HRB400 Steel Rebar

Overview of HRB400 Steel Rebar

HRB400 is the most widely used hot-rolled ribbed steel reinforcement bar in China and a major export grade to global construction markets. Specified under GB/T 1499.2 standard, HRB400 represents the third-generation high-strength reinforcement steel with a characteristic yield strength of 400 MPa, replacing older HRB335 grade as the standard rebar for reinforced concrete construction. The ‘HRB’ designation stands for Hot Rolled Ribbed Bar, and ‘400’ indicates the minimum yield strength in MPa.

HRB400 rebar features a distinctive crescent-shaped rib pattern rolled onto its surface, providing superior bond strength with concrete through mechanical interlocking. The grade is manufactured from low-alloy carbon steel with controlled additions of vanadium, niobium, or titanium to achieve the required strength through grain refinement and precipitation hardening. With excellent ductility (elongation ≥16%), reliable weldability, and proven performance in seismic regions, HRB400 has become the international benchmark for cost-effective high-strength concrete reinforcement.

Key Features and Manufacturing Standards

HRB400 steel rebar is produced through continuous hot rolling process from billet feedstock, with controlled cooling and microalloying to achieve the precise mechanical properties required by GB/T 1499.2 standard. The rib pattern is formed during the final rolling pass using grooved rolls, creating crescent-shaped transverse ribs and longitudinal ribs that provide bond strength typically 2-3 times higher than plain round bars.

The rebar is supplied in nominal diameter range from 6mm to 50mm, with standard lengths of 9 meters and 12 meters. Custom cut-to-length service is available for specific project requirements. Smaller diameters from 6mm to 12mm are also available in coiled form (typical coil weight 1.5-3 tons) for automatic stirrup bending machines and prefabrication mesh production. Each bar is marked with manufacturer identification, grade designation (HRB400), and diameter for full traceability throughout the construction supply chain.

Main Applications of HRB400 Steel Rebar

HRB400 steel rebar is the primary structural reinforcement material for reinforced concrete construction worldwide. In building construction, it is extensively used for column reinforcement, beam reinforcement, slab mesh, foundation footings, shear walls, and stair structures in residential buildings, commercial complexes, hospitals, schools, and high-rise developments. The grade’s high yield strength enables structural designers to reduce reinforcement quantity by 15-20% compared to lower grades, optimizing material cost and construction efficiency.

Infrastructure projects rely on HRB400 rebar for highway bridges, overpasses, tunnel linings, subway stations, airport runways, and port terminal structures. Hydraulic engineering applications include dam construction, water treatment plant tanks, sewage treatment facilities, and irrigation channel reinforcement. The grade is also used for industrial facility foundations, power plant structures, wind turbine bases, oil and gas processing facility civil works, and earthquake-resistant building construction in seismic regions where its proven ductility and energy absorption capacity are critical for life safety performance.

Why Choose Us for HRB400 Steel Rebar

Shandong Tanglu Metal Material Co., Ltd. supplies premium HRB400 steel rebar sourced from major Chinese steel mills including HBIS, Shougang, Ansteel, and Baosteel with stable production capacity exceeding 50,000 tons monthly. Every shipment of HRB400 rebar undergoes mandatory chemical composition analysis, mechanical property testing including yield/tensile/elongation/bending tests, and dimensional inspection per GB/T 1499.2 latest revision, ensuring full compliance with international quality standards.

We offer comprehensive diameter range from 6mm to 50mm in straight bar form (9m/12m lengths) and coiled form (6mm-12mm), with flexible packaging configurations to match container loading optimization for both 20FT FCL and 40FT FCL shipments. With established export experience to over 50 countries including Africa, Southeast Asia, Middle East, South America, and Eastern Europe, we support both small project orders and large infrastructure supply contracts. Each shipment includes original mill test certificate (MTC) conforming to EN 10204 3.1 standard, with EN 10204 3.2 and third-party inspection (SGS, BV, ABS, DNV, LR) available for critical structural projects.