ATI Allegheny Ludlum A2 Tool Steel Sheet,Plate, UNS T30102

ATI Allegheny Ludlum A2 Tool Steel Sheet/Plate, UNS T30102 Product Information -:- For detailed product information, please contact sales. -: ATI Allegheny Ludlum A2 Tool Steel Sheet/Plate, UNS T30102 Synonyms -:- For detailed product information, please contact sales. -:

ATI Allegheny Ludlum A2 Tool Steel, UNS T30102 Product Information -:- For detailed product information, please contact sales. -: # **Product Introduction: ATI Allegheny Ludlum A2 Tool Steel (UNS T30102)** ## **1. Overview** **ATI Allegheny Ludlum A2 Tool Steel** is a versatile, high-performance **air-hardening, medium-alloy cold work tool steel** that serves as an industry benchmark for applications requiring an exceptional balance of **wear resistance, toughness, and dimensional stability**. Designated as **UNS T30102** and commonly known as **AISI A2**, this chromium-molybdenum-vanadium steel is renowned for its **deep hardenability, minimal distortion during heat treatment, and good machinability**. As an air-hardening grade, it undergoes significantly less dimensional change than oil-hardening steels, making it ideal for complex, precision tools where maintaining tight tolerances is critical. ATI's A2 is manufactured to deliver consistent quality and reliable performance in demanding blanking, forming, and cutting applications. ## **2. International Standards & Specifications** This material is a widely standardized and globally recognized cold work tool steel grade. * **Primary Standard Designations:** * **UNS T30102:** Unified Numbering System designation. * **AISI A2:** American Iron and Steel Institute classification (most common name). * **ASTM A681:** Standard Specification for Tool Steels Alloy. * **Key International Equivalents:** * **DIN 1.2363 / EN ISO 4957 X100CrMoV5:** The primary European standard. * **JIS G4404 SKD12:** Japanese Industrial Standard. * **GB/T 1299 Cr5Mo1V:** Chinese national standard. * **ISO 4957:** **X100CrMoV5**. * **Common Trade Names:** Often referred to as **A2 Tool Steel**, **Air-Hardening Die Steel**, or by proprietary names from various mills. ## **3. Chemical Composition (Weight %, per ASTM A681)** The composition is optimized for air hardenability, good wear resistance, and a favorable toughness-hardness balance. | Element | Composition Range (%) | Role & Benefit | |---------|----------------------|----------------| | **Carbon (C)** | 0.95 – 1.05 | Provides high hardness and wear resistance through martensite formation. Balanced for toughness. | | **Chromium (Cr)** | 4.75 – 5.50 | **Primary alloy for hardenability and wear.** Provides deep air hardenability and contributes chromium carbides for wear resistance. Also offers mild corrosion resistance. | | **Molybdenum (Mo)** | 0.90 – 1.40 | **Critical for hardenability and toughness.** Enhances deep hardening, refines grain structure, increases toughness, and improves tempering resistance. | | **Vanadium (V)** | 0.15 – 0.50 | **Key for wear and grain refinement.** Forms hard, fine vanadium carbides that improve abrasion resistance and inhibit grain growth during heat treatment, enhancing toughness. | | **Manganese (Mn)** | 0.40 – 1.00 | Aids in hardenability and deoxidation. | | **Silicon (Si)** | 0.10 – 0.50 | Deoxidizer and solid solution strengthener. | | **Sulfur (S)** | ≤ 0.030 | Impurity, typically kept low. | ## **4. Typical Physical & Mechanical Properties (Heat Treated)** * **Recommended Heat Treatment:** * **Preheating:** 650-700°C (1200-1290°F) then 815-870°C (1500-1600°F) to minimize thermal shock. * **Austenitizing:** **925-980°C (1700-1800°F).** A common range is 940-955°C (1725-1750°F). * **Quenching:** **Air cool (still air or forced air).** This is the key advantage, minimizing distortion and cracking risk. * **Tempering:** **Double tempering is strongly recommended.** Temper immediately after reaching hand-warm. Typical range: **175-540°C (350-1000°F).** Hardness is maintained well during tempering (good tempering resistance). A common practice is tempering at 205-425°C (400-800°F) for optimal toughness/hardness balance. * **Mechanical Properties (Hardened & Double Tempered @ 205°C):** * **Hardness:** **60 – 62 HRC** (readily achievable). * **Tensile Strength:** ~ 2000 MPa (290,000 psi) * **Compressive Strength:** Very high. * **Impact Toughness (Charpy):** **Very Good.** Often considered to have the **best toughness of common high-hardness (60+ HRC) cold work steels** (superior to D2, comparable or slightly better than O1). This is a major selling point. * **Dimensional Stability:** **Excellent.** Air hardening produces minimal size change and distortion compared to oil or water quenching, ideal for precision tools. * **Physical Properties:** * **Density:** 7.86 g/cm³ * **Modulus of Elasticity:** 203 GPa (29.4 × 10⁶ psi) * **Thermal Conductivity:** ~ 28 W/m·K (at 20°C) * **Coefficient of Thermal Expansion:** 11.5 × 10⁻⁶/°C (20–100°C) ## **5. Product Application** ATI A2 Tool Steel is a highly versatile material suited for a wide range of demanding cold work applications, especially where precision and toughness are needed. * **Precision Blanking and Forming Dies:** * **Progressive dies, blanking dies, and forming dies** for medium to high production runs. * **Fine blanking dies** requiring high edge strength. * **Cutting Tools and Slitters:** * **Shear blades, slitter knives, and rotary cutters.** * **Industrial knives** for cutting non-metallic materials. * **Gauges, Jigs & Fixtures:** * **Master gauges, thread gauges, and precision fixtures** where dimensional stability is paramount. * **Cold Forging and Extrusion Tools:** * **Punches, dies, and inserts** for cold heading and extrusion. * **Machine Parts and Wear Components:** * **Rolls, cams, and wear plates** requiring a combination of hardness and toughness. * **Woodworking Tools:** High-performance planer blades and router bits. ## **6. Key Features & Advantages** * **Excellent Dimensional Stability (Minimal Distortion):** The air-hardening characteristic is its greatest advantage for complex or precision tools, drastically reducing grinding/finishing time after heat treat. * **Superior Toughness at High Hardness:** Offers the best combination of impact resistance and hardness (60+ HRC) among the most common cold work tool steels (O1, A2, D2), reducing chipping and catastrophic failure. * **Deep and Uniform Hardenability:** Hardens fully in thick sections (up to 4 inches/100mm) in air, ensuring consistent core properties. * **Good Wear Resistance:** Provides excellent service life in many applications, though slightly less than the higher-chromium D2 steel. * **Good Machinability in Annealed State:** Readily machined to complex shapes prior to heat treatment. * **Good Resistance to Tempering:** Maintains hardness well at slightly elevated service temperatures. * **Weldability:** Can be welded with proper pre-heat and post-heat treatment procedures, though it is not considered a free-welding grade. ## **7. Processing Guidelines** * **Machining:** Machine in the annealed condition (~210 HB). Use standard tool steel practices. * **Heat Treatment:** **Preheat thoroughly.** Austenitize in a controlled atmosphere or vacuum furnace to prevent decarburization. **Air cool uniformly. Double temper immediately.** * **Grinding:** Use aluminum oxide wheels. Grind after hardening; the steel is less prone to cracking from grinding heat than some other grades due to its toughness. * **Stress Relieving:** A stress relief (650-675°C) after rough machining is recommended for complex tools. * **Surface Treatment:** An excellent candidate for **nitriding** and **PVD coatings (TiN, TiCN)** to further enhance surface hardness and performance. **Summary:** ATI Allegheny Ludlum A2 Tool Steel is the quintessential "balanced performer" in the cold work steel family. It doesn't claim the ultimate wear resistance of D2 or the simplicity of O1's oil quench, but it masterfully combines high hardness, exceptional toughness, and minimal heat treatment distortion. This makes it the preferred and often safest choice for a vast array of precision tools, complex dies, and applications where tool failure from chipping or dimensional inaccuracy is not an option. For tool designers and manufacturers seeking a reliable, high-performance material that delivers consistent results, A2 remains an enduring and trusted standard. -:- For detailed product information, please contact sales. -: ATI Allegheny Ludlum A2 Tool Steel, UNS T30102 Specification Dimensions Size： Diameter 20-1000 mm Length <7053 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. -: ATI Allegheny Ludlum A2 Tool Steel, UNS T30102 Properties -:- For detailed product information, please contact sales. -:

Applications of ATI Allegheny Ludlum A2 Tool Steel Sheet,Plate, UNS T30102 -:- For detailed product information, please contact sales. -: Chemical Identifiers ATI Allegheny Ludlum A2 Tool Steel Sheet,Plate, UNS T30102 -:- For detailed product information, please contact sales. -:

Packing of ATI Allegheny Ludlum A2 Tool Steel Sheet/Plate, UNS T30102 -:- 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 Sheet/Plate 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 3524 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