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Technical Specifications
Product Overview
Metallurgical Characteristics
EN S550 is a high-strength low-alloy (HSLA) structural steel featuring a fine-grained microstructure achieved through controlled thermomechanical processing. The steel exhibits a predominantly ferritic-bainitic microstructure with excellent combination of strength, toughness, and weldability. MetalZenith's advanced processing ensures optimal grain refinement through microalloying elements including vanadium, niobium, and titanium.
Heat Treatment Process
Our manufacturing process involves controlled rolling at temperatures between 900-1100°C followed by accelerated cooling to achieve the desired mechanical properties. The quenching and tempering process is precisely controlled with austenitizing at 900-950°C, followed by water quenching and tempering at 580-650°C. This thermal cycle ensures optimal strength-toughness balance and dimensional stability.
Manufacturing Excellence
MetalZenith employs state-of-the-art electric arc furnaces with secondary refining capabilities including ladle furnace and vacuum degassing. Our continuous casting and hot rolling facilities ensure consistent chemical composition and mechanical properties throughout the entire cross-section. Advanced process control systems monitor temperature, rolling parameters, and cooling rates in real-time.
Quality Standards & Testing
Every batch undergoes comprehensive testing including chemical analysis via optical emission spectroscopy, tensile testing per EN ISO 6892-1, Charpy V-notch impact testing per EN ISO 148-1, and hardness testing per EN ISO 6506. Ultrasonic testing and magnetic particle inspection ensure internal soundness. Our quality management system complies with ISO 9001:2015, ISO 14001:2015, and OHSAS 18001 standards, ensuring consistent product quality and environmental responsibility.
🧪 Chemical Composition
| Element | Composition (%) |
|---|---|
| Carbon (C) | ≤ 0.12 |
| Manganese (Mn) | 1.60 - 2.10 |
| Silicon (Si) | 0.10 - 0.50 |
| Phosphorus (P) | ≤ 0.020 |
| Sulfur (S) | ≤ 0.010 |
| Chromium (Cr) | 0.30 - 1.25 |
| Nickel (Ni) | 0.30 - 2.00 |
| Molybdenum (Mo) | 0.20 - 0.60 |
| Copper (Cu) | ≤ 0.50 |
| Aluminum (Al) | ≥ 0.015 |
| Vanadium (V) | 0.02 - 0.12 |
| Niobium (Nb) | 0.015 - 0.060 |
| Titanium (Ti) | 0.006 - 0.050 |
| Boron (B) | 0.0008 - 0.005 |
⚙️ Mechanical Properties
| Property | Value |
|---|---|
| Yield Strength (Rp0.2) | ≥ 550 MPa |
| Tensile Strength (Rm) | 640 - 820 MPa |
| Elongation (A5) | ≥ 17% |
| Impact Energy (KV at -40°C) | ≥ 30 J |
| Brinell Hardness (HBW) | 180 - 250 |
| Young's Modulus | 210 GPa |
| Poisson's Ratio | 0.30 |
| Fatigue Limit (107 cycles) | 275 MPa |
| Fracture Toughness (KIC) | 120 MPa·m1/2 |
| Reduction of Area (Z) | ≥ 50% |
🔬 Physical Properties
| Property | Value |
|---|---|
| Density | 7.85 g/cm³ |
| Melting Point | 1480 - 1520°C |
| Thermal Conductivity (20°C) | 42 W/m·K |
| Thermal Expansion Coefficient (20-100°C) | 12.5×10-6/K |
| Specific Heat Capacity | 460 J/kg·K |
| Electrical Resistivity (20°C) | 0.18 µΩ·m |
| Magnetic Permeability | Ferromagnetic |
| Curie Temperature | 770°C |
| Thermal Diffusivity | 11.6 mm²/s |
| Emissivity (oxidized surface) | 0.85 |
📏 Product Specifications
| Specification | Details |
|---|---|
| Available Forms | Plates, Sheets, Bars, Profiles, Tubes |
| Plate Thickness Range | 8 - 100 mm |
| Sheet Thickness Range | 3 - 8 mm |
| Maximum Plate Dimensions | 3000 × 12000 mm |
| Bar Diameter Range | 10 - 300 mm |
| Standards Compliance | EN 10025-6, ASTM A514, JIS G3106 |
| Surface Finish | Hot Rolled, Pickled, Shot Blasted |
| Dimensional Tolerance | ±0.5 mm (thickness), ±2 mm (width/length) |
| Edge Condition | Mill Edge, Slit Edge, Flame Cut |
| Delivery Condition | Quenched and Tempered (Q+T) |
| Testing Certificates | EN 10204 Type 3.1, 3.2 available |
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Our Advantages in Processing EN S550
Advanced Thermomechanical Processing
MetalZenith employs cutting-edge controlled rolling and accelerated cooling technology to achieve optimal microstructure and mechanical properties in EN S550, ensuring superior strength-to-weight ratios and excellent weldability.
Comprehensive Quality Control System
Our integrated quality management system includes real-time chemical analysis, automated mechanical testing, and advanced non-destructive testing methods, guaranteeing consistent material properties and full traceability for every product batch.
Custom Processing & Global Supply
MetalZenith offers extensive customization capabilities including precision cutting, forming, and surface treatment services, supported by our global logistics network ensuring timely delivery of EN S550 products worldwide.
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