UNS S31635|1.4571|TP316Ti Seamless Stainless Steel Tube
Distinguished by the strategic addition of Titanium (Ti), our TP316Ti tubing prevents chromium carbide precipitation during prolonged exposure to the 425°C - 815°C range. This stabilization ensures superior resistance to intergranular corrosion (IGC) and pitting in chloride-rich environments, making them indispensable for mission-critical applications in heat exchangers, offshore marine hardware, and exhaust systems. Through advanced cold-drawing and precise solution annealing, XinZhe ensures every tube maintains a uniform microstructure and optimized creep strength for the most demanding industrial conditions.
“Our precision-controlled Titanium-to-Carbon ratio ensures that carbides are fully stabilized, preventing sensitization even after welding and high-temperature service.”
What Is a Seamless Stainless Steel TP316Ti Tube?
TP316Ti (UNS S31635) is a titanium-stabilised austenitic stainless steel tube based on the 316L composition. The titanium addition (5 × C to 0.70%) ties up carbon as stable titanium carbides, preventing chromium carbide precipitation at grain boundaries. This stabilisation makes TP316Ti especially suited to welded construction and service in the sensitising range of 425–815 °C.
Premium Seamless Stainless Steel TP316Ti Tubing (1.4571 / UNS S31635)
What is Seamless Stainless Steel TP316Ti Tubing?
Seamless Stainless Steel TP316Ti Tubing (EN 1.4571 / UNS S31635) is a titanium-stabilized austenitic stainless steel tube engineered for high-temperature and highly corrosive environments. It is manufactured from solid billets using hot piercing and precision cold drawing processes, ensuring a fully homogeneous structure without weld seams.
This seamless construction provides:
Why Choose TP316Ti Over 316L?
While 316L stainless steel is widely used for general corrosion resistance, it is prone to sensitization (chromium carbide precipitation) when exposed to temperatures between 425°C – 815°C (800°F – 1500°F).
TP316Ti solves this issue through titanium (Ti) stabilization:
This makes TP316Ti tubing the preferred material for high-temperature process systems and critical corrosion applications.
Key Advantages of TP316Ti Seamless Tubes
1. Outstanding Intergranular Corrosion Resistance
Titanium stabilization eliminates carbide precipitation, ensuring durability after welding and prolonged high-temperature exposure.
2. Superior Resistance to Pitting & Crevice Corrosion
With 2.0% – 2.5% molybdenum (Mo) content, TP316Ti performs exceptionally well in:
3. Enhanced High-Temperature Mechanical Properties
4. Seamless High-Pressure Reliability
The absence of weld seams ensures:
Key Features and Technical Advantages
Titanium Stabilisation
Titanium at 5 × C to 0.70% ties up carbon as stable TiC, preventing chromium carbide precipitation and preserving corrosion resistance after welding.
Excellent Intergranular Corrosion Resistance
Because chromium stays in solution, TP316Ti resists intergranular attack in the sensitising range of 425–815 °C where unstabilised 316 would be vulnerable.
Molybdenum-Bearing Corrosion Resistance
2–3% molybdenum provides the pitting and crevice-corrosion resistance expected of the 316 family, including good performance in chloride-containing media.
Good Elevated-Temperature Strength
Stabilisation allows TP316Ti to retain useful strength in continuous service up to about 800 °C.
Superior Weldability
The stabilised chemistry makes TP316Ti particularly suitable for welded assemblies that cannot be solution-annealed after fabrication.
Product Specifications and Data
To provide a comprehensive overview of this high-performance material, here are the detailed technical specifications and performance data for 316Ti stainless steel.
The key to 316Ti’s performance is its precise composition, including the crucial addition of titanium.
| C | Si | Mn | P | S | Cr | Ni | Mo | Ti | Fe |
| ≤ 0.08 | ≤ 0.75 | ≤ 2.00 | ≤ 0.045 | ≤ 0.03 | 16.00 - 18.00 | 10.00 - 14.00 | 2.00 - 3.00 | 5x(C+N) - 0.70 | Bal |
Grade 316Ti offers a balance of strength and ductility, making it a reliable solution for various industrial applications.
| Tensile Strength | Yield Strength | Elongation | Rockwell Hardness | Brinell Hardness |
|---|---|---|---|---|
| ≥ 515 MPa | ≥ 205 MPa | ≥ 35% | ≤ 90 HRB | ≤ 192 HB |
These physical properties highlight the material's ability to perform reliably across a range of environments.
| Density | Melting Point | Thermal Expansion | Thermal Conductivity | Modulus of Elasticity | Electrical Resistivity |
|---|---|---|---|---|---|
| 8.0 g/cm³ | 1370-1400 °C | 16.5 µm/m·°C (20-100°C) | 15.2 W/m·K (100°C) | 193 GPa | 7.4 x 10⁻⁷ Ω·m (20°C) |
| Standard | OD(D) | Tolerance（MM) | Thickness(S) | Tolerance(MM) | Length | Tolerance | |
| MM | Common | High | MM | MM | |||
| EN 10216-5 HFD | 30≤D≤219.1（D2) | ±1.0% or ±0.5mm, whicever is the greater(取较大者) | T1, T≤4 | ±15% or ±0.6mm, whicever is the greater(取较大者) | L≤6M | +5/0 | |
| T2 | ±12.5% or ±0.4mm, whicever is the greater(取较大者) | ||||||
| 219.1≤D≤610 (D1) | ±1.5% or ±0.75mm, whicever is the greater (取较大者) | T≤0.05D | +22.5%/-15% | 6 | +10/0 | ||
| T1, 0.05D | ±15% or ±0.6mm, whicever is the greater(取较大者) | ||||||
| T2, T>0.09D | ±12.5% or ±0.4mm, whicever is the greater(取较大者) | L>12 | +by agreement/0 | ||||
| EN 10216-5 CFD | D3(D≤219.1) | ±0.75% or ±0.3mm, whicever is the greater(取较大者) | T3 | ±10% or ±0.2mm, whicever is the greater(取较大者) | |||
| D4(D≤219.1) | ±0.5% or ±0.mm, whicever is the greater(取较大者) | T4 | ±7.5% or ±0.15mm, whicever is the greater(取较大者) | ||||
| ASTM A213 HFD | D≤100 | +0.4/-0.8 | D<100,S≤2.4 | +40%/0 | HFD, all size | +5.0/0 | |
| +0.4/-1.2 | D<100,2.4 | +35%/0 | |||||
| +0.4/-1.6 | D<100,3.8 | +33%/0 | |||||
| D<100,S>4.6 | +28%/0 | ||||||
| 100 | +0.4/-1.2 | D>100, 2.4 | +35%/0 | ||||
| 200 | +0.4/-1.6 | D>100,3.8 | +33%/0 | ||||
| D>100,S>4.6 | +28%/0 | ||||||
| ASTM A213 CFD | D<25 | ±0.10 | D≤38.1 | +20%/0 | CFD, D<50.8 | +3.0/0 | |
| 25≤D≤40 | ±0.15 | ||||||
| 40 | ±0.20 | ||||||
| 50≤D<65 | ±0.25 | ||||||
| 65≤D<75 | ±0.30 | D>38.1 | +22%/0 | CFD, D≥50.8 | +5.0/0 | ||
| 75≤D≤100 | ±0.38 | ||||||
| 100 | +0.38/-0.64 | ||||||
| 200 | +0.38/-1.14 | ||||||
| ASTM A269 | D≤13 | ±0.13 | D≤13 | ±15% | D<38 | +3.2/0 | |
| 13 | ±0.13 | 13 | ±10% | ||||
| 38≤D<89 | ±0.25 | D>38 | +4.8/0 | ||||
| 89≤D<140 | ±0.38 | ||||||
| 140≤D<203 | ±0.76 | ||||||
| 203≤D<305 | ±1.01 | ||||||
| 305≤D<356 | ±1.26 | ||||||
| ASTM A270 | D<25 | ±0.13 | For weld pipe all size | ±12.5% | +3.0/0 | ||
| 25-50 | ±0.20 | ||||||
| 50-75 | ±0.25 | ||||||
| 75-100 | ±0.38 | For CD SMLS pipe D≤38.1 | +20%/0 | ||||
| 100-140 | ±0.38 | +5.0/0 | |||||
| 140-200 | ±0.75 | For CD SMLS pipe D>38.1 | +22%/0 | ||||
| 200-300 | ±1.25 | ||||||
Dimensional Standards and Tolerances
TP316Ti seamless tubes are supplied to the dimensional tolerances of ASTM A213 / A1016 or EN 10216-5 as specified.
Industrial Applications of TP316Ti Tubing
TP316Ti seamless tubing is widely used in industries requiring thermal stability and corrosion resistance:
Chemical & Petrochemical Processing
- Acid handling systems (sulfuric, phosphoric, organic acids)
- High-temperature pipelines
Heat Exchangers & Condensers
- Thermal cycling zones
- Corrosive heat transfer environments
Marine & Offshore Engineering
- Excellent resistance to chloride-induced stress corrosion cracking (SCC)
- Ideal for seawater and subsea systems
Automotive Exhaust Systems
- Withstands high-temperature exhaust gases
- Resistant to oxidation and thermal fatigue
Advanced Manufacturing Process & Quality Assurance
1. Hot Piercing & Billet Preparation
Uniform heating of 316Ti billets followed by precision piercing to produce a hollow mother tube.
2. Cold Pilgering / Cold Drawing
Multi-stage dimensional reduction ensures:
- Tight OD and wall thickness tolerances
- Superior surface finish (Ra ≤ 0.8 μm)
3. Solution Annealing Treatment
- Heating range: 1040°C – 1150°C
- Rapid water quenching
- Restores corrosion resistance and optimizes microstructure
4. Comprehensive Testing & Inspection
Non-Destructive Testing (NDT):
- Eddy Current Testing (ECT)
- Ultrasonic Testing (UT)
Destructive Testing:
- Flaring Test
- Flattening Test
- Intergranular Corrosion Test (ASTM A262 Practice E)
Common Industrial Applications
Chemical and Petrochemical Processing
- Reactor internals and piping
- Heat exchanger tubing
- Process lines handling chlorides
Pulp and Paper Industry
- Digester and liquor lines
- Bleaching plant piping
- Heat-transfer equipment
Food and Pharmaceutical Processing
- Sanitary process piping
- CIP and utility lines
- Heat exchanger tubing
Power Generation and Pollution Control
- Flue-gas desulphurisation piping
- Heat exchanger tubing
- Condenser and feedwater heater tubes
Quality Assurance and Manufacturing Process
Certification
All TP316Ti tubes are supplied to ASTM A213 / ASME SA213 and EN 10216-5 with EN 10204 3.1 mill test certificates. Third-party inspection (SGS, BV, TUV, Lloyd's), PMI reports and full heat-number traceability can be provided on request.
Non-Destructive Testing (NDT)
Hydrostatic or eddy-current testing is performed on 100% of tubes. Ultrasonic testing (UT) and dye-penetrant inspection (PT) are available for critical service, with records retained for each production lot.
Material Verification
Positive Material Identification (PMI) and spectrometric analysis confirm that the chemical composition matches the ordered grade. Intergranular corrosion (IGC) testing to ASTM A262 Practice E is available for austenitic and nickel-alloy tubes.
Mechanical Testing
Tensile, yield, elongation and hardness tests are carried out per heat. Flattening, flaring and reverse-bend tests verify ductility, while creep-rupture data can be supplied for high-temperature grades.
Dimensional Inspection
Outside diameter, wall thickness, ovality and straightness are measured against ASTM A1016 / A1016M or EN 10216-5 tolerances. Length, square-cut ends and end-finish conditions are verified before packing.
TP316Ti vs TP316L / TP321 – Technical Comparison
TP316Ti, TP316L and TP321 are closely related austenitic grades that differ in how they resist sensitisation after welding.
Stabilisation Mechanism
- TP316Ti: stabilised with titanium (5 × C to 0.70%)
- TP321: stabilised with titanium (5 × C to 0.70%) on an 18-8 base
- TP316L: not stabilised; low carbon (0.030% max) instead
Intergranular Corrosion Resistance
Both TP316Ti and TP321 use titanium to tie up carbon as stable carbides, so chromium stays in solution and the heat-affected zone keeps its corrosion resistance. TP316L achieves a similar outcome by keeping total carbon low enough that little carbide can form.
Elevated-Temperature Behaviour
The molybdenum in TP316Ti gives it better pitting and crevice-corrosion resistance than TP321 in chloride-bearing service, while stabilisation lets it serve continuously up to about 800 °C.
Selection Guide
- Choose TP316Ti where welded 316-family equipment must resist intergranular corrosion and chlorides simultaneously
- Choose TP316L for general corrosion service where welding is followed by adequate cleaning
- Choose TP321 where stabilisation is needed but molybdenum is not
Frequently Asked Questions
What is TP316Ti seamless tube?
TP316Ti (UNS S31635) is a titanium-stabilised austenitic stainless steel tube based on the 316 chemistry, produced without a longitudinal weld. Titanium at 5 × C to 0.70% ties up carbon as stable carbides, preventing chromium carbide precipitation.
Why is TP316Ti stabilised with titanium?
Stabilisation prevents chromium depletion at grain boundaries during welding or high-temperature service in the sensitising range of 425–815 °C. That preserves intergranular corrosion resistance in the heat-affected zone.
What standard covers TP316Ti seamless tube?
TP316Ti is supplied to ASTM A213 / ASME SA213 and EN 10216-5, with other national or project specifications quoted on request.
What is TP316Ti tube used for?
TP316Ti is used for welded chemical and petrochemical equipment, heat exchanger tubing, pulp and paper process lines, and any 316-family application where the assembly cannot be solution-annealed after welding.
Ready to Request a Quotation?
Send your Seamless Stainless Steel TP316Ti Tube enquiry with grade, application, size (OD and wall thickness or schedule), quantity, length, end finish and inspection requirements. Our technical team will confirm availability, testing scope and lead time.
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