Bohler-Uddeholm,ROLTEC SF Cold Work Tool Steel Wire

Bohler-Uddeholm ROLTEC SF Cold Work Tool Steel Wire Product Information -:- For detailed product information, please contact sales. -: Bohler-Uddeholm ROLTEC SF Cold Work Tool Steel Wire Synonyms -:- For detailed product information, please contact sales. -:

Bohler-Uddeholm ROLTEC SF Cold Work Tool Steel Product Information -:- For detailed product information, please contact sales. -: # **Böhler-Uddeholm ROLTEC SF Cold Work Tool Steel** ## **Product Overview** **Böhler-Uddeholm ROLTEC SF** is a proprietary, high-performance **sintered and forged powder metallurgy (PM) cold work tool steel** engineered to deliver exceptional wear resistance, toughness, and dimensional stability. The "SF" designation stands for "Sintered & Forged," representing a unique manufacturing process where the material is first produced via powder metallurgy to achieve a homogeneous, fine carbide structure, then subsequently hot-forged to enhance density and mechanical properties. This advanced processing results in a material with **near-isotropic behavior, outstanding grindability, and superior performance in demanding applications** compared to conventional high-alloy tool steels like D2. --- ## **1. Key Characteristics & Advantages** - **Exceptional Wear Resistance:** Superior to conventional D2 and high-vanadium steels due to an ultra-fine, uniform dispersion of hard vanadium carbides. - **High Toughness:** Offers significantly better impact and shock resistance than conventional steels at equivalent hardness levels, reducing the risk of chipping and fracture. - **Excellent Dimensional Stability:** Minimal and predictable size change during heat treatment, critical for precision tooling and complex geometries. - **Superior Grindability:** The fine carbide structure allows for efficient grinding with reduced risk of cracking or burning, even at high hardness levels. - **Near-Isotropic Properties:** The sintered and forged process ensures consistent mechanical properties in all directions, enabling predictable tool performance. - **Good Polishability:** Capable of achieving high surface finishes, suitable for precision forming and molding applications. - **Deep Hardenability:** Can be uniformly through-hardened in substantial cross-sections. --- ## **2. Typical Chemical Composition (Weight %)** | Element | Carbon (C) | Chromium (Cr) | Molybdenum (Mo) | Vanadium (V) | Tungsten (W) | | :--- | :---: | :---: | :---: | :---: | :---: | | **Content** | **2.30** | **6.50** | **2.50** | **6.50** | **-¹** | **Alloying Rationale:** - **Carbon (2.30%) & Vanadium (6.50%):** The core of ROLTEC SF's performance. Form an extremely high volume of ultra-hard vanadium carbides (VC) for maximum abrasion resistance. - **Chromium (6.50%) & Molybdenum (2.50%):** Provide secondary hardening, increase hardenability, and contribute to wear resistance and toughness. - **Advanced PM+S+F Process:** The powder metallurgy base ensures carbide homogeneity, while the subsequent forging step refines the microstructure and eliminates residual porosity, enhancing density and mechanical integrity. *¹: Some product data sheets may list a nominal tungsten content; refer to official specifications for the exact variant.* --- ## **3. Physical & Mechanical Properties** ### **Physical Properties:** - **Density:** ~7.6 - 7.7 g/cm³ - **Thermal Conductivity:** ~22 W/(m·K) at 20°C - **Modulus of Elasticity:** ~210 GPa - **Coefficient of Thermal Expansion:** ~10.2 x 10⁻⁶/K (20-400°C) ### **Heat Treatment & Mechanical Data:** - **Soft Annealed Hardness:** ~280 HBW - **Austenitizing Temperature:** 1100 - 1160°C (2010 - 2120°F) - **Quenching Medium:** Salt bath, oil, or pressurized gas. - **Tempering Range:** 500 - 550°C (930 - 1020°F). **Triple tempering is strongly recommended.** - **Achievable Hardness:** **64 - 68 HRC** - *64-66 HRC (tempered at 525-540°C):* Optimal balance of wear resistance and toughness for most applications. - *66-68 HRC (tempered at 500-520°C):* Maximum wear resistance for extreme abrasion. - **Transverse Rupture Strength:** >3500 MPa (at 65 HRC) - **Impact Toughness (Charpy C):** Typically 2-3 times higher than conventional D2 at equivalent hardness. --- ## **4. Main Applications** ROLTEC SF is designed for the most demanding cold work applications where both extreme wear and high toughness are required. - **High-Volume Precision Blanking & Punching:** Progressive dies for electrical steel laminations, high-strength automotive steels, and abrasive composites. - **Cold Forming & Extrusion:** Punches, dies, and inserts for forming hard metals and alloys. - **Powder Compaction Tools:** Critical components for pressing hard metal and ceramic powders. - **Shear Blades & Industrial Knives:** For cutting advanced composites, fiberglass, and abrasive non-metallics. - **Thread Rolling & Forming Dies:** For high-precision, long-run fastener production. - **Precision Rolls & Wear Parts:** Rolls for cold rolling abrasive strips, and wear plates in severe environments. - **Molding Inserts:** For highly abrasive plastics (e.g., heavily filled polymers, fiber-reinforced plastics). --- ## **5. Relevant International Standards & Comparable Grades** As a proprietary sintered and forged PM grade, ROLTEC SF does not have a direct standardized equivalent. Its performance positions it among the top tier of high-vanadium PM tool steels. | Category | Standard / Supplier | Comparable Grade | Key Performance Comparison | | :--- | :--- | :--- | :--- | | **PM Tool Steel** | **Uddeholm Proprietary** | **VANADIS 10** | ROLTEC SF offers similar or superior wear resistance with potentially enhanced toughness and grindability. | | **PM Tool Steel** | **Böhler Proprietary** | **K890** | Similar ultra-high wear resistance class. ROLTEC SF's S+F process may offer microstructural advantages. | | **PM Tool Steel** | **Crucible (CPM)** | **CPM 10V** | Comparable high-vanadium concept. ROLTEC SF typically offers better toughness and grindability. | | **Conventional Steel** | **AISI** | **D2** | **Not equivalent.** ROLTEC SF provides dramatically superior wear resistance (5-10x) and significantly higher toughness. | **Designation Note:** It is most accurate to specify the material as **"ROLTEC SF"** or describe it as a **"Sintered & Forged PM High-Vanadium Cold Work Tool Steel."** --- ## **6. Supply Form & Processing** - **Available Forms:** Blocks, round bars, and custom pre-machined blanks. - **Machining:** Must be machined in the soft-annealed condition. Use rigid setups and sharp carbide tools. Its abrasiveness accelerates tool wear; proper parameters are essential. - **Grinding:** **Excellent grindability for its hardness class.** Use aluminum oxide or CBN wheels with ample coolant. The fine structure reduces the risk of grinding cracks. - **EDM:** Suitable. A stress-relieving temper is required after EDM to remove the transformed surface layer. - **Heat Treatment:** Requires precise, controlled atmosphere or vacuum heat treatment. **Triple tempering is critical** to achieve full secondary hardening, transform retained austenite, and ensure dimensional stability. Cryogenic treatment is highly beneficial. - **Surface Treatment:** An excellent substrate for advanced PVD coatings (TiAlN, AlCrN) to further enhance performance. --- ## **7. Conclusion** **Böhler-Uddeholm ROLTEC SF** represents a significant technological advancement in tool steel manufacturing, combining the **carbide homogeneity of powder metallurgy with the densification and grain refinement of forging**. This unique Sintered & Forged process yields a material that breaks the traditional wear-toughness compromise, offering exceptional performance where conventional steels fail. It is the ultimate choice for applications plagued by both severe abrasive wear and high mechanical stress, where tool life extension and reliability are paramount. While representing a premium investment, ROLTEC SF delivers substantial economic return through dramatically extended service life, reduced unplanned downtime, and the ability to machine and finish with greater confidence and efficiency. For the most challenging cold work applications, it provides a definitive, high-performance solution. -:- For detailed product information, please contact sales. -: Bohler-Uddeholm ROLTEC SF Cold Work Tool Steel Specification Dimensions Size： Diameter 20-1000 mm Length <6886 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 ROLTEC SF Cold Work Tool Steel Properties -:- For detailed product information, please contact sales. -:

Applications of Bohler-Uddeholm ROLTEC SF Cold Work Tool Steel Wire -:- For detailed product information, please contact sales. -: Chemical Identifiers Bohler-Uddeholm ROLTEC SF Cold Work Tool Steel Wire -:- For detailed product information, please contact sales. -:

Packing of Bohler-Uddeholm ROLTEC SF Cold Work Tool Steel Wire -:- 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 Wire 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 3357 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