NAK HH
Source: International Mold Steel, Inc.
NAK-HH is a precipitation, or age hardened mold steel with a through hardness of approximately 45/48 HRC
NAK-HH is a precipitation, or age hardened mold steel with a through hardness of approximately 45/48 HRC. NAK-HH is ideal for use in plastic, composite and rubber molds where impact resistance is not critical. It is vacuum-arc re-melted steel with uniform grain structure, uniform hardness and excellent dimensional stability.
Machines up to 30% faster than P20 to a superior surface with negligible dimensional change. Positive rake cutters with concave, chip-breaking inserts work best. EDMThe soft recast layer is much thinner and is easier to remove than steels with a recast layer that is equivalent to their "as quenched" hardness. With NAK-HH, no post EDM stress relieving is ever needed.
Age hardening eliminates the stresses inherent in quenched and tempered steels. NAK-HH is dimensionally stable and predictable over many years of heating and cooling cycles.
VAR processing with uniform grain structure facilitates superior nickel, chrome, titanium, and other coatings. Unique chemistry responds extremely well to ion-nitriding.
Exceptionally uniform grain structure allows for superior texturing and photo etching.
Higher hardness ensures molds have a longer life than those made from P20, or P20 High Hard particularly in gate, runner, and parting line areas.
UNIQUE CHARACTERISTICS
- Vacuum-Arc Re-melt manufacturing process.
- 45 HRC hardness.
- Uniform hardness throughout, even in heavy sections.
- Uniform grain structure with no pinholes, inclusions or hard spots.
- Machines up to 30% faster than 30 HRC P20 mold steels.
- Never needs stress relieving, even after heavy machining.
BENEFITS
- Machining
Machines up to 30% faster than P20 to a superior surface with negligible dimensional change. Positive rake cutters with concave, chip-breaking inserts work best. EDMThe soft recast layer is much thinner and is easier to remove than steels with a recast layer that is equivalent to their "as quenched" hardness. With NAK-HH, no post EDM stress relieving is ever needed.
- Stability
Age hardening eliminates the stresses inherent in quenched and tempered steels. NAK-HH is dimensionally stable and predictable over many years of heating and cooling cycles.
- Surface Enhancements
VAR processing with uniform grain structure facilitates superior nickel, chrome, titanium, and other coatings. Unique chemistry responds extremely well to ion-nitriding.
- Texturing and Polishing
Exceptionally uniform grain structure allows for superior texturing and photo etching.
- Wear
Higher hardness ensures molds have a longer life than those made from P20, or P20 High Hard particularly in gate, runner, and parting line areas.
MECHANICAL PROPERTIES
Tensile Strength (Mpa) …………………..……..……….1385 longitudinal, 1359 transverse
Yield Strength (.2% MPa) ……………….…..………….1031 longitudinal, 1009 transverse
Reduction of Area ……………………….......…………….22% longitudinal, 6% transverse
Elongation …………………………………..…….....…….11% longitudinal, 4 % transverse
Charpy U-notch Impact Strength (J/cm sq) ………..........…16 longitudinal, 11 transverse
Hardness …..............................................................................................…45 HRC
International Mold Steel, Inc., 6796 Powerline Drive, Florence, KY 41042. Tel: 859-342-6000; Fax: 859-342-6006.
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