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Technical Specifications
Product Overview
Metallurgical Characteristics
EN S690QL is a low-alloy, high-strength structural steel produced through advanced thermomechanical controlled processing (TMCP) followed by quenching and tempering heat treatment. The steel exhibits a fine-grained tempered martensitic microstructure with excellent combination of strength, toughness, and weldability. The controlled chemical composition with optimized carbon equivalent ensures superior mechanical properties while maintaining good formability and machinability characteristics.
Heat Treatment Process
MetalZenith employs precision-controlled quenching from austenitizing temperature of 900-950°C followed by tempering at 580-650°C to achieve the required mechanical properties. The quenching process utilizes advanced cooling systems to ensure uniform transformation throughout the material cross-section, while the tempering treatment optimizes the balance between strength and toughness. This heat treatment cycle produces a stable microstructure with excellent dimensional stability and stress relief.
Manufacturing Process Excellence
Our state-of-the-art production facility incorporates continuous casting technology, high-precision rolling mills with computerized process control, and advanced heat treatment systems. The thermomechanical controlled processing ensures optimal grain refinement and precipitation hardening, while real-time monitoring systems guarantee consistent quality throughout production. Post-processing operations include precision cutting, surface treatment, and comprehensive quality testing to meet exact customer specifications.
Quality Standards & Certifications
All EN S690QL steel products manufactured by MetalZenith comply with EN 10025-6 European standards and are produced under ISO 9001:2015 quality management system. Our comprehensive testing protocols include chemical analysis using optical emission spectroscopy, mechanical property verification through tensile and impact testing, ultrasonic inspection for internal soundness, and dimensional verification. Each delivery includes complete mill test certificates with full traceability documentation, ensuring compliance with international quality standards and customer specifications.
🧪 Chemical Composition
| Element | Composition (%) | Specification |
|---|---|---|
| Carbon (C) | ≤ 0.20 | EN 10025-6 |
| Manganese (Mn) | ≤ 1.70 | EN 10025-6 |
| Silicon (Si) | ≤ 0.80 | EN 10025-6 |
| Phosphorus (P) | ≤ 0.025 | EN 10025-6 |
| Sulfur (S) | ≤ 0.015 | EN 10025-6 |
| Chromium (Cr) | ≤ 1.50 | EN 10025-6 |
| Nickel (Ni) | ≤ 2.00 | EN 10025-6 |
| Molybdenum (Mo) | ≤ 0.70 | EN 10025-6 |
| Vanadium (V) | ≤ 0.12 | EN 10025-6 |
| Niobium (Nb) | ≤ 0.06 | EN 10025-6 |
| Titanium (Ti) | ≤ 0.05 | EN 10025-6 |
| Boron (B) | ≤ 0.005 | EN 10025-6 |
⚙️ Mechanical Properties
| Property | Value | Test Standard |
|---|---|---|
| Yield Strength (Rp0.2) | ≥ 690 MPa | EN ISO 6892-1 |
| Tensile Strength (Rm) | 770-940 MPa | EN ISO 6892-1 |
| Elongation (A5) | ≥ 14% | EN ISO 6892-1 |
| Impact Energy (KV) at -40°C | ≥ 30 J | EN ISO 148-1 |
| Impact Energy (KV) at -60°C | ≥ 27 J | EN ISO 148-1 |
| Brinell Hardness (HBW) | 230-300 | EN ISO 6506-1 |
| Young's Modulus | 210 GPa | EN ISO 6892-1 |
| Poisson's Ratio | 0.30 | ASTM E132 |
| Fatigue Limit (2×106 cycles) | 320 MPa | EN 6072 |
| Fracture Toughness (KIC) | 150 MPa·m1/2 | ASTM E399 |
🔬 Physical Properties
| Property | Value | Temperature Range |
|---|---|---|
| Density | 7.85 g/cm³ | 20°C |
| Melting Point | 1510°C | - |
| Thermal Conductivity | 54 W/m·K | 20°C |
| Thermal Expansion Coefficient | 12×10-6/K | 20-100°C |
| Specific Heat Capacity | 500 J/kg·K | 20°C |
| Electrical Resistivity | 0.16 µΩ·m | 20°C |
| Magnetic Permeability | Ferromagnetic | 20°C |
| Thermal Diffusivity | 13.8 mm²/s | 20°C |
| Curie Temperature | 770°C | - |
| Emissivity | 0.85 | 600°C |
📏 Product Specifications
| Specification | Available Options | Standards |
|---|---|---|
| Product Forms | Plates, Sheets, Bars, Profiles, Tubes | EN 10025-6 |
| Plate Thickness | 3-100 mm | EN 10025-6 |
| Sheet Thickness | 0.5-3.0 mm | EN 10025-6 |
| Width Range | 1000-4000 mm | EN 10025-6 |
| Length Range | 2000-18000 mm | EN 10025-6 |
| Surface Finish | Hot Rolled, Pickled, Shot Blasted | EN 10163 |
| Dimensional Tolerance | Class A, B, C | EN 10051 |
| Flatness Tolerance | ≤ 5 mm/m | EN 10029 |
| Edge Condition | Mill Edge, Trimmed Edge | EN 10025-6 |
| Delivery Condition | Quenched and Tempered (+QT) | EN 10025-6 |
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Our Advantages in Processing EN S690QL
Advanced TMCP Technology
MetalZenith utilizes cutting-edge Thermomechanical Controlled Processing (TMCP) technology with precision-controlled rolling temperatures and deformation schedules, ensuring optimal microstructure refinement and superior mechanical properties in EN S690QL steel production.
Comprehensive Quality Control
Our integrated quality management system features real-time chemical composition monitoring, automated mechanical testing, and advanced non-destructive testing capabilities, guaranteeing consistent EN S690QL steel properties and full compliance with international standards.
Custom Processing Solutions
MetalZenith offers extensive customization capabilities including precision cutting, forming, heat treatment modifications, and surface finishing services, enabling tailored EN S690QL steel solutions for specific application requirements with global logistics support.
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