Schedule 40 steel pipe is one of the most widely used carbon steel pipe types in construction, manufacturing, and fluid transportation. Its balanced wall thickness and high pressure-bearing capacity make it ideal for both commercial and industrial applications.
What Is Schedule 40 Steel Pipe?
Schedule 40 refers to the wall thickness of a steel pipe as defined by the ANSI B36.10 standard. It’s not a measurement in millimeters or inches, but rather a standard classification system that determines how much pressure the pipe can handle based on its nominal pipe size (NPS) and wall thickness.
Key Characteristics:
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Material: Carbon Steel (ASTM A53, A106, API 5L, etc.)
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Nominal Pressure Rating: Up to 150–300 psi depending on size
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Outer Diameter (OD): Consistent for each nominal size
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Wall Thickness: Moderate (varies by NPS)
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Ends: Plain, beveled, or threaded
Schedule 40 Steel Pipe Thickness Chart (ASTM A53)
| NPS (inches) | Outside Diameter (OD) | Wall Thickness (mm) | Wall Thickness (inches) |
|---|---|---|---|
| 1/2″ | 21.3 mm | 2.77 mm | 0.109″ |
| 1″ | 33.4 mm | 3.38 mm | 0.133″ |
| 2″ | 60.3 mm | 3.91 mm | 0.154″ |
| 4″ | 114.3 mm | 6.02 mm | 0.237″ |
| 6″ | 168.3 mm | 7.11 mm | 0.280″ |
| 10″ | 273.1 mm | 9.27 mm | 0.365″ |
| 12″ | 323.9 mm | 9.53 mm | 0.375″ |
Schedule 40 Pipe Weight Chart (Kg/m)
| NPS | OD (mm) | Wall Thickness | Weight (Kg/m) |
|---|---|---|---|
| 1″ | 33.4 | 3.38 mm | 3.38 |
| 2″ | 60.3 | 3.91 mm | 5.44 |
| 4″ | 114.3 | 6.02 mm | 14.98 |
| 6″ | 168.3 | 7.11 mm | 28.26 |
| 10″ | 273.1 | 9.27 mm | 69.14 |
Pressure Rating Guide (Approximate)
| NPS | Pipe Material | Max Pressure (psi) | Temperature (°F) |
|---|---|---|---|
| 1″ | ASTM A53 B | 850 | 100°F |
| 2″ | ASTM A106 B | 650 | 400°F |
| 4″ | API 5L Gr. B | 480 | 400°F |
| 6″ | ASTM A106 B | 370 | 500°F |
⚠️ Always consult design codes (e.g., ASME B31.3) for final pressure ratings depending on usage.
Chemical Composition (ASTM A53 Grade B)
| Element | Composition (%) |
|---|---|
| Carbon (C) | ≤ 0.30 |
| Manganese (Mn) | ≤ 1.20 |
| Phosphorus (P) | ≤ 0.05 |
| Sulfur (S) | ≤ 0.045 |
| Copper (Cu) | ≤ 0.40 |
| Nickel (Ni) | ≤ 0.40 |
Common Applications of Schedule 40 Steel Pipe
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Construction: Structural columns, beams, fencing
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Oil & Gas: Flowlines, pipelines, casings
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HVAC & Plumbing: Steam, water, air lines
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Irrigation: Underground water supply lines
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Fabrication: Frames, supports, brackets
Cutting, Welding & Fabrication Tips
Cutting:
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Use an abrasive saw or plasma cutter
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Coolant recommended for thick sizes
Welding:
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Suitable for MIG, TIG, and arc welding
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Preheat recommended for >6” thickness
Threading:
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NPT threading available for smaller diameters
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Use thread sealant to prevent leaks
Packaging & Delivery Options
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Length: 5.8m, 6m, 11.8m, or 12m standard
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Ends: Plain, threaded, beveled
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Coating: Black painted, galvanized, anti-rust oil
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Delivery: FOB/CFR/CIF available globally
Why Choose Shanxi Luokaiwei Steel Company?
At Shanxi Luokaiwei Steel Company, we specialize in high-quality Schedule 40 steel pipes at competitive prices. With ISO-certified production lines and a global shipping network, we ensure:
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📦 Fast delivery within 7–15 days
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🧪 Third-party quality testing reports
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🔍 Custom specifications on demand
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🌍 Worldwide export with full documentation support
📧 Contact us today at [email protected] or WhatsApp +86 18912200505 to get the latest factory price.