304 304L Customized Rectangular Polish Tube USB Square Stainless Steel Tube

304 304L Customized Rectangular Polish Tube USB Square Stainless Steel Tube. Precision Tolerance Control: Diameter tolerance up to 0.3%D and wall thickness up to 3%S for seamless tubes. Bright Annealing Process: Closed furnace with argon/nitrogen protection ensures clean, oxide-free metal surfaces. Extensive Material Range: Supplies Austenitic, Super Austenitic, Duplex, Nickel Alloy, Nickel, and Titanium grades. Advanced Manufacturing Equipment: Features high-speed multi-roll mills, automatic piercing lines, and precision cold-rolled lines. Comprehensive Quality Testing: Equipped with spectrometers, ultrasonic detectors, hydrostatic testers, and impact testers. Wide Application Scope: Ideal for ships, aerospace, oil/gas drilling, chemical industry, and construction. Customizable Dimensions: Wall thickness 0.2-3.5mm and max length up to 38 meters available. Global Certifications: ISO9001/14001/45001 certified with TUV, BV, DNV-GL, and ABS approvals.