AISI Type M33 Molybdenum High Speed Tool Steel Tube,Pipe (UNS T11333)

AISI Type M33 Molybdenum High Speed Tool Steel Tube (UNS T11333) Product Information -:- For detailed product information, please contact sales. -: AISI Type M33 Molybdenum High Speed Tool Steel Tube (UNS T11333) Synonyms -:- For detailed product information, please contact sales. -:

AISI Type M33 Molybdenum High Speed Tool Steel (UNS T11333) Product Information -:- For detailed product information, please contact sales. -: # **Product Introduction: AISI Type M33 Cobalt-Enhanced Molybdenum High-Speed Tool Steel (UNS T11333)** ## **Overview** AISI Type M33 is a **cobalt-enhanced molybdenum high-speed steel (HSS)** within the AISI M-series, featuring a **moderate cobalt content (3.50-4.50%)** and a unique **tungsten-free composition**. This grade is engineered to provide **improved hot hardness and cutting performance** compared to standard M2, while offering better **grindability and toughness balance** than higher-cobalt grades. M33 represents a specialized solution for applications requiring enhanced high-temperature capability without the extreme processing challenges of tungsten-containing or high-cobalt grades. **Key Advantages:** - **Enhanced Hot Hardness:** Cobalt addition improves cutting edge retention at elevated temperatures - **Good Grindability:** Absence of tungsten and moderate vanadium content facilitate easier grinding - **Cost-Effective Performance:** Provides cobalt benefits without premium cost of high-cobalt grades - **Good Toughness Balance:** Maintains reasonable impact resistance for demanding applications - **Molybdenum-Dominated:** Economical alloying approach with good performance **Primary Considerations:** - Lower maximum hardness compared to some cobalt grades - Not suitable for extreme high-temperature applications (>600°C) - Requires careful heat treatment control - Limited availability compared to mainstream grades ## **International Designations & Standards** | Standard System | Designation | Note | |----------------|-------------|------| | **AISI/SAE (USA)** | M33 | Primary specification | | **UNS (USA)** | T11333 | Unified numbering system | | **ASTM (USA)** | A600 | High-Speed Tool Steel Standard | | **ISO (International)** | ~**HS2-9-2-5** | Similar composition (2%V-9%Mo-5%Co) | | **DIN (Germany)** | ~1.3246 | Cobalt-containing molybdenum HSS | | **JIS (Japan)** | ~SKH40 | Medium-cobalt molybdenum HSS | | **BS (UK)** | ~**BM33** | Cobalt-bearing molybdenum HSS | | **GB (China)** | ~**W2Mo9Cr4V2Co8** | Similar high-cobalt molybdenum grade | *Note: M33 represents a specialized tungsten-free cobalt HSS grade with specific performance characteristics, not as widely standardized as mainstream grades.* --- ## **1. Chemical Composition (Typical, Weight %)** M33 features a tungsten-free composition with significant cobalt and molybdenum content. | Element | Content (%) | Role & Metallurgical Effect | |---------|-------------|-----------------------------| | **Carbon (C)** | 0.85 - 0.95 | Provides matrix hardness and supports carbide formation. Slightly higher than M2 to balance cobalt effect. | | **Cobalt (Co)** | 3.50 - 4.50 | **Key performance element.** Enhances red hardness, improves thermal conductivity, promotes secondary hardening. | | **Molybdenum (Mo)** | 8.50 - 9.50 | **Primary carbide former.** Provides hot hardness through molybdenum carbide formation and solid solution strengthening. | | **Chromium (Cr)** | 3.50 - 4.25 | Standard level for hardenability and oxidation resistance. | | **Vanadium (V)** | 1.30 - 1.80 | Forms vanadium carbides for wear resistance. Moderate level balances wear and grindability. | | **Tungsten (W)** | ≤0.50 | Minimal content, essentially tungsten-free design | | **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. | **Composition Philosophy:** - **Tungsten-Free Design:** Relies entirely on molybdenum for hot hardness - **Moderate Cobalt:** Significant but not extreme cobalt addition - **Balanced Vanadium:** Provides wear resistance without excessive grindability penalty - **Higher Carbon:** Compensates for cobalt's effect on matrix hardness --- ## **2. Physical & Mechanical Properties** ### **Physical Properties** | Property | Typical Value | Conditions/Notes | |----------|---------------|------------------| | **Density** | 8.05 - 8.15 g/cm³ | At 20°C (68°F) - Lower than tungsten-containing HSS | | **Melting Range** | 1350 - 1400°C (2460 - 2550°F) | Lower melting point than tungsten HSS | | **Thermal Conductivity** | 25 - 30 W/m·K | At 20°C (68°F) - Improved by cobalt | | **Specific Heat Capacity** | 430 - 470 J/kg·K | At 20°C (68°F) | | **Coefficient of Thermal Expansion** | 10.8 - 11.8 × 10⁻⁶/K | 20-600°C (68-1110°F) range | | **Electrical Resistivity** | 0.50 - 0.60 μΩ·m | At 20°C (68°F) | | **Elastic Modulus** | 200 - 210 GPa (29.0 - 30.5 × 10⁶ psi) | At room temperature | | **Thermal Diffusivity** | 6.8 - 7.8 mm²/s | At 20°C (68°F) | ### **Mechanical Properties (Properly Heat-Treated)** | Property | Value Range | Heat Treatment Condition | |----------|-------------|--------------------------| | **Hardness (Annealed)** | 223 - 269 HB | Annealed condition | | **Hardness (Hardened)** | 64 - 67 HRC | Triple tempered condition | | **Hot Hardness (600°C)** | 55 - 58 HRC | After 4 hours at temperature | | **Transverse Rupture Strength** | 3100 - 3700 MPa (450 - 537 ksi) | At 65-66 HRC | | **Compressive Strength** | 3600 - 4200 MPa (522 - 609 ksi) | At 65-66 HRC | | **Impact Toughness (Charpy)** | 18 - 28 J (13 - 21 ft·lb) | At 65-66 HRC | | **Young's Modulus** | 200 - 210 GPa (29.0 - 30.5 × 10⁶ psi) | At room temperature | | **Fatigue Strength** | 700 - 850 MPa (102 - 123 ksi) | Rotating bending, 10⁷ cycles | ### **High-Temperature Performance** | Temperature | M33 Hardness (HRC) | vs M2 Advantage | Relative Cutting Performance | |-------------|---------------------|-----------------|------------------------------| | **20°C (68°F)** | 65-66 | +0.5-1.0 HRC | 105-110% | | **300°C (570°F)** | 60-62 | +1.0-2.0 HRC | 110-115% | | **450°C (840°F)** | 56-58 | +1.0-2.0 HRC | 115-120% | | **550°C (1020°F)** | 52-54 | +1.0-2.0 HRC | 115-125% | | **600°C (1110°F)** | 48-50 | +1.0-2.0 HRC | 110-120% | ### **Grindability Characteristics** - **Relative Grindability:** 90-100% (compared to M2 = 100%) - **Wheel Selection:** Standard aluminum oxide wheels suitable - **Power Requirement:** Similar to M2 - **Coolant Requirement:** Standard coolant systems adequate - **Surface Finish:** Good achievable finish with proper technique --- ## **3. Product Applications** ### **Primary Application Areas** **1. General Cutting Tools with Enhanced Performance:** - Drills for stainless steels and heat-resistant alloys - End mills for elevated temperature applications - Taps for difficult-to-machine materials - Reamers requiring consistent performance **2. Production Tools with Moderate Demands:** - Gear cutting tools for automotive applications - Broaches for production environments - Milling cutters for continuous operations - Form tools requiring extended life **3. Specialized Applications:** - Cutting tools for weldments and repair work - Tools for machining medium-hardness materials - Woodworking tools for production environments - Cutting tools requiring consistent performance over time ### **Industry Application Focus** | Industry | Typical M33 Applications | Performance Rationale | |----------|-------------------------|-----------------------| | **General Manufacturing** | Production drills, end mills | Extended tool life, reduced changeovers | | **Automotive Component** | Gear cutters, form tools | Consistent performance in warm conditions | | **Maintenance & Repair** | Cutting tools for various materials | Versatility with enhanced capability | | **Tool Room** | Specialized cutting tools | Balance of performance and grindability | | **Energy Sector** | Valve and component machining | Improved high-temperature capability | ### **Recommended Operating Parameters** | Work Material | Cutting Speed Range | Feed Range | Depth of Cut | Cooling Strategy | |---------------|---------------------|------------|--------------|------------------| | **Carbon Steels** | 40-60 m/min | 0.15-0.30 mm/rev | 1-5 mm | Standard coolant | | **Alloy Steels** | 30-50 m/min | 0.10-0.25 mm/rev | 1-4 mm | Enhanced coolant | | **Stainless Steels** | 25-45 m/min | 0.08-0.20 mm/rev | 0.5-3 mm | High-volume coolant | | **Cast Iron** | 45-70 m/min | 0.20-0.40 mm/rev | 1-6 mm | Dry or minimal coolant | | **Non-Ferrous** | 100-250 m/min | 0.20-0.50 mm/rev | 2-10 mm | Appropriate lubricant | --- ## **4. Heat Treatment Guidelines** ### **Annealing** - **Temperature:** 850-880°C (1560-1615°F) - **Soaking Time:** 2-4 hours - **Cooling Rate:** ≤15°C/hr to 540°C, then air cool - **Resulting Hardness:** 223-269 HB - **Atmosphere:** Protective atmosphere recommended ### **Stress Relieving** - **After Rough Machining:** 600-650°C (1110-1200°F), 1-2 hours - **After Grinding:** 500-550°C (930-1020°F), 1 hour - **Cooling:** Slow furnace cool or air cool ### **Hardening Process** 1. **Preheating (Critical):** - **First Stage:** 450-550°C (840-1020°F) - **Second Stage:** 800-850°C (1470-1560°F) 2. **Austenitizing:** - **Temperature:** 1190-1220°C (2175-2230°F) - **Soaking Time:** 2-5 minutes per 25mm thickness - **Atmosphere:** Controlled atmosphere or vacuum essential 3. **Quenching Options:** - **Oil Quench:** 40-80°C oil with good agitation - **Salt Bath Marquench:** 540-590°C, hold then air cool - **Air Cooling:** For simple shapes <25mm thickness ### **Tempering** - **Temperature:** 540-570°C (1000-1060°F) - **Cycles:** Minimum 3 tempers required - **Duration:** 1-2 hours per temper cycle - **Cooling:** Air cool completely between tempers - **Final Hardness:** 64-67 HRC ### **Sub-Zero Treatment** - **Recommendation:** Optional but beneficial - **Temperature:** -70 to -100°C (-95 to -150°F) - **Duration:** 2-4 hours - **Timing:** After quenching, before first temper - **Benefits:** Improved dimensional stability, maximum hardness --- ## **5. Manufacturing & Processing Characteristics** ### **Machinability (Annealed Condition)** - **Relative Machinability:** 45-55% (1% carbon steel = 100%) - **Tool Requirements:** Carbide tools recommended - **Cutting Parameters:** - Turning: 25-40 m/min (80-130 SFM) with carbide - Milling: 15-25 m/min (50-80 SFM) with carbide - Drilling: 8-15 m/min (25-50 SFM) with carbide - **Chip Control:** Use chip breakers for efficient machining - **Coolant:** Heavy-duty soluble oil or synthetic ### **Grinding Operations** - **Abrasive Selection:** Aluminum oxide A46-J8-V standard - **Wheel Speed:** 25-30 m/s (5000-6000 SFPM) - **Infeed Rates:** 0.005-0.020 mm/pass - **Crossfeed:** 1-5 mm/pass - **Coolant:** Water-based synthetic recommended - **Surface Finish:** Good achievable with proper technique ### **Surface Treatments** - **Recommended Coatings:** TiN, TiCN, TiAlN - **Coating Benefits:** 2-3x tool life improvement - **Pre-coating Preparation:** Edge honing 0.02-0.05mm radius - **Coating Thickness:** 2-4 microns optimal --- ## **6. Comparative Analysis** ### **vs. Other Cobalt HSS Grades** | Property | M33 | M30 | M35 | M42 | |----------|-----|-----|-----|-----| | **Cobalt Content** | 3.50-4.50% | 4.50-5.00% | 4.50-5.00% | 7.50-8.50% | | **Tungsten Content** | ≤0.50% | 1.30-2.30% | 5.50-6.75% | 1.15-1.85% | | **Hot Hardness** | Good | Good | Very Good | Excellent | | **Grindability** | Very Good | Good | Fair | Poor | | **Toughness** | Good | Fair-Good | Fair | Fair | | **Cost Factor** | 1.3x | 1.4x | 1.5x | 2.0x | ### **Performance Positioning** | Application Requirement | M33 Suitability | Better Alternatives | |------------------------|-----------------|-------------------| | **General Cutting with Cobalt Benefits** | Excellent | M30 for slightly better performance | | **Production Tools Requiring Grindability** | Very Good | M2 for cost-sensitive applications | | **Moderate High-Temperature Applications** | Good | M35 for better high-temp performance | | **Balanced Performance/Cost** | Very Good | M30 for similar performance profile | | **Severe High-Temperature** | Fair | M42 or M15 for extreme conditions | ### **Economic Analysis** - **Material Cost Premium:** 30-40% over M2 - **Tool Life Improvement:** 15-30% over M2 in appropriate applications - **Grinding Cost:** Similar to M2 - **Total Cost Benefit:** Positive when high-temperature performance needed - **ROI Period:** Typically 3-6 months in production environments --- ## **7. Quality Standards & Specifications** ### **Material Specifications** - **Chemical Composition:** Must meet AISI/ASTM ranges - **Decarburization:** Maximum 0.10mm per side - **Hardness Uniformity:** ±1.5 HRC acceptable - **Microstructure:** Uniform carbide distribution required - **Surface Quality:** Free from defects per ASTM standards ### **Testing Requirements** - **Chemical Analysis:** Full spectrographic analysis - **Hardness Testing:** Multiple points for consistency - **Microstructural Examination:** Carbide size and distribution - **Performance Testing:** Optional cutting tests for validation ### **Certification** - **Mill Test Certificates:** Standard requirement - **Heat Treatment Records:** Documentation of processing - **Traceability:** Full material traceability expected - **Compliance:** Meets ASTM A600 requirements --- ## **8. Technical Recommendations** ### **Selection Guidelines** **Optimal Applications for M33:** - Production cutting tools requiring consistent performance - Applications where M2 lacks sufficient hot hardness - Tools requiring reasonable grindability with cobalt benefits - Cost-sensitive applications needing better than M2 performance **Consider Other Grades When:** - Maximum high-temperature performance required (choose M42/M15) - Severe abrasion conditions (choose high-vanadium grades) - Extreme impact resistance needed (choose lower hardness grades) - Minimum cost is critical (choose M2 or M1) ### **Application Best Practices** 1. **Start with Conservative Parameters:** Begin at M2 levels, optimize upward 2. **Monitor Tool Performance:** Track wear patterns and tool life 3. **Implement Proper Maintenance:** Regular inspection and regrinding 4. **Use Appropriate Coolants:** Match coolant to application requirements ### **Limitations and Constraints** - **Temperature Limit:** Not for continuous use above 600°C - **Impact Sensitivity:** Avoid severe interrupted cuts - **Optimal Hardness Range:** 64-67 HRC for best performance - **Application Range:** Best for continuous or light-interrupted cutting ### **Troubleshooting Guide** | Problem | Possible Causes | Corrective Actions | |---------|----------------|-------------------| | **Premature Wear** | Insufficient hardness, improper coating | Verify heat treatment, apply appropriate coating | | **Edge Chipping** | Excessive feed, poor edge preparation | Reduce feed rates, improve edge honing | | **Poor Surface Finish** | Dull tool, improper geometry | Regrind tool, optimize geometry | | **Breakage** | Excessive load, vibration | Reduce cutting forces, improve rigidity | --- ## **Disclaimer** This technical datasheet provides comprehensive information about AISI Type M33 high-speed tool steel based on industry standards and typical applications. Actual properties and performance may vary depending on: 1. **Specific manufacturing processes** and quality control 2. **Exact heat treatment parameters** and execution 3. **Application conditions** and operating parameters 4. **Tool design** and manufacturing quality **Important Considerations:** - M33 represents a specialized grade with specific performance characteristics - Proper heat treatment is essential for achieving optimal properties - Application testing is recommended for critical applications - Consult with materials specialists for specific requirements **References and Standards:** - ASTM A600: Standard Specification for Tool Steel High Speed - ISO 4957: Tool steels - Manufacturer's technical datasheets and recommendations - Industry best practices for tool steel application This information is current as of the knowledge cutoff date and is subject to revision as technology and standards evolve. Always verify specifications with your materials supplier and conduct application-specific testing when required. -:- For detailed product information, please contact sales. -: AISI Type M33 Molybdenum High Speed Tool Steel (UNS T11333) Specification Dimensions Size： Diameter 20-1000 mm Length <6720 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 M33 Molybdenum High Speed Tool Steel (UNS T11333) Properties -:- For detailed product information, please contact sales. -:

Applications of AISI Type M33 Molybdenum High Speed Tool Steel Tube (UNS T11333) -:- For detailed product information, please contact sales. -: Chemical Identifiers AISI Type M33 Molybdenum High Speed Tool Steel Tube (UNS T11333) -:- For detailed product information, please contact sales. -:

Packing of AISI Type M33 Molybdenum High Speed Tool Steel Tube (UNS T11333) -:- 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 3191 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