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Technical Specifications
Product Overview
Metallurgical Characteristics
FH40 is a normalized fine-grain structural steel with a predominantly ferritic-pearlitic microstructure. The controlled addition of microalloying elements such as niobium, vanadium, and titanium promotes grain refinement and precipitation strengthening, resulting in excellent strength-toughness combination essential for offshore applications.
Heat Treatment Process
MetalZenith employs controlled rolling followed by normalization at 900-950°C with controlled cooling rates to achieve optimal microstructural uniformity. The thermomechanical processing ensures fine austenite grain size and uniform carbide distribution, critical for achieving the required impact toughness at low service temperatures.
Manufacturing Process
Production begins with electric arc furnace melting followed by ladle refining and vacuum degassing to achieve ultra-low sulfur and phosphorus contents. Continuous casting produces high-quality billets which undergo controlled rolling with precise temperature control. Final normalization treatment ensures stress relief and optimal mechanical properties throughout the cross-section.
Quality Standards & Testing
Every heat undergoes comprehensive testing including chemical analysis, tensile testing, Charpy V-notch impact testing at -40°C and -60°C, hardness testing, and ultrasonic inspection. Microstructural examination ensures grain size compliance and absence of harmful inclusions. Third-party certification available from major classification societies including ABS, DNV-GL, Lloyd's Register, and Bureau Veritas.
Welding Considerations
FH40 exhibits excellent weldability with appropriate preheating (typically 100-150°C for thick sections) and controlled interpass temperatures. Low carbon equivalent (CEV ≤ 0.40) ensures minimal risk of cold cracking. Post-weld heat treatment may be required for stress relief in critical applications.
🧪 Chemical Composition
| Element | Composition (%) |
|---|---|
| Carbon (C) | ≤ 0.18 |
| Manganese (Mn) | 0.90 - 1.60 |
| Silicon (Si) | 0.10 - 0.50 |
| Phosphorus (P) | ≤ 0.030 |
| Sulfur (S) | ≤ 0.025 |
| Aluminum (Al) | ≥ 0.015 |
| Niobium (Nb) | 0.02 - 0.05 |
| Vanadium (V) | 0.05 - 0.10 |
| Titanium (Ti) | 0.02 - 0.05 |
| Nitrogen (N) | ≤ 0.012 |
| Copper (Cu) | ≤ 0.35 |
| Chromium (Cr) | ≤ 0.20 |
| Nickel (Ni) | ≤ 0.40 |
| Molybdenum (Mo) | ≤ 0.08 |
⚙️ Mechanical Properties
| Property | Value |
|---|---|
| Yield Strength (ReH) | 390 - 510 MPa |
| Tensile Strength (Rm) | 510 - 660 MPa |
| Elongation (A5) | ≥ 20% |
| Impact Energy (KV at -40°C) | ≥ 34 J |
| Impact Energy (KV at -60°C) | ≥ 24 J |
| Hardness (HB) | 150 - 220 |
| Young's Modulus | 206 GPa |
| Poisson's Ratio | 0.30 |
| Fatigue Limit (107 cycles) | 180 MPa |
| Fracture Toughness (K1C) | 120 MPa·m1/2 |
| Yield Ratio (ReH/Rm) | ≤ 0.80 |
🔬 Physical Properties
| Property | Value |
|---|---|
| Density | 7.85 g/cm³ |
| Melting Point | 1510°C |
| Thermal Conductivity (20°C) | 54 W/m·K |
| Thermal Expansion Coefficient (20-100°C) | 12×10-6/K |
| Specific Heat Capacity | 500 J/kg·K |
| Electrical Resistivity (20°C) | 0.16 µΩ·m |
| Magnetic Permeability | Ferromagnetic |
| Curie Temperature | 770°C |
| Thermal Diffusivity | 13.7 mm²/s |
| Coefficient of Linear Expansion (0-100°C) | 11.5×10-6/K |
📏 Product Specifications
| Specification | Details |
|---|---|
| Available Forms | Plates, Sheets, Bars, Sections, Forgings |
| Plate Thickness Range | 6 - 150 mm |
| Sheet Thickness Range | 3 - 12 mm |
| Width Range | 1000 - 4000 mm |
| Length Range | 2000 - 18000 mm |
| Standards Compliance | ABS, DNV-GL, LR, BV, NK, CCS, RINA |
| Surface Finish | Hot Rolled, Normalized, Shot Blasted |
| Edge Condition | Mill Edge, Sheared, Flame Cut, Machined |
| Thickness Tolerance | ±0.3 mm (6-40mm), ±0.5 mm (>40mm) |
| Width Tolerance | ±5 mm |
| Length Tolerance | ±10 mm |
| Flatness | ≤ 5 mm/m |
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Our Advantages in Processing FH40
Advanced Thermomechanical Processing
MetalZenith employs controlled rolling and precise normalization processes with real-time temperature monitoring to achieve optimal grain structure and enhanced mechanical properties. Our advanced processing ensures consistent toughness and strength throughout the material thickness.
Comprehensive Quality Testing
Our state-of-the-art testing facilities perform complete mechanical testing including Charpy V-notch impact tests at -40°C, ultrasonic inspection, and microstructural analysis. Every batch undergoes rigorous quality verification to meet offshore classification society standards.
Custom Offshore Solutions
MetalZenith offers tailored processing solutions including custom heat treatment, precision cutting, and specialized surface treatments. Our engineering team provides technical support for specific offshore applications with global logistics capabilities for timely delivery.
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