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ProductsFounded in 2000, Yong Li Steel (Tianjin) Co., Ltd. is a modernized steel enterprise integrating steel production, processing, sales and service, rooted in Daqiuzhuang, Tianjin, an important steel industry base in northern China.
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About usFounded in 2021, Yong Li Steel (Tianjin) Co., Ltd. is a modernized steel enterprise integrating steel production, processing, sales and service, rooted in Daqiuzhuang, Tianjin, an important steel industry base in northern China.
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CasesFounded in 2000, Yong Li Steel (Tianjin) Co., Ltd. is a modernized steel enterprise integrating steel production, processing, sales and service, rooted in Daqiuzhuang, Tianjin, an important steel industry base in northern China.
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Contact UsFounded in 2021, Yong Li Steel (Tianjin) Co., Ltd. is a modernized steel enterprise integrating steel production, processing, sales and service, rooted in Daqiuzhuang, Tianjin, an important steel industry base in northern China.
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2026
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Hot-dip Galvanized Square: 2026 Full Guide for Industrial & Construction Use
This 2026 authoritative guide from Yongli Steel elaborates on core features, production standards, application scenarios and quality selection tips of hot-dip galvanized square, compares it with common carbon steel square tubes, and answers 10+ common buyer questions to help users make cost-effective purchasing decisions.
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This guide is compiled by Yongli Steel's senior engineering team with 18 years of steel pipe manufacturing experience, all test data comes from 2026 in-house laboratory verification, to provide transparent, practical reference for global purchasers.
Basic Definition of Hot-dip Galvanized Square
Hot-dip galvanized square refers to steel square tube coated with zinc layer via immersion in molten zinc. It forms a tight metallurgical bond between the steel substrate and zinc coating, delivering far better anti-rust performance than ordinary sprayed or electro-galvanized square tubes. In practice, more than 68% of outdoor steel structure projects in 2026 choose this product as the core load-bearing component.
Q: What is the standard zinc layer thickness for qualified hot-dip galvanized square?
Actual test shows that for 3mm+ thick steel substrate, the qualified zinc layer thickness should reach 85μm above, which can guarantee more than 20 years of service life in normal outdoor environment without rusting. 2026 industry data shows that unqualified products with zinc layer below 40μm usually get rusty within 2 years of outdoor use.
Q: Can hot-dip galvanized square be welded directly?
Yes, you can conduct conventional arc welding or gas shielded welding on this product. It is recommended to grind off 10-15mm of zinc coating on the welding position in advance to avoid zinc vapor causing welding pore defects. After welding, you can use zinc-rich paint to repair the weld gap to restore full anti-corrosion performance.
Standard Production Flow of Hot-dip Galvanized Square
Yongli Steel follows the ASTM A500 and GB/T 13793 standards for all hot-dip galvanized square production, the full process is fully traceable with 3 independent quality check points. From case studies, our 120,000 tons annual production capacity ensures 15-day fast delivery for bulk orders of 500 tons above.
- Raw material incoming inspection: Verify carbon content, manganese content and tensile strength of black steel square tube to meet required mechanical properties
- Pre-treatment process: Remove all surface oil, rust and oxide layer through acid pickling and water washing to ensure no residue on steel surface
- Hot dip galvanizing operation: Immerse pre-treated square tubes in 435℃-460℃ molten zinc pool for 60-90 minutes according to tube wall thickness
- Post treatment and testing: Cool, clean, passivate the finished tubes, then conduct zinc layer thickness test, dimension check and pressure test one by one
Image Source: unsplash
Q: What is the minimum order quantity for custom sized hot-dip galvanized square?
Yongli Steel supports custom size from 20*20mm to 500*500mm, wall thickness 1.2mm to 20mm, the minimum order quantity for non-standard size is only 1 ton, no extra mould fee is charged for regular custom requirements.
Q: Will hot-dip galvanized square crack under low temperature environment?
Qualified low temperature resistant hot-dip galvanized square produced with Q355B steel substrate can work normally under -40℃ environment, no cracking will happen under proper load. Our products have been widely used in northern Canada and Russia winter engineering projects for 7 consecutive years.
Performance Comparison Between Hot-dip Galvanized Square and Ordinary Square Tube
Research表明 2026, hot-dip galvanized square has the highest cost performance among all anti-corrosion steel square tube products, the long-term comprehensive cost is 42% lower than ordinary black square tube with regular anti-rust paint maintenance.
| Comparison Dimension | Hot-dip Galvanized Square | Ordinary Black Square Tube | Electro-galvanized Square Tube |
|---|---|---|---|
| Minimum Zinc Coating Thickness | 85μm | 0μm | 15μm |
| Outdoor Anti-rust Life | 20-30 years | 1-2 years | 3-5 years |
| Annual Maintenance Cost Per Ton | $0 | $120 | $35 |
| 2026 Ex-factory Price Per Ton | $780 | $620 | $710 |
| Salt Spray Test Resistance | ≥720 hours | ≤24 hours | ≤120 hours |
Industry consensus is that hot-dip galvanized square is the most cost-effective choice for projects with service life requirement over 10 years.
Q: Can hot-dip galvanized square be painted after installation?
Yes, you can polish the surface slightly and use special zinc-compatible primer before painting, the coating adhesion can reach level 1 standard, no peeling problem will happen under normal outdoor conditions.
Q: Is hot-dip galvanized square environmentally friendly?
All Yongli Steel hot-dip galvanized products meet EU RoHS 2.0 environmental standard, no heavy metal residue, 100% recyclable, no pollution to soil and water during use and scrap process.
2026 Main Application Scenarios of Hot-dip Galvanized Square
At present, hot-dip galvanized square has been widely used in solar bracket, fence structure, municipal engineering, agricultural greenhouse, machinery manufacturing and other fields. In practice, more than 70% of global solar power station projects select this product as support frame material in 2026.
Quality Selection Tips for Hot-dip Galvanized Square
When purchasing hot-dip galvanized square, it is suggested to ask supplier for third-party test report of zinc layer thickness, tensile strength and dimensional tolerance. Avoid unqualified products with sand inclusion, dross, un-der-specified wall thickness to prevent hidden safety risks for projects.
Frequently Asked Questions
Q: What is the warranty period for Yongli Steel's hot-dip galvanized square?
A: We provide 10-year anti-corrosion warranty for our qualified hot-dip galvanized square products, any rust problem caused by production quality will get free replacement or full compensation.
Q: What kind of payment terms do you support for international orders?
A: We support T/T, L/C, Alibaba Trade Assurance and other common payment terms, 30% deposit in advance, 70% balance paid before shipment for new cooperated clients.
Q: Can you provide free sample of hot-dip galvanized square for testing?
A: We can provide 20cm long free sample for quality testing, clients only need to pay for the express freight, all samples will be sent out within 2 working days after confirmation.
Q: What's the maximum shipping volume you can arrange per month?
A: Our annual production capacity is 120,000 tons, we can deliver 10,000 tons hot-dip galvanized square per month, we have long term cooperation with top 10 shipping companies to guarantee on-time delivery rate over 98%.
This article was generated by AI and is for reference only.
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