Import Black Hollow Section — Buy in wholesale FOB from Supplier in China

The Black Hollow Section from Handan Zhengda Steel Pipe Group Co., Ltd. is a carbon structural steel profile manufactured by electric resistance welding (ERW) with square and rectangular cross-sections. Available grades include Q235B, Q355B, SS400, S235JR, S275JR, and S355JR per the source data, with wall thickness spanning 1.2mm to 18mm and outer dimensions from 20mm by 20mm up to 300mm by 300mm for square sections, and 20mm by 40mm to 400mm by 200mm for rectangular sections. The product conforms to GB6728-2017, ASTM A500 (Grades A, B, C), and EN10219 standards, positioning it for construction, mechanical engineering, and infrastructure applications where strength-to-weight ratio governs design.

Material selection among the offered grades depends on design stress, ambient temperature service, and welding procedure compatibility. Q235B and SS400 offer yield strengths of approximately 235 MPa and 245 MPa respectively, suitable for general structural use in non-critical applications. Q355B and S355JR provide higher yield strength around 355 MPa, appropriate for load-bearing frames, portal structures, and machinery guards where weight reduction or increased span is valued. Standard tolerances for external dimensions per EN10219-2 are plus or minus 1.0 percent with a minimum of plus or minus 0.5mm, while wall thickness tolerance is plus or minus 10 percent for hot-finished and plus or minus 12.5 percent for cold-formed sections; buyers should specify required tolerance class at enquiry.

Surface treatment options include hot-dip galvanising, oil coating, or black painting/lacquer, with bundle packaging standard for export. The hollow section format reduces material consumption versus solid bar or angle while maintaining bending and torsional stiffness, making it standard for columns, truss chords, conveyor frames, and agricultural equipment. Buyers should confirm steel origin, mill test certificate provision (EN 10204 3.1 or 3.2), and whether the supplier offers third-party inspection coordination. The Hebei location offers proximity to Tianjin Port for sea freight export, though buyers must verify current lead times and booking availability directly.

Handan Zhengda Steel Pipe Group Co., Ltd. is located at No 9 Juliang Road, Chengan County, Handan, Hebei Province, 056007, China. The supplier holds a harbor trust tier classification with a recorded 0.00 percent response rate and zero average response hours, signalling that direct communication channels may be underutilised or that the profile requires updated contact protocols. No employee count, annual turnover, production capacity tonnes per annum, or facility audit information is present in the source material.

The company lists structural steel hollow sections as its export product with standards coverage spanning Chinese, American, and European norms, suggesting production line flexibility for multi-destination markets. Certification claims include CE, SIREM, and ISO, though scope and validity dates are not detailed. Buyers should verify ISO 9001 certificate number and accrediting body, CE marking module (typically D1 or F for structural hollow sections), and whether SIREM refers to a specific mill system certification or a third-party audit programme. Direct factory inspection or video verification is advisable given the absence of response metrics.