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Technical Specifications
Product Overview
Metallurgical Characteristics
N690 is a high-strength low-alloy (HSLA) structural steel with a tempered martensitic microstructure achieved through controlled quenching and tempering processes. The optimized alloy composition with chromium, nickel, and molybdenum additions provides enhanced hardenability and improved mechanical properties. The fine-grained microstructure ensures excellent strength-to-weight ratio and superior impact toughness for structural applications.
Heat Treatment Process
MetalZenith employs controlled austenitizing at 880-920°C followed by water or oil quenching to achieve martensitic transformation. Subsequent tempering at 580-650°C optimizes the balance between strength and toughness. Our precise temperature control and cooling rate management ensure consistent mechanical properties and dimensional stability throughout the material cross-section.
Manufacturing Process Excellence
Our advanced manufacturing process includes electric arc furnace melting with secondary refining, continuous casting, and controlled rolling to achieve optimal grain structure. MetalZenith's integrated quality management system ensures traceability from raw materials through final inspection, with real-time monitoring of critical process parameters.
Specialized Quality Testing
N690 steel undergoes comprehensive testing protocols including weldability assessment using standardized procedures, formability evaluation through bend testing and deep drawing analysis, fatigue strength testing under cyclic loading conditions, and atmospheric corrosion resistance evaluation. Our testing laboratory maintains ASTM and ISO certifications for accurate and reliable results.
Structural Application Engineering
For building construction applications, N690 provides excellent seismic resistance and load-bearing capacity. In bridge engineering, the superior fatigue resistance ensures long-term structural integrity under dynamic loading. For machinery manufacturing, the combination of high strength and good machinability enables complex component fabrication. Vehicle manufacturing benefits from the excellent crash energy absorption characteristics, while general engineering applications leverage the versatile processing capabilities and reliable performance under various service conditions.
🧪 Chemical Composition
| Element | Composition (%) |
|---|---|
| Carbon (C) | 0.15 - 0.22 |
| Manganese (Mn) | 1.20 - 1.60 |
| Silicon (Si) | 0.20 - 0.60 |
| Phosphorus (P) | ≤ 0.030 |
| Sulfur (S) | ≤ 0.025 |
| Chromium (Cr) | 0.40 - 0.80 |
| Nickel (Ni) | 0.30 - 0.70 |
| Molybdenum (Mo) | 0.15 - 0.30 |
⚙️ Mechanical Properties
| Property | Value |
|---|---|
| Yield Strength (MPa) | ≥ 690 |
| Tensile Strength (MPa) | 750 - 950 |
| Elongation (%) | ≥ 14 |
| Impact Energy at -20°C (J) | ≥ 40 |
| Hardness (HB) | 220 - 280 |
| Fatigue Strength (MPa) | ≥ 350 |
🔬 Physical Properties
| Property | Value |
|---|---|
| Density (g/cm3) | 7.85 |
| Melting Point (°C) | 1480 - 1520 |
| Thermal Conductivity (W/m·K) | 42.5 |
| Thermal Expansion (×10??/K) | 11.8 |
| Elastic Modulus (GPa) | 210 |
| Poisson's Ratio | 0.30 |
📏 Product Specifications
| Specification | Details |
|---|---|
| Available Forms | Plates, Sheets, Beams, Channels, Angles, Bars |
| Thickness Range | 8 - 150mm |
| Width Range | 1200 - 3500mm |
| Length Range | 6000 - 15000mm |
| Standards Compliance | ASTM A514, EN 10025-6, JIS G3106 |
| Heat Treatment Condition | Quenched and Tempered (Q&T) |
| Surface Finish | Hot Rolled, Pickled, Shot Blasted |
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Our Advantages in Processing N690 Steel
Advanced Thermomechanical Processing
MetalZenith utilizes controlled rolling followed by precise quenching and tempering processes with real-time monitoring to achieve optimal microstructure and mechanical properties. Our advanced processing technology ensures uniform strength distribution and enhanced toughness throughout the material cross-section, critical for structural integrity.
Comprehensive Structural Performance Testing
Our N690 steel undergoes extensive testing protocols including weldability assessment, formability evaluation, fatigue strength testing, and atmospheric corrosion resistance analysis. MetalZenith's quality assurance program ensures superior performance in structural applications with comprehensive documentation for engineering specifications.
Custom Structural Solutions & Engineering Support
MetalZenith provides tailored processing services including custom heat treatment, precision cutting, and forming operations. Our technical team offers comprehensive engineering support for structural design optimization, material selection guidance, and application-specific processing recommendations to meet unique project requirements.
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