JIS SKD62 Tool Steel Sheet,Plate

JIS SKD62 Tool Steel Sheet/Plate Product Information -:- For detailed product information, please contact sales. -: JIS SKD62 Tool Steel Sheet/Plate Synonyms -:- For detailed product information, please contact sales. -:

JIS SKD62 Tool Steel Product Information -:- For detailed product information, please contact sales. -: ### **Product Technical Datasheet: JIS SKD62 Chromium-Molybdenum Hot Work Tool Steel** --- #### **1. Product Overview** **JIS SKD62** is a **chromium-molybdenum-vanadium hot work tool steel** specified under the Japanese Industrial Standard (JIS) G 4404. It represents a **specialized, high-performance variant** within the 5% chromium hot work steel family, distinguished by a **significantly elevated carbon and vanadium content** compared to standard grades like SKD61. This composition is engineered to prioritize **exceptional wear resistance and high-temperature strength** for demanding applications, albeit at the potential cost of some toughness and thermal fatigue resistance. SKD62 is designed for hot work tools subjected to severe abrasive conditions and high thermal loads where deformation resistance is paramount. --- #### **2. International Standard Cross-Reference** SKD62 is a specialized Japanese grade without a *direct*, universally named equivalent in AISI. Its closest functional analogs are high-hardness, high-wear variants of the standard H13 composition. | Standard System | Equivalent / Similar Grade | Note | | :--- | :--- | :--- | | **JIS G 4404 (Japan)** | **SKD62** | Defining Standard | | **AISI (USA)** | **~H13 Mod / High-C H13** | Not a standard AISI designation; closest functional equivalent is a modified H13 with higher C and V. | | **DIN (Germany)** | **~1.2365 / X32CrMoV3-3** | Similar high-carbon, high-vanadium hot work concept. | | **BS (UK)** | **BH13 (Modified)** | - | | **ISO** | **~35CrMoV5-5** | Indicates higher vanadium variant. | | **GB (China)** | **4Cr5MoSiV1 (High C/V variant)** | Often referenced, but composition varies. | *Note: The most accurate way to specify this material is by the **JIS SKD62** designation and its specific chemical range.* --- #### **3. Chemical Composition (Typical, weight % per JIS G 4404)** The defining characteristic of SKD62 is its high carbon and vanadium levels within the 5% Cr-Mo matrix. | Element | Carbon (C) | Silicon (Si) | Manganese (Mn) | Chromium (Cr) | Molybdenum (Mo) | Vanadium (V) | | :--- | :--- | :--- | :--- | :--- | :--- | :--- | | **Content (%)** | 0.35 - 0.45 | 0.80 - 1.20 | 0.20 - 0.50 | 4.80 - 5.50 | 1.20 - 1.60 | 0.80 - 1.20 | **Function of Key Alloying Elements:** * **Carbon (0.35-0.45%):** **Higher than standard SKD61 (~0.32-0.40%).** Increases the volume of alloy carbides, significantly boosting **wear resistance and hot compressive strength**, but can reduce toughness. * **Vanadium (0.80-1.20%):** **Higher than standard SKD61 (~0.80-1.00%).** Forms a high volume of very fine, hard vanadium carbides (VC). This drastically improves **abrasion resistance, hot hardness, and grain refinement**. It is the primary driver of its superior wear properties. * **Chromium (4.80-5.50%) & Molybdenum (1.20-1.60%):** Provide excellent hardenability, high-temperature strength (red-hardness), oxidation resistance, and tempering resistance through secondary hardening. The molybdenum level is at the upper end for this class. --- #### **4. Physical & Mechanical Properties** * **Density:** ~7.80 g/cm³. * **Thermal Conductivity:** **Moderate to Low** (~28-30 W/m·K at 20°C). Similar to other 5% Cr steels; the high carbide volume can slightly impede heat transfer. * **Thermal Expansion Coefficient:** ~11.5 x 10⁻⁶ /K. * **Machinability (Annealed State):** **Fair to Poor.** The high volume of hard vanadium and chromium carbides makes it more abrasive and difficult to machine than standard SKD61. * **Grindability:** **Challenging.** Requires appropriate wheels and techniques. * **Hardenability:** **Excellent (Air-Hardening).** Maintains the deep hardening characteristics of the 5% Cr family. * **Key High-Temperature Properties:** * **Red Hardness & Hot Strength:** **Excellent.** The high carbide content provides outstanding resistance to deformation and softening at temperatures up to **600°C**. * **Tempering Resistance:** **Superior.** Exhibits a very pronounced secondary hardening peak in the **500-580°C** range due to the high vanadium content, allowing it to maintain high hardness after high-temperature tempering. * **Thermal Fatigue Resistance:** **Moderate.** While its hot strength is high, the increased carbide content and potentially lower fracture toughness compared to SKD61 can make it **more susceptible to heat-checking initiation and propagation** under severe thermal shock. * **Wear Resistance:** **Exceptional (for a hot work steel).** Its primary advantage over SKD61, making it suitable for highly abrasive conditions. * **Typical Working Hardness:** **48-52 HRC** (when tempered in the secondary hardening range, e.g., 550-600°C). It can be used at higher hardness (up to ~54 HRC) for maximum wear resistance in less shock-prone applications. --- #### **5. Heat Treatment Guidelines** * **Forging:** Heat slowly to **1100-1150°C**. Forge between **1050-900°C**. Cool very slowly. * **Annealing:** Heat to **850-880°C**, hold, then furnace cool very slowly to 500°C. Target hardness: ≤ 235 HB. * **Stress Relieving:** **650-750°C**. * **Hardening:** 1. **Preheating:** **Mandatory double preheat:** 550-650°C and 800-850°C. 2. **Austenitizing:** **1020-1050°C.** The high vanadium requires adequate temperature/time for solutioning but avoid excessive temperature to prevent grain growth. Soak: 20-30 min/inch. 3. **Quench:** **Still or forced air.** For complex shapes, high-pressure gas quenching is ideal. * **Tempering:** * **Immediate double or triple tempering is critical.** * Standard range: **550-600°C for 2+ hours, twice.** This maximizes secondary hardening, toughness, and dimensional stability. * For applications prioritizing extreme wear resistance over toughness, a lower temper (500-550°C) can be used. --- #### **6. Product Applications** SKD62 is selected for hot work applications where abrasive wear is the dominant failure mode, and thermal shock is manageable. * **High-Abrasion Die Casting:** **Cores, pins, and cavity inserts** for die-casting **high-silicon aluminum alloys, metal-matrix composites, or highly abrasive plastics.** Particularly for areas experiencing intense material flow and erosion. * **Hot Forging Dies & Inserts:** For forging **abrasive materials** (e.g., certain high-temperature alloys) or in areas of the die subject to extreme wear. * **Hot Extrusion Tools:** **Dies and liners** for extruding **highly abrasive alloys**, such as some copper-based materials or steel. * **Glass Mold Tools:** For pressing or forming glass where both heat and abrasion are concerns. * **Wear-Intensive Hot Work Tools:** General tooling where the service environment combines high heat with significant abrasive wear. --- #### **7. Advantages & Limitations** | Advantages | Limitations | | :--- | :--- | | • **Superior wear and abrasion resistance** among conventional hot work steels.
• **Exceptional hot hardness and resistance to deformation.**
• **Excellent tempering resistance and secondary hardening response.**
• **Good oxidation resistance.**
• **Maintains high hardness at elevated service temperatures.** | • **Reduced toughness and impact resistance** compared to standard SKD61/H13, increasing risk of chipping or catastrophic fracture under mechanical or thermal shock.
• **Potentially lower thermal fatigue resistance** due to higher carbide content and lower toughness.
• **More difficult to machine, grind, and polish.**
• **Higher cost** due to elevated alloy content.
• **Less forgiving** in terms of heat treatment and operational stresses. | --- #### **8. Selection Guidance: SKD62 vs. SKD61 (H13)** * **Choose SKD62 when:** The primary and unequivocal failure mode is **severe abrasive wear** (e.g., from fiber-filled materials, high-silicon aluminum), and the tool is **not subject to extreme mechanical or thermal shock**. It is a **specialist grade for wear-dominated problems**. * **Choose SKD61 (H13) when:** The application involves **significant thermal cycling, mechanical shock, or requires an optimal balance of toughness, thermal fatigue resistance, and wear resistance.** H13 is the **default, safer choice** for the vast majority of hot work applications. * **Trade-off:** Selecting SKD62 involves a conscious **trade-off: significantly improved wear resistance for a decrease in overall toughness and thermal shock resistance.** Its use should be justified by a clear wear-related failure analysis. **Conclusion:** JIS SKD62 is a **high-performance, wear-optimized hot work tool steel** that pushes the boundaries of the 5% chromium-molybdenum family. It is not a general-purpose grade but a **targeted solution for the most abrasive hot work environments**. By maximizing vanadium and carbon content, it delivers unmatched wear life in its class, but demands careful design, heat treatment, and application to mitigate its inherent brittleness. For tooling engineers facing chronic wear issues where standard H13 fails prematurely, SKD62 provides a powerful, **premium material upgrade**, but its successful implementation requires respect for its specific performance characteristics and limitations. -:- For detailed product information, please contact sales. -: JIS SKD62 Tool Steel Specification Dimensions Size： Diameter 20-1000 mm Length <6804 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. -: JIS SKD62 Tool Steel Properties -:- For detailed product information, please contact sales. -:

Applications of JIS SKD62 Tool Steel Sheet,Plate -:- For detailed product information, please contact sales. -: Chemical Identifiers JIS SKD62 Tool Steel Sheet,Plate -:- For detailed product information, please contact sales. -:

Packing of JIS SKD62 Tool 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 3275 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