AISI Type M8 High Speed Tool 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. -: AISI Type M8 High Speed Tool Steel Flange Product Information -:- For detailed product information, please contact sales. -: AISI Type M8 High Speed Tool Steel Flange Synonyms -:- For detailed product information, please contact sales. -:

AISI Type M8 High Speed Tool Steel Product Information -:- For detailed product information, please contact sales. -: # **Product Introduction: AISI Type M8 High-Speed Tool Steel** ## **Overview** **AISI M8** is a **molybdenum-tungsten high-speed steel** developed as part of the early evolution of molybdenum-based HSS grades. While less commonly referenced in modern standards than mainstream grades like M2 or M7, M8 represents an important historical formulation in the transition from tungsten-dominated to molybdenum-rich high-speed steels. Characterized by a **balanced tungsten-molybdenum ratio** with moderate vanadium, it was designed to provide good hot hardness and wear resistance at a potentially lower cost than early tungsten-heavy grades. ## **1. Historical Context & Chemical Composition (Nominal %)** **Note:** AISI M8 is not officially listed in current ASTM A600 standards, and precise specifications vary among historical sources. The following represents a consensus based on historical literature and tool steel reference texts. | Element | Historical Content (%) | Primary Function | |---------|-----------------------|------------------| | **Carbon (C)** | 0.78 - 0.88 | Provides matrix hardness and carbide formation. | | **Tungsten (W)** | 5.00 - 5.75 | Contributes to hot hardness and wear resistance. | | **Molybdenum (Mo)** | 5.00 - 5.75 | Primary molybdenum hardening element; improves hardenability and hot strength. | | **Chromium (Cr)** | 3.75 - 4.25 | Enhances hardenability and wear/oxidation resistance. | | **Vanadium (V)** | 1.60 - 2.20 | Forms hard vanadium carbides for wear resistance. | | **Cobalt (Co)** | Not Present (typically) | Historical M8 was generally cobalt-free. | | **Other Elements** | Si, Mn, P, S | Typical residual/deoxidizing elements at historical levels. | | **Iron (Fe)** | Balance | Base metal. | **Key Chemistry Note:** M8's formulation features a **nearly 1:1 ratio of tungsten to molybdenum**. This was a significant development, demonstrating that molybdenum could effectively replace a substantial portion of tungsten while maintaining performance—a key economic and strategic advantage. Its composition is conceptually similar to, but distinct from, modern grades like **M1 (lower vanadium) and M2 (different W-Mo balance)**. ## **2. Physical & Mechanical Properties (Estimated)** Based on its composition, typical properties in the hardened and tempered condition would be: | Property | Estimated Typical Value / Condition | |----------|-------------------------------------| | **Density** | ~8.1 g/cm³ | | **Hardness (Annealed)** | ~220-255 HB | | **Hardness (Hardened & Tempered)** | **63-65 HRC** (when properly heat treated) | | **Red Hardness** | **Good.** Comparable to other intermediate HSS grades of its era. | | **Abrasion Resistance** | **Good to Very Good,** benefiting from its vanadium content. | | **Toughness** | **Good,** owing to its moderate carbon and balanced carbide structure. | | **Grindability** | **Fair.** Better than high-vanadium grades but more difficult than simple compositions. | ## **3. Historical & Approximate Modern Cross-References** Due to its obsolescence in formal standards, direct equivalents are not maintained. However, its compositional philosophy lives on in modern grades. | Standard / Era | Approximate Equivalent / Successor | Notes | |----------------|-----------------------------------|-------| | **Historical AISI** | M8 | Original designation. | | **Modern AISI/ASTM** | **Largely Superseded** | Not listed in current ASTM A600. Functionally replaced by more optimized grades. | | **ISO (Conceptual)** | **HS ~6-5-2 type** (ISO 4957) | Similar tungsten-molybdenum-vanadium balance, though modern HS 6-5-2 is more aligned with M2. | | **Modern Functional Successors** | **M1, M2, M7** | For general HSS applications, M2 became the dominant balanced grade. For more wear resistance, M7 (higher V, Mo) is a logical progression. | | **Common Industry Understanding** | Often considered a precursor or variant within the **M1-M7 series**. | | ## **4. Historical & Niche Applications** As a mainstream industrial material, M8 has been superseded. However, understanding its applications provides historical context: * **Primary Historical Uses:** * **General-purpose cutting tools:** Drills, taps, milling cutters, and lathe tools for machining steels and cast irons. * **Metal forming tools:** Punches, dies, and shear blades where a balance of hardness and toughness was needed. * It served as a **cost-effective alternative to pure tungsten-based T-series grades** (like T1) during periods of tungsten scarcity or high cost. * **Modern Relevance:** * **Historical Tool Restoration:** Understanding its properties is relevant for maintaining or re-treating antique machinery tools. * **Metallurgical Reference:** It remains a point of reference in the study of high-speed steel development. * **Niche Production:** May occasionally be produced for specific legacy tooling or customer specifications but is not a standard stock item. ## **5. Heat Treatment (General Guidelines for M-Type HSS of Similar Composition)** If processing a steel identified as M8, standard high-speed steel practices apply: 1. **Annealing:** Heat to 840-870°C (1550-1600°F), slow furnace cool. 2. **Hardening:** Preheat thoroughly (800-850°C). Austenitize in the range of **1200-1220°C (2190-2225°F)**, then quench in oil or salt. 3. **Tempering:** **Double or triple temper** immediately at 540-590°C (1000-1095°F) to achieve final hardness and stability. ## **Conclusion & Modern Perspective** **AISI M8 is best understood as a historical milestone in tool steel metallurgy.** Its development validated the large-scale substitution of molybdenum for tungsten, paving the way for the economical and high-performance **"M-series" steels that dominate the market today** (notably M2, M3, M4, M7, M42). For any contemporary application, a modern, standardized grade should be selected instead: * For **general-purpose high-speed steel applications**, use **AISI M2**. * For **superior abrasion resistance without cobalt**, use **AISI M7** or **M4**. * For **maximum hot hardness**, use cobalt-bearing grades like **M35** or **M42**. --- **Disclaimer:** This profile is based on historical technical literature. **AISI M8 is not a currently standardized, commercially prevalent tool steel.** The information is provided for educational and historical reference only. For any practical tooling application, consultation with a modern tool steel producer and selection of an active, standardized grade is essential. Properties and processing data for actual, legacy M8 material can vary significantly. -:- For detailed product information, please contact sales. -: AISI Type M8 High Speed Tool Steel Specification Dimensions Size： Diameter 20-1000 mm Length <6740 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. -: AISI Type M8 High Speed Tool Steel Properties -:- For detailed product information, please contact sales. -:

Applications of AISI Type M8 High Speed Tool Steel Flange -:- For detailed product information, please contact sales. -: Chemical Identifiers AISI Type M8 High Speed Tool Steel Flange -:- For detailed product information, please contact sales. -:

Packing of AISI Type M8 High Speed Tool 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 3211 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