International Mold Steel Tube,Pipe,P20 Plastic Mold Steel Tube,Pipe

International Mold Steel Tube P20 Plastic Mold Steel Tube Product Information -:- For detailed product information, please contact sales. -: International Mold Steel Tube P20 Plastic Mold Steel Tube Synonyms -:- For detailed product information, please contact sales. -:

International Mold Steel P20 Plastic Mold Steel Product Information -:- For detailed product information, please contact sales. -: **Product Introduction: P20 (1.2311) Pre-Hardened Plastic Mold Steel** --- ### **1. Overview** **P20 Plastic Mold Steel** is a versatile, **pre-hardened, through-hardening chromium-molybdenum alloy steel** that serves as the global industry standard for injection and blow molds for plastic components. This medium-carbon steel is supplied in a **ready-to-machine, pre-hardened condition** (typically 28-32 HRC), eliminating the need for mold makers to perform additional heat treatment after machining. P20 offers an outstanding balance of **machinability, polishability, weldability, and uniform hardness throughout large cross-sections**. Its reliability, availability, and well-understood processing characteristics have made it the most widely used mold steel worldwide for general-purpose and high-volume plastic production. --- ### **2. International Standards & Specifications** P20 is one of the most standardized tool steels globally, with equivalent designations across all major industrial regions. * **Primary Standards:** * **AISI P20 (UNS T51620):** The American Iron and Steel Institute designation. * **DIN 1.2311 / 1.2312:** The German standard. 1.2311 is the most common "standard" P20, while 1.2312 is a free-machining variant with higher sulfur content. * **ISO 4957 Type 35CrMo2 (GS-738):** International Standardization Organization classification. * **Key International Equivalents:** * **European:** **EN ISO 4957 35CrMo2**, **GS-738** (German trade name). * **Japanese:** **JIS G4404 SCM 440** (modified, similar properties). * **Swedish:** **ASSAB 718** (a premium, modified version with higher hardness and better polishability). * **Chinese:** **GB/T 1299 3Cr2Mo**. * **French:** **AFNOR 40CrMnMo7**. --- ### **3. Chemical Composition (Weight %, Typical for 1.2311)** The composition is balanced for hardenability, toughness, and polishability. | Element | Typical Range (%) | Role & Benefit | | :--- | :--- | :--- | | **Carbon (C)** | 0.33 – 0.40 | Provides core strength and hardness. Balanced to maintain good machinability in the pre-hardened state. | | **Chromium (Cr)** | 1.80 – 2.00 | Enhances hardenability for uniform through-thickness properties, improves wear resistance slightly. | | **Manganese (Mn)** | 1.40 – 1.60 | Promotes hardenability and works with sulfur to improve machinability. | | **Molybdenum (Mo)** | 0.15 – 0.25 | **Critical for hardenability.** Enables deep, uniform hardening in thick sections and improves toughness. | | **Silicon (Si)** | 0.20 – 0.40 | Deoxidizer during steelmaking, provides some solid solution strengthening. | | **Sulfur (S)** | **Varies by grade:**
• **Standard (1.2311):** ≤ 0.005%
• **Free-Machining (1.2312):** ~0.05-0.06% | Controls machinability. **Low sulfur (<0.005%)** ensures superior **weldability and polishability**. **Higher sulfur** creates inclusions that act as chip breakers, dramatically improving **machinability** at a slight cost to polishability and transverse toughness. | --- ### **4. Typical Physical & Mechanical Properties (As Pre-Hardened)** * **Delivery Condition:** Quenched and tempered at the mill (Pre-hardened). * **Hardness:** **28 – 32 HRC** (290 – 330 HB). Uniform across entire section (typically guaranteed up to 400-600mm 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% * **Impact Toughness (Charpy V-Notch):** Typically ≥ 20 J (15 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 1.2312 variant). Rated ~80-90% of 1% carbon steel. * **Polishability:** **Very Good to Excellent** (Standard Low-S variant). Can achieve fine finishes (SPI #A2-A3) with proper technique. * **Weldability:** **Good** (Standard Low-S 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 tool steel filler). --- ### **5. Product Application** P20 is the undisputed workhorse for a vast majority of plastic injection molds. * **Plastic Injection Molds:** * **Mold Bases, Cavities, and Cores** for general-purpose and engineering plastics (ABS, PP, PE, PS, PC, Nylon). * **Large Molds:** For automotive parts (interior trim, housings), appliance components, and consumer goods. * **High-Volume Production Molds:** Where dimensional stability and reliable performance are critical. * **Blow Molds:** For PET bottles and containers. * **Die Casting:** Backup plates, support pillars, and holder blocks for aluminum and zinc die-casting dies. * **Other Tooling:** Jigs, fixtures, gauges, and machine components requiring good strength and stability. --- ### **6. Key Features & Advantages** * **Saves Time & Cost:** Eliminates post-machining heat treatment, reducing lead time and avoiding the risk of distortion from quenching. * **Exceptional Through-Thickness Uniformity:** Guarantees consistent hardness and machining characteristics in very large blocks. * **Superior Machinability:** Allows for high metal removal rates, fine finishes, and extended tool life. * **Good Balance of Toughness & Wear Resistance:** Suitable for molds with intricate details and moderate abrasive wear. * **Reliable Nitriding Response:** Can be surface hardened via gas or plasma nitriding to achieve surface hardness of 55-60 HRC, significantly improving wear resistance for cores, ejector pins, and high-wear areas. * **Predictable & Well-Understood:** Decades of proven performance with extensive industry knowledge on machining, polishing, and maintenance. * **Excellent Price-to-Performance Ratio:** Offers the best combination of properties for its cost, making it economically viable for most mold applications. --- **In summary, International Mold Steel P20 (1.2311) is the fundamental, reliable, and cost-effective choice for plastic mold tooling worldwide. Its pre-hardened delivery condition, excellent machinability, and balanced mechanical properties make it the default material for mold makers, enabling efficient production of high-quality molds for a limitless range of plastic products.** -:- For detailed product information, please contact sales. -: International Mold Steel P20 Plastic Mold Steel Specification Dimensions Size： Diameter 20-1000 mm Length <7025 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 P20 Plastic Mold Steel Properties -:- For detailed product information, please contact sales. -:

Applications of International Mold Steel Tube P20 Plastic Mold Steel Tube -:- For detailed product information, please contact sales. -: Chemical Identifiers International Mold Steel Tube P20 Plastic Mold Steel Tube -:- For detailed product information, please contact sales. -:

Packing of International Mold Steel Tube P20 Plastic Mold 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 3496 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