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Introduction
NAK-80 is a pre-Hardened, high performance, high precision, mold steel. Applications include plastic molds, rubber molds, jigs & fixtures, and press dies.
Smelting method : EAF+LF+VD+ESR
Main Characteristics : High monitoring performance even hardness, excellent discharging processing performance and texture processing performance. Molds can be used upon processing and no heat treatment is required.
Major Applications : Mirror plastic molds: Transparent plastic molds: optical instrument parts, compact disks, medical devices etc.
Molds underlining discharging processing surface quality.
Chemical Composition : (%)
| C | Si | Mn | Cu |
| 0.15 | ≤ 0.45 | 1.55 | 1.0 |
| Mo | Ni | Ai | P | S |
| 0.3 | 0.22 | 0.3 | ≤ 0.03 | ≤ 0.015 |
Physical Property : (%)
| Room temperature density (kg/m³) | Specific heat of room temperature (J/Kg.K) | 200°C thermal conductivity (W/m.K) |
| 7.8 | 460 | 22 |
| Elastic mouldsus (N/nm²) | Linear Expensivity (x10-6K) 20 ~ 200°C
20 ~ 400°C
|
| 218,000 |
12.3
13.2
|
Ultrasonic flaw detection :
Flaw detection standard: as per GB/T 6402-2008 Class 4 flaw detection standard or as per customer requirements.
Purity :
| Class A | Class B | ||
| Fine | Coarse | Fine | Coarse |
| 0.5 | 0.5 | 1.0 | 1.0 |
| Class C | Class D | ||
| Fine | Coarse | Fine | Coarse |
| 1.0 | 1.0 | 1.5 | 1.0 |
Delivery State :
(1) Delivery under pre-hardening state, delivery hardness 38~42HRC.
Supply Specifications :
| Flat Steel | Module |
| 16~120mm x 200~810mm | 120~400mm x 300~800mm |
Heat Treatments :
| Softening annealing | Quenching | Tempering |
| Heating to 760°C for heat insulation and cooling to 600°C at 40°C/h | Delivery under pre-hardening state, no heat treatment, temperature of nitridation treatment 520°C | |
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