ATI Allegheny Ludlum 420ESR Tool Steel Flange, UNS S42000

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. -: ATI Allegheny Ludlum 420ESR Tool Steel Flange, UNS S42000 Product Information -:- For detailed product information, please contact sales. -: ATI Allegheny Ludlum 420ESR Tool Steel Flange, UNS S42000 Synonyms -:- For detailed product information, please contact sales. -:

ATI Allegheny Ludlum 420ESR Tool Steel, UNS S42000 Product Information -:- For detailed product information, please contact sales. -: # **Product Introduction: ATI Allegheny Ludlum 420 ESR Tool Steel (UNS S42000)** ## **1. Overview** **ATI Allegheny Ludlum 420 ESR** is a premium **martensitic stainless tool steel** manufactured via the **Electro-Slag Remelting (ESR) process**, delivering exceptional purity, homogeneity, and performance for the most demanding plastic mold and corrosion-resistant tooling applications. Representing the highest quality tier of AISI 420 stainless steel (UNS S42000), this material is engineered to provide **superior corrosion resistance, excellent polishability, and outstanding dimensional stability**. The ESR refining process eliminates non-metallic inclusions and creates an ultra-fine, isotropic microstructure, enabling flawless mirror-like surface finishes (SPI A1) and perfect replication of fine textures. ATI 420 ESR is the material of choice for optical, medical, and high-gloss consumer product molds where surface quality, cleanability, and resistance to corrosive processing environments are critical. ## **2. International Standards & Specifications** This material represents a premium execution of a widely recognized international stainless tool steel standard. * **Primary Standard Designations:** * **UNS S42000:** Unified Numbering System designation for martensitic stainless steel. * **AISI 420:** American Iron and Steel Institute classification. * **ASTM A681:** Standard Specification for Tool Steels Alloy. * **Key International Equivalents (Premium ESR Quality):** * **DIN 1.2083 ESR / 1.2316 ESR:** The premium European equivalents for plastic mold steels, with 1.2316 having higher Mo content. * **JIS G4404 SUS420J2 (ESR):** Japanese high-grade stainless tool steel. * **ISO 4957 X40Cr13 (ESR):** International standard classification for remelted quality. * **Common Trade Names:** Marketed as **420 ESR, Stainless Mold Steel ESR**, or under proprietary names like **Stavax ESR**. ## **3. Chemical Composition (Weight %, per ASTM A681 - Typical for Premium 420 ESR)** The composition is tightly controlled for optimal corrosion resistance, hardenability, and most critically, polishability. | Element | Composition Range (%) | Role & Benefit | |---------|----------------------|----------------| | **Carbon (C)** | 0.38 – 0.45 | Provides hardness and wear resistance after heat treatment. Precisely controlled for consistent hardening response. | | **Chromium (Cr)** | 12.00 – 14.00 | **Primary corrosion-resisting element.** Forms a protective, self-healing passive chromium oxide (Cr₂O₃) layer, providing **excellent resistance to rust and chemical attack** from moisture, cooling water, and acidic plastic by-products. | | **Molybdenum (Mo)** | May be present (0.5-1.0%) in modified grades | Enhances pitting corrosion resistance, hardenability, and toughness. Often added in "420 Modified" or "1.2316-type" grades. | | **Manganese (Mn)** | ≤ 1.00 | Aids in deoxidation and hot workability. | | **Silicon (Si)** | ≤ 1.00 | Deoxidizer, improves fluidity and oxidation resistance. | | **Vanadium (V)** | May be present in small amounts | Added for grain refinement. | | **Sulfur (S)** | **≤ 0.005 (Ultra-Low - ESR Key Feature)** | **Critical for polishability.** The ESR process and tight control reduce sulfur to extremely low levels, virtually eliminating sulfide inclusions (MnS). This prevents pits and streaks during polishing, enabling **SPI A1 mirror finishes**. | ## **4. Typical Physical & Mechanical Properties** * **Common Delivery Conditions:** Can be supplied **annealed (~200 HB)** for hobbing/machining, or **prehardened (~30-34 HRC)** for direct machining of molds. * **Properties After Final Hardening & Tempering:** * **Austenitizing:** 980-1050°C (1800-1920°F) in vacuum or protective atmosphere. * **Quenching:** Air or oil. * **Tempering:** 200-550°C (390-1020°F) depending on required hardness/toughness balance. * **Achievable Hardness:** **48 – 55 HRC** (typical for corrosion-resistant cavities and cores). * **Tensile Strength:** 1600 – 1950 MPa (232,000 – 283,000 psi) at 50 HRC. * **Impact Toughness:** Good for a stainless tool steel, adequate for mold applications. * **Key Performance Features:** * **Corrosion Resistance:** **Excellent.** Superior to standard tool steels (P20, H13). Highly resistant to rust from condensation, tap water, and acidic decomposition products from plastics like PVC, flame-retardant ABS, and polyacetals. * **Polishability:** **Exceptional (Mirror Class).** The primary advantage of the **ESR process**. The ultra-clean, homogeneous structure allows for the achievement of **flawless, defect-free mirror finishes (SPI #A1)** and perfect replication of fine-etched textures (VDI 3400). * **Dimensional Stability:** Very good during heat treatment, especially when using modern vacuum furnaces. * **Wear Resistance:** Good in the hardened state, suitable for most plastic molding applications. * **Physical Properties:** * **Density:** 7.75 g/cm³ * **Thermal Conductivity:** ~ 24 W/m·K (at 20°C) – Lower than low-alloy steels. * **Coefficient of Thermal Expansion:** ~ 10.5 × 10⁻⁶/°C (20–100°C) * **Modulus of Elasticity:** 200 GPa (29 × 10⁶ psi) ## **5. Product Application** ATI 420 ESR is specified for the highest-end molds where surface finish and corrosion are non-negotiable. * **Optical and Lens Molds:** For cameras, eyewear, LED lenses, and light guides requiring flawless optical surfaces. * **Medical Device Molds:** For syringes, implants, diagnostic equipment, and housings where sterilization, cleanability, and absence of corrosion are mandatory. * **Molds for Corrosive Plastics:** * **Polyvinyl Chloride (PVC)** * **Flame-Retardant (FR) compounds** * **Polyacetals (POM)** * **Consumer Electronics Molds:** For high-gloss housings of mobile phones, laptops, and wearables. * **Food Packaging and Transparent Part Molds:** Where clarity and hygiene are important. * **General High-Polish Molds:** For automotive interior trims and cosmetic packaging. ## **6. Key Features & Advantages of ESR Quality** * **Unmatched Polishability and Texture Transfer:** The **ESR process** ensures an ultra-clean microstructure free from inclusion-related defects, which is the foundation for perfect surface finishes. * **Superior Corrosion Resistance:** High chromium content provides excellent protection in harsh molding environments, extending mold life and reducing maintenance. * **Isotropic Properties:** Uniform mechanical and thermal properties in all directions due to the homogeneous ESR structure, ensuring predictable mold performance. * **Excellent Dimensional Stability:** Minimal and predictable distortion during heat treatment. * **Good Machinability and EDM Performance:** In the annealed or prehardened state, it offers good workability. * **Weldability:** Can be repaired using matching stainless filler rods with proper procedures (pre-heat, post-weld temper). * **Nitriding Suitability:** Responds well to surface hardening treatments like nitriding to further increase surface hardness (>1000 HV) for wear resistance. ## **7. Processing Guidelines** * **Machining:** Use standard tooling for tool steels. In hardened state, use carbide tools. * **Polishing:** Follow sequential grit progression. The material's cleanliness allows for efficient polishing to the highest grades. * **Heat Treatment:** **Always use vacuum or protective atmosphere furnaces** to prevent decarburization and oxidation, which would ruin polishability. * **Welding:** Use matching (420-type) or overalloyed (e.g., 316L) filler metals. Apply pre-heat (200-300°C) and post-weld tempering. * **Storage:** Keep machined surfaces oiled or in low-humidity conditions to leverage its corrosion resistance. **Summary:** ATI Allegheny Ludlum 420 ESR Tool Steel represents the pinnacle of stainless mold steel technology. By applying the Electro-Slag Remelting process to the classic AISI 420 composition, ATI delivers a material with unparalleled internal cleanliness and consistency. This directly translates to the ability to produce optical-quality surface finishes and exceptional corrosion resistance—the two most critical properties for high-end plastic injection molds. For molders in the medical, optical, consumer electronics, and corrosive plastics sectors, 420 ESR is not just a material choice but a strategic investment in mold longevity, part quality, and production reliability. It is the definitive solution where surface perfection and environmental resistance are paramount. -:- For detailed product information, please contact sales. -: ATI Allegheny Ludlum 420ESR Tool Steel, UNS S42000 Specification Dimensions Size： Diameter 20-1000 mm Length <7052 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. -: ATI Allegheny Ludlum 420ESR Tool Steel, UNS S42000 Properties -:- For detailed product information, please contact sales. -:

Applications of ATI Allegheny Ludlum 420ESR Tool Steel Flange, UNS S42000 -:- For detailed product information, please contact sales. -: Chemical Identifiers ATI Allegheny Ludlum 420ESR Tool Steel Flange, UNS S42000 -:- For detailed product information, please contact sales. -:

Packing of ATI Allegheny Ludlum 420ESR Tool Steel Flange, UNS S42000 -:- 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 3523 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