K (100°C) |
| Electrical Resistivity | 74.0 μΩ·cm |
| Thermal Expansion | 16.0 μm/m·°C (20–100°C) |
| Elastic Modulus | 193 GPa |
TP316Ti’s titanium stabilization significantly reduces the risk of intergranular corrosion, particularly in welded components. Key corrosion-resistant attributes include:
Chloride Environments: Resists pitting and crevice corrosion in chloride-rich media, though not recommended for hot seawater applications.
Chemical Media: Performs well in acids, alkalis, and salt solutions, outperforming 304 stainless steel in corrosive conditions.
Welded Structures: Titanium addition minimizes carbide precipitation in heat-affected zones (HAZs), maintaining corrosion resistance post-welding—unlike 316, which may require post-weld annealing.
Withstands continuous service up to 870°C, demonstrating good oxidation resistance—comparable to 316H but with better weldability.
Retains mechanical strength at elevated temperatures, making it suitable for furnace components where 316L may lose stability.
Readily weldable by TIG, MIG, and stick welding methods without specialized preheating—outperforming 316H, which requires careful heat control.
Reduced need for post-weld heat treatment due to titanium stabilization, lowering fabrication costs compared to non-stabilized alloys like 316.
Balances high tensile strength (≥515 MPa) with excellent ductility (≥35% elongation), enabling complex forming—similar to 316 but with improved thermal stability.
Maintains toughness across a wide temperature range, from ambient to high-service conditions, unlike 316L, which has lower tensile strength.
Corrosive Fluid Handling: Piping for acids, alkalis, and salt solutions in chemical plants—preferred over 316 for welded systems.
Reactors & Heat Exchangers: Components exposed to aggressive media, where titanium stabilization prevents weld decay (unlike 316).
Hygienic Systems: Tubing for drug manufacturing and food processing, meeting strict cleanliness standards—similar to 316L but with better high-temperature resistance.
Sterilization Equipment: Pipes and vessels resistant to corrosion from cleaning agents, outperforming 304 in durability.
Refinery Equipment: Process lines, valves, and heat exchangers in oil refining—chosen over 316 for its resistance to sulfur compounds.
Offshore Applications: Corrosion-resistant components for marine-based operations, where 316Ti’s chloride resistance exceeds 304.
Chemical Pulping: Pipes for conveying pulping chemicals—more durable than 316 in acidic conditions.
Bleaching Processes: Equipment exposed to chlorine-based agents, outperforming 316L in long-term use.
316Ti’s titanium stabilization provides superior resistance to intergranular corrosion in welded joints, making it ideal for fabricated structures. 316L relies on low carbon to reduce carbide precipitation, but 316Ti offers more reliable performance in high-temperature or heavily welded applications.
Select 316Ti for applications requiring excellent corrosion resistance in welded components, such as chemical reactors. Choose 316N when high tensile strength (≥80 ksi) is prioritized, e.g., in high-pressure pipes, but note that 316N has lower corrosion resistance than 316Ti in some media.
316H is preferred for continuous service above 500°C due to its higher carbon content, which enhances creep strength. 316Ti is suitable up to 870°C for oxidation resistance but may have lower strength than 316H at very high temperatures.
Yes, 316Ti’s titanium addition increases production costs. However, its superior weldability and corrosion resistance in critical applications often justify the expense compared to rework costs with 316.
Duplex alloys (e.g., 2205) offer better resistance to hot seawater and chloride stress corrosion. 316Ti is suitable for ambient-temperature marine applications but may fail in hot seawater, where duplex steels are preferred.
