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Corrosion Resistant Carbon Steel Marine Engineering Reliable Square Hollow Section. Customizable Dimensions: Diameter 25-300mm, Wall Thickness 1.5-10mm, Length fully customized. Wide Application Range: Suitable for machinery, solar, bridges, ships, oil/gas, and construction. Flexible MOQ Options: 10 tons for standard specs, 20 tons for custom, negotiable for trials. Fast Sample Availability: Free samples (1-2 pcs, <1kg) with 3-5 working days lead time. Strict Quality Control: Includes hydrostatic tests, non-destructive testing, and full reports. Global Shipping Network: Ships from Tianjin, Jingtang, Qingdao with door-to-door options.