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Technical Specifications
Product Overview
Metallurgical Characteristics
EH40 is a normalized fine-grained structural steel with a predominantly ferritic-pearlitic microstructure. The controlled rolling process followed by normalizing heat treatment at 900-950°C results in refined grain size (ASTM 8-10) and optimal precipitation of microalloying elements, providing excellent strength-toughness balance.
Heat Treatment Process
MetalZenith employs controlled normalizing at 920±20°C followed by air cooling to achieve uniform microstructure and mechanical properties. Optional tempering at 580-620°C can be applied for enhanced toughness in critical applications. Our computer-controlled furnaces ensure precise temperature uniformity and heating rates.
Manufacturing Process
Production begins with electric arc furnace melting followed by ladle refining and vacuum degassing to achieve ultra-low sulfur content. Continuous casting produces high-quality slabs which undergo controlled rolling with precise temperature control. Final normalizing treatment ensures optimal mechanical properties and stress relief.
Quality Standards & Testing
All EH40 products undergo comprehensive testing including chemical analysis, tensile testing, Charpy V-notch impact testing at -40°C and -60°C, hardness measurement, and ultrasonic inspection. Third-party certification from major classification societies ensures compliance with offshore construction requirements and international standards.
Weldability & Fabrication
EH40 exhibits excellent weldability with carbon equivalent (CEV) typically ≤ 0.41%. Preheating at 100-150°C is recommended for thick sections. Post-weld heat treatment may be required for stress relief in critical applications. The steel is suitable for all conventional welding processes including SMAW, GMAW, SAW, and FCAW.
🧪 Chemical Composition
| Element | Composition (%) |
|---|---|
| Carbon (C) | ≤ 0.18 |
| Manganese (Mn) | 0.90 - 1.60 |
| Silicon (Si) | 0.10 - 0.50 |
| Phosphorus (P) | ≤ 0.025 |
| Sulfur (S) | ≤ 0.015 |
| Chromium (Cr) | ≤ 0.20 |
| Nickel (Ni) | ≤ 0.40 |
| Molybdenum (Mo) | ≤ 0.08 |
| Copper (Cu) | ≤ 0.35 |
| Aluminum (Al) | ≥ 0.015 |
| Niobium (Nb) | ≤ 0.05 |
| Vanadium (V) | ≤ 0.10 |
| Titanium (Ti) | ≤ 0.02 |
⚙️ Mechanical Properties
| Property | Value |
|---|---|
| Yield Strength (ReH) | 390 - 530 MPa |
| Tensile Strength (Rm) | 510 - 660 MPa |
| Elongation (A5) | ≥ 20% |
| Impact Energy (KV at -40°C) | ≥ 27 J |
| Impact Energy (KV at -60°C) | ≥ 20 J |
| Brinell Hardness (HB) | 150 - 220 |
| Young's Modulus | 210 GPa |
| Poisson's Ratio | 0.30 |
| Fatigue Limit (107 cycles) | 180 - 220 MPa |
| Fracture Toughness (K1C) | 120 - 150 MPa·m1/2 |
🔬 Physical Properties
| Property | Value |
|---|---|
| Density | 7.85 g/cm³ |
| Melting Point | 1510 - 1540°C |
| Thermal Conductivity (20°C) | 52 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) | 0.15 µΩ·m |
| Magnetic Permeability | Ferromagnetic |
| Curie Temperature | 770°C |
| Thermal Diffusivity | 14.4 mm²/s |
| Emissivity (oxidized surface) | 0.79 |
📏 Product Specifications
| Specification | Details |
|---|---|
| Available Forms | Plates, Sheets, Bars, Forgings, Custom Shapes |
| Plate Thickness Range | 6 - 150 mm |
| Plate Width Range | 1000 - 4000 mm |
| Plate Length Range | 2000 - 18000 mm |
| Standards Compliance | EN 10225, API 2H, DNV GL, ABS, LR, BV |
| Surface Finish | Hot Rolled, Normalized, Shot Blasted, Pickled |
| Dimensional Tolerance | ±0.5mm thickness, ±5mm width/length |
| Flatness Tolerance | ≤ 5mm/m |
| Edge Condition | Mill Edge, Trimmed Edge, Flame Cut |
| Heat Treatment | Normalized (N), Normalized + Tempered (NT) |
| Testing Requirements | Impact Test, UT, MT, Chemical Analysis |
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Our Advantages in Processing EH40
Advanced Controlled Rolling Technology
MetalZenith employs precision controlled rolling processes with computer-controlled cooling systems to achieve optimal grain refinement and uniform mechanical properties throughout the steel thickness, ensuring consistent performance in demanding offshore environments.
Comprehensive Quality Testing Laboratory
Our state-of-the-art testing facility conducts extensive mechanical, chemical, and non-destructive testing including ultrasonic inspection, magnetic particle testing, and low-temperature Charpy impact testing to guarantee material integrity and compliance with international offshore standards.
Global Supply Chain & Custom Solutions
MetalZenith offers flexible supply solutions with strategic inventory locations worldwide, custom cutting and machining services, and technical support for project-specific requirements, ensuring timely delivery and optimal material utilization for offshore construction projects.
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