China Loong Carbon Steel Co., Ltd. manufactures square hollow carbon steel tubes engineered for structural frames, machinery housings, automotive components, and general industrial use. The tubes are produced from high-quality carbon steel with controlled carbon content to balance strength and ductility, enabling reliable performance under demanding conditions. Our advanced extrusion/welding processes ensure uniform wall thickness and precise outer dimensions, while tight tolerances minimize assembly gaps and facilitate automated manufacturing. The product line supports extensive OEM/ODM flexibility: customers can specify outer size, wall thickness, length, bend allowances, and surface finishes. Available options include mill finish, galvanization, and ready-to-paint surfaces, with optional coating and packaging choices to suit different supply chains. Each order can be engineered for compatibility with standard fasteners and joining methods, simplifying integration into frames, enclosures, racks, and structural systems. In addition, we offer custom cutting, end-finishing, and marking to aid traceability and assembly. Quality is a core focus of China Loong Carbon Steel Co., Ltd. The brand is known for consistent manufacturing quality, process discipline, and a reputation for dependable supply for global OEM/ODM collaborations. Our production facilities implement rigorous inline inspections and final quality checks to ensure dimensional accuracy, surface integrity, and defect-free materials. With scalable capacity and robust quality management, we can support small pilot runs or large-volume shipments while maintaining lead times and batch traceability. The result is a versatile tubing solution that meets international market requirements and supports diverse applications across industries.