InduSteel Sheet,Plate,Superplast® 350 Mold Steel Sheet,Plate

InduSteel Sheet/Plate Superplast® 350 Mold Steel Sheet/Plate Product Information -:- For detailed product information, please contact sales. -: InduSteel Sheet/Plate Superplast® 350 Mold Steel Sheet/Plate Synonyms -:- For detailed product information, please contact sales. -:

Industeel Superplast® 350 Mold Steel Product Information -:- For detailed product information, please contact sales. -: # **Product Introduction: Industeel Superplast® 350 Mold Steel** ## **1. Overview** **Industeel Superplast® 350** is a premium-grade **prehardened, through-hardening chromium-molybdenum alloy steel** designed as a versatile, high-performance material for plastic injection molds and general tooling applications. Supplied in a **quenched and tempered (prehardened) condition** with a guaranteed hardness of approximately **350 HB (36-38 HRC)**, it occupies a strategic position between standard P20-type steels (300 HB) and higher-hardness specialty grades. Superplast® 350 offers an optimal balance of **enhanced wear resistance, good toughness, excellent machinability, and superior polishability**, making it an ideal choice for medium-to-large production molds requiring extended service life, high-quality surface finishes, and reliable performance with engineering plastics and abrasive compounds. ## **2. International Standards & Specifications** Superplast® 350 is a proprietary grade engineered to deliver consistent performance beyond standard prehardened mold steel classifications. * **Primary Manufacturer Standard:** * **Industeel Superplast® 350:** Proprietary specification defining this intermediate-hardness prehardened mold steel. * **Material Classification & Comparative Grades:** * **Type:** **Enhanced Prehardened Chromium-Molybdenum Alloy Steel** (P20+/H11 Modified Type). * **Performance Benchmark:** Bridges the gap between standard **DIN 1.2311/1.2738 (~300 HB)** and high-hardness grades like **Superplast® 400 (~400 HB)** or prehardened H13 variants. Offers a 15-20% increase in yield strength over standard P20. * **International Equivalents (Conceptual Similarity):** * **Premium P20+Ni at Elevated Hardness:** Certain high-quality 1.2738 grades can be supplied at ~350 HB. * **Modified H11/H13 Prehardened:** Some manufacturers offer hot work steel derivatives in prehardened conditions at similar hardness. * **Proprietary Intermediate Grades:** Such as **Uddeholm IMPAX Hi-Hard** or similar performance-tier steels. * **ISO 4957:** Would fall under alloy steel classifications (e.g., 35CrMo2 modified) but represents a specialized composition and heat treatment. ## **3. Chemical Composition (Weight %, Typical)** The composition is optimized for increased hardenability and tempering resistance while maintaining excellent machinability. | Element | Typical Range (%) | Role & Benefit | |---------|------------------|----------------| | **Carbon (C)** | 0.35 – 0.42 | Provides core strength and hardness. Slightly elevated compared to standard P20 to achieve the target 350 HB hardness while maintaining good toughness. | | **Chromium (Cr)** | 1.80 – 2.10 | Enhances hardenability for uniform through-thickness properties and provides mild wear/corrosion resistance. | | **Molybdenum (Mo)** | 0.30 – 0.50 | **Increased content** (vs. standard P20). Critical for achieving higher hardenability, improving toughness, and enhancing tempering resistance. | | **Vanadium (V)** | 0.05 – 0.15 | Added for grain refinement and to contribute to secondary hardening, improving wear resistance. | | **Nickel (Ni)** | 0.70 – 1.10 (May be present) | Often included to significantly enhance **core toughness and impact strength** at the elevated hardness level, a key performance feature. | | **Manganese (Mn)** | 1.20 – 1.60 | Aids in hardenability and strength. | | **Silicon (Si)** | 0.20 – 0.40 | Deoxidizer and solid solution strengthener. | | **Sulfur (S)** | ≤ 0.005 (Ultra-Low) | Kept extremely low to ensure excellent **weldability, polishability, and isotropic toughness**. | ## **4. Typical Physical & Mechanical Properties (As Prehardened)** * **Delivery Condition:** Quenched and tempered at the mill, ready for machining. * **Guaranteed Hardness:** **340 – 370 HB (36 – 39 HRC)** – Uniform throughout large cross-sections (typically up to 1000mm thickness). * **Tensile Strength:** 1150 – 1300 MPa (167,000 – 188,000 psi) * **Yield Strength (0.2% Offset):** 1000 – 1150 MPa (145,000 – 167,000 psi) – **Approximately 20% higher than standard 300 HB P20.** * **Elongation:** ≥ 10% (in 50mm) * **Impact Toughness (Charpy V-Notch):** **≥ 25 J (18 ft-lb) at room temperature** – **Very good for its hardness level**, a direct benefit of the optimized alloy design (e.g., potential Ni addition). * **Machinability:** **Very Good.** More demanding than 300 HB steels but offers excellent machinability for its hardness. Requires sharp carbide tools and appropriate parameters. Rated ~70-75% of 1% carbon steel. * **Polishability:** **Excellent.** The ultra-low sulfur content and homogeneous microstructure enable the achievement of high surface finishes (SPI #A2-A3) and good texture replication. * **Weldability:** **Good.** Requires standard procedures for prehardened steels: preheat (300-350°C), low-hydrogen electrodes, and post-weld stress relief. More forgiving than 400 HB grades. * **Dimensional Stability:** **Excellent.** Exhibits minimal distortion during machining due to its stable, tempered martensitic structure. * **Physical Properties:** * **Density:** 7.85 g/cm³ * **Modulus of Elasticity:** 210 GPa (30.5 × 10⁶ psi) * **Thermal Conductivity:** ~ 34 W/m·K (at 20°C) * **Coefficient of Thermal Expansion:** 11.5 × 10⁻⁶/°C (20–100°C) ## **5. Product Application** Superplast® 350 is selected for applications where a significant upgrade in wear resistance and strength over standard P20 is needed, without the machining challenges of very high hardness steels. * **High-Volume Plastic Injection Molds:** * **Molds for engineering plastics** (PA, POM, PC, PBT) and **mildly abrasive filled materials** (low-percentage glass or mineral fill). * **Automotive interior and exterior components** requiring durability over long production runs. * **Technical parts and consumer goods molds** where extended tool life reduces cost per part. * **Die Casting Tooling:** * **Ejector plates, support pillars, and holder blocks** requiring higher strength. * **Inserts and cores** for zinc die casting. * **Hot Runner Systems:** * **Manifold plates and support components.** * **General Precision Tooling:** * **Jigs, fixtures, and machine components** subjected to higher mechanical loads. * **Wear plates and guide rails.** ## **6. Key Features & Advantages** * **Enhanced Wear Resistance & Strength:** The 350 HB hardness provides a tangible increase in service life over 300 HB steels for many applications, particularly with engineering and abrasive plastics. * **Optimal Balance of Properties:** Offers the best compromise between improved wear resistance, good machinability, high toughness, and excellent polishability in the prehardened mold steel range. * **Eliminates Secondary Heat Treatment:** Removes the cost, lead time, and risk of distortion associated with through-hardening. * **Excellent Toughness at Elevated Hardness:** Maintains good impact resistance, reducing the risk of chipping and catastrophic failure in large, complex molds. * **Superior Dimensional Stability:** The stress-relieved, prehardened condition ensures minimal movement during and after machining. * **Good Weldability and Repairability:** Allows for reliable mold modifications and repairs using established procedures. * **Good Nitriding Response:** Can be surface hardened via nitriding to further increase surface hardness for specific high-wear areas. ## **7. Processing Guidelines** * **Machining:** Use sharp carbide tools. Slightly reduce cutting speeds and feeds compared to machining 300 HB steels. Use adequate coolant. * **Electrical Discharge Machining (EDM):** Performs well. A stress-relief temper (180-200°C) after roughing is recommended for highest precision work. * **Grinding:** Use appropriate wheels (aluminum oxide). Standard practices apply. * **Welding:** Preheat to 300-350°C. Use low-hydrogen electrodes (e.g., AWS E7018 or matching filler). Post-weld heat treatment at 450-500°C is recommended for critical applications. * **Stress Relieving:** For the most critical, high-precision molds, a final stress relief at 500-550°C after machining may be beneficial. **Summary:** Industeel Superplast® 350 represents a strategically important tier in the mold steel performance hierarchy. It is engineered for mold makers and manufacturers who have identified that standard P20-type steels are nearing their performance limits but wish to avoid the complexities and costs associated with through-hardening or very high hardness prehardened steels. By delivering a 15-20% increase in mechanical strength with minimal compromise on machinability and toughness, Superplast® 350 provides a cost-effective, low-risk path to significantly extended mold life and improved reliability in demanding production environments. It is the intelligent upgrade for applications where more performance is needed, but "maximum" performance is not required. -:- For detailed product information, please contact sales. -: Industeel Superplast® 350 Mold Steel Specification Dimensions Size： Diameter 20-1000 mm Length <7049 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. -: Industeel Superplast® 350 Mold Steel Properties -:- For detailed product information, please contact sales. -:

Applications of InduSteel Sheet,Plate Superplast® 350 Mold Steel Sheet,Plate -:- For detailed product information, please contact sales. -: Chemical Identifiers InduSteel Sheet,Plate Superplast® 350 Mold Steel Sheet,Plate -:- For detailed product information, please contact sales. -:

Packing of InduSteel Sheet/Plate Superplast® 350 Mold 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 3520 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