ASTM A269 TP317 Stainless Steel Tubes (UNS S31700)
ASTM A269 TP317 is a high-alloy austenitic stainless steel tube grade containing higher levels of chromium, nickel, and molybdenum compared to 316. This enhanced chemical composition provides superior resistance to pitting, crevice corrosion, and chemical attack—making TP317 ideal for highly corrosive environments, especially those containing chlorides, sulfuric acid, and aggressive chemicals.
With excellent mechanical strength, good weldability, and outstanding corrosion resistance, TP317 (UNS S31700) stainless steel tubes are widely used in chemical processing equipment, pulp & paper plants, marine systems, and high-pressure industrial applications.
Key Features
- Superior Corrosion Resistance compared to 316/316L due to higher Mo content.
- Excellent Resistance to Pitting & Crevice Corrosion in chloride-rich environments.
- High Strength & Durability for demanding applications.
- Good Weldability & Fabrication Characteristics.
- Stable Structural Integrity in high-temperature and high-pressure services.
- Smooth and Clean Inner Surface for sanitary and high-purity flow.
- Compliant with ASTM A269 Standard ensuring dimensional accuracy and quality.
Equivalent Grades
| Standard | Grade |
|---|---|
| ASTM / ASME | 317 / UNS S31700 |
| EN / DIN | 1.4449 / X5CrNiMo17-13-3 |
| JIS | SUS317 |
| BS | 317S12 |
Available Sizes
- Outside Diameter (OD): 6 mm – 101.6 mm
- Wall Thickness: 0.5 mm – 8 mm
- Length: Up to 6 meters (custom lengths available)
- Custom OD/WT combinations available for project requirements.
ASTM A269 TP317 Chemical Composition (UNS S31700)
| Element | Percentage (%) |
|---|---|
| Carbon (C) | ≤ 0.08 |
| Chromium (Cr) | 18.0 – 20.0 |
| Nickel (Ni) | 11.0 – 15.0 |
| Molybdenum (Mo) | 3.0 – 4.0 |
| Manganese (Mn) | ≤ 2.0 |
| Silicon (Si) | ≤ 1.0 |
| Phosphorus (P) | ≤ 0.045 |
| Sulfur (S) | ≤ 0.030 |
| Nitrogen (N) | ≤ 0.10 |
| Iron (Fe) | Balance |
ASTM A269 TP317 Mechanical Properties
| Property | Value |
|---|---|
| Tensile Strength | ≥ 515 MPa |
| Yield Strength (0.2% Proof) | ≥ 205 MPa |
| Elongation | ≥ 35% |
| Hardness (Rockwell B) | ≤ 95 HRB |
ASTM A269 TP317 Physical Properties
| Property | Value |
|---|---|
| Density | 8.03 g/cm³ |
| Melting Range | 1370 – 1400°C |
| Thermal Conductivity | 16 W/m·K at 100°C |
| Electrical Resistivity | 0.75 µΩ·m |
| Modulus of Elasticity | 193 GPa |
| Specific Heat | 500 J/kg·K |
Types of ASTM A269 TP317 Tubes
- Seamless Tubes
- Welded Tubes
- Cold Drawn Tubes
- Heat Exchanger Tubes
- Instrumentation Tubes
- Sanitary/Hygienic Tubes
- U-Tubes
- Polished Decorative Tubes
Applications
- Chemical & Petrochemical Processing
- Pulp & Paper Industry (bleach & acidic environments)
- Marine & Offshore Equipment
- Food & Pharmaceutical Equipment
- High-Purity Fluid Processing
- Heat Exchangers & Condensers
- Oil & Gas Processing
- Desalination Plants
- Pollution Control Systems
- Acidic and High-Chloride Environments
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