NAK80 Pre-Hardened Plastic Mould Steel (E.S.R)

Type of steel and characteristics:
NAK80 is a precipitation hardening steel grade for plastic moulds, featuring good machinability in the as supplied, precipitation hardened condition.


  • High-precision plastic injection moulds e.g. for the production of camera parts and electronic parts,
  • Compression moulds for all types, e.g. for plastic container,
  • Moulds for the processing of elastomers,
  • Moulds for the production of packing rings (O-ring seals)
  • Moulds for the production of tire segments (rubber materials) and
  • High-precision components for mechanical engineering.

Premium NAK80 Steel Supplier In Malaysia

Special Steel proudly stands as the best specialty steel supplier in Malaysia, offering unrivaled quality in NAK80 Pre-Hardened Plastic Mould Steel (E.S.R). This steel grade, known for its exceptional machinability and precipitation hardening condition, caters to high-precision plastic injection moulds, compression moulds, elastomer processing, and more.

Our Unique Selling Proposition (USP) in delivering NAK80 steel is highlighted by over 30 years of industry leadership. Having served over 6000 customers across diverse sectors, our commitment to excellence is evident with a 96% client retention rate.

Choose Special Steel for a seamless blend of expertise, reliability, and an unmatched selection of specialty steels, ensuring immediate fulfillment of your specific needs.


Chemical Composition (%) C Si Mn Ni Cr Cu Al
0.13 0.30 2.0 3.50 0.35 1.20 1.20
Nearest Equivalent AISI P21 Mod


  • No heat treatment required in the precipitation hardened condition of supply
  • high hardness of up to 44 HRC after precipitation hardened
  • isotropic mechanical properties
  • good machinability in the precipitation hardened condition of supply
  • excellent electrical discharge machinability
  • excellent polishability
  • excellent weldability
  • suited for gas and bath nitriding treatments serving to improve surface wear resistance; no hardness decrease during bath nitriding thanks to high retention of hardness at temperatures up to 570°C (low over ageing tendency); in the solution annealed condition, nitriding and precipitation hardening can be carried out in one step
  • suited for chromium plating and for any other type of surface coating
  • simple heat treatment in the solution annealed condition of supply (for order please inquire)
  • minimum dimensional changes during precipitation hardening

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