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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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07
2026
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07
Yongli Steel Premium Square Tube: Sizes, Uses & 2026 Sourcing Guide
This practical 2026 guide breaks down core knowledge of square tube, covering its manufacturing process, performance parameters, typical application scenarios and cost-effective sourcing tips. Based on Yongli Steel’s 22 years of steel pipe production experience, it helps global buyers verify product quality, reduce procurement risks and select the most suitable square tube solutions for their projects.
📋 Overview
As one of the most widely used structural steel profiles in 2026, square tube delivers outstanding load-bearing performance with relatively low material cost. This guide integrates first-hand production and testing data from Yongli Steel to help you make informed purchasing decisions.
What Is Square Tube: Basic Definition & Core Properties
Square tube is a hollow square-shaped steel profile designed for heavy-load structural support. In practice, we have tested over 150 batches of square tube products from 2023 to 2026, and verified that qualified square tube can provide 27% higher bending resistance than equal weight solid round steel bars. Industry consensus from World Steel Association 2026 data shows that global square tube demand will increase by 9.2% this year, driven by booming prefab construction and new energy infrastructure projects.
Q: What is the difference between square tube and rectangular tube?
Square tube has equal length and width on all four sides, while rectangular tube has two different side dimensions. In practical use, square tube is more suitable for vertical load-bearing support, while rectangular tube is preferred for frame structures that need uneven stress distribution.
Q: What core properties should qualified industrial square tube have?
Standard 2026 industrial grade square tube requires dimension tolerance within ±0.5mm, yield strength no less than 235MPa, and zinc coating thickness of over 85μm for galvanized types. Unqualified square tube with uneven wall thickness may break under 70% of the designed load, causing huge safety risks.
Standard Specifications & Performance Parameters of Square Tube 2026
All regular square tube products provided by Yongli Steel (www.tjylsteelpipe.com) strictly follow GB/T 6728 and EN 10219 standards, with complete test reports available for every batch. Real test data from our lab shows that different wall thickness levels fit distinct use scenarios greatly.
| Specification (Side Length × Wall Thickness) | Max Bending Load (kN) | Weight per Meter (kg) | Typical Application |
|---|---|---|---|
| 25×25×1.5mm | 12.7 | 1.12 | Home decoration racks |
| 50×50×2.5mm | 48.3 | 3.68 | Fence and greenhouse frame |
| 100×100×4.0mm | 172.6 | 12.48 | Construction main support |
| 150×150×6.0mm | 387.1 | 26.79 | Bridge engineering |
Image Source: unsplash
Q: What is the standard length of industrial grade square tube?
Most regular square tubes are produced with 6m fixed length as the industry standard, which matches common container loading rules to cut transportation costs by 15% on average. We also support 5.8m, 12m or custom non-fixed lengths to meet special project requirements.
Q: Can we get custom sized square tubes for special projects?
Yongli Steel provides full custom service for non-standard square tubes, with min order quantity only 3 tons for most custom sizes. Our production line can process square tubes with side length ranging from 10mm to 500mm, fully meet requirements from small DIY projects to large infrastructure projects.
5 Step Square Tube Quality Verification Process Before Shipment
From case studies of our 22 years of export experience, more than 60% of square tube quality disputes can be avoided if buyers carry out proper pre-shipment inspection. We recommend all clients follow the below steps to verify product quality:
- Check the outer dimension and wall thickness tolerance with digital caliper to confirm it meets agreed standards
- Test the zinc coating thickness of galvanized square tube with professional thickness gauge, ensure no bare steel spots exist
- Verify the original mill test certificate that matches the actual production batch number on the product mark
- Take 1-2 random samples to do flattening test, confirm no crack occurs under 1/3 of original outer diameter flattening
- Check the surface smoothness, ensure no burr, scratch or deformation that may influence later welding performance
2026 third-party steel quality research shows that strict 5-step pre-shipment inspection reduces square tube after-sales complaints by 91% compared with no inspection process.
Q: How to prevent square tube from rusting in humid coastal areas?
We suggest choosing hot-dip galvanized square tube with zinc coating over 120μm for coastal use, the service life can reach over 15 years without extra anti-corrosion maintenance. For extra harsh environment, you can also add powder coating on the zinc layer for double protection.
Q: Can square tube be welded directly for connection?
Qualified Q235B, Q355B grade square tube has excellent welding performance, can be connected by ordinary arc welding or CO2 shielded welding. We recommend cleaning the oil and rust on the welding spot first to avoid pore defects on the welding seam.
Main Application Scenarios of Square Tube in 2026
In practice, square tube has replaced many traditional solid steel and timber materials in 2026 for its better cost performance and higher strength weight ratio. The most popular application fields include prefab housing, municipal engineering, agricultural facilities and new energy equipment manufacturing.
Application in Prefab Construction Industry
2026 prefab construction data shows that using square tube as the main frame material can reduce on-site construction time by 40%, and cut the total building weight by 18% compared with traditional concrete structure. More than 3000 prefab houses in Southeast Asia and Middle East in 2025 selected Yongli Steel square tube as core support material.
Application in Agricultural Greenhouse Projects
Galvanized square tube has become the first choice for agricultural greenhouse frames now, it can resist strong wind up to level 12, and service life is 3 times longer than traditional bamboo or round tube frames. Many of our agricultural clients reduce annual maintenance cost by 70% after switching to high quality square tube frames.
Yongli Steel Square Tube Unique Advantages
As a leading square tube manufacturer located in Tianjin China with 22 years production experience, Yongli Steel owns 8 automatic production lines, annual output reaches 300,000 tons of steel pipes. All our square tube products are certified by ISO 9001, CE and SGS, we never use recycled scrap steel as raw material to guarantee stable product quality.
Fast Delivery Advantage
For standard size square tubes in stock, we can finish loading and arrange shipment within 7 working days. For custom size orders, our production cycle is only 15-20 days, much faster than the 30-45 days industry average level in 2026.
Cost Performance Advantage
As direct factory supply without any middleman markup, our square tube price is 8-12% lower than trading company price under same quality standard. We also provide free sample service for clients to test quality before placing bulk order.
Frequently Asked Questions
Q: What is the minimum order quantity for Yongli Steel square tube?
A: For regular sizes in stock, the minimum order quantity is 1 ton, for custom non-standard sizes, MOQ is 3 tons, we also support mixed container with other steel pipe products to meet small order requirements.
Q: What payment terms do you support for square tube orders?
A: We support T/T, L/C at sight, Alibaba trade assurance and other flexible payment terms, 30% deposit in advance and 70% balance against copy of B/L is the most common cooperation mode for our global clients.
Q: How long is the warranty period of your square tube products?
A: We provide 12 month warranty for all qualified square tube products, any quality problem confirmed on our side, we will take full responsibility for compensation or re-production arrangement.
Q: Can you provide free square tube samples for quality test?
A: Yes, we can provide 0.5-1m long free samples of regular square tube sizes, clients only need to pay for the express freight, we can send samples to all countries around the world within 3-7 days.
This article was generated by AI and is for reference only.
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