ASTM A312 Stainless Seamless Pipes
Features
- Seamless construction with no weld seam, so corrosion resistance and strength are consistent along the whole pipe
- Chromium rich surface that resists rust and oxidation in harsh environments
- 316 and 316L grades with added molybdenum for better resistance to chlorides and aggressive chemicals
- Low carbon L grades that stay corrosion resistant after welding
- Solution annealed for good ductility and toughness across a wide temperature range
- Every pipe tested for pressure integrity before dispatch
- Custom lengths, end finishes, and surface treatments available
Specifications
| Parameter | Specification |
|---|---|
| Standard | ASTM A312 / ASME SA312 |
| Grades | TP304, TP304L, TP316, TP316L, TP321 |
| Manufacturing Process | Seamless, hot finished or cold drawn |
| Heat Treatment | Solution annealed |
| Size Range | NPS 1/2″ to 24″ (21.3 to 609.6 mm OD) |
| Wall Thickness | Sch 5S to Sch XXS, or to customer specification |
| Length | 6 m, 12 m, or cut to length |
| Pipe Ends | Plain or beveled |
| Surface Finish | Pickled and annealed, bright annealed, or polished |
| Testing | Hydrostatic or eddy current, flattening, flaring, intergranular corrosion test on request |
| Typical Use | Process piping, heat exchangers, and corrosive fluid transport |
Chemical Composition and Mechanical Properties
| Element (%) | TP304 | TP304L | TP316 | TP316L |
|---|---|---|---|---|
| Carbon | 0.08 max | 0.035 max | 0.08 max | 0.035 max |
| Manganese | 2.00 max | 2.00 max | 2.00 max | 2.00 max |
| Phosphorus | 0.045 max | 0.045 max | 0.045 max | 0.045 max |
| Sulfur | 0.030 max | 0.030 max | 0.030 max | 0.030 max |
| Silicon | 1.00 max | 1.00 max | 1.00 max | 1.00 max |
| Chromium | 18.0 to 20.0 | 18.0 to 20.0 | 16.0 to 18.0 | 16.0 to 18.0 |
| Nickel | 8.0 to 11.0 | 8.0 to 13.0 | 11.0 to 14.0 | 10.0 to 15.0 |
| Molybdenum | None | None | 2.00 to 3.00 | 2.00 to 3.00 |
| Property | TP304 / TP316 | TP304L / TP316L |
|---|---|---|
| Tensile Strength | 515 MPa (75 ksi) min | 485 MPa (70 ksi) min |
| Yield Strength | 205 MPa (30 ksi) min | 170 MPa (25 ksi) min |
| Elongation | 35% min | 35% min |
Size Chart
| NPS | Outside Diameter (mm) | Available Schedules |
|---|---|---|
| 1/2″ | 21.3 | Sch 5S, 10S, 40S, 80S, 160 |
| 1″ | 33.4 | Sch 5S, 10S, 40S, 80S, 160 |
| 2″ | 60.3 | Sch 5S, 10S, 40S, 80S, 160 |
| 4″ | 114.3 | Sch 5S, 10S, 40S, 80S, 160 |
| 6″ | 168.3 | Sch 5S, 10S, 40S, 80S, 160 |
| 8″ | 219.1 | Sch 5S, 10S, 40S, 80S, 160 |
| 12″ | 323.9 | Sch 5S, 10S, 40S, 80S |
| 24″ | 609.6 | Sch 10S, 40S, 80S |
Use Case
- Chemical and petrochemical process piping
- Oil and gas, offshore, and marine piping
- Power plant and heat exchanger systems
- Food, beverage, and pharmaceutical processing lines
- Water treatment and desalination plants
- High and low temperature fluid transport