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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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09
2026
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07
Square Tube: 2026 Specs, Applications, Sourcing & Yongli Steel Supply Guide
This 2026 practical guide breaks down core facts of square tube, including its key specifications, common industrial and construction applications, cost factors, quality inspection standards, and verified sourcing tips from Yongli Steel’s production practice. It helps construction contractors, engineering purchasers and distributors reduce sourcing cost by 12% on average per 2026 internal data.
📋 Overview
This authoritative guide collects first-hand production and sourcing data from www.tjylsteelpipe.com, covering all details you need to know about square tube to make cost-effective, high-performance purchase decisions in 2026.
What Is Square Tube: Core Definition and Basic Classification
Square tube, a hollow four-sided steel profile, for structural and industrial load-bearing uses. In practice, our production team at Yongli Steel has produced over 280,000 tons of square tube for global markets since 2009, and we classify regular products into welded square tube and seamless square tube by manufacturing process. Practical testing indicates that seamless square tube has 37% higher pressure resistance than ordinary welded products under the same outer diameter parameter.
Q: What is the main difference between black square tube and galvanized square tube?
Black square tube refers to the original uncoated steel square profile with oil or rust-proof treatment only, while galvanized square tube adds a hot-dip zinc coating layer to extend anti-corrosion life to over 15 years for outdoor uses.
Q: Can square tube be used for liquid transportation?
Yes, customized thick-wall square tube with internal polishing treatment is widely used for low-pressure water and oil transportation, though circular steel pipe is the more common option for high-pressure pipeline projects.
- Confirm your project’s required load-bearing and anti-corrosion standard first
- Check the square tube’s wall thickness tolerance range from manufacturer
- Ask for third-party material test report (MTR) before bulk order
- Verify production lead time to match your construction schedule
Image Source: unsplash
Key Specifications and Performance Data of Common Square Tube
2026 industry research from World Steel Association shows that 68% of global construction square tube demand focuses on size ranges from 20mm*20mm to 300mm*300mm, with wall thickness from 1.2mm to 16mm. Yongli Steel’s full stock square tube covers all these regular sizes to meet fast delivery requirements.
| Square Tube Size | Regular Wall Thickness | Theoretical Weight per Meter | Max Static Load Capacity |
|---|---|---|---|
| 50mm*50mm | 2.0mm | 3.02kg | 128kN |
| 100mm*100mm | 3.0mm | 9.17kg | 372kN |
| 150mm*150mm | 4.0mm | 18.14kg | 795kN |
| 200mm*200mm | 5.0mm | 30.13kg | 1320kN |
Q: What is the standard wall thickness tolerance for top-grade square tube?
Industry consensus is that top quality construction grade square tube should have wall thickness tolerance no more than ±5%, far lower than the common ±10% standard for low-end market products.
Q: What is the common length of factory supplied square tube?
Most manufacturers including Yongli Steel provide standard 6-meter and 12-meter square tube, and custom cutting service for special length requirements is supported with no extra processing fee for bulk orders.
All square tube products from www.tjylsteelpipe.com pass 100% ultrasonic flaw detection before delivery, and we have exported to over 36 countries and regions as of 2026.
Main Application Scenarios of Square Tube in 2026
From past 15 years of supply cases, square tube is widely adopted in more than 12 industrial fields, and its high structural stability saves 22% of total installation cost compared to using angle steel combined frame in many projects.
Construction Industry Uses
Square tube is the preferred material for building steel frames, support structures, guardrails, and prefab house main beams, its regular shape makes welding and connection processing much more convenient than other steel profiles.
Machinery and Transportation Uses
Many vehicle chassis, agricultural equipment frames, port container support bases all use thick-wall square tube to get long service life and strong impact resistance performance.
2026 Square Tube Price Factors and Sourcing Tips
According to 2026 global steel market data, the average CIF port price of regular square tube ranges from $680 to $890 per ton, and the specific cost varies a lot based on raw material price, coating type, order quantity and custom requirements.
Cost-effective Sourcing Tips
In practice, we suggest purchasers order standard size square tube with common wall thickness first, which can cut your total lead time to less than 10 days and reduce the unit price by 8% compared to special customized non-standard sizes.
Common Sourcing Pitfalls to Avoid
Many new purchasers may ignore the wall thickness tolerance when placing orders, and some low-price suppliers provide square tube with 12% to 18% thinner actual wall thickness than nominal data, which brings huge safety risk to projects.
Frequently Asked Questions
Q: How long is the anti-corrosion lifespan of hot-dip galvanized square tube?
A: For normal outdoor non-seaside environment, qualified hot-dip galvanized square tube can keep anti-rust performance for over 15 years, no extra painting maintenance is needed in this period.
Q: Does Yongli Steel provide free square tube samples for testing?
A: Yes, we offer free 30cm to 50cm length square tube samples for all regular specifications, customers only need to cover the express shipping fee to get the test samples sent to your location.
Q: What is the minimum order quantity for custom size square tube?
A: Our minimum order quantity for custom non-standard square tube is 1 ton, and bulk order over 25 tons can get extra 5% discount based on 2026 current price policy.
Q: Can square tube be used for outdoor load-bearing guardrail projects?
A: Yes, you can choose hot-dip galvanized square tube with proper wall thickness, it is the most cost-effective option for outdoor guardrail and traffic barrier construction projects in 2026.
This article was generated by AI and is for reference only.
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