International Mold Steel Wire NAK-HH Precipitation Hardened Mold Steel Wire

International Mold Steel Wire NAK-HH Precipitation Hardened Mold Steel Wire Product Information -:- For detailed product information, please contact sales. -: International Mold Steel Wire NAK-HH Precipitation Hardened Mold Steel Wire Synonyms -:- For detailed product information, please contact sales. -:

International Mold Steel NAK-HH Precipitation Hardened Mold Steel Product Information -:- For detailed product information, please contact sales. -: **Product Introduction: NAK-HH Precipitation Hardened Stainless Mold Steel** --- ## **1. Overview** **NAK-HH** is a premium-grade, **precipitation-hardened (PH) stainless mold steel** developed by the International Mold Steel (IMS) group. It represents an advanced material solution specifically engineered for high-performance plastic injection molds and die-casting tooling requiring exceptional **corrosion resistance, high polishability, and excellent dimensional stability** after heat treatment. Unlike conventional quenched & tempered tool steels, NAK-HH attains its high hardness and strength through a low-temperature aging process that minimizes distortion. Its "HH" designation indicates "High Hardness" capability. This steel is particularly valued in manufacturing optical lenses, medical devices, and electronic components where superior surface finish and resistance to corrosive plastics are critical. --- ## **2. International Standards & Specifications** As a proprietary brand steel, NAK-HH is defined by the manufacturer's internal specifications. However, it corresponds to well-known international grades and is produced to meet the highest industry standards for mold steel. * **Primary Manufacturer Standard:** * **International Mold Steel (IMS) NAK-HH:** Proprietary specification defining chemistry, processing, and guaranteed properties. * **Key International Equivalents & Benchmarks:** * **AISI / UNS S42000 Modified (Premium Grade):** Falls within the martensitic stainless family but with optimized chemistry for PH hardening. * **DIN 1.2083 / 1.2085 (Enhanced):** Often compared to these popular German mold steels (e.g., 420 Stainless), but NAK-HH offers superior corrosion resistance and hardening mechanism. * **JIS SUS420J2 Modified:** Japanese stainless mold steel equivalent. * **Industry Benchmark:** It is designed to outperform standard P20 (1.2311) and 420 (1.2083) steels in corrosion resistance and polishability, competing with higher-end grades like **Stavax ESR (1.2083)** or **Corrax (1.6310 PH Steel)** in specific applications. --- ## **3. Chemical Composition (Weight %, Typical)** The composition is carefully balanced for hardness, corrosion resistance, and polishability. | Element | Typical Range (%) | Role & Benefit | | :--- | :--- | :--- | | **Carbon (C)** | 0.20 – 0.25 | Provides base hardness and wear resistance after heat treatment. | | **Chromium (Cr)** | 15.00 – 16.00 | **Primary alloy.** Ensures **excellent corrosion resistance** (superior to standard 420 grades) and contributes to hardness. | | **Nickel (Ni)** | 3.00 – 4.00 | **Key for PH hardening.** Enables the precipitation hardening mechanism, increases toughness, and aids in austenite stabilization. | | **Molybdenum (Mo)** | 0.80 – 1.20 | Enhances hardness, strength, and further improves corrosion resistance (especially pitting resistance). | | **Vanadium (V)** | 0.10 – 0.20 | Refines grain size, improves wear resistance, and contributes to secondary hardening during aging. | | **Manganese (Mn)** | 0.50 – 0.80 | Aids in deoxidation and improves hardenability. | | **Silicon (Si)** | 0.30 – 0.60 | Deoxidizer, improves fluidity and polishability. | | **Sulfur (S)** | ≤ 0.005 | **Very low.** Critical for achieving **excellent mirror polishability** (prevents sulfide inclusions). | --- ## **4. Typical Physical & Mechanical Properties** * **Heat Treatment Process:** 1. **Solution Annealing:** ~1020-1050°C, followed by rapid cooling (to achieve a soft, workable condition ~30 HRC). 2. **Machining & Fabrication:** Performed in the annealed state. 3. **Precipitation Hardening (Aging):** A single, low-temperature treatment (~480-520°C for several hours). This process induces hardening with **minimal distortion** (<0.05%) compared to conventional quenching. * **Final Hardness:** **40 - 52 HRC** (achievable via aging; specific hardness is customer-specified and controlled by aging parameters). * **Tensile Strength:** 1300 - 1650 MPa (189,000 - 239,000 psi) *[at ~48 HRC]* * **Yield Strength (0.2% Offset):** 1100 - 1400 MPa (160,000 - 203,000 psi) * **Elongation:** ~10-15% * **Density:** ~ 7.78 g/cm³ * **Thermal Conductivity:** ~ 25 W/m·K (at 20°C) * **Coefficient of Thermal Expansion:** ~ 10.5 x 10⁻⁶ /K (20-100°C) * **Corrosion Resistance:** **Excellent.** Far superior to standard P20 and 420 grades, resistant to moisture, many plastics (including PVC), and mild acids. * **Polishability:** **Exceptional (Mirror Finish).** Achieves very high surface finishes (e.g., #12000 grit diamond paste or better) due to its homogeneous, fine-grained structure and very low sulfur content. --- ## **5. Product Application** NAK-HH is specified for high-end, precision mold tools where surface quality and durability are paramount. * **Plastic Injection Molds:** * **Optical Components:** Lenses, light guides, reflectors. * **Medical Devices:** Syringes, implants, diagnostic equipment housings. * **Consumer Electronics:** High-gloss housings, transparent parts, connectors. * **Corrosive Plastics:** Molds for PVC, flame-retardant (FR) plastics, and acid-releasing materials. * **Die Casting:** Erosion inserts and cores for aluminum, magnesium, and zinc die-casting, where corrosion from coolants is an issue. * **General Precision Tooling:** Core pins, ejector pins, and mold inserts requiring high hardness and corrosion resistance. --- ## **6. Key Features & Advantages** * **Minimal Distortion Heat Treatment:** The low-temperature aging process drastically reduces the risk of warping and dimensional changes compared to traditional high-temperature quenching, saving time and cost on post-heat-treatment machining. * **Superior Corrosion Resistance:** High Chromium content provides excellent protection against rust and chemical attack from plastics and coolants, extending mold life and reducing maintenance. * **Outstanding Polishability & Texture Transfer:** Ultra-low sulfur and a fine, uniform microstructure allow for achieving flawless mirror finishes and perfect replication of fine textures (e.g., etch textures). * **Good Machinability & Weldability:** In the annealed condition, it machines relatively well. It can also be welded with proper procedures (using matching filler metals). * **High Uniformity & Purity:** Typically produced using advanced melting processes (like ESR - Electro Slag Remelting) to ensure exceptional cleanliness and isotropic properties. --- **In summary, International Mold Steel NAK-HH is a high-end, precipitation-hardening stainless mold steel designed for the most demanding tooling applications. Its primary value lies in its ability to achieve high hardness with minimal distortion, coupled with best-in-class corrosion resistance and polishability, making it an ideal choice for manufacturing precision, high-gloss, and corrosion-sensitive plastic and die-cast components.** -:- For detailed product information, please contact sales. -: International Mold Steel NAK-HH Precipitation Hardened Mold Steel Specification Dimensions Size： Diameter 20-1000 mm Length <7016 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 NAK-HH Precipitation Hardened Mold Steel Properties -:- For detailed product information, please contact sales. -:

Applications of International Mold Steel Wire NAK-HH Precipitation Hardened Mold Steel Wire -:- For detailed product information, please contact sales. -: Chemical Identifiers International Mold Steel Wire NAK-HH Precipitation Hardened Mold Steel Wire -:- For detailed product information, please contact sales. -:

Packing of International Mold Steel Wire NAK-HH Precipitation Hardened Mold Steel Wire -:- 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 Wire 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 3487 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