Schedule 40 Stainless Steel Pipe is a standard wall thickness pipe widely used in industrial, commercial, and residential applications. It offers a balanced combination of strength, corrosion resistance, and cost-effectiveness. Manufactured from high-quality austenitic stainless steel grades such as 304 and 316, this pipe is suitable for fluid transport, structural support, and process piping systems. Schedule 40 wall thickness provides higher pressure ratings than Schedule 10 while remaining lighter and more affordable than Schedule 80. Available in seamless or welded construction.
Product Specifications
| Parameter | Details |
|---|
| Standards | ASTM A312, A269; ASME SA312; EN 10217-7 |
| Available Grades | 304, 304L, 316, 316L |
| Nominal Pipe Size (NPS) | 1/8″ – 24″ (6 mm – 610 mm) |
| Wall Thickness | Schedule 40 (per ASME B36.19) |
| Length | 6m standard; custom lengths available |
| Manufacturing Process | Seamless (cold drawn / hot rolled) or Welded (TIG / ERW) |
| Heat Treatment | Annealed after manufacturing |
| Surface Finish | Pickled, passivated, or mill finish |
| End Finish | Plain ends, beveled ends, or threaded |
Schedule 40 Wall Thickness (ASME B36.19)
| NPS (inch) | OD (mm) | Wall Thickness (mm) | Weight (kg/m) |
|---|
| 1/8″ | 10.3 | 1.73 | 0.37 |
| 1/4″ | 13.7 | 2.24 | 0.63 |
| 1/2″ | 21.3 | 2.77 | 1.27 |
| 3/4″ | 26.7 | 2.87 | 1.69 |
| 1″ | 33.4 | 3.38 | 2.51 |
| 1-1/2″ | 48.3 | 3.68 | 4.05 |
| 2″ | 60.3 | 3.91 | 5.44 |
| 3″ | 88.9 | 5.49 | 11.29 |
| 4″ | 114.3 | 6.02 | 16.07 |
| 6″ | 168.3 | 7.11 | 28.26 |
| 8″ | 219.1 | 8.18 | 42.55 |
| 10″ | 273.1 | 9.27 | 60.31 |
| 12″ | 323.9 | 9.53 | 73.93 |
Chemical Composition (Typical Values, %)
| Grade | C ≤ | Si ≤ | Mn ≤ | P ≤ | S ≤ | Cr | Ni | Mo |
|---|
| 304 | 0.08 | 0.75 | 2.00 | 0.045 | 0.030 | 18.0-20.0 | 8.0-10.5 | – |
| 304L | 0.03 | 0.75 | 2.00 | 0.045 | 0.030 | 18.0-20.0 | 8.0-12.0 | – |
| 316 | 0.08 | 0.75 | 2.00 | 0.045 | 0.030 | 16.0-18.0 | 10.0-14.0 | 2.0-3.0 |
| 316L | 0.03 | 0.75 | 2.00 | 0.045 | 0.030 | 16.0-18.0 | 10.0-14.0 | 2.0-3.0 |
Mechanical Properties (at Room Temperature)
| Grade | Tensile Strength (MPa) min | Yield Strength (MPa) min | Elongation (%) min | Hardness (HB) max |
|---|
| 304 | 515 | 205 | 35 | 201 |
| 304L | 485 | 170 | 35 | 201 |
| 316 | 515 | 205 | 35 | 217 |
| 316L | 485 | 170 | 35 | 217 |
Tested in accordance with ASTM E8 / E8M.
Pressure Rating (304 / 316 at 100°F / 38°C)
| NPS (inch) | Schedule 40 Working Pressure (psi) | Schedule 40 Working Pressure (MPa) |
|---|
| 1/2″ | 3,000 | 20.7 |
| 1″ | 2,600 | 17.9 |
| 2″ | 1,800 | 12.4 |
| 3″ | 1,600 | 11.0 |
| 4″ | 1,400 | 9.7 |
| 6″ | 1,100 | 7.6 |
| 8″ | 950 | 6.6 |
| 10″ | 870 | 6.0 |
| 12″ | 760 | 5.2 |
Per ASME B31.3. Pressure decreases at elevated temperatures. Contact us for temperature derating.
Key Features
- Standard Wall Thickness – Widely available and interchangeable
- Good Pressure Rating – Suitable for most process and utility applications
- Excellent Corrosion Resistance – 304 for general service; 316 for marine/chemical
- Cost-Effective – Balance between strength and material cost
- Weldable – Excellent weldability with standard methods
- Threadable – Sufficient wall thickness for threading (NPS 2″ and below)
- Available in Seamless or Welded – Options for different pressure requirements
Schedule Comparison (2″ NPS – 304 Stainless Steel)
| Schedule | Wall (mm) | Weight (kg/m) | Working Pressure (psi) | Relative Cost |
|---|
| 10S | 2.77 | 3.91 | 1,200 | Low |
| 40S | 3.91 | 5.44 | 1,800 | Medium |
| 80S | 5.54 | 7.48 | 2,400 | High |
Applications
- Process Piping – Chemical, petrochemical, and pharmaceutical lines
- Water Treatment – Potable water, reverse osmosis, and wastewater
- Food & Beverage – Dairy, brewery, and edible oil transfer
- HVAC – Chilled water, condenser water, and steam lines
- Oil & Gas – Utility and low-pressure process lines
- Fire Protection – Sprinkler system piping
- Structural – Handrails, supports, and frameworks
- Plumbing – Hot and cold water distribution
Contact Us
For inquiries, technical datasheets, or custom sizes, please contact our sales team.
