Assab Steel Flanges, ASSAB 88 Cold Work 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. -: Assab Steel Flanges ASSAB 88 Cold Work Steel Flange Product Information -:- For detailed product information, please contact sales. -: Assab Steel Flanges ASSAB 88 Cold Work Steel Flange Synonyms -:- For detailed product information, please contact sales. -:

Assab Steels ASSAB 88 Cold Work Steel Product Information -:- For detailed product information, please contact sales. -: ### **Product Datasheet: Assab Steels ASSAB 88 Air-Hardening Cold Work Die Steel** **Assab Steels ASSAB 88** is a premium, multi-purpose chromium-molybdenum-vanadium air-hardening cold work die steel, developed to offer an outstanding balance between high wear resistance and good toughness. It is considered a versatile and highly reliable upgrade over many conventional grades, designed to deliver longer tool life, better performance under stress, and reduced risk of cracking in demanding applications. #### **1. Key Characteristics & Advantages** * **Excellent Balance of Wear Resistance & Toughness:** Optimized alloy composition provides superior wear resistance compared to standard grades like A2 or D2, while maintaining better toughness than high-carbon, high-chromium steels. This leads to less chipping and longer service life. * **High Compressive Strength:** Capable of withstanding very high pressures without deformation, making it ideal for forming, coining, and stamping applications. * **Good Dimensional Stability:** As an air-hardening steel, it exhibits minimal distortion and predictable size change during heat treatment, crucial for precision tools and progressive dies. * **Deep & Uniform Hardenability:** Can be through-hardened in large cross-sections with consistent properties from surface to core. * **Good Machinability & Polishability:** Offers better machinability in the annealed state and can achieve an excellent polished surface finish compared to many high-alloy tool steels, which is vital for plastic molding and fine blanking applications. #### **2. Standard Specifications & International Designations** * **Assab / Uddeholm:** **ASSAB 88** (Proprietary Grade) * **Similar/Equivalent Grades:** * **AISI / ASTM:** Modified A8 type / Similar to S7 but with higher wear resistance. * **DIN / EN:** ~1.2367 / 1.2606 (Not direct equivalents, but in a similar performance class). * **JIS:** SKD11 (Generally outperforms SKD11 in toughness). * **Note:** ASSAB 88 is a proprietary grade, often specified by brand name. It does not have a direct, universal AISI or DIN equivalent, but is frequently compared to and used as a superior alternative to **A2 (DIN 1.2363)** and **D2 (DIN 1.2379)** for many applications. #### **3. Chemical Composition (Typical, Weight %)** | Element | Content (%) | Element | Content (%) | | :--- | :--- | :--- | :--- | | **Carbon (C)** | 0.90 | **Chromium (Cr)** | 7.80 | | **Molybdenum (Mo)** | 2.50 | **Vanadium (V)** | 0.50 | | **Manganese (Mn)** | 0.60 | **Silicon (Si)** | 0.30 | | **Sulfur (S)** | ≤ 0.010 | **Phosphorus (P)** | ≤ 0.020 | | **Iron (Fe)** | Balance | #### **4. Typical Heat Treatment** * **Annealing:** Heat to 850-880°C (1560-1615°F), slow cool (15°C/hr) to 600°C, then air cool. Resulting hardness: **~215 HB**. * **Stress Relieving:** 600-650°C (1110-1200°F) after rough machining. * **Preheating:** 650°C (1200°F) and 850°C (1560°F) - two-stage preheat is recommended. * **Austenitizing:** **970-1010°C (1780-1850°F)**. Soak thoroughly (30-45 min.). Higher temperatures increase wear resistance but reduce toughness. * **Quenching:** Cool in still **air** or **forced air** (2-3 bar). For complex shapes, quenching in **salt bath or oil** at 450-550°C followed by air cooling can minimize risk. * **Tempering:** **Immediate tempering** is critical. Typically double tempered at **180-250°C (355-480°F)** for cold work, or at **400-550°C (750-1020°F)** for applications requiring higher toughness. Hardness after tempering typically ranges from **58-62 HRC** for cold work applications. #### **5. Typical Physical & Mechanical Properties (Hardened & Tempered)** * **Density:** 7.73 g/cm³ (0.279 lb/in³) * **Modulus of Elasticity:** ~210 GPa (30.5 x 10⁶ psi) * **Thermal Expansion Coefficient:** 12.2 x 10⁻⁶/K (20-100°C) * **Thermal Conductivity:** ~25 W/m·K (at 20°C) * **Hardness (Tempered at 200°C):** **60-62 HRC** * **Compressive Strength:** **~2600 MPa** (at 60 HRC) – Very high. * **Toughness:** Good to very good for its wear resistance level. #### **6. Primary Applications** ASSAB 88 is exceptionally versatile and is used for demanding cold work applications where a balance of properties is essential: * **Precision Blanking and Fineblanking Dies** (a key application area). * **Progressive Dies and Lamination Dies** for electronics and motors. * **Forming, Bending, and Cold Extrusion Tools**. * **Shear Blades and Slitter Knives**. * **Thread Rolling Dies and Knurls**. * **High-Wear Plastic Molds and Die-Casting Dies (cores and inserts)** for abrasive materials. * **Master Hobs and Gear Cutting Tools**. * **Punches and Wear Parts** subject to high pressure. #### **7. Availability & Processing Notes** * **Forms Available:** Precision ground flat stock, forged blocks, bars, and pre-finished modules. * **Machining:** Machine in the soft-annealed condition. Use sharp tools with positive rakes. * **EDM (Electrical Discharge Machining):** Standard procedure. A low-temperature stress relief (e.g., 150-200°C) is recommended after roughing. * **Surface Treatment:** Excellent candidate for **PVD coatings (TiN, TiCN, CrN)** and nitriding to further enhance surface performance. * **Welding:** Possible for repair using proper techniques (preheat, matching electrodes, post-weld tempering), but not generally recommended for critical tool sections. --- **Disclaimer:** This information is for reference purposes. ASSAB 88 is a high-performance grade, and its properties are highly dependent on precise heat treatment. For critical tooling, always consult the latest official **Assab / Uddeholm technical data sheets** and consider their application engineering support for optimal results. -:- For detailed product information, please contact sales. -: Assab Steels ASSAB 88 Cold Work Steel Specification Dimensions Size： Diameter 20-1000 mm Length <6842 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 ASSAB 88 Cold Work Steel Properties -:- For detailed product information, please contact sales. -:

Applications of Assab Steel Flanges ASSAB 88 Cold Work Steel Flange -:- For detailed product information, please contact sales. -: Chemical Identifiers Assab Steel Flanges ASSAB 88 Cold Work Steel Flange -:- For detailed product information, please contact sales. -:

Packing of Assab Steel Flanges ASSAB 88 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 3313 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