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Technical Specifications
Product Overview
Metallurgical Characteristics
GB L450 steel features a fine-grained ferrite-pearlite microstructure achieved through controlled rolling and accelerated cooling processes. The optimized chemical composition with microalloying elements (Nb, V, Ti) provides excellent strength-toughness balance and superior weldability. The steel exhibits exceptional resistance to hydrogen-induced cracking (HIC) and stress corrosion cracking (SCC).
Manufacturing Process
MetalZenith employs advanced steelmaking technology including electric arc furnace melting, ladle refining, and continuous casting. The TMCP (Thermo-Mechanical Controlled Processing) involves controlled rolling at temperatures between 850-950°C followed by accelerated cooling to achieve optimal grain refinement and precipitation strengthening. Post-rolling heat treatment may include normalizing at 900-950°C for enhanced mechanical properties.
Heat Treatment Options
Standard delivery condition is as-rolled or normalized. Optional heat treatments include stress relieving at 580-650°C, quenching and tempering for enhanced strength, and controlled cooling for improved toughness. Welding preheat temperature ranges from 50-150°C depending on thickness and ambient conditions.
Quality Standards & Testing
Comprehensive quality control includes chemical analysis by optical emission spectrometry, mechanical testing per GB/T 228 and GB/T 229, ultrasonic testing for internal soundness, and dimensional inspection. Third-party certification available from Lloyd's Register, DNV GL, and other recognized classification societies. Full material traceability and mill test certificates provided with each shipment.
🧪 Chemical Composition
| Element | Composition (%) |
|---|---|
| Carbon (C) | ≤ 0.16 |
| Manganese (Mn) | 1.40 - 1.65 |
| Silicon (Si) | 0.15 - 0.45 |
| Phosphorus (P) | ≤ 0.025 |
| Sulfur (S) | ≤ 0.015 |
| Chromium (Cr) | ≤ 0.30 |
| Nickel (Ni) | ≤ 0.30 |
| Molybdenum (Mo) | ≤ 0.25 |
| Copper (Cu) | ≤ 0.35 |
| Niobium (Nb) | 0.02 - 0.10 |
| Vanadium (V) | ≤ 0.06 |
| Titanium (Ti) | ≤ 0.04 |
| Aluminum (Al) | ≥ 0.015 |
| Nitrogen (N) | ≤ 0.012 |
⚙️ Mechanical Properties
| Property | Value |
|---|---|
| Yield Strength (Rt0.5) | 450 - 570 MPa |
| Tensile Strength (Rm) | 535 - 760 MPa |
| Elongation (A) | ≥ 21% |
| Yield to Tensile Ratio | ≤ 0.85 |
| Hardness (HV10) | 200 - 280 |
| Impact Energy (KV2) at 0°C | ≥ 150 J |
| Impact Energy (KV2) at -20°C | ≥ 120 J |
| Impact Energy (KV2) at -40°C | ≥ 80 J |
| Fatigue Limit (10^7 cycles) | 240 MPa |
| Fracture Toughness (KIC) | 180 MPa·m^0.5 |
| Young's Modulus | 210 GPa |
| Poisson's Ratio | 0.30 |
🔬 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, Coils, Pipes, Tubes, Bars |
| Plate Thickness | 6 - 100 mm |
| Sheet Thickness | 1.5 - 6 mm |
| Coil Thickness | 2 - 25 mm |
| Width Range | 1000 - 4000 mm |
| Length Range | 2000 - 18000 mm |
| Pipe Diameter | 219 - 1422 mm |
| Pipe Wall Thickness | 6 - 80 mm |
| Standards Compliance | GB/T 9711, API 5L, ISO 3183, EN 10208 |
| Surface Finish | Hot Rolled, Normalized, TMCP |
| Dimensional Tolerance | ±0.5% (thickness), ±5mm (width/length) |
| Edge Condition | Mill Edge, Slit Edge, Trimmed Edge |
| Testing Standards | GB/T 228, GB/T 229, GB/T 232, ASTM A370 |
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Our Advantages in Processing GB L450
Advanced TMCP Technology
MetalZenith employs cutting-edge Thermo-Mechanical Controlled Processing (TMCP) with precise temperature control and accelerated cooling systems, achieving optimal grain refinement and enhanced mechanical properties while maintaining excellent weldability characteristics.
Comprehensive Quality Control
Our integrated quality management system features advanced ultrasonic testing, automated chemical analysis, and real-time mechanical property monitoring. Every coil and plate undergoes 100% inspection with full traceability documentation and third-party certification.
Flexible Customization Capabilities
MetalZenith offers extensive customization options including specific dimensional tolerances, surface finishes, and mechanical property requirements. Our global supply chain ensures reliable delivery with just-in-time logistics and comprehensive technical support services.
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