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Technical Specifications
Product Overview
Metallurgical Characteristics
X70 is a high-strength low-alloy (HSLA) structural steel featuring a fine-grained ferritic-bainitic microstructure achieved through controlled thermomechanical processing. The strategic addition of microalloying elements including niobium, vanadium, and titanium promotes precipitation strengthening and grain refinement, resulting in exceptional strength-to-weight ratio and superior structural performance.
Heat Treatment Process
MetalZenith employs advanced thermomechanical controlled processing (TMCP) with controlled rolling temperatures between 850-950°C followed by accelerated cooling. This process optimizes the austenite-to-ferrite transformation, ensuring uniform microstructure and enhanced mechanical properties essential for structural applications.
Manufacturing Excellence
Our state-of-the-art production facilities utilize computer-controlled rolling mills with precise temperature monitoring and cooling systems. The manufacturing process includes continuous casting, controlled reheating, multi-pass rolling with strain accumulation, and accelerated cooling to achieve optimal grain structure and mechanical properties.
Structural Quality Testing
MetalZenith conducts comprehensive testing protocols specifically designed for structural applications, including welding performance evaluation using standard procedures, forming capability assessment through bend testing, fatigue strength testing under cyclic loading conditions, and atmospheric corrosion resistance testing to ensure long-term durability in outdoor structural environments.
Engineering Applications
X70 steel is engineered for critical structural applications requiring high strength and reliability. In building construction, it provides excellent load-bearing capacity for high-rise frameworks. For bridge engineering, its superior fatigue resistance ensures long-term structural integrity under dynamic loading. In machinery manufacturing, the combination of strength and formability enables complex component fabrication. Vehicle manufacturing benefits from its lightweight strength characteristics, while general engineering applications leverage its versatile mechanical properties and excellent weldability.
🧪 Chemical Composition
| Element | Composition (%) |
|---|---|
| Carbon (C) | ≤ 0.16 |
| Manganese (Mn) | 1.40 - 1.70 |
| Silicon (Si) | 0.15 - 0.45 |
| Phosphorus (P) | ≤ 0.020 |
| Sulfur (S) | ≤ 0.010 |
| Niobium (Nb) | 0.040 - 0.080 |
| Vanadium (V) | 0.030 - 0.080 |
| Titanium (Ti) | 0.010 - 0.040 |
⚙️ Mechanical Properties
| Property | Value |
|---|---|
| Yield Strength (MPa) | ≥ 485 |
| Tensile Strength (MPa) | 570 - 760 |
| Elongation (%) | ≥ 18 |
| Impact Energy at -20°C (J) | ≥ 40 |
| Hardness (HB) | 180 - 230 |
| Fatigue Strength (MPa) | ≥ 240 |
🔬 Physical Properties
| Property | Value |
|---|---|
| Density (g/cm3) | 7.85 |
| Melting Point (°C) | 1510 - 1540 |
| Thermal Conductivity (W/m·K) | 48.2 |
| Thermal Expansion (×10??/K) | 11.8 |
| Elastic Modulus (GPa) | 207 |
| Poisson's Ratio | 0.30 |
📏 Product Specifications
| Specification | Details |
|---|---|
| Available Forms | Plates, Sheets, Beams, Pipes, Structural Sections |
| Thickness Range | 8 - 80mm |
| Width Range | 1200 - 3800mm |
| Length Range | 6000 - 15000mm |
| Standards Compliance | API 5L X70, ASTM A572 Grade 65, EN 10208-2 |
| Heat Treatment Condition | TMCP (As-Rolled) or Normalized |
| Surface Finish | Hot Rolled, Pickled, Shot Blasted |
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Our Advantages in Processing X70 Steel
Advanced Thermomechanical Processing
MetalZenith utilizes cutting-edge TMCP technology with precise temperature control and accelerated cooling to achieve optimal microstructure refinement. Our controlled rolling process ensures consistent mechanical properties and enhanced structural performance throughout the material cross-section.
Comprehensive Structural Testing
Our X70 steel undergoes extensive testing protocols including welding performance evaluation, forming capability assessment, fatigue strength testing, and atmospheric corrosion resistance analysis. This ensures superior performance in demanding structural applications with long-term reliability.
Custom Structural Solutions
MetalZenith provides tailored processing services including precision cutting, forming, heat treatment, and surface preparation. Our technical support team works closely with structural engineers to optimize material specifications for specific building, bridge, and machinery applications.
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