Industeel Superplast® SP300 Prehardened Mold Steel

Industeel Superplast® SP300 Prehardened Mold Steel Product Information -:- For detailed product information, please contact sales. -: Industeel Superplast® SP300 Prehardened Mold Steel Synonyms -:- For detailed product information, please contact sales. -:

Industeel Superplast® SP300 Prehardened Mold Steel Product Information -:- For detailed product information, please contact sales. -: # **Product Introduction: Superplast® SP300 Prehardened Plastic Mold Steel** ## **1. Overview** **Superplast® SP300** is a premium-grade, **prehardened, chromium-molybdenum-vanadium alloyed mold steel** specifically engineered for high-performance plastic injection molds and die-casting tooling. As part of the Industeel Superplast® family, SP300 is supplied in a **quenched and tempered (prehardened) condition** with a guaranteed uniform hardness of approximately **300 HB (32 HRC)**, making it ready for immediate machining without requiring additional heat treatment. This steel offers an optimized balance of **machinability, polishability, weldability, and dimensional stability**, featuring enhanced properties over conventional P20-type steels through tighter compositional control and advanced manufacturing processes. SP300 is particularly valued for medium-to-large plastic injection molds requiring superior surface finish, consistent performance in high-volume production, and reliable resistance to deformation under clamping pressure. ## **2. International Standards & Specifications** Superplast® SP300 meets and exceeds the requirements of major international standards for prehardened mold steels, with additional quality guarantees. * **Primary Manufacturer Standard:** * **Industeel Superplast® SP300:** Proprietary specification defining enhanced prehardened properties. * **Key International Equivalents & Benchmarks:** * **DIN 1.2311 (GS-738) / 1.2312 (GS-711):** The most common European prehardened mold steel grades. SP300 represents a high-quality, enhanced variant. * **AISI P20 Modified (UNS T51620):** American standard for prehardened mold steel. * **ISO 4957 35CrMo2 (Type 1):** International standard classification. * **JIS G4404 SCM 440 Modified:** Japanese equivalent with similar characteristics. * **Industry Position:** Positioned as a **premium P20-type steel** with guaranteed through-hardness, superior cleanliness, and consistent performance in large cross-sections. ## **3. Chemical Composition (Weight %, Typical)** The composition is balanced for optimal hardenability, toughness, and polishability in the prehardened state. | Element | Typical Range (%) | Role & Benefit | |---------|------------------|----------------| | **Carbon (C)** | 0.33 – 0.40 | Provides fundamental strength and hardness while maintaining good toughness and machinability. | | **Chromium (Cr)** | 1.80 – 2.10 | Enhances hardenability for uniform through-thickness properties and improves mild corrosion resistance. | | **Molybdenum (Mo)** | 0.15 – 0.25 | Critical for hardenability in thick sections, improves toughness and tempering resistance. | | **Vanadium (V)** | 0.05 – 0.10 | Added for grain refinement, improves wear resistance and contributes to microstructural stability. | | **Manganese (Mn)** | 1.40 – 1.60 | Enhances hardenability and strength, works with sulfur to improve machinability. | | **Silicon (Si)** | 0.20 – 0.40 | Deoxidizer and solid solution strengthener. | | **Sulfur (S)** | **Two variants available:**
• **Standard:** ≤ 0.005%
• **Free-cutting:** 0.05 – 0.06% | Controls machinability. **Low sulfur (<0.005%)** ensures superior **weldability and polishability**. **Free-cutting variant** offers excellent machinability at slight cost to transverse properties and polishability. | | **Phosphorus (P)** | ≤ 0.025 | Impurity, kept low for optimal toughness. | ## **4. Typical Physical & Mechanical Properties (As Prehardened)** * **Delivery Condition:** Quenched and tempered at the mill, ready for machining. * **Hardness:** **295 – 330 HB (31 – 34 HRC)** – Guaranteed uniform through entire cross-section (typically up to 1000mm thickness). * **Tensile Strength:** 1000 – 1150 MPa (145,000 – 167,000 psi) * **Yield Strength (0.2% Offset):** 850 – 950 MPa (123,000 – 138,000 psi) * **Elongation:** ≥ 12% (in 50mm) * **Impact Toughness (Charpy V-Notch):** ≥ 25 J (18 ft-lb) at room temperature * **Machinability:** **Excellent** – Rated 80-85% of 1% carbon steel (free-cutting variant offers even better machinability). * **Polishability:** **Very Good to Excellent** (Standard low-sulfur variant) – Capable of achieving high surface finishes (SPI #A2-A3) with proper technique. * **Weldability:** **Good** (Standard low-sulfur variant) – Requires preheat (250-350°C) and post-weld stress relief. Use matching or recommended filler metals. * **Physical Properties:** * **Density:** 7.85 g/cm³ * **Modulus of Elasticity:** 210 GPa (30.5 × 10⁶ psi) * **Thermal Conductivity:** 36 W/m·K (at 20°C) * **Coefficient of Thermal Expansion:** 11.5 × 10⁻⁶/°C (20–100°C) * **Specific Heat Capacity:** 460 J/kg·K ## **5. Product Application** Superplast® SP300 is the workhorse material for a wide range of plastic injection and blow molds, particularly suited for medium-to-large components. * **Plastic Injection Molds:** * **Large automotive molds** for interior and exterior components (dashboards, bumpers, door panels) * **Appliance and consumer goods molds** * **Technical parts and packaging molds** * **Mold bases, cavities, and cores** for engineering plastics (ABS, PP, PC, PA, POM) * **Blow Molds:** * **PET bottle molds** * **Technical blow molds** for containers and tanks * **Die Casting Tooling:** * **Backing plates and support pillars** for aluminum and zinc die-casting dies * **Holder blocks and ejector plates** * **General Tooling Components:** * **Jigs, fixtures, and machine components** * **Wear plates and guide rails** ## **6. Key Features & Advantages** * **No Heat Treatment Required:** Eliminates distortion risks, reduces lead time, and lowers manufacturing costs associated with post-machining heat treatment. * **Exceptional Through-Hardness Uniformity:** Guaranteed consistent hardness and properties even in very thick sections (up to 1000mm). * **Superior Machinability:** Both standard and free-cutting variants offer excellent machining characteristics, enabling higher productivity and better surface finishes. * **Excellent Polishability:** Low sulfur content in standard grade ensures high-quality surface finishes suitable for cosmetic parts. * **Good Weldability and Repairability:** Allows for mold repairs and modifications using standard welding procedures. * **High Dimensional Stability:** Minimal distortion during machining ensures accuracy in complex mold geometries. * **Good Nitriding Response:** Can be surface hardened via gas or plasma nitriding to achieve surface hardness of 600-800 HV for enhanced wear resistance on specific components. * **Proven Reliability:** Extensive track record in demanding injection molding applications worldwide. * **Consistent Quality:** Advanced manufacturing processes ensure batch-to-batch consistency and predictable performance. ## **7. Processing Guidelines** * **Machining:** Use sharp carbide tools with positive rake angles. Recommended cutting speeds: 100-150 m/min for turning, 80-120 m/min for milling. * **Electrical Discharge Machining (EDM):** Performs well with standard EDM parameters. A stress-relief treatment (180-200°C for 2-4 hours) is recommended after rough EDM for critical applications. * **Welding:** Preheat to 250-350°C. Use low-hydrogen electrodes (AWS E7018 or equivalent). Post-weld heat treatment at 450-500°C for stress relief is recommended. * **Surface Treatment:** Excellent candidate for nitriding (gas or plasma) to increase surface hardness to 600-800 HV. PVD coatings can also be applied for specific applications. * **Stress Relief:** For critical precision molds, a stress relief treatment (500-550°C for 2 hours per 25mm thickness) after rough machining is recommended. **Summary:** Superplast® SP300 represents a reliable, high-performance prehardened mold steel that has become an industry standard for plastic injection molding applications. Its balanced combination of machinability, polishability, and mechanical properties, coupled with the convenience of prehardened delivery, makes it an economically optimal choice for a wide range of mold manufacturing applications. The guaranteed through-hardness and consistent quality ensure predictable performance and extended tool life, making it a trusted material for mold makers worldwide requiring dependable results in demanding production environments. -:- For detailed product information, please contact sales. -: Industeel Superplast® SP300 Prehardened Mold Steel Specification Dimensions Size： Diameter 20-1000 mm Length <7040 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® SP300 Prehardened Mold Steel Properties -:- For detailed product information, please contact sales. -:

Applications of Industeel Superplast® SP300 Prehardened Mold Steel -:- For detailed product information, please contact sales. -: Chemical Identifiers Industeel Superplast® SP300 Prehardened Mold Steel -:- For detailed product information, please contact sales. -:

Packing of Industeel Superplast® SP300 Prehardened Mold 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 3511 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