NAK80

Other

NAK80

Prehardened plastic mold steel (Hitachi). Excellent mirror finish polishability, no distortion.

Chemical Composition (%)

C0.1
SI0.35
MN1.8
NI2.8
MO0.2
AL0.8
CU0.7
P0.03
S0.03

Mechanical Properties

Hardness:37-43 HRC (prehardened);Tensile:≥1180 MPa

Equivalent Grades

Hitachi NAK80 / NAK80

Applications

High-polish optical molds, cellphone shells, CD molds

Available Forms

Block,Plate

Uses

Carburizing (case-hardening) steel with low carbon core for toughness and a hard, wear-resistant surface after carburizing. Used for gears, camshafts, pinions, spline shafts, bushings and transmission parts subjected to fatigue and surface wear.

Heat Treatment

Typically normalized (880–920 °C, air cool) or carburized (900–930 °C) for case-hardening grades, then quenched and tempered at 150–200 °C. Carburize 900–930 °C, direct/intake quench, temper 150–200 °C; useful case depth 0.5–1.5 mm.

Precautions

Weldable with standard procedures; preheat may be needed for thick sections or higher-carbon/ alloy grades. Protect from decarburization during heating (controlled atmosphere or protective coating). Machine the core stock before surface hardening; leave grinding allowance for the hardened case.

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