Bohler-Uddeholm,P20 PREMIUM MODIFIED Pre-hardened 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. -: Bohler-Uddeholm P20 PREMIUM MODIFIED Pre-hardened Mold Steel Flange Product Information -:- For detailed product information, please contact sales. -: Bohler-Uddeholm P20 PREMIUM MODIFIED Pre-hardened Mold Steel Flange Synonyms -:- For detailed product information, please contact sales. -:

Bohler-Uddeholm P20 PREMIUM MODIFIED Pre-hardened Mold Steel Product Information -:- For detailed product information, please contact sales. -: # **Böhler-Uddeholm P20 PREMIUM MODIFIED Pre-hardened Mold Steel** ## **Product Overview** **Böhler-Uddeholm P20 PREMIUM MODIFIED** is an enhanced, pre-hardened chromium-molybdenum alloy tool steel specifically engineered for plastic mold and die-casting applications. Supplied at a uniform hardness of approximately **30-33 HRC (285-325 HBW)**, this premium-grade material eliminates the need for heat treatment by the end-user, significantly reducing lead times and minimizing the risks of distortion associated with quenching. The "Modified" designation indicates a controlled chemistry and manufacturing process that delivers superior consistency, machinability, polishability, and weldability compared to standard P20 grades, making it the industry benchmark for high-performance mold bases and cavity inserts. --- ## **1. Key Characteristics & Advantages** * **Ready-to-Machine State:** Supplied pre-hardened and stress-relieved, allowing immediate machining, fabrication, and finishing without subsequent heat treatment. * **Excellent Machinability:** Outstanding cutting performance in its pre-hardened state, reducing cycle times and extending tool life compared to higher-hardness steels. * **Superior Consistency:** Premium melting and processing ensure homogeneous properties throughout the entire cross-section, critical for large mold blocks. * **Very Good Polishability:** Capable of achieving high-quality surface finishes (up to SPI B-2/A-3), suitable for many consumer product applications. * **Good Weldability:** Exhibits excellent weld repair characteristics with minimal pre-heat requirements, a critical feature for mold maintenance and modification. * **High Dimensional Stability:** Minimal risk of distortion during machining due to the stress-relieved condition and uniform microstructure. * **Good Through-Hardening Capacity (if required):** Can be through-hardened to approximately 50 HRC if a higher surface hardness is needed for specific cavity applications. --- ## **2. Typical Chemical Composition (Weight %)** | Element | Carbon (C) | Chromium (Cr) | Molybdenum (Mo) | Manganese (Mn) | Silicon (Si) | | :--- | :---: | :---: | :---: | :---: | :---: | | **Content** | **0.35 - 0.40** | **1.80 - 2.10** | **0.35 - 0.55** | **1.20 - 1.50** | **0.20 - 0.40** | **Alloying Rationale & "Modified" Aspect:** * **Carbon (0.37%):** Balanced to provide adequate hardenability while maintaining excellent machinability in the pre-hardened state. * **Chromium (1.95%) & Molybdenum (0.45%):** Provide hardenability, strength, and contribute to a fine microstructure. The controlled ratio ensures consistent through-thickness properties. * **Manganese (1.35%):** Enhances hardenability and contributes to strength. * **"PREMIUM MODIFIED" Specification:** Implies tighter compositional control, lower sulfur content (<0.005% typical), and often calcium treatment for improved chip formation and superior isotropic properties compared to generic P20. --- ## **3. Physical & Mechanical Properties** ### **Physical Properties (at 30 HRC):** * **Density:** ~7.82 g/cm³ * **Thermal Conductivity:** ~36 W/(m·K) at 20°C * **Modulus of Elasticity:** ~205 GPa * **Coefficient of Thermal Expansion:** ~12.5 x 10⁻⁶/K (20-100°C) ### **Mechanical Properties (Delivery Condition):** * **Hardness:** **285 - 325 HBW (30 - 33 HRC)** * **Tensile Strength:** ~1000 - 1100 MPa * **Yield Strength (0.2% offset):** ~800 - 950 MPa * **Elongation at Break:** ~12% * **Impact Strength (Charpy V):** ~40 - 60 J * **Machinability Index:** ~80% (Relative to 160 HBW free-cutting steel as 100%) --- ## **4. Primary Applications** P20 PREMIUM MODIFIED is the fundamental workhorse material for the global mold-making industry. * **Plastic Injection Molds:** * **Mold bases, backing plates, support pillars, and ejector housings.** * **Cavity and core inserts** for general-purpose and technical plastics (e.g., ABS, PP, PE, PS, PC). * **Large automotive molds** (bumpers, dashboards, interior trim). * **Appliance and consumer goods molds.** * **Die-Casting Dies:** Holder plates, bolster plates, and support frames for aluminum and zinc die-casting. * **Other Tooling:** Stamping die shoes, forming die bases, and master models for prototyping. --- ## **5. Relevant International Standards & Comparable Grades** P20 is a globally recognized classification. The "PREMIUM MODIFIED" version aligns with the highest quality tier within these standards. | Standard | Grade / Designation | Country/Region | Similarity / Note | | :--- | :--- | :--- | :--- | | **AISI / ASTM A681** | **P20 Modified** | USA | Direct equivalent classification for modified chemistry P20. | | **DIN / Werkstoff** | **1.2311 (Modified)** | Germany/EU | 40CrMnMo7-6. The most common European P20 designation. | | **ISO 4957** | **35CrMo2** | International | Corresponding ISO grade. | | **JIS G4404** | **SCM440 Modified** | Japan | Japanese alloy steel equivalent. | | **GB/T 1299** | **3Cr2Mo (SM3Cr2Mo)** | China | Chinese P20 standard grade. | | **Uddeholm Proprietary** | **IMPAX® Supreme** | International | Uddeholm's alternative premium pre-hardened steel with similar applications but different chemistry (Ni-Cr-Mo). | **Crucial Distinction:** While "P20" is a generic term, **Böhler-Uddeholm P20 PREMIUM MODIFIED** signifies material produced with stringent controls for cleanliness, homogeneity, and guaranteed properties, ensuring performance beyond minimum standard requirements. --- ## **6. Processing & Fabrication Guidelines** * **Machining:** **Excellent.** Use carbide tools for optimal performance. Standard tool steel machining practices apply. Good chip breaking is characteristic of this grade. * **Drilling & Tapping:** Performs well. Ensure proper coolant and sharp tools. * **Grinding:** Straightforward. Use aluminum oxide wheels with standard parameters. * **EDM (Sinker & Wire):** Performs very well. A light temper at ~400°C after EDM is recommended to relieve stresses from the hardened surface layer, especially before polishing. * **Polishing & Texturing:** Good polishability for a pre-hardened steel. Proceed through standard abrasive and diamond steps. Suitable for photochemical etching and laser texturing. * **Welding:** **Excellent weldability.** Common for mold repair and modification. * **Pre-heat:** 300 - 400°C (for large sections or high restraint). * **Filler Metal:** Use matching or slightly softer welding wires (e.g., UDDEHOLM P20-W or similar AWS ER70S-6 type). * **Post-Weld:** Stress relieve at 400 - 450°C, especially for critical areas. * **Surface Hardening (Optional):** Can be nitrided (gas or plasma) to increase surface hardness to ~65 HRC for improved wear resistance on selected areas. --- ## **7. Conclusion** **Böhler-Uddeholm P20 PREMIUM MODIFIED** is the definitive, high-reliability choice for mold makers seeking a **balanced, ready-to-use, and versatile material**. It perfectly embodies the principle of "right-first-time" manufacturing by eliminating heat treatment from the production workflow. Its superior consistency and machinability directly translate to reduced lead times, lower manufacturing costs, and predictable performance in the mold. As the backbone of countless production molds worldwide, P20 PREMIUM MODIFIED provides an optimal balance of properties for the vast majority of plastic injection molding applications. For mold bases and inserts where extreme wear resistance or corrosion resistance is not required, it remains the most efficient, economical, and proven engineering solution available. -:- For detailed product information, please contact sales. -: Bohler-Uddeholm P20 PREMIUM MODIFIED Pre-hardened Mold Steel Specification Dimensions Size： Diameter 20-1000 mm Length <6885 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. -: Bohler-Uddeholm P20 PREMIUM MODIFIED Pre-hardened Mold Steel Properties -:- For detailed product information, please contact sales. -:

Applications of Bohler-Uddeholm P20 PREMIUM MODIFIED Pre-hardened Mold Steel Flange -:- For detailed product information, please contact sales. -: Chemical Identifiers Bohler-Uddeholm P20 PREMIUM MODIFIED Pre-hardened Mold Steel Flange -:- For detailed product information, please contact sales. -:

Packing of Bohler-Uddeholm P20 PREMIUM MODIFIED Pre-hardened 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 3356 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