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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.
ERW (Electric Resistance Weld) Steel Pipe is a straight-seam welded pipe made by rolling steel strip into a circular shape, then heating the edges with high-frequency current and extruding to weld. It features uniform wall thickness, smooth surface, high strength and good weldability, which is an economical and practical pipe material.
erw black steel pipe also known as circular welded steel pipe, is a straight seam welded steel pipe made from hot-rolled or cold-rolled steel strips through continuous cold bending and high-frequency welding. It is currently the most produced and widely used economical pipe material.Widely used in structural support, fluid transportation, machinery manufacturing, construction, photovoltaics, guardrails, greenhouses, pipelines and other fields.
ASTM A501 Grade B ERW Structural Tubing
ASTM A501 is a standard for hot-formed shaped welded/seamless carbon structural steel pipes, divided into grades A, B, and C. It has good weldability, moderate cost, and is widely used in construction and general structures.
JIS G 3101 SS400 Carbon Steel Pipe
JIS G 3101 This Standard specifies the hot rolled steels and hot extruded sections used for general structure such as bridges, ships, rolling stocks and other structures (hereafter referred to as "steel product"). The core steel grades include SS330, SS400, SS490, and SS540, with product forms covering steel plates, steel strips, structural steel, and bars.
EN 10217-2 focuses on Electric welded non‑alloy and alloy steel tubes with specified elevated temperature properties, with P195GH/P235GH/P265GH/16Mo3 as the core steel grades. It meets different safety requirements through TC1/TC2 classification and is the core European standard for selecting high-temperature pipelines in power plants, chemical, and boiler industries. It complements EN 10216-2 (seamless steel pipes) and covers the high-temperature pressure requirements of welded processes.
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