In the current steel standards for reinforced concrete in my country, there are three strength grades for hot-rolled construction steel bars: 300, 400, and 500 MPa. Factory processing and distribution companies mainly purchase and process the following nine types of steel bars:
- HPB215 high-strength wire
- HPB300 high-strength wire
- Q300 hot-rolled round steel
- HRB400(E)/500(E) coil
- HRB400(E)/500(E)/600(E) threaded steel
- CRB550 cold-rolled ribbed steel bars
To fully meet the requirements for reinforced concrete construction projects across various industries, newly built specialized processing and distribution enterprises should have at least 11 types of mechanical processing equipment. Here are the main types of equipment and their processing ranges:
- Bending Machine
- Processes: HRB400/500/600 rebar, Q300 hot-rolled round steel
- Functions: Shearing, bending, and forming (0-180°)
- Steel bar diameter: φ10~40mm
- Bar Shearing Machine
- Processes: HRB400/500/600 rebar, Q300 hot-rolled round steel
- Maximum number of shears per time: ≥30
- Steel bar diameter: φ10~40mm
- Steel Bar Bending Machine
- Processes: HPB300 high-strength steel bar, CRB550 cold-rolled ribbed steel bar, HRB400 coil
- Functions: Straightening, bending, and cutting in one go
- Steel bar diameter: φ5~16mm
- Steel Bar Straightening and Cutting Machine (requires 4~6 production lines)
- Processes: HPB300 high-strength steel bar, HRB400 coil, CRB550 cold-rolled ribbed steel bar
- Cutting method: AC servo
- Straightening speed: ≥2m/s
- Steel bar diameter: φ5~16mm
- Rebar Sawing Machine
- Processes: HRB400/500/600 rebar, Q300 hot-rolled round steel
- Maximum number of shears at a time: ≥10
- Steel bar diameter: φ12~40mm
- Rebar Threading Machine
- Processes: HRB400/500/600 rebar, HRB400 coil (after straightening and shearing)
- Function: Straight thread joint processing
- Threading length: 80mm
- Steel bar diameter: φ12~40mm
- Steel Bar Welding Mesh Machine
- Processes: Cold-rolled ribbed steel mesh, hot-rolled ribbed steel mesh, cold-drawn wire mesh
- Cold-rolled ribbed steel diameter: φ5~11mm
- Hot-rolled ribbed steel diameter: φ6~12mm
- Cold-drawn wire diameter: φ4~7mm
- Steel Bar Welding Cage Machine
- Processes: Cold-rolled ribbed steel welding cage, hot-rolled ribbed steel welding cage, cold-drawn wire welding cage
- Cold-rolled ribbed steel diameter: φ5~12mm
- Hot-rolled ribbed steel diameter: φ6~32mm
- Cold-drawn wire diameter: φ4~10mm
