Assab Steel Flanges, DF-3 Cold Work Steel Flange,ASSAB DF-3

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. -: Assab Steel Flanges DF-3 Cold Work Steel Flange Product Information -:- For detailed product information, please contact sales. -: Assab Steel Flanges DF-3 Cold Work Steel Flange Synonyms -:- For detailed product information, please contact sales. -:

Assab Steels DF-3 Cold Work Steel Product Information -:- For detailed product information, please contact sales. -: ### **Product Datasheet: Assab Steels DF-3 Oil-Hardening Cold Work Tool Steel** **Assab Steels DF-3** is a high-quality, versatile oil-hardening non-shrinking chromium-tungsten tool steel. It is renowned for its excellent dimensional stability during heat treatment, good wear resistance, and balanced toughness. As a classic and economical cold work steel, DF-3 is a reliable choice for a wide range of tooling applications requiring a combination of hardness, machinability, and minimal distortion. #### **1. Key Characteristics & Advantages** * **Minimal Distortion & Dimensional Stability:** Exhibits very low volume change and minimal distortion during oil quenching, making it ideal for intricate tools and precise gauges. * **Good Wear Resistance:** Provides sufficient wear resistance for many cold work applications, extending tool life. * **Good Machinability & Grindability:** Can be easily machined and ground in the annealed condition, reducing manufacturing time and cost. * **Shallow Hardenability:** As an oil-hardening grade, it has a shallower hardening depth compared to air-hardening steels, which can be advantageous for some applications requiring a hard surface with a tough core. * **Good Resistance to Carburization & Decarburization:** Requires less stock removal for cleanup after heat treatment. * **Cost-Effective:** Provides an excellent balance of performance and cost for many standard tooling applications. #### **2. Standard Specifications & International Designations** * **Assab / Uddeholm:** DF-3 * **AISI / ASTM:** O1 (Direct Equivalent) * **DIN / EN:** 1.2510 * **JIS:** SKS3 * **ISO:** 4957: TC105 * **UNS:** T31501 #### **3. Chemical Composition (Typical, Weight %)** | Element | Content (%) | Element | Content (%) | | :--- | :--- | :--- | :--- | | **Carbon (C)** | 0.90 - 1.00 | **Chromium (Cr)** | 0.50 - 0.70 | | **Tungsten (W)** | 0.50 - 0.70 | **Manganese (Mn)** | 1.00 - 1.20 | | **Silicon (Si)** | 0.15 - 0.35 | **Vanadium (V)** | 0.05 - 0.15 | | **Sulfur (S)** | ≤ 0.025 | **Phosphorus (P)** | ≤ 0.025 | | **Iron (Fe)** | Balance | #### **4. Typical Heat Treatment** * **Annealing:** Heat to 740-760°C (1360-1400°F), slow cool. Resulting hardness: ~190 HB. * **Stress Relieving:** 600-650°C (1110-1200°F) after rough machining. * **Preheating:** 650°C (1200°F) * **Austenitizing:** **790-820°C (1450-1510°F)**. Hold thoroughly. Precise temperature controls final properties. * **Quenching:** In circulating **oil** (50-80°C / 120-180°F). * **Tempering:** Immediately after quenching. Typically **150-300°C (300-570°F)**. Hardness after tempering ranges from **58-64 HRC**, depending on tempering temperature. * **Nitriding / Surface Treatment:** Can be nitrided or coated (e.g., TiN, CrN) to further enhance surface hardness and wear resistance. #### **5. Typical Physical & Mechanical Properties (Hardened & Tempered)** * **Density:** 7.83 g/cm³ (0.283 lb/in³) * **Modulus of Elasticity:** 210 GPa (30.5 x 10⁶ psi) * **Thermal Expansion Coefficient:** 11.5 x 10⁻⁶/K (20-100°C) * **Thermal Conductivity:** ~38 W/m·K (at 20°C) * **Hardness (After Tempering at ~200°C):** **61-63 HRC** * **Compressive Strength:** ~ 2500 MPa (at 60 HRC) * **Toughness:** Good for its hardness level. #### **6. Primary Applications** Assab DF-3 is widely used for a variety of cold work tooling where dimensional stability is key: * **Blankting, Forming & Bending Dies:** For sheet metal work. * **Press Tools and Punches:** For general purpose stamping. * **Thread Rolling Dies and Knurls** * **Precision Gauges, Master Tools, and Measuring Instruments** (due to exceptional dimensional stability). * **Cutting Tools:** Such as taps, reamers, and broaches for non-ferrous materials. * **Plastic Molds:** For lower-abrasion, high-precision molds. * **Woodworking Tools:** Knives and blades. #### **7. Availability & Processing Notes** * **Forms Available:** Black bar, precision ground flat stock, forgings. * **Machining:** Recommended in the annealed condition (~190 HB). Use sharp tools and positive rakes. * **EDM (Electrical Discharge Machining):** Can be used. A stress-relief temper is recommended after roughing EDM before finishing. * **Welding:** Not generally recommended for tool repair. If necessary, preheat to 300-400°C and use matching electrodes, followed by full re-hardening. --- **Disclaimer:** This information is for reference purposes. Optimal heat treatment parameters and resulting properties can vary with section size and furnace conditions. For critical applications, always consult the official Assab technical data sheets and processing guidelines. -:- For detailed product information, please contact sales. -: Assab Steels DF-3 Cold Work Steel Specification Dimensions Size： Diameter 20-1000 mm Length <6841 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. -: Assab Steels DF-3 Cold Work Steel Properties -:- For detailed product information, please contact sales. -:

Applications of Assab Steel Flanges DF-3 Cold Work Steel Flange -:- For detailed product information, please contact sales. -: Chemical Identifiers Assab Steel Flanges DF-3 Cold Work Steel Flange -:- For detailed product information, please contact sales. -:

Packing of Assab Steel Flanges DF-3 Cold Work 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 3312 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