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Help CenterRibbed Steel Bar 20mm 25mm 28mm ASTM A706 Grade 60 Low Alloy for Seismic Zone Reinforcement
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Welcome to Hemaokang Steel (Shandong) Co., Ltd. – your trusted partner in high-quality steel products. Our Ribbed Steel Bar 20mm, 25mm, 28mm ASTM A706 Grade 60 Low Alloy is specifically engineered for seismic zone reinforcement, offering superior ductility and strength to withstand extreme dynamic loads. As a company with an annual export value of US$50–100 million and ISO 9001 certification, we ensure every bar meets the strictest international standards. Whether you are constructing earthquake-resistant buildings, bridges, or infrastructure, our rebar provides the reliability and performance you need.
Product Overview
The ASTM A706 Grade 60 ribbed steel bar is a low-alloy, weldable reinforcement bar designed for applications where controlled tensile properties and seismic resistance are critical. Unlike standard Grade 60 rebar (ASTM A615), A706 requires a higher yield-to-tensile ratio and enhanced elongation, making it ideal for moment-resisting frames and ductile detailing in seismic zones. Available in three popular diameters – 20mm, 25mm, and 28mm – our bars are produced with precise ribbing patterns to ensure excellent bond with concrete.
Key Features & Technical Specifications
- Low Alloy Chemistry: Controlled carbon equivalent (Ceq) for improved weldability and reduced risk of cracking in field welding.
- High Ductility: Minimum elongation of 14% in 200mm gauge length, ensuring plastic deformation capacity under seismic events.
- Consistent Yield Strength: Grade 60 – minimum yield strength of 420 MPa (60 ksi) with a maximum of 550 MPa (80 ksi), as per ASTM A706.
- Excellent Bond: Uniform rib pattern (spacing, height, and inclination) conforming to ASTM A706/A706M, providing superior anchorage in concrete.
- Customizable Lengths: Available in standard lengths (6m, 12m) or cut-to-length per your project requirements.
- Straightness Tolerance: ≤ 3mm per meter, ensuring easy handling and accurate placement.
| Diameter (mm) | Nominal Weight (kg/m) | Cross-Sectional Area (mm²) | Yield Strength (MPa) | Tensile Strength (MPa) |
|---|---|---|---|---|
| 20 | 2.466 | 314.2 | ≥420 | ≥620 |
| 25 | 3.853 | 490.9 | ≥420 | ≥620 |
| 28 | 4.834 | 615.8 | ≥420 | ≥620 |
Additional Physical Properties: All bars undergo rigorous bend and re-bend tests to ensure ductility. The rib geometry is designed to maximize bond strength while maintaining ease of handling. Our manufacturing process includes hot-rolling followed by controlled cooling, ensuring uniform mechanical properties throughout the bar.
Benefits for Your Project
- Safety in Seismic Zones: ASTM A706 Grade 60 is the preferred material for special seismic systems (e.g., buckling-restrained braces, coupling beams) due to its guaranteed overstrength ratio and inelastic rotation capacity.
- Cost-Effective Construction: Higher ductility reduces the need for additional reinforcement, lowering material and labor costs while maintaining structural integrity.
- Weldable and Bendable: Low carbon equivalent (Ceq ≤ 0.55%) allows easy welding without preheating for most applications, saving fabrication time.
- Global Compliance: Meets ASTM A706/A706M standards recognized in North America, South America, Middle East, and other regions. Our bars are also widely accepted in projects requiring ACI 318 provisions for earthquake-resistant design.
- Consistent Quality: Every batch is tested in our in-house laboratory for chemical composition, mechanical properties, and dimensional accuracy. We provide Mill Test Certificates (MTC) upon request.
Trust & Reliability
Hemaokang Steel (Shandong) Co., Ltd. was established in 2025 but has quickly grown to an annual export value of US$50–100 million, serving markets across North America, South America, Europe, Asia, Africa, and Oceania. Our team of 51–100 skilled professionals ensures that every order is processed efficiently and delivered on time. We are ISO 9001:2015 certified, reflecting our commitment to quality management and continuous improvement. Our rebar is sourced from premium raw materials and processed using advanced rolling mills, guaranteeing consistent performance. Choose our ASTM A706 Grade 60 ribbed steel bar for your next seismic project – you will benefit from superior product quality, competitive pricing, and dedicated after-sales support. Contact us today for a quotation or to discuss your specific requirements.
Frequently Asked Questions (FAQ)
Q1: What is the difference between ASTM A706 and ASTM A615 rebar?
A: ASTM A706 is a low-alloy steel rebar specifically designed for seismic applications. It has tighter control on chemical composition (especially carbon equivalent), mandatory bend test, and a maximum yield strength limit to ensure ductility. ASTM A615 has no such limits and may have higher carbon content, making it less suitable for welding and seismic detailing.
Q2: Can I weld this rebar without preheating?
A: Yes, ASTM A706 Grade 60 is designed for good weldability. The carbon equivalent (Ceq) is typically below 0.55%, which allows welding using standard procedures (e.g., AWS D1.4) without preheating for most thicknesses. However, we recommend consulting your welding engineer for specific conditions.
Q3: What lengths are available?
A: We offer standard lengths of 6m, 9m, and 12m. Custom lengths from 4m to 18m are available upon request. Please contact our sales team for specific cut-to-length orders.
Q4: Do you provide Mill Test Certificates (MTC)?
A: Yes, we provide MTC for each heat number, including chemical analysis and mechanical test results. Third-party inspection (e.g., SGS, Bureau Veritas) can also be arranged at an additional cost.
Q5: What is the typical packaging for export?
A: Bars are bundled with steel straps, each bundle weighing approximately 2–3 metric tons. We can also provide waterproof wrapping, wooden pallets, or container loading as per your request. For sea freight, we use standard 20' or 40' containers.
Q6: What is the minimum order quantity (MOQ)?
A: Our MOQ is 25 metric tons per size. For trial orders, we may accept smaller quantities (e.g., 10–20 tons) subject to availability. Contact us for details.
Q7: Does this rebar meet the requirements for ACI 318 seismic design?
A: Yes, ASTM A706 Grade 60 is specifically referenced in ACI 318 for seismic force-resisting systems. It meets the ductility and strength requirements for special moment frames and other earthquake-resistant structures.
Q8: How long does delivery usually take?
A: For standard sizes and quantities, production takes 15–20 days after order confirmation. Shipping time depends on destination. We can arrange sea freight, air freight, or express courier. Please consult our logistics team for an accurate schedule.
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