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Technical Specifications
Product Overview
Metallurgical Characteristics
S355J2 exhibits a fine-grained ferritic-pearlitic microstructure achieved through controlled rolling and normalization processes. The optimized carbon content and manganese levels provide excellent strength-to-weight ratio while maintaining superior weldability. Microalloying elements contribute to grain refinement and precipitation strengthening, resulting in enhanced mechanical properties and improved impact toughness at low temperatures.
Heat Treatment Process
MetalZenith employs controlled rolling at temperatures between 850-950°C followed by air cooling or normalization at 890-930°C. This thermomechanical processing ensures optimal grain size distribution and eliminates internal stresses, resulting in superior dimensional stability and enhanced mechanical properties throughout the material cross-section.
Manufacturing Excellence
Our advanced production facilities utilize electric arc furnace technology with secondary refining processes including ladle furnace treatment and vacuum degassing. This ensures precise chemical composition control and exceptional cleanliness levels, critical for structural applications requiring high reliability and performance consistency.
Structural Quality Testing
MetalZenith conducts comprehensive testing protocols including Charpy V-notch impact testing at -20°C, welding procedure qualification tests, bend testing for formability assessment, fatigue testing under cyclic loading conditions, and accelerated atmospheric corrosion testing. These specialized tests ensure optimal performance in demanding structural applications.
Application Engineering
For building construction, S355J2 provides excellent load-bearing capacity and seismic resistance. In bridge engineering, its superior fatigue strength and weather resistance ensure long-term structural integrity. For machinery manufacturing, the steel's excellent machinability and weldability enable complex component fabrication. In vehicle construction, the combination of high strength and formability allows for lightweight yet robust structural designs.
🧪 Chemical Composition
| Element | Composition (%) |
|---|---|
| Carbon (C) | ≤ 0.20 |
| Manganese (Mn) | ≤ 1.60 |
| Silicon (Si) | ≤ 0.55 |
| Phosphorus (P) | ≤ 0.025 |
| Sulfur (S) | ≤ 0.025 |
| Nitrogen (N) | ≤ 0.012 |
| Copper (Cu) | ≤ 0.55 |
| Chromium (Cr) | ≤ 0.30 |
⚙️ Mechanical Properties
| Property | Value |
|---|---|
| Yield Strength (MPa) | ≥ 355 |
| Tensile Strength (MPa) | 470 - 630 |
| Elongation (%) | ≥ 20 |
| Impact Energy at -20°C (J) | ≥ 27 |
| Hardness (HB) | 140 - 190 |
| Fatigue Strength (MPa) | 160 - 180 |
🔬 Physical Properties
| Property | Value |
|---|---|
| Density (g/cm3) | 7.85 |
| Melting Point (°C) | 1450 - 1520 |
| Thermal Conductivity (W/m·K) | 50.2 |
| Thermal Expansion (×10??/K) | 12.0 |
| Elastic Modulus (GPa) | 210 |
| Poisson's Ratio | 0.30 |
📏 Product Specifications
| Specification | Details |
|---|---|
| Available Forms | Plates, Sheets, Beams, Channels, Angles, Bars |
| Thickness Range | 3 - 80mm |
| Width Range | 1000 - 3200mm |
| Length Range | 6000 - 15000mm |
| Standards Compliance | EN 10025-2, ASTM A572, JIS G3106 |
| Heat Treatment Condition | Normalized or As-Rolled |
| Surface Finish | Hot Rolled, Pickled, Shot Blasted |
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Our Advantages in Processing S355J2
Advanced Thermomechanical Processing
MetalZenith utilizes controlled rolling technology with precise temperature control and optimized cooling rates to achieve fine-grain microstructure in S355J2 steel. Our advanced processing ensures superior mechanical properties, enhanced toughness, and excellent dimensional stability throughout the material cross-section.
Comprehensive Structural Testing
Our S355J2 steel undergoes extensive testing including Charpy V-notch impact testing at -20°C, welding performance evaluation, bend testing for formability assessment, fatigue strength analysis, and atmospheric corrosion resistance testing to ensure optimal performance in structural applications.
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 customers to develop tailored solutions for specific structural engineering requirements.
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