AISI Type T5 Tungsten-Alloy High-Speed-Tool Steel Tube,Pipe (UNS T12005)

AISI Type T5 Tungsten-Alloy High-Speed-Tool Steel Tube (UNS T12005) Product Information -:- For detailed product information, please contact sales. -: AISI Type T5 Tungsten-Alloy High-Speed-Tool Steel Tube (UNS T12005) Synonyms -:- For detailed product information, please contact sales. -:

AISI Type T5 Tungsten-Alloy High-Speed-Tool Steel (UNS T12005) Product Information -:- For detailed product information, please contact sales. -: # **Product Introduction: AISI Type T5 Tungsten-Alloy High-Speed Tool Steel (UNS T12005)** ## **Overview** **AISI T5 (UNS T12005)** is a **high-cobalt, tungsten-based super high-speed steel (HSS)** engineered to deliver **exceptional red-hardness and cutting performance under extreme thermal conditions**. As part of the premium T-series, T5 builds upon the T4 foundation with a **substantially increased cobalt content (7.0-9.5%)**, pushing its ability to maintain hardness and edge integrity at very high temperatures to a superior level. It is designed for the most demanding high-speed machining applications involving hard, abrasive, and high-temperature alloys where tool life is limited by thermal softening. ## **1. Chemical Composition (Nominal %)** T5's composition is optimized for maximum hot hardness through a high cobalt and balanced carbide system. | Element | Content (%) | Primary Function | |---------|------------|------------------| | **Carbon (C)** | 0.75 - 0.85 | Provides matrix hardness and supports carbide formation. Slightly higher than T4 to maintain balance. | | **Tungsten (W)** | 17.50 - 19.00 | **Primary element.** Forms the foundational network of stable tungsten carbides for red-hardness and hot strength. | | **Chromium (Cr)** | 3.75 - 4.50 | Ensures hardenability and provides oxidation resistance. | | **Vanadium (V)** | 1.50 - 2.00 | **Higher than T4.** Forms hard vanadium carbides (VC) for improved wear resistance, compensating for increased cobalt's potential toughness reduction. | | **Cobalt (Co)** | **7.00 - 9.50** | **Defining element.** High cobalt content dramatically elevates red-hardness, tempering resistance, and hot hardness through potent solid solution strengthening of the matrix. | | **Molybdenum (Mo)** | ≤ 0.50 (Residual) | Not a primary alloying element. | | **Iron (Fe)** | Balance | Base metal. | **Key Chemistry Note:** T5 can be thought of as **"T1 with Very High Cobalt and Enhanced Vanadium"**. The **cobalt content (7-9.5%) is its core feature**, providing a significant step up in high-temperature performance from T4 (4.5% Co). The **increased vanadium (up to 2%)** relative to T1/T4 is crucial; it boosts wear resistance to match the enhanced thermal capabilities, ensuring the hard matrix is protected by adequate abrasion-resistant carbides. This composition aims for a supreme balance of heat resistance and wear life. ## **2. Physical & Mechanical Properties** | Property | Typical Value / Condition | |----------|--------------------------| | **Density** | ~8.80 g/cm³ (Very high due to W and Co) | | **Melting Point** | ~1415°C (2580°F) | | **Thermal Conductivity** | Low (~23 W/m·K) | | **Coefficient of Thermal Expansion** | ~10.5 × 10⁻⁶/K (20-600°C) | | **Modulus of Elasticity** | ~215 GPa (31.2 × 10⁶ psi) | | **Annealed Hardness** | 255-302 HB | | **Hardened & Tempered Hardness** | **65-67 HRC** (Can achieve and maintain very high hardness). | | **Red Hardness** | **Outstanding.** One of the highest among traditional T-series grades. Maintains cutting edge hardness effectively at temperatures exceeding **620°C (1150°F)**. | | **Abrasion Resistance** | **Very Good.** Enhanced by the higher vanadium content compared to T4. | | **Toughness** | **Moderate to Low.** The high cobalt content significantly reduces impact resistance. T5 requires very stable, shock-free machining conditions to avoid chipping. | | **Tempering Temperature** | 540-600°C (1000-1110°F), **triple tempering is absolutely mandatory**. | | **Grindability** | **Very Poor** (~25-30% relative to M2). The combination of hard carbides and a cobalt-hardened matrix makes grinding difficult. | ## **3. International Standards & Cross-References** | Standard | Designation | |----------|------------| | **UNS** | T12005 | | **AISI/ASTM (USA)** | T5 (ASTM A600) | | **ISO (International)** | **HS 18-1-2-10** (ISO 4957: Tool steels) | | **DIN (Germany)** | **1.3265** | | **JIS (Japan)** | **SKH4A** (or similar high-cobalt variant) | | **GB (China)** | **W18Cr4VCo8** (Reflecting the ~8% cobalt content) | | **Common Name** | **8% Cobalt Tungsten Super High-Speed Steel** | ## **4. Product Applications** T5 is reserved for severe-duty, high-speed machining operations where cutting edges experience extreme temperatures and thermal fatigue is a primary failure mode. **Primary Applications:** * **High-Speed Machining of Superalloys and High-Temperature Alloys:** * **Nickel-based superalloys** (e.g., Inconel, Waspaloy) and **cobalt-based alloys**. * **High-speed turning and milling of hardened steels** (45-55 HRC). * **Heavy-Duty Cutting Tools under High Thermal Load:** * **Single-point lathe tools and planer tools** for aggressive, high-speed cuts on tough materials. * **End mills and slot drills** for machining aerospace components. * **Gear hobs and broaches** for high-production machining of tough materials. * **Tools for Interrupted Cuts on Hard Materials** where each cut subjects the edge to a thermal shock cycle. **Application Rationale:** T5 is selected when **T4 or M35 prove insufficient in maintaining edge hardness**, and the operation justifies the higher cost and lower toughness. It is often compared to **M42 (Co8%)**, which offers similar red-hardness benefits. The choice between T5 and M42 often comes down to tradition, specific application history, or availability, though M42 generally has better grindability. ## **5. Processing & Heat Treatment Guidelines** Heat treatment of T5 is critical and demands precision to harness its high alloy content. * **Forging:** Heat slowly to **1100-1140°C (2010-2085°F)**. Do not forge below **950°C (1740°F)**. Cool very slowly in insulating material. * **Annealing:** Heat to **870-900°C (1600-1650°F)**, hold, then furnace cool very slowly to **500°C (930°F)**. * **Hardening (Austenitizing):** 1. **Preheating is essential:** Two-stage preheat (550-650°C then 800-850°C) is required to prevent cracking. 2. **Austenitize:** **1270-1290°C (2320-2355°F).** Strict temperature control is vital. 3. **Quench:** In salt bath, oil, or preferably in a vacuum furnace with high-pressure gas (N₂/Ar) quenching for optimal results. * **Tempering:** * **Temper immediately** after reaching hand-warm temperature. * Temper at **540-560°C (1005-1040°F)** for 2+ hours per cycle. * **Triple tempering is non-negotiable.** A fourth temper may be beneficial for maximum dimensional stability. * **Cryogenic treatment** between tempers is highly recommended to transform retained austenite and maximize final hardness. ## **6. Comparative Position** * **vs. T4:** T5 offers **significantly higher red-hardness and hot wear performance** due to its doubled cobalt content, suitable for more extreme conditions. * **vs. M42 (Co8%):** These are **direct functional competitors**. M42, being molybdenum-based, typically offers **better grindability and slightly better toughness** at equivalent hardness, and is more commonly used today. T5 represents the tungsten-based approach to the same high-cobalt performance tier. * **vs. T15:** T15 has slightly lower cobalt but much higher carbon and vanadium. **T15 excels in pure abrasion resistance**, while **T5 may have a slight edge in pure hot hardness**. T15 is generally considered a more advanced and balanced super HSS. **Conclusion:** AISI T5 is a high-performance, high-cobalt tungsten HSS representing a traditional solution for extreme thermal machining challenges. While its use has been largely supplanted by the more user-friendly M42 in many industries, it remains a standardized grade with a proven track record in specific, severe applications. Its selection is justified when maximum high-temperature edge holding is required from a tungsten HSS, and the application can accommodate its brittleness and grinding difficulty. --- **Disclaimer:** T5 is a premium, expensive, and processing-sensitive material. Its successful application requires rigid machine tools, secure workpiece clamping, and optimal cutting parameters to mitigate its low toughness. The grinding process demands diamond or CBN wheels and expert technique to avoid burns and micro-cracks. Economic justification should be based on demonstrated productivity gains over lower-grade HSS in specific high-heat applications. Always follow the material producer's specific heat treatment protocols. -:- For detailed product information, please contact sales. -: AISI Type T5 Tungsten-Alloy High-Speed-Tool Steel (UNS T12005) Specification Dimensions Size： Diameter 20-1000 mm Length <6770 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 T5 Tungsten-Alloy High-Speed-Tool Steel (UNS T12005) Properties -:- For detailed product information, please contact sales. -:

Applications of AISI Type T5 Tungsten-Alloy High-Speed-Tool Steel Tube (UNS T12005) -:- For detailed product information, please contact sales. -: Chemical Identifiers AISI Type T5 Tungsten-Alloy High-Speed-Tool Steel Tube (UNS T12005) -:- For detailed product information, please contact sales. -:

Packing of AISI Type T5 Tungsten-Alloy High-Speed-Tool Steel Tube (UNS T12005) -:- 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 3241 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