ATI Allegheny Ludlum D2 Tool Steel Flange, UNS T30402

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 D2 Tool Steel Flange, UNS T30402 Product Information -:- For detailed product information, please contact sales. -: ATI Allegheny Ludlum D2 Tool Steel Flange, UNS T30402 Synonyms -:- For detailed product information, please contact sales. -:

ATI Allegheny Ludlum D2 Tool Steel, UNS T30402 Product Information -:- For detailed product information, please contact sales. -: # **Product Introduction: ATI Allegheny Ludlum D2 Tool Steel (UNS T30402)** ## **1. Overview** **ATI Allegheny Ludlum D2 Tool Steel** is a premium **high-carbon, high-chromium, air-hardening cold work tool steel** renowned as the global industry standard for applications requiring **extreme wear resistance and good dimensional stability**. Designated as **UNS T30402** and commonly known as **AISI D2**, this alloy represents the most widely used and recognized member of the high-carbon, high-chromium (HCHCr) steel family. Characterized by its **high volume of hard chromium carbides**, D2 delivers exceptional abrasion resistance, making it the material of choice for long-run production tooling, blanking dies, and wear parts. Its air-hardening nature provides good dimensional control during heat treatment, while ATI's manufacturing ensures consistent quality, fine carbide distribution, and reliable performance in the most demanding cold work applications. ## **2. International Standards & Specifications** D2 is one of the most universally standardized and recognized tool steels across all major industrial regions. * **Primary Standard Designations:** * **UNS T30402:** Unified Numbering System designation. * **AISI D2:** American Iron and Steel Institute classification (the most common identifier). * **ASTM A681:** Standard Specification for Tool Steels Alloy. * **Key International Equivalents:** * **DIN 1.2379 / EN ISO 4957 X153CrMoV12:** The primary European standard. * **JIS G4404 SKD11:** Japanese Industrial Standard. * **GB/T 1299 Cr12Mo1V1:** Chinese national standard. * **ISO 4957:** **X153CrMoV12**. * **Common Trade Names:** Universally referred to as **D2 Tool Steel**, **High Chromium High Carbon Die Steel**, or by various mill-specific premium brand names. ## **3. Chemical Composition (Weight %, per ASTM A681)** The composition is optimized to form a high volume of hard, wear-resistant chromium carbides while maintaining air hardenability. | Element | Composition Range (%) | Role & Benefit | |---------|----------------------|----------------| | **Carbon (C)** | 1.40 – 1.60 | **High carbon content.** Necessary to form a large volume of hard carbides (primarily Cr₇C₃) with chromium, providing the foundation for **exceptional wear resistance**. | | **Chromium (Cr)** | 11.00 – 13.00 | **Primary alloying element.** Forms abundant, hard chromium carbides for wear resistance. Provides good hardenability and moderate corrosion resistance. | | **Molybdenum (Mo)** | 0.70 – 1.20 | Enhances hardenability, refines grain structure, increases toughness, and improves tempering resistance. Reduces the sensitivity to cracking during heat treatment. | | **Vanadium (V)** | 0.50 – 1.10 | **Critical for wear and grain refinement.** Forms extremely hard vanadium carbides (VC) that further increase abrasion resistance and inhibit grain growth during austenitizing, resulting in a tougher final microstructure. | | **Manganese (Mn)** | 0.20 – 0.60 | Aids in hardenability and deoxidation. | | **Silicon (Si)** | 0.10 – 0.60 | Deoxidizer and solid solution strengthener. | | **Note:** The combined high levels of C and Cr result in a **carbide volume of approximately 12-16%**, which is the source of D2's legendary wear resistance. ## **4. Typical Physical & Mechanical Properties (Heat Treated)** * **Recommended Heat Treatment:** * **Preheating:** **Mandatory.** Double preheat: 650°C (1200°F) then 850°C (1560°F) to minimize thermal shock and cracking risk. * **Austenitizing:** **995-1025°C (1825-1880°F).** Precise temperature control is critical to dissolve enough carbon and alloying elements into the austenite without causing excessive grain growth. * **Quenching:** **Air cool (still or forced air).** The high alloy content ensures full hardenability in air for most practical sections. * **Tempering:** **Double tempering is absolutely essential.** Temper immediately after reaching hand-warm. Typical range: **175-540°C (350-1000°F).** It exhibits a strong secondary hardening peak; tempering at **480-540°C (900-1000°F)** often yields an excellent combination of high hardness (~58-60 HRC) and good toughness. * **Mechanical Properties (Hardened & Double Tempered @ 205°C for high hardness / 520°C for toughness):** * **Hardness:** **58 – 62+ HRC** (typical operating range). Can achieve 60-62 HRC with low-temperature tempering; 56-60 HRC with high-temperature tempering for improved toughness. * **Tensile Strength:** 1850 – 2200 MPa (268,000 – 319,000 psi) * **Compressive Strength:** **Exceptional.** One of its greatest assets, ideal for forming and stamping. * **Impact Toughness (Charpy):** **Moderate to Low.** This is the **key trade-off** for its high wear resistance. It is more brittle than A2 or O1 steels at similar hardness. Proper tempering (higher temp) can significantly improve toughness. * **Dimensional Stability:** **Very Good.** Air hardening results in minimal distortion compared to oil-hardening steels, crucial for precision tooling. * **Key Performance Features:** * **Wear/Abrasion Resistance:** **Outstanding.** The benchmark against which many other tool steels are compared. The high volume of hard Cr and V carbides provides exceptional service life in abrasive environments. * **Machinability (Annealed):** **Fair to Poor.** The hard carbides are abrasive to cutting tools. Requires rigid setups, appropriate speeds/feeds, and carbide tooling for best results. * **Grindability:** **Poor.** The hard carbides make grinding difficult and can quickly glaze standard wheels. Requires aluminum oxide or CBN wheels with proper technique. * **Physical Properties:** * **Density:** 7.70 g/cm³ * **Thermal Conductivity:** ~ 20 W/m·K (at 20°C) – Relatively low due to high alloy content. * **Coefficient of Thermal Expansion:** ~ 10.5 × 10⁻⁶/°C (20–100°C) ## **5. Product Application** ATI D2 Tool Steel is the workhorse for high-volume, high-wear cold work applications across numerous industries. * **Blanking, Piercing & Shearing:** * **Progressive dies, blanking dies, and fine blanking dies** for medium to hard materials (including stainless steel). * **Shear blades and slitter knives** for sheet metal. * **Forming, Drawing & Stamping:** * **Forming rolls, bending dies, and draw dies** for long production runs. * **Lamination dies and motor stator/rotor dies.** * **Cutting Tools:** * **Industrial knives, slitters, and cutters** for paper, plastics, rubber, and food processing. * **Woodworking planer blades and router bits.** * **Wear Parts & Machine Components:** * **Gauges, wear plates, guide rails, and liners** in abrasive environments. * **Cold Forging & Extrusion:** * **Punches, dies, and inserts** for cold heading and extrusion. ## **6. Key Features & Advantages** * **Unmatched Wear Resistance (Standard Grades):** Provides the highest level of abrasion resistance among commonly used, cost-effective cold work tool steels. * **Excellent Dimensional Stability:** Air hardening minimizes distortion, allowing for the manufacture of complex, precision tools. * **High Compressive Strength:** Withstands extreme pressure without deforming, ideal for forming and coining operations. * **Good Through-Hardenability:** Hardens fully in air for sections up to several inches thick. * **Moderate Corrosion Resistance:** The high chromium content provides better resistance to rust than most non-stainless tool steels, beneficial in some environments. * **Well-Understood & Proven:** Decades of industrial use have established reliable heat-treating guidelines and performance expectations. ## **7. Processing Guidelines** * **Machining:** Perform in the annealed condition. Expect slower speeds and higher tool wear than for lower-alloy steels. Use carbide tooling. * **Heat Treatment:** **Follow guidelines meticulously.** Use controlled atmosphere furnaces to prevent decarburization. **Never skip preheating. Always double temper.** * **Grinding:** Use appropriate wheels (32A-60H grit aluminum oxide or CBN). Use light passes and good cooling to avoid grinding burns and cracks. * **Electrical Discharge Machining (EDM):** Commonly used. A low-temperature stress relief temper (~180-200°C) after EDM is recommended to mitigate the brittle "white layer." * **Design:** Avoid sharp corners and thin sections prone to cracking. Use generous radii. **Summary:** ATI Allegheny Ludlum D2 Tool Steel is the definitive material for applications where wear resistance is the paramount concern. It embodies a classic engineering trade-off, sacrificing some toughness to achieve legendary durability against abrasion. For high-volume production of metal parts, cutting of abrasive materials, or any application where tool life is limited by wear, D2 offers a proven, reliable, and cost-effective solution. Its status as an industry standard is a testament to its unbeatable value proposition for a vast array of demanding cold work tooling applications. When the question is "what material lasts the longest against wear?" D2 is very often the first and correct answer. -:- For detailed product information, please contact sales. -: ATI Allegheny Ludlum D2 Tool Steel, UNS T30402 Specification Dimensions Size： Diameter 20-1000 mm Length <7056 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 D2 Tool Steel, UNS T30402 Properties -:- For detailed product information, please contact sales. -:

Applications of ATI Allegheny Ludlum D2 Tool Steel Flange, UNS T30402 -:- For detailed product information, please contact sales. -: Chemical Identifiers ATI Allegheny Ludlum D2 Tool Steel Flange, UNS T30402 -:- For detailed product information, please contact sales. -:

Packing of ATI Allegheny Ludlum D2 Tool Steel Flange, UNS T30402 -:- 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 3527 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