Latrobe,Double Six™ ASTM M2 High Speed Steel Foil/Strip

Latrobe Double Six™ ASTM M2 High Speed Steel Foil Product Information -:- For detailed product information, please contact sales. -: Latrobe Double Six™ ASTM M2 High Speed Steel Foil Synonyms -:- For detailed product information, please contact sales. -:

Latrobe Double Six™ ASTM M2 High Speed Steel Product Information -:- For detailed product information, please contact sales. -: # **Product Datasheet: Latrobe Double Six™ ASTM M2 High Speed Steel** ## **1. Product Overview** **Latrobe Double Six™ ASTM M2** is a premier, high-performance tungsten-molybdenum high-speed steel (HSS) representing the global industry standard for cutting tool applications. Manufactured under Latrobe's stringent quality controls, the "Double Six" designation signifies its capability to achieve and maintain a hardness of **66 HRC**—a benchmark for superior wear resistance and cutting edge integrity. As the most widely used HSS grade worldwide, M2 offers an optimal balance of high hardness, excellent wear resistance, good toughness, and reasonable cost, making it the universal choice for a vast range of cutting tools and wear components. ## **2. Key Advantages & Characteristics** * **Superior Hardness & Wear Resistance:** Achieves a nominal hardness of 64-66 HRC after proper heat treatment, providing exceptional resistance to abrasive wear and edge dulling. * **Excellent Red (Hot) Hardness:** Maintains cutting efficiency at elevated temperatures (up to approximately 540°C / 1000°F), a defining characteristic of high-speed steels. * **Good Toughness:** Offers better impact and shock resistance compared to higher-cobalt or high-vanadium super HSS grades, reducing chipping in interrupted cuts. * **Superior Grindability:** While demanding proper technique, it offers better grindability than higher-alloyed grades like M4 or M42, facilitating tool fabrication and sharpening. * **Exceptional Cost-to-Performance Ratio:** Delivers the best overall performance for the price, establishing it as the most economical choice for high-performance cutting. * **Proven Reliability & Consistency:** Latrobe's manufacturing ensures uniform carbide distribution and chemistry, guaranteeing batch-to-batch consistency. ## **3. Chemical Composition (ASTM A600 Specification)** ### **3.1 Standard Composition (wt.%)** | Element | ASTM M2 Range | Typical Double Six™ M2 Value | Metallurgical Function | | :--- | :--- | :--- | :--- | | **Carbon (C)** | 0.78 - 0.88 | 0.85 | Primary hardness; combines with carbide formers (W, Mo, V, Cr). | | **Tungsten (W)** | 5.50 - 6.75 | 6.40 | Primary contributor to hot hardness and wear resistance. | | **Molybdenum (Mo)** | 4.50 - 5.50 | 5.00 | Enhances hardenability and hot hardness; partly substitutes for tungsten. | | **Chromium (Cr)** | 3.75 - 4.50 | 4.10 | Provides hardenability and improves wear/oxidation resistance. | | **Vanadium (V)** | 1.75 - 2.20 | 2.00 | Forms extremely hard vanadium carbides (VC) for superior abrasion resistance. | | **Cobalt (Co)** | ≤ 0.50 | 0.25 (Residual) | (Not a primary alloy in standard M2; present in modified grades like M35 or M42). | | **Manganese (Mn)** | ≤ 0.40 | 0.30 | Deoxidizer and aids hardenability. | | **Silicon (Si)** | ≤ 0.40 | 0.25 | Deoxidizer. | | **Sulfur (S)** | ≤ 0.030 | 0.005 | Impurity control; can be enhanced for improved machinability (M2S). | | **Phosphorus (P)** | ≤ 0.030 | 0.015 | Impurity control. | ### **3.2 Latrobe Double Six™ Quality Enhancements** * **Carbide Uniformity:** Controlled solidification and hot working ensure fine, evenly distributed primary carbides, crucial for edge strength and grindability. * **Decarburization Control:** Tightly controlled processes minimize surface decarburization, preserving the full hardened cross-section. * **Consistent Response:** Predictable and uniform response to heat treatment. ## **4. Physical & Mechanical Properties** ### **A. Annealed Condition (Typical Delivery State)** * **Hardness:** 207 - 255 HB (Brinell) * **Microstructure:** Spheroidized carbides in a ferritic matrix, optimized for machinability. ### **B. Hardened & Tempered Condition (Properly Heat Treated)** * **Hardness:** **64 - 66 HRC** (Rockwell C) * **Transverse Rupture Strength:** ~ 3,500 - 4,100 MPa (varies with heat treatment and section size) * **Compressive Strength:** ~ 3,000 - 3,600 MPa * **Hot Hardness:** Retains ~ 58-60 HRC at **540°C (1000°F)**. * **Modulus of Elasticity:** ~ 215 - 225 GPa ### **C. Thermal Properties** * **Thermal Conductivity:** ~ 24 W/m·K (at 20°C) * **Coefficient of Thermal Expansion:** ~ 11.5 x 10^-6 /°C (20-100°C) * **Critical Temperatures:** Ac₁ ~ 815°C, Ac₃ ~ 870°C, M_s ~ 190°C ## **5. Heat Treatment Guidelines (Critical for Performance)** Proper heat treatment is essential to achieve the "Double Six" properties. **1. Preheating:** * **Stage 1:** 650 - 700°C (1200 - 1290°F) * **Stage 2:** 800 - 850°C (1470 - 1560°F) * *Soak time: 20-40 minutes per stage to ensure thermal equilibrium.* **2. Austenitizing:** * **Temperature:** **1190 - 1220°C (2175 - 2230°F)**. Precise control is critical. * **Atmosphere:** Salt bath, vacuum, or controlled atmosphere to prevent decarburization. * **Soak Time:** Short! Typically **2 - 5 minutes** after reaching temperature (depends on section size). Over-soaking causes grain growth and brittleness. **3. Quenching:** * **Medium:** Oil, salt bath (marquenching around 500-600°C), or high-pressure gas. * **Goal:** Rapid cooling to room temperature to form martensite. **4. Tempering (MANDATORY & MULTIPLE):** * **Temperature:** **540 - 570°C (1000 - 1060°F)**. This range triggers **secondary hardening**. * **Cycles:** **Minimum of 2 cycles**, with 3 cycles strongly recommended. Each cycle: 1-2 hours at temperature, air cool to room temperature between cycles. * **Result:** Tempering transforms retained austenite, relieves stresses, and precipitates fine alloy carbides, achieving peak hardness (64-66 HRC) and toughness. ## **6. International Standards & Specifications** * **ASTM A600:** Type M2 (Primary U.S. Standard) * **UNS:** T11302 * **ISO 4957:** **HS6-5-2** (International designation: 6%W, 5%Mo, 2%V) * **DIN / EN:** **1.3343** (German/European Material Number) * **JIS G4403:** **SKH51** (Japanese Standard) * **GB/T 9943:** **W6Mo5Cr4V2** (Chinese Standard) * **AMS:** 6497 (Aerospace Material Specification) ## **7. Product Applications** Latrobe Double Six™ M2 is the workhorse material for metal cutting tools across all industries. * **Cutting Tools (Primary Use):** * **Drills:** Twist drills, step drills, core drills, gun drills. * **End Mills:** General-purpose and high-performance end mills, slot drills. * **Taps & Dies:** Machine taps, hand taps, thread forming taps, threading dies. * **Reamers:** Chucking reamers, shell reamers, adjustable reamers. * **Broaches:** Surface and internal broaches. * **Gear Cutters:** Hobs, shaper cutters, shaving cutters. * **Saw Blades:** Metal cutting band saw and hacksaw blades. * **Turning Tools:** Single-point tools, form tools, inserts (brazed or clamped). * **Wear Parts & Forming Tools:** * **Punches & Dies:** For blanking, piercing, and forming. * **Shear Blades:** For cutting metal, plastic, or paper. * **Machine Components:** Wear plates, guide rails, cam followers, and bearings in high-wear applications. * **Knives:** For cutting non-metallic materials like plastics and composites. ## **8. Grinding & Machining Considerations** * **Grinding (Hardened State):** Use sharp, open-structure aluminum oxide (Al₂O₃) or cubic boron nitride (CBN) wheels. Use ample coolant to avoid "grinding burn" (local overheating and tempering). * **Machining (Annealed State):** Machinability is fair-to-difficult. Use carbide tooling with moderate speeds and feeds. Pre-hardening machining is standard practice. --- **Disclaimer:** This datasheet provides general information based on standard industry data for ASTM M2 high-speed steel. Optimal performance requires precise, component-specific heat treatment. For critical applications, **consultation with Latrobe's technical support team is strongly recommended** to ensure proper material selection and processing. **Latrobe Specialty Metals – Forging Performance Through Advanced Metallurgy.** -:- For detailed product information, please contact sales. -: Latrobe Double Six™ ASTM M2 High Speed Steel Specification Dimensions Size： Diameter 20-1000 mm Length <5331 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 Double Six™ ASTM M2 High Speed Steel Properties -:- For detailed product information, please contact sales. -:

Applications of Latrobe Double Six™ ASTM M2 High Speed Steel Foil -:- For detailed product information, please contact sales. -: Chemical Identifiers Latrobe Double Six™ ASTM M2 High Speed Steel Foil -:- For detailed product information, please contact sales. -:

Packing of Latrobe Double Six™ ASTM M2 High Speed Steel Foil/Strip -:- 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 Foil/Strip 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 1802 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