Bohler-Uddeholm,BÖHLER S692/S693 MICROCLEAN® PM M4 High Speed Steel Tube,Pipe

Bohler-Uddeholm BÖHLER S692/S693 MICROCLEAN® PM M4 High Speed Steel Tube Product Information -:- For detailed product information, please contact sales. -: Bohler-Uddeholm BÖHLER S692/S693 MICROCLEAN® PM M4 High Speed Steel Tube Synonyms -:- For detailed product information, please contact sales. -:

Bohler-Uddeholm BÖHLER S692/S693 MICROCLEAN® PM M4 High Speed Steel Product Information -:- For detailed product information, please contact sales. -: # **Böhler-Uddeholm BÖHLER S692/S693 MICROCLEAN® PM M4 High Speed Steel** ## **Product Overview** **BÖHLER S692/S693 MICROCLEAN®** are premium **powder metallurgy (PM) high-speed steels** based on the AISI M4 chemistry, representing two distinct variants optimized through Böhler-Uddeholm's proprietary **MICROCLEAN®** manufacturing technology. This advanced PM process creates an ultra-fine, homogeneous microstructure with perfectly distributed carbides, eliminating the segregation and large carbide clusters inherent in conventional high-speed steel production. These grades deliver **exceptional wear resistance, high hot hardness, and superior grindability**, specifically engineered to bridge the performance gap between standard high-speed steels and more expensive super-high-speed steels. **Key Distinction: S692 vs. S693** * **S692:** The **standard high-performance variant**, offering an optimal balance of wear resistance and toughness for general demanding applications. * **S693:** An **enhanced wear resistance variant** with a higher carbon content, providing maximum abrasive wear resistance for the most severe cutting conditions, albeit with a slight compromise in toughness. --- ## **1. Key Characteristics & Advantages** * **Exceptional Wear Resistance:** Superior to conventional M4 and comparable to M42 in many applications, due to the fine, uniform distribution of hard vanadium carbides enabled by PM technology. * **Excellent Hot Hardness (Red Hardness):** Maintains cutting edge integrity at elevated temperatures (up to 550-600°C), typical of high molybdenum-vanadium high-speed steels. * **Superior Grindability:** Significantly better than conventional high-speed steels of similar wear resistance (especially S692), reducing manufacturing costs, shortening lead times, and lowering the risk of grinding burns or cracks. * **High Toughness:** Offers better toughness than conventionally produced steels of equivalent hardness and wear resistance, thanks to the homogeneous, segregation-free MICROCLEAN® microstructure. * **Isotropic Properties:** Uniform mechanical behavior in all directions, ensuring predictable performance in complex tool geometries (e.g., drills, end mills). * **Consistent Performance:** Batch-to-batch consistency in heat treatment response and cutting performance. * **Good Dimensional Stability:** Minimal and predictable distortion during hardening. --- ## **2. Chemical Composition (Weight %)** | Element | Carbon (C) | Tungsten (W) | Molybdenum (Mo) | Chromium (Cr) | Vanadium (V) | | :--- | :---: | :---: | :---: | :---: | :---: | | **S692** | **1.30 - 1.45** | **5.25 - 6.50** | **4.25 - 5.50** | **3.75 - 4.50** | **3.75 - 4.50** | | **S693** | **1.45 - 1.60** | **5.25 - 6.50** | **4.25 - 5.50** | **3.75 - 4.50** | **3.75 - 4.50** | **Alloying Rationale & PM Advantage:** * **High Vanadium (4.0%):** The key to wear resistance. Forms extremely hard vanadium carbides (VC). In conventional M4, these carbides can be large and clustered; the PM process refines them into a fine, uniform dispersion. * **High Carbon:** Balances the vanadium to form the hard carbides. S693's higher carbon further increases carbide volume for maximum wear resistance. * **Molybdenum & Tungsten (5-6% each):** Provide the classic high-speed steel matrix for hot hardness and secondary hardening. * **MICROCLEAN® Technology:** The gas atomization and hot isostatic pressing (HIP) process ensures: * No carbide networks or segregation. * Ultra-low oxygen and sulfur content. * A fine, spherical powder microstructure that translates to isotropic properties. --- ## **3. Physical & Mechanical Properties** ### **Physical Properties:** * **Density:** ~8.10 g/cm³ * **Thermal Conductivity:** ~24 W/(m·K) at 20°C * **Modulus of Elasticity:** ~215 GPa * **Coefficient of Thermal Expansion:** ~11.0 x 10⁻⁶/K (20-400°C) ### **Heat Treatment & Mechanical Data:** * **Soft Annealed Hardness:** ~260 HBW * **Austenitizing Temperature:** 1180 - 1220°C (2155 - 2230°F) * **Quenching Medium:** Salt bath, vacuum/pressurized gas (2-5 bar), or oil. * **Tempering:** **Multiple tempering cycles (2-3) are mandatory.** Temperature range: 540 - 580°C (1005 - 1075°F). * **Achievable Hardness:** * **S692:** **64 - 67 HRC** (Typically operated at 65-66 HRC) * **S693:** **65 - 68 HRC** (Typically operated at 66-67 HRC for max wear) * **Hot Hardness (600°C):** ~57-59 HRC * **Transverse Rupture Strength:** ~3200 - 3500 MPa * **Impact Toughness:** S692 > S693, but both are superior to conventional M4 at equivalent hardness. --- ## **4. Primary Applications** These steels are designed for high-performance cutting tools and demanding cold work applications requiring a superior balance of wear resistance, toughness, and grindability. * **High-Performance Cutting Tools:** * **End mills, drills, and reamers** for machining stainless steels, high-temperature alloys (Inconel), and hardened steels (45-55 HRC). * **Gear cutting tools** (hobs, shaper cutters) for hard finishing. * **Thread rolling dies** and form tools. * **Precision Cold Work Tooling:** * **Blanking and punching dies** for abrasive materials (electrical steel, high-strength steel). * **Cold forming punches and dies.** * **Powder compaction tools.** * **Industrial Knives & Wear Parts:** For cutting abrasive non-metallics or as wear-resistant components. --- ## **5. Relevant International Standards & Comparable Grades** S692/S693 are proprietary PM embodiments of the AISI M4 standard, with S693 being a high-carbon variant. | Standard | Grade / Designation | Similarity / Key Difference | | :--- | :--- | :--- | | **AISI / ASTM A600** | **M4 (Conventional & PM)** | S692/S693 are the premium PM MICROCLEAN® versions. S693 aligns with "M4 High Carbon". | | **ISO 4957** | **HS6-5-4** | The standard designation for this chemistry. | | **DIN / Werkstoff** | **1.3344 (HS6-5-4)** | The European standard grade. | | **JIS G4403** | **SKH54** | The Japanese M4 equivalent. | | **Other PM HSS** | **CPM M4** | The main competitor PM M4 grade. S692/S693 offer Böhler-Uddeholm's specific MICROCLEAN® quality and property balance. | | **Higher Alloy HSS** | **M42, A11 (T15)** | These are cobalt-bearing super HSS grades. S692/S693 offer superior wear resistance to M42 but lower hot hardness than cobalt grades. | **Selection Guide:** * **Choose S692** for applications requiring the best **overall balance of wear resistance, toughness, and grindability** (e.g., complex end mills, demanding drills). * **Choose S693** when **maximum abrasive wear resistance is the absolute priority** and some toughness can be sacrificed (e.g., certain form tools, severe blanking applications). --- ## **6. Processing & Fabrication Guidelines** * **Supply Form:** Round bars, square bars, and flat stock. * **Machining:** Must be machined in the soft-annealed condition. Use sharp carbide tools. The material is abrasive; expect higher tool wear than when machining lower-alloy steels. * **Grinding:** **Excellent grindability for their performance level**, especially S692. This is a key selling point. Use aluminum oxide or CBN wheels with ample coolant. * **EDM:** Suitable. A stress-relieving temper (~550°C) is recommended after EDM. * **Heat Treatment:** Requires precise, controlled atmosphere or vacuum heat treatment. 1. **Preheating:** 800-850°C and 1050-1100°C is critical. 2. **Austenitizing:** High temperature requires precise control. 3. **Quenching:** Pressurized gas quenching is preferred for complex tools to minimize distortion. 4. **Tempering:** **Triple tempering is standard practice.** Cryogenic treatment (-196°C) between tempers is highly beneficial for maximizing hardness and dimensional stability. * **Surface Treatment:** Excellent substrates for PVD coatings (TiAlN, AlCrN). The combination provides a synergistic effect for high-performance cutting tools. --- ## **7. Conclusion** **BÖHLER S692/S693 MICROCLEAN®** represents the **optimal modernization of the classic M4 high-speed steel**, leveraging powder metallurgy to overcome its traditional limitations. They deliver performance that often matches or exceeds more expensive cobalt-bearing grades for wear-centric applications, while maintaining significantly better grindability and toughness. For tool manufacturers seeking to upgrade from conventional M2, M35, or even M42 steels due to wear issues—but who are challenged by the grinding difficulties of conventional M4 or high-vanadium steels—the S692/S693 MICROCLEAN® grades offer a compelling solution. They provide a direct path to longer tool life and higher productivity in demanding machining and cold work operations, combining the proven M4 alloy design with the processing and performance benefits of state-of-the-art PM technology. The choice between S692 and S693 allows precise tuning of properties to match the specific failure mode of the application. -:- For detailed product information, please contact sales. -: Bohler-Uddeholm BÖHLER S692/S693 MICROCLEAN® PM M4 High Speed Steel Specification Dimensions Size： Diameter 20-1000 mm Length <6901 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. -: Bohler-Uddeholm BÖHLER S692/S693 MICROCLEAN® PM M4 High Speed Steel Properties -:- For detailed product information, please contact sales. -:

Applications of Bohler-Uddeholm BÖHLER S692/S693 MICROCLEAN® PM M4 High Speed Steel Tube -:- For detailed product information, please contact sales. -: Chemical Identifiers Bohler-Uddeholm BÖHLER S692/S693 MICROCLEAN® PM M4 High Speed Steel Tube -:- For detailed product information, please contact sales. -:

Packing of Bohler-Uddeholm BÖHLER S692/S693 MICROCLEAN® PM M4 High Speed Steel 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 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 3372 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