Latrobe,Dynamax™ ASTM M42, DIN 1.3247 Super High Speed Steel Seamless tube

Latrobe Dynamax™ ASTM M42, DIN 1.3247 Super High Speed Steel Seamless tube Product Information -:- For detailed product information, please contact sales. -: Latrobe Dynamax™ ASTM M42, DIN 1.3247 Super High Speed Steel Seamless tube Synonyms -:- For detailed product information, please contact sales. -:

Latrobe Dynamax™ ASTM M42, DIN 1.3247 Super High Speed Steel Product Information -:- For detailed product information, please contact sales. -: ### **Product Datasheet: Latrobe Dynamax™ ASTM M42 / DIN 1.3247 Super High-Speed Steel** --- #### **1. Product Overview** **Latrobe Dynamax™** represents the pinnacle of conventional high-speed steel technology, meeting **ASTM A600 M42** and **DIN 1.3247** specifications. This ultra-premium **8% cobalt super high-speed steel (Super HSS)** is engineered for extreme performance in the most demanding machining applications. Dynamax™ delivers the **highest achievable red hardness and cutting edge retention** among standard HSS grades, enabling machining of exotic materials at near-carbide speeds while maintaining superior toughness compared to cemented carbides. It is the definitive choice where conventional HSS fails due to thermal softening. --- #### **2. Key Features & Benefits** * **Ultimate Red Hardness:** The high cobalt (8%) and carbon content provide exceptional resistance to thermal softening, maintaining cutting edge integrity above 600°C. * **Maximum Hardness Potential:** Capable of achieving 67-70 HRC – the highest hardness range of any commercial HSS grade – for outstanding wear resistance. * **Superior Hot Wear Resistance:** Exceptional performance in high-speed, high-feed operations on hardened steels, superalloys, and abrasive materials. * **Excellent Substrate for Coatings:** Its ultra-high base hardness makes it an ideal foundation for advanced PVD coatings, creating a synergistic effect for maximum tool life. * **Critical Performance Alternative:** Serves as a bridge between conventional HSS and carbide, offering better toughness and grindability than carbide for complex tool geometries. --- #### **3. Chemical Composition (Weight %)** Dynamax™ is manufactured to the exacting standards of M42 / 1.3247 with the following critical composition: | Element | ASTM M42 / DIN 1.3247 Range | Typical Dynamax™ Analysis | | :--- | :--- | :--- | | **Carbon (C)** | 1.05 - 1.15 | 1.10 | | **Cobalt (Co)** | 7.75 - 8.75 | 8.25 | | **Molybdenum (Mo)**| 9.00 - 10.00 | 9.50 | | **Tungsten (W)** | 1.15 - 1.85 | 1.50 | | **Chromium (Cr)** | 3.50 - 4.25 | 3.85 | | **Vanadium (V)** | 0.95 - 1.35 | 1.15 | | **Manganese (Mn)** | 0.15 - 0.40 | 0.25 | | **Silicon (Si)** | 0.15 - 0.40 | 0.30 | | **Sulfur (S)** | ≤ 0.03 | 0.010 | | **Phosphorus (P)** | ≤ 0.03 | 0.020 | --- #### **4. Physical & Mechanical Properties** **Physical Properties:** * **Density:** 8.00 g/cm³ (0.289 lb/in³) * **Melting Range:** ~1410–1440°C (2570–2624°F) * **Thermal Conductivity:** Higher than standard HSS due to significant cobalt content. * **Coefficient of Thermal Expansion:** ~11.8 × 10⁻⁶/K (20–400°C) **Mechanical Properties (Heat Treated):** * **Annealed Hardness:** ≤ 285 HB * **Hardened & Tempered Hardness:** **67 - 70 HRC** * **Transverse Rupture Strength:** ~3,200 – 3,600 MPa (Lower than lower-cobalt HSS due to high hardness, but exceptional for its hardness level) * **Key Characteristic:** Extreme secondary hardening response. Achieves peak hardness after multiple high-temperature tempers. --- #### **5. Critical Heat Treatment Guidelines** **Annealing:** Heat to 870–900°C (1600–1650°F), slow cool very gradually (≤ 15°C/h to 600°C). **Hardening (Requires Precise Control):** * **Preheating:** **Double preheat is essential.** First at 600–650°C, then at 850–900°C. * **Austenitizing:** 1170–1190°C (2140–2175°F). **Narrow range is critical** to avoid grain growth while dissolving sufficient carbides. * **Quenching:** Oil or salt bath. Air cooling is possible for simple shapes. * **Tempering:** **Triple tempering is mandatory.** Temper at 540–560°C (1005–1040°F) for 2+ hours each cycle. **Hardness will increase with each temper.** Cryogenic treatment between tempers is highly recommended to maximize transformation and dimensional stability. --- #### **6. Primary Applications** Dynamax™ is reserved for the most challenging applications: * **Machining Hardened Steels (45-65 HRC):** Drills, end mills, and boring tools for die & mold work and aerospace components. * **High-Temperature Alloys:** Tools for machining nickel-based (Inconel, Waspaloy) and cobalt-based superalloys. * **Abrasive & Work-Hardening Materials:** Tools for austenitic stainless steels, titanium alloys, and cast irons with abrasive scales. * **High-Speed Production:** Gear hobs and broaches where maximum productivity on tough materials is required. * **Precision Cutting Tools:** As a substrate for advanced coated tools used in CNC machining centers. --- #### **7. International Standards & Equivalents** **Primary Standards:** * **ASTM:** A600 M42 * **DIN / EN:** 1.3247 * **UNS:** T11342 **Cross-Reference Equivalents:** * **ISO:** HS2-9-1-8 * **JIS:** SKH59 * **AFNOR:** HS2-9-1-8 * **GB:** W2Mo9Cr4VCo8 (近似) * **Common Name:** "Super Cobalt HSS" or "M42 Cobalt" --- #### **8. Performance Comparison** * **vs. M2 / M35:** Vastly superior hot hardness and ability to machine harder materials. The definitive upgrade when thermal softening is the failure mode. * **vs. Other Super HSS (M41, M43):** Dynamax™ (M42) is the most widely recognized and utilized 8% Co grade, offering the best overall balance of properties in its class. * **vs. Carbide:** Offers superior toughness, impact resistance, and the ability to be ground into more complex geometries. Allows for regrinding. * **vs. PM-HSS:** While premium PM grades may offer better isotropy, Dynamax™ remains the benchmark for high-performance wrought cobalt HSS. --- #### **9. Available Forms & Processing Notes** * **Forms:** Precision ground stock, hot1rolled and cold-drawn bars, forgings. Often supplied in the annealed condition. * **Machining (Annealed State):** Difficult; requires sharp carbide tools with conservative parameters. * **Grinding:** **Challenging.** Requires friable aluminum oxide wheels (soft grade) or diamond/CBN wheels with low feed rates and **ample coolant** to prevent thermal cracking. * **Coatings:** The premier HSS substrate for all advanced PVD coatings (TiAlN, AlCrN, TiSiN). Coating adhesion is excellent due to the high base hardness. --- #### **10. Quality Assurance** * Produced via state-of-the-art melt practice with stringent control over carbide distribution and segregation. * Full traceability and certification to international standards. * Ultrasonic testing standard on critical sizes to ensure internal soundness. --- **Disclaimer:** Success with Dynamax™ is **highly dependent on correct heat treatment.** Improper processing will not yield its legendary properties. The information provided is for guidance. Latrobe strongly recommends technical consultation and process validation for critical applications. --- **LATROBE SPECIALTY METALS** *A CRS Holdings, Inc. Company* **Dynamax™: Defining the Limits of High-Speed Steel Performance** -:- For detailed product information, please contact sales. -: Latrobe Dynamax™ ASTM M42, DIN 1.3247 Super High Speed Steel Specification Dimensions Size： Diameter 20-1000 mm Length <5340 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 Dynamax™ ASTM M42, DIN 1.3247 Super High Speed Steel Properties -:- For detailed product information, please contact sales. -:

Applications of Latrobe Dynamax™ ASTM M42, DIN 1.3247 Super High Speed Steel Seamless tube -:- For detailed product information, please contact sales. -: Chemical Identifiers Latrobe Dynamax™ ASTM M42, DIN 1.3247 Super High Speed Steel Seamless tube -:- For detailed product information, please contact sales. -:

Packing of Latrobe Dynamax™ ASTM M42, DIN 1.3247 Super High Speed Steel Seamless tube -:- 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 Seamless 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 1811 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