Assab Steel Sheet,Plates,8407 SUPREME Hot Work Steel Sheet,Plate

Assab Steel Sheet/Plates 8407 SUPREME Hot Work Steel Sheet/Plate Product Information -:- For detailed product information, please contact sales. -: Assab Steel Sheet/Plates 8407 SUPREME Hot Work Steel Sheet/Plate Synonyms -:- For detailed product information, please contact sales. -:

Assab Steels 8407 SUPREME Hot Work Steel Product Information -:- For detailed product information, please contact sales. -: ### **Assab Steels 8407 SUPREME: Premium Electro-Slag Remelted (ESR) Hot Work Tool Steel** --- #### **Introduction** Assab Steels 8407 SUPREME is a high-performance, chromium-molybdenum-vanadium (Cr-Mo-V) alloyed hot work tool steel. It is manufactured using the **Electro-Slag Remelting (ESR)** process, resulting in a steel with exceptional purity, homogeneity, and isotropic properties. These characteristics provide superior toughness, thermal fatigue resistance (resistance to heat checking), and consistent performance in all directions. 8407 SUPREME is specifically designed for demanding die-casting, hot forging, and extrusion applications where reliability and extended service life are critical. **Key Value Propositions:** * **Superior Toughness & Ductility:** The ESR process significantly reduces non-metallic inclusions, minimizing the risk of catastrophic failure and die cracking under high thermal and mechanical stress. * **Excellent Thermal Fatigue Resistance:** Outstanding resistance to the formation of heat-checking cracks caused by cyclic heating and cooling, a primary failure mode in hot work tools. * **High Thermal Conductivity:** Promotes rapid heat dissipation from the tool surface, reducing thermal gradients and stress. * **Good Wear Resistance & Hot Hardness:** Maintains sufficient hardness at elevated operating temperatures. * **Isotropic Properties:** Uniform mechanical and thermal properties in all directions due to the refined ESR structure, ensuring predictable performance. #### **International Standard Designations** * **Assab / Uddeholm:** 8407 SUPREME (ESR) * **AISI / ASTM A681:** H13 (Premium ESR Quality) * **European Norm (EN):** 1.2344 (X40CrMoV5-1-1) * **DIN:** X40CrMoV5-1 * **JIS:** SKD61 * **GB (China):** 4Cr5MoSiV1 #### **Chemical Composition (Typical Weight %)** | Element | Carbon (C) | Silicon (Si) | Chromium (Cr) | Molybdenum (Mo) | Vanadium (V) | Manganese (Mn) | | :--- | :---: | :---: | :---: | :---: | :---: | :---: | | **%** | 0.39 | 1.00 | 5.20 | 1.40 | 0.90 | 0.40 | *Note: This balanced composition provides an optimal blend of hot strength (Cr, Mo), wear resistance (V), and toughness.* #### **Physical & Mechanical Properties** * **Density:** 7.80 g/cm³ * **Thermal Conductivity:** 28.0 W/m·K (at 20°C) * **Coefficient of Thermal Expansion:** 11.5 x 10⁻⁶/K (20-200°C) * **Specific Heat Capacity:** 460 J/kg·K * **Elastic Modulus:** 210 GPa * **Typical Hardness in Use:** 44-52 HRC (Commonly used at 46-48 HRC for die casting, and 48-52 HRC for hot forging/extrusion dies). * **Hot Hardness:** Maintains high hardness levels at temperatures up to approximately 600°C. #### **Heat Treatment** * **Soft Annealed Hardness:** ~ 185 HB * **Stress Relieving (after rough machining):** 600-650°C * **Preheating:** Two-stage preheating at 650°C and 850°C is crucial to minimize thermal shock. * **Austenitizing Temperature:** 1020-1050°C (in vacuum or controlled atmosphere furnace). * **Quenching:** Forced air or high-pressure gas quenching (for minimal distortion). Oil quenching is possible for simpler geometries. * **Tempering:** **Double tempering is mandatory.** Temper immediately after quenching to 40-50°C above the intended service temperature. Typical tempering range: **540-650°C.** Hardness decreases with higher tempering temperatures, while toughness increases. #### **Product Applications** 8407 SUPREME is the industry benchmark for a wide range of hot work applications: 1. **High-Pressure Die Casting (Aluminum, Magnesium, Zinc):** * Cores and cavity inserts * Ejector pins, goosenecks, and shot sleeves * Particularly favored for aluminum die-casting due to its superior thermal fatigue resistance. 2. **Hot Forging & Pressing:** * Hammer forging dies * Press forging dies and inserts * Punches, mandrels, and headers for forging steel, brass, and titanium. 3. **Hot & Warm Extrusion:** * Extrusion dies and backers for aluminum and copper alloys. * Liners and dummy blocks. 4. **Plastic Molding (for abrasive/high-temperature plastics):** * Inserts for molding reinforced plastics (e.g., glass-filled). * Nozzles and hot runner components. #### **Available Forms** * ESR-quality billets, blocks, and rounds. * Precision ground flat stock. * Black-rolled or peeled and polished bars. * Custom pre-machined or semi-finished die sets and components. #### **Comparison Note: 8407 SUPREME vs. Conventional H13** The "SUPREME" designation and ESR process are key differentiators. Compared to standard air-melted H13/1.2344, 8407 SUPREME offers: * **Enhanced toughness and ductility** (up to 30% higher transverse impact strength). * **Superior polishability and texture transfer** due to fewer inclusions. * **More consistent and predictable performance** across large die sections. * **Longer tool life**, especially in applications prone to heat checking. #### **Conclusion** Assab Steels 8407 SUPREME is the premium choice for engineers and toolmakers who require the utmost reliability and performance from their hot work tooling. Its Electro-Slag Remelted quality delivers the critical combination of high thermal fatigue resistance and exceptional toughness that is essential for modern, high-productivity die-casting, forging, and extrusion operations. Investing in 8407 SUPREME translates directly into reduced downtime, fewer unscheduled die failures, and lower cost per produced part, solidifying its status as the supreme grade in the H13 steel category. -:- For detailed product information, please contact sales. -: Assab Steels 8407 SUPREME Hot Work Steel Specification Dimensions Size： Diameter 20-1000 mm Length <7240 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. -: Assab Steels 8407 SUPREME Hot Work Steel Properties -:- For detailed product information, please contact sales. -:

Applications of Assab Steel Sheet,Plates 8407 SUPREME Hot Work Steel Sheet,Plate -:- For detailed product information, please contact sales. -: Chemical Identifiers Assab Steel Sheet,Plates 8407 SUPREME Hot Work Steel Sheet,Plate -:- For detailed product information, please contact sales. -:

Packing of Assab Steel Sheet/Plates 8407 SUPREME Hot Work Steel Sheet/Plate -:- 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 Sheet/Plate 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 3711 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