AISI Type M4 Molybdenum High Speed Tool Steel Tube,Pipe (UNS T11304)

AISI Type M4 Molybdenum High Speed Tool Steel Tube (UNS T11304) Product Information -:- For detailed product information, please contact sales. -: AISI Type M4 Molybdenum High Speed Tool Steel Tube (UNS T11304) Synonyms -:- For detailed product information, please contact sales. -:

AISI Type M4 Molybdenum High Speed Tool Steel (UNS T11304) Product Information -:- For detailed product information, please contact sales. -: # **Product Introduction: AISI Type M4 Ultra-High-Vanadium Molybdenum High-Speed Tool Steel (UNS T11304)** ## **Overview** AISI Type M4 is an **ultra-high-vanadium, high-carbon molybdenum-tungsten high-speed steel** that represents one of the **highest wear-resistant conventional HSS grades** available. With its **exceptional vanadium content (3.75-4.25%) and high carbon (1.25-1.40%)**, M4 delivers **outstanding abrasion resistance and edge retention** in the most severe cutting applications. This grade is specifically engineered for machining **extremely abrasive materials** where standard and even high-vanadium HSS grades fail prematurely, offering a balance between extreme wear resistance and reasonable toughness within the conventional HSS family. **Key Advantages:** - **Exceptional Wear Resistance:** Highest vanadium content in conventional M-series provides superior abrasion resistance - **Excellent Edge Retention:** Maintains sharp cutting edges in extremely abrasive conditions - **Good Hot Hardness:** Maintains reasonable cutting performance at elevated temperatures - **High Hardness Potential:** Can achieve 64-67 HRC with proper heat treatment - **Proven in Severe Service:** Established performance in the most demanding abrasive applications **Primary Considerations:** - **Very Poor Grindability:** Extremely difficult to grind due to high vanadium carbide content - **Reduced Toughness:** Lower impact resistance than lower-vanadium HSS grades - **High Cost:** Premium pricing due to alloy content and processing challenges - **Specialized Application:** Only justified for extreme abrasive conditions - **Processing Sensitivity:** Requires precise heat treatment control ## **International Designations & Standards** | Standard System | Designation | Note | |----------------|-------------|------| | **AISI/SAE (USA)** | M4 | Primary specification | | **UNS (USA)** | T11304 | Unified numbering system | | **ASTM (USA)** | A600 | High-Speed Tool Steel Standard | | **ISO (International)** | ~**HS6-5-4-2** | Similar high-vanadium composition | | **DIN (Germany)** | 1.3344 | Equivalent high-vanadium HSS | | **JIS (Japan)** | SKH54 | Japanese high-vanadium HSS | | **BS (UK)** | **BM4** | British standard M4 | | **GB (China)** | W6Mo5Cr4V4 | Chinese high-vanadium HSS | | **AFNOR (France)** | Z130WDCV06-05-04-04 | French high-vanadium designation | *Note: M4 represents the pinnacle of conventional high-vanadium HSS technology, offering maximum wear resistance before transitioning to powder metallurgy or specialized grades.* --- ## **1. Chemical Composition (Typical, Weight %)** M4's composition is optimized for maximum vanadium carbide formation within a balanced tungsten-molybdenum matrix. | Element | Content (%) | Role & Metallurgical Effect | |---------|-------------|-----------------------------| | **Carbon (C)** | 1.25 - 1.40 | **Very high level.** Provides essential carbon for extensive vanadium carbide (VC) formation and maintains matrix hardness. Critical for wear resistance. | | **Vanadium (V)** | 3.75 - 4.25 | **Ultra-high wear element.** Forms massive amounts of extremely hard vanadium carbides (VC, V₄C₃) that provide exceptional abrasion resistance. Highest practical level in conventional HSS manufacturing. | | **Tungsten (W)** | 5.25 - 6.50 | Provides hot hardness through tungsten carbide formation and solid solution strengthening. | | **Molybdenum (Mo)** | 4.25 - 5.50 | Works synergistically with tungsten for hot hardness and hardenability. | | **Chromium (Cr)** | 3.75 - 4.50 | Standard for hardenability, oxidation resistance, and chromium carbide formation. | | **Cobalt (Co)** | 0.0 - 1.00 (Optional) | Sometimes added for specific applications requiring enhanced hot hardness (designated M4+Co). | | **Silicon (Si)** | 0.20 - 0.45 | Deoxidizer and matrix strengthener. | | **Manganese (Mn)** | 0.15 - 0.40 | Enhances hardenability. | | **Sulfur (S)** | ≤0.030 | Residual impurity. | | **Phosphorus (P)** | ≤0.030 | Residual impurity. | | **Iron (Fe)** | Balance | Matrix element. | **Key Metallurgical Features:** - **Vanadium Carbide Volume:** ~15-20% (highest in conventional M-series) - **Carbon-Vanadium Ratio:** ~0.3:1 (optimized for maximum VC formation) - **Primary Carbide Types:** MC (V-rich, ~60-70%), M₆C (W/Mo-rich, ~25-35%), M₂₃C₆ (Cr-rich, ~5-10%) - **Carbide Size Distribution:** Coarser than lower-vanadium grades in conventional production - **Austenitizing Temperature:** 1200-1240°C (2190-2265°F) --- ## **2. Physical & Mechanical Properties** ### **Physical Properties** | Property | Typical Value | Conditions/Notes | |----------|---------------|------------------| | **Density** | 8.10 - 8.20 g/cm³ | At 20°C (68°F) | | **Melting Range** | 1350 - 1400°C (2460 - 2550°F) | | | **Thermal Conductivity** | 20 - 25 W/m·K | At 20°C (68°F) - Lower due to high carbide content | | **Specific Heat Capacity** | 410 - 450 J/kg·K | At 20°C (68°F) | | **Coefficient of Thermal Expansion** | 10.6 - 11.4 × 10⁻⁶/K | 20-600°C (68-1110°F) range | | **Electrical Resistivity** | 0.58 - 0.66 μΩ·m | At 20°C (68°F) | | **Elastic Modulus** | 210 - 220 GPa (30.5 - 31.9 × 10⁶ psi) | At room temperature | | **Thermal Diffusivity** | 5.5 - 6.5 mm²/s | At 20°C (68°F) | ### **Mechanical Properties (Properly Heat-Treated)** | Property | Value Range | Heat Treatment Condition | |----------|-------------|--------------------------| | **Hardness (Annealed)** | 248 - 302 HB | Annealed condition | | **Hardness (Hardened)** | 64 - 67 HRC | Triple tempered condition | | **Hot Hardness (600°C)** | 56 - 59 HRC | After 4 hours at temperature | | **Transverse Rupture Strength** | 2800 - 3400 MPa (406 - 493 ksi) | At 65-66 HRC | | **Compressive Strength** | 3700 - 4300 MPa (537 - 624 ksi) | At 65-66 HRC | | **Impact Toughness (Charpy)** | 8 - 15 J (5.9 - 11.1 ft·lb) | At 65-66 HRC - Lower due to high carbide content | | **Young's Modulus** | 210 - 220 GPa (30.5 - 31.9 × 10⁶ psi) | At room temperature | | **Fatigue Strength** | 650 - 800 MPa (94 - 116 ksi) | Rotating bending, 10⁷ cycles | ### **Wear Performance Comparison** | Wear Mechanism | M4 Performance | vs M2 Improvement | vs M3 Class 2 Improvement | |----------------|----------------|-------------------|---------------------------| | **Abrasive Wear** | Outstanding | 80-120% better | 20-40% better | | **Adhesive Wear** | Excellent | 50-80% better | 15-30% better | | **Edge Retention** | Exceptional | 3-5x longer | 1.5-2x longer | | **Crater Wear** | Very Good | 40-60% better | 10-20% better | | **Overall Tool Life** | 4-8x M2 in abrasion | 300-700% improvement | 50-100% improvement | ### **Grindability Characteristics** - **Relative Grindability:** 30-40% (compared to M2 = 100%) - **Wheel Selection:** **Diamond wheels essential** for efficient grinding - **Wheel Life:** 15-25% of M2 grinding - **Power Requirement:** 50-70% higher than M2 - **Surface Finish:** Very challenging, requires specialized technique - **Grinding Cost:** 3-5x higher than M2 - **Recommended Grit Size:** 100-200 mesh diamond wheels --- ## **3. Product Applications** ### **Primary Application Areas** **1. Extreme Abrasive Material Machining:** - Cutting tools for **high-silicon aluminum alloys** (Si >15%) - Tools for **metal matrix composites** (MMCs) with high ceramic content - Cutting tools for **advanced composites** (CFRP, CMC, MMC) - Tools for **abrasive cast irons** with high carbide volumes **2. Severe Industrial Applications:** - Cutting tools for **hard facing materials** (Stellite, Tribaloy) - Tools for **weld overlay removal** and cladding machining - Cutting tools for **fiberglass and reinforced plastics** - Tools for **abrasive rubber compounds** and filled polymers **3. Specialized Production Tools:** - Broaches for **sintered metal parts** and powder metallurgy components - Gear hobs for **abrasive gear materials** - Form tools for **high-volume abrasive production** - Cutting tools for **mineral-filled materials** ### **Industry-Specific Applications** | Industry | Typical M4 Components | Material Examples | |----------|-----------------------|-------------------| | **Automotive** | Cylinder bore tools, piston machining tools | Hypereutectic aluminum (Si 17-22%) | | **Aerospace** | Composite machining tools, titanium with coatings | CFRP, MMCs, thermal barrier coatings | | **Electronics** | Ceramic substrate machining tools | Alumina, silicon nitride, aluminum nitride | | **Oil & Gas** | Valve component tools, drilling equipment tools | Hard facing alloys, abrasive slurries | | **Plastics** | Cutting tools for filled polymers | Glass-filled nylons, mineral-filled compounds | ### **Performance in Specific Materials** | Work Material | Recommended Operation | Alternative Solutions | M4 Advantage | |---------------|----------------------|---------------------|--------------| | **Hypereutectic Al-Si (17-22% Si)** | Boring, turning, milling | PCD, ceramic | Cost-effective vs PCD, better than carbide | | **Metal Matrix Composites (Al-SiC)** | Drilling, milling | PCD, diamond-coated | Balance of performance and cost | | **Fiber-Reinforced Plastics** | Trimming, routing | Diamond-coated, carbide | Edge retention, reduced delamination | | **Hard Facing Alloys** | Turning, facing | Ceramic, CBN | Toughness advantage over ceramics | | **Abrasive Cast Iron** | Milling, drilling | CBN, carbide | Cost advantage over CBN | --- ## **4. Heat Treatment Guidelines** ### **Annealing** - **Temperature:** 850-880°C (1560-1615°F) - **Soaking Time:** 3-4 hours minimum - **Cooling Rate:** ≤10°C/hr to 540°C, then air cool - **Resulting Hardness:** 248-302 HB - **Atmosphere:** **Protective atmosphere essential** to prevent decarburization ### **Stress Relieving** - **After Rough Machining:** 600-650°C (1110-1200°F), 2-3 hours - **After Rough Grinding:** 550-600°C (1020-1110°F), 1-2 hours - **Cooling:** Slow furnace cool ### **Hardening Process** 1. **Preheating (Critical - Three-stage mandatory):** - **Stage 1:** 450-550°C (840-1020°F) - **Stage 2:** 800-850°C (1470-1560°F) - **Stage 3:** 1050-1100°C (1920-2010°F) - **Essential for M4** 2. **Austenitizing:** - **Temperature:** 1200-1240°C (2190-2265°F) - **Soaking Time:** 3-6 minutes per 25mm thickness - **Atmosphere:** **Vacuum or salt bath mandatory** for consistent results - **Quench Options:** Oil, salt marquench, or press quench 3. **Quenching:** - **Oil Quench:** Fast quenching oil, 40-60°C, vigorous agitation - **Salt Bath Marquench:** 500-550°C, equalize, then air cool (preferred) - **Press Quenching:** Recommended for complex or thin tools ### **Tempering (Critical Process)** - **First Temper:** Begin at 60-80°C (140-175°F) after quenching - **Temperature:** 540-580°C (1000-1075°F) - **Cycles:** **Minimum 3 tempers, 4 strongly recommended** - **Duration:** 2-3 hours per temper cycle - **Cooling:** Air cool completely between tempers - **Final Hardness:** 64-67 HRC - **Retained Austenite:** <5% after proper treatment ### **Sub-Zero Treatment (Highly Recommended)** - **Temperature:** -80 to -120°C (-110 to -185°F) - **Duration:** 3-6 hours - **Timing:** After quenching, before first temper - **Benefits:** Essential for dimensional stability, maximum hardness - **Hardness Increase:** 0.5-1.5 HRC typical --- ## **5. Manufacturing & Processing** ### **Machinability (Annealed Condition)** - **Relative Machinability:** 20-30% (1% carbon steel = 100%) - **Tool Requirements:** **Premium carbide grades mandatory** - **Cutting Parameters:** - Turning: 10-20 m/min (33-66 SFM) with carbide - Milling: 8-15 m/min (26-50 SFM) with carbide - Drilling: 4-8 m/min (13-26 SFM) with carbide - **Chip Control:** Aggressive chip breakers essential - **Coolant:** High-performance synthetic coolant required ### **Grinding Operations (Extremely Challenging)** - **Abrasive Requirements:** - **Primary:** **Diamond wheels** (resin bond preferred) - **Secondary:** **CBN wheels** (vitrified bond) - **Not Acceptable:** Aluminum oxide wheels - **Parameters for Diamond Wheels:** - Wheel Speed: 18-22 m/s (3500-4300 SFPM) - Infeed: 0.001-0.005 mm/pass - Crossfeed: 0.5-1.0 mm/pass - Spark-out: 4-6 passes minimum - **Coolant:** High-pressure, high-volume synthetic coolant essential - **Dressing:** Frequent dressing with diamond tools ### **Electrical Discharge Machining (EDM)** - **Suitability:** Limited - requires extreme care - **Electrodes:** Premium graphite or copper-tungsten - **Parameters:** Very fine finishes, low amperage - **Post-EDM:** **Mandatory** stress relief and retempering - **White Layer:** Significant - must be removed by grinding ### **Surface Treatments & Coatings** - **Recommended Coatings:** TiAlN, AlCrN, diamond-like carbon (DLC) - **Coating Benefits:** 3-8x tool life improvement in abrasive conditions - **Pre-coating Preparation:** Critical - surface finish <0.3 μm Ra - **Edge Preparation:** Precision honing (0.02-0.05mm radius) essential - **Coating Thickness:** 2-5 microns optimal --- ## **6. Comparative Analysis** ### **vs. Other High-Wear Tool Materials** | Property | M4 (HSS) | M42 (8%Co HSS) | C2 Carbide | CBN | PCD | |----------|----------|----------------|------------|-----|-----| | **Hardness (HRC equiv)** | 64-67 | 66-68 | 92-93 HRA | 4500 HV | 7000 HV | | **Wear Resistance** | Excellent | Good | Very Good | Outstanding | Exceptional | | **Toughness** | Fair | Fair | Poor | Very Poor | Poor | | **Hot Hardness** | Good | Excellent | Excellent | Outstanding | Good | | **Cost Factor** | 2.0-2.5x M2 | 2.2-2.8x M2 | 3-5x M2 | 10-20x M2 | 15-30x M2 | | **Best For** | Severe abrasion | High temperature | General wear | Hard materials | Non-ferrous abrasion | ### **Performance Positioning** | Application | M4 Suitability | Primary Competition | Selection Criteria | |-------------|----------------|-------------------|-------------------| | **High-Si Aluminum** | Excellent | PCD, diamond-coated | Volume, cost, complexity | | **MMCs** | Very Good | PCD, ceramic | Ceramic content, volume | | **Composites** | Good | Diamond tools, carbide | Fiber type, production rate | | **Hard Facing** | Good | Ceramic, CBN | Interruption, cost | | **Abrasive Plastics** | Very Good | Carbide, coated tools | Filler type, volume | ### **Economic Analysis** - **Material Cost:** 100-150% premium over M2 - **Tool Life Improvement:** 4-8x M2 in severe abrasion - **Grinding Cost:** 4-6x higher than M2 - **Total Cost Benefit:** Positive only in extreme abrasive conditions - **Break-Even Point:** Typically 6-18 months in production - **Optimal Volume:** Moderate to high production of abrasive materials --- ## **7. Quality Standards & Specifications** ### **Material Quality Requirements** - **Chemical Composition:** Strict adherence to AISI ranges - **Decarburization Limit:** Maximum 0.08mm per side - **Hardness Uniformity:** ±1.0 HRC for critical applications - **Microstructure:** Uniform carbide distribution essential - **Surface Quality:** Highest standards required ### **Testing & Certification** - **Full Chemical Analysis:** Spectrographic with full traceability - **Hardness Mapping:** Extensive verification required - **Microstructural Examination:** Detailed carbide analysis mandatory - **Performance Testing:** Recommended for validation - **Certification:** Comprehensive documentation essential ### **Industry Standards Compliance** - **ASTM A600:** Primary governing standard - **ISO 4957:** International tool steel standard - **Specialized Standards:** Often customer-specific requirements - **Quality Systems:** Typically requires ISO 9001 or equivalent --- ## **8. Technical Recommendations** ### **Selection Guidelines** **Choose M4 When:** - Abrasive wear is the **primary and dominant** failure mode - Materials contain **>15% abrasive constituents** - **All lower vanadium HSS grades** have failed prematurely - Tool life extension justifies **premium costs** - **Specialized grinding capabilities** are available - Application falls between **carbide and PCD** performance/cost **Consider Alternatives When:** - **Purely abrasive** non-ferrous materials (choose PCD) - **Very high volumes** of abrasive materials (choose PCD or ceramic) - **High temperatures** are primary concern (choose cobalt HSS or ceramic) - **Impact resistance** is equally important (choose lower vanadium HSS) - **Budget constraints** are severe (choose M3 Class 2 or carbide) ### **Application Best Practices** 1. **Conservative Start:** - Begin with very conservative parameters - Implement comprehensive tool monitoring - Gradual optimization based on performance 2. **Tool Design Optimization:** - Conservative geometries for edge strength - Optimized chip evacuation - Precision edge preparation 3. **Process Integration:** - Maximum machine rigidity - Advanced workholding - High-performance coolant systems ### **Economic Optimization** 1. **Total Cost Analysis:** Include all direct and indirect costs 2. **Performance Benchmarking:** Compare against all alternatives 3. **Life Cycle Management:** Comprehensive tool management 4. **Supplier Partnership:** Collaboration for optimization ### **Common Issues & Solutions** | Problem | Root Causes | Corrective Actions | |---------|-------------|-------------------| | **Catastrophic Edge Failure** | Excessive load on brittle edge | Reduce feed, improve edge prep, increase rigidity | | **Rapid Flank Wear** | Insufficient wear resistance | Verify material, consider PCD for extreme cases | | **Grinding Damage** | Improper technique | Use diamond wheels, adequate coolant, proper parameters | | **Thermal Cracking** | Excessive heat generation | Optimize parameters, improve coolant delivery | | **Inconsistent Performance** | Material or HT variations | Implement strict QC, batch testing | ### **Future Considerations** - **Advanced Alternatives:** Powder metallurgy HSS (ASP2060, etc.) - **Coating Advancements:** Enhanced PVD and CVD coatings - **Material Development:** New abrasive materials requiring new solutions - **Sustainability:** Recycling and life cycle considerations --- ## **Disclaimer** This technical datasheet provides comprehensive information about AISI Type M4 high-speed tool steel based on industry standards, technical literature, and extreme application experience. Actual properties and performance may vary significantly depending on multiple critical factors. **Critical Implementation Notes:** - M4 represents a **specialized extreme solution** for specific abrasive challenges - Success requires **comprehensive application engineering** - Performance must be **validated under actual conditions** - Requires **specialized processing capabilities** **Reference Standards:** - ASTM A600: Standard Specification for Tool Steel High Speed - ISO 4957: Tool steels - ASM Specialty Handbook: Tool Materials - Manufacturer's technical data and specialized guidelines This information represents current specialized knowledge. As technology evolves, users should: - Verify specifications with **specialized materials suppliers** - Conduct **extensive application-specific testing** - Consult with **abrasion and wear specialists** - Stay informed about **developments in wear-resistant materials** Always implement **comprehensive safety protocols** and adhere to all applicable standards and regulations. For mission-critical applications, engage **qualified materials engineering specialists** with specific abrasion expertise. -:- For detailed product information, please contact sales. -: AISI Type M4 Molybdenum High Speed Tool Steel (UNS T11304) Specification Dimensions Size： Diameter 20-1000 mm Length <6726 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. -: AISI Type M4 Molybdenum High Speed Tool Steel (UNS T11304) Properties -:- For detailed product information, please contact sales. -:

Applications of AISI Type M4 Molybdenum High Speed Tool Steel Tube (UNS T11304) -:- For detailed product information, please contact sales. -: Chemical Identifiers AISI Type M4 Molybdenum High Speed Tool Steel Tube (UNS T11304) -:- For detailed product information, please contact sales. -:

Packing of AISI Type M4 Molybdenum High Speed Tool Steel Tube (UNS T11304) -:- 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 Tube 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 3197 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