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Technical Specifications
Product Overview
Metallurgical Characteristics
NAK55 features a tempered martensitic microstructure achieved through controlled quenching and tempering processes. The balanced alloy composition with chromium, molybdenum, and nickel provides excellent hardenability and toughness. The fine-grained structure ensures uniform mechanical properties and superior dimensional stability under structural loads.
Heat Treatment Process
MetalZenith employs precision heat treatment protocols including austenitizing at 850-870°C followed by controlled quenching and tempering at 550-600°C. This process optimizes the balance between strength and toughness while minimizing residual stresses critical for structural applications.
Manufacturing Excellence
Our advanced manufacturing process incorporates vacuum degassing, controlled rolling, and precision heat treatment to achieve exceptional material cleanliness and uniform properties. Real-time monitoring systems ensure consistent quality and traceability throughout production.
Structural Performance Testing
NAK55 undergoes comprehensive testing including welding performance evaluation using standard structural welding procedures, forming characteristic assessment through bend testing, fatigue strength verification under cyclic loading, and atmospheric corrosion resistance testing per ASTM standards.
Application Engineering
For building structures, NAK55 provides exceptional load-bearing capacity and seismic resistance. In bridge engineering, its fatigue resistance ensures long-term durability under dynamic loads. For machinery manufacturing, the pre-hardened condition eliminates post-machining heat treatment. In vehicle construction, it offers superior crash performance and weight optimization opportunities.
🧪 Chemical Composition
| Element | Composition (%) |
|---|---|
| Carbon (C) | 0.10 - 0.16 |
| Silicon (Si) | 0.10 - 0.40 |
| Manganese (Mn) | 1.30 - 1.60 |
| Phosphorus (P) | ≤ 0.030 |
| Sulfur (S) | ≤ 0.030 |
| Chromium (Cr) | 0.80 - 1.20 |
| Molybdenum (Mo) | 0.15 - 0.30 |
| Nickel (Ni) | 1.40 - 1.80 |
⚙️ Mechanical Properties
| Property | Value |
|---|---|
| Yield Strength (MPa) | ≥ 1000 |
| Tensile Strength (MPa) | 1150 - 1350 |
| Elongation (%) | ≥ 12 |
| Impact Energy at 20°C (J) | ≥ 40 |
| Hardness (HRC) | 36 - 42 |
| Fatigue Strength (MPa) | ≥ 450 |
🔬 Physical Properties
| Property | Value |
|---|---|
| Density (g/cm3) | 7.85 |
| Melting Point (°C) | 1420 - 1460 |
| Thermal Conductivity (W/m·K) | 42.7 |
| Thermal Expansion (×10??/K) | 11.5 |
| Elastic Modulus (GPa) | 210 |
| Poisson's Ratio | 0.27 - 0.30 |
📏 Product Specifications
| Specification | Details |
|---|---|
| Available Forms | Plates, Blocks, Bars, Forgings, Custom Shapes |
| Thickness Range | 10 - 300mm |
| Width Range | 100 - 2000mm |
| Length Range | 500 - 6000mm |
| Standards Compliance | JIS G4404, ASTM A514, EN 10083-3 |
| Heat Treatment Condition | Pre-hardened and Tempered |
| Surface Finish | Hot Rolled, Machined, Ground |
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Our Advantages in Processing NAK55
Advanced Vacuum Degassing Technology
MetalZenith utilizes cutting-edge vacuum degassing and controlled atmosphere melting to achieve exceptional steel cleanliness and uniform chemical composition. Our precision heat treatment process ensures optimal hardness distribution and stress relief, delivering consistent structural performance throughout the material cross-section.
Comprehensive Structural Performance Testing
Our NAK55 steel undergoes extensive testing protocols including welding performance evaluation, forming characteristic analysis, fatigue strength testing, and atmospheric corrosion resistance assessment. This comprehensive testing ensures superior performance in demanding structural applications across construction and industrial sectors.
Custom Structural Solutions & Engineering Support
MetalZenith provides tailored processing services including precision cutting, heat treatment optimization, and surface preparation specifically for structural applications. Our technical team offers comprehensive engineering support for structural design optimization and material selection guidance.
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