International Mold Steel PX5 Pre-Hardened Mold Steel (P20 Type)

International Mold Steel PX5 Pre-Hardened Mold Steel (P20 Type) Product Information -:- For detailed product information, please contact sales. -: International Mold Steel PX5 Pre-Hardened Mold Steel (P20 Type) Synonyms -:- For detailed product information, please contact sales. -:

International Mold Steel PX5 Pre-Hardened Mold Steel (P20 Type) Product Information -:- For detailed product information, please contact sales. -: **Product Introduction: PX5 Pre-Hardened Mold Steel (P20 Type)** --- ### **1. Overview** **PX5** is a premium-grade **pre-hardened, through-hardening mold steel** belonging to the P20-type family. It is engineered and produced by International Mold Steel (IMS) to offer superior machinability, excellent polishability, and uniform hardness throughout large cross-sections directly from the mill. Supplied in a ready-to-machine state with a typical hardness of **28-32 HRC (or 290-330 HB)**, it eliminates the need for subsequent heat treatment by the mold maker for most applications, thereby saving significant time and reducing the risks of distortion associated with quenching. PX5 is specifically optimized for high-quality plastic injection molds and die-casting tooling, offering enhanced consistency and performance over standard P20 grades due to tighter controls on chemical composition, cleanliness, and homogeneity. --- ### **2. International Standards & Specifications** As a proprietary brand steel, PX5 is defined by the manufacturer's internal specifications designed to meet or exceed the requirements of common international P20-type standards. * **Primary Manufacturer Standard:** * **International Mold Steel (IMS) PX5:** Proprietary specification defining the enhanced properties and guaranteed performance. * **Key International Equivalents & Benchmarks:** * **AISI P20 Modified (UNS T51620):** Enhanced version of the standard AISI P20 tool steel. * **DIN 1.2311 / 1.2312 (GS-738 / GS-711):** The most common European pre-hardened mold steel designations. PX5 is a direct, high-quality counterpart. * **JIS G4404 SCM 440 Modified:** Often referenced, though Japanese P20-type steels have variations. * **ISO 4957 35CrMo2 (Type 1):** International standard classification. * **Industry Position:** PX5 is positioned as a **high-uniformity, high-purity version of 1.2311/GS-738**, often processed via advanced secondary refining (like vacuum degassing) to ensure superior internal soundness and isotropic properties. --- ### **3. Chemical Composition (Weight %, Typical)** The composition is balanced for hardenability, machinability, and polishability. | Element | Typical Range (%) | Role & Benefit | | :--- | :--- | :--- | | **Carbon (C)** | 0.33 – 0.40 | Provides core strength and hardness. Optimized for pre-hardening without compromising toughness. | | **Chromium (Cr)** | 1.70 – 2.00 | Increases hardenability for uniform through-thickness hardness, enhances wear resistance, and improves corrosion resistance slightly. | | **Manganese (Mn)** | 0.55 – 0.80 | Enhances hardenability and strength. | | **Molybdenum (Mo)** | 0.25 – 0.40 | **Critical for hardenability.** Promotes deep and uniform hardening, increases toughness, and refines grain structure. | | **Nickel (Ni)** | ~0.15 – 0.25 (optional enhancer) | May be present in some formulations to further improve toughness and hardenability in very large sections. | | **Silicon (Si)** | 0.20 – 0.40 | Deoxidizer, improves strength. | | **Sulfur (S)** | ≤ 0.005 (Low) / ≤ 0.060 (Free-Machining) | **Two variants:** **Low-S** (<0.005%) for **superior polishability and weldability**. **Free-Machining** (~0.05-0.06% S) for **excellent machinability**, at a slight cost to polishability. | | **Phosphorus (P)** | ≤ 0.025 | Impurity, kept low for toughness. | --- ### **4. Typical Physical & Mechanical Properties (As Pre-Hardened)** * **Delivery Condition:** Quenched and tempered (pre-hardened) at the mill. * **Hardness:** **28 – 32 HRC** (typical), equivalent to **290 – 330 HB (Brinell)**. Uniform across the entire section (e.g., up to 600mm thickness). * **Tensile Strength:** ~ 950 – 1100 MPa (138,000 – 160,000 psi) * **Yield Strength (0.2% Offset):** ~ 800 – 950 MPa (116,000 – 138,000 psi) * **Elongation:** ≥ 12% * **Impact Toughness (Charpy V-Notch):** ≥ 25 J (18 ft-lb) at room temperature. * **Density:** 7.85 g/cm³ * **Modulus of Elasticity:** ~ 210 GPa (30.5 x 10⁶ psi) * **Thermal Conductivity:** ~ 36 W/m·K (at 20°C) * **Machinability:** **Excellent** (especially the free-machining variant). Rated ~80-90% of 1% carbon steel. * **Polishability:** **Very Good to Excellent** (Low-Sulfur variant). Capable of achieving fine finishes (SPI #A1-A3) with proper technique. * **Weldability:** **Good** (Low-Sulfur variant). Requires pre-heat (~300-400°C/570-750°F) and post-weld stress relief. Use matching or recommended filler (e.g., AWS ER70S-6 or equivalent). --- ### **5. Product Application** PX5 is the workhorse material for a vast range of medium-to-large plastic injection molds. * **Plastic Injection Molds:** * **Large Molds:** For automotive parts (bumpers, dashboards, door panels), appliance housings, and crates. * **High-Volume Production Molds:** Where dimensional stability and wear resistance are key. * **Mold Bases, Cavities, and Cores:** For general-purpose and engineering plastics (ABS, PP, PE, PC, Nylon). * **Die Casting:** Backup plates, support pillars, and holder blocks for aluminum and zinc die-casting dies. * **Other Tooling:** Jigs, fixtures, and machine components requiring good strength and stability. --- ### **6. Key Features & Advantages** * **Eliminates Heat Treatment:** Ready for machining upon delivery, saving weeks in the manufacturing cycle and avoiding quenching distortion. * **Exceptional Through-Thickness Uniformity:** Advanced melting and heat treatment ensure consistent hardness and properties even in massive blocks. * **Superior Internal Cleanliness:** Low non-metallic inclusion levels result in better polishability, consistent engraving/texturing, and improved fatigue life. * **Excellent Machinability & EDM Performance:** Allows for faster machining speeds and finer finishes, reducing tool wear and production time. * **Good Balance of Toughness & Wear Resistance:** Suitable for molds with intricate details and those subjected to moderate abrasive wear. * **Reliable Nitriding Response:** Can be surface hardened via gas or plasma nitriding to increase surface hardness to 55-60 HRC for enhanced wear resistance on core pins and ejectors. --- **In summary, International Mold Steel PX5 represents a refined and reliable evolution of standard P20-type steel. It provides mold makers with a predictable, high-performance material that streamlines the manufacturing process, reduces risk, and delivers consistent results in the production of high-quality plastic injection molds and tooling.** -:- For detailed product information, please contact sales. -: International Mold Steel PX5 Pre-Hardened Mold Steel (P20 Type) Specification Dimensions Size： Diameter 20-1000 mm Length <7019 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. -: International Mold Steel PX5 Pre-Hardened Mold Steel (P20 Type) Properties -:- For detailed product information, please contact sales. -:

Applications of International Mold Steel PX5 Pre-Hardened Mold Steel (P20 Type) -:- For detailed product information, please contact sales. -: Chemical Identifiers International Mold Steel PX5 Pre-Hardened Mold Steel (P20 Type) -:- For detailed product information, please contact sales. -:

Packing of International Mold Steel PX5 Pre-Hardened Mold Steel (P20 Type) -:- 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 3490 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