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Black square tube is a kind of cold-formed or hot-rolled carbon steel hollow section with black oxide surface, featuring low cost, good weldability and excellent structural stability. It is widely used in building structure, engineering framework, mechanical manufacturing, fence and container processing.
RECTANGULAR TUBE FOR CONSTRUCTION
Structural square tubes (SHS) and rectangular tubes (RHS), commonly known as hollow structural sections (HSS), are essential carbon steel hollow profiles for modern construction engineering. With uniform wall thickness, excellent torsional resistance, neat appearance, reliable weldability and high structural rigidity, they are widely applied in building frames, support structures, exterior decoration and civil engineering projects.
Black Mild Steel Pipe, also known as black carbon steel pipe, is a non-galvanized low-carbon steel pipe. Featuring a natural black oxide layer on the surface, this pipe boasts stable mechanical performance and excellent processability. It is an economical and versatile steel pipe widely applied in global construction and industrial fields.
EN 10210 S355J0H hot finished square steel tubes with complete certification and abundant stock. Manufactured in compliance with the European standard for hot-finished structural hollow sections, these square tubes adopt normalized fine-grain steel, featuring stable mechanical performance and high structural reliability, which are widely recognized in global structural engineering fields.
EN 10219 S355J0H SQUARE STEEL TUBE
EN 10219 S355J0H square hollow sections are cold-formed welded structural hollow sections of non-alloy and fine grain steels, strictly manufactured in accordance with the EN 10219 standard, ensuring excellent performance and reliable quality for various structural applications.
EN 10210 S355J2H steel tube is a premium hot-finished structural hollow section made of fine-grain steel, where the letter "J2" denotes the quality grade (impact test at -20℃) and "H" indicates hollow section. It is produced by hot-finishing process, which ensures excellent structural stability and mechanical properties. This grade is widely recognized for its reliable toughness, good weldability, and dimensional accuracy, making it suitable for various medium-load structural applications in harsh environments, especially low-temperature scenarios.
EN 10210 S355NH (material number: 1.0539) steel tubes, which are hot-finished structural hollow sections made of normalized fine-grain steel. Our products cover both seamless (SMLS) and welded (ERW) types, fully complying with EN 10210-1:2006 standard. All steel tubes are accompanied by mill test certificates (EN 10204-3.1) and CE certification, ensuring traceability and reliability for your projects.
STKR 490 carbon steel tube is a high-strength structural steel pipe produced in strict accordance with the Japanese Industrial Standard JIS G3466, mainly used in scenarios requiring high load-bearing capacity and structural stability. It is available in square (SHS) and rectangular (RHS) hollow sections, with mature production processes and stable product performance, serving a wide range of industrial and construction fields.
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