Bohler-Uddeholm,BÖHLER K340 ISODUR® Premium Cold Work Steel Tube,Pipe

Bohler-Uddeholm BÖHLER K340 ISODUR® Premium Cold Work Steel Tube Product Information -:- For detailed product information, please contact sales. -: Bohler-Uddeholm BÖHLER K340 ISODUR® Premium Cold Work Steel Tube Synonyms -:- For detailed product information, please contact sales. -:

Bohler-Uddeholm BÖHLER K340 ISODUR® Premium Cold Work Steel Product Information -:- For detailed product information, please contact sales. -: # **Böhler-Uddeholm BÖHLER K340 ISODUR® Premium Cold Work Steel** ## **1. Product Overview** **BÖHLER K340 ISODUR®** is a high-performance, **air-hardening cold work tool steel** renowned for its exceptional combination of **high wear resistance, excellent dimensional stability, and superior toughness**. Manufactured under Böhler-Uddeholm's proprietary **ISODUR®** process, this steel features a highly isotropic microstructure that ensures uniform mechanical properties in all directions. This results in predictable performance, minimal distortion during heat treatment, and enhanced resistance to chipping and cracking in demanding applications. K340 ISODUR® represents a balanced alternative to conventional high-carbon, high-chromium steels (like D2), offering improved grindability and toughness without sacrificing wear resistance. It is supplied in soft-annealed condition and is particularly valued in precision tooling applications where reliability and consistency are critical. --- ## **2. Key Characteristics & Advantages** * **Superior Toughness:** Offers significantly higher toughness than conventional D2-type steels at comparable hardness levels, reducing the risk of chipping and catastrophic failure. * **Excellent Dimensional Stability:** The ISODUR® manufacturing process minimizes anisotropy, leading to minimal and predictable dimensional changes during heat treatment. * **High Wear Resistance:** Provides excellent resistance to abrasive wear, suitable for long-run production applications. * **Good Grindability:** Despite its high hardness potential, K340 exhibits favorable grinding characteristics, reducing processing time and cost. * **Air-Hardening:** Hardens in air with minimal risk of distortion or cracking, simplifying heat treatment for complex geometries. * **Uniform Microstructure:** The ISODUR® process ensures a consistent, fine carbide distribution, contributing to isotropic behavior and excellent polishability. * **Deep Hardening Capacity:** Suitable for larger cross-sections while maintaining consistent core properties. --- ## **3. Chemical Composition (Weight %)** | Element | Carbon (C) | Chromium (Cr) | Molybdenum (Mo) | Vanadium (V) | Manganese (Mn) | Silicon (Si) | | :--- | :---: | :---: | :---: | :---: | :---: | :---: | | **Content** | **1.10** | **8.30** | **2.10** | **0.50** | **0.40** | **0.90** | **Key Alloying Rationale:** * **Carbon & Chromium:** Form a high volume of hard chromium carbides (M₇C₃) for excellent wear resistance. * **Molybdenum:** Enhances hardenability, promotes secondary hardening during tempering, and refines grain structure. * **Vanadium:** Forms hard, fine vanadium carbides that increase wear resistance and inhibit grain growth. * **Manganese & Silicon:** Aid in deoxidation and contribute to hardenability. --- ## **4. Physical & Mechanical Properties** ### **Physical Properties:** * **Density:** 7.70 g/cm³ * **Thermal Conductivity:** ~25 W/(m·K) at 20°C * **Modulus of Elasticity:** ~210 GPa * **Coefficient of Thermal Expansion:** ~10.5 x 10⁻⁶/K (20-400°C) ### **Heat Treatment & Mechanical Data:** * **Soft Annealed Hardness:** ~230 HBW * **Austenitizing Temperature:** 1020 - 1060°C (1870 - 1940°F) * **Quenching:** Air (forced air for larger sections). * **Tempering Range:** 180 - 550°C (355 - 1020°F). **Double tempering is mandatory.** * **Achievable Hardness:** * 60 - 62 HRC (tempered at 180 - 200°C): Maximum wear resistance, high compressive strength. * 58 - 60 HRC (tempered at 400 - 450°C): Optimal combination of wear resistance and toughness. * 54 - 56 HRC (tempered at 500 - 540°C): High toughness for shock-resistant applications. * **Compressive Strength:** ~2,800 MPa (at 60 HRC) * **Impact Toughness:** Superior to standard AISI D2 at equivalent hardness. --- ## **5. Primary Applications** BÖHLER K340 ISODUR® is engineered for demanding cold work applications that benefit from its balanced property profile. * **Precision Blanking & Punching Dies:** For high-strength steel, electrical laminations, and automotive components. * **Forming & Drawing Dies:** Cold forming tools, deep drawing dies, and roll forming rolls. * **Shear & Slitter Knives:** Industrial knives for cutting sheet metal, plastics, and paper. * **Powder Compaction Tools:** Punches and dies for compacting metal and ceramic powders. * **Thread Rolling & Forming Dies:** For producing high-precision fasteners. * **Molding Applications:** Injection molds and inserts for abrasive plastics (e.g., filled polymers, fiberglass). * **Gauges & Precision Measuring Tools:** Where dimensional stability is paramount. * **Machine Components:** Wear-resistant parts like guide rails, cam plates, and ejector pins. --- ## **6. International Standards & Comparable Grades** K340 ISODUR® is a proprietary Böhler-Uddeholm grade with a specific chemistry. Its performance position it as a premium alternative to several common standards. | Standard | Grade / Designation | Similarity / Note | | :--- | :--- | :--- | | **AISI / ASTM** | **D2 (Modified)** | K340 has a similar Cr content but is optimized with Mo and lower V for better toughness and grindability. | | **DIN / Werkstoff** | **1.2379 (X155CrVMo12-1)** | Very close in composition. K340 can be considered a premium, isotropically processed version. | | **JIS** | **SKD11** | The Japanese equivalent of D2. K340 offers superior consistency and toughness. | | **ISO 4957** | **160CrMoV12** | Corresponding ISO designation for this class of steel. | | **Uddeholm Proprietary** | **SVERKER 21** | Similar application range; K340 offers enhanced isotropy via the ISODUR® process. | **Important Note:** The **ISODUR®** designation signifies a superior manufacturing process for achieving isotropic properties, which is not reflected in standard chemical composition classifications. Therefore, K340 ISODUR® should be specified by its proprietary name for guaranteed performance. --- ## **7. Processing & Fabrication Guidelines** * **Machining:** Can be readily machined in the soft-annealed condition using standard tool steel practices. Sharp carbide tools are recommended. * **Grinding:** Use aluminum oxide or CBN wheels with adequate cooling. The ISODUR® structure provides good grindability and allows for fine finishes. * **EDM (Electrical Discharge Machining):** Suitable. A stress-relieving temper is recommended after EDM to remove the affected "white layer." * **Heat Treatment:** **Must be performed in a controlled atmosphere or vacuum to prevent decarburization.** Preheating at 650°C and 850°C is crucial. Followed by austenitizing and air quenching. **Double tempering is essential** to achieve optimal properties and transform retained austenite. * **Surface Treatments:** An excellent substrate for PVD coatings (TiN, TiCN, AlCrN) and for nitriding to further enhance surface wear resistance. ## **8. Conclusion** **BÖHLER K340 ISODUR®** stands out as a premium, high-performance cold work steel that successfully bridges the gap between the extreme wear resistance of high-chromium steels and the need for greater toughness and reliability in precision tooling. Its isotropic properties, granted by the ISODUR® process, ensure predictable behavior, minimal distortion, and extended service life in the most demanding applications. For toolmakers and engineers seeking to upgrade from conventional D2/SKD11 or solve problems related to chipping and unpredictable tool failure, K340 ISODUR® provides a robust and technologically advanced solution that maximizes productivity and tool life. -:- For detailed product information, please contact sales. -: Bohler-Uddeholm BÖHLER K340 ISODUR® Premium Cold Work Steel Specification Dimensions Size： Diameter 20-1000 mm Length <6877 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 K340 ISODUR® Premium Cold Work Steel Properties -:- For detailed product information, please contact sales. -:

Applications of Bohler-Uddeholm BÖHLER K340 ISODUR® Premium Cold Work Steel Tube -:- For detailed product information, please contact sales. -: Chemical Identifiers Bohler-Uddeholm BÖHLER K340 ISODUR® Premium Cold Work Steel Tube -:- For detailed product information, please contact sales. -:

Packing of Bohler-Uddeholm BÖHLER K340 ISODUR® Premium Cold Work 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 3348 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