AISI Type M44 Molybdenum High Speed Tool Steel Tube,Pipe (UNS T11344)

AISI Type M44 Molybdenum High Speed Tool Steel Tube (UNS T11344) Product Information -:- For detailed product information, please contact sales. -: AISI Type M44 Molybdenum High Speed Tool Steel Tube (UNS T11344) Synonyms -:- For detailed product information, please contact sales. -:

AISI Type M44 Molybdenum High Speed Tool Steel (UNS T11344) Product Information -:- For detailed product information, please contact sales. -: # **Product Introduction: AISI Type M44 Molybdenum High Speed Tool Steel (UNS T11344)** ## **Overview** AISI M44 (UNS T11344) is a premium-grade **cobalt-enriched molybdenum high-speed steel** belonging to the "super high-speed steel" category. Characterized by an exceptional combination of **ultra-high hardness**, **superior red-hardness**, and **excellent abrasion resistance**, M44 is engineered for the most demanding machining applications where standard high-speed steels (like M2 or M42) reach their performance limits. Its balanced chemistry provides optimal performance in severe cutting conditions involving high temperatures and abrasive materials. ## **1. Chemical Composition (Nominal %)** | Element | Content (%) | Primary Function | |---------|------------|------------------| | **Carbon (C)** | 1.10 - 1.20 | Provides matrix hardness and carbide formation | | **Tungsten (W)** | 5.00 - 5.75 | Enhances hot hardness and wear resistance | | **Molybdenum (Mo)** | 5.75 - 6.50 | Primary hardening element, improves hardenability | | **Chromium (Cr)** | 3.75 - 4.50 | Increases hardenability and wear resistance | | **Vanadium (V)** | 1.75 - 2.25 | Forms hard vanadium carbides for abrasion resistance | | **Cobalt (Co)** | 7.75 - 8.75 | **Critical element** - dramatically increases red-hardness and tempering resistance | | **Silicon (Si)** | 0.15 - 0.40 | Deoxidizer during steelmaking | | **Manganese (Mn)** | 0.15 - 0.40 | Improves hardenability and deoxidization | | **Sulfur (S)** | ≤ 0.03 | Residual element (controlled for purity) | | **Phosphorus (P)** | ≤ 0.03 | Residual element (controlled for purity) | | **Iron (Fe)** | Balance | Base metal | **Key Chemistry Note:** M44 features a **slightly lower vanadium** content compared to M43, which improves grindability while maintaining excellent wear resistance. The **balanced tungsten-molybdenum ratio** provides optimal carbide distribution for both toughness and hardness. ## **2. Physical & Mechanical Properties** | Property | Typical Value / Condition | |----------|--------------------------| | **Density** | 8.10 - 8.15 g/cm³ (0.293 lb/in³) | | **Melting Point** | Approximately 1415°C (2575°F) | | **Thermal Conductivity** | ~28 W/m·K at 20°C (relatively low, typical for high-alloy HSS) | | **Coefficient of Thermal Expansion** | 11.2 × 10⁻⁶/K (20-600°C) | | **Modulus of Elasticity** | 205-210 GPa (29.7-30.5 × 10⁶ psi) | | **Annealed Hardness** | 241-277 HB | | **Hardened & Tempered Hardness** | **66-69 HRC** (typically optimized at 67-68 HRC) | | **Red Hardness** | Maintains hardness up to **620°C (1150°F)** - superior to standard HSS grades | | **Abrasion Resistance** | **Excellent** - enhanced by vanadium carbides | | **Toughness** | **Moderate** - better than M43 due to lower carbon and vanadium content | | **Tempering Temperature Range** | 540-600°C (1000-1110°F), typically triple-tempered | ## **3. International Standards & Cross-References** | Standard | Designation | |----------|------------| | **UNS** | T11344 | | **AISI/ASTM (USA)** | M44 (ASTM A600) | | **ISO (International)** | **HS 7-5-2-8** (ISO 4957: Tool steels) | | **DIN (Germany)** | **1.3246** | | **JIS (Japan)** | **SKH58** (closest equivalent) | | **GB (China)** | **W7Mo5Cr4V2Co8** (approximate) | | **AFNOR (France)** | **HS 7-5-2-8** | | **SS (Sweden)** | **2728** | ## **4. Product Applications** ### **Primary Cutting Applications:** - **High-performance drills and end mills** for machining superalloys (Inconel, Hastelloy, Waspaloy) - **Premium taps and thread mills** for hard materials (hardened steels, stainless steels) - **Broaches and gear hobs** requiring extended tool life - **Form tools and cutters** for abrasive non-ferrous materials - **Single-point turning tools** for high-speed machining of high-temperature alloys ### **Specialized Applications:** - **Cold work tooling** requiring exceptional wear resistance (punches, dies) - **Blades for cutting composite and abrasive materials** - **High-temperature forming tools** - **Wear parts in severe service conditions** ### **Performance Advantage:** M44 offers **15-30% longer tool life** compared to standard cobalt HSS grades (like M35) when machining difficult materials, with **superior edge retention** at elevated temperatures. Its balanced chemistry provides better toughness than M43 while maintaining excellent hot hardness. ## **5. Processing & Heat Treatment Guidelines** ### **Forging:** - Heat uniformly to **1050-1150°C (1920-2100°F)** - Forge with moderate blows; do not forge below **925°C (1700°F)** - Cool slowly after forging (preferably in furnace or insulating medium) ### **Annealing:** - Heat to **840-870°C (1545-1600°F)**, hold sufficiently, then furnace cool slowly to **540°C (1000°F)** - Expected annealed hardness: 241-277 HB - Spheroidize anneal for best machinability ### **Hardening (Critical Process):** 1. **Preheat**: 800-850°C (1470-1560°F) - ESSENTIAL to prevent cracking 2. **Austenitize**: **1190-1220°C (2175-2225°F)** - temperature control is critical 3. **Quench**: In salt bath, oil, or controlled atmosphere furnace 4. **Cool to room temperature** before tempering ### **Tempering:** - **Immediate tempering** required after quenching - Temperature: **540-590°C (1005-1095°F)** - **Double or triple temper** (2 hours minimum per cycle) - Typical final hardness: 67-68 HRC ### **Stress Relieving:** - After rough machining: Heat to 650-675°C (1200-1245°F), hold 1-2 hours, slow cool ## **6. Machinability & Grindability** | Process | Relative Rating (Compared to M2 = 100%) | Notes | |---------|----------------------------------------|-------| | **Machinability (Annealed)** | 55-60% | More difficult than standard HSS due to hardness | | **Grindability** | 40-45% | Difficult - requires proper wheel selection and coolant | | **EDM Performance** | Good | Standard EDM parameters apply | **Grinding Recommendations:** Use aluminum oxide or CBN wheels with light cuts and ample coolant. Avoid burning which can cause micro-cracking. ## **7. Quality Assurance & Standards** - **Microcleanliness**: Typically supplied to ASTM E45 Method A with controlled inclusion ratings - **Decarburization**: Controlled per AMS 2301 or customer specifications - **Ultrasonic Testing**: Available for critical applications to detect internal flaws - **Hardness Uniformity**: Typically within ±1 HRC point across cross-section --- **Disclaimer:** The information provided is for reference purposes. Specific processing parameters and applications should be verified with the material supplier's technical data sheets and qualified metallurgical expertise. Performance characteristics may vary based on manufacturing processes, heat treatment, and application conditions. -:- For detailed product information, please contact sales. -: AISI Type M44 Molybdenum High Speed Tool Steel (UNS T11344) Specification Dimensions Size： Diameter 20-1000 mm Length <6730 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 M44 Molybdenum High Speed Tool Steel (UNS T11344) Properties -:- For detailed product information, please contact sales. -:

Applications of AISI Type M44 Molybdenum High Speed Tool Steel Tube (UNS T11344) -:- For detailed product information, please contact sales. -: Chemical Identifiers AISI Type M44 Molybdenum High Speed Tool Steel Tube (UNS T11344) -:- For detailed product information, please contact sales. -:

Packing of AISI Type M44 Molybdenum High Speed Tool Steel Tube (UNS T11344) -:- 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 3201 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