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Technical Specifications
Product Overview
Metallurgical Characteristics
S690QL features a fine-grained tempered martensitic microstructure achieved through controlled quenching and tempering processes. The optimized alloy composition with chromium, molybdenum, and boron additions provides exceptional hardenability and strength while maintaining excellent toughness. The fine grain structure ensures superior impact resistance and fatigue performance critical for structural applications.
Heat Treatment Process
MetalZenith employs controlled austenitizing at 900-950°C followed by water quenching and tempering at 580-650°C. Our precise temperature control and optimized cooling rates ensure uniform transformation and optimal mechanical properties throughout the material cross-section.
Manufacturing Excellence
Our advanced production facility utilizes computer-controlled heat treatment systems with real-time monitoring of temperature profiles and cooling rates. The integration of automated handling systems ensures consistent quality and minimizes thermal stress variations during processing.
Specialized Quality Testing
MetalZenith conducts comprehensive testing including welding procedure qualification tests, cold bending tests to evaluate formability, rotating beam fatigue testing for cyclic loading performance, and salt spray corrosion testing for atmospheric exposure resistance. These specialized tests ensure optimal performance in structural applications.
Application Engineering Considerations
For building structures, S690QL enables lighter designs with reduced material usage while maintaining safety factors. In bridge engineering, the high strength-to-weight ratio allows for longer spans and reduced foundation requirements. For machinery manufacturing, the excellent fatigue resistance ensures extended service life under dynamic loading. In vehicle construction, the superior formability enables complex geometries while maintaining structural integrity.
🧪 Chemical Composition
| Element | Composition (%) |
|---|---|
| Carbon (C) | ≤ 0.20 |
| Manganese (Mn) | 1.00 - 1.70 |
| Silicon (Si) | 0.15 - 0.80 |
| Phosphorus (P) | ≤ 0.020 |
| Sulfur (S) | ≤ 0.010 |
| Chromium (Cr) | 0.30 - 1.50 |
| Molybdenum (Mo) | 0.10 - 0.70 |
| Boron (B) | 0.0008 - 0.005 |
⚙️ Mechanical Properties
| Property | Value |
|---|---|
| Yield Strength (MPa) | ≥ 690 |
| Tensile Strength (MPa) | 770 - 940 |
| Elongation (%) | ≥ 14 |
| Impact Energy at -40°C (J) | ≥ 30 |
| Hardness (HB) | 230 - 280 |
| Fatigue Strength (MPa) | ≥ 345 |
🔬 Physical Properties
| Property | Value |
|---|---|
| Density (g/cm3) | 7.85 |
| Melting Point (°C) | 1480 - 1520 |
| Thermal Conductivity (W/m·K) | 44.5 |
| Thermal Expansion (×10??/K) | 12.5 |
| Elastic Modulus (GPa) | 210 |
| Poisson's Ratio | 0.30 |
📏 Product Specifications
| Specification | Details |
|---|---|
| Available Forms | Plates, Sheets, Bars, Beams, Channels |
| Thickness Range | 3 - 80mm |
| Width Range | 1000 - 3200mm |
| Length Range | 6000 - 15000mm |
| Standards Compliance | EN 10025-6, ASTM A514, JIS G3106 |
| Heat Treatment Condition | Quenched and Tempered (Q+T) |
| Surface Finish | Hot Rolled, Shot Blasted, Pickled |
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Our Advantages in Processing S690QL
Advanced Quenching and Tempering Technology
MetalZenith utilizes precision-controlled quenching and tempering processes with real-time temperature monitoring and optimized cooling curves to achieve exceptional strength and toughness. Our advanced heat treatment ensures uniform microstructure and consistent mechanical properties throughout the material cross-section.
Comprehensive Structural Performance Testing
Our rigorous testing protocols include welding performance evaluation, cold forming capability assessment, fatigue strength testing under cyclic loading, and atmospheric corrosion resistance analysis. These specialized tests ensure optimal performance in demanding structural applications.
Custom Processing and Engineering Support
MetalZenith provides tailored processing solutions including precision cutting, forming, and heat treatment modifications to meet specific project requirements. Our technical team offers comprehensive engineering support for structural design optimization and material selection.
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