ASTM A312 TP317 Austenitic Stainless Steel Pipes (UNS S31700)
ASTM A312 TP317 (UNS S31700) is a high-alloy austenitic stainless steel pipe grade containing increased molybdenum and nickel for superior corrosion resistance. It offers improved resistance to pitting, crevice corrosion, and chemical attack compared to standard 316. TP317 pipes are widely used in aggressive environments involving acids, chlorides, and industrial chemicals where higher durability and performance are required.
Key Features
- High molybdenum content for enhanced corrosion resistance
- Superior pitting and crevice corrosion resistance vs TP316
- Excellent performance in chloride and chemical environments
- High mechanical strength and durability
- Good weldability and formability
- Resistant to stress-corrosion cracking
- Excellent oxidation resistance at elevated temperatures
- Available in seamless, welded, and EFW pipe types
Equivalent Grades
| Standard | Grade |
|---|---|
| ASTM | TP317 |
| UNS | S31700 |
| WNR | 1.4449 |
| EN | X10CrNiMoTi18-12 |
| JIS | SUS 317 |
| BS | 317S12 |
Available Sizes
- Outer Diameter (OD): 6 mm to 610 mm
- Wall Thickness: 1.2 mm to 60 mm
- Nominal Bore: 1/8” NB to 24” NB
- Lengths: Single Random, Double Random, Custom (up to 12 meters)
ASTM A312 TP317 Chemical Composition
| Element | Percentage (%) |
|---|---|
| Carbon (C) | 0.08 max |
| Manganese (Mn) | 2.00 max |
| Silicon (Si) | 1.00 max |
| Chromium (Cr) | 18.0 – 20.0 |
| Nickel (Ni) | 11.0 – 15.0 |
| Molybdenum (Mo) | 3.0 – 4.0 |
| Phosphorus (P) | 0.045 max |
| Sulfur (S) | 0.030 max |
| Nitrogen (N) | 0.10 max |
| Iron (Fe) | Balance |
ASTM A312 TP317 Mechanical Properties
| Property | Value |
|---|---|
| Tensile Strength | ≥ 515 MPa |
| Yield Strength (0.2% Proof) | ≥ 205 MPa |
| Elongation | 40% min |
| Hardness | ≤ 95 HRB |
| Modulus of Elasticity | ~193 GPa |
ASTM A312 TP317 Physical Properties
| Property | Value |
|---|---|
| Density | 8.00 g/cm³ |
| Melting Range | 1370 – 1400°C |
| Thermal Conductivity | 16.3 W/m·K (at 100°C) |
| Electrical Resistivity | 0.74 µΩ·m |
| Coefficient of Expansion | 16.0 µm/m°C (20–100°C) |
Types of TP317 Stainless Steel Pipes
- Seamless Pipes
- Welded Pipes
- EFW Pipes
- Round Pipes
- Square Pipes
- Rectangular Pipes
- Heat Exchanger Tubes
- Chemical Processing Pipes
- Custom Fabricated Pipes
Applications
- Chemical processing & petrochemical industries
- Pulp & paper processing machines
- Marine and offshore equipment
- Fertilizer & pharmaceutical industries
- Acidic and chloride-rich environments
- Heat exchangers & desalination plants
- Power generation & refinery systems
- Food and beverage processing
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