Spherical Crucible Steel Powder CPM® REX® 66 (HS) High Speed Steel Powder

Crucible Steel Spherical Powder CPM® REX® 66 (HS) High Speed Steel Spherical Powder Product Information -:- For detailed product information, please contact sales. -: Crucible Steel Spherical Powder CPM® REX® 66 (HS) High Speed Steel Spherical Powder Synonyms -:- For detailed product information, please contact sales. -: -:- For detailed product information, please contact sales. -: Spherical Crucible Steel Powder CPM® REX® 66 (HS) High Speed Steel Powder characteristics -:- For detailed product information, please contact sales. -: Spherical Crucible Steel Powder CPM® REX® 66 (HS) High Speed Steel Powder Particle Size -:- For detailed product information, please contact sales. -: -:- -:- 0-15μm ,5-25μm, 15-45μm, 15-53μm,20-63um, 45-75μm, 45-105μm, 45-150μm ,75-150μm. (Various granularities can be customized according to customer requirements) -:- For detailed product information, please contact sales. -:

Spherical Crucible Steel Powder CPM® REX® 66 (HS) High Speed Steel Powder Applicable processes -:- For detailed product information, please contact sales. -: Laser/electron beam additive manufacturing (SLM/EBM, 3D printing) Direct laser deposition (DLD) Used in thermal spray (TSA) Powder hot isostatic pressing (HIP) Metal injection molding (MIM) Powder metallurgy (PM) Laser cladding (LC), etc. -:- For detailed product information, please contact sales. -: Spherical Crucible Steel Powder CPM® REX® 66 (HS) High Speed Steel Powder Chemical Composition -:- For detailed product information, please contact sales. -: -:- For detailed product information, please contact sales. -: Crucible Steel CPM® REX® 66 (HS) High Speed Steel Product Information -:- For detailed product information, please contact sales. -: # **Product Introduction: Crucible CPM® REX® 66 (HS) High Speed Steel** Crucible CPM® REX® 66 (HS) represents a super-premium, particle metallurgy high-speed steel engineered to redefine the limits of cutting tool performance. It sits at the apex of the REX series, specifically designed for applications where **extreme hot hardness, exceptional wear resistance, and sufficient toughness must converge to overcome the most challenging machining operations.** The "HS" designation underscores its optimization for **High-Speed** machining of materials that aggressively wear and thermally degrade conventional tool steels. Manufactured via the Crucible Particle Metallurgy (CPM) process, REX 66 achieves a microstructure impossible with conventional casting: an ultra-fine, homogeneous distribution of complex carbides within a highly alloyed matrix. This eliminates the performance-limiting carbide segregation of ingot steels, resulting in **superior grindability (relative to its alloy content), excellent dimensional stability, and dramatically improved transverse toughness.** REX 66 is the material solution for machining advanced aerospace superalloys, high-hardness die steels, and abrasive composites at productive speeds where other high-speed steels fail prematurely. --- ## **1. Chemical Composition (Weight %)** The chemistry of REX 66 is a masterfully balanced, high-alloy system designed to maximize multiple high-temperature properties simultaneously. | **Element** | **Carbon (C)** | **Tungsten (W)** | **Molybdenum (Mo)** | **Chromium (Cr)** | **Vanadium (V)** | **Cobalt (Co)** | | :--- | :--- | :--- | :--- | :--- | :--- | :--- | | **Content** | **1.40 - 1.50** | **9.50 - 10.50** | **3.00 - 3.50** | **3.50 - 4.00** | **2.75 - 3.25** | **8.50 - 9.50** | | **Role** | Critical for forming the high volume of carbides necessary for ultra-high hardness and wear resistance. Optimized to support the alloy matrix at extreme hardness levels. | Primary contributor to **hot hardness (red hardness)** and secondary hardening; provides solid solution strengthening. | Enhances hardenability, hot strength, and tempering resistance; works synergistically with tungsten. | Ensures deep, uniform hardenability and provides oxidation resistance at elevated temperatures. | Forms a high volume of extremely hard vanadium carbides (VC), delivering **exceptional abrasion resistance** at the cutting edge. | **Key performance enhancer.** Dramatically increases hot hardness by strengthening the ferrite matrix, allowing the tool to maintain its edge integrity at extreme cutting temperatures. | *Note: Iron (Fe) constitutes the remainder. This composition is often characterized as a premium, cobalt-enhanced evolution of M48-type chemistry with optimized balance for PM processing.* --- ## **2. Physical & Mechanical Properties** *Typical properties after optimal heat treatment to a working hardness of 67-70 HRC.* * **Density:** ~8.30 g/cm³ (0.300 lb/in³) * **Modulus of Elasticity:** ~215 GPa (31.2 x 10⁶ psi) * **Thermal Conductivity:** Moderate; cobalt content aids somewhat in heat transfer from the cutting edge. * **Hot Hardness (Red Hardness):** **Exceptional.** Maintains a hardness above 64 HRC at temperatures exceeding **600°C (1110°F)**, allowing for significantly higher cutting speeds and feeds in tough materials without thermal softening. * **Hardness (Typical Working Range):** **67 - 70 HRC.** It is commonly applied at **68-69 HRC**, making it one of the hardest commercially available high-speed steels, capable of reliably reaching 70 HRC with proper heat treatment. * **Abrasion Resistance:** **Outstanding.** The combination of high carbon (~1.45%), high vanadium (~3%), and ultra-high achievable hardness results in wear resistance that surpasses M42, M48, and approaches that of dedicated high-wear PM tool steels. * **Toughness:** **Good for its performance category.** The CPM process provides **significantly higher and more consistent toughness** than conventionally processed steels of similar composition (e.g., cast M48). While lower than less alloyed grades like M2 or M4, its toughness is remarkably high given its extreme hardness and wear characteristics, reducing the risk of catastrophic chipping. * **Grindability:** **Difficult.** The high hardness and volume of hard vanadium carbides necessitate expert grinding practices. **CBN (Cubic Boron Nitride) wheels are essential** for efficient and precise sharpening of hardened tools. --- ## **3. Heat Treatment** Precision heat treatment is non-negotiable to unlock the full potential of REX 66. Strict process control is required. * **Annealing:** Heat to 870-900°C (1600-1650°F), slow cool at ≤15°C/hr to 600°C. Annealed hardness: 280-330 HB. * **Stress Relieving (After Machining):** 650-700°C (1200-1290°F), hold 2 hours, slow cool. * **Preheating:** **Mandatory.** Use a thorough **double preheat**: First at 540-650°C (1000-1200°F), then at 815-870°C (1500-1600°F) with complete soaking. * **Austenitizing:** **1190-1220°C (2175-2230°F).** The standard recommended range is **1200-1210°C (2190-2210°F)**. Temperature must be tightly controlled—higher temperatures maximize wear resistance and hot hardness but reduce toughness. * **Quenching:** **Gas/Pressure quenching** (vacuum or controlled atmosphere) is strongly preferred for optimal dimensional stability. Air quenching is acceptable for simple geometries. * **Tempering:** **Multiple Tempers Are Required.** Temper immediately after quenching. **Minimum of three tempers**, each for 2 hours, is standard. **Typical tempering range: 540-560°C (1005-1040°F).** A very strong secondary hardening response is observed, with hardness often peaking after the second temper. * **Sub-Zero Treatment:** **Highly recommended** (-80°C to -100°C / -112°F to -148°F) between quenching and the first temper to maximize transformation of retained austenite, ensuring peak hardness, dimensional stability, and thermal conductivity in service. --- ## **4. Key Applications** CPM REX 66 is engineered for the most severe, high-value machining operations where tool performance is the limiting factor for productivity. * **High-Speed Machining of Superalloys:** End mills, drills, and reamers for aerospace components made from nickel-based (Inconel 718, Waspaloy) and cobalt-based superalloys. * **Hard Machining / Die & Mold Making:** Finishing and semi-roughing end mills for machining pre-hardened mold steels (50-62 HRC) and high-speed steel tooling. * **High-Performance Gear & Thread Manufacturing:** Premium gear hobs, shaper cutters, and thread mills for producing high-strength, precision gears and fasteners. * **Machining Abrasive Composites:** Cutting tools for carbon fiber reinforced polymers (CFRP), fiberglass, and metal matrix composites. * **Premium Cutting Tools for Titanium Alloys:** Tools designed for efficient machining of titanium, where heat buildup and work hardening are significant challenges. --- ## **5. International Standards & Cross-References** CPM REX 66 is a proprietary grade, representing a top-tier PM super high-speed steel. * **AISI/SAE:** No direct equivalent. Its composition is closest to a premium **PM version of M48** with possible cobalt optimization. * **ISO:** No direct ISO equivalent. Falls under the general category of high-cobalt high-speed steels. * **European (EN):** No direct EN equivalent. Similar in concept to proprietary "HS (High Speed)" grades with very high cobalt and vanadium. * **Japanese (JIS):** **SKH57** or **SKH59** are similar high-cobalt, high-hardness high-speed steels, but not direct equivalents. * **Common Trade Names/Comparisons:** Often benchmarked against other PM super high-speed steels like **Böhler S590** or **Uddeholm Vancron SuperClean**. It is positioned as a superior alternative to conventional M48 and M42. --- ## **6. Advantages & Limitations** **Advantages:** * **Unmatched Combination of Hardness & Hot Hardness:** Can achieve near-maximum HSS hardness while maintaining exceptional red hardness. * **Superior Wear Resistance at High Temperature:** Maintains its cutting edge longer under severe thermal and abrasive duress than virtually any other HSS. * **CPM Microstructure Benefits:** Enhanced toughness, grindability, and dimensional stability compared to ingot-cast equivalents. * **Extended Tool Life in Demanding Conditions:** Drastically increases productivity and reduces tooling costs in the most challenging applications. **Limitations:** * **Very High Cost:** Premium pricing due to high cobalt, tungsten, vanadium content and complex PM processing. * **Grinding Challenges:** Requires dedicated CBN grinding equipment and expertise. * **Demanding Heat Treatment:** Requires precise, high-temperature furnace capabilities and strict process control. * **Targeted Application:** Its full potential and cost-effectiveness are realized only in specific, severe applications where its capabilities are fully utilized. --- ## **7. Summary** **Crucible CPM REX 66 (HS) is a state-of-the-art super high-speed steel that defines the upper echelon of cutting tool material performance.** It is not an incremental improvement but a strategic material for overcoming machining barriers that limit productivity in aerospace, advanced mold & die, and high-performance manufacturing. By leveraging particle metallurgy to perfect a high-cobalt, high-vanadium chemistry, REX 66 delivers an unprecedented combination of ultra-high hardness, exceptional red hardness, and usable toughness. For manufacturers facing the most difficult-to-machine materials, investing in REX 66 tooling translates directly into higher cutting speeds, longer tool life, greater process reliability, and a decisive competitive advantage. -:- For detailed product information, please contact sales. -: Crucible Steel CPM® REX® 66 (HS) High Speed Steel Specification Dimensions Size： Diameter 20-1000 mm Length <6971 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. -: Crucible Steel CPM® REX® 66 (HS) High Speed Steel Properties -:- For detailed product information, please contact sales. -:

Spherical Crucible Steel Powder CPM® REX® 66 (HS) High Speed Steel Powder Particle Size Description -:- For detailed product information, please contact sales. -: Applications of Spherical Crucible Steel Powder CPM® REX® 66 (HS) High Speed Steel Powder -:- For detailed product information, please contact sales. -: -:- For detailed product information, please contact sales. -: Applications of Crucible Steel Spherical Powder CPM® REX® 66 (HS) High Speed Steel Spherical Powder -:- For detailed product information, please contact sales. -: Chemical Identifiers Crucible Steel Spherical Powder CPM® REX® 66 (HS) High Speed Steel Spherical Powder -:- For detailed product information, please contact sales. -:

Packing of Crucible Steel Spherical Powder CPM® REX® 66 (HS) High Speed Steel Spherical Powder -:- 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 Spherical Powder 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 3442 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