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Technical Specifications
Product Overview
Metallurgical Characteristics
Q355B is a low alloy high strength structural steel with a predominantly ferritic-pearlitic microstructure. The controlled addition of alloying elements such as manganese, silicon, and copper promotes solid solution strengthening and improved atmospheric corrosion resistance. The fine-grain structure achieved through controlled rolling enhances both strength and toughness, making it ideal for structural applications requiring high strength-to-weight ratios.
Heat Treatment Process
MetalZenith employs controlled rolling followed by normalization at 890-930°C with controlled cooling rates to achieve optimal mechanical properties. Our thermomechanical controlled processing (TMCP) technology ensures uniform grain refinement and enhanced impact toughness while maintaining excellent weldability characteristics essential for structural fabrication.
Manufacturing Excellence
Our advanced manufacturing process incorporates continuous casting, controlled rolling with precise temperature monitoring, and accelerated cooling techniques. MetalZenith's quality control systems ensure consistent chemical composition, mechanical properties, and dimensional accuracy throughout production, meeting the stringent requirements of modern structural engineering applications.
Specialized Quality Testing
Q355B undergoes comprehensive testing protocols including welding performance evaluation using standard procedures, forming capability assessment through bend testing, fatigue strength verification under cyclic loading, and atmospheric corrosion resistance testing. Our laboratory facilities conduct impact testing at -20°C, ultrasonic inspection for internal soundness, and complete chemical analysis to ensure compliance with international structural steel standards.
Structural Engineering Applications
The exceptional combination of high strength, excellent weldability, and superior formability makes Q355B ideal for building structures requiring seismic resistance, bridge construction demanding fatigue resistance, heavy machinery manufacturing needing high load-bearing capacity, vehicle chassis applications requiring crash performance, and general engineering projects where reliability and cost-effectiveness are paramount. MetalZenith provides technical support for structural design optimization and fabrication process development.
🧪 Chemical Composition
| Element | Composition (%) |
|---|---|
| Carbon (C) | ≤ 0.20 |
| Manganese (Mn) | 1.00 - 1.60 |
| Silicon (Si) | ≤ 0.55 |
| Phosphorus (P) | ≤ 0.025 |
| Sulfur (S) | ≤ 0.025 |
| Chromium (Cr) | ≤ 0.30 |
| Nickel (Ni) | ≤ 0.50 |
| Copper (Cu) | ≤ 0.55 |
⚙️ Mechanical Properties
| Property | Value |
|---|---|
| Yield Strength (MPa) | ≥ 355 |
| Tensile Strength (MPa) | 470 - 630 |
| Elongation (%) | ≥ 20 |
| Impact Energy at -20°C (J) | ≥ 27 |
| Hardness (HB) | ≤ 187 |
| Fatigue Strength (MPa) | 160 - 180 |
🔬 Physical Properties
| Property | Value |
|---|---|
| Density (g/cm3) | 7.85 |
| Melting Point (°C) | 1510 - 1540 |
| Thermal Conductivity (W/m·K) | 49.8 |
| Thermal Expansion (×10??/K) | 12.5 |
| Elastic Modulus (GPa) | 210 |
| Poisson's Ratio | 0.30 |
📏 Product Specifications
| Specification | Details |
|---|---|
| Available Forms | Plates, Sheets, Beams, Channels, Angles, Bars |
| Thickness Range | 3 - 150mm |
| Width Range | 1000 - 4200mm |
| Length Range | 6000 - 18000mm |
| Standards Compliance | GB/T 1591, EN 10025-2, JIS G3106 |
| Heat Treatment Condition | Normalized, TMCP, or As-Rolled |
| Surface Finish | Hot Rolled, Shot Blasted, Pickled |
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Our Advantages in Processing Q355B
Advanced Thermomechanical Processing
MetalZenith employs controlled rolling and precise normalization processes with real-time temperature monitoring to achieve optimal grain structure and enhanced mechanical properties. Our advanced TMCP technology ensures consistent strength, toughness, and weldability throughout the material thickness, specifically optimized for structural applications.
Comprehensive Structural Testing
Our Q355B steel undergoes rigorous testing protocols including welding performance evaluation, forming capability assessment, fatigue strength testing, and atmospheric corrosion resistance analysis. MetalZenith's quality assurance ensures superior performance in demanding structural applications with verified impact toughness at low temperatures.
Custom Fabrication Services
MetalZenith provides comprehensive custom processing services including precision cutting, forming, welding preparation, and heat treatment optimization. Our technical support team works closely with structural engineers to deliver tailored solutions for complex construction and engineering projects with guaranteed performance specifications.
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