High Strength Hot Rolled Steel Coil – S355JR / Q355B Structural Grade
Product Overview
High Strength Low Alloy (HSLA) hot rolled steel coil is a premium structural material designed for heavy-load engineering applications. This S355JR / Q355B grade delivers 50% higher yield strength than standard mild steel, enabling lighter and more efficient structural design. It is the material of choice for large-span bridges, heavy plant structures, offshore platforms, crane rails and pressure vessels requiring both high strength and good toughness.
Why Choose CNB High Strength HR Steel?
Our high strength hot rolled steel is sourced from top Chinese mills with strict alloy composition control and thermo-mechanical rolling processes to ensure consistent strength and toughness. We implement full quality control over chemical analysis, tensile testing and Charpy impact testing to guarantee compliance with international structural standards. With extensive stock of common HSLA grades and custom production capability, we can meet both standard project specifications and specialized engineering requirements.
Key Specifications
| Item | Specification |
|---|---|
| Product Name | High Strength Hot Rolled Steel Coil (HR) |
| Steel Grade | Q355B / S355JR / ASTM A572 Gr.50 |
| Thickness Range | 2.0mm – 20.0mm |
| Standard Widths | 1000mm, 1250mm, 1500mm, 2000mm, 2500mm |
| Coil Inner Diameter | 760mm |
| Coil Weight | 5MT – 30MT per coil |
| Surface Condition | Black oxide, pickled & oiled option |
| Applicable Standards | GB/T 1591, EN 10025-3, ASTM A572 |
| Minimum Yield Strength | ≥355MPa |
| Impact Test | Charpy V-notch, JR quality at room temperature |
Core Advantages
- 50% higher strength: 355MPa minimum yield strength vs 235MPa for mild steel, enabling lightweight structural design.
- Good toughness: JR impact grade ensures ductility and resistance to brittle fracture.
- Excellent weldability: Suitable for all common structural welding methods.
- Weight and cost saving: Reduces total steel consumption and project cost for equivalent load capacity.
- International standards: Complies with European, American and Chinese structural standards for global projects.
Applications
This high strength hot rolled steel is widely used for heavy steel structures, bridge girders, offshore platforms, crane beams, pressure vessels, large-span plant frames, wind turbine towers and heavy machinery components.
Get a Quotation
We supply high strength hot rolled steel in a full range of grades from S235JR to S550MC with various toughness levels. Custom sizes, impact requirements and surface conditions can be arranged for your specific project. Contact our structural steel team for design support and a detailed quotation.
