AISI Type M7 Molybdenum High Speed Tool Steel Flange (UNS T11307)

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 M7 Molybdenum High Speed Tool Steel Flange (UNS T11307) Product Information -:- For detailed product information, please contact sales. -: AISI Type M7 Molybdenum High Speed Tool Steel Flange (UNS T11307) Synonyms -:- For detailed product information, please contact sales. -:

AISI Type M7 Molybdenum High Speed Tool Steel (UNS T11307) Product Information -:- For detailed product information, please contact sales. -: # **Product Introduction: AISI Type M7 Molybdenum High-Speed Tool Steel (UNS T11307)** ## **Overview** **AISI M7 (UNS T11307)** is a **high-carbon, high-vanadium, cobalt-free molybdenum high-speed steel** renowned for its **exceptional abrasion resistance**. Positioned between the standard workhorse M2 and the more specialized high-cobalt grades, M7 is engineered specifically for applications where **wear resistance is the primary concern**. It achieves superior wear life compared to M2 through a significant increase in carbon and vanadium content, making it a cost-effective solution for machining abrasive materials without the expense of cobalt alloying. ## **1. Chemical Composition (Nominal %)** | Element | Content (%) | Primary Function | |---------|------------|------------------| | **Carbon (C)** | 0.97 - 1.07 | **Higher than M2.** Increases matrix hardness and carbide volume for enhanced wear resistance. | | **Tungsten (W)** | 1.30 - 2.10 | Contributes to hot hardness and secondary hardening. | | **Molybdenum (Mo)** | 8.20 - 9.20 | **Primary hardening element.** Provides deep hardenability, strong secondary hardening, and refines grain structure. | | **Chromium (Cr)** | 3.50 - 4.00 | Enhances hardenability and provides oxidation resistance. | | **Vanadium (V)** | 1.70 - 2.10 | **Higher than M2.** Forms hard, wear-resistant vanadium carbides (MC-type) – the key to M7's abrasion resistance. | | **Cobalt (Co)** | **Not Present** | Absence keeps cost lower while focusing on wear performance. | | **Silicon (Si)** | 0.20 - 0.45 | Deoxidizer and strengthens the matrix. | | **Manganese (Mn)** | 0.15 - 0.40 | Improves hardenability. | | **Sulfur (S)** | ≤ 0.03 | Typically kept low. | | **Phosphorus (P)** | ≤ 0.03 | Impurity kept low for toughness. | | **Iron (Fe)** | Balance | Base metal. | **Key Chemistry Note:** M7's defining characteristic is its **high molybdenum and vanadium content relative to carbon**. This "M-V-C" balance creates a microstructure rich in fine, hard vanadium and molybdenum carbides, providing outstanding resistance to abrasive wear. It is often considered the **most wear-resistant of the common cobalt-free "M" series steels** (excluding specialized grades like M4 with even higher vanadium). ## **2. Physical & Mechanical Properties** | Property | Typical Value / Condition | |----------|--------------------------| | **Density** | ~8.06 g/cm³ (0.291 lb/in³) | | **Melting Point** | ~1415°C (2580°F) | | **Thermal Conductivity** | ~27.5 W/m·K at 20°C | | **Coefficient of Thermal Expansion** | 11.3 × 10⁻⁶/K (20-540°C) | | **Modulus of Elasticity** | ~208 GPa (30.2 × 10⁶ psi) | | **Annealed Hardness** | 229-269 HB | | **Hardened & Tempered Hardness** | **63-66 HRC** (Commonly 64-65 HRC). Can achieve up to 66 HRC. | | **Red Hardness** | **Good to Very Good.** Slightly better than M2 due to higher alloy content; effective up to ~550°C (1020°F). | | **Abrasion Resistance** | **Excellent.** Significantly better than M2, approaching some cobalt grades for pure sliding/abrasive wear. | | **Toughness** | **Good.** Slightly lower than M2 due to higher carbide volume, but generally better than high-cobalt grades (M42, M35). | | **Tempering Temperature** | 540-600°C (1000-1110°F), typically double-tempered. | | **Grindability** | **Fair to Difficult** (~50-55% of M2). Higher vanadium content requires proper wheel selection. | ## **3. International Standards & Cross-References** M7 is a well-established grade with clear international equivalents. | Standard | Designation | |----------|------------| | **UNS** | T11307 | | **AISI/ASTM (USA)** | M7 (ASTM A600) | | **ISO (International)** | **HS 1-8-2** (ISO 4957: Tool steels) – **Direct equivalent**. | | **DIN (Germany)** | **1.3348** | | **JIS (Japan)** | **SKH58** (Note: SKH58 can correspond to M7 or similar compositions). | | **GB (China)** | **W2Mo9Cr4V2** (A common and accurate equivalent). | | **AFNOR (France)** | **HS 1-8-2** | ## **4. Product Applications** M7 is the **preferred choice over M2 when machining abrasive materials or when longer tool life is required under high-wear conditions**. Its balance of wear resistance, toughness, and cost is highly valued. **Primary Applications Include:** * **Cutting Tools for Abrasive Materials:** * **Drills, taps, end mills, and reamers** for machining: **cast irons** (especially grey and ductile iron), **stainless steels**, **high-temperature alloys**, **nickel-based alloys**, and **abrasive non-ferrous metals** (e.g., silicon aluminum, copper alloys). * **Form tools, broaches, and gear hobs** for production environments where consistent wear life is critical. * **Saw blades** (band saws, circular saws) for cutting tough alloys. * **Woodworking tools** for processed woods and composites. * **Forming and Wear Parts:** * **Cold work punches, dies, and forming rolls** subject to significant wear. * **Shear blades** for bar, rod, and sheet metal. * **Knives and slitters** for paper, plastics, and sheet metal. * **Wear plates, guides, and liners** in machinery. **Key Advantage:** M7 provides a **substantial increase in tool life (often 50-100% or more) compared to M2 when wear is the limiting factor**, at a moderate increase in material cost. It is the **go-to upgrade from M2** for general machining shops facing abrasive workpiece materials. ## **5. Processing & Heat Treatment Guidelines** * **Forging:** Heat uniformly to **1050-1100°C (1920-2010°F)**. Do not forge below **925°C (1700°F)**. Cool slowly. * **Annealing:** Heat to **840-870°C (1545-1600°F)**, hold, furnace cool slowly to **540°C (1000°F)**. Annealed hardness: 229-269 HB. * **Hardening (Austenitizing):** 1. **Preheat Thoroughly:** 800-850°C (1470-1560°F) is essential. 2. **Austenitize:** **1190-1220°C (2175-2225°F)**. The higher end promotes better wear resistance; the lower end favors toughness. 3. **Quench:** In salt bath, oil, or vacuum/pressurized gas. * **Tempering:** **Temper immediately** after quenching. Temper at **540-590°C (1000-1095°F)** for at least 2 hours per cycle. **Double tempering is standard practice.** It ensures full transformation of retained austenite and maximizes toughness and dimensional stability. ## **6. Comparative Summary** | Grade | Typical Hardness (HRC) | Abrasion Resistance | Toughness | Red-Hardness | Best Application Focus | |-------|------------------------|---------------------|-----------|--------------|------------------------| | **M2** | 62-64 | Good | Very Good | Good | General-purpose HSS machining. | | **M7** | **64-66** | **Excellent** | Good | Very Good | **Abrasive materials** (cast iron, stainless, high-temp alloys). | | **M42 (Co8%)** | 66-68 | Excellent | Fair | Outstanding | High-speed machining of hard/abrasive materials; requires maximum hot hardness. | **Conclusion:** AISI M7 is a strategically important high-speed steel that optimally fills the gap between general-purpose and premium HSS grades. Its **formulation deliberately maximizes wear resistance**, making it an economically and technically sound choice for a wide array of demanding machining and tooling applications where abrasion is the dominant failure mode. --- **Disclaimer:** This information is for reference purposes. Specific processing parameters and application suitability must be verified with the material supplier's technical data sheets and qualified engineering judgment. Proper heat treatment is critical to achieving the optimal balance of properties for which M7 is designed. -:- For detailed product information, please contact sales. -: AISI Type M7 Molybdenum High Speed Tool Steel (UNS T11307) Specification Dimensions Size： Diameter 20-1000 mm Length <6739 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 M7 Molybdenum High Speed Tool Steel (UNS T11307) Properties -:- For detailed product information, please contact sales. -:

Applications of AISI Type M7 Molybdenum High Speed Tool Steel Flange (UNS T11307) -:- For detailed product information, please contact sales. -: Chemical Identifiers AISI Type M7 Molybdenum High Speed Tool Steel Flange (UNS T11307) -:- For detailed product information, please contact sales. -:

Packing of AISI Type M7 Molybdenum High Speed Tool Steel Flange (UNS T11307) -:- 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 3210 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