Xi'an Dongmeng Group Co., Ltd. is one of the most reliable manufacturers and suppliers of schedule 40 galvanized steel pipe in China, also supports customized service. With abundant experience, we warmly welcome you to wholesale cheap products in stock here and get free sample from our factory. For price consultation, contact us.
Schedule 40 hot dip galvanized steel pipe is one of the most widely used GI pipes for structural, water supply, and industrial applications. Manufactured in accordance with ASTM A53 and ASTM A106 standards, these pipes feature a durable zinc coating that provides excellent corrosion resistance, making them ideal for outdoor, humid, and marine environments.
As a professional galvanized steel pipe supplier, we offer a full range of SCH 40 galvanized pipes in various sizes, wall thicknesses, and finishes, ensuring compliance with international standards such as ASTM, API, and EN. Our products are widely exported to construction, oil & gas, agriculture, and infrastructure projects worldwide.
01
Excellent corrosion resistance
The hot -dip galvanized layer can effectively prevent steel pipes from being corroded in harsh environments and extend the service life.
02
Good mechanical properties
SCH40 Galvanized pipes have high pressure resistance and strength, and can withstand high temperature and pressure.
03
Extensive application scope
Due to multiple specifications and sizes, SCH40 galvanized pipes can meet the needs of different industries and use scenarios.
04
Beautiful appearance
Galvanizing layer adds a bright luster to the steel pipe, which enhances the overall beauty
What is Schedule 40 Hot Dip Galvanized Steel Pipe?
Schedule 40 Hot Dip Galvanized Steel Pipe (SCH40 GI Pipe) is a widely used carbon steel pipe defined by a standardized wall thickness and enhanced with a corrosion-resistant zinc coating through the hot-dip galvanizing process.
Schedule 40 (SCH40) refers to a pipe wall thickness classification system established under standards such as ASTM and ASME. It indicates a medium wall thickness, offering a balanced combination of strength, pressure resistance, and cost-effectiveness for general industrial and structural applications.
Hot Dip Galvanizing (HDG) is the core anti-corrosion process, in which the steel pipe is immersed in molten zinc (typically at ~450°C). This forms a metallurgically bonded zinc coating layer that protects the steel from rust and environmental degradation, significantly extending service life-especially in outdoor, humid, or corrosive environments.
Key Industry Insights
Compared to pre-galvanized pipes, hot dip galvanized pipes provide thicker zinc coating (typically 200–600 g/m²) and superior durability.
SCH40 pipes are commonly used in water transmission, fire protection systems, scaffolding, structural frameworks, and general piping systems.
Standards often include ASTM A53, ASTM A106, ASTM A123, and equivalent international specifications.
Key Features of SCH 40 Galvanized Pipe
Schedule 40 Hot Dip Galvanized Steel Pipe combines structural reliability with long-term corrosion protection, making it a practical choice across construction, infrastructure, and industrial piping systems.
1. Corrosion Resistance (Zinc Coating Protection)
The hot-dip galvanizing process forms a thick, metallurgically bonded zinc layer that shields the steel from moisture, oxygen, and chemicals.
👉 Application value: Ideal for outdoor structures, water pipelines, fire protection systems, and humid or coastal environments, where rust prevention is critical.
2. Long Service Life (Extended Lifespan)
Thanks to the durable zinc coating, SCH40 galvanized pipes can last decades with minimal maintenance, even under harsh environmental conditions.
👉 Application value: Reduces replacement frequency and lifecycle costs, making it highly suitable for municipal infrastructure, agricultural irrigation, and industrial facilities.
3. Mechanical Strength
SCH40 represents a medium wall thickness standard, providing excellent pressure resistance, load-bearing capacity, and structural stability.
👉 Application value: Widely used in scaffolding, structural frameworks, mechanical piping systems, and construction projects where both strength and safety are required.
4. Cost-Effective Solution
Compared to stainless steel or alloy pipes, galvanized steel offers a lower upfront cost while still delivering reliable corrosion protection and performance.
👉 Application value: A smart choice for large-scale projects and budget-sensitive engineering, balancing performance, durability, and cost efficiency.
Applications of Galvanized Steel Pipe
Hot Dip Galvanized Steel Pipe is widely used across multiple industries due to its corrosion resistance, durability, and cost-efficiency. Below are the key application areas with clear engineering value:
1. Water Supply & Plumbing Systems
Galvanized pipes are commonly used for water distribution, drainage, and irrigation systems. The zinc coating protects against internal rust and scaling.
👉 Application value: Ensures clean water delivery, reduced leakage risk, and long service life in residential, commercial, and municipal projects.
2. Fire Protection Systems
SCH40 galvanized pipes are widely applied in fire sprinkler and firefighting pipelines due to their pressure resistance and anti-corrosion performance.
👉 Application value: Provides reliable performance under high pressure and emergency conditions, meeting fire safety standards.
3. Construction & Structural Engineering
Used in scaffolding, steel frameworks, fencing, handrails, and support structures.
👉 Application value: Combines mechanical strength with weather resistance, making it ideal for both temporary and permanent structures.
4. Oil, Gas & Industrial Piping
Applied in low to medium pressure fluid transport systems, including air, water, oil, and gas pipelines.
👉 Application value: Offers a cost-effective alternative to alloy or stainless steel pipes in non-extreme environments.
5. Agricultural & Irrigation Systems
Extensively used in farmland irrigation, greenhouse structures, and water conveyance systems.
👉 Application value: Withstands outdoor exposure, soil moisture, and fertilizers, ensuring long-term reliability in agricultural operations.
6. HVAC & Mechanical Systems
Used in heating, ventilation, and air conditioning (HVAC) piping, as well as mechanical fluid systems.
👉 Application value: Provides stable performance, corrosion resistance, and easy installation in building service systems.
7. Electrical Conduit & Infrastructure
Galvanized pipes serve as protective conduits for electrical wiring and cable systems.
👉 Application value: Ensures mechanical protection and environmental resistance, improving safety and durability in infrastructure projects.
Hot Dip vs Pre-Galvanized Pipe
Understanding the difference between Hot Dip Galvanized Pipe (HDG) and Pre-Galvanized Pipe is essential for selecting the right material based on environment, durability, and budget.
| Feature | Hot Dip Galvanized Pipe (HDG) | Pre-Galvanized Pipe |
|---|---|---|
| Manufacturing Process | Steel pipe is fully immersed in molten zinc after fabrication | Steel strip is galvanized first, then formed into pipe |
| Zinc Coating Thickness | Thick coating (typically 200–600 g/m²) | Thin coating (typically 30–90 g/m²) |
| Corrosion Resistance | Excellent, suitable for harsh and outdoor environments | Moderate, suitable for indoor or dry environments |
| Coating Coverage | Full coverage (inside & outside) | Mainly external surface, weld areas may be weaker |
| Surface Appearance | Rougher, with visible zinc layer (spangle) | Smooth, cleaner and more uniform finish |
| Service Life | Long (20–50+ years depending on environment) | Shorter lifespan |
| Cost | Higher initial cost | Lower initial cost |
| Typical Standards | ASTM A53, ASTM A123 | ASTM A653 (coil), light-duty pipe standards |
Key Application Differences
Hot Dip Galvanized Pipe (HDG)
👉 Best for:
Outdoor construction
Water supply & fire protection systems
Marine and humid environments
Industrial and infrastructure projects
👉 Application value:
Delivers maximum corrosion protection + long service life, reducing maintenance and replacement costs over time.
Pre-Galvanized Pipe
👉 Best for:
Indoor structures
Furniture, light steel framing
Electrical conduits (dry environments)
👉 Application value:
Provides a cost-effective solution for non-corrosive environments, where high durability is not the primary concern.
Schedule 40 Hot Dip Galvanized Steel Pipe
Product Name: Schedule 40 Hot Dip Galvanized Steel Pipe
Alias: GI Pipe / Galvanized Iron Pipe / Zinc Coated Steel Pipe
Form: Round Pipe / Tube
Standards: ASTM A53 / ASTM A106 / API 5L
Applications: Water Supply / Construction / Scaffolding / Oil & Gas
Key Features: Corrosion Resistance / Long Service Life / Cost-Effective / High Strength
Galvanizing Specifications
| Item | Specification |
|---|---|
| Coating Method | Hot Dip Galvanized |
| Zinc Coating Thickness | 40–100 μm |
| Zinc Coating Weight | 300–600 g/m² |
| Surface Finish | Spangle / Smooth / Passivated / Oiled |
| Corrosion Protection | 20–50 years (depending on environment) |
Pipe Ends & Processing Options
| Type | Description |
|---|---|
| Plain End (PE) | Smooth cut |
| Beveled End (BE) | For welding |
| Threaded End (T&C) | With coupling |
| Grooved End | For fire protection systems |
Additional Processing Options
Cutting to custom lengths
Threading & coupling
Groove machining
Surface passivation
Anti-rust oil coating
Painting / PE coating (optional)
Schedule 40 Pipe size chart, dimensions, wall thickness and weight:
| Nominal size [inches] | Outside diameter [inches] | Outside diameter [mm] | Wall thickness [inches] | Wall thickness [mm] | Weight [lb/ft] | Weight [kg/m] |
| 1/8 inches | 0.405 inches | 10.3 MM | 0.068 inches | 1.73 MM | 0.24 lb/ft | 0.37 kg/m |
| 1/4 inches | 0.540 inches | 13.7 MM | 0.088 inches | 2.24 MM | 0.42 lb/ft | 0.84 kg/m |
| 1/2 inches | 0.840 inches | 21.3 MM | 0.109 inches | 2.77 MM | 0.85 lb/ft | 1.27 kg/m |
| 3/4 inches | 1.050 inches | 26.7 MM | 0.113 inches | 2.87 MM | 1.13 lb/ft | 1.69 kg/m |
| 1 inches | 1.315 inches | 33.4 MM | 0.133 inches | 3.38 MM | 1.68 lb/ft | 2.50 kg/m |
| 1 1/4 inches | 1.660 inches | 42.2 MM | 0.140 inches | 3.56 MM | 2.27 lb/ft | 3.39 kg/m |
| 1 1/2 inches | 1.900 inches | 48.3 MM | 0.145 inches | 3.68 MM | 2.72 lb/ft | 4.05 kg/m |
| 2 inches | 2.375 inches | 60.3 MM | 0.154 inches | 3.91 MM | 3.65 lb/ft | 5.44 kg/m |
| 2 1/2 inches | 2.875 inches | 73.0 MM | 0.203 inches | 5.16 MM | 5.79 lb/ft | 8.63 kg/m |
| 3 inches | 3.500 inches | 88.9 MM | 0.216 inches | 5.49 MM | 7.58 lb/ft | 11.29 kg/m |
| 3 1/2 inches | 4.000 inches | 101.6 MM | 0.226 inches | 5.74 MM | 9.11 lb/ft | 13.57 kg/m |
| 4 inches | 4.500 inches | 114.3 MM | 0.237 inches | 6.02 MM | 10.79 lb/ft | 16.07 kg/m |
| 5 inches | 5.563 inches | 141.3 MM | 0.258 inches | 6.55 MM | 14.62 lb/ft | 21.77 kg/m |
| 6 inches | 6.625 inches | 168.3 MM | 0.280 inches | 7.11 MM | 18.97 lb/ft | 28.26 kg/m |
| 8 inches | 8.625 inches | 219.1 MM | 0.322 inches | 8.18 MM | 28.55 lb/ft | 42.55 kg/m |
| 10 inches | 10.750 inches | 273.0 MM | 0.365 inches | 9.27 MM | 40.48 lb/ft | 60.31 kg/m |
| 12 inches | 12.750 inches | 323.8 MM | 0.406 inches | 10.31 MM | 53.52 lb/ft | 79.73 kg/m |
| 14 inches | 14 inches | 355.6 MM | 0.375 inches | 11.13 MM | 54.57 lb/ft | 94.55 kg/m |
| 16 inches | 16 inches | 406.4 MM | 0.500 inches | 12.70 MM | 82.77 lb/ft | 123.30 kg/m |
| 18 inches | 18 inches | 457.0 MM | 0.562 inches | 14.27 MM | 104.67 lb/ft | 155.80 kg/m |
| 20 inches | 20 inches | 508.0 MM | 0.594 inches | 15.09 MM | 123.11 lb/ft | 183.42 kg/m |
| 24 inches | 24 inches | 610.0 MM | 0.688 inches | 17.48 MM | 171.29 lb/ft | 255.41 kg/m |
| 32 inches | 32 inches | 813.0 MM | 0.688 inches | 17.48 MM | 230.08 lb/ft | 342.91 kg/m |
Grades of Schedule 40 Steel Pipe
Regarding the different levels of Schedule 40 steel pipes (Grades), the following provides more professional and specific specifications information. This information is mainly based on ASTM (American Materials and Test Association) and other related standards:
Standard specifications: meet ANSI B36.10/19M standards.
Size range: The size range of DN15 to DN600 (that is, 1/2 "to 24") is usually provided, but it may also be different according to the needs of manufacturers and customers.
Wall thickness: Schedule 40 wall thickness, the specific value may vary from the pipeline size, but the wall thickness is usually about 2.77mm to 7.94mm (for pipelines of different sizes).
Power: minimum yield strength is 35,000 PSI (241 MPa), and the minimum tensile strength is 60,000 PSI (414 MPa).
Application: Widely used in the fields of construction, water supply, drainage system, oil and natural gas transportation.
Standard specifications: It also meets ANSI B36.10/19M standards.
Size range: Similar to ASTM A53 Grade B, providing a wide range of size choices.
Wall thickness: Schedule 40 wall thickness, the specific value depends on the size of the pipeline.
Power: minimum yield strength and tensile strength are the same as ASTM A53 Grade B, with 35,000 PSI (241 MPA) and 60,000 PSI (414 MPa).
Application: It is especially suitable for high temperature environments, such as steam and gas pipelines, refineries and chemical factories.
Standard specifications: Following the API 5L standard, this standard focuses on petroleum and natural gas transportation pipelines.
Size range: usually provides a large size range to meet the needs of long -distance pipeline transportation.
Wall thickness: Schedule 40 wall thickness, but the specific values may vary from pipeline size and pressure level.
Power: minimum yield strength and tensile strength are also 35,000 PSI (241 MPA) and 60,000 PSI (414 MPa).
Application: Widely used in the oil and natural gas industries, especially for long -distance conveying pipelines.
Standard specifications: meet the ASTM A333 standard, which is focused on steel pipes in low temperature environments.
Dimensions: Provide a specific size range suitable for low -temperature environments.
Wall thickness: Schedule 40 wall thickness, but the specific value may vary from the duct size and the required low temperature performance.
Power: Although the minimum yield strength and tensile strength are the same as the above level, the ASTM A333 Grade 6 pays special attention to the strength and toughness at low temperature.
Application: It is mainly used for liquefied natural gas (LNG) factories and other places that require low temperature services.
Material: All the above levels are made of carbon steel, but the specific chemical composition and mechanical performance may vary from the level.
Surface treatment: Galvanized, painted or other surface treatment can be performed according to customer needs.
Customized services: Many manufacturers provide customized services that can produce Schedule 40 steel pipes with different sizes, wall thickness and materials according to the specific needs of customers.
In short, when selecting the Schedule 40 steel pipe, we must consider factors such as its level, size, wall thickness, strength, and application environment to ensure the specific needs of the selected products meet the specific needs of the project.
SCH 40 Nominal pipe size (NPS)
| NPS | 1/2 | 3/4 | 1 | 1¼ | 1½ | 2 | 2½ | 3 | 3½ | 4 |
| DN | 15 | 20 | 25 | 32 | 40 | 50 | 65 | 80 | 90 | 100 |
Notes:
For NPS ≥ 4, the related DN = 25 multiplied by the NPS number.
From NPS 12 and above the wall thickness between SCH 40 and STD are different, from NPS 10 and above the wall thickness between schedule 80 and XS are different.
Schedule 40 Carbon Steel Pipe Pressure Rating
- 1 in (inch) = 25.4 mm
- 1 psi (lb/in2) = 6,894.8 Pa (N/m2) = 6.895x10-2 bar
| Maximum Allowable Pressure (psi) (kPa) | ||
| NPS | Outside Diameter (OD) | Schedule |
| (in) | (in) (mm) | 40 |
| 1/4 | 0.54 13.7 | 7985 55057 |
| 3/8 | 0.675 17.1 | 6606 45548 |
| 1/2 | 0.84 21.3 | 6358 43838 |
| 3/4 | 1.05 26.7 | 5273 36357 |
| 1 | 1.315 33.4 | 4956 34172 |
| 1 1/4 | 1.66 42.2 | 4133 28497 |
| 1 1/2 | 1.9 48.3 | 3739 25780 |
| 2 | 2.375 60.3 | 3177 21905 |
| 2 1/2 | 2.875 73 | 3460 23857 |
| 3 | 3.5 88.9 | 3024 20850 |
| 3 1/2 | 4 102 | 2769 19092 |
| 4 | 4.5 114 | 2581 17796 |
| 5 | 5.563 141 | 2273 15672 |
| 6 | 6.625 168 | 2071 14280 |
| 8 | 8.625 219 | 1829 12611 |
| 10 | 10.75 273 | 1664 11473 |
| 12 | 12.75 324 | 1560 10756 |
| 14 | 14 356 | 1533 10570 |
| 16 | 16 406 | 1531 10556 |
| 18 | 18 457 | 1530 10549 |
| 20 | 20 508 | 1455 10032 |
| 22 | 22 559 | |
| 24 | 24 610 | 1405 9687 |
| 30 | 30 762 | |
| 32 | 32 813 | 1054 7267 |
| 34 | 34 864 | 992 6840 |
| 36 | 36 914 | 1021 7040 |
| 42 | 42 1067 | 875 6033 |
Schedule 40 Pipe Dimensions and Wall Thickness
| Pipe Sizes* | O.D. (in.) | Schedule (40) Pipe Wall Thickness (in.)** |
|
| Sch.40 | |||
| Wall (in) | I.D. (in) | ||
| 1/8" | 0.41 od | 0.07 in | 0.269 id |
| Weight (lbs/ft.) | Steel | 0.247 lbs/ft | |
| Stainless | |||
| Aluminum | |||
| 1/4" | 0.54 od | 0.090 in | 0.364 id |
| Weight (lbs/ft.) | Steel | 0.429 lbs/ft | |
| Stainless | |||
| Aluminum | 0.147 lbs/ft | ||
| 3/8" | 0.675 od | 0.091 in | 0.493 id |
| Weight (lbs/ft.) | Steel | 0.570 lbs/ft | |
| Stainless | |||
| Aluminum | 0.196 lbs/ft | ||
| 1/2" | 0.840 od | 0.109 in | 0.622 id |
| Weight (lbs/ft.) | Steel | 0.850 lbs/ft | |
| Stainless | |||
| Aluminum | 0.294 lbs/ft | ||
| 3/4" | 1.050 od | 0.113 in | 0.824 id |
| Weight (lbs/ft.) | Steel | 1.13 lbs/ft | |
| Stainless | |||
| Aluminum | 0.391 | ||
| 1" | 1.315 od | 0.133 in | 1.049 id |
| Weight (lbs/ft.) | Steel | 1.68 lbs/ft | |
| Stainless | |||
| Aluminum | 0.581 lbs/ft | ||
| 1-1/4" | 1.66 od | 0.140 in | 1.380 id |
| Weight (lbs/ft.) | Steel | 2.27 lbs/ft | |
| Stainless | |||
| Aluminum | 0.785 lbs/ft | ||
| 1-1/2" | 1.90 od | 0.145 in | 1.610 id |
| Weight (lbs/ft.) | Steel | 2.72 lbs/ft | |
| Stainless | |||
| Aluminum | 0.939 lbs/ft | ||
| 2" | 2.375 od | 0.154 in | 2.067 id |
| Weight (lbs/ft.) | Steel | 3.66 lbs/ft | |
| Stainless | |||
| Aluminum | 1.260 lbs/ft | ||
| 2-1/2" | 2.875 od | 0.203 in | 2.469 id |
| Weight (lbs/ft.) | Steel | 5.80 lbs/ft | |
| Stainless | |||
| Aluminum | 2.000 lbs/ft | ||
| 3" | 3.50 od | 0.216 in | 3.068 id |
| Weight (lbs/ft.) | Steel | 7.58 lbs/ft | |
| Stainless | |||
| Aluminum | 2.620 lbs/ft | ||
| 3-1/2" | 4.00 od | 0.226 in | 3.550 id |
| Weight (lbs/ft.) | Steel | 9.12 lbs/ft | |
| Stainless | |||
| Aluminum | 3.150 lbs/ft | ||
| 4" | 4.50 od | 0.237 in | 4.026 id |
| Weight (lbs/ft.) | Steel | 10.80 lbs/ft | |
| Stainless | |||
| Aluminum | 3.730 lbs/ft | ||
| 5" | 5.563 od | 0.258 in | 5.047 id |
| Weight (lbs/ft.) | Steel | 14.63 lbs/ft | |
| Stainless | |||
| Aluminum | 5.050 lbs/ft | ||
| 6" | 6.625 od | 0.280 in | 6.065 id |
| Weight (lbs/ft.) | Steel | 18.99 lbs/ft | |
| Stainless | |||
| Aluminum | 6.560 lbs/ft | ||
| 8" | 8.625 od | 0.322 in | 7.981 id |
| Weight (lbs/ft.) | Steel | 28.58 lbs/ft | |
| Stainless | |||
| Aluminum | 9.88 lbs/ft | ||
| *Nominal sizes apply - Pipe Size is the generic Industry Size Standard for reference only **Tolerances may vary slightly from each manufacturer | |||
sch 40 pipe dimensions
| Pipe Size* |
O.D. |
Schedule (40) |
|
|---|---|---|---|
| Sch.40 | |||
| Wall (in) | I.D. (in) | ||
| 1/8" | 0.41 od | 0.07 in | 0.269 id |
| Weight (lbs/ft.) |
Steel | 0.247 lbs/ft | |
| Stainless | |||
| Aluminum | |||
| 1/4" | 0.54 od | 0.090 in | 0.364 id |
| Weight (lbs/ft.) |
Steel | 0.429 lbs/ft | |
| Stainless | |||
| Aluminum | 0.147 lbs/ft | ||
| 3/8" | 0.675 od | 0.091 in | 0.493 id |
| Weight (lbs/ft.) |
Steel | 0.570 lbs/ft | |
| Stainless | |||
| Aluminum | 0.196 lbs/ft | ||
| 1/2" | 0.840 od | 0.109 in | 0.622 id |
| Weight (lbs/ft.) |
Steel | 0.850 lbs/ft | |
| Stainless | |||
| Aluminum | 0.294 lbs/ft | ||
| 3/4" | 1.050 od | 0.113 in | 0.824 id |
| Weight (lbs/ft.) |
Steel | 1.13 lbs/ft | |
| Stainless | |||
| Aluminum | 0.391 | ||
| 1" | 1.315 od | 0.133 in | 1.049 id |
| Weight (lbs/ft.) |
Steel | 1.68 lbs/ft | |
| Stainless | |||
| Aluminum | 0.581 lbs/ft | ||
| 1-1/4" | 1.66 od | 0.140 in | 1.380 id |
| Weight (lbs/ft.) |
Steel | 2.27 lbs/ft | |
| Stainless | |||
| Aluminum | 0.785 lbs/ft | ||
| 1-1/2" | 1.90 od | 0.145 in | 1.610 id |
| Weight (lbs/ft.) |
Steel | 2.72 lbs/ft | |
| Stainless | |||
| Aluminum | 0.939 lbs/ft | ||
| 2" | 2.375 od | 0.154 in | 2.067 id |
| Weight (lbs/ft.) |
Steel | 3.66 lbs/ft | |
| Stainless | |||
| Aluminum | 1.260 lbs/ft | ||
| 2-1/2" | 2.875 od | 0.203 in | 2.469 id |
| Weight (lbs/ft.) |
Steel | 5.80 lbs/ft | |
| Stainless | |||
| Aluminum | 2.000 lbs/ft | ||
| 3" | 3.50 od | 0.216 in | 3.068 id |
| Weight (lbs/ft.) |
Steel | 7.58 lbs/ft | |
| Stainless | |||
| Aluminum | 2.620 lbs/ft | ||
| 3-1/2" | 4.00 od | 0.226 in | 3.550 id |
| Weight (lbs/ft.) |
Steel | 9.12 lbs/ft | |
| Stainless | |||
| Aluminum | 3.150 lbs/ft | ||
| 4" | 4.50 od | 0.237 in | 4.026 id |
| Weight (lbs/ft.) |
Steel | 10.80 lbs/ft | |
| Stainless | |||
| Aluminum | 3.730 lbs/ft | ||
| 5" | 5.563 od | 0.258 in | 5.047 id |
| Weight (lbs/ft.) |
Steel | 14.63 lbs/ft | |
| Stainless | |||
| Aluminum | 5.050 lbs/ft | ||
| 6" | 6.625 od | 0.280 in | 6.065 id |
| Weight (lbs/ft.) |
Steel | 18.99 lbs/ft | |
| Stainless | |||
| Aluminum | 6.560 lbs/ft | ||
| 8" | 8.625 od | 0.322 in | 7.981 id |
| Weight (lbs/ft.) |
Steel | 28.58 lbs/ft | |
| Stainless | |||
| Aluminum | 9.88 lbs/ft | ||
| *Nominal sizes apply - Pipe Size is the generic Industry Size Standard for reference only **Tolerances may vary slightly from each manufacturer |
|||
What is the difference between SCH40 and SCH40s?
SCH40 and SCH40s are two different standard specifications commonly used in piping systems. Here are the key differences between them:
Wall Thickness:
SCH40 represents a standard wall thickness for piping. It is typically used to denote pipes of medium thickness.
SCH40s, on the other hand, represents a slightly thicker wall than SCH40. It is an upgraded version of SCH40 with an additional layer of wall thickness to enhance pressure resistance.
Pressure Resistance:
Due to its standard wall thickness, SCH40 pipes are suitable for general industrial and construction applications where moderate pressure resistance is required.
SCH40s pipes, with their thicker walls, offer greater pressure resistance and are therefore more suitable for industrial applications that require high-pressure tolerance.
Applicability:
SCH40 pipes are commonly used in general piping systems where standard wall thickness is sufficient.
SCH40s pipes are often chosen for applications in industries where higher pressures and temperatures are encountered, such as chemical plants and nuclear power stations.
Standards and Specifications:
SCH40 typically follows American standards, such as ANSI B36.10.
SCH40s, however, may follow different international standards, although it is sometimes associated with European standards like EN 10220. It's worth noting that the specific standards and specifications may vary depending on the manufacturer and the country of origin.
Schedule 40 vs Schedule 80 Galvanized Pipe
| Feature | Schedule 40 | Schedule 80 |
|---|---|---|
| Wall Thickness | Medium | Thick |
| Strength | Standard | Higher |
| Weight | Lighter | Heavier |
| Cost | Lower | Higher |
| Application | General use | High-pressure systems |
Inspection & Quality Assurance
We implement a strict quality control system to ensure every Sch 40 galvanized steel pipe meets international standards:
Raw material inspection (chemical & mechanical testing)
Online production monitoring
Zinc coating thickness testing
Hydrostatic pressure testing
Third-party inspection (SGS, BV, TUV available)
Certifications
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Our factory & quipment
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Why Choose Our Galvanized Steel Pipe
Choosing the right supplier is just as important as selecting the right material. Our Hot Dip Galvanized Steel Pipe (SCH40 GI Pipe) is engineered to deliver consistent quality, long-term durability, and global project reliability.
1. Premium Zinc Coating for Superior Corrosion Protection
We apply strict hot-dip galvanizing processes with controlled zinc thickness to ensure strong adhesion and uniform coverage.
👉 Value: Longer service life in outdoor, marine, and industrial environments, reducing maintenance and replacement costs.
2. Strict Compliance with International Standards
Our products meet major global standards, including:
ASTM A53 / ASTM A106
ASTM A123 (galvanizing)
EN / DIN equivalents
👉 Value: Ensures project compliance, easier approval, and seamless use in international EPC projects.
3. Accurate Dimensions & SCH40 Wall Thickness Control
We maintain tight tolerances on outer diameter, wall thickness (Schedule 40), and length.
👉 Value: Guarantees easy installation, system compatibility, and stable mechanical performance in structural and piping applications.
4. Reliable Mechanical Performance
Our pipes offer excellent strength, pressure resistance, and structural integrity.
👉 Value: Suitable for construction, fire protection systems, water pipelines, and industrial use, ensuring safety and durability.
5. Full Quality Inspection & Traceability
Each batch undergoes comprehensive inspection, including:
Chemical composition analysis
Mechanical testing (tensile, yield)
Coating thickness testing
Visual & dimensional inspection
👉 Value: Provides consistent quality assurance and full traceability, reducing project risk.
6. Flexible Supply & Global Export Experience
Wide range of sizes and specifications available
Custom lengths, threading, and coating options
Professional export packaging and logistics support
👉 Value: Meets diverse project requirements and ensures on-time delivery worldwide.
7. Cost-Effective Engineering Solution
We balance competitive pricing with high quality, helping clients optimize procurement budgets.
👉 Value: Achieves the best performance-to-cost ratio for large-scale infrastructure and industrial projects.
Product Delivery Standards
Standard export seaworthy packaging
Bundled with steel strips + plastic caps
Custom marking & labeling available
Length: 5.8m / 6m / 12m or customized
Fast delivery for bulk orders
gi pipe schedule 40 where to buy
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FAQ – Galvanized Steel Pipe (SCH40 GI Pipe)
1. What is Schedule 40 galvanized steel pipe?
Schedule 40 galvanized steel pipe is a standard wall thickness pipe defined by ASME under B36.10. It features a zinc-coated surface (galvanization) to provide corrosion resistance and is widely used in construction, water systems, and industrial pipelines.
2. What does "Schedule 40" mean?
"Schedule 40" refers to the wall thickness of the pipe. Compared to other schedules like Schedule 80, it offers a balanced combination of strength, weight, and cost, making it ideal for medium-pressure applications.
3. What standards apply to galvanized steel pipes?
Common international standards include:
ASTM A53
ASTM A106
ASME B36.10
EN 10255 / BS 1387
These ensure consistent dimensions, mechanical properties, and coating quality.
4. What is the difference between galvanized pipe and GI pipe?
There is no real difference. "GI pipe" (Galvanized Iron pipe) is simply another name for galvanized steel pipe used in many regions and industries.
5. Is Schedule 40 galvanized pipe strong enough?
Yes. Schedule 40 pipe provides sufficient strength for most applications, including water supply, structural frameworks, and general industrial use. For higher pressure systems, Schedule 80 may be recommended.
6. What sizes are available for Sch 40 galvanized pipe?
Typical sizes range from 1/2 inch to 12 inches, with full compliance to ASME standards. Custom sizes and lengths are also available depending on project requirements.
7. What is the coating thickness of galvanized steel pipe?
Hot-dip galvanized pipes usually have a zinc coating thickness of 40–85 μm, depending on the standard and application. This coating protects the pipe from corrosion and extends its service life.
8. What is the lifespan of galvanized steel pipe?
Galvanized steel pipes typically last 20 to 50 years, depending on environmental conditions such as humidity, water quality, and exposure to chemicals.
9. Can Schedule 40 galvanized pipe be used for water supply?
Yes, it is widely used for water supply systems. However, for drinking water, compliance with local health and safety standards is recommended.
10. What is the pressure rating of Schedule 40 galvanized pipe?
The pressure rating depends on pipe size and material grade (e.g., ASTM A53). In general, Schedule 40 pipes are suitable for medium-pressure applications.
11. What is the difference between Schedule 40 and Schedule 80?
Schedule 80 pipes have thicker walls, higher pressure resistance, and greater weight, while Schedule 40 pipes are lighter, more cost-effective, and suitable for general applications.
12. How is galvanized steel pipe manufactured?
The process includes:
Steel pipe forming (seamless or welded)
Surface cleaning and pickling
Hot-dip galvanizing (zinc coating)
Inspection and testing
13. Is galvanized pipe suitable for outdoor use?
Yes. The zinc coating provides excellent resistance against rust and weather conditions, making it ideal for outdoor and exposed environments.
14. What are the common applications of Sch 40 galvanized pipe?
Construction structures
Water distribution systems
Scaffolding
Agricultural irrigation
Fire protection systems
15. How to choose a reliable galvanized pipe supplier?
Look for suppliers who:
Comply with ASTM / ASME standards
Provide mill test certificates (MTC)
Offer third-party inspection (SGS, BV)
Have export experience and stable delivery capability
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