Spherical Latrobe Stark™ ASTM M4 High Speed Steel Powder

Latrobe Stark™ ASTM M4 High Speed Steel Spherical Powder Product Information -:- For detailed product information, please contact sales. -: Latrobe Stark™ ASTM M4 High Speed Steel Spherical Powder Synonyms -:- For detailed product information, please contact sales. -: -:- For detailed product information, please contact sales. -: Spherical Latrobe Stark™ ASTM M4 High Speed Steel Powder characteristics -:- For detailed product information, please contact sales. -: Spherical Latrobe Stark™ ASTM M4 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 Latrobe Stark™ ASTM M4 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 Latrobe Stark™ ASTM M4 High Speed Steel Powder Chemical Composition -:- For detailed product information, please contact sales. -: -:- For detailed product information, please contact sales. -: Latrobe Stark™ ASTM M4 High Speed Steel Product Information -:- For detailed product information, please contact sales. -: # **Latrobe Stark™ ASTM M4 High Speed Steel** ## **Ultra-High Vanadium HSS for Extreme Wear Resistance Applications** Latrobe Stark™ M4 is a premium super high-speed steel engineered to deliver exceptional wear resistance and cutting performance in the most demanding machining applications. As a high-carbon, high-vanadium molybdenum-tungsten steel (ASTM A600 M4), it represents the pinnacle of conventional high-speed steel technology, offering superior abrasion resistance that bridges the gap between standard HSS and cemented carbide tools. This grade is specifically formulated for applications where extreme wear is the primary failure mode and where maximum tool life is critical. --- ### **Key Features & Benefits** - **Extreme Wear Resistance**: Exceptionally high vanadium content creates maximum volume of hard vanadium carbides (MC type), providing outstanding abrasion resistance in severe machining conditions - **Superior Hot Hardness**: Maintains cutting edge integrity at temperatures exceeding 560°C (1040°F), enabling productive machining of hardened materials and superalloys - **Extended Tool Life**: Dramatically reduced flank wear and edge degradation translate to significantly longer production runs and reduced tooling costs - **Optimal Substrate for Advanced Coatings**: High base hardness and thermal stability make it an excellent foundation for PVD and CVD coatings (TiAlN, AlCrN, DLC) - **Consistent Performance**: Controlled manufacturing processes ensure uniform carbide distribution and predictable heat treatment response - **Cost-Effective Alternative**: Provides carbide-like wear resistance with the toughness and manufacturability advantages of high-speed steel --- ### **Chemical Composition (Typical %, ASTM A600 M4)** | Element | Carbon (C) | Tungsten (W) | Molybdenum (Mo) | Chromium (Cr) | Vanadium (V) | Cobalt (Co) | |---------|------------|--------------|-----------------|---------------|--------------|-------------| | **Content** | 1.25 - 1.40 | 5.25 - 6.50 | 4.25 - 5.50 | 3.75 - 4.75 | 3.75 - 4.50 | - | *Note: This composition represents the high-carbon, high-vanadium balance that defines M4's exceptional wear characteristics. Silicon (Si) 0.20-0.45% and Manganese (Mn) 0.15-0.40% are present. The high carbon ensures complete utilization of vanadium in carbide formation.* --- ### **Physical & Mechanical Properties** | Property | Value / Description | |----------|---------------------| | **Density** | 8.11 g/cm³ | | **Thermal Conductivity** | 21-24 W/m·K at 20°C | | **Specific Heat Capacity** | 0.45 kJ/kg·K at 20°C | | **Coefficient of Thermal Expansion** | 10.3 × 10⁻⁶/K (20-400°C) | | **Hardness (Annealed)** | 235-260 HB | | **Hardness (Heat Treated)** | **66-68 HRC** (typical achievable working range) | | **Transverse Rupture Strength** | 2,800-3,400 MPa (at 66 HRC) | | **Compressive Strength** | 3,500-4,000 MPa (at 66 HRC) | | **Modulus of Elasticity** | 210-220 GPa | | **Impact Toughness** | Moderate - optimized for wear resistance over shock loading | --- ### **Heat Treatment Guidelines** #### **Annealing** - **Temperature**: 850-870°C (1560-1600°F) - **Method**: Slow furnace cool at ≤18°C (32°F) per hour to 600°C (1110°F), then air cool - **Resultant Hardness**: 235-260 HB - **Special Note**: Longer soaking time required due to high alloy content #### **Stress Relieving** - **Temperature**: 650-680°C (1200-1255°F) - **Hold Time**: 2-3 hours per inch of thickness minimum - **Cooling**: Slow furnace cool to 500°C (930°F), then air cool #### **Hardening (Requires Precise Control)** 1. **Preheating**: **Mandatory double preheat is critical**
• First: 750-800°C (1380-1470°F) - complete equalization
• Second: 980-1010°C (1795-1850°F) - thorough soaking essential 2. **Austenitizing**: **1200-1215°C (2190-2220°F)** - precise control ±3°C recommended 3. **Soak Time**: 3-5 minutes per inch of cross-section (minimum 3 minutes) 4. **Quenching**: Oil quenching preferred for most applications; salt bath for complex shapes 5. **Immediate Handling**: Cool to 50-65°C (120-150°F) before proceeding to next step #### **Tempering (Critical for Performance)** - **Temperature Range**: 540-565°C (1005-1050°F) - **Cycles**: **Triple tempering mandatory** - quadruple tempering recommended for optimum performance - **Duration**: Minimum 2 hours per cycle, air cool to room temperature between cycles - **Target Hardness**: Peak at 66-68 HRC, typically achieved at 540-550°C (1005-1020°F) - **Critical Note**: Avoid tempering between 205-480°C (400-900°F) to prevent embrittlement #### **Sub-Zero Treatment (Highly Recommended)** - **Application**: Essential for maximum transformation of retained austenite - **Temperature**: -100 to -120°C (-148 to -184°F) - **Timing**: After quenching, before first temper - **Duration**: 3-4 hours minimum - **Benefits**: Increases final hardness, improves dimensional stability, enhances wear resistance --- ### **International Standards & Equivalent Grades** | Standard | Grade Designation | Notes | |----------|-------------------|-------| | **ASTM** | A600 M4 | Primary specification (UNS T11304) | | **ISO** | HS6-5-4 | ISO 4957 designation | | **DIN** | 1.3346 / S 6-5-4 | German standard with strict carbide requirements | | **JIS** | SKH54 / M4 | Japanese industrial standard | | **AFNOR** | HS6-5-4 (Z85WDCV 06-05-04-04) | French association standard | | **GB** | W6Mo5Cr4V4 | Chinese equivalent | | **UNS** | T11304 | Unified Numbering System | --- ### **Typical Applications** #### **Premium Cutting Tools for Severe Conditions** - **High-Performance End Mills**: For machining hardened steels (50-65 HRC), high-temperature alloys (Inconel, Waspaloy, Hastelloy), and highly abrasive composites - **Precision Boring & Reaming Tools**: For achieving tight tolerances in hardened materials and superalloys - **Gear Manufacturing Tools**: Premium hobs, shaper cutters, and skiving tools for hardened gear materials - **Threading Operations**: High-performance taps, thread mills, and thread whirling tools for difficult-to-machine materials - **Broaching Tools**: For precision internal and surface broaching of hardened components - **Solid Carbide Alternatives**: In applications requiring HSS toughness with near-carbide wear resistance #### **Specialized Industrial Tooling** - **Cold Forming & Fine Blanking**: Punches, dies, and headers for abrasive or work-hardening materials - **Woodworking & Composite Machining**: Router bits, trimming tools, and shaper cutters for abrasive composites (CFRP, GFRP, ceramic matrix composites) - **Knives & Industrial Blades**: Cutting blades for abrasive non-metallic materials (fiberglass, carbon fiber, reinforced plastics, rubber) - **Wear Components**: Guide pins, bushings, and wear plates in severe abrasive environments #### **Industry-Specific Applications** - **Aerospace Manufacturing**: Machining titanium alloys, nickel-based superalloys, and composite aircraft components - **Automotive Performance Parts**: Machining hardened transmission components, turbocharger parts, and high-performance engine components - **Die & Mold Industry**: Core pins, ejector pins, and inserts for abrasive plastic molding (glass-filled, mineral-filled, ceramic-filled plastics) - **Energy Sector**: Tools for machining valve components, turbine blades, and oilfield equipment in hardened conditions - **Medical Device Manufacturing**: Cutting tools for cobalt-chrome alloys, stainless steels, and titanium implants - **Tool & Die Making**: Master form tools, punches, and dies requiring extreme wear resistance --- ### **Machining & Fabrication Notes** #### **Machinability (Annealed Condition)** - **Rating**: 20-30% of B1112 free-machining steel - **very difficult to machine** - **Recommended Tools**: **Carbide tools exclusively** - use premium grades with wear-resistant coatings - **Cutting Speeds**: 4-8 m/min (12-25 SFM) for turning operations - **Feed Rates**: Light feeds with sharp, positive rake geometries - **Coolant**: **Essential** - use heavy-duty soluble oil or high-performance synthetic coolant - **Tool Geometry**: Sharp cutting edges, adequate clearance angles, chip breakers recommended #### **Grindability** - **Relative Rating**: 25-35 (vs. 100 for annealed O1 tool steel) - **extremely difficult to grind** - **Abrasive Requirements**: **CBN (cubic boron nitride) or diamond wheels strongly recommended** - **Alternative Abrasives**: Only premium ceramic alumina if CBN/diamond unavailable - **Wheel Maintenance**: Frequent dressing required - soft-grade, open-structure wheels preferred - **Coolant**: **Flood coolant mandatory** to prevent thermal damage and micro-cracking - **Grinding Parameters**: Very light infeeds (0.005-0.015 mm/pass), high wheel speeds, continuous downfeed #### **EDM Machining** - Suitable but generates a significant hard, brittle recast layer (white layer) - **Stress relieving after rough EDM is absolutely mandatory** - Final heat treatment should follow finish EDM operations - Additional grinding or polishing required to remove affected surface layer completely - Consider using fine-finish EDM settings with multiple passes to minimize recast layer #### **Wire EDM Specifics** - Use deionized water with proper conductivity control - Multiple skim cuts recommended for better surface finish - Post-EDM stress relief essential for dimensional stability - Surface integrity may require additional abrasive finishing --- ### **Quality Assurance & Metallurgical Standards** #### **Microstructural Requirements** - **Carbide Distribution**: Uniform, fine dispersion of primarily MC (vanadium) carbides - **Maximum Carbide Size**: Strictly controlled - typically ≤10 microns for premium quality - **Carbide Network**: Complete absence of continuous carbide networks at grain boundaries - **Grain Size**: ASTM 10 or finer - **Decarburization**: ≤0.05 mm per side on finished products - **Non-Metallic Inclusions**: ASTM E45, Method D, ≤1.0 total rating #### **Testing & Certification** - Full traceability from electrode to finished product - Chemical analysis via optical emission spectroscopy with wet chemistry verification for critical elements - Hardness testing at multiple stages of production - **Comprehensive carbide analysis** - size, distribution, type, and morphology characterization - Microcleanliness rating per ASTM E45 and SEP 1571 - Ultrasonic testing available for critical applications - Certified material test reports including all relevant metallurgical data and processing history --- ### **Available Product Forms** | Form | Standard Sizes | Condition | Surface Finish | Special Notes | |------|---------------|-----------|----------------|---------------| | **Round Bars** | 5mm - 150mm diameter | Annealed | Centerless Ground, Polished | Premium finish for precision toolmaking | | **Precision Ground Flat Stock** | 6-50mm thickness | Annealed | Ground & Polished | Tight tolerances (±0.05mm) | | **Forged Blanks** | Custom dimensions | Annealed | As-forged, Rough machined | Optimized grain flow for specific tools | | **Billets** | 100-250mm diameter | Annealed | Rough turned | For larger tool applications | | **Near-Net Shapes** | Per customer drawing | Annealed | As-forged | Reduced machining time and material waste | | **Pre-hardened Stock** | Limited sizes | Hardened & Tempered | Ground | For prototype and repair applications | --- ### **Technical Comparison with Related Grades** | Property | Stark™ M4 | M3-2 | M42 (8% Co) | T15 | |----------|-----------|------|-------------|-----| | **Wear Resistance** | **Exceptional** | Excellent | Excellent | **Superior** | | **Hot Hardness** | Excellent | Excellent | **Superior** | Excellent | | **Toughness** | Moderate | Moderate | Fair | Low | | **Grindability** | **Extremely Difficult** | Very Difficult | Moderate | **Exceptionally Difficult** | | **Peak Hardness (HRC)** | 66-68 | 66-68 | 67-69 | 66-68 | | **Primary Application** | Extreme abrasive wear | Severe wear | High temperature | Maximum wear & hot hardness | | **Relative Cost** | High | High | Very High | Highest | --- ### **Coating Compatibility** Stark™ M4 provides an excellent substrate for advanced tool coatings: - **PVD Coatings**: TiN, TiCN, TiAlN, AlCrN, AlTiN, DLC - **CVD Coatings**: TiC, TiCN, TiN, Al₂O₃ - **Pre-treatment**: Proper surface preparation and polishing essential for coating adhesion - **Post-coating**: Low-temperature tempering may be required after certain coating processes --- ### **Storage & Handling Protocol** 1. **Storage Environment**: Climate-controlled with humidity <50% RH 2. **Corrosion Protection**: Coated with high-performance rust preventive oil; VCI paper and desiccants for long-term storage 3. **Material Handling**: Use clean cotton gloves; avoid direct skin contact 4. **Identification**: Clearly marked with grade, heat number, size, and inspection status 5. **Inventory Management**: Implement FIFO system with regular inspection 6. **Safety**: Standard machine shop safety protocols apply; dust collection recommended for grinding operations --- ### **Technical Support & Value-Added Services** Latrobe provides comprehensive technical support for Stark™ M4: - **Application Engineering**: Consultative support for tool design and grade selection - **Heat Treatment Development**: Custom protocols validated in laboratory conditions - **Failure Analysis Laboratory**: Complete metallurgical investigation of tool performance issues - **Machining & Grinding Workshops**: Specialized training for difficult-to-machine materials - **Coating Partnerships**: Integration with leading coating service providers - **Prototyping Support**: Assistance with initial tool trials and performance optimization --- **Select Latrobe Stark™ ASTM M4 High Speed Steel** for the most extreme wear applications where maximum tool life is critical and where the performance justifies the additional grinding and fabrication challenges. This premium grade delivers carbide-like wear resistance while maintaining the toughness and manufacturability advantages of high-speed steel. Stark™ M4 represents the optimal choice when machining highly abrasive materials, hardened steels, or superalloys where maximizing time between tool changes directly impacts production efficiency, quality, and total manufacturing cost. When wear resistance is the primary concern and failure mode, Stark™ M4 provides the ultimate solution in conventional high-speed steel technology. -:- For detailed product information, please contact sales. -: Latrobe Stark™ ASTM M4 High Speed Steel Specification Dimensions Size： Diameter 20-1000 mm Length <7151 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. -: Latrobe Stark™ ASTM M4 High Speed Steel Properties -:- For detailed product information, please contact sales. -:

Spherical Latrobe Stark™ ASTM M4 High Speed Steel Powder Particle Size Description -:- For detailed product information, please contact sales. -: Applications of Spherical Latrobe Stark™ ASTM M4 High Speed Steel Powder -:- For detailed product information, please contact sales. -: -:- For detailed product information, please contact sales. -: Applications of Latrobe Stark™ ASTM M4 High Speed Steel Spherical Powder -:- For detailed product information, please contact sales. -: Chemical Identifiers Latrobe Stark™ ASTM M4 High Speed Steel Spherical Powder -:- For detailed product information, please contact sales. -:

Packing of Latrobe Stark™ ASTM M4 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 3622 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