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Technical Specifications
Product Overview
Metallurgical Characteristics
GR350 exhibits a fine-grained ferritic-pearlitic microstructure achieved through controlled rolling and microalloying additions. The strategic use of niobium, vanadium, and titanium promotes grain refinement and precipitation strengthening, resulting in an optimal balance of strength, toughness, and weldability essential for structural applications.
Heat Treatment Process
MetalZenith employs thermomechanical controlled processing (TMCP) with controlled rolling temperatures between 850-950°C followed by accelerated cooling. This process optimizes the austenite-to-ferrite transformation, ensuring uniform mechanical properties and enhanced structural performance.
Manufacturing Excellence
Our advanced production facility utilizes computer-controlled rolling mills with precise temperature monitoring and cooling systems. Real-time process control ensures consistent chemical composition and mechanical properties throughout each production batch, meeting the stringent requirements of structural engineering applications.
Specialized Quality Testing
GR350 undergoes comprehensive testing including weldability assessment per AWS D1.1, bend testing for formability evaluation, fatigue testing under cyclic loading conditions, and atmospheric corrosion resistance testing. Impact testing at various temperatures ensures reliable performance in diverse environmental conditions.
Structural Engineering Applications
The superior strength-to-weight ratio and excellent weldability of GR350 make it ideal for building construction where seismic resistance is critical, bridge engineering requiring fatigue resistance, heavy machinery manufacturing demanding high load capacity, automotive chassis construction, and general engineering applications requiring reliable structural performance under dynamic loading conditions.
🧪 Chemical Composition
| Element | Composition (%) |
|---|---|
| Carbon (C) | ≤ 0.23 |
| Manganese (Mn) | 1.35 - 1.65 |
| Silicon (Si) | 0.15 - 0.40 |
| Phosphorus (P) | ≤ 0.030 |
| Sulfur (S) | ≤ 0.030 |
| Niobium (Nb) | 0.005 - 0.050 |
| Vanadium (V) | 0.01 - 0.15 |
| Titanium (Ti) | 0.006 - 0.024 |
⚙️ Mechanical Properties
| Property | Value |
|---|---|
| Yield Strength (MPa) | ≥ 350 |
| Tensile Strength (MPa) | 450 - 620 |
| Elongation (%) | ≥ 21 |
| Impact Energy at 0°C (J) | ≥ 27 |
| Hardness (HB) | 140 - 190 |
| Fatigue Strength (MPa) | ≥ 160 |
🔬 Physical Properties
| Property | Value |
|---|---|
| Density (g/cm3) | 7.85 |
| Melting Point (°C) | 1510 - 1540 |
| Thermal Conductivity (W/m·K) | 50.2 |
| Thermal Expansion (×10??/K) | 11.8 |
| Elastic Modulus (GPa) | 200 |
| Poisson's Ratio | 0.30 |
📏 Product Specifications
| Specification | Details |
|---|---|
| Available Forms | Plates, Beams, Channels, Angles, Bars, Tubes |
| Thickness Range | 3 - 80mm |
| Width Range | 1000 - 3500mm |
| Length Range | 6000 - 15000mm |
| Standards Compliance | ASTM A572 Grade 50, EN 10025-4 S355MC |
| Heat Treatment Condition | Hot Rolled, Normalized, or TMCP |
| Surface Finish | Mill Scale, Shot Blasted, Pickled |
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Our Advantages in Processing GR350
Advanced Thermomechanical Processing
MetalZenith utilizes controlled rolling with precise temperature control and accelerated cooling technology to achieve optimal grain refinement in GR350 steel. Our advanced processing ensures consistent mechanical properties, enhanced strength, and superior weldability throughout the material cross-section.
Comprehensive Structural Testing
Our GR350 steel undergoes extensive testing including Charpy V-notch impact testing, bend testing for formability, fatigue strength evaluation, and atmospheric corrosion resistance assessment. We also conduct comprehensive weldability testing to ensure optimal performance in fabricated structures.
Custom Fabrication Solutions
MetalZenith provides complete customization services including precision cutting, forming, welding preparation, and surface treatment. Our technical team offers engineering support for structural design optimization and material selection to meet specific project requirements.
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