International Mold Steel Sheet,Plate NAK80 Precipitation Hardened Mold Steel Sheet,Plate

International Mold Steel Sheet/Plate NAK80 Precipitation Hardened Mold Steel Sheet/Plate Product Information -:- For detailed product information, please contact sales. -: International Mold Steel Sheet/Plate NAK80 Precipitation Hardened Mold Steel Sheet/Plate Synonyms -:- For detailed product information, please contact sales. -:

International Mold Steel NAK80 Precipitation Hardened Mold Steel Product Information -:- For detailed product information, please contact sales. -: # **Product Introduction: International Mold Steel NAK80 Precipitation Hardened Mold Steel** International Mold Steel (IMS) NAK80 is a premium, nickel-aluminum (Ni-Al) precipitation hardening mold steel supplied in a pre-hardened, pre-aged condition. It is renowned for its **exceptional combination of high hardness (37-43 HRC), outstanding polishability, excellent dimensional stability, and very good machinability**. As a member of the "NAK" series, NAK80 achieves its hardness through the formation of fine intermetallic Ni₃Al precipitates during aging, rather than traditional martensitic quenching, resulting in minimal distortion and superb isotropic properties. Specifically engineered for **high-precision, long-run plastic injection molds**, NAK80 is the material of choice for applications demanding flawless surface finishes, such as optical components, lenses, and high-gloss consumer parts. Its unique metallurgy allows it to be directly machined, polished, and textured in its hard state, streamlining the mold-making process by eliminating post-machining heat treatment risks. NAK80 represents a benchmark for mold steels where surface quality, precision, and manufacturing efficiency are paramount. --- ## **1. Chemical Composition (Weight %)** NAK80 features a nickel-aluminum hardening system with added sulfur for machinability and chromium for corrosion resistance/hardenability. | **Element** | **Nickel (Ni)** | **Aluminum (Al)** | **Copper (Cu)** | **Molybdenum (Mo)** | **Chromium (Cr)** | **Manganese (Mn)** | **Sulfur (S)** | | :--- | :--- | :--- | :--- | :--- | :--- | :--- | :--- | | **Content** | **2.80 - 3.50** | **0.70 - 1.20** | **0.80 - 1.30** | **0.20 - 0.50** | **0.80 - 1.30** | **1.30 - 1.80** | **0.05 - 0.12** | | **Role** | **Primary hardening element.** Forms the hardening precipitate Ni₃Al (gamma prime phase) with Aluminum during aging, providing strength and hardness. | Partners with Nickel to form the age-hardening Ni₃Al precipitates. | Contributes to age hardening and improves corrosion resistance. | Increases strength, refines grain structure, and improves hardenability. | Enhances hardenability during solution treatment and provides mild corrosion resistance. | Combines with Sulfur to form MnS inclusions, crucial for **exceptional free-machining characteristics**. Also aids in deoxidation. | Forms manganese sulfide (MnS) inclusions that act as chip breakers, granting superior machinability in the hardened state. | *Note: Iron (Fe) constitutes the remainder. Carbon (C) is kept very low (<0.15%), which is key to its non-martensitic hardening and excellent polishability.* --- ## **2. Physical & Mechanical Properties** *Supplied in a solution-treated and pre-aged condition with a uniform hardness of 37-43 HRC (typically ~40 HRC).* * **Density:** ~7.8 g/cm³ * **Modulus of Elasticity:** ~190-200 GPa * **Thermal Conductivity:** Moderate. * **As-Supplied Hardness:** **37 - 43 HRC** (Typically **39-41 HRC**). Ready for immediate machining. * **Machinability:** **Excellent.** One of its standout features. It machines with ease, producing short, broken chips and yielding very good surface finishes directly from the mill, reducing tool wear and machining time significantly. * **Polishability:** **Superb.** Capable of achieving ultra-high mirror finishes (e.g., SPI-A1, #12000+ grit). Its fine, uniform, non-directional microstructure, free of large hard carbides, allows for flawless polishing. * **Photographic Etchability (Texturing):** **Excellent.** Produces sharp, consistent, and highly detailed textures with excellent definition. * **Dimensional Stability:** **Exceptional.** No phase transformation occurs during final aging or under typical molding temperatures (<300°C/570°F), ensuring virtually no movement after machining. * **Toughness:** **Good.** Adequate for the vast majority of plastic injection molding applications, including those with complex cores and slides. * **Weldability:** Fair to good with proper procedure (pre-heat, specific electrodes like NC-310). Weld repairs are feasible but require care. --- ## **3. Processing & Thermal Treatment** NAK80 follows a specific thermal cycle set by the mill; the mold maker primarily performs machining and finishing. 1. **Mill Processing:** The steel undergoes **Solution Treatment** (heated to dissolve alloying elements) followed by quenching and a **Pre-Aging** process. It is supplied in this hardened, stabilized condition. 2. **Machining (User):** The mold maker machines the steel directly in its hard state (40 HRC). No customer annealing or hardening is required or possible. 3. **Aging (Optional - User):** After machining, a low-temperature **Final Aging Treatment** (~480-520°C / 900-970°F for several hours) is often performed. This relieves machining stresses, slightly increases hardness (by 1-3 HRC), and maximizes dimensional stability for high-precision molds. 4. **Finishing:** Excellent response to polishing, texturing (EDM, laser, chemical), and coatings (e.g., nickel plating, DLC). 5. **Nitriding:** Can be nitrided to increase surface hardness to 65-70 HV for improved wear and anti-sticking properties when molding abrasive filled plastics. --- ## **4. Key Applications** NAK80 is the industry standard for high-end, precision plastic injection molds requiring perfect surfaces and stability. * **Optical Molds:** For lenses, light guides, reflectors, prisms, and display components. * **High-Gloss & Appearance Parts Molds:** For automotive interiors (dashboards, trim), consumer electronics (phone/computer housings, bezels), and appliances. * **Molds for Engineering Plastics:** Including ABS, PC, PC/ABS, PMMA, POM, and nylon (unfilled or mildly filled). * **Molds for Clear Parts:** Where internal polish and clarity are critical. * **Large, Complex Cavity & Core Inserts** where machining in a pre-hardened state reduces risk and ensures accuracy. --- ## **5. International Standards & Cross-References** NAK80 is a Japanese-origin, proprietary grade that has become a global industry benchmark. It is part of the "NAK" series of precipitation-hardening mold steels. * **JIS:** No official JIS designation. It is a proprietary trade name. * **AISI/SAE:** No direct equivalent. Functionally similar in application to pre-hardened mold steels like P20, but with a different hardening mechanism and superior polishability. * **European (EN):** No direct equivalent. The closest in concept are special Ni-Al age-hardening steels. * **Common Trade Names/Equivalents:** * **Daido NAK80** (the original manufacturer's grade). * **Hitachi HPM75** (similar Ni-Al age-hardening steel). * **Uddeholm Unimax** (Different chemistry, but similar pre-hardened, high-polish application). * **Böhler M333 (Isodur 333)**. * **Thyssenkrupp GS-312**. * **Assab 718 (similar application, but different metallurgy - martensitic hardening).** --- ## **6. Advantages & Limitations** **Advantages:** * **Superb Polishability & Texture Reproduction:** Delivers the highest possible surface quality for optical and aesthetic parts. * **Excellent Machinability in Hard State:** Allows for fast, efficient machining of complex shapes at ~40 HRC. * **Unmatched Dimensional Stability:** Eliminates risks of distortion from post-machining heat treatment. * **Good Overall Performance:** Balanced hardness, toughness, and wear resistance for high-volume molding. * **Proven Industry Standard:** Decades of successful use in the most demanding mold applications. **Limitations:** * **Lower Hardness than Tool Steels:** Not suitable for applications requiring core hardness above ~43 HRC or for severe abrasive wear without surface treatment. * **Moderate Wear Resistance vs. Tool Steels:** Requires nitriding for molding highly abrasive, glass-filled plastics. * **Not for High-Temperature Molding:** Limited to standard plastic injection molding temperatures. * **Higher Cost:** More expensive than standard pre-hardened steels like P20 or 420 stainless. * **Limited Weldability:** Requires expertise and specific procedures for successful repairs. --- ## **7. Summary** **International Mold Steel NAK80 is the definitive choice for mold makers and designers who cannot compromise on surface finish, precision, or manufacturing predictability.** Its precipitation-hardening technology provides a unique set of properties: the ability to be machined like a softer steel while possessing the hardness and polishability of a far harder one, all with exceptional dimensional stability. By enabling the production of flawless, high-precision molds directly from a pre-hardened block, NAK80 reduces lead times, eliminates heat treatment risks, and guarantees the highest quality for molded plastic parts. It remains the undisputed material of choice for the optical, automotive, and high-end consumer electronics industries, where perfection is not just desired—it is required. -:- For detailed product information, please contact sales. -: International Mold Steel NAK80 Precipitation Hardened Mold Steel Specification Dimensions Size： Diameter 20-1000 mm Length <7009 mm Size:We can customized as required Standard： Per your request or drawing We can customized as required Properties（Theoretical） Chemical Composition -:- For detailed product information, please contact sales. -: International Mold Steel NAK80 Precipitation Hardened Mold Steel Properties -:- For detailed product information, please contact sales. -:

Applications of International Mold Steel Sheet,Plate NAK80 Precipitation Hardened Mold Steel Sheet,Plate -:- For detailed product information, please contact sales. -: Chemical Identifiers International Mold Steel Sheet,Plate NAK80 Precipitation Hardened Mold Steel Sheet,Plate -:- For detailed product information, please contact sales. -:

Packing of International Mold Steel Sheet/Plate NAK80 Precipitation Hardened Mold Steel Sheet/Plate -:- For detailed product information, please contact sales. -: Standard Packing: -:- For detailed product information, please contact sales. -: Typical bulk packaging includes palletized plastic 5 gallon/25 kg. pails, fiber and Steel Sheet/Plate drums to 1 ton super sacks in full container (FCL) or truck load (T/L) quantities. Research and sample quantities and hygroscopic, oxidizing or other air sensitive materials may be packaged under argon or vacuum. Solutions are packaged in polypropylene, plastic or glass jars up to palletized 3480 gallon liquid totes Special package is available on request. E FORUs’ is carefully handled to minimize damage during storage and transportation and to preserve the quality of our products in their original condition