4x4 Pre-Galvanized & Hot-Dip Galvanized Welded Steel Square Pipe (Q195, Q235B, ASTM A653) for Structural Construction
4x4 Pre-Galvanized & Hot-Dip Galvanized Welded Steel Square Pipe (Q195, Q235B, ASTM A653) for Structural Construction
4x4 Pre-Galvanized & Hot-Dip Galvanized Welded Steel Square Pipe (Q195, Q235B, ASTM A653) for Structural Construction
4x4 Pre-Galvanized & Hot-Dip Galvanized Welded Steel Square Pipe (Q195, Q235B, ASTM A653) for Structural Construction
Size: 20*20-500*500mm or as the requirement,
large size steel tube above 500*500 can be produced.
Thickness: 1.3-40mm or as the requirement
Length: 5.8m/6m/12m or as the requirement
1. All the pipes are high-frequency welded.
2. Both inner and outer welded stabs can be removed.
3. The pipe can be necked down and punched holes.
4. Supplying BV or SGS Inspection if the client needs it.
Description
Products Description
Products Specification
Hot-Dip Galvanized Square and Rectangular Tubes
Pre-Galvanized & Hot-Dip Galvanized Welded Square Steel Pipe (4x4 Inch) is a high-strength structural hollow section (SHS) manufactured from cold-rolled or hot-rolled carbon steel coils (Q195, Q235B, ASTM A653). Available in both pre-galvanized (zinc coating 40–120 g/m²) and hot-dip galvanized finishes (zinc coating up to 300–600 g/m²), it offers superior corrosion resistance, structural integrity, and weldability for indoor and outdoor construction applications.
Manufacturing Process
The manufacturing process of hot-dip galvanized square and rectangular tubes begins with the creation of the tube from steel coils. The coils are first formed into tubes by cold rolling or hot rolling processes and then cut to the desired length. The tubes are then cleaned to remove any impurities, which is crucial for a strong bond between the steel and the zinc coating.
Next, the tubes are submerged into a bath of molten zinc. The temperature of the zinc bath is critical, typically maintained between 450°C and 480°C. The immersion time and the temperature determine the thickness of the zinc coating. Once coated, the tubes are cooled and then passivated to prevent white rust formation.
| Parameter | Pre-Galvanized Square Pipe | Hot-Dip Galvanized (HDG) Square Pipe |
| Outer Dimension | 4" x 4" (100mm x 100mm) | 4" x 4" (100mm x 100mm) |
| Steel Grade | Q195, Q235,etc | Q195, Q235B,etc |
| Manufacturing Process | Electric Resistance Welded (ERW) | Electric Resistance Welded (ERW) + Post-Galvanizing |
| Surface Finish | Smooth, bright silver finish | Matte, thick spangle / silver-gray |
| Wall Thickness | 1.2mm – 4.0mm (customizable) | 1.5mm – 8.0mm (customizable) |
| Primary Application | Indoor framing, scaffolding, fencing | Heavy outdoor structural engineering, solar racks |
Properties
Hot-dip galvanized square and rectangular tubes possess several desirable properties that make them suitable for various applications. These include:
Corrosion Resistance: The zinc coating offers excellent protection against corrosion, making the tubes ideal for outdoor use and in environments where rusting is a concern.
Durability: The zinc coating can last for decades without maintenance, depending on the thickness of the coating and the environment.
Flexibility: These tubes can be bent, cut, and welded without compromising the integrity of the zinc coating.
Aesthetic Appeal: The smooth, shiny finish of the zinc coating adds a visually appealing aspect to constructions and designs.
Key Features & Applications
Key Structural Advantages:
High Yield Strength & Stability: Formed via ERW welding with strict dimensional tolerances, ensuring reliable load-bearing capacity for building frames.
Dual Galvanizing Options: Choose Pre-Galvanized for smooth surface finish and cost-effective indoor usage, or Hot-Dip Galvanized for long-term anti-rust protection in exposed environments.
Standard Compliance: Produced according to GB/T 6728, ASTM A500, or EN 10219 standards to match international structural engineering specs.
Typical Construction Applications:
Structural building frameworks and roof trusses
Outdoor fencing, handrails, and highway guardrails
Solar panel mounting structure brackets
Scaffolding systems and greenhouse support posts
Company Profile
Tianjin Yuantai Derun Steel Pipe Manufacturing Group Co., Ltd. is ranked among China's Top 500 Manufacturing Enterprises and Top 500 Private Enterprises. Headquartered in Tianjin, the Group operates major manufacturing bases in Tianjin Daqiuzhuang Industrial Park and Tangshan Luanzhou Equipment Manufacturing Industrial Park.
Yuantai Derun is the world's largest, most advanced, and most specialized manufacturer of square and rectangular structural hollow sections (SHS/RHS). With an annual production capacity of 10 million tons, its square and rectangular tube capacity reaches 6 million tons, ranking No. 1 globally.
Product Portfolio & Dimensional Range:
Square & Rectangular Hollow Sections (SHS/RHS): 20×20×1.0mm to 1200×1500×50mm (Global Market Leader)
Welded Carbon Steel Pipes: ERW welded circular pipes, LSAW (Longitudinal Submerged Arc Welded) pipes, and SSAW spiral pipes
Coated Structural Tubing: Hot-dip galvanized pipes and Zinc-Aluminum-Magnesium (ZAM/ZMA) coated steel products
Adhering to international structural standards (ASTM A500, EN 10219, EN 10210, GB/T 6728), Yuantai Derun serves global structural engineering, solar panel mounting structures, infrastructure, and heavy equipment manufacturing.
Production line
Tianjin Yuantai Derun Steel Pipe Manufacturing Group Co., Ltd. is ranked among China's Top 500 Manufacturing Enterprises and Top 500 Private Enterprises. Headquartered in Tianjin, the Group operates major manufacturing bases in Tianjin Daqiuzhuang Industrial Park and Tangshan Luanzhou Equipment Manufacturing Industrial Park.
Yuantai Derun is the world's largest, most advanced, and most specialized manufacturer of square and rectangular structural hollow sections (SHS/RHS). With an annual production capacity of 10 million tons, its square and rectangular tube capacity reaches 6 million tons, ranking No. 1 globally.
Product Portfolio & Dimensional Range:
Square & Rectangular Hollow Sections (SHS/RHS): 20×20×1.0mm to 1200×1500×50mm (Global Market Leader)
Welded Carbon Steel Pipes: ERW welded circular pipes, LSAW (Longitudinal Submerged Arc Welded) pipes, and SSAW spiral pipes
Coated Structural Tubing: Hot-dip galvanized pipes and Zinc-Aluminum-Magnesium (ZAM/ZMA) coated steel products
Adhering to international structural standards (ASTM A500, EN 10219, EN 10210, GB/T 6728), Yuantai Derun serves global structural engineering, solar panel mounting structures, infrastructure, and heavy equipment manufacturing.
Certification
Quality Qualifications & Global Compliance
Tianjin Yuantai Derun Group enforces rigorous quality control across all manufacturing facilities. We are fully certified under ISO 9001 (Quality), ISO 14001 (Environmental), and ISO 45001 (Health & Safety) management systems.
Our structural hollow sections and steel pipes comply with global standards such as EN 10210, EN 10219, and JIS G3466, and hold prestige approvals from major classification societies including DNV, BV, ABS, and KR.
ISO Systems: ISO 9001, ISO 14001, ISO 45001
Classification Societies: DNV, Bureau Veritas (BV), ABS, Korean Register (KR)
Technical Standards: EN 10210, EN 10219, JIS G3466
Need additional certification reports or project-specific test certificates?
We support specialized third-party inspections and client-requested standard testing.
👉 [Click Here to Request Full Certificate Catalog ]
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