Bohler-Uddeholm,HOLDER Pre-hardened Holder Tool Steel Tube,Pipe

Bohler-Uddeholm HOLDER Pre-hardened Holder Tool Steel Tube Product Information -:- For detailed product information, please contact sales. -: Bohler-Uddeholm HOLDER Pre-hardened Holder Tool Steel Tube Synonyms -:- For detailed product information, please contact sales. -:

Bohler-Uddeholm HOLDER Pre-hardened Holder Tool Steel Product Information -:- For detailed product information, please contact sales. -: Here is a professional English introduction for Böhler-Uddeholm HOLDER Pre-hardened Holder Tool Steel, including the information you requested. --- ### **Böhler-Uddeholm HOLDER Pre-hardened Tool Steel for Die-Holding Applications** **Overview** Böhler-Uddeholm HOLDER is a premium-grade, pre-hardened tool steel specifically engineered for plastic mold frames, die-casting die holder plates, and general machine construction applications. It is supplied in a pre-hardened and stress-relieved condition, eliminating the need for further heat treatment by the customer and minimizing the risk of distortion. HOLDER is renowned for its excellent through-hardening properties, high compressive strength, good machinability, and superior dimensional stability, making it a reliable and cost-effective choice for robust tooling support structures. --- #### **1. Key Characteristics & Advantages** * **Pre-hardened & Stress-Relieved:** Supplied at a uniform hardness of approximately **300 HBW (32 HRC)**, ensuring high strength and stability directly from the mill. * **Excellent Through-Hardening:** Guarantees consistent mechanical properties throughout the entire cross-section, even in large block sizes. * **High Dimensional Stability:** Minimal risk of distortion during machining or in service due to the controlled manufacturing and stress-relieving process. * **Good Machinability:** Offers favorable machining performance in its pre-hardened state, reducing production time and tool wear. * **High Compressive Strength & Good Toughness:** Provides the necessary support to resist high clamping forces and cyclic loads in demanding die applications. * **Good Polishability and Nitridability:** Suitable for surfaces requiring a fine finish or enhanced wear resistance through surface treatments. --- #### **2. Typical Chemical Composition (Weight %)** | Element | Carbon (C) | Silicon (Si) | Manganese (Mn) | Chromium (Cr) | Molybdenum (Mo) | Vanadium (V) | | :--- | :---: | :---: | :---: | :---: | :---: | :---: | | **Content** | ~0.40 | ~0.30 | ~1.50 | ~1.90 | ~0.20 | ~0.10 | *Note: This is a typical composition. Exact values may vary slightly; please refer to the official material data sheet for precise specifications.* --- #### **3. Physical & Mechanical Properties** * **Hardness (Delivery Condition):** 280 - 320 HBW (approx. 30 - 34 HRC) * **Tensile Strength:** ~1000 MPa * **Yield Strength (0.2% offset):** ~800 MPa * **Elongation at Break:** ~12% * **Impact Strength (Charpy V):** ~35 J * **Modulus of Elasticity:** ~210 GPa * **Thermal Conductivity:** ~42 W/(m·K) at 20°C * **Density:** ~7.8 g/cm³ --- #### **4. Main Applications** HOLDER is primarily used for components that require high strength, stability, and wear resistance without the need for through-hardening to very high hardness levels. Typical applications include: * **Plastic Injection Molds:** Mold frames, backing plates, support plates, ejector housings. * **Die-Casting Dies:** Holder plates, bolster plates, backing plates. * **Stamping & Forming Tools:** Die shoes, punch holders, guide plates. * **General Machine Construction:** Bases, frames, fixtures, and other highly stressed structural components. --- #### **5. Relevant International Standards & Comparable Grades** Böhler-Uddeholm HOLDER corresponds to several common international standard grades. Below is a non-exhaustive comparison: | Standard | Grade / Designation | Similarity | | :--- | :--- | :--- | | **ISO 4957** | ~ **40CrMnMo7** (1.2311) | Very close match in composition and application. | | **DIN / Werkstoff Nr.** | **1.2311 / 40CrMnMo7** | Direct equivalent. | | **ASTM A681** | **P20 Modified** | Similar application and hardness, though P20 is often supplied at a lower hardness (~280-300 HBW). HOLDER can be considered a higher-strength variant. | | **JIS G4404** | **SCM440 Modified** | Similar chromium-molybdenum alloy construction steel. | | **UNS** | **G41400 (Modified)** | General correlating grade. | **Important:** While these grades are comparable, they are not always identical. The specific manufacturing process, cleanliness, and guaranteed properties of Böhler-Uddeholm HOLDER often provide superior performance and consistency. --- #### **6. Supply Form & Machining** * **Available Forms:** Blocks, slabs, round bars, and custom-cut near-net shapes. * **Machining:** Can be machined using standard techniques. It is recommended to use carbide or coated tools for optimal results. Stress-relieving after heavy machining or EDM is advisable for critical, high-precision applications. * **Heat Treatment:** **Not required** for its primary applications. If surface hardening is desired, nitriding is the recommended process. **Conclusion** Böhler-Uddeholm HOLDER represents a robust and reliable solution for tooling support structures. Its ready-to-use pre-hardened condition, excellent through-hardening capability, and balanced combination of strength and toughness ensure long service life, reduced lead times, and greater process security in demanding production environments. -:- For detailed product information, please contact sales. -: Bohler-Uddeholm HOLDER Pre-hardened Holder Tool Steel Specification Dimensions Size： Diameter 20-1000 mm Length <6871 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 HOLDER Pre-hardened Holder Tool Steel Properties -:- For detailed product information, please contact sales. -:

Applications of Bohler-Uddeholm HOLDER Pre-hardened Holder Tool Steel Tube -:- For detailed product information, please contact sales. -: Chemical Identifiers Bohler-Uddeholm HOLDER Pre-hardened Holder Tool Steel Tube -:- For detailed product information, please contact sales. -:

Packing of Bohler-Uddeholm HOLDER Pre-hardened Holder Tool 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 3342 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