AISI Type M43 Molybdenum High Speed Tool Steel (UNS T11343)

AISI Type M43 Molybdenum High Speed Tool Steel (UNS T11343) Product Information -:- For detailed product information, please contact sales. -: AISI Type M43 Molybdenum High Speed Tool Steel (UNS T11343) Synonyms -:- For detailed product information, please contact sales. -:

AISI Type M43 Molybdenum High Speed Tool Steel (UNS T11343) Product Information -:- For detailed product information, please contact sales. -: ### **Product Introduction: AISI Type M43 Molybdenum High-Speed Tool Steel (UNS T11343)** **AISI M43 (UNS T11343)** is a high-carbon, high-cobalt, and high-vanadium molybdenum-based high-speed steel (HSS). It is classified as a **"Super High-Speed Steel"** due to its exceptional combination of very high hardness (up to 70 HRC), outstanding wear resistance, and superior red-hardness (the ability to retain hardness at elevated temperatures). This makes it an elite choice for machining demanding materials and for premium cutting tools requiring extreme performance and long service life. The key characteristics of M43 are derived from its significant cobalt content, which enhances hot hardness and tempering resistance, and its high vanadium content, which provides excellent abrasion resistance through the formation of hard vanadium carbides. --- ### **1. Chemical Composition (Nominal %)** The typical chemical composition of AISI M43 is as follows: | Element | Content (%) | Primary Function | | :--- | :--- | :--- | | **Carbon (C)** | 1.20 - 1.30 | Forms hard carbides for wear resistance and contributes to high hardness. | | **Tungsten (W)** | 1.50 - 2.00 | Contributes to hot hardness and wear resistance. | | **Molybdenum (Mo)** | 7.50 - 8.50 | Primary element for hot hardness and hardenability; forms carbides. | | **Chromium (Cr)** | 3.50 - 4.25 | Enhances hardenability, wear resistance, and provides mild corrosion resistance. | | **Vanadium (V)** | 2.75 - 3.25 | **Key element.** Forms very hard V-carbides, providing exceptional abrasion resistance. | | **Cobalt (Co)** | 7.75 - 8.75 | **Key element.** Does not form carbides but dissolves in the matrix, dramatically increasing red-hardness and tempering resistance. | | **Silicon (Si)** | 0.15 - 0.40 | Deoxidizer during steelmaking. | | **Manganese (Mn)** | 0.15 - 0.40 | Aids in hardenability and acts as a deoxidizer. | | **Sulfur (S)** | ≤ 0.03 | Typically kept low (unless specified for improved machinability in free-machining variants). | | **Phosphorus (P)** | ≤ 0.03 | Impurity kept low for toughness. | | **Iron (Fe)** | Balance | Base metal. | --- ### **2. Physical & Mechanical Properties** | Property | Typical Value / Condition | | :--- | :--- | | **Density** | ~8.10 g/cm³ (0.292 lb/in³) | | **Melting Point** | ~1427°C (2600°F) | | **Thermal Conductivity** | Relatively low (approximately 25-30 W/m·K at 20°C), a common trait in high-alloy steels. | | **Coefficient of Thermal Expansion** | ~11.5 x 10⁻⁶/K (20-600°C) | | **Hardness (Annealed)** | 235-269 HB | | **Hardness (Hardened & Tempered)** | **66-70 HRC** (Commonly achieved at 67-68 HRC for optimal performance balance). | | **Tempering Temperature** | 540-600°C (1000-1110°F), typically triple-tempered. | | **Hot Hardness** | **Excellent.** Retains high hardness well above 600°C (1112°F), superior to standard HSS grades like M2. | | **Abrasion Resistance** | **Exceptional**, due to high vanadium carbide volume. | | **Toughness** | Moderate to Low. The high hardness and carbide content come at the expense of toughness compared to lower-alloy HSS grades. Careful application design is crucial. | --- ### **3. International Standards & Cross-References** AISI M43 is recognized under various international standards. Key equivalents include: | Standard | Designation | | :--- | :--- | | **UNS** | T11343 | | **AISI (USA)** | M43 | | **ASTM (USA)** | A600: M43 | | **ISO (International)** | **HS 2-9-1-8** (ISO 4957: Tool steels) | | **DIN (Germany)** | **1.3202** (Old designation: S 2-9-2) | | **JIS (Japan)** | **SKH59** (Note: Similar but not always an exact 1:1 match) | | **GB (China)** | **W2Mo9Cr4VCo8** (Approximate equivalent) | --- ### **4. Product Applications** AISI M43 is used for high-performance cutting and machining tools where extreme wear resistance and hot hardness are paramount, often where other HSS grades fail prematurely. **Primary Applications Include:** * **Cutting Tools:** * **Premium Drills, Taps, and End Mills:** For machining tough and abrasive materials like high-temperature alloys (Inconel, Waspaloy), titanium alloys, high-strength steels, chilled cast iron, and hardened steels. * **Broaches and Gear Hobs:** Where precise form and exceptional wear life are required. * **Form Tools and Thread Rolling Dies:** Benefiting from high surface hardness. * **Single-Point Lathe Tools:** For heavy-duty, high-speed turning operations. * **Other Tooling:** * **Cold Work Punches and Dies:** For applications requiring very high wear resistance, though toughness limitations must be considered. * **Blades for cutting abrasive non-metallic materials.** **Key Advantage:** **Extended Tool Life** under severe cutting conditions, justifying its higher cost compared to standard HSS grades. --- ### **5. Processing & Heat Treatment Notes** * **Forging:** Heat slowly to **1050-1150°C (1920-2100°F)**. Do not forge below **925°C (1700°F)**. Cool slowly after forging, preferably in a furnace or insulating medium. * **Annealing:** Heat to **840-870°C (1545-1600°F)**, hold, then furnace cool slowly to **540°C (1000°F)**. Typical annealed hardness is 235-269 HB. * **Hardening (Austenitizing):** Preheating is **critical** (at 815°C / 1500°F) to prevent thermal shock. Final austenitizing temperature is typically **1175-1210°C (2150-2210°F)**. Quench in salt bath, oil, or controlled atmosphere. Temperature control is vital to achieve optimal properties. * **Tempering:** **Must be tempered immediately** after quenching to room temperature. Temper at **540-600°C (1000-1110°F)** for at least 2 hours per cycle. **Double or triple tempering** is standard practice to transform retained austenite and achieve maximum hardness and stability. **Disclaimer:** This information is for reference purposes. Specific processing parameters must be determined based on the specific product form, manufacturer's data, and intended application. Always consult the material supplier's data sheets for precise guidance. -:- For detailed product information, please contact sales. -: AISI Type M43 Molybdenum High Speed Tool Steel (UNS T11343) Specification Dimensions Size： Diameter 20-1000 mm Length <6729 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 M43 Molybdenum High Speed Tool Steel (UNS T11343) Properties -:- For detailed product information, please contact sales. -:

Applications of AISI Type M43 Molybdenum High Speed Tool Steel (UNS T11343) -:- For detailed product information, please contact sales. -: Chemical Identifiers AISI Type M43 Molybdenum High Speed Tool Steel (UNS T11343) -:- For detailed product information, please contact sales. -:

Packing of AISI Type M43 Molybdenum High Speed Tool Steel (UNS T11343) -:- 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 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 3200 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