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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

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
nak 80 plastic mould steel

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