High-Quality Black Square and Rectangular Tubes from China Suppliers | Yuantai Derun Factory Trusted for Over 20 Years
Uncompromising Strength & Versatility: Black Square and Rectangular Tube
We utilize only prime, traceable steel sourced from top-tier mills like HBIS and Baosteel. Our advanced production lines, including high-frequency welding (HFW) and electric resistance welding (ERW), ensure precise, consistent, and high-strength welds. The resulting Black Square and Rectangular Tube offers superior performance.
Key Material & Process Advantages
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High-Strength Options: Available in multiple grades to meet specific yield and tensile strength requirements.
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Superior Weld Integrity: Advanced welding techniques create seamless, durable joints that match the strength of the base material.
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Exceptional Dimensional Accuracy: Tight tolerances on outer dimensions (OD) and wall thickness guarantee fit-for-purpose performance and easier assembly.
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Excellent Uniformity: Consistent cross-section and wall thickness throughout the length ensure predictable behavior under stress.
Technical Parameters
Our Black Square and Rectangular Tube is produced to meet a wide array of international standards. The following table outlines our standard size range and common specifications, all of which can be customized.
| Parameter | Standard Range | Notes |
| Cross-Section Size | 10×10mm to 1000×1000mm | Custom intermediate sizes readily available. |
| Wall Thickness | 0.5mm to 60mm | Optimized for various structural and mechanical needs. |
| Length | Standard 6m or 12m, or Custom Cut | Cut-to-length services to minimize waste. |
| Common Steel Grades | ASTM A500 Gr. A/B/C, A36; EN S235JR, S275JR, S355JR; JIS SS400; GB/T 6728 Q235B, Q355B | Other grades like S420, S460, CSA 300W/350W available. |
| Surface Finish | Mill finish (uncoated black steel) | Ideal for painting, powder coating, or galvanizing post-fabrication. |
Your Vision, Precisely Formed: Customization Services
Beyond standard stock, we specialize in tailoring Black Square and Rectangular Tube to your exact project demands.
Full-Scale Customization Options:
- Grade & Chemistry: Select from an extensive portfolio of steel grades to meet specific mechanical properties, weldability, or environmental compliance (e.g., CE, JIS, ASTM certifications).
- Dimensional Precision: Specify exact outside dimensions, wall thickness, and length. We specialize in producing both large-scale structural tubes and precision tubes for machinery.
- Secondary Processing: Benefit from value-added services including precision cutting, drilling, end finishing, or pre-treatment for coating.
Quality Assured, From Mill to Site
Yuantai Derun integrates rigorous quality control at every stage. Our process includes:
Raw Material Inspection
Verification of mill test certificates (MTC) and in-house chemical analysis.
In-Process Checks
Automated monitoring for dimensional accuracy, straightness, and surface quality.
Final Verification
Comprehensive testing such as tensile strength, hardness, and non-destructive ultrasonic testing (UT) available upon request.
Certification
Products are backed by ISO 9001, CE (EN 10219), and other major international certifications.
Partner with Yuantai Derun for Black Square and Rectangular Tube that combines industrial strength with limitless potential. Request a quote or free sample today to validate our quality for your application.
Frequently Asked Questions
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What is the difference between black square tube and galvanized square tube?Black square tube features a mill finish (uncoated black steel surface), making it ideal for applications where the tube will be painted, powder-coated, or further treated after fabrication. Galvanized square tube has a zinc coating applied for enhanced corrosion resistance in outdoor or humid environments. Black tube is generally more cost-effective for indoor structural use.
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What steel grades are available for Black Square and Rectangular Tube?We offer a wide range of grades including ASTM A500 Gr. A/B/C, A36, EN S235JR, S275JR, S355JR, JIS SS400, GB/T 6728 Q235B and Q355B. Higher-strength grades such as S420, S460, and CSA 300W/350W are also available upon request to meet specific project requirements.
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Can you produce custom sizes outside the standard range?Yes. While our standard range covers cross-section sizes from 10×10mm to 1000×1000mm and wall thicknesses from 0.5mm to 60mm, we specialize in custom intermediate dimensions. We also offer cut-to-length services, allowing you to specify exact lengths to minimize material waste on your project.
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What quality certifications does Yuantai Derun hold?Yuantai Derun's Black Square and Rectangular Tube products are certified to ISO 9001 quality management standards and CE marking under EN 10219, along with other major international certifications. Mill test certificates (MTC) are provided with every order, and additional third-party inspection can be arranged upon request.
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What secondary processing services are available?Beyond standard tube supply, we offer a range of value-added services including precision cutting to length, drilling, end finishing, and surface pre-treatment for coating or painting. These services help reduce your on-site fabrication time and ensure components arrive ready for assembly.
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What welding process is used in manufacturing these tubes?Our Black Square and Rectangular Tubes are manufactured using advanced High-Frequency Welding (HFW) and Electric Resistance Welding (ERW) processes on state-of-the-art production lines. These methods produce precise, consistent, and high-strength welds that match the mechanical properties of the base material, ensuring structural reliability across all applications.