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Technical Specifications
Product Overview
Metallurgical Characteristics
EN S355 is a non-alloy structural steel with a ferritic-pearlitic microstructure, manufactured through controlled rolling processes to achieve fine grain structure and enhanced mechanical properties. The steel exhibits excellent weldability due to its low carbon equivalent (CEV ≤ 0.47%) and balanced chemical composition.
Manufacturing Process
MetalZenith produces EN S355 using electric arc furnace steelmaking followed by ladle refining and continuous casting. The steel undergoes controlled rolling with precise temperature control (finishing temperature 850-950°C) to achieve optimal grain refinement. Accelerated cooling may be applied to enhance strength and toughness characteristics.
Heat Treatment Options
Standard delivery condition is hot rolled (AR). Normalizing at 900-950°C followed by air cooling can be performed to refine grain structure and improve mechanical properties. Stress relief annealing at 580-650°C may be applied for dimensional stability in machined components.
Welding Characteristics
EN S355 exhibits excellent weldability with all conventional welding processes including SMAW, GMAW, GTAW, and SAW. Preheating is typically not required for sections up to 30mm thickness. Post-weld heat treatment may be beneficial for stress relief in heavy sections or critical applications.
Quality Standards & Compliance
All MetalZenith EN S355 products comply with EN 10025-2:2019 standard and are manufactured under ISO 9001:2015 quality management system. Comprehensive testing includes chemical analysis, tensile testing, impact testing, and non-destructive examination as per EN 10204 requirements.
🧪 Chemical Composition
| Element | Content (%) | Specification |
|---|---|---|
| Carbon (C) | ≤ 0.20 | EN 10025-2 |
| Manganese (Mn) | ≤ 1.60 | EN 10025-2 |
| Silicon (Si) | ≤ 0.55 | EN 10025-2 |
| Phosphorus (P) | ≤ 0.035 | EN 10025-2 |
| Sulfur (S) | ≤ 0.035 | EN 10025-2 |
| Nitrogen (N) | ≤ 0.012 | EN 10025-2 |
| Copper (Cu) | ≤ 0.55 | Optional |
| Chromium (Cr) | ≤ 0.30 | Residual |
| Nickel (Ni) | ≤ 0.50 | Residual |
| Molybdenum (Mo) | ≤ 0.10 | Residual |
⚙️ Mechanical Properties
| Property | Value | Test Standard |
|---|---|---|
| Yield Strength (ReH) | 355-470 MPa | EN ISO 6892-1 |
| Tensile Strength (Rm) | 470-630 MPa | EN ISO 6892-1 |
| Elongation (A5) | ≥ 22% | EN ISO 6892-1 |
| Impact Energy (KV) at 20°C | ≥ 27 J | EN ISO 148-1 |
| Impact Energy (KV) at 0°C | ≥ 27 J | EN ISO 148-1 |
| Impact Energy (KV) at -20°C | ≥ 27 J | EN ISO 148-1 |
| Brinell Hardness (HB) | 140-200 HB | EN ISO 6506-1 |
| Young's Modulus | 210 GPa | EN ISO 6892-1 |
| Poisson's Ratio | 0.30 | Standard Value |
| Fatigue Limit (107 cycles) | 180-220 MPa | EN 1993-1-9 |
🔬 Physical Properties
| Property | Value | Temperature Range |
|---|---|---|
| Density | 7.85 g/cm³ | 20°C |
| Melting Point | 1450-1520°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 |
| Curie Temperature | 770°C | - |
| Thermal Diffusivity | 13.8 mm²/s | 20°C |
| Coefficient of Linear Expansion | 13.1×10-6/K | 20-200°C |
📏 Product Specifications
| Specification | Available Options | Standards |
|---|---|---|
| Product Forms | Plates, Sheets, Bars, Beams, Channels, Angles, Tubes | EN 10025-2 |
| Plate Thickness | 3-400 mm | EN 10029 |
| Sheet Thickness | 0.5-12 mm | EN 10051 |
| Bar Diameter | 6-300 mm | EN 10060 |
| Tube Outer Diameter | 10-1200 mm | EN 10210 |
| Surface Finish | Hot Rolled, Pickled, Shot Blasted, Machined | EN 10163 |
| Dimensional Tolerance | Class A, B, C per EN standards | EN 10029/10051 |
| Length Range | 3-18 meters (custom lengths available) | Customer Specification |
| Heat Treatment | As Rolled, Normalized, Stress Relieved | EN 10025-2 |
| Testing Requirements | Mill Test Certificate 3.1, Third Party Inspection | EN 10204 |
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Our Advantages in Processing EN S355
Advanced Controlled Rolling Technology
MetalZenith employs state-of-the-art controlled rolling processes with precise temperature control and deformation parameters, ensuring optimal grain refinement and enhanced mechanical properties. Our thermomechanical treatment capabilities deliver superior strength-to-weight ratios and improved toughness characteristics.
Comprehensive Quality Control System
Our integrated quality management system features real-time chemical analysis, automated mechanical testing, and advanced non-destructive testing methods. Every production batch undergoes rigorous inspection protocols including ultrasonic testing, magnetic particle inspection, and dimensional verification to guarantee consistent quality.
Global Supply Chain & Custom Solutions
MetalZenith's worldwide distribution network ensures reliable delivery to over 80 countries. We offer extensive customization capabilities including precision cutting, heat treatment services, surface finishing, and value-added processing to meet specific project requirements and reduce customer lead times.
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