International Mold Steel Flange,P20 Plastic Mold Steel Flange

1,We Manufacturing processes are primarily classified into four types: 1:Forging, 2:Casting, 3:Cutting, 4:Rolling. 2,We can manufacture in accordance with these standards. Standards: GB Series (Chinese Standards), JB Series (Machinery Standards), HG Series (Chemical Industry Standards), ASME B16.5 (American Standards), BS4504 (British Standards), DIN (German Standards), and JIS (Japanese Standards). Internationally, there are two primary systems of pipe flange standards: the European system, represented by the German DIN standards (including those of the former Soviet Union), and the American system, represented by the US ANSI pipe flange standards. Other common standards include: the Chinese Ministry of Machinery Industry standards (JB series), the Ministry of Chemical Industry standards (HG series), the Chinese National Standard *GB/T 9112–9124-2010 Steel Pipe Flanges*, as well as US standards (ASME B16.5), British standards (BS4504), German standards (DIN), Japanese standards (JIS), and marine standards (CBM), among others. The nominal pressure ratings for the PN series are designated by "PN" and comprise the following nine levels: PN2.5, PN6, PN10, PN16, PN25, PN40, PN63, PN100, and PN160. The nominal pressure ratings for the Class series are designated by "Class" and comprise the following six levels: Class150, Class300, Class600, Class900, Class1500, and Class2500. Flange Classification 1. **According to Chemical Industry Standards:** Flanges are classified as follows: Plate Flat Welding Flange (PL), Necked Flat Welding Flange (SO), Necked Butt Welding Flange (WN), Integral Flange (IF), Socket Welding Flange (SW), Threaded Flange (Th), Butt Welding Ring Loose Flange (PJ/SE), Blind Flange (BL), Flat Welding Ring Loose Flange (PJ/PJ), and Lined Blind Flange (BL(s)). 2. **According to Petrochemical (SH) Industry Standards:** Flanges are classified as follows: Threaded Flange (PL), Butt Welding Flange (WN), Flat Welding Flange (SO), Socket Welding Flange (SW), Loose Flange (LJ), and Blind Flange (no specific designation). 3. **According to Machinery (JB) Industry Standards:** Flanges are classified as follows: Integral Flange, Butt Welding Flange, Plate Flat Welding Flange, Butt Welding Ring Plate Loose Flange, Flat Welding Ring Plate Loose Flange, Lap Joint Ring Plate Loose Flange, and Blind Flange. 4. **According to Connection Method/Type:** Flanges are classified as follows: Plate Flat Welding Flange, Necked Flat Welding Flange, Necked Butt Welding Flange, Socket Welding Flange, Threaded Flange, Blind Flange, Necked Butt Welding Ring Loose Flange, Flat Welding Ring Loose Flange, Ring-Type Joint (RTJ) Flange and Blind Flange, Large-Diameter Plate Flange, Large-Diameter High-Neck Flange, Figure-8 Blind Plate, Butt Welding Ring Loose Flange, etc. 5. **According to the Component Being Connected:** Flanges can be classified into Vessel Flanges and Pipe Flanges. 6. **According to Structural Type:** Flanges include Integral Flanges, Threaded Flanges, Flat Welding Flanges, Butt Welding Flanges, Lap Joint (Loose/Swivel) Flanges, and Blind Flanges. A flange—also referred to as a flange plate or rim—is a component used to connect shafts to one another, or, more commonly, to join the ends of pipes. Flanges are also utilized at the inlet and outlet ports of equipment to facilitate connections between two devices—for instance, the flange on a speed reducer. A "flange connection" or "flanged joint" refers to a detachable joint assembly comprising three interconnected elements—a flange, a gasket, and bolts—that together form a sealed structural unit. In the context of piping systems, a "pipe flange" specifically denotes a flange used for plumbing within the installation; when applied to equipment, it refers to the inlet or outlet flange of that specific device. Flanges feature a series of holes through which bolts are inserted to securely fasten the two flanges together, while a gasket placed between the flanges ensures a leak-proof seal. Flanges are broadly categorized into three types: threaded (screw-in) flanges, welded flanges, and clamp-type flanges. Flanges are invariably used in pairs; threaded flanges are suitable for low-pressure piping applications, whereas welded flanges are required for systems operating at pressures exceeding 4 kilograms per square centimeter. A sealing gasket is inserted between the two flange plates, which are then firmly secured using bolts. The thickness of a flange—as well as the specifications of the bolts used to fasten it—vary depending on the specific pressure rating required for the application. When connecting equipment such as water pumps or valves to piping systems, the corresponding connection points on these devices are often manufactured in the shape of a matching flange; this method of attachment is also referred to as a "flange connection." Generally, any connecting component that utilizes bolts to join and seal the perimeters of two flat surfaces—such as the joints in ventilation ducts—is termed a "flange"; such components may collectively be classified as "flange-type parts." However, since such a connection often constitutes merely a *portion* of a larger device—for instance, the interface between a flange and a water pump—it would be inappropriate to classify the entire water pump itself as a "flange-type part." Conversely, smaller components—such as valves—that feature such flanged interfaces may indeed be appropriately categorized as "flange-type parts." -:- For detailed product information, please contact sales. -: International Mold Steel Flange P20 Plastic Mold Steel Flange Product Information -:- For detailed product information, please contact sales. -: International Mold Steel Flange P20 Plastic Mold Steel Flange 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 Flange P20 Plastic Mold Steel Flange -:- For detailed product information, please contact sales. -: Chemical Identifiers International Mold Steel Flange P20 Plastic Mold Steel Flange -:- For detailed product information, please contact sales. -:

Packing of International Mold Steel Flange P20 Plastic Mold Steel Flange -:- 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 Flange 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