The 3/4” galvanized steel pipe corresponds to DN20 in Chinese standards and NPS 3/4 in the American system. It is a circular hollow carbon steel section widely used in fluid transportation and steel structure engineering.
This pipe is available in multiple wall thickness grades and offers excellent corrosion resistance, strong versatility, and long service life.
Glory Steel, as a supplier and manufacturer of 3/4″ galvanized steel pipes, produces this product from high-quality welded black steel pipe through a hot-dip galvanizing process. We also provide end finishing and custom cut-to-length services.
Basic Specifications
| Item | Specification |
|---|---|
| Product Name | 3/4″ Galvanized Steel Pipe |
| Material | Q195, Q215, Q235B, Q345 |
| MOQ | 10 Tons |
| NPS | 3/4 inch |
| DN | DN20 |
| Outside Diameter | 26.7 mm |
| Length | 1–12 m (custom available) |
| Standards | ASTM A53, GB/T 3091, BS 1387, EN 10255 |
US Standard Material Equivalents:
- ASTM A53 Grade B ≈ Q235B
- ASTM A53 Grade A ≈ Q195 / Q215
Key Features of DN20 Galvanized Pipe
- Hot-Dip Galvanizing Process: The zinc-iron alloy layer bonds firmly with the base material, providing long-term rust protection in humid or outdoor environments.
- Standard Compatibility: The 3/4-inch size is internationally recognized and compatible with US, Chinese, and British standard pipe fittings and valves.
- Structural Strength: Excellent mechanical properties, good impact resistance, and easy to process.
- Cost-Effective: Under the same corrosion resistance conditions, galvanized pipe costs approximately 1/3 to 1/2 that of stainless steel pipe, making it an economical choice for both civil and industrial projects.
Weight Comparison by Schedule Grade
| Pipe Schedule | Wall Thickness (mm) | Wall Thickness (inch) | Theoretical Weight (kg/m) | Features |
|---|---|---|---|---|
| SCH10 | 2.11 | 0.083 | 1.08 | Thin wall, light duty |
| SCH20 | 2.41 | 0.113 | 1.17 | Medium-thin wall, civil use |
| SCH40 | 2.87 | 0.113 | 1.26 | Standard wall thickness |
| SCH80 | 3.91 | 0.120 | 1.58 | Thick wall, heavy duty |
Theoretical Weight Calculation Formula
Weight per meter (kg/m) = (OD − WT) × WT × 0.02466.
Example for 3/4″ SCH40:
(26.7 − 2.87) × 2.87 × 0.02466 ≈ 1.26 kg/m
Chemical Composition
| Element | C | Mn | P | S | Cu |
|---|---|---|---|---|---|
| Content (%) | ≤0.30 | ≤1.20 | ≤0.040 | ≤0.045 | ≤0.40 |
Applications
- Building Water Supply & Drainage: Water supply and drainage systems in residential and commercial buildings; also used as structural support frames.
- Industrial & Agricultural: Irrigation systems, drainage for ditches and rivers, industrial wastewater discharge, and transport of weak acids/alkalis.
- Electrical & Municipal: Conduit for electrical wiring, cable protection, and compressed air lines.
- Oil & Gas / HVAC: Heating, ventilation, air conditioning, and refrigeration branch lines; also used for gasoline and natural gas distribution piping.
Mechanical Properties
| Property | ASTM A53 Grade B | ASTM A53 Grade A |
|---|---|---|
| Tensile Strength (min) | ≥415 MPa (60,000 psi) | ≥330 MPa (48,000 psi) |
| Yield Strength (min) | ≥240 MPa (35,000 psi) | ≥205 MPa (30,000 psi) |
| Elongation | ≥22% (gauge 2″) | ≥25% (gauge 2″) |
| Hardness | ≤197 HB | ≤180 HB |
Engineering Pressure & Load Capacity Technical Data
| Parameter | SCH40 | SCH80 |
|---|---|---|
| Max Working Pressure (Room Temp.) | 2.5 MPa | 3.8 MPa |
| Ultimate Burst Pressure | ≥8.0 MPa | ≥11.5 MPa |
| Static Structural Load Capacity | ≥800 kg/m | ≥1200 kg/m |
| Typical Zinc Coating Weight | 40–120 g/m² | 80–200 g/m² |
| Service Temperature Range | -20°C to 120°C | -20°C to 120°C |
| Standard Service Life (Indoor) | 15–25 years | 20–30 years |
| Standard Service Life (Outdoor) | 8–15 years | 12–20 years |
Manufacturing Process of 3/4″ Galvanized Pipe
Hot-rolled steel coil → Slitting into strips → Welding into black pipe → Alkaline degreasing → Acid pickling → Continuous hot-dip galvanizing → Cooling & passivation → Bundling (hexagonal bundles, fixed with steel straps at both ends) → Export packaging
Optional Packaging:
- Plastic pipe cap protection
- Waterproof tarpaulin covering
- Bare container loading
- Custom packaging available upon request
Container Loading Reference
| Pipe Length | 20′ Container | 40′ Container |
|---|---|---|
| 6m Fixed Length | 22 Tons | 28 Tons |
| 3m Fixed Length | 20 Tons | 26 Tons |
Why Choose Glory Steel?
- Factory Direct: We own our galvanizing production line and pipe processing workshop. We maintain ample stock of 1″–4″ GI pipes and support custom sizes with OEM/ODM services.
- Quality Assurance: All steel pipes strictly comply with Chinese, American, and other international standards. Dimensional accuracy, pressure ratings, load capacity, and zinc coating thickness are precisely controlled with full quality inspection throughout production.
- One-Stop Supply: We offer a complete range of galvanized pipes and matching fittings, including elbows, tees, reducers, flanges, couplings, and pipe caps.
- Value-Added Processing: We provide secondary processing services such as cutting, threading, bending, and drilling. Large orders are scheduled and delivered on time according to production requirements.
Glory Steel factory, 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 SCH10-SCH80 galvanized pipes, with popular diameters including 1/2”, 3/4”, 1”, 1.5 inch, 2”, and 3 inch. Custom sizes are also available.. With our high-quality products and services, we export to over 120 countries.
Mon-Fri: 8:00 – 18:00 (GMT+8)
