Custom Flat Bar Black Companies & Pricelist

"Black" flat bar refers to hot-rolled steel in its primary as-rolled mill condition, characterized by a dark iron oxide scale (Fe3O4/FeO magnetite) formed during cooling on the cooling bed. It offers maximum ductility, excellent weldability, and superior cost-effectiveness for heavy structural and fabrication uses. In contrast, "bright" or cold-drawn flat bar undergoes secondary pickling and cold drawing, providing mirror-like finishes and ultra-tight dimensional tolerances for precision tooling, but at a 30% to 50% pricing premium.

Yes. Beyond standard sizes (widths 10mm–300mm; thicknesses 3mm–60mm), we operate dedicated rolling lines equipped with adjustable vertical and horizontal edging stands. We routinely roll custom metric and imperial dimensions for machinery manufacturers and special grating fabricators. Custom roll toolings can be commissioned with minimum order runs of 25 to 50 metric tons.

All three are low-carbon non-alloy structural steels with remarkable metallurgical compatibility. Q235B (GB/T 700) requires a minimum yield strength of 235 MPa and Charpy impact energy ≥ 27 Joules at +20°C, which exactly mirrors EN 10025-2 S235JR. ASTM A36 specifies a slightly higher minimum yield of 250 MPa (36 ksi) and does not mandate Charpy testing unless specified. HZXY provides multi-certified heats that satisfy the highest common denominator requirements across chemical composition, yield, tensile, and elongation.

For standard inventory sizes, our MOQ is as low as 1 to 5 metric tons per dimension. For scheduled mill production runs of specialized grades (e.g., Q355B, 45#, or custom widths), our typical rolling MOQ is 15 to 25 tons. Standard ex-mill production lead times range from 7 to 15 days, allowing rapid container dispatch from our Daqiuzhuang stockyards to Tianjin Port.

Yes. A core operational advantage of partnering with HZXY is our one-stop structural consolidation capability. International contractors and stockists can combine black flat bars, H-beams, channel steels, equal/unequal angles, hollow structural sections (SHS/RHS), deformed rebars, galvanized steel coils, and even PVC utility pipes within a single ocean shipment, consolidating customs clearance and slashing overall logistics costs.

Standard black flat bars are bundled bare with their natural hot-rolled oxide scale, which provides brief atmospheric resistance. For marine freight, we offer high-grade electrostatic rust-preventive oiling, clear varnish coating, or water-resistant woven plastic tarp wrapping with desiccant packs inside the bundles. Alternatively, our in-house hot-dip galvanizing lines can apply a thick zinc layer (400–600 g/m²) in accordance with ASTM A123 / ISO 1461.