S235JR Welded Rectangular Structural Steel Pipe

Introduction to S235JR Welded Square Structural Tubes

To form square steel profiles, a suitable base tube, i.e., a round steel pipe, is first formed. Then, rollers are used to gradually press the round steel pipe into a square hollow profile. The entire process is completed online. Square and rectangular steel materials are used. Square hollow profiles or square tubes are produced using cold forming and welding processes. The raw materials can be hot-rolled steel, cold-rolled steel, pre-galvanized steel, or stainless steel. Square and rectangular steel pipes have the advantage of higher bending strength, while the round hollow section has superior torsional stiffness.

Surface Treatment of S235JR Welded Square Tubes

The surface treatment of S235JR welded square tubes after forming and welding depends primarily on their end application. The most common treatment is hot-dip galvanizing, which involves immersing the tube in molten zinc to form a dense coating that provides both physical barrier and cathodic protection, offering excellent corrosion resistance, particularly suitable for outdoor structures or humid environments. Alternatively, sandblasting (shot blasting) can be used to remove oxide scale and increase surface roughness, providing good adhesion for subsequent painting or coating. Epoxy resin spraying or powder coating can also be applied directly, achieving specific colors and appearances while enhancing corrosion resistance and aesthetics.

About us

Our company is a professional steel export trading enterprise, and we have successively passed the certifications of two authoritative systems: Alibaba Enterprise Certification and SGS Product Conformity Assessment. Leveraging Alibaba's international trade channels and the endorsement of a trusted company, we have established efficient online supply chain connectivity. Simultaneously, through SGS's rigorous assessment of the conformity of exported products, we ensure that all steel products meet the standards and regulations of the destination country, effectively mitigating customs clearance risks and improving cross-border trade efficiency.

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