Assab Steel Rod/Bars, DF-3 Cold Work Steel Rod/Bar,ASSAB DF-3

Assab Steel Rods DF-3 Cold Work Steel Rod Product Information -:- For detailed product information, please contact sales. -: Assab Steel Rods DF-3 Cold Work Steel Rod Synonyms -:- For detailed product information, please contact sales. -:

Assab Steels DF-3 Cold Work Steel Product Information -:- For detailed product information, please contact sales. -: ### **Product Datasheet: Assab Steels DF-3 Oil-Hardening Cold Work Tool Steel** **Assab Steels DF-3** is a high-quality, versatile oil-hardening non-shrinking chromium-tungsten tool steel. It is renowned for its excellent dimensional stability during heat treatment, good wear resistance, and balanced toughness. As a classic and economical cold work steel, DF-3 is a reliable choice for a wide range of tooling applications requiring a combination of hardness, machinability, and minimal distortion. #### **1. Key Characteristics & Advantages** * **Minimal Distortion & Dimensional Stability:** Exhibits very low volume change and minimal distortion during oil quenching, making it ideal for intricate tools and precise gauges. * **Good Wear Resistance:** Provides sufficient wear resistance for many cold work applications, extending tool life. * **Good Machinability & Grindability:** Can be easily machined and ground in the annealed condition, reducing manufacturing time and cost. * **Shallow Hardenability:** As an oil-hardening grade, it has a shallower hardening depth compared to air-hardening steels, which can be advantageous for some applications requiring a hard surface with a tough core. * **Good Resistance to Carburization & Decarburization:** Requires less stock removal for cleanup after heat treatment. * **Cost-Effective:** Provides an excellent balance of performance and cost for many standard tooling applications. #### **2. Standard Specifications & International Designations** * **Assab / Uddeholm:** DF-3 * **AISI / ASTM:** O1 (Direct Equivalent) * **DIN / EN:** 1.2510 * **JIS:** SKS3 * **ISO:** 4957: TC105 * **UNS:** T31501 #### **3. Chemical Composition (Typical, Weight %)** | Element | Content (%) | Element | Content (%) | | :--- | :--- | :--- | :--- | | **Carbon (C)** | 0.90 - 1.00 | **Chromium (Cr)** | 0.50 - 0.70 | | **Tungsten (W)** | 0.50 - 0.70 | **Manganese (Mn)** | 1.00 - 1.20 | | **Silicon (Si)** | 0.15 - 0.35 | **Vanadium (V)** | 0.05 - 0.15 | | **Sulfur (S)** | ≤ 0.025 | **Phosphorus (P)** | ≤ 0.025 | | **Iron (Fe)** | Balance | #### **4. Typical Heat Treatment** * **Annealing:** Heat to 740-760°C (1360-1400°F), slow cool. Resulting hardness: ~190 HB. * **Stress Relieving:** 600-650°C (1110-1200°F) after rough machining. * **Preheating:** 650°C (1200°F) * **Austenitizing:** **790-820°C (1450-1510°F)**. Hold thoroughly. Precise temperature controls final properties. * **Quenching:** In circulating **oil** (50-80°C / 120-180°F). * **Tempering:** Immediately after quenching. Typically **150-300°C (300-570°F)**. Hardness after tempering ranges from **58-64 HRC**, depending on tempering temperature. * **Nitriding / Surface Treatment:** Can be nitrided or coated (e.g., TiN, CrN) to further enhance surface hardness and wear resistance. #### **5. Typical Physical & Mechanical Properties (Hardened & Tempered)** * **Density:** 7.83 g/cm³ (0.283 lb/in³) * **Modulus of Elasticity:** 210 GPa (30.5 x 10⁶ psi) * **Thermal Expansion Coefficient:** 11.5 x 10⁻⁶/K (20-100°C) * **Thermal Conductivity:** ~38 W/m·K (at 20°C) * **Hardness (After Tempering at ~200°C):** **61-63 HRC** * **Compressive Strength:** ~ 2500 MPa (at 60 HRC) * **Toughness:** Good for its hardness level. #### **6. Primary Applications** Assab DF-3 is widely used for a variety of cold work tooling where dimensional stability is key: * **Blankting, Forming & Bending Dies:** For sheet metal work. * **Press Tools and Punches:** For general purpose stamping. * **Thread Rolling Dies and Knurls** * **Precision Gauges, Master Tools, and Measuring Instruments** (due to exceptional dimensional stability). * **Cutting Tools:** Such as taps, reamers, and broaches for non-ferrous materials. * **Plastic Molds:** For lower-abrasion, high-precision molds. * **Woodworking Tools:** Knives and blades. #### **7. Availability & Processing Notes** * **Forms Available:** Black bar, precision ground flat stock, forgings. * **Machining:** Recommended in the annealed condition (~190 HB). Use sharp tools and positive rakes. * **EDM (Electrical Discharge Machining):** Can be used. A stress-relief temper is recommended after roughing EDM before finishing. * **Welding:** Not generally recommended for tool repair. If necessary, preheat to 300-400°C and use matching electrodes, followed by full re-hardening. --- **Disclaimer:** This information is for reference purposes. Optimal heat treatment parameters and resulting properties can vary with section size and furnace conditions. For critical applications, always consult the official Assab technical data sheets and processing guidelines. -:- For detailed product information, please contact sales. -: Assab Steels DF-3 Cold Work Steel Specification Dimensions Size： Diameter 20-1000 mm Length <6841 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. -: Assab Steels DF-3 Cold Work Steel Properties -:- For detailed product information, please contact sales. -:

Applications of Assab Steel Rods DF-3 Cold Work Steel Rod -:- For detailed product information, please contact sales. -: Chemical Identifiers Assab Steel Rods DF-3 Cold Work Steel Rod -:- For detailed product information, please contact sales. -:

Packing of Assab Steel Rods DF-3 Cold Work Steel Rod -:- 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 Rod 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 3312 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