Hot-Dip Galvanized Square Tubes are carbon steel tubes with a square cross-section, coated with a zinc layer through a hot-dip galvanizing process, ensuring superior corrosion resistance and durability. Compliant with ASTM A123 and A500 standards, these tubes are ideal for structural frameworks, fencing, and agricultural structures, offering a minimum tensile strength of 400 MPa and a zinc coating thickness of at least 1.5 oz/ft² (458 g/m²).

The manufacturing process involves forming steel strips into square tubes via electric resistance welding (ERW) or seamless methods, followed by immersion in molten zinc at approximately 450°C (842°F), creating a metallurgical bond that protects against rust. Available in sizes from 15x15 mm to 200x200 mm with wall thicknesses from 1.2 to 8.0 mm, and lengths from 6 to 12 meters, Hot-Dip Galvanized Square Tubes meet diverse project requirements. Surface treatments like passivation enhance longevity, and pre-cut or custom lengths facilitate easy installation.

These tubes undergo rigorous testing, including tensile, bending, and coating thickness tests, to ensure compliance with ASTM standards. The zinc coating acts as a sacrificial anode, protecting the steel even if scratched, making Corrosion-Resistant Square Tubes suitable for harsh environments like coastal and industrial settings. Their square shape provides enhanced structural stability for applications like scaffolding and piping supports.

Compared to non-galvanized square tubes or stainless steel tubes, Hot-Dip Galvanized Square Tubes offer superior corrosion protection and cost-effectiveness, though they may require periodic maintenance in highly corrosive environments. Their versatility and lifespan (up to 50 years) make them a preferred choice for greenhouse frames and structural applications.

Hot-Dip Galvanized Square Tubes address challenges like corrosion, environmental exposure, and structural integrity, delivering reliable, long-lasting solutions for industrial and agricultural applications.

Hot-dipped galvanized square tubing is an excellent candidate for most processing techniques. Welding, torching, or abrasive sawing galvanized steel is not recommended without proper protection and adequate ventilation. Galvanized square tubes are hot rolled steel, or mild steel, tubes that have dipped into a molten zinc coating process. Hot-dipped galvanize (HDG) can be identified by its crystallization pattern, also known as “spangle” on the surface of the material. Great corrosion resistance, excellent candidate for outdoor use or exposed environments. Common applications include structural support, outdoor signs, docks, trailers, sign posts and framing.

Available Sizes and Specifications
Size	OD	Wall Thickness	Length	Weight (Lb/Ft)
1-1/2" x 1-1/2" x 12ga	1-1/2 x 1-1/2"	12ga	288.00"	2.062
1-3/4" x 1-3/4" x 12ga	1-3/4 x 1-3/4"	12ga	288.00"	2.603
2" x 2" x 12ga	2 x 2"	12ga	288.00"	2.958

Galvanized Hydraulic Tube Advantages

4 Inch

galvanized square tubing

Buyers very like 4 inch square tubing. Making pre galvanized 4 inch square tubing by directly rolling galvanized coils into shape.

The surface of pre galvanized 4 inch square tubing is smoother and more attractive. Due to galvanizing, it also greatly increases the lifespan of steel pipes. so the pre galvanized 4 inch square tubing is used for many industries.

Tube Coating and Specification Details
Coating	Outer Diameter (inch)	W.T. (mm)	Length (M)	Zinc Layer	Standard	Grade
bare	4"×4"	0.5-16	0.5-26.5	No zinc coating	ASTM A500/A501, EN10219/10210, JIS G3466, GB/T6728/3094, AS1163, CSA G40.20/G40.21	Gr.A/B/C, S235/275/355/420/460, A36, SS400, Q195/235/355, STKR400/490, 300W/350W
galvanized square tubing	4"×4"	1-16	0.5-26.5	Ordinary galvanizing: usually between 45-500 micrometers (μ m)	ASTM A500/A501, EN10219/10210, JIS G3466, GB/T6728/3094, AS1163, CSA G40.20/G40.21	Gr.A/B/C, S235/275/355/420/460, A36, SS400, Q195/235/355, STKR400/490, 300W/350W

Properties of Hot-Dip Galvanized Square Tube

The properties of galvanized steel are a unique combination that make it ideal for use in interior and exterior applications such as car bodies, appliances, nuts and bolts, roofs, and rebar.

Corrosion Resistance
Surface Appearance
Formability
Durability
Recyclable

Hot-Dip Galvanized Square Tube Standard Specifications

Chemical Composition of Hot-Dip Galvanized Square Tube
Grade	C (% max)	Mn (% max)	P (% max)	S (% max)	Cu (% max)
Grade A	0.25	0.95	0.05	0.045	0.40
Grade B	0.30	1.20	0.05	0.045	0.40

The zinc coating (80-100 microns) enhances the corrosion resistance of Hot-Dip Galvanized Square Tube , protecting the carbon steel base in harsh environments. The chemical composition ensures weldability and durability for

Mechanical Properties of Hot-Dip Galvanized Square Tube
Grade	Tensile Strength (min, MPa)	Yield Strength (min, MPa)	Elongation (min, %)
Grade A	330	205	28
Grade B	415	240	30

These properties ensure Hot-Dip Galvanized Square Tube eliver robust performance in structural and high-pressure applications.

Comparison of Hot-Dip Galvanized Pipes with Other Pipes
Feature	Hot-Dip Galvanized Pipe	Pre-Galvanized Pipe	Stainless Steel Pipe
Coating	Zinc (80-100 microns)	Zinc (thinner, coil-coated)	None (inherent corrosion resistance)
Corrosion Resistance	Excellent (sacrificial anode)	Moderate (weaker at welds)	Superior (no coating needed)
Cost	Cost-effective	Lower initial cost	Higher cost
Lifespan	Up to 50 years	20-30 years	50+ years
Applications	Water, gas, construction	Light structural, fencing	Chemical, marine, hygienic

Hot-Dip Galvanized Pipes offer distinct advantages over pre-galvanized and stainless steel pipes.

Chemical Composition of Stainless Hollow Sections (Grades 304, 304L, 316, 316L per ASTM A554/A312)
Grade	C (% max)	Mn (% max)	Si (% max)	P (% max)	S (% max)	Cr (%)	Ni (%)	Mo (%)	N (% max)
304	0.08	2.00	1.00	0.045	0.030	18.0-20.0	8.0-11.0	-	0.10
304L	0.03	2.00	1.00	0.045	0.030	18.0-20.0	8.0-12.0	-	0.10
316	0.08	2.00	1.00	0.045	0.030	16.0-18.0	10.0-14.0	2.0-3.0	0.10
316L	0.03	2.00	1.00	0.045	0.030	16.0-18.0	10.0-14.0	2.0-3.0	0.10

The low carbon content in 304L and 316L enhances weldability, while molybdenum in 316 and 316L improves resistance to pitting and crevice corrosion, making Hot-Dip Galvanized Square Tube ideal for harsh environments.

Mechanical Properties of Stainless Hollow Sections (Grades 304, 304L, 316, 316L per ASTM A554/A312)
Grade	Tensile Strength (min, MPa)	Yield Strength (min, MPa)	Elongation (min, %)	Hardness (max, HB)	Hardness (max, HRB)
304	515	205	40	201	92
304L	485	170	40	201	92
316	515	205	40	217	95
316L	485	170	40	217	95

These mechanical properties make Hot-Dip Galvanized Square Tube suitable for applications requiring high strength and corrosion resistance, such as architectural structures, marine environments, and chemical processing.