Q355B Low Alloy High Strength Steel Square Billet – Heavy Structural Grade
Product Overview
Q355B low alloy high strength steel billet is a premium structural feedstock designed for heavy load-bearing steel products. Micro-alloyed with niobium and titanium to achieve high strength while maintaining good toughness and weldability, it delivers superior mechanical performance compared with standard mild carbon billets. This heavy structural grade is the standard feedstock for rolling heavy structural sections, beams and high strength pipes.
Why Choose CNB High Strength Billets?
Our high strength steel billets are sourced from certified structural steel mills with strict control over alloying elements and solidification structure. Every billet undergoes full mechanical testing and chemical analysis to ensure consistent performance in downstream rolling and forging. We offer a full range of strength grades and section sizes to match different heavy structural product requirements.
Key Specifications
| Item | Specification |
|---|---|
| Product Name | Q355B High Strength Steel Square Billet |
| Steel Grade | Q355B / S355JR / ASTM A572 Gr.50 |
| Section Type | Square billet, continuous cast |
| Section Size Range | 120×120mm – 250×250mm |
| Standard Lengths | 6m, 9m, 12m, custom cut |
| Alloying Elements | Nb, Ti micro-alloyed |
| Minimum Yield Strength | ≥355MPa |
| Impact Test | Charpy V-notch at room temperature |
| Applicable Standards | GB/T 1591, EN 10025-3, ASTM A572 |
Core Advantages
- High strength performance: 50% higher yield strength than mild carbon billets.
- Good toughness: Balanced strength and ductility for structural and forging applications.
- Heavy section capable: Suitable for rolling large heavy structural sections and beams.
- Consistent alloying: Precise micro-alloy control for uniform mechanical properties.
- Structural grade certified: Meets international structural steel standards.
Applications
This Q355B high strength billet is widely used as feedstock for rolling heavy structural sections, H-beams, heavy purlins, high strength seamless pipes, forged structural parts and heavy machinery components.
Get a Quotation
We supply high strength steel billets in various grades, sections and sizes for rolling, forging and structural applications. Full mechanical test reports and third-party inspection are available upon request. Contact our structural feedstock team for a detailed quotation.
