S355 galvanized perforated square steel tube

hot dip galvanized coating on steel tube surface

perforated steel tube for solar mounting system

EN10219 S355 Hot Dip Galvanized Perforated Square Steel Tube for Solar Mounting Systems

Our S355 galvanized steel tube is a high-strength structural solution designed for solar mounting systems and photovoltaic structures. Manufactured from Q355/S355 carbon steel and produced according to EN10219 and GB/T 6728 standards, this galvanized square steel tube provides excellent load-bearing performance and long-term corrosion resistance for outdoor applications.

With a precision perforated design and hot dip galvanized surface treatment, this perforated galvanized square steel tube for solar mounting is widely used in ground-mounted solar projects, industrial PV systems, and other steel support structures requiring durability and installation efficiency.

Product Overview

S355 galvanized perforated square steel tube, also known as a galvanized hollow section, is a high-strength welded steel tube designed for solar mounting systems and structural applications. Made from S355/Q355 carbon steel, it offers excellent load-bearing performance, dimensional accuracy and long-term corrosion resistance. The hot dip galvanized surface provides reliable protection in outdoor environments, while the perforated design improves installation efficiency and reduces processing requirements. Available in various sizes, thicknesses and customized specifications, it is suitable for photovoltaic structures, construction frameworks and other engineering projects.

S355 galvanized perforated square steel tube for solar mounting systems

Product Specifications

Item	Details
Product Name	Galvanized Square and Rectangular Steel Tube with Holes
Material	Carbon Steel
Grade	Q355 / S355
Standard	EN10219, GB/T 6728
Surface	Hot Dip Galvanized
Zinc Coating	200-500g/m² (30-70μm)
Shape	Square / Rectangular
Size Range	60×60mm - 500×500mm
Thickness	3.0-10.0mm
Length	2-12m

Radius of Corners	≤3x Wall Thickness
Concavity and Convexity	Max.0.8%with a minimum of 0.5mm
Twist	2mm +Lx0.5/1000mm
Strightness	0.15%of total length and 3mm over any 1m length

Steel Grade S355 Chemical composition for product thickness≤30 mm
Standard	Steel grade	C(max.)%	Si(max.)%	Mn(max.)%	P(max.)%	S(max.)%	CEV (max.)%
EN10219	S355JOH	0.220.45	0.55	1.6	0.035	0.035
GB/T1591	Q355B	0.24	0.55	1.6	0.035	0.035	0.45

Steel Grade S355 Mechanical properties of non-alloy steel hollow sections in thicknesses≤40 mm
Standard	Steel grade	Minimum yield strength MPa		Tensile strength MPa		Minimum elongation %	Minimum impact energy J
		WT≤16mm	>16mm ≤40mm	<3mm	≥3mm ≤40mm	≤40mm	0℃	20℃
EN10219	S355JOH	355	345	510-680	470-630	20	27
GB/T1591	Q355B	355	345	470-630		20	-	27

Application Scenarios

Our galvanized perforated square steel tubes are widely used in:

1. Solar Mounting Systems
•Ground-mounted photovoltaic structures
•Solar panel support frames
•Agricultural solar projects
•Industrial PV installations

2. General Structural Applications
• Construction steel structures
• Building frameworks
• Fence posts
• Handrail systems

Why Choose Our Our S355 Galvanized Steel Tubes

✔ EN10219 standard production
✔ High-strength S355/Q355 material
✔ Durable hot dip galvanized coating
✔ Suitable for harsh outdoor environments
✔ Custom sizes and specifications available
✔ Professional export experience

Precision Cutting & Neat Weld Seam

Laser cutting technology delivers smooth and precise pipe ends, while straight seam welding ensures a clean and uniform weld appearance. Combined with a galvanized surface, the pipe offers better corrosion resistance, stable quality and easier fabrication.

Galvanized steel pipe dimensional inspection with caliper measurement for precise manufacturing quality control

Flexible Length Customization

Available in standard 6m and 12m lengths, our galvanized round pipes can also be customized according to project requirements. We support 20ft and 40ft standard shipping lengths, as well as special customized sizes to reduce cutting work and improve installation efficiency.

Uniform Zinc Coating Protection

Multiple galvanizing options, including hot dip, electric and pre-galvanizing, are available to meet different application needs. The uniform zinc coating improves corrosion resistance and durability, with inspection reports provided to ensure stable quality.

Hot dip galvanized steel pipe surface with uniform zinc coating for long-term corrosion resistance

FAQs

Q1: What standards do your galvanized steel tubes meet?

A1:Our products are manufactured according to EN10219 and GB/T 6728 standards, ensuring consistent structural performance.
Q2: Can you supply customized perforated steel tubes?

A2: Yes. As an EN10219 S355 steel tube supplier, we can customize dimensions, wall thickness, length, and perforation requirements.
Q3: How does hot dip galvanizing improve steel tube performance?

A3:Hot dip galvanizing creates a protective zinc coating that helps improve resistance against corrosion, moisture, and harsh outdoor conditions.
Q4: What is an S355 galvanized steel tube used for?

A4:An S355 galvanized steel tube is commonly used for solar mounting structures, construction frameworks, and outdoor steel applications requiring strength and corrosion resistance.

Manufacturing & Quality Assurance

1. Professional Steel Tube Production Support
With a 20,000㎡ production base and a professional technical team, we provide stable steel tube solutions for global customers.
Our experienced engineers focus on product optimization, quality consistency, and customized project requirements.

2. Efficient Export Service
Located only 45 km from the seaport, our factory provides convenient logistics solutions to support faster delivery and reliable international shipments.