Hot-Rolled Steel Rebar is a ribbed reinforcing bar produced by heating steel billets and passing them through multiple rolling stands. The rolling process forms the required diameter and rib pattern in one continuous section.
The ribs provide mechanical interlock with concrete and help transfer forces between the steel and concrete. Rebar selection therefore depends on the specified grade, diameter, ductility, rib geometry, length and applicable standard.
Rongheng supplies HRB400, HRB400E, HRB500 and HRB500E Hot-Rolled Steel Rebar in diameters from Φ6 to Φ40 mm. Standard lengths are 9 m and 12 m, with custom lengths from 6–15 m and agreed fabrication available for project orders.
| Item | Specification |
|---|---|
| Product | Hot-Rolled Steel Rebar |
| Product type | Hot rolled ribbed reinforcing bar |
| Grades | HRB400, HRB400E, HRB500, HRB500E |
| Diameter | Φ6, Φ8, Φ10, Φ12, Φ14, Φ16, Φ18, Φ20, Φ22, Φ25, Φ28, Φ32, Φ40 mm |
| Standard length | 9 m, 12 m |
| Custom length | 6–15 m |
| Small coil supply | Available for suitable small-diameter products |
| Surface | Hot-rolled mill scale, uncoated |
| Main standard | GB 1499.2-2024 |
| Processing | Cutting, bending, threading, stirrup forming and other agreed fabrication |
The four grades cover two nominal strength levels. The E grades have additional requirements for seismic applications.
| Grade | Yield Strength | Tensile Strength | Elongation After Fracture |
|---|---|---|---|
| HRB400 / HRB400E | ≥400 MPa | ≥540 MPa | ≥16% |
| HRB500 / HRB500E | ≥500 MPa | ≥630 MPa | ≥15% |
HRB400 is commonly used for general reinforced-concrete structures. HRB400E is specified where seismic-grade reinforcement is required. HRB500 and HRB500E provide a higher nominal strength level where required by the structural design.
HRB400 and HRB400E have the same nominal yield-strength level, but HRB400E has additional seismic requirements. The required grade should follow the structural drawings and applicable design code.
The production process starts with steel billets and forms the finished bar through controlled rolling:
Steel billet → reheating → rough rolling → intermediate rolling → finishing rolling → rib forming → controlled cooling → straightening / cutting → inspection → bundling
Rolling passes determine the bar diameter and rib geometry. Controlled cooling after rolling helps establish the required mechanical properties.
| Diameter | Common Use |
|---|---|
| Φ6–Φ12 mm | Stirrups, slabs, secondary reinforcement and smaller structural members |
| Φ14–Φ25 mm | Main reinforcement for beams, columns, slabs and foundations |
| Φ28–Φ40 mm | Heavy foundations and heavily loaded structural members |
These are common purchasing references rather than structural design rules. The required diameter depends on the reinforcement schedule, steel area, spacing, concrete member and structural calculation.
Hot-Rolled Steel Rebar is used to reinforce concrete structures in building, industrial and infrastructure projects.
Foundation reinforcement is determined by the structural design rather than concrete thickness alone. Load, soil conditions, foundation geometry, bar spacing, concrete cover and development length all affect the reinforcement arrangement.
Φ28–Φ40 mm rebar may be specified for heavily loaded foundations and structural members, while smaller diameters are commonly used for secondary reinforcement and stirrups. Equipment foundations may also require consideration of concentrated loads and vibration.
Rebar can be supplied in standard straight lengths or fabricated according to the reinforcement schedule.
For project orders, customers can provide a bar bending schedule, cutting list or fabrication drawings before production. Required lengths and shapes can then be prepared according to the approved schedule.
Rebar may be used in welded reinforcement assemblies when the steel grade, welding procedure and project requirements permit it.
Welding should be checked against the material grade, welding procedure and applicable construction requirements before fabrication. Lap splices, mechanical couplers and welded connections are different connection methods and should follow the structural design.
Hot-Rolled Steel Rebar is supplied without a corrosion-protection coating. Its dark surface is normally covered by hot-rolling mill scale, which is different from active red-brown rust.
Storage conditions should also be considered. Long-term exposure to moisture, standing water or direct contact with the ground can lead to corrosion before installation.
Rebar inspection covers the steel grade, dimensions, rib geometry and mechanical properties, as well as surface condition and traceability.
Material certificates and agreed inspection records can be supplied with project orders. Third-party inspection can also be arranged when required by the contract.
Rebar is commonly purchased by weight but installed according to the diameter, length and quantity of individual bars.
For bulk orders, the purchase list should therefore separate each diameter and length instead of specifying only total tonnage. The theoretical unit weight can be used for material planning, while the settlement method should be agreed in the purchase contract.
Rongheng's supply chain is based in Tianjin Daqiuzhuang, providing access to rebar supply, steel processing and regional logistics.
HRB400, HRB400E, HRB500 and HRB500E can be arranged according to the specified grade and project requirements. Standard 9 m and 12 m lengths are available, with custom lengths from 6–15 m for suitable project orders.
For export orders, rebar can be bundled and prepared for container loading and long-distance transportation. Material certificates and inspection records can be supplied according to the purchase contract.
It is used to reinforce concrete structures such as buildings, foundations, bridges, roads, tunnels, industrial facilities and municipal infrastructure.
Both have a nominal yield-strength level of 400 MPa, but HRB400E has additional requirements for seismic applications. The required grade should follow the structural drawings and applicable design code.
HRB400 has a nominal yield-strength level of 400 MPa, while HRB500 has a nominal yield-strength level of 500 MPa. The required grade depends on the structural design.
The available range is Φ6–Φ40 mm, including Φ6, Φ8, Φ10, Φ12, Φ14, Φ16, Φ18, Φ20, Φ22, Φ25, Φ28, Φ32 and Φ40 mm.
Standard lengths are 9 m and 12 m. Custom lengths from 6–15 m can be discussed according to project requirements.
Yes. Cutting, bending, threading, stirrup forming and other agreed fabrication can be arranged according to the reinforcement schedule.
The two grades should not be treated as automatically interchangeable. Where the project specifies seismic-grade HRB400E, the specified E grade should be supplied.
Normally, the dark surface is hot-rolling mill scale. This should be distinguished from active corrosion, which generally produces visible red-brown rust and may cause section loss when severe.
It can be welded for suitable grades and applications when the welding procedure meets the applicable project requirements. Weldability should be confirmed before fabrication.
Rebar should be kept above the ground where water can drain away. Long-term contact with standing water should be avoided to reduce corrosion before installation.
Rebar is commonly quoted and purchased by tonne, while installation is based on bar diameter, length and quantity. The settlement method should be agreed before shipment.
Material certificates and agreed inspection records can be supplied according to project requirements. Third-party inspection can also be arranged when required.
Address
Secondary Arterial Road No. 2-1, Expansion Area of Daqiuzhuang Industrial Zone, Jinghai District, Tianjin, China
Tel
