Bohler-Uddeholm BÖHLER W302 ISOBLOC® H13 hot work tool steel

Bohler-Uddeholm BÖHLER W302 ISOBLOC® H13 hot work tool steel Product Information -:- For detailed product information, please contact sales. -: Bohler-Uddeholm BÖHLER W302 ISOBLOC® H13 hot work tool steel Synonyms -:- For detailed product information, please contact sales. -:

Bohler-Uddeholm BÖHLER W302 ISOBLOC® H13 hot work tool steel Product Information -:- For detailed product information, please contact sales. -: # **Böhler-Uddeholm BÖHLER W302 ISOBLOC® H13 Hot Work Tool Steel** ## **Product Overview** **BÖHLER W302 ISOBLOC®** is a premium-quality **chromium-molybdenum-vanadium alloyed hot work tool steel** conforming to AISI H13 specifications, manufactured under Böhler-Uddeholm's proprietary **ISOBLOC®** process. This advanced production technology ensures exceptional **microstructural homogeneity, minimized anisotropy, and superior dimensional stability** during heat treatment. Designed for demanding high-temperature applications, W302 ISOBLOC® delivers outstanding **thermal fatigue resistance, high-temperature strength (red hardness), and toughness**, making it the material of choice for critical die-casting, extrusion, and forging tools operating under severe thermal cycling conditions. --- ## **1. Key Characteristics & Advantages** * **Exceptional Thermal Fatigue Resistance:** Superior resistance to heat checking and thermal cracking caused by repeated heating and cooling cycles, extending die life significantly. * **High Temperature Strength (Red Hardness):** Maintains high hardness and mechanical strength at elevated operating temperatures (up to approximately 600°C / 1110°F). * **Excellent Toughness:** Provides high impact strength and fracture resistance at both room and elevated temperatures, crucial for withstanding mechanical shock in service. * **Superior Dimensional Stability:** The ISOBLOC® process minimizes directional properties (anisotropy), resulting in predictable, minimal distortion during heat treatment and uniform behavior in service. * **Good Wear Resistance at High Temperature:** Offers adequate resistance to erosion and soldering in aluminum and magnesium die-casting applications. * **Good Hardenability:** Can be through-hardened in substantial sections with consistent properties. * **Optimized Heat Treatment Response:** Provides a wide safety margin during hardening with reduced risk of quench cracking. --- ## **2. Typical Chemical Composition (Weight %)** | Element | Carbon (C) | Chromium (Cr) | Molybdenum (Mo) | Vanadium (V) | Silicon (Si) | | :--- | :---: | :---: | :---: | :---: | :---: | | **Content** | **0.37 - 0.42** | **4.80 - 5.50** | **1.20 - 1.50** | **0.90 - 1.10** | **0.90 - 1.10** | **Alloying Rationale:** * **Carbon (0.39%):** Balanced to provide a good combination of hardness, strength, and toughness after tempering. * **Chromium (5.2%) & Molybdenum (1.3%):** Provide hardenability, high-temperature strength, and resistance to softening (secondary hardening). Molybdenum specifically enhances toughness and reduces susceptibility to temper embrittlement. * **Vanadium (1.0%):** Forms stable carbides that increase wear resistance, refine grain size, and contribute significantly to secondary hardening and high-temperature strength. * **Silicon (1.0%):** Increases oxidation resistance and strengthens the ferrite matrix. * **ISOBLOC® Process:** This controlled manufacturing and heat treatment sequence ensures a fine, uniform carbide distribution and minimized segregation, directly contributing to the steel's isotropic properties and consistent performance. --- ## **3. Physical & Mechanical Properties** ### **Physical Properties:** * **Density:** ~7.80 g/cm³ * **Thermal Conductivity:** ~28 W/(m·K) at 20°C * **Modulus of Elasticity:** ~210 GPa * **Coefficient of Thermal Expansion:** ~11.5 x 10⁻⁶/K (20-500°C) * **Specific Heat Capacity:** ~460 J/(kg·K) ### **Heat Treatment & Mechanical Data:** * **Annealed Hardness:** ~210 HBW * **Austenitizing Temperature:** 1020 - 1050°C (1870 - 1920°F) * **Quenching Medium:** Air (forced air for larger sections) or oil (for complex shapes to minimize distortion risk). * **Tempering:** **Double tempering is essential.** Temperature range: 540 - 650°C (1005 - 1200°F). * **Typical Working Hardness:** **44 - 52 HRC** * **Die-Casting (Al/Zn):** 44-48 HRC (tempered at 580-620°C) for optimal thermal fatigue resistance. * **Extrusion/High Stress:** 48-52 HRC (tempered at 540-580°C) for higher strength and wear resistance. * **Hot Hardness:** Retains approximately 35-40 HRC at 600°C. * **Impact Toughness:** High, typically >30 J (Charpy U-notch) at 46 HRC. --- ## **4. Primary Applications** W302 ISOBLOC® is the industry benchmark for a wide range of hot work tooling applications: * **Die-Casting Dies:** * Cavities, cores, and inserts for **aluminum, magnesium, and zinc** die-casting. * Nozzles, goosenecks, and plunger tips. * **Hot Extrusion Tools:** * Dies, mandrels, and containers for extruding **aluminum, copper alloys, and steel**. * **Hot Forging Dies:** * Dies, punches, and inserts for **hammer and press forging** of steel and non-ferrous metals. * **Press Hardening (Hot Stamping) Tools:** For forming ultra-high-strength steel automotive components. * **Glass Mold Tools:** For molding glass containers and products. * **Plastic Molds:** For high-temperature engineering plastics or where superior thermal fatigue resistance is needed in hot runner systems. --- ## **5. Relevant International Standards & Comparable Grades** BÖHLER W302 ISOBLOC® is the premium variant of the globally recognized AISI H13 grade. | Standard | Grade / Designation | Country/Region | Similarity / Note | | :--- | :--- | :--- | :--- | | **AISI / ASTM A681** | **H13** | USA | Direct equivalent specification. W302 ISOBLOC® represents the premium quality tier. | | **DIN / Werkstoff Nr.** | **1.2344 / X40CrMoV5-1** | Germany / EU | Standard European designation. | | **JIS G4404** | **SKD61** | Japan | Primary Japanese equivalent. | | **ISO 4957** | **X40CrMoV5-1** | International | Corresponding ISO hot work steel grade. | | **GB/T 1299** | **4Cr5MoSiV1** | China | Common Chinese designation. | | **Uddeholm Proprietary** | **ORVAR® 2** | Uddeholm | Similar H13-type grade; W302 ISOBLOC® emphasizes isotropic properties via the specific ISOBLOC® process. | **Critical Distinction:** The **ISOBLOC®** designation is key, guaranteeing superior internal quality, homogeneity, and minimized directional properties compared to standard H13/SKD61/1.2344 material. --- ## **6. Processing & Fabrication Guidelines** * **Machining:** Good machinability in the annealed condition. Use sharp carbide tools with positive rake angles. The ISOBLOC® structure provides consistent chip formation and predictable tool wear. * **Heat Treatment:** 1. **Preheating:** Essential. Typically at 600-650°C and 850-900°C. 2. **Austenitizing:** In a controlled atmosphere or vacuum furnace to prevent decarburization. 3. **Quenching:** Air cooling is standard. For complex shapes, high-pressure gas quenching or oil quenching may be used to minimize stress. 4. **Tempering:** **Must be tempered at least twice,** immediately after quenching. The second temper should follow once the tool has cooled to room temperature after the first. * **Stress Relieving:** After rough machining, a stress relief at 600-650°C is highly recommended. * **Welding:** Repairs are common. Use matching or slightly softer hot work steel filler wires (e.g., Böhler UDDEHOLM WELDEX H13). * **Pre-heat:** 400-500°C. * **Post-Weld Heat Treatment:** Re-harden and temper to restore full properties in the heat-affected zone. * **Surface Treatment:** Often nitrided (gas, plasma, or salt bath) to dramatically increase surface hardness (>1000 HV), improving resistance to soldering, erosion, and wear in die-casting and extrusion. * **EDM:** Suitable. A low-temperature temper (e.g., 400-450°C) is recommended after EDM to relieve the stresses in the transformed white layer. --- ## **7. Conclusion** **BÖHLER W302 ISOBLOC®** represents the **pinnacle of H13 hot work tool steel technology**. By integrating the proven H13 chemistry with the advanced ISOBLOC® manufacturing process, it delivers unmatched consistency, reliability, and performance in the most punishing thermal cycling environments. Its superior isotropic properties ensure that complex dies behave predictably during heat treatment and in service, reducing the risk of distortion and premature failure. For die-casters, extruders, and forgers where maximizing tool life, minimizing unplanned downtime, and ensuring process stability are critical to profitability, the investment in W302 ISOBLOC® is justified by significantly extended production runs, improved part quality, and reduced maintenance costs. It is the definitive material of choice when failure is not an option. -:- For detailed product information, please contact sales. -: Bohler-Uddeholm BÖHLER W302 ISOBLOC® H13 hot work tool steel Specification Dimensions Size： Diameter 20-1000 mm Length <6893 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 W302 ISOBLOC® H13 hot work tool steel Properties -:- For detailed product information, please contact sales. -:

Applications of Bohler-Uddeholm BÖHLER W302 ISOBLOC® H13 hot work tool steel -:- For detailed product information, please contact sales. -: Chemical Identifiers Bohler-Uddeholm BÖHLER W302 ISOBLOC® H13 hot work tool steel -:- For detailed product information, please contact sales. -:

Packing of Bohler-Uddeholm BÖHLER W302 ISOBLOC® H13 hot work tool steel -:- 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 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 3364 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