ASTM A213 TP317 Stainless Steel Tubes (UNS S31700)
ASTM A213 TP317 (UNS S31700) Stainless Steel Tubes are high-alloy austenitic stainless steel tubes enriched with higher chromium, nickel, and molybdenum content compared to SS 316. This enhanced chemistry provides superior resistance to pitting, crevice corrosion, and aggressive acidic environments, especially those containing sulfuric and chlorides. TP317 is widely used in heat exchangers, boilers, superheaters, and chemical processing equipment where exceptional corrosion resistance and strength are essential.
Due to its molybdenum-rich composition, TP317 offers improved resistance to chemical attack from halides, strong acids, and industrial solvents. The grade is well-known for its excellent high-temperature performance, structural stability, and long operational life in harsh industrial settings. ASTM A213 TP317 seamless tubes also offer superior mechanical strength, excellent weldability, and great formability, making them suitable for demanding fabrication and engineering applications across multiple industries.
Key Features
- Higher chromium & molybdenum content than 316 for better corrosion resistance
- Excellent resistance to pitting, crevice corrosion & acidic media
- Suitable for high-temperature & high-pressure service
- Outstanding resistance to chemical, chloride & sulfate attacks
- Excellent weldability & formability
- High mechanical strength and durability
- Long-lasting performance in harsh environments
Equivalent Grades
| Standard | Grade |
|---|---|
| UNS | S31700 |
| WNR | 1.4449 |
| EN | X2CrNiMo18-15-4 |
| JIS | SUS 317 |
| BS | 317S12 |
Available Sizes
- Outer Diameter: 6 mm to 101.6 mm
- Wall Thickness: 0.5 mm to 12.7 mm
- Length: Up to 12 meters
ASTM A213 TP317 Chemical Composition
| Element | % |
|---|---|
| C | 0.08 max |
| Mn | 2.00 max |
| Si | 1.00 max |
| P | 0.045 max |
| S | 0.030 max |
| Cr | 18.0–20.0 |
| Ni | 11.0–15.0 |
| Mo | 3.00–4.00 |
| N | 0.10 max |
| Fe | Balance |
ASTM A213 TP317 Mechanical Properties
| Property | Value |
|---|---|
| Tensile Strength | 515 MPa min |
| Yield Strength | 205 MPa min |
| Elongation | 35% min |
| Hardness | 90 HRB max |
Physical Properties
| Property | Value |
|---|---|
| Density | 8.0 g/cm³ |
| Melting Range | 1370–1400°C |
| Thermal Conductivity | 16 W/m·K |
| Modulus of Elasticity | 193 GPa |
Types ASTM A213 TP317 Tubes
- TP317 Seamless Heat Exchanger Tubes
- TP317 Boiler Tubes
- TP317 Superheater Tubes
- TP317 High-Pressure Tubes
- TP317 Condenser Tubes
- TP317 Instrumentation Tubes
Application
- Chemical Processing & Acid Production
- Petrochemical & Refinery Equipment
- Fertilizer Plants
- Heat Exchangers & Superheaters
- Marine & Offshore Installations
- Food & Beverage Plants
- Pharmaceutical Equipment
- Oil & Gas Processing Units
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