ASTM A312 TP316 Austenitic Stainless Steel Pipes (UNS S31600)
ASTM A312 TP316 (UNS S31600) is a premium austenitic stainless steel pipe grade known for its enhanced corrosion resistance due to the addition of molybdenum. TP316 offers superior performance in chloride-rich environments, acidic solutions, and marine applications. Its excellent mechanical strength, weldability, and oxidation resistance make it one of the most widely used stainless steel pipe grades across industrial sectors.
Key Features
- Molybdenum-bearing stainless steel for enhanced corrosion resistance
- Excellent resistance to pitting and crevice corrosion
- Superior performance in chloride and marine environments
- High strength and durability in aggressive service conditions
- Excellent weldability and formability
- Good high-temperature oxidation resistance
- Hygienic and easy-to-clean structure for food & pharma use
- Available in seamless, welded, and EFW constructions
Equivalent Grades
| Standard | Grade |
|---|---|
| ASTM | TP316 |
| UNS | S31600 |
| WNR | 1.4401 |
| EN | X5CrNiMo17-12-2 |
| JIS | SUS 316 |
| BS | 316S31 |
Available Sizes
- Outer Diameter (OD): 6 mm to 610 mm
- Wall Thickness: 1.2 mm to 60 mm
- Nominal Bore (NB): 1/8” NB to 24” NB
- Length Options: SRL, DRL, Cut-to-Length up to 12 meters
ASTM A312 TP316 Chemical Composition
| Element | Percentage (%) |
|---|---|
| Carbon (C) | 0.08 max |
| Manganese (Mn) | 2.00 max |
| Silicon (Si) | 1.00 max |
| Chromium (Cr) | 16.0 – 18.0 |
| Nickel (Ni) | 10.0 – 14.0 |
| Molybdenum (Mo) | 2.00 – 3.00 |
| Phosphorus (P) | 0.045 max |
| Sulfur (S) | 0.030 max |
| Nitrogen (N) | 0.10 max |
| Iron (Fe) | Balance |
ASTM A312 TP316 Mechanical Properties
| Property | Value |
|---|---|
| Tensile Strength | ≥ 515 MPa |
| Yield Strength (0.2% Proof) | ≥ 205 MPa |
| Elongation | 35% min |
| Hardness | ≤ 95 HRB |
| Modulus of Elasticity | ~193 GPa |
ASTM A312 TP316 Physical Properties
| Property | Value |
|---|---|
| Density | 8.00 g/cm³ |
| Melting Range | 1375 – 1400°C |
| Thermal Conductivity | 16.3 W/m·K (at 100°C) |
| Electrical Resistivity | 0.75 µΩ·m |
| Coefficient of Expansion | 16.0 µm/m°C (20–100°C) |
Types of TP316 Stainless Steel Pipes
- Seamless Stainless Steel Pipes
- Welded Stainless Steel Pipes
- EFW (Electric Fusion Welded) Pipes
- Round Pipes
- Square Pipes
- Rectangular Pipes
- Instrumentation & Hydraulic Pipes
- Heat Exchanger Tubes
- Custom Fabricated Stainless Steel Pipes
Applications
- Chemical & petrochemical processing
- Oil & gas pipelines
- Marine and offshore systems
- Food & dairy industry equipment
- Pharmaceutical processing lines
- Heat exchangers and condensers
- Pulp & paper industry
- Desalination plants
- Architectural & structural tubing
- Water treatment plants
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