Import A36 Carbon Steel Square Bar — Buy in wholesale FOB from Supplier in China

Hongguan Steel Group Co. Ltd. offers A36 carbon steel square bar as a hot-rolled structural mild steel product, with side widths from 1.0mm to 400mm and custom lengths to buyer specification. The material conforms to ASTM A36 with cross-certification to SS400, Q235B, S45C and related grades including st37, st44, st52, a53, 1020, 1045 and CK45. This square bar format differs fundamentally from flat sheet or plate, providing uniform cross-sectional properties ideal for torsional and axial load applications. The supplier's location in Jinan, Shandong Province positions them within one of China's major steel-producing regions, with access to port infrastructure for export shipment.

The 1.0-400mm side width range covers everything from precision cold-finished small bar through heavy hot-rolled structural sections. At the small end (1.0-20mm), material may be cold-drawn or cold-rolled to tighter tolerances than hot-rolled bar; at 50mm and above, hot-rolled as-rolled condition with mill scale is standard. ASTM A36 square bar typically exhibits yield strength of 250 MPa minimum and tensile strength of 400-550 MPa in the hot-rolled condition, with carbon content around 0.25-0.29%. Equivalent grades SS400 and Q235B offer similar mechanical properties with slight variations in phosphorus and sulfur limits; S45C and 1045 are higher-carbon grades (0.42-0.50% C) with increased strength but reduced weldability, requiring distinct welding procedures.

Applications span construction framing, machinery manufacturing, fabrication of torsion-resistant members, conveyor systems, and general structural components where square section provides aesthetic or functional advantage over round or flat profiles. The supplier lists standard sea package or custom packaging, with payment by T/T or L/C. The zero response rate and harbor trust tier indicate limited engagement data on this marketplace; direct outreach to the Jinan address or Shandong regional office is advisable. Buyers should confirm whether the 1.0-400mm range represents stocked inventory or rolling-to-order capability, as minimum quantities and lead times differ substantially between precision small bar and heavy structural sections.

Hongguan Steel Group Co. Ltd. is located at 102-b5 Supporting Office Area of Customs Supervision Warehouse in Comprehensive Bonded Zone, No.5999 Aerospace Avenue, High Tech Zone, Jinan, Shandong Province, 250000, China. This address situates the company within a customs-supervised bonded zone, implying potential advantages for export processing, duty deferral, and streamlined customs clearance for international shipments. The supplier holds a harbor trust tier on this marketplace, with no response rate data available. The specific location within a bonded zone suggests the company may operate as a trading, processing or logistics entity rather than primary steel mill, though this requires direct confirmation.

The listing provides no information on annual turnover, number of employees, production equipment, quality system certifications, or export history. The custom specification describes the product thoroughly but does not clarify whether Hongguan Steel Group manufactures the square bar or sources from Shandong-based mills. The comprehensive bonded zone location could indicate a focus on export consolidation, value-added processing (cutting, chamfering, surface treatment), or bonded warehousing. Buyers should verify actual manufacturing source, mill certificate origin, and whether the company holds direct mill agency or operates as independent trader. Response reliability and technical depth of commercial replies should be assessed during initial inquiry phase.