Galvanized Seamless Tubes are carbon steel tubes manufactured without welds and coated with a zinc layer through hot-dip galvanizing, offering superior corrosion resistance and high strength. Compliant with ASTM A53 and A123 standards, these tubes are ideal for water supply systems, oil and gas pipelines, and structural frameworks, providing a minimum tensile strength of 415 MPa and a zinc coating thickness of at least 1.5 oz/ft² (458 g/m²).

The seamless manufacturing process involves hot-rolling or cold-drawing steel billets, followed by immersion in molten zinc at approximately 450°C (842°F), creating a metallurgical bond that protects against rust. Available in sizes from DN15 (1/2”) to DN200 (8”) with wall thicknesses from SCH 40 to SCH 160, and lengths from 5.8 to 12 meters, Galvanized Seamless Tubes meet diverse project requirements. Surface treatments like passivation enhance longevity, and plain or threaded ends ensure easy installation.

These tubes undergo rigorous testing, including tensile, hydrostatic, 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 Seamless Tubes suitable for harsh environments like marine and industrial settings. Their seamless construction ensures superior strength for high-pressure applications in oil and gas pipelines and industrial piping.

Compared to welded galvanized tubes or stainless steel tubes, Galvanized Seamless Tubes offer enhanced pressure resistance and durability, though they are more expensive than welded alternatives. Their versatility and lifespan (up to 50 years) make them a preferred choice for structural and high-pressure applications.

Galvanized Seamless Tubes address challenges like pipeline corrosion, high-pressure demands, and environmental exposure, delivering reliable, long-lasting solutions for industrial and residential applications.

EN 10305 Galvanized Hydraulic Seamless Steel Tube

Galvanized Hydraulic Tube

Galvanized hydraulic tube is a type of pipe commonly used for industrial applications. The interior of the tube, as well as its ends, are typically coated in zinc.

This zinc coating helps to prevent corrosion from occurring which can damage the tube. While many different types of tube exist, galvanized tube is one of the most common. The zinc coating on the interior of the tube is an important factor to take into consideration when choosing the right tube for your next application. Not all tubes are created equal and each one offers its own unique benefits and flaws.

If you’re not familiar with the types of tubes that are available, it can be difficult to know which one will be best suited for your application.

Why is Galvanized Tube Used?

Galvanized tube is used in many industrial applications due to its corrosion-resistant properties. Hydraulic systems are particularly susceptible to corrosion due to the presence of oil and other fluids. This corrosion can lead to serious system issues as well as breakdowns. Corrosion is a natural process that occurs when certain materials come into contact with one another. When a product is placed within a hydraulic system, it comes into contact with oil. If this oil is not kept clean, it can lead to corrosion. The presence of rust and corrosion in a hydraulic system can lead to serious problems. Rust can build up within the system and cause blockages. In more severe cases, it can lead to complete system failure.

Other Advantages of Galvanized Tubes

While corrosion resistance is the biggest advantage of using galvanized tubes, there are other benefits associated with this type of tube that should be considered as well. One of the most common reasons to use galvanized tubes is for the added strength that is offered. There are multiple different types of tubes that are available. Some of these offer more strength than others. If you’re designing a new system or replacing old components, it is important to consider the strength of each tube. If you’re designing a system that needs to be able to withstand a significant amount of pressure, you will want to choose a stronger tube. There are tubes that are designed to be stronger than others. If you’re looking for strength, it is important to consider stronger tubes.

Drawbacks of Using Galvanized Tubes

There are many different types of tubes available for hydraulic systems; however, not all tubes are created equal. Each tube has its own unique properties and features that make it suitable for certain applications over others. When picking out the right tube, it is important to consider the benefits and drawbacks of each type of tube to know which one is best suited for your application. While there are many different types of tubes, it is important to note that not all of them will be suitable for all applications. If you’re in need of a tube that can withstand a significant amount of pressure, galvanized tubes will not be suitable. If you are not careful, galvanized tubes can be susceptible to corrosion, which can lead to serious issues in your system. If you are in need of a tube that is corrosion-resistant, you will want to avoid galvanized tubes.

Conclusion

When it comes to choosing the right materials for your industrial applications, there are a number of different factors to take into consideration. Whether you’re designing new machinery or replacing old components, there are a number of details that must be evaluated when choosing the right materials. The type and quality of material can have a significant impact on how an application performs, as well as its overall longevity. When picking out the right materials, it is important to consider the benefits and drawbacks of each type of material. The best materials are those that are corrosion-resistant and able to withstand a significant amount of pressure without showing signs of weakness. When choosing materials for your next project, it is important to pick out the right type of tube to ensure your system performs as intended.

Tube Color

The color of galvanized tube is typically a dull gray or silver. This is due to the zinc coating that is applied to the interior of the tube.

Galvanized White Zinc Tube

Galvanized Yellow Zinc Tube

OD and Thickness Specifications (mm)
OD (mm)	1	1.5	2	2.5	3	3.5	4	4.5	5	6	8
OD (mm)	Thickness (mm)
6	6*1	6*1.5	6*2
8	8*1	8*1.5	8*2
10	10*1	10*1.5	10*2
12	12*1	12*1.5	12*2	12*2.5
14	14*1	14*1.5	14*2	14*2.5	14*3
15	15*1	15*1.5	15*2	15*2.5	15*3
16	16*1	16*1.5	16*2	16*2.5	16*3
18		18*1.5	18*2	18*2.5	18*3	18*3.5	18*4
20		20*1.5	20*2	20*2.5	20*3	20*3.5	20*4
22		22*1.5	22*2	22*2.5	22*3	22*3.5	22*4
25			25*2	25*2.5	25*3	25*3.5	25*4
28			28*2	28*2.5	28*3	28*3.5	28*4
30			30*2	30*2.5	30*3	30*3.5	30*4	30*4.5	30*5
32			32*2	32*2.5	32*3	32*3.5	32*4	32*4.5	32*5
34			34*2	34*2.5	34*3	34*3.5	34*4	34*4.5	34*5	34*6
35			35*2	35*2.5	35*3	35*3.5	35*4	35*4.5	35*5	35*6
38			38*2	38*2.5	38*3	38*3.5	38*4	38*4.5	38*5	38*6
40				40*2.5	40*3	40*3.5	40*4	40*4.5	40*5	40*6
42				42*2.5	42*3	42*3.5	42*4	42*4.5	42*5	42*6
45				45*2.5	45*3	45*3.5	45*4	45*4.5	45*5	45*6
46				46*2.5	46*3	46*3.5	46*4	46*4.5	46*5	46*6
48				48*2.5	48*3	48*3.5	48*4	48*4.5	48*5	48*6
50				50*2.5	50*3	50*3.5	50*4	50*4.5	50*5	50*6
54					54*3	54*3.5	54*4	54*4.5	54*5	54*6
60					60*3	60*3.5	60*4	60*4.5	60*5	60*6	60*8

Hot-Dip Galvanized Pipes offer distinct advantages over pre-galvanized and stainless steel pipes. Below is a comparison of key features.

Outer Diameter Tolerance Specifications
Outer Diameter	Allowable Tolerance		Special Tolerance
Outer Diameter	GB/T3639	DIN2391	OD	WT
4mm-20mm	±0.10mm	±0.08mm	±0.05mm	±0.05mm
20mm-30mm	±0.10mm	±0.08mm	±0.08mm	±0.08mm
31mm-40mm	±0.15mm	±0.15mm	±0.10mm	±0.08mm
41mm-60mm	±0.20mm	±0.20mm	±0.15mm	±0.15mm
61mm-80mm	±0.30mm	±0.30mm	±0.20mm	±0.20mm
81mm-120mm	±0.45mm	±0.45mm	±0.30mm	±0.30mm

Key Benefits

Corrosion Resistance

High chromium and molybdenum content for harsh environments.

Aesthetic Appeal

Polished or brushed finishes for decorative applications.

High Strength

Tensile strength up to 515 MPa for structural integrity.

Space Efficiency

Oval shape for tight spaces and better maneuverability.

Weldability

Easily welded for complex designs and installations.

Standards Compliance

Meets ASTM A554, A269, and A312 standards.

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Standards and Specifications

• Hot-Dip Galvanized Pipe specifications
• ASTM A123 galvanized steel pipes
• A53 corrosion-resistant galvanized pipes
• ISO 1461 zinc-coated steel pipes

Applications

• Galvanized pipes for water supply systems
• Hot-Dip Galvanized Pipes for construction
• Zinc-coated pipes for agricultural irrigation
• Durable galvanized tubing for gas pipelines

Material and Grades

• Hot-Dip Galvanized Pipe material properties
• A53 Grade B galvanized steel pipes
• Zinc-coated carbon steel pipes
• High-strength galvanized tubing grades

Manufacturing and Testing

• Hot-Dip Galvanized Pipe manufacturing process
• Galvanized pipe quality testing
• Zinc coating thickness standards
• Corrosion-resistant galvanized pipe quality

Note: Hot-Dip Galvanized Pipes meet international standards, ensuring high performance and reliability. Contact suppliers for detailed specifications.

Galvanized Seamless Tube Standard Specifications

Chemical Composition of Galvanized Seamless Tube
Grade	C (% max)	Si (% max)	Mn (%)	P (% max)	S (% max)
ST52 (DIN 2391)	0.22	0.55	1.60	0.025	0.015
E355 (EN 10305-1)	0.22	0.55	1.60	0.025	0.015
ASTM A519 1026	0.22–0.28	0.15–0.35	0.60–0.90	0.040	0.050

Mechanical Properties of Galvanized Seamless Tube
Grade	Tensile Strength (MPa min)	Yield Strength (MPa min)	Elongation (% min)
ST52 (DIN 2391)	600	520	14
E355 (EN 10305-1)	580	450	15
ASTM A519 1026	515	350	15

Comparison of Honed Tubes with Standard Tubes
Feature	Honed Tubes	Standard Tubes
Material Type	Carbon/Alloy Steel (ST52, E355)	Carbon Steel
Surface Finish	Ra ≤0.4 µm (Honed/SR-B)	Ra ≥1.0 µm
Tolerance	H7–H9	H11 or lower
Tensile Strength (MPa)	515–600	400–500
Applications	Hydraulic/Pneumatic Cylinders	General Piping
Cost	Higher (precision processing)	Lower
Key Advantage	Precision bore, extended seal life	Cost-effective for non-precision uses

H-Series Hole Tolerances (H7, H8, H9, H10) by Diameter Range (mm)
ID (mm)	TOLERANCE (mm)
ID (mm)	H7	H8	H9	H10
≦30	+0.021/0	+0.033/0	+0.052/0	+0.084/0
30 – ≦50	+0.025/0	+0.039/0	+0.062/0	+0.100/0
50 – ≦80	+0.030/0	+0.046/0	+0.074/0	+0.120/0
80 – ≦120	+0.035/0	+0.054/0	+0.087/0	+0.140/0
120 – ≦180	+0.040/0	+0.063/0	+0.100/0	+0.160/0
180 – ≦250	+0.046/0	+0.072/0	+0.115/0	+0.185/0
250 – ≦315	+0.052/0	+0.081/0	+0.130/0	+0.210/0
315 – ≦700	+0.057/0	+0.089/0	+0.140/0	+0.230/0

This will provide long piston seal life and prevent failure of the cylinder. The tube material is selected on the basis of application & working pressure.

The seamless tube for hydraulic cylinders, obtained from high quality cold drawn tubes, available in a wide dimensional range.

Length: unfixed length or fixed length
Package: banding with steel strips, braiding parcel at outside
Conservation: Anti rust oiled coating on the inside and outside of the surface, plastic caps at both ends.

Applications of Galvanized Seamless Tube

Galvanized seamless tubes are widely used in various industries, including construction, plumbing, automotive, and infrastructure projects.

Water supply systems
Gas pipelines
Agricultural machinery
Outdoor applications
Heavy truck
Construction machinery

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