4″ Schedule 40 Steel Pipe refers to carbon steel pipe with a nominal pipe size of NPS 4 and Schedule 40 wall thickness. It is available in both seamless and ERW welded types. Manufactured in accordance with ASME B36.10, this medium-diameter pipe balances cost-effectiveness and pressure resistance, making it suitable for most engineering projects.
Glory Steel is a professional manufacturer and supplier of 4-inch schedule 40 steel pipe. We adopt premium carbon steel base material, supply all available grades, produce strictly in line with international standards, and our pipes are fully compatible with global pipe fittings.
Specifications
| Item | Details |
|---|---|
| Product | Sch 40 4’’ pipe |
| Material | ASTM A53 Gr.B, ASTM A106 Gr.B, S235JR, Q235B |
| Manufacturing Process | ERW Electric Resistance Welded, Seamless |
| Standards | ASME B36.10M, ASTM A53, ASTM A106 |
| Surface Finish | Black finish, anti-rust oil coated, hot-dip galvanized |
| Processing Services | Cut-to-length, threading, beveling, grooving, pipe end protection |
| MOQ | 10 tons |
| Packing | Hexagonal bundle packing |
Dimensions of 4” Sch 40 Steel Pipe
| Item | Metric Value | Inch Value |
|---|---|---|
| Nominal Pipe Size | NPS 4 | 4 inches |
| Outside Diameter | 114.3mm | 4.500 inches |
| Wall Thickness | 6.02mm | 0.237 inches |
| Inside Diameter | 102.3mm | 4.026 inches |
What is Schedule 40?
Schedule is a standard classification system for steel pipe wall thickness. A higher schedule number means thicker wall and higher pressure-bearing capacity. Schedule 40 is the globally adopted standard wall thickness grade. For small-bore pipes (NPS ≤ 10), Schedule 40 is equivalent to the traditional STD (Standard) wall-thickness marking.
SCH40 4” Steel Pipe Core Classification
- 4” SCH40 Seamless Pipe: Available in hot-rolled (Hot Finished/Hot Rolled) and cold-drawn (Cold Drawn) varieties. Hot-rolled seamless pipe is the mainstream choice, offering high cost-effectiveness, with a black surface and standard tolerances. Cold-drawn seamless pipe has stricter tolerances and is more expensive.
- 4” SCH40 ERW Pipe: Formed and welded from steel strip, using either hot-rolled or cold-rolled coils. Hot-rolled coils are the standard for export and have moderate costs. Compared to seamless pipe, 4” SCH40 ERW pipe is the mainstream choice in the market.
Features of SCH 40 4” Pipe
- Globally standard dimensions: Produced per international standards, compatible with all standard Sch40 4’’ pipe fittings worldwide.
- Reliable mechanical performance: Standard wall thickness guarantees good weldability and impact resistance with stable pressure resistance. The 102mm inner diameter ensures sufficient fluid throughput.
- Flexible processing: Full range of pipe end processing and anti-corrosion coating options including galvanizing and powder coating.
- Dual supply options: Both seamless and welded pipes available to fit different budgets and working conditions and improve construction efficiency.
Pressure Rating Reference
Note: The table shows typical system working pressure for reference only, NOT the ultimate burst pressure of the pipe.
| Working Condition | Pipe Type | OD(mm) | Wall Thickness(mm) | Working Pressure(psi) | Working Pressure(MPa) |
|---|---|---|---|---|---|
| General Service | ERW Pipe | 114.3 | 6.02 | 150 | 1.03 |
| Fire Protection | ERW Pipe | 114.3 | 6.02 | 300 | 2.07 |
| High Temperature Service | ERW Pipe | 114.3 | 6.02 | 792 | 5.46 |
| Ambient Temperature | Seamless A106 Gr.B | 114.3 | 6.02 | ~1,800 | ~12.4 |
| Steam Service | Seamless A106 Gr.B | 114.3 | 6.02 | 1,400 | 9.6 |
The pressure capacity of 4-inch SCH40 pipe varies significantly with temperature. Design pressure is 150 psi at ambient temperature, and it can still withstand 792 psi at high temperature (650°F, approx. 343°C).
Applications of Sch 40 4 Inch Pipe
- Steel Structure Construction: Large frames for logistics hubs, grain silos, base tubes for mechanical equipment.
- HVAC & Drainage: Large-volume chilled water and heating circulation pipelines for office buildings and shopping malls.
- Industrial Transportation: Conveying of regular process clean water and wastewater. Anti-corrosion coating or alternative material is recommended for acid & alkali corrosive environments.
- Agriculture & Municipal Works: Signposts for highway service areas, traffic light poles, crop irrigation and water pumping pipelines.
Theoretical Weight Reference
| Length | Approx. Weight |
|---|---|
| 1m | 16.07 kg |
| 3m | 48.2 kg |
| 6m | 96.4 kg |
| 12m | 192.8 kg |
Container Loading Reference
| Packing | 20ft Container | 40ft Container |
|---|---|---|
| 6m fixed length | Approx. 18-20 tons | Approx. 24-26 tons |
Due to its outer diameter, the loading capacity is limited by volume rather than weight.
FAQ
Q1: What is the difference between 4’’ SCH40 and 4’’ SCH80?
A: SCH80 has a thicker wall of 8.56mm. Both share the same OD of 114.3mm. SCH80 delivers higher pressure resistance, smaller inner diameter and heavier unit weight. SCH40 features standard 6.02mm wall, lighter weight, and lower cost.
Q2: Is 4’’ SCH 40 steel pipe welded or seamless?
A: 4’’ SCH 40 steel pipe is available in both welded and seamless versions. ERW welded pipe is cost-effective and the mainstream option. 4 schedule 40 galvanized steel pipe is also widely popular as an upgraded anti-rust variant.
Q3: Is 4 inch Schedule 40 steel pipe suitable for fire piping?
A: Yes, 4 inch Schedule 40 carbon steel pipe is widely adopted for fire sprinkler and fire water pipeline systems, which meets general fire engineering pressure requirements.
Q4: Can you provide material certificates?
A: We can supply EN10204 3.1/3.2 MTC mill test certificates, and support third-party inspection by SGS, BV.
Why Choose Glory Steel?
Glory Steel Plant, located in Tianjin, China, is an ISO 9001, ISO 14001, and CE-certified factory with an annual output of 100,000 tons. Specialize in manufacturing Schedule 40 Steel Pipe, including 6-inch Schedule 40 pipe, Sch 40 Galvanized Steel Pipe, and 2-inch Galvanized Steel Pipe. With our high-quality products and services, we export to over 120 countries.
