6-inch Schedule 40 pipe refers to carbon‑steel pipe of nominal size NPS 6 (6‑inch) with Schedule 40 wall thickness, a widely‑used medium‑bore industrial piping product. Actual outside diameter is 168.3 mm with standard wall thickness of 7.11 mm. It delivers ample flow capacity and stable pressure‑bearing performance.
Glory Steel is a professional manufacturer and supplier of 6’’ Schedule 40 Pipe. We mainly produce ASTM A53 Type E ERW welded pipes in this size, and custom‑fabricate ASTM A53 / A106‑B seamless pipes upon request. Compliant with diverse international standards, available finishes include black bare mill finish, hot‑dip galvanized, black varnish painted, and 3PE anti‑corrosion coating. We provide one‑stop customisation and export services.
Specifications
| Item | 6” Schedule 40 pipe |
|---|---|
| Material | ASTM A53 Gr.B, ASTM A106‑B, Q235B, S235JR |
| Nominal Size | NPS 6 (6 inch) |
| Manufacturing Process | ERW welded, seamless |
| Surface Finish | Black bare mill finish, hot‑dip galvanized |
| MOQ | 15 tons |
| Applicable Standards | ASME B36.10M, ASTM A53, ASTM A106‑B |
| Packaging | Standard export‑grade packaging |
Why is 6” Sch 40 Pipe Widely Adopted?
- Ample flow capacity: inner diameter approx.154 mm, delivering more than double the flow rate of 4‑inch pipe, ideal for main pipeline runs.
- Reliable strength: Schedule‑40 wall provides sufficient pressure resistance, operating pressure reaches 1.7‑2.0 MPa under ambient‑temperature service conditions.
- Broad standard compatibility: NPS 6 is a globally‑recognised standard size, with full availability of matching elbows, tees, flanges and joints for convenient procurement.
- Stable performance: moderate unit weight, good cold‑working and bending performance for easy transportation and field welding.
Dimensions
| Parameter | Value |
|---|---|
| Nominal Pipe Size (NPS) | 6 inch (DN150) |
| Outside Diameter (OD) | 168.3 mm |
| Wall Thickness (WT) | 7.11 mm |
| Inner Diameter (ID) | 154.1 mm |
| Theoretical Weight | 28.26 kg/m |
| Weight per 6‑meter fixed‑length piece | approx. 169.6 kg/pc |
| Length | 6 m fixed length (customisable from 1‑12 m) |
| Pipe End Type | Plain End (PE) / Beveled End (BE) / Threaded End (TE) |
Pipe‑end adaptation notes:
Plain End for welded connections; Beveled End for butt‑weld connections; Threaded End for threaded coupling connections.
Weight Reference
Approximate theoretical weights for 6‑inch Schedule 40 pipe at different lengths
| Length | Approx. Weight |
|---|---|
| 1 m | 28.26 kg |
| 3 m | 84.8 kg |
| 6 m (standard) | 169.6 kg |
| 12 m | 339.1 kg |
Material & Mechanical Properties
| Material Grade | Applicable Standard | Tensile Strength (MPa) | Yield Strength (MPa) | Elongation (%) |
|---|---|---|---|---|
| ASTM A53 Gr.B | ASTM A53 | ≥415 | ≥240 | ≥22 |
| ASTM A106 Gr.B | ASTM A106 | ≥415 | ≥240 | ≥22 |
| Q235B | GB/T 3091 | 375‑500 | ≥235 | ≥26 |
| 20# | GB/T 8163 | ≥410 | ≥245 | ≥25 |
| Q345B | GB/T 1591 | 470‑630 | ≥345 | ≥22 |
Supplementary note:
All grades achieve elongation ≥20 %, ensuring excellent weldability and bending workability. V‑notch impact energy ≥27 J at ambient temperature, suitable for low‑temperature operating conditions. Conventional working pressure ranges 2.5‑4.0 MPa; custom high‑pressure variants can reach up to 6.4 MPa with adequate safety margin.
Bursting Pressure & Working Pressure
| Pipe Type | OD (mm) | WT (mm) | Bursting Pressure (MPa) | Working Pressure (MPa) | Working Pressure (psi) |
|---|---|---|---|---|---|
| Seamless | 168.3 | 7.11 | ~12.7 | ~3.18 | ~461 |
| ERW Welded | 168.3 | 7.11 | ~10.8 | ~2.70 | ~392 |
Applications
- Fluid transportation: fire‑protection sprinkler piping, chemical‑plant drainage, municipal and building water supply‑drainage networks.
- HVAC: chilled‑water piping for large‑scale building central air‑conditioning systems.
- Structural framing: supports, frameworks, main posts and base components for large‑construction projects.
- Oil & gas transportation: low‑pressure gas and oil branch lines, compliant with API pipeline‑specification requirements.
Manufacturing Process
The mainstream production route for 6 Schedule 40 Pipe is ASTM A53 Type E high‑frequency electric‑resistance welding (ERW). The whole production line is precisely controlled with mature, stable process flow:
Hot‑rolled steel coil → roll forming → high‑frequency current fusion squeeze welding → internal & external weld‑bead trimming → sizing & straightening → hydrostatic test + ultrasonic inspection → dimensional re‑verification → finished‑product packaging.
Weld strength of ERW pipes approaches base‑metal properties and fully complies with ASTM A53 Type E, suitable for high‑volume engineering procurement. For high‑pressure, high‑temperature and high‑seal‑requirement services, custom seamless 6 Schedule 40 Pipe is available.
Product Variants
- 6’’ Schedule 40 Black bare mill finish: Original hot‑rolled pipe surface without extra anti‑corrosion coating. Cost‑effective for industrial piping and structural supports. Hot‑dip galvanising is recommended for improved rust resistance.
- 6’’ Schedule 40 galvanized Pipe: Black pipe substrate processed via hot‑dip galvanisation. Uniform zinc coating on inner and outer walls delivers outstanding corrosion resistance, silvery‑grey appearance, service life exceeding 20 years.
Container Loading Reference
| Packaging | 20GP Container | 40GP Container |
|---|---|---|
| 6 m fixed‑length | 18‑20 tons | 24‑26 tons |
6” Sch 40 Pipe vs 6” Sch 80 Pipe
Both share identical outer diameter and fully interchangeable fittings; differences lie in wall thickness, unit weight and pressure rating. Clear selection guidance as below:
| Comparison Item | 6 Schedule 40 Pipe | 6 Schedule 80 Pipe |
|---|---|---|
| OD | 168.3 mm | 168.3 mm |
| Wall Thickness | 7.11 mm | 10.97 mm |
| ID | 154.0 mm | 146.3 mm |
| Theoretical Weight | 28.2 kg/m | 42.5 kg/m |
| Pressure Rating | Medium‑low pressure | High‑pressure grade |
Selection suggestion:
Choose 6 Schedule 40 Pipe for civil‑use, municipal and medium‑low‑pressure projects. Choose 6 Schedule 80 Pipe for high‑pressure and harsh‑service‑condition projects.
Quality Inspection
Each batch of 6 Schedule 40 Pipe undergoes dimensional verification, visual inspection, hydrostatic testing, ultrasonic testing, mechanical‑property sampling and chemical‑composition analysis. Third‑party inspection services by SGS and BV are supported.
Why Choose Glory Steel
- Factory direct supply, with in-stock availability of both ERW welded and seamless 6-Schedule 40 pipes.
- Strictly adheres to ASTM and ASME international standards, providing complete customs clearance and acceptance documentation.
- Supports one-stop deep processing services including custom cutting, threading, galvanizing, and chamfering.
- Employs export-specific packaging solutions, suitable for ocean shipping. Supports small-batch trial orders; timely delivery for bulk orders.
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 producing low-carbon steel pipes(MS pipe), sizes including 1/2 inch to 10 inches, schedule 10 to schedule 80, shapes including round, square, and rectangle. With our high-quality products and services, we export to over 120 countries.
