316Ti Stainless Steel Pipe
316Ti stainless steel is a titanium-containing austenitic stainless steel, based on 316L stainless steel with the addition of titanium. This steel has excellent corrosion resistance and high-temperature oxidation resistance, making it commonly used in industries requiring high corrosion resistance and high-temperature performance, such as the chemical, petroleum, medical, and food processing industries.
Key Features and Composition
Chemical Composition:
Chromium (Cr): 161719304109242658958%
Nickel (Ni): 101719304109242658954%
Molybdenum (Mo): 2-3%
Titanium (Ti): Typically approximately 0.5%
Corrosion Resistance
Due to its molybdenum content, 316Ti stainless steel exhibits excellent resistance to pitting and crevice corrosion, particularly in chloride-containing environments.
The addition of titanium prevents the precipitation of chromium carbides at high temperatures, further enhancing the steel's corrosion resistance.
High-Temperature Performance:
The addition of titanium improves the steel's stability in high-temperature environments and prevents intergranular corrosion.
This steel can withstand long-term use at high temperatures without significant degradation.
Mechanical Properties
316Ti stainless steel exhibits excellent mechanical properties, particularly at high temperatures, maintaining its strength and toughness.
Applications
316Ti stainless steel is commonly used in the following areas:
Chemical equipment: such as reactors, heat exchangers, piping, and storage tanks.
Food processing equipment, such as dairy processing equipment and beer fermentation tanks.
Medical devices, such as surgical tools and implants.
High-temperature equipment, such as boilers and heat exchangers.
Products Description
Chemical Composition
| Element | Content (%) |
|---|---|
| Carbon (C) | ≤ 0.08 |
| Silicon (Si) | ≤ 1.00 |
| Manganese (Mn) | ≤ 2.00 |
| Phosphorus (P) | ≤ 0.045 |
| Sulfur (S) | ≤ 0.030 |
| Chromium (Cr) | 16.0 – 18.0 |
| Nickel (Ni) | 10.0 – 14.0 |
| Molybdenum (Mo) | 2.00 – 3.00 |
| Titanium (Ti) | ≥ 5 × (C + N) and ≤ 0.70 |
| Nitrogen (N) | ≤ 0.10 |
| Iron (Fe) | Balance |
Chemical Composition Description
316Ti Stainless Steel Pipe is a titanium-stabilized austenitic stainless steel based on 316 grade. The addition of titanium effectively prevents chromium carbide precipitation during welding and prolonged exposure to elevated temperatures, significantly improving resistance to intergranular corrosion.
Compared with standard 316 stainless steel, TP316Ti offers enhanced high-temperature strength, superior weldability, and excellent corrosion resistance, making it ideal for heat exchangers, pressure vessels, chemical processing equipment, and petrochemical piping systems operating at temperatures up to 800°C.
Function of Major Alloying Elements
| Element | Function |
|---|---|
| Chromium (Cr) | Provides excellent corrosion and oxidation resistance. |
| Nickel (Ni) | Improves toughness, ductility, and resistance to acidic environments. |
| Molybdenum (Mo) | Enhances resistance to pitting and crevice corrosion, especially in chloride-containing media. |
| Titanium (Ti) | Stabilizes carbon, preventing chromium carbide precipitation and improving intergranular corrosion resistance after welding. |
| Carbon (C) | Maintained at a low level to improve weldability and corrosion resistance. |
Equivalent Grades
| Standard | Grade |
|---|---|
| ASTM / ASME | TP316Ti |
| UNS | S31635 |
| EN | 1.4571 |
| DIN | X6CrNiMoTi17-12-2 |
| JIS | SUS316Ti |
| ISO | X6CrNiMoTi17-12-2 |
Mechanical Properties
| Property | Value |
|---|---|
| Tensile Strength | ≥ 515 MPa (75 ksi) |
| Yield Strength (0.2% Offset) | ≥ 205 MPa (30 ksi) |
| Elongation | ≥ 35% |
| Hardness (HB) | ≤ 217 HB |
| Hardness (HRB) | ≤ 95 HRB |
| Hardness (HV) | ≤ 220 HV |
| Elastic Modulus | 193 GPa |
| Density | 7.98 g/cm³ |
| Poisson's Ratio | 0.30 |
| Melting Range | 1370–1400°C |
Mechanical Properties Description
316Ti Stainless Steel Pipe offers excellent mechanical strength while maintaining outstanding corrosion resistance and weldability. Compared with standard 316 stainless steel, the addition of titanium improves stability during long-term exposure to elevated temperatures and minimizes the risk of intergranular corrosion after welding.
The alloy retains high tensile strength and ductility under demanding service conditions, making it suitable for pressure piping, heat exchangers, boilers, chemical processing equipment, petrochemical plants, and marine applications.
Mechanical Properties at Room Temperature
| Property | Metric | Imperial |
|---|---|---|
| Tensile Strength | ≥515 MPa | ≥75 ksi |
| Yield Strength | ≥205 MPa | ≥30 ksi |
| Elongation | ≥35% | ≥35% |
| Hardness | ≤217 HB | ≤95 HRB |
Physical Properties
| Property | Value |
|---|---|
| Density | 7.98 g/cm³ |
| Elastic Modulus | 193 GPa |
| Thermal Conductivity (100°C) | 16.3 W/m·K |
| Specific Heat | 500 J/kg·K |
| Electrical Resistivity | 740 nΩ·m |
| Coefficient of Thermal Expansion (20–100°C) | 16.0 × 10⁻⁶/K |
High-Temperature Performance
316Ti Stainless Steel Pipe is specifically designed for elevated-temperature service. Titanium stabilization effectively prevents chromium carbide precipitation during prolonged exposure to temperatures between 450°C and 850°C, thereby maintaining excellent corrosion resistance and mechanical integrity.
Typical operating temperature:
| Condition | Temperature |
|---|---|
| Continuous Service | Up to 800°C |
| Intermittent Service | Up to 870°C |
This makes TP316Ti an excellent choice for high-temperature applications such as heat exchangers, furnace components, exhaust systems, petrochemical pipelines, and pressure vessels.
Advantages of Mechanical Properties
High tensile and yield strength for pressure-bearing applications.
Excellent ductility for fabrication, forming, and welding.
Superior creep resistance at elevated temperatures.
Improved resistance to intergranular corrosion due to titanium stabilization.
Stable mechanical performance after welding.
Suitable for both high-pressure and high-temperature service.
FAQ
01.What is TP316Ti Pipe?
02.Is TP316Ti Better Than 316L?
TP316Ti and 316L are both excellent stainless steel grades, but they are designed for different applications.
316L has a lower carbon content, making it ideal for general welding applications and excellent corrosion resistance. TP316Ti contains titanium, which stabilizes the material against sensitization and intergranular corrosion during long-term exposure to temperatures between 450°C and 850°C.
For high-temperature service, heat exchangers, boilers, and petrochemical equipment, TP316Ti is generally the better choice. For standard corrosive environments and lower operating temperatures, 316L is often sufficient and more economical.
03.Can 316Ti Pipe Be Welded?
Yes. TP316Ti Stainless Steel Pipe has excellent weldability and can be welded using conventional TIG, MIG, and arc welding processes. Unlike standard 316 stainless steel, the titanium addition minimizes chromium carbide precipitation during welding, reducing the risk of intergranular corrosion.
In most applications, post-weld heat treatment is not required, although proper filler materials and welding procedures should be selected according to the service environment
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