Spherical Crucible Steel Powder CPM® Rex M4 HC(HS) Tool Steel Powder

Crucible Steel Spherical Powder CPM® Rex M4 HC(HS) Tool Steel Spherical Powder Product Information -:- For detailed product information, please contact sales. -: Crucible Steel Spherical Powder CPM® Rex M4 HC(HS) Tool Steel Spherical Powder Synonyms -:- For detailed product information, please contact sales. -: -:- For detailed product information, please contact sales. -: Spherical Crucible Steel Powder CPM® Rex M4 HC(HS) Tool Steel Powder characteristics -:- For detailed product information, please contact sales. -: Spherical Crucible Steel Powder CPM® Rex M4 HC(HS) Tool 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 M4 HC(HS) Tool 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 M4 HC(HS) Tool Steel Powder Chemical Composition -:- For detailed product information, please contact sales. -: -:- For detailed product information, please contact sales. -: Crucible Steel CPM® Rex M4 HC(HS) Tool Steel Product Information -:- For detailed product information, please contact sales. -: ### **Product Introduction: Crucible CPM® REX® M4 HC (High Carbon) / HS (High Speed) Tool Steel** Crucible CPM REX M4 HC (also known as M4 HS) represents the pinnacle of high-performance high-speed steel (HSS) technology. It is a particle metallurgy (PM) version of the classic AISI M4 grade, but with a crucial enhancement: a significantly higher carbon content compared to standard M4. This "high-carbon" formulation, made feasible by the Crucible Particle Metallurgy (CPM) process, dramatically increases the volume of hard, wear-resistant carbides (primarily vanadium carbides) in the microstructure. The result is a tool steel that delivers an extraordinary balance of three key properties: **superior wear resistance (approaching that of CPM 10V), excellent high-temperature hardness (red hardness) characteristic of high-speed steels, and significantly better toughness than high-vanadium grades like 10V or 15V.** CPM REX M4 HC is engineered for the most demanding cutting and forming applications where tools are pushed to their limits. --- ### **1. Chemical Composition (Weight %)** The elevated carbon content is the defining characteristic that differentiates it from standard M4. | **Element** | **Carbon (C)** | **Tungsten (W)** | **Molybdenum (Mo)** | **Chromium (Cr)** | **Vanadium (V)** | **Cobalt (Co)** | | :--- | :--- | :--- | :--- | :--- | :--- | :--- | | **Content** | **1.35** (HC) | 5.75 | 4.50 | 4.25 | 4.00 | - | | **Role** | **Key Differentiator.** Increased carbon allows for more vanadium and molybdenum carbide formation, boosting wear resistance without sacrificing red hardness. | Provides hot hardness and wear resistance. Forms stable carbides. | Enhances hardenability, hot hardness, and counters temper softening. Similar effect to tungsten but more efficient. | Provides deep hardenability, wear resistance, and some oxidation resistance. | Forms extremely hard, fine vanadium carbides (VC) for exceptional abrasion resistance. | Not present in standard HC grade. Some special variants may include it for even higher hot hardness. | *Note: Standard CPM M4 has ~1.30% C. The HC variant is typically ~1.35-1.40% C. Iron (Fe) constitutes the remainder.* --- ### **2. Physical & Mechanical Properties** *Typical properties at room temperature after proper heat treatment to 63-65 HRC.* * **Density:** 8.10 g/cm³ (0.292 lb/in³) * **Modulus of Elasticity:** ~215 GPa (31.2 x 10⁶ psi) * **Thermal Conductivity:** Moderate for a HSS. Higher than high-vanadium steels like 10V. * **Hot Hardness (Red Hardness):** Excellent. Can maintain a high hardness (above 60 HRC) at temperatures exceeding 540°C (1000°F), a hallmark of molybdenum-tungsten high-speed steels. * **Hardness (Typical Working Range):** **62 - 66 HRC.** Commonly used at **63-65 HRC**. * **Abrasion Resistance:** **Very High.** Significantly better than conventional M2 or M42 HSS, and comparable to or slightly better than D2. Approaches the lower range of CPM 10V. * **Toughness:** **Good for its wear resistance level.** It possesses substantially higher toughness and resistance to chipping than CPM 10V, making it far more suitable for cutting tools and applications with intermittent stress. * **Grindability:** Fair to difficult. Better than CPM 10V due to a different carbide type/distribution, but requires aluminum oxide or CBN wheels. --- ### **3. Heat Treatment** Heat treatment is critical to unlocking the full potential of CPM REX M4 HC. * **Annealing:** Heat to 870-900°C (1600-1650°F), slow cool. Typical annealed hardness: 240-280 HB. * **Stress Relieving:** 650-675°C (1200-1250°F), then slow cool. * **Preheating:** **Essential.** Double preheat: First at 540-650°C (1000-1200°F), then at 815-870°C (1500-1600°F). * **Austenitizing:** 1175-1225°C (2150-2240°F). Higher temperatures maximize hot hardness and wear resistance but reduce toughness. * **Quenching:** Air quench, positive pressure gas quenching, or salt bath quenching. Oil quenching can be used for complex shapes but increases distortion risk. * **Tempering:** **Mandatory Multiple Tempers.** Temper immediately after quenching. **Minimum of three tempers**, each for 2 hours, is standard practice. Typical tempering range: 540-595°C (1000-1100°F). A noticeable secondary hardening peak occurs, increasing hardness after the first temper. * **Sub-Zero Treatment:** Often recommended between quenching and tempering to transform retained austenite, improving dimensional stability and final hardness. --- ### **4. Key Applications** CPM REX M4 HC is the material of choice for severe applications requiring a balance of wear resistance, toughness, and hot hardness. * **High-Performance Cutting Tools:** Broaches, gear hobs, milling cutters, end mills, and form tools for machining difficult-to-cut materials (e.g., high-temperature alloys, stainless steels, abrasive composites). * **Punches and Dies:** For cold work applications on abrasive materials, such as stamping high-strength steel, silicon steel laminations, or non-ferrous alloys. * **Roll Forming & Thread Rolling:** Rolls for forming hard or abrasive wires and rods. * **Precision Knives:** Industrial blades for slitting, shearing, or cutting abrasive materials like carbon fiber, plastics, and paper where edge integrity under heat is critical. * **Woodworking Tools:** Premium planer knives and router bits for processed or abrasive woods. --- ### **5. International Standards & Cross-References** It is fundamentally a high-carbon variant of the standard AISI M4 grade. * **AISI/SAE:** M4 (High Carbon variant). Often designated as **M4 HC** or **M4 HS**. * **UNS:** T11304 (shared with standard M4, carbon range may vary). * **European (EN):** HS 2-9-2-5 / **1.3344** (The composition is very close, but the exact carbon content of 1.35% may be at the top end of the range). * **Japanese (JIS):** SKH54 (SKH54 typically has a slightly different W/Mo balance but is a close functional equivalent). * **ISO:** HS2-9-2. * **Common Trade Names:** CPM M4 HC, REX M4 HS, "Super M4". --- ### **6. Advantages & Limitations** **Advantages:** * **Optimal Balance:** Arguably the best practical balance of wear resistance, toughness, and hot hardness among high-alloy tool steels. * **Superior to Standard M4:** The increased carbon content provides a clear jump in wear resistance without major sacrifices. * **Excellent for Cutting Tools:** Its combination of red hardness and toughness makes it ideal for demanding machining operations where tools experience heat and shock. * **CPM Benefits:** Uniform microstructure ensures consistent performance, better grindability, and improved dimensional stability. **Limitations:** * **Moderate Corrosion Resistance:** Not a stainless steel; requires protection from moisture. * **Heat Treatment Complexity:** Requires precise, high-temperature austenitizing and multiple tempers for optimal performance. * **Cost:** Higher than conventional HSS and tool steels due to alloy content and PM processing. * **Not the Ultimate in Any Single Property:** While balanced, it does not match the pure wear resistance of CPM 15V nor the toughness of lower-alloy steels. --- **In summary, Crucible CPM REX M4 HC/HS is a premium, balanced-performance high-speed steel designed for the most challenging industrial applications.** It is the go-to material when a tool must simultaneously resist abrasion, withstand high operating temperatures, and survive the mechanical shocks of interrupted cutting or forming. Its "high-carbon" formulation via PM technology makes it a direct upgrade over traditional M4 for severe service conditions. -:- For detailed product information, please contact sales. -: Crucible Steel CPM® Rex M4 HC(HS) Tool Steel Specification Dimensions Size： Diameter 20-1000 mm Length <6951 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 M4 HC(HS) Tool Steel Properties -:- For detailed product information, please contact sales. -:

Spherical Crucible Steel Powder CPM® Rex M4 HC(HS) Tool Steel Powder Particle Size Description -:- For detailed product information, please contact sales. -: Applications of Spherical Crucible Steel Powder CPM® Rex M4 HC(HS) Tool Steel Powder -:- For detailed product information, please contact sales. -: -:- For detailed product information, please contact sales. -: Applications of Crucible Steel Spherical Powder CPM® Rex M4 HC(HS) Tool Steel Spherical Powder -:- For detailed product information, please contact sales. -: Chemical Identifiers Crucible Steel Spherical Powder CPM® Rex M4 HC(HS) Tool Steel Spherical Powder -:- For detailed product information, please contact sales. -:

Packing of Crucible Steel Spherical Powder CPM® Rex M4 HC(HS) Tool 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 3422 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