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Hot Dipped Galvanized Flat Steel Bar Q235B Q355b. High-quality Q235B/Q355B carbon steel with hot dipped galvanized finish for excellent corrosion resistance. Full size range available from 20*3mm to 150*12mm, with standard lengths 6m/12m or custom cut to your requirements. Strictly produced in accordance with GB/T 702 standard, widely used in construction, photovoltaic grounding, and other engineering projects.