AISI Type M45 Molybdenum High Speed Tool Steel Tube,Pipe (UNS T11345)

AISI Type M45 Molybdenum High Speed Tool Steel Tube (UNS T11345) Product Information -:- For detailed product information, please contact sales. -: AISI Type M45 Molybdenum High Speed Tool Steel Tube (UNS T11345) Synonyms -:- For detailed product information, please contact sales. -:

AISI Type M45 Molybdenum High Speed Tool Steel (UNS T11345) Product Information -:- For detailed product information, please contact sales. -: ### **Product Introduction: AISI Type M45 Molybdenum High-Speed Tool Steel (UNS T11345)** AISI M45 (UNS T11345) is a unique **carbon-enriched, cobalt-free, molybdenum-based high-speed steel** designed to bridge the performance gap between standard high-speed steels and premium cobalt-bearing grades. Often referred to as an **"Economical High-Hardness HSS"**, its distinguishing feature is the ability to achieve a high working hardness (up to 67 HRC) without the strategic and costly addition of cobalt. This makes M45 an excellent cost-effective alternative for applications requiring superior wear resistance and high hardness, but where the extreme red-hardness of cobalt grades like M42 or M35 is not absolutely critical. --- ### **1. Chemical Composition (Nominal %)** The unique performance of M45 stems from its carefully balanced high-carbon, high-vanadium, and moderate tungsten-molybdenum chemistry. | Element | Content (%) | Primary Function | | :--- | :--- | :--- | | **Carbon (C)** | 1.25 - 1.40 | **Higher than typical HSS.** Provides high matrix hardness and increased carbide volume for exceptional wear resistance. | | **Tungsten (W)** | 5.75 - 6.75 | Contributes to hot hardness and secondary hardening. | | **Molybdenum (Mo)** | 4.50 - 5.50 | Primary hardening element for hardenability and hot strength. | | **Chromium (Cr)** | 3.75 - 4.50 | Enhances hardenability, wear, and mild corrosion resistance. | | **Vanadium (V)** | 1.75 - 2.25 | Forms extremely hard vanadium carbides, providing excellent abrasion resistance. | | **Cobalt (Co)** | **Not Specified** | **Key Differentiator.** M45 achieves hardness through carbon and carbide formers, not cobalt. | | **Silicon (Si)** | 0.15 - 0.40 | Deoxidizer. | | **Manganese (Mn)** | 0.15 - 0.40 | Aids in hardenability. | | **Sulfur (S)** | ≤ 0.03 | Typically low. | | **Phosphorus (P)** | ≤ 0.03 | Impurity kept low. | | **Iron (Fe)** | Balance | Base metal. | --- ### **2. Physical & Mechanical Properties** | Property | Typical Value / Condition | | :--- | :--- | | **Density** | ~8.10 g/cm³ (0.292 lb/in³) | | **Melting Point** | ~1410°C (2570°F) | | **Thermal Conductivity** | Low (~25-30 W/m·K), similar to other complex HSS grades. | | **Coefficient of Thermal Expansion** | ~11.4 x 10⁻⁶/K (20-600°C) | | **Hardness (Annealed)** | 248-285 HB | | **Hardness (Hardened & Tempered)** | **65-67 HRC** (Can reliably achieve 66-67 HRC). | | **Tempering Temperature** | 540-600°C (1000-1110°F), typically double or triple-tempered. | | **Hot Hardness** | **Good.** Superior to M2 but below cobalt-bearing grades (M35, M42). Suitable for moderately high-speed/heavy-duty operations. | | **Abrasion Resistance** | **Excellent.** The high carbon and vanadium content provide wear resistance comparable to more expensive grades. | | **Toughness** | **Moderate to Fair.** Higher carbide volume can reduce toughness compared to lower-carbon HSS. Proper application and sharp edge geometry are important. | | **Grindability** | **Difficult.** High vanadium carbide content requires proper wheel selection (e.g., aluminum oxide or CBN) and grinding techniques. | --- ### **3. International Standards & Cross-References** AISI M45 is a less common but standardized grade. Key equivalents include: | Standard | Designation | | :--- | :--- | | **UNS** | T11345 | | **AISI (USA)** | M45 | | **ASTM (USA)** | A600: M45 | | **ISO (International)** | **HS 6-5-3** (ISO 4957: Tool steels) - This is a close functional equivalent, though not a direct 1:1 match. | | **DIN (Germany)** | **1.3243** (Old designation: S 6-5-3) | | **JIS (Japan)** | No direct equivalent. SKH55 is a closer match to M35. | | **GB (China)** | **W6Mo5Cr4V2Al** (A cobalt-free, aluminum-modified super HSS with similar performance philosophy) | --- ### **4. Product Applications** M45 is ideal for applications demanding high hardness and excellent wear resistance at a more competitive price point than cobalt HSS. **Primary Applications Include:** * **Cutting Tools:** * **High-wear drills, taps, and end mills** for machining abrasive materials such as cast irons, carbon steels, alloy steels, and some stainless steels. * **Form tools, broaches, and gear cutters** where precise edge retention and wear life are critical. * **Woodworking and plastic cutting knives** requiring long-lasting sharp edges. * **Cold heading dies and punches** for moderate severity applications. * **Industrial Blades & Wear Parts:** * **Shear blades** for cutting wire, rod, or bar stock. * **Slitter knives** for metal or paper. * **Wear plates and guides** in machinery subject to abrasive conditions. **Key Advantage:** **Cost-effective high hardness and wear resistance.** It provides a significant upgrade over M2 or M7 in terms of achievable hardness and tool life, without stepping into the higher-cost cobalt HSS category. It is best suited for operations where cutting temperatures do not exceed those where cobalt's benefits become dominant. --- ### **5. Processing & Heat Treatment Notes** * **Forging:** Heat slowly to **1050-1120°C (1920-2050°F)**. Do not forge below **925°C (1700°F)**. Cool slowly post-forging. * **Annealing:** Heat to **840-870°C (1545-1600°F)**, hold, then furnace cool slowly to **540°C (1000°F)**. * **Hardening (Austenitizing):** **Critical preheating** at 800-850°C (1470-1560°F) is mandatory. Final austenitizing temperature range is relatively narrow, typically **1190-1210°C (2175-2210°F)**. Use salt, oil, or vacuum quenching. Lower austenitizing temperatures promote toughness, higher temperatures promote hardness and wear resistance. * **Tempering:** **Must be tempered immediately** after quenching. Temper at **540-590°C (1000-1095°F)** for at least 2 hours per cycle. **Double tempering is standard; triple tempering is recommended** for maximum dimensional stability and to fully transform retained austenite. The high carbon content makes proper tempering crucial to achieve optimal properties. **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 technical data sheets for precise guidance. -:- For detailed product information, please contact sales. -: AISI Type M45 Molybdenum High Speed Tool Steel (UNS T11345) Specification Dimensions Size： Diameter 20-1000 mm Length <6731 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 M45 Molybdenum High Speed Tool Steel (UNS T11345) Properties -:- For detailed product information, please contact sales. -:

Applications of AISI Type M45 Molybdenum High Speed Tool Steel Tube (UNS T11345) -:- For detailed product information, please contact sales. -: Chemical Identifiers AISI Type M45 Molybdenum High Speed Tool Steel Tube (UNS T11345) -:- For detailed product information, please contact sales. -:

Packing of AISI Type M45 Molybdenum High Speed Tool Steel Tube (UNS T11345) -:- 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 Tube 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 3202 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