International Mold Steel Rod/Bar,Daido DRM2 Matrix High-Speed Steel Rod/Bar

International Mold Steel Rod Daido DRM2 Matrix High-Speed Steel Rod Product Information -:- For detailed product information, please contact sales. -: International Mold Steel Rod Daido DRM2 Matrix High-Speed Steel Rod Synonyms -:- For detailed product information, please contact sales. -:

International Mold Steel Daido DRM2 Matrix High-Speed Steel Product Information -:- For detailed product information, please contact sales. -: # **Product Introduction: Daido DRM2 (DEX40) Powder Metallurgy (PM) Matrix High-Speed Steel** ## **1. Overview** **Daido DRM2 (commercial name: DEX40)** is a **premium-grade, powder metallurgy (PM) processed, cobalt-alloyed matrix high-speed steel** engineered for the most demanding applications requiring the ultimate combination of **wear resistance, high-temperature hardness (red hardness), and strength**. As an enhanced variant of the DRM1 series, DRM2 incorporates a significant cobalt content, elevating its performance into the realm of **super high-speed steels**. It is specifically designed for tools and dies that operate under extreme conditions of abrasion, high pressure, and elevated temperatures where conventional tool steels fail prematurely. The PM manufacturing process ensures an **ultra-fine, homogeneous distribution of hard carbides** within a tough metallic matrix, delivering unparalleled consistency and isotropic properties for precision tooling applications. ## **2. International Standards & Specifications** DRM2 is a proprietary, high-performance PM steel from Daido Steel, designed to exceed the capabilities of standard high-speed steel classifications. * **Primary Manufacturer Standard:** * **Daido Steel DRM2 / DEX40:** Proprietary specification for this cobalt-containing powder metallurgy matrix steel. * **Material Classification & Comparative Grades:** * **Type:** **Cobalt-alloyed Powder Metallurgy High-Speed Steel (PM-HSS)**. * **Performance Benchmark:** Positioned as a superior alternative to premium conventional high-speed steels such as **AISI M42 (1.3247)** and **AISI M35 (1.3243)**, offering better toughness, grindability, and consistency due to its PM structure. * **International PM Steel Equivalents:** Occupies a similar performance tier as other top-tier cobalt-containing PM steels: * **Böhler S590 MICROCLEAN** (Austria) * **Uddeholm ASP 2060** (Sweden) * **ASSAB V-10** (Sweden) * **ISO 4957:** Would fall under alloy tool steel groups for high-speed applications, but is a specific proprietary PM grade. ## **3. Chemical Composition (Weight %, Typical)** The composition is optimized for maximum carbide volume and high-temperature stability through strategic additions of cobalt, tungsten, and vanadium. | Element | Typical Range (%) | Role & Benefit | | :--- | :--- | :--- | | **Carbon (C)** | 1.25 – 1.45 | Balanced to form a high volume of hard carbides while maintaining matrix integrity. Slightly lower than DRM1 to accommodate cobalt's effect on hardenability and toughness. | | **Chromium (Cr)** | 3.80 – 4.50 | Provides hardenability and contributes to general corrosion and wear resistance through chromium carbide formation. | | **Molybdenum (Mo)** | 4.50 – 5.50 | A primary alloying element. Enhances hardenability, refines grain structure, and contributes to secondary hardening and hot strength. | | **Tungsten (W)** | 9.00 – 10.00 | **High tungsten content** for exceptional **hot hardness (red hardness)** and wear resistance. Forms very stable tungsten carbides. | | **Vanadium (V)** | 3.00 – 4.00 | **Critical for abrasion resistance.** Forms extremely hard **vanadium carbides (VC)**. The PM process allows a high volume of these fine carbides without compromising structural integrity. | | **Cobalt (Co)** | 7.50 – 8.50 | **The key differentiator from DRM1.** Cobalt does not form carbides but **dissolves in the matrix**, significantly increasing **high-temperature strength, hot hardness, and tempering resistance**. It allows the steel to retain hardness at temperatures exceeding 600°C. | | **Matrix Composition:** The synergistic combination of fine, hard (W, V, Mo)C carbides in a Co-strengthened ferrous matrix delivers its world-class properties. ## **4. Typical Physical & Mechanical Properties (Heat Treated)** * **Recommended Heat Treatment:** * **Preheating:** 800-850°C (1470-1560°F) - **Crucial** due to high alloy content and risk of thermal shock. * **Austenitizing (Hardening):** 1180-1220°C (2155-2230°F). Precise temperature control is essential. * **Quenching:** Oil, high-pressure gas, or salt bath. * **Tempering:** **Triple tempering is mandatory.** Typical tempering range: 540-580°C (1000-1080°F). Exhibits a pronounced secondary hardening peak. * **Mechanical Properties (Hardened & Triple Tempered):** * **Hardness:** **66 – 68 HRC** (achievable and typical). Very high as-tempered hardness. * **Hot Hardness (Red Hardness):** **Exceptional.** Can retain over 60 HRC at temperatures above 600°C, a defining characteristic enabled by cobalt. * **Compressive Strength:** Extremely high (>3500 MPa), suitable for the most severe forming operations. * **Bending Strength:** Good for its extreme hardness level, but the material is optimized for wear/heat resistance rather than high impact loads. * **Impact Toughness:** Moderate. The high cobalt and carbide content prioritize wear and hot hardness over toughness. It is more brittle than DRM1 but offers comparable or better toughness than conventionally melted cobalt HSS grades (like M42) due to the fine PM structure. * **Abrasion Resistance:** **Outstanding.** Among the highest of all commercially available tool steels, due to the combined effect of high vanadium carbide content and a very hard matrix. * **Physical Properties:** * **Density:** ~8.3 g/cm³ * **Modulus of Elasticity:** ~210 GPa * **Thermal Conductivity:** Moderate, typical for high-alloy HSS. ## **5. Product Application** DRM2 is selected for the most severe applications where extreme wear, high pressure, and frictional heating are simultaneous challenges. * **High-Performance Cutting Tools (Limited):** * **Premium Cutting Inserts** for machining superalloys, hardened steels, and abrasive composites. * **Broaches** and **Gear Hobs** for difficult-to-machine materials. * **Severe Cold Work Applications:** * **Cold Extrusion Punches and Dies** for steel and high-strength alloys, where frictional heating is significant. * **Thread Rolling Dies** for hard materials. * **Fine Blanking Punches and Dies** for the hardest and most abrasive sheet materials. * **Wear Parts under High Temperature:** * **Hot Work Tooling Inserts** where temperatures are lower than for H13-type steels but wear is extreme (e.g., certain forging die inserts). * **Wear-resistant Guides and Components** in high-temperature machinery. * **Plastic Injection Molds:** * **Cavities and Cores for Extremely Abrasive & Reinforced Plastics** (e.g., high-percentage glass fiber, carbon fiber, ceramic-filled polymers) where high cycle counts generate heat. ## **6. Key Features & Advantages** * **Unrivaled Hot Hardness (Red Hardness):** The high cobalt content allows it to maintain a much higher percentage of its room-temperature hardness at elevated service temperatures (600°C+), a critical property for high-speed or high-friction applications. * **Extreme Abrasion/Wear Resistance:** The combination of a high volume of ultra-hard vanadium carbides and a very hard, cobalt-strengthened matrix provides arguably the best wear resistance available in a commercial tool steel. * **High Temper Resistance:** Excellent resistance to softening during prolonged exposure to operating heat. * **Superior Grindability:** Despite its extreme hardness, the fine, uniform PM carbide structure makes it significantly easier to grind than conventional cobalt HSS grades, reducing processing time and improving surface finish quality. * **Excellent Dimensional Stability:** Predictable and minimal size change during heat treatment due to the homogeneous PM structure. * **Isotropic Properties:** Uniform performance in all directions, free from the directional weaknesses caused by carbide banding in conventionally cast steels. ## **7. Processing Guidelines** * **Machining (Annealed State):** Difficult. Requires rigid setups, sharp carbide tools, and conservative parameters. Pre-hardening is not applicable; it is supplied annealed. * **Grinding:** Use premium CBN or diamond-coated wheels for best results. Its PM structure offers better grindability than its conventional counterparts. * **Electrical Discharge Machining (EDM):** Can be performed. A stress-relief temper after roughing is highly recommended. * **Heat Treatment:** **Complex and critical.** Must be performed in vacuum or protective atmosphere furnaces with precise temperature control. **Triple tempering is non-negotiable** to achieve full hardness, transform retained austenite, and develop optimal properties. * **Surface Treatments:** An excellent substrate for advanced PVD (AlCrN, TiSiN) and CVD coatings, which can further enhance performance in specific applications. **Summary:** Daido DRM2 (DEX40) represents the pinnacle of wear-resistant, cobalt-containing matrix high-speed steel technology. It is a specialized, high-cost material reserved for applications where its extraordinary hot hardness and abrasion resistance directly solve critical failure modes that lower-grade steels cannot address. By leveraging powder metallurgy to combine high levels of cobalt, tungsten, and vanadium, it delivers a level of performance consistency and property balance unattainable with conventional melting. For toolmakers facing the most extreme conditions of wear, pressure, and heat, DRM2 offers a definitive solution to extend tool life and ensure process reliability. -:- For detailed product information, please contact sales. -: International Mold Steel Daido DRM2 Matrix High-Speed Steel Specification Dimensions Size： Diameter 20-1000 mm Length <7035 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 Daido DRM2 Matrix High-Speed Steel Properties -:- For detailed product information, please contact sales. -:

Applications of International Mold Steel Rod Daido DRM2 Matrix High-Speed Steel Rod -:- For detailed product information, please contact sales. -: Chemical Identifiers International Mold Steel Rod Daido DRM2 Matrix High-Speed Steel Rod -:- For detailed product information, please contact sales. -:

Packing of International Mold Steel Rod Daido DRM2 Matrix High-Speed Steel Rod -:- 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 Rod 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 3506 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