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Technical Specifications
Product Overview
Metallurgical Characteristics
JIS NAK80 is a precipitation-hardening mold steel featuring a martensitic matrix strengthened by intermetallic compounds of nickel-aluminum and copper-aluminum. The steel's unique composition provides exceptional dimensional stability during machining and service, with minimal distortion and excellent surface finish capabilities. The pre-hardened condition eliminates the need for post-machining heat treatment, reducing production time and maintaining tight tolerances.
Heat Treatment Process
MetalZenith's proprietary heat treatment process involves solution annealing at 900-950°C followed by controlled cooling and aging at 480-520°C for 4-8 hours. This precise thermal cycle ensures optimal precipitation of strengthening phases while maintaining excellent machinability. The pre-hardened condition achieves 37-43 HRC hardness with uniform distribution throughout the cross-section.
Manufacturing Process Excellence
Our advanced manufacturing process begins with vacuum induction melting (VIM) followed by electroslag remelting (ESR) to achieve superior cleanliness and homogeneity. Controlled forging and rolling operations ensure optimal grain structure and mechanical properties. MetalZenith's computer-controlled heat treatment facilities maintain precise temperature uniformity within ±5°C, ensuring consistent metallurgical properties.
Quality Standards & Testing
Every production lot undergoes comprehensive quality verification including chemical analysis by optical emission spectrometry, mechanical property testing, ultrasonic inspection for internal soundness, and dimensional verification. MetalZenith maintains full traceability from raw materials through final inspection, with certificates of compliance provided for all shipments. Our quality management system complies with ISO 9001:2015, AS9100D, and NADCAP requirements.
Machining & Processing Guidelines
NAK80's excellent machinability allows for high-speed cutting operations with carbide and HSS tooling. Recommended cutting speeds range from 80-150 m/min for roughing operations and 150-250 m/min for finishing. The steel's low work hardening tendency and good chip formation characteristics enable superior surface finishes up to mirror polish quality. Electrical discharge machining (EDM) and electrochemical machining (ECM) processes are highly effective for complex geometries.
🧪 Chemical Composition
| Element | Composition (%) |
|---|---|
| Carbon (C) | 0.10 - 0.15 |
| Silicon (Si) | 0.10 - 0.50 |
| Manganese (Mn) | 1.00 - 1.50 |
| Phosphorus (P) | ≤ 0.030 |
| Sulfur (S) | ≤ 0.030 |
| Chromium (Cr) | 0.50 - 1.00 |
| Nickel (Ni) | 2.75 - 3.25 |
| Molybdenum (Mo) | 0.15 - 0.25 |
| Aluminum (Al) | 0.95 - 1.35 |
| Copper (Cu) | 0.90 - 1.30 |
| Iron (Fe) | Balance |
⚙️ Mechanical Properties
| Property | Value |
|---|---|
| Hardness (Pre-hardened) | 37-43 HRC |
| Tensile Strength | 1275-1470 MPa |
| Yield Strength (0.2% offset) | ≥ 1080 MPa |
| Elongation | ≥ 10% |
| Reduction of Area | ≥ 35% |
| Impact Energy (Charpy V-notch) | ≥ 25 J |
| Young's Modulus | 210 GPa |
| Fatigue Limit (10&sup7; cycles) | 550 MPa |
| Poisson's Ratio | 0.27-0.30 |
🔬 Physical Properties
| Property | Value |
|---|---|
| Density | 7.80 g/cm³ |
| Melting Point | 1450-1500°C |
| Thermal Conductivity (20°C) | 29 W/m·K |
| Thermal Expansion Coefficient (20-100°C) | 11.5×10-6/K |
| Thermal Expansion Coefficient (20-200°C) | 12.2×10-6/K |
| Thermal Expansion Coefficient (20-400°C) | 13.1×10-6/K |
| Specific Heat Capacity | 460 J/kg·K |
| Electrical Resistivity | 0.45 µΩ·m |
| Magnetic Permeability | Ferromagnetic |
📏 Product Specifications
| Specification | Available Options |
|---|---|
| Product Forms | Round bars, flat bars, plates, blocks, forged pieces |
| Round Bar Diameter | 10-500 mm |
| Flat Bar Thickness | 10-200 mm |
| Plate Thickness | 15-300 mm |
| Maximum Length | 6000 mm |
| Standards Compliance | JIS G4404, ASTM A681, DIN 1.2767 |
| Surface Finish | Black, machined, polished, ground |
| Dimensional Tolerance | h9 to h11 (standard), h6 to h8 (precision) |
| Straightness | ≤ 1.0 mm/m |
| Surface Quality | Ra ≤ 3.2 µm (machined) |
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Our Advantages in Processing JIS NAK80
Advanced Vacuum Melting Technology
MetalZenith employs cutting-edge vacuum induction melting (VIM) and electroslag remelting (ESR) processes to achieve exceptional steel cleanliness and homogeneity. Our controlled atmosphere production eliminates inclusions and ensures consistent chemical composition throughout the entire steel billet, resulting in superior machinability and surface finish quality.
Precision Heat Treatment Control
Our computer-controlled heat treatment facilities feature advanced temperature monitoring and atmosphere control systems that ensure uniform hardness distribution and optimal precipitation hardening. MetalZenith's proprietary aging processes guarantee consistent mechanical properties and dimensional stability across all product dimensions.
Comprehensive Customization Services
MetalZenith offers extensive customization capabilities including precision machining, surface treatments, and dimensional tolerances tailored to specific mold requirements. Our global supply chain network ensures rapid delivery of custom sizes and specifications, supported by technical engineering consultation and application-specific material optimization.
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