Spherical Crucible Steel Powder CPM® Rex® 45® (HS) High Speed Steel Powder

Crucible Steel Spherical Powder CPM® Rex® 45® (HS) High Speed Steel Spherical Powder Product Information -:- For detailed product information, please contact sales. -: Crucible Steel Spherical Powder CPM® Rex® 45® (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® 45® (HS) High Speed Steel Powder characteristics -:- For detailed product information, please contact sales. -: Spherical Crucible Steel Powder CPM® Rex® 45® (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® 45® (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® 45® (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® 45® (HS) High Speed Steel Product Information -:- For detailed product information, please contact sales. -: # **Product Introduction: Crucible CPM® REX® 45® (HS) High Speed Steel** Crucible CPM® REX® 45® (HS) represents a cutting-edge advancement in particle metallurgy high-speed steel technology, specifically engineered to **bridge the performance gap between premium high-speed steels and powder metallurgy tool steels**. This innovative grade combines the exceptional hot hardness and red-hardness of cobalt-bearing high-speed steels with dramatically enhanced wear resistance, creating a truly balanced ultra-premium tool material for the most demanding cutting applications. Manufactured through Crucible's proprietary CPM (Crucible Particle Metallurgy) process, REX 45 features an exceptionally fine and uniform carbide distribution. This microstructure delivers superior grindability compared to conventional high-vanadium steels while maintaining excellent toughness and dimensional stability. The "HS" designation emphasizes its optimized formulation for **high-speed machining operations** where extreme abrasion resistance and thermal stability are equally critical. --- ## **1. Chemical Composition (Weight %)** REX 45 employs a strategic alloy design that maximizes multiple performance characteristics simultaneously. | **Element** | **Carbon (C)** | **Tungsten (W)** | **Molybdenum (Mo)** | **Chromium (Cr)** | **Vanadium (V)** | **Cobalt (Co)** | |-------------|----------------|------------------|---------------------|-------------------|------------------|-----------------| | **Content** | **1.30** | **3.75** | **3.75** | **4.00** | **3.00** | **8.25** | | **Role** | Elevated carbon content enables formation of substantial carbide volume while supporting high attainable hardness. | Provides solid-solution strengthening and contributes to hot hardness through secondary carbide formation. | Primary hardenability agent and hot hardness contributor; balanced with tungsten for optimal matrix properties. | Ensures deep hardenability and moderate corrosion/oxidation resistance during high-temperature operation. | **Critical element** - forms extremely hard vanadium carbides (VC) for exceptional abrasion resistance at elevated temperatures. | **Matrix strengthener** - significantly enhances hot hardness by increasing the matrix's resistance to tempering and thermal softening. | *Note: Iron (Fe) constitutes the remainder. The composition represents an optimized balance between the M4 family (high vanadium) and T15 family (high cobalt).* --- ## **2. Physical & Mechanical Properties** *Typical properties after optimal heat treatment to 66-68 HRC.* * **Density:** 8.05 g/cm³ (0.291 lb/in³) * **Modulus of Elasticity:** ~215 GPa (31.2 x 10⁶ psi) * **Thermal Conductivity:** Moderate, but improved over high-vanadium PM tool steels due to optimized carbide volume and distribution. * **Hot Hardness (Red Hardness):** **Excellent.** Maintains hardness above 63 HRC at temperatures exceeding **600°C (1110°F)**, comparable to premium cobalt HSS grades like REX 20/T15, thanks to its 8.25% cobalt content. * **Hardness (Typical Working Range):** **65 - 69 HRC.** Most commonly utilized at **67-68 HRC**, achieving near-maximum hardness without excessive brittleness. * **Abrasion Resistance:** **Outstanding.** The combination of 3% vanadium and high achievable hardness provides wear resistance significantly superior to conventional cobalt HSS (M35, M42) and approaching that of dedicated wear-resistant grades like CPM 10V, but with vastly superior hot hardness. * **Toughness:** **Good for its performance category.** The CPM microstructure provides better toughness than conventionally processed steels of similar composition. It exhibits noticeably higher toughness than CPM REX 20 while offering superior wear resistance. * **Grindability:** **Fair.** While better than extreme wear steels like CPM 15V, the high vanadium content requires careful grinding practices. CBN (Cubic Boron Nitride) or advanced ceramic aluminum oxide wheels are recommended for hardened material. --- ## **3. Heat Treatment** Proper thermal processing is essential to unlock REX 45's unique combination of properties. * **Annealing:** Heat to 870-900°C (1600-1650°F), slow cool (≤15°C/hr to 600°C). Annealed hardness: 250-280 HB. * **Stress Relieving (After Machining):** 600-650°C (1110-1200°F), hold 2 hours, slow cool. * **Preheating:** **Critical.** Employ a double preheat: First at 540-650°C (1000-1200°F), then at 815-870°C (1500-1600°F). Soak thoroughly to prevent thermal shock. * **Austenitizing:** **1175-1205°C (2150-2200°F).** The recommended range is typically **1185-1195°C (2165-2185°F)** for the best balance of wear resistance, hot hardness, and toughness. Higher temperatures favor hardness and wear resistance at the expense of toughness. * **Quenching:** Use inert gas/pressure quenching (preferred) or still air. Oil quenching is not recommended for precision tools. * **Tempering:** **Triple Tempering Required.** Temper immediately after quenching. **Three cycles** at 540-570°C (1005-1060°F), for 2 hours each, are standard. A significant secondary hardening response occurs. Hardness typically peaks after the second temper. * **Sub-Zero Treatment:** Highly recommended (-80°C to -100°C / -112°F to -148°F) between quenching and first temper to maximize transformation of retained austenite and ensure dimensional stability. --- ## **4. Key Applications** CPM REX 45 is engineered for applications where tools face simultaneous extreme abrasion and high thermal loads. * **High-Performance Cutting of Abrasive Materials:** End mills, drills, and reamers for machining abrasive composites (carbon fiber, fiberglass), high-silicon aluminum alloys, and superalloys with abrasive inclusions. * **High-Speed Machining (HSM) of Hardened Steels:** Milling cutters and boring tools for die/mold work in pre-hardened steels (up to ~50 HRC), where both wear and thermal softening are failure modes. * **Precision Gear & Thread Manufacturing:** Gear hobs and thread milling cutters for high-volume production of hardened or case-hardened components. * **Demanding Forming Operations:** Punches and dies for cold forming stainless steels and other work-hardening materials that generate significant heat and cause abrasive wear. * **Premium Industrial & Specialty Cutting Blades:** Knives for cutting advanced textiles, engineered papers, and laminates where long edge life under continuous operation is critical. --- ## **5. International Standards & Cross-References** REX 45 is a proprietary, optimized grade with no direct equivalent in common standards systems. * **AISI/SAE:** No direct equivalent. It can be viewed as a hybrid composition falling between **M4 (high V)** and **T15/T42 (high Co)** categories with a unique balance. * **ISO:** No standard designation. Its composition aligns with the general **HS (High Speed)** classification but does not match a standard ISO number. * **European (EN):** No direct equivalent. Similar in concept to some proprietary "Super HSS" or "Ultra HSS" grades from European manufacturers. * **Japanese (JIS):** No direct equivalent. Compositionally distinct from standard SKH series grades. * **Common Industry Comparisons:** Often described as a **"high-cobalt CPM M4"** or a **"high-vanadium M48."** The closest competitor analogues are other proprietary PM super-high-speed steels like **Böhler S390 Microclean** or similar grades designed for maximum balanced performance. --- ## **6. Advantages & Limitations** **Advantages:** * **Uncommon Performance Balance:** Offers a rare combination of high wear resistance (from vanadium carbides) and excellent hot hardness (from cobalt). * **Superior to Conventional Cobalt HSS:** Provides significantly better abrasion resistance than M35/M42 while maintaining comparable or better red hardness. * **CPM Microstructure Benefits:** Delivers better toughness, grindability, and consistency than attainable with conventional ingot metallurgy of similar composition. * **Extended Tool Life in Demanding Conditions:** Ideal for applications where tools fail from both edge wear and thermal degradation. **Limitations:** * **High Cost:** Premium pricing due to high cobalt/vanadium content and complex PM manufacturing. * **Grinding Challenges:** Requires appropriate abrasives and techniques; not as grindable as lower-alloy HSS. * **Targeted Application:** Its premium cost is only justified in specific, severe applications; it is not a general-purpose grade. * **Heat Treatment Sensitivity:** Requires precise thermal processing to achieve the intended property balance. --- ## **7. Summary** **Crucible CPM REX 45 (HS) is a sophisticated, hybrid-grade high-speed steel designed for peak performance in the most challenging cutting environments where wear resistance and hot hardness are co-limiting factors.** It represents a strategic material solution for manufacturers pushing the limits of productivity in machining advanced, abrasive, or hard materials. By successfully marrying the key attributes of two different tool steel families, REX 45 offers a compelling alternative where the selection was previously a compromise between wear resistance and thermal stability. -:- For detailed product information, please contact sales. -: Crucible Steel CPM® Rex® 45® (HS) High Speed Steel Specification Dimensions Size： Diameter 20-1000 mm Length <6954 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® 45® (HS) High Speed Steel Properties -:- For detailed product information, please contact sales. -:

Spherical Crucible Steel Powder CPM® Rex® 45® (HS) High Speed Steel Powder Particle Size Description -:- For detailed product information, please contact sales. -: Applications of Spherical Crucible Steel Powder CPM® Rex® 45® (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® 45® (HS) High Speed Steel Spherical Powder -:- For detailed product information, please contact sales. -: Chemical Identifiers Crucible Steel Spherical Powder CPM® Rex® 45® (HS) High Speed Steel Spherical Powder -:- For detailed product information, please contact sales. -:

Packing of Crucible Steel Spherical Powder CPM® Rex® 45® (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 3425 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