Cangzhou Avant International Trade Co., Ltd. is one of the leading manufacturers and suppliers of hot-rolled square and rectangular steel tube in China. We are committed to providing high quality customized products with competitive price. Welcome to wholesale cheap hot-rolled square and rectangular steel tube in stock here from our factory. Also, free sample is available.
The production logic of LSAW fundamentally determines its high-performance attributes. It uses single, wide, thick steel plates as raw materials, rather than steel strip coils. The mainstream processes employ JCO forming (step-by-step bending) or UOE forming (stamping expansion forming) to cold-press the steel plate into a pipe blank, followed by simultaneous submerged arc welding on both the inner and outer sides of the pipe. This "double-sided submerged arc welding" process utilizes the arc heat beneath the flux layer to achieve deep penetration, resulting in extremely dense weld metal. More importantly, post-weld mechanical expansion of the entire pipe is essential. This step aims to eliminate residual welding stress and significantly improve the dimensional accuracy and fatigue resistance of the pipe.
Hot-rolled square and rectangular steel tubes are mainly divided into two categories: hot-rolled seamless square and rectangular tubes and hot-rolled formed welded square and rectangular tubes, commonly abbreviated in the industry for both domestic and international trade as SHS (square hollow profile) and RHS (rectangular hollow profile). Compared to cold-formed tubes, they have a higher forming temperature, resulting in a more uniform internal grain structure and effectively avoiding the residual internal stress problems caused by cold working. This is crucial, as it significantly reduces the risk of pipe cracking and deformation under extreme working conditions, making it perfectly suited for demanding applications such as outdoor infrastructure, heavy machinery supports, marine engineering, and large factory steel structures.
Comprehensive material compatibility is a key reason for its global market success. Our mainstream exported materials cover two major series: carbon steel and low-alloy high-strength steel, including commonly used domestic grades such as Q235B, 20#, and Q355B/C/D. They are also fully compatible with internationally recognized standards, such as European S235JR and S355JR, American ASTM A500 Gr.B/C, and Japanese SS400 and STKR490, meeting the engineering acceptance standards of different countries and regions and adapting to the procurement needs of Europe, America, Southeast Asia, the Middle East, Africa, and other parts of the world.
Quality is the cornerstone of international trade. We implement end-to-end quality control, from incoming raw material inspection to online dimensional monitoring during rolling, and finally to hydrostatic testing and non-destructive testing of finished pipes, ensuring that every batch of products comes with a Material Report (MTC) conforming to EN 10204 3.1.
For overseas logistics, we employ anti-scattering steel strapping and scientifically load according to container weight limits. We maintain ample inventory of standard specifications, enabling delivery within 7 working days; for special lengths, normalizing treatments, or customized testing requirements, the production cycle is typically 15 to 30 days. We recommend that project purchasers develop procurement plans in advance based on project schedules to mitigate delivery risks caused by fluctuations in steel mill production cycles.
For marine engineering, high salt spray environments, or extreme climate projects, the corrosion resistance of the pipes is crucial. We offer high-standard hot-dip galvanizing and zinc-aluminum-magnesium coating treatments, with a zinc layer thickness consistently above 85μm and salt spray resistance exceeding 3000 hours. This long-lasting anti-corrosion treatment not only eliminates the tedious process of on-site repainting but also significantly reduces post-project maintenance costs, providing strong protection for the entire lifecycle investment of the project.
Currently, this product's applications cover multiple industries globally, demonstrating its exceptional practicality. It is widely used in large-scale building steel structures, industrial plant frames, bridge supports, and municipal infrastructure projects. It is also a core material for engineering machinery bases, equipment supports, port equipment, warehouse racking, and curtain wall projects. Whether for large-scale engineering projects with bulk purchases or customized orders from foreign trade intermediaries, it can be precisely matched.
As a source factory with many years of experience in steel exports, we consistently focus on the customization and bulk supply of high-quality Hot-Rolled Square and Rectangular Steel Tubes. Without intermediary markups, we offer precise customization services for dimensions, materials, and surface treatments, supporting full container exports and less-than-container load (LCL) shipments with stable delivery cycles. If you have related procurement needs, project material selection questions, or require the latest foreign trade quotations and product parameter information, please feel free to contact us. We will provide you with professional one-on-one selection solutions and efficient export services.
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