Overview
Solid threaded steel bars, also known as deformed reinforcing bars or rebar, are a cornerstone of modern construction. Their ribbed surface enhances bonding with concrete, ensuring structural integrity under tension. Widely used in seismic-resistant designs, these bars are manufactured to strict international standards like ASTM A615 (U.S.) and GB/T 1499.2 (China). Threaded bars are differentiated from plain rounds by their surface deformations, which prevent slippage within concrete. They are typically produced in diameters ranging from 6mm to 50mm, with lengths customized for project requirements. The threading allows for coupler connections, enabling efficient assembly in precast applications.
Structure and Working Principle
The bar’s ribbed pattern is rolled onto the surface during hot-forming, creating mechanical interlock with concrete. This design redistributes stress evenly, reducing crack propagation. Threads are either cut or rolled post-production, with rolled threads offering higher fatigue resistance. Under load, the bar’s high yield strength (335–500 MPa, depending on grade) prevents permanent deformation. The elastic modulus of approximately 200 GPa ensures predictable behavior under tension. Couplers or threaded end anchors transfer forces between connected bars, eliminating the need for overlap splicing in tight spaces.
Key Features
1. **Strength-to-Weight Ratio**: Superior tensile strength compared to plain steel, enabling lighter structures. 2. **Corrosion Options**: Epoxy-coated or galvanized variants for harsh environments (e.g., coastal areas). 3. **Weldability**: Low-carbon grades allow welding with proper precautions to avoid embrittlement. Thread geometry is critical—coarse threads suit general construction, while fine threads provide precision in machinery applications. Bars are often color-coded at mills for grade identification (e.g., HRB400 may have yellow paint marks).
Application Areas
Primary applications include high-rise buildings, infrastructure projects (bridges, tunnels), and industrial flooring. In seismic zones, threaded bars are used in moment-resisting frames due to their ductility. Specialized uses encompass rock bolting in mining and soil nailing for slope stabilization. Precast concrete manufacturers rely on threaded ends for rapid assembly, reducing on-site labor. Offshore platforms often specify stainless steel threaded bars for saltwater resistance.
Maintenance and Precautions
Storage should avoid ground contact; stacking on timber pallets prevents moisture absorption. Rust can be removed with wire brushing, but pitting may require bar replacement. During installation, avoid sharp bending near threads to prevent stress concentrations. Inspect couplers for proper engagement—cross-threading compromises strength. In corrosive environments, apply sacrificial anodes or cathodic protection systems.
B2B Procurement Guide
1. **Certifications**: Require mill test certificates confirming chemical composition and mechanical properties. 2. **MOQs**: Standard orders are typically 20–30 tons; small batches may incur premiums. 3. **Lead Time**: Domestic suppliers deliver in 7–14 days; imported bars require 4–8 weeks. Negotiate pricing based on quarterly steel indices (e.g., CRU). For large projects, consider just-in-time delivery to minimize inventory costs. Audit suppliers for quality control processes like ultrasonic testing.
Related Manufacturers
- 主营：[]
- 主营：镀锌管、镀锌钢管、钢管、国标螺纹钢、螺纹钢、螺纹钢加工、敬业螺纹钢、钢材、热镀锌钢管、钢塑复合管、螺旋管、螺旋钢管、无缝管、无缝钢管、镀锌无缝钢管、镀锌方管、方管、角钢、镀锌槽钢、镀锌角钢、钢板、钢筋、钢筋加工、工字钢、中厚板
- 主营：钢管桩、冷轧卷、优碳钢、螺纹钢、酸洗钢板、热轧钢板、结构钢板、热平直板、黄铜闸阀、锅炉钢板、高强钢板、空调支架、冲压卷料、酸洗卷板、冷轧薄板、矩形钢管、热轧角钢、等边角钢、工字型钢、普碳板卷、镀锌c型槽、花纹钢板材、酸洗平直板、不锈钢管、不锈钢板、阀门
- 主营：镀锌方管、镀锌管、镀锌板、螺纹钢、冷板、热轧板、中板、角钢、槽钢、工字钢、H型钢、焊管、方管、酸洗板、冷轧板、开平板
- 主营：中厚板、工字钢、三角铁、螺纹钢、花纹板、无缝管、镀锌管、镀锌方管、热轧钢板、镀锌角钢、镀锌角铁、中板、开平板、耐磨板、花纹钢板、H型钢、镀锌槽钢、方管、螺旋管、架子管、焊管、镀锌扁钢、角铁、幕墙方管
- 主营：镀锌网、勾花网、铁丝网、螺纹钢、强螺母、钢花管、防护网、内螺纹、外六角、蘑菇头、强锚杆、空心锚杆、矿用管缝、六角螺母、锚杆钻头、一字钻头、六角螺栓、圆头方颈、桥梁变径、矿用螺母、钢筋套筒、扭矩力母、接头金属、法兰螺母、中空锚杆
- 主营：角钢、槽钢、工字钢、实心圆钢、镀锌方管、方管、钢板、H型钢
- 主营：瓦楞板、冷拔扁钢、镀锌花纹板、不锈钢螺纹钢、镀锌卷板
- 主营：耐磨板、耐候板、耐磨钢板、HRB400三级螺纹钢、镀锌h型钢、国标h型钢、焊接h型钢、不锈钢卷板、钢板耐腐蚀、抗腐蚀钢板、不锈钢冷轧板、高温不锈钢板、盘条、线材、精密管、钢板切割、圆钢、钢丝、无缝钢管、精密钢管、钢板、冷轧钢卷、冷轧钢板、分条加工、耐候圆钢、耐低温线材
- 主营：螺纹钢、防腐管、防腐钢管
- 主营：hrb400螺纹钢、321冷轧、冷轧板、不锈钢板
- 主营：定位销、GB1096平键、GB1097平键、GB117实心圆锥销、304平键、不锈钢平键、导向平键、非标螺栓
- 主营：实心圆钢、厚壁焊管
- 主营：螺纹钢、镀锌角钢
- 主营：镀锌卷、钢板材、镀锌管、螺纹钢、热板卷、钢跳板、无缝管、热镀锌、工字钢、镀锌板、方矩管、镀锌钢板、耐热钢板、镀锌方管、热镀扁钢、热轧钢板、冷拉扁钢、钢管镀锌、冷轧卷板、电镀扁铁、螺旋焊管、圆钢棒材、包钢钢板、弹簧扁钢、镀锌槽钢
- 主营：螺纹钢、hpb300 圆钢、hrb500e 检测钢筋、花纹板
- 主营：热镀锌、钢结构建筑、钢板、螺纹钢、低合金、耐磨板、冷轧板、圆钢、方矩管、工角槽、不锈钢管材
- 主营：精密管、不锈钢管、不锈钢加工件、螺纹钢、钢管加工、铜管、无缝管、毛细管、不锈钢管加工、合金管、铝管