1 Inch Galvanized Pipe

Specifications

Item	1“ Galvanized Steel Pipe
Nominal Diameter	1” / DN25
OD	33.4mm (ASTM A53) / 33.7mm (GB/T 3091)
WT	2.0mm, 2.5mm, 2.75mm, 3.0mm, 3.2mm
Length	6 meters, customizable
Material	Q195, Q215, Q235
Production Process	ERW Welding + Hot-dip Galvanizing
Zinc Coating	Z30 – Z275
Standards	GB/T 3091, ASTM A53 Grade A/B, BS1387
MOQ	10 Tons

Advantages

1. Excellent Anti-corrosion & Rust Resistance Protected by uniform zinc coating, the service life of the pipe is greatly extended. We can customize thicker zinc layers to resist oxidation for projects working under harsh environments.
2. Flexible Secondary Processing It can be buried underground without melting or releasing harmful gas. Available processing operations include cutting, threading, welding, cold bending and hot bending. NPT (American standard) or BSPT (British standard) threaded ends can be customized.
3. Cost-effective & Universal Standard Manufactured in accordance with global unified standards, perfectly matched with standard pipe fittings, valves and connectors worldwide. Low maintenance cost, service life reaches 15-30 years.
4. Superior Mechanical Performance Stable pressure resistance, tensile strength and yield strength, anti-ultraviolet and sun-resistant. It can be used both as structural supports and fluid delivery pipelines.

Application Fields

• Plumbing & Fire Protection: Low-pressure natural gas & coal gas transmission pipelines, water supply supporting pipes for modular prefabricated houses.
• Building Structure: Construction support tubes, temporary site bracing pipes, guardrail support poles for parks and scenic spots.
• Municipal & Traffic Works: Low-pressure drainage pipes, underground domestic sewage pipes, small highway support poles.
• Machinery & Industrial Equipment: Horizontal & vertical guardrail posts, cable conduit for optical fiber & wires, base tubes for fitness equipment.

Unit Conversion Table for 1″ GI Pipe

Parameter	Metric (mm)	Imperial (inch)
DN Nominal Diameter	25	1″
Outer Diameter OD	33.4 – 33.7	1.315″
Wall Thickness WT	2.0 / 2.5 / 2.75 / 3.0 / 3.2	0.079″ – 0.126″
Standard Length	6m / Customized	19.7 ft / Customized

Common Wall Thickness & Theoretical Weight

• Conversion Reference: 1 kg/m ≈ 0.672 lb/ft.

Wall Thickness (mm)	Imperial WT (inch)	Theoretical Weight (kg/m)	Weight per Foot (lb/ft)
2.0	0.079	≈1.55	≈1.04
2.5	0.098	≈1.90	≈1.28
2.75 (12 Gauge)	0.108	≈2.07	≈1.39
3.0	0.118	≈2.25	≈1.51
3.2 (10 Gauge / SCH40)	0.126	≈2.40	≈1.61

Weight Calculation Formula

Weight per meter (kg/m) = Hot-dip galvanizing weight gain coefficient (≈1.03-1.04) × 0.02466 × (OD – WT) × WT.

• WT = Wall Thickness
• OD = Outer Diameter

Note: 0.02466 is the carbon steel density conversion factor; the 1.03-1.04 weight gain coefficient is applicable for all hot-dip galvanized steel pipes.

Comparison of Base Material Grades

Our 1-inch ERW galvanized pipes adopt three types of low-carbon steel substrates: Q195, Q215, and Q235. Each grade differs in chemical composition and mechanical properties for targeted project customization.

• Q195: High ductility, ideal for precise deep processing.
• Q215: Balanced performance with competitive cost.
• Q235: Optimal tensile & yield strength, the mainstream grade for engineering projects.

Chemical Composition

Grade	Carbon (C)	Manganese (Mn)	Silicon (Si)	Sulfur (S)	Phosphorus (P)
Q195	0.06-0.12%	0.25-0.50%	≤0.30%	≤0.045%	≤0.05%
Q215	0.09-0.15%	0.25-0.55%	≤0.30%	≤0.05%	≤0.045%
Q235	0.12-0.20%	0.30-0.67%	≤0.30%	≤0.045%	≤0.04%

Mechanical Properties

Grade	Min Yield Strength (MPa)	Tensile Strength (MPa)	Min Elongation After Fracture (%)
Q195	195	315-430	33
Q215	215	335-450	27
Q235	235	375-500	26

Full Production Process

Hot-rolled / Cold-rolled steel strip (Q195/Q215/Q235) → High-frequency ERW welding → Weld seam finishing → Fixed-length cutting → Pickling to remove oxide scale → Hot dipping in molten zinc → Cooling & passivation → Straightening → Full inspection → Packing & warehousing.

Pipe Connection Methods

1. Threaded Connection (Nipple Joint): The most widely adopted method, matched with elbows, tees, straight couplings and other fittings. Thread standards available: NPT (American) and BSPT (British).
2. Grooved Connection: Assembled by pipe clamps, fast installation, perfect for fire protection and water supply projects.
3. Custom Connections: Flange connection or butt welding for special working conditions.

FAQs

1. Can galvanized steel pipes be used for hot water systems?

Not recommended. Zinc coating may peel off under water temperature above 60℃. Stainless steel pipes or copper pipes are better alternatives for hot water pipelines.

2. Can galvanized pipes be bent?

Yes, the pipe has excellent processing performance. Cold bending is recommended for best results.

3. Key Notes for Welding

Grind off the zinc coating within the welding area first. High welding temperature will generate harmful zinc fumes. After welding, repair the surface with anti-corrosion paint to restore rust resistance.

Why Choose Glory Steel?

1. Original Manufacturer: Self-produced hot/cold rolled steel coils & strips, slitting workshop matched with full ERW production lines. OEM & ODM customization available.
2. Complete Material Options: Customizable substrate grades, zinc coating thickness and wall thickness based on your project environment.
3. Stable Lead Time: Sufficient production capacity, mass orders can be scheduled for production promptly and delivered strictly on agreed schedule.
4. Factory Direct Price: Transparent cost and stable quality. Our multilingual sales team provides one-stop steel procurement solutions for global engineering contractors and steel distributors.

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. We specialize in manufacturing 1-inch, 2-inch, and 4-inch galvanized pipes, including round, square, and oval pipes. With our high-quality products and services, we export to over 120 countries.