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Technical Specifications
Product Overview
Metallurgical Characteristics
Grade 8 steel features a tempered martensitic microstructure achieved through controlled quenching and tempering processes. The optimized alloy composition with chromium, molybdenum, and boron additions provides exceptional hardenability and strength while maintaining good toughness and weldability for structural applications.
Heat Treatment Process
MetalZenith employs controlled austenitizing at 900-930°C followed by water quenching and tempering at 620-680°C. This precise heat treatment cycle ensures optimal strength-toughness balance and stress relief, critical for structural performance and dimensional stability.
Manufacturing Excellence
Our advanced manufacturing process includes vacuum degassing, controlled rolling, and precision heat treatment with computerized temperature control. Quality assurance includes ultrasonic testing, magnetic particle inspection, and comprehensive mechanical testing to ensure structural integrity.
Specialized Testing Protocols
Grade 8 steel undergoes extensive welding performance testing including prequalified welding procedures, forming capability assessment through bend testing, fatigue strength evaluation under cyclic loading, and atmospheric corrosion resistance testing for long-term durability in structural environments.
Structural Application Engineering
For building construction, our Grade 8 steel provides superior load-bearing capacity and seismic resistance. In bridge engineering, the high strength-to-weight ratio enables longer spans and reduced material usage. For machinery manufacturing, the excellent fatigue resistance ensures reliable performance under dynamic loading. In vehicle manufacturing, the combination of strength and formability allows for lightweight yet robust chassis designs.
🧪 Chemical Composition
| Element | Composition (%) |
|---|---|
| Carbon (C) | 0.15 - 0.21 |
| Manganese (Mn) | 0.80 - 1.10 |
| Silicon (Si) | 0.20 - 0.35 |
| Phosphorus (P) | ≤ 0.035 |
| Sulfur (S) | ≤ 0.035 |
| Chromium (Cr) | 0.40 - 0.65 |
| Molybdenum (Mo) | 0.15 - 0.25 |
| Boron (B) | 0.0005 - 0.006 |
⚙️ Mechanical Properties
| Property | Value |
|---|---|
| Yield Strength (MPa) | ≥ 690 |
| Tensile Strength (MPa) | 760 - 895 |
| Elongation (%) | ≥ 18 |
| Impact Energy at 0°C (J) | ≥ 34 |
| Hardness (HB) | 235 - 285 |
| Fatigue Strength (MPa) | 380 - 420 |
🔬 Physical Properties
| Property | Value |
|---|---|
| Density (g/cm3) | 7.85 |
| Melting Point (°C) | 1480 - 1520 |
| Thermal Conductivity (W/m·K) | 42.7 |
| Thermal Expansion (×10??/K) | 12.3 |
| Elastic Modulus (GPa) | 200 |
| Poisson's Ratio | 0.27 - 0.30 |
📏 Product Specifications
| Specification | Details |
|---|---|
| Available Forms | Plates, Beams, Channels, Angles, Bars, Custom Sections |
| Thickness Range | 6 - 150mm |
| Width Range | 1200 - 4200mm |
| Length Range | 6000 - 20000mm |
| Standards Compliance | ASTM A514, ASTM A709, AWS D1.1, EN 10025 |
| Heat Treatment Condition | Quenched and Tempered |
| Surface Finish | Hot Rolled, Shot Blasted, Pickled, Painted |
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Our Advantages in Processing Grade 8 Steel
Advanced Quenching & Tempering Process
MetalZenith employs precision-controlled quenching and tempering processes with real-time temperature monitoring to achieve optimal martensitic-tempered microstructure. Our advanced heat treatment ensures consistent high strength and toughness throughout the material cross-section, delivering superior performance in structural applications.
Comprehensive Structural Testing
Our Grade 8 steel undergoes rigorous testing protocols including welding performance evaluation, forming capability assessment, fatigue strength testing, and atmospheric corrosion resistance analysis. These specialized tests ensure optimal performance in structural applications where welding, forming, and long-term durability are critical.
Custom Structural Solutions
MetalZenith provides comprehensive custom processing services including precision cutting, forming, welding preparation, and surface treatment. Our technical support team works closely with structural engineers to optimize material specifications and processing parameters for specific construction and engineering applications.
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