NAK80 | P21 | 1.2796
NAK80 (Comparable to P21 / 1.2796) is a pre-hardened plastic mold steel, excellent mirror polishing performance, and good machinability. It provides uniform hardness, good toughness, and excellent EDM surface quality, making it particularly suitable for precision plastic molds requiring high-quality surface finishes.
Available Form
Round Bar
Custom Diameter & Length
Flat Bar
Custom Thickness, Width & Length
Square Bar
Custom Width & Length
Steel Plate
Custom Thickness, Width & Length
Steel Grade Comparison
| W-Nr | EN | AISI | JIS |
| 1.2796 | – | P21 | – |
Chemical Composition(wt%)
| C | Si | Mn | Ni | Cu | Mo | Al |
| 0.10~0.20 | ≤0.40 | 1.40~2.00 | 2.90~3.40 | 0.80~1.20 | 0.20~0.50 | 0.70~1.20 |
Physical Properties
Thermal Conductivity: 29.5 W/(m.K) at 25°C
| Temperature | 20-100°C | 2-200°C | 2-300°C |
| Coefficient of Thermal Expansion(×10-6 /K) | 11.3 | 12.5 | 13.4 |
Heat Treatment Process
Stress Relieving: Heat the steel to 500~550°C, hold well, then cool slowly inside the furnace.
Nitriding: Heat to 450~520°C for surface hardening, then allow it to cool in still air.
Application Fields
Used for mirror-polished molds, dust covers, television filter panels, and cosmetic cases; molds for precision thread machining, office automation equipment, and automotive parts; as well as molds for electrical discharge machining
Disclaimer: the information and data presented herein are typical values for reference and are not intended as warranties to readers.
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