Carpenter Hampden® High Carbon, High Chrome Tool Steel Rod/Bar (Oil-Wear) (AISI D3)

Carpenter Hampden® High Carbon, High Chrome Tool Steel Rod (Oil-Wear) (AISI D3) Product Information -:- For detailed product information, please contact sales. -: Carpenter Hampden® High Carbon, High Chrome Tool Steel Rod (Oil-Wear) (AISI D3) Synonyms -:- For detailed product information, please contact sales. -:

Carpenter Hampden® High Carbon, High Chrome Tool Steel (Oil-Wear) (AISI D3) Product Information -:- For detailed product information, please contact sales. -: # **Technical Datasheet: Carpenter Hampden® High Carbon, High Chrome Tool Steel (Oil-Wear) (AISI D3)** --- ## **1. Product Overview** **Carpenter Hampden® Oil-Wear (AISI D3)** is a premium-grade, **high-carbon, high-chromium, oil-hardening cold work tool steel** manufactured under Carpenter's strict quality control protocols. As a direct equivalent to AISI D3, this steel is engineered for applications demanding **the highest possible wear resistance among conventional oil-hardening tool steels**. Its defining characteristic is the formation of a **very high volume of large, hard chromium carbides (M₇C₃ type)** during solidification, which provide exceptional resistance to abrasive wear. The "Hampden®" branding signifies Carpenter's commitment to **consistent chemistry, superior micro-cleanliness, and predictable heat treatment response**. The "Oil-Wear" designation explicitly highlights its primary function (wear resistance) and required quenching medium (oil). This steel is traditionally supplied in the annealed condition and is known for its ability to develop an extremely hard surface when properly heat treated, albeit with lower toughness and higher distortion risk compared to air-hardening grades. --- ## **2. Key International Standards & Designations** | Country/System | Standard Designation | Equivalent Grade Name | | :--- | :--- | :--- | | **USA (Carpenter)** | **Hampden® Oil-Wear** | (Proprietary brand for D3) | | **USA (AISI/SAE)** | **AISI D3 / Type D3** | UNS T30403 | | **USA (ASTM)** | **ASTM A681** | Grade D3 | | **ISO** | **ISO 4957:2018** | **1.2080** / X210Cr12 | | **Europe (EN)** | **EN ISO 4957:2018** | **1.2080** / X210Cr12 | | **Germany (DIN/W-Nr.)** | **1.2080** | X210Cr12 | | **Japan (JIS)** | **JIS G4404** | **SKD1** | | **United Kingdom (BS)** | **BD3** | - | | **Common Industry Names** | High-Carbon High-Chrome, Oil-Hardening Wear Steel | - | --- ## **3. Chemical Composition (Typical %)** The composition is characterized by very high carbon and chromium levels, optimized for maximum carbide formation. | Element | Weight % (Typical Range) | Metallurgical Function | | :--- | :--- | :--- | | **Carbon (C)** | 2.00 - 2.20 | **Primary element.** Ensures a high-carbon martensitic matrix and combines with chromium to form a massive volume of primary carbides. This is the highest carbon content among common D-series steels, directly driving its superior wear resistance. | | **Chromium (Cr)** | 11.00 - 12.00 | **Key alloying element.** Primarily forms the hard, abrasion-resistant **M₇C₃ chromium carbides**. Also contributes to hardenability and provides moderate corrosion resistance. | | **Manganese (Mn)** | 0.30 - 0.50 | Aids in deoxidation and provides a modest increase in hardenability. | | **Silicon (Si)** | 0.15 - 0.40 | Deoxidizer and provides some solid solution strengthening. | | **Molybdenum (Mo)** | 0.80 - 1.00 (often present) | Common modification to improve hardenability, toughness, and tempering response. Carpenter's Oil-Wear may include Mo for enhanced performance. | | **Vanadium (V)** | 0.90 - 1.10 (often present) | **Critical addition in premium grades.** Forms very hard **MC-type vanadium carbides** for additional wear resistance and, more importantly, **refines grain structure** to improve toughness and overheating resistance. | | **Phosphorus (P)** | ≤ 0.025 | Impurity (minimized). | | **Sulfur (S)** | ≤ 0.025 | Impurity (minimized). | **Key Metallurgical Feature:** Contains approximately **18-22% by volume of large, primary chromium carbides**. This microstructure grants unparalleled wear resistance but also results in: - **Poor machinability and grindability** in the annealed state. - **Relatively low toughness** (brittleness) in the hardened state. - **High susceptibility to quench cracking.** --- ## **4. Physical & Mechanical Properties** ### **4.1 Standard Heat Treatment** * **Annealing:** Heat to 850-870°C (1560-1600°F), slow furnace cool (≤15°C/hr) to 600°C (1110°F), then air cool. Annealed hardness: **~210-240 HB**. * **Preheating:** **CRITICAL.** Must preheat at 650°C (1200°F) and 800-850°C (1470-1560°F) to minimize thermal shock and cracking risk. * **Austenitizing (Hardening):** **950-980°C (1740-1800°F).** Soak time: 20-30 minutes per inch. Lower temperatures (~960°C) minimize retained austenite and distortion. * **Quenching:** **Moderate to fast oil quench.** Vigorous agitation is required to ensure uniform cooling and prevent soft spots. Quench to hand-warm (~50-65°C/120-150°F). * **Tempering:** **Must begin immediately** (within 30-60 minutes). **Double tempering is mandatory.** * **For Maximum Wear Resistance:** Temper at 180-200°C (355-390°F), achieving **62-64 HRC**. Very low toughness. * **For General Purpose:** Temper at 400-450°C (750-840°F), achieving **56-58 HRC**. Significantly improved toughness. * **Cryogenic Treatment:** Recommended after quenching (before tempering) to transform retained austenite and improve dimensional stability. ### **4.2 Mechanical Properties (Hardened & Double Tempered)** | Property | Value / Rating (Typical) | Notes | | :--- | :--- | :--- | | **Hardness (Tempered @ 200°C)** | **62 - 64 HRC** | Extremely high, for pure wear applications. | | **Hardness (Tempered @ 425°C)** | **56 - 58 HRC** | Better balance of wear and toughness. | | **Compressive Strength** | ~ 3000 - 3400 MPa | Outstanding. | | **Transverse Rupture Strength (TRS)** | **Low to Moderate** | Significantly lower than air-hardening grades like A2 or D2 due to coarse carbides and oil-quench stresses. | | **Abrasive Wear Resistance** | **Outstanding / Best-in-Class (Oil-Hardening)** | Superior to A2 and O1; comparable to D2 in many abrasive scenarios. | | **Impact Toughness** | **Poor** | The major limiting factor. Highly sensitive to notches and shock loads. | | **Dimensional Stability** | **Fair** | Oil quenching induces higher stress and distortion than air hardening. Careful tempering improves stability. | | **Deep Hardenability** | Good | Can through-harden moderate sections in oil (e.g., up to 75-100mm/3-4" dia). | ### **4.3 Physical Properties (Approximate)** * Density: 7.70 g/cm³ * Thermal Conductivity: ~20 W/m·K (Low - increases cracking risk) * Coefficient of Thermal Expansion: 10.5 x 10⁻⁶/K * Modulus of Elasticity: 205-210 GPa --- ## **5. Typical Product Applications** Hampden® Oil-Wear (D3) is specified for long-run, high-wear tooling where **abrasion is the dominant failure mechanism** and **impact is minimal**. * **Long-Run Blanking & Punching Dies:** For abrasive materials: **fiberglass, composites, prepainted metals, paper, cardboard, plastics, rubber.** * **Cold Forming Rolls & Burnishing Tools.** * **Thread Rolling Dies & Knurls** for non-ferrous materials. * **Shear Blades & Slitter Knives:** For non-metallic sheet materials. * **Gauges, Wear Plates, and Liners** subject to severe abrasion. * **Drawing Dies** for rods and wires. * **Lathe Centers and Guide Pins.** --- ## **6. Processing & Manufacturing Guidelines** * **Machinability (Annealed):** **Very Poor.** Rated at **20-25%** of 1% carbon steel. The hard chromium carbides are extremely abrasive to cutting tools. Use rigid setups, positive rake carbide tooling, and moderate speeds/feeds. * **Grindability:** **Poor.** The hard carbides wear grinding wheels quickly. Use soft-grade, porous aluminum oxide (A) wheels with light passes and ample coolant. Risk of grinding burns is high. * **EDM Machining:** A common and effective method for finishing hardened tools. A **low-temperature stress relief temper (150-180°C) is mandatory after EDM** to remove the brittle white layer. * **Welding:** **Not recommended.** High risk of cracking. If unavoidable, use a meticulous procedure with high preheat, austenitic stainless electrodes, and full post-weld annealing/retempering. --- ## **7. Comparative Performance & Selection Notes** | Criterion | **Hampden® D3 (Oil-Wear)** | **AISI D2 (Air-Hardening)** | **AISI A2 (Air-Hardening)** | | :--- | :--- | :--- | :--- | | **Abrasive Wear Resistance** | **Best** | Very Good | Good | | **Toughness** | **Poorest** | Fair | **Best** | | **Dimensional Stability** | Fair | **Excellent** | **Excellent** | | **Distortion Risk** | **Highest** | Lowest | Low | | **Machinability** | Poorest | Poor | Fair | | **Primary Failure Mode** | **Chipping/Cracking** | Gradual Wear | Gradual Wear/Deformation | **Why Choose Carpenter Hampden® D3?** 1. You require **maximum wear resistance** from an oil-hardening steel. 2. The **application is purely abrasive** with no shock (e.g., cutting paper, plastic, soft composites). 3. **Cost sensitivity** favors oil-hardening over premium air-hardening grades, yet you need better wear than O1. 4. You value the **consistency and quality assurance** of the Carpenter Hampden® brand. **When to Choose an Alternative:** * **For complex shapes or thin sections:** Choose **A2 or D2** (air-hardening) for lower distortion and cracking risk. * **For applications with any impact:** Choose **A2 or S7** for much higher toughness. * **For better machinability and lower cost:** Choose **O1** for less severe wear conditions. --- ## **8. Important Design & Handling Notes** 1. **Design for Wear, Not Toughness:** Use **generous fillet radii (min. R3mm)**, avoid sharp corners and sudden section changes. Design should be robust and simple. 2. **Manage Quench Stresses:** The combination of high carbon, low thermal conductivity, and oil quenching creates extreme stress. **Uniform sections, proper preheat, and controlled quench agitation are non-negotiable.** 3. **Corrosion Resistance:** The high chromium content provides **good resistance to oxidation and mild corrosion**, but it is not a stainless steel. Parts should be protected in humid environments. 4. **Temperature Limit:** Useful hardness is maintained up to **~200-250°C (390-480°F)**. Not for hot work. --- ## **9. Conclusion** **Carpenter Hampden® High Carbon, High Chrome Tool Steel (Oil-Wear) is a specialist material representing the pinnacle of wear resistance in the oil-hardening cold work steel family.** Its exceptionally high volume of chromium carbides delivers unparalleled service life in abrasive, non-shock applications such as blanking non-metallic materials. Choosing this steel involves accepting a fundamental trade-off: **supreme wear resistance for lower toughness, higher manufacturing difficulty, and greater heat treatment risk.** Its successful application hinges on three pillars: 1. **Appropriate Design:** Simple, robust geometries. 2. **Precise Heat Treatment:** Meticulous control of preheat, austenitize, quench, and double temper. 3. **Correct Application:** Purely abrasive wear conditions. For the specific niche of long-run, abrasive wear tooling where its limitations can be engineered around, and where the **Carpenter brand's consistency and quality** are valued, Hampden® Oil-Wear (D3) remains a high-performance, cost-effective solution. For all other applications, air-hardening alternatives like A2 or D2 typically offer a better balance of properties and lower risk. --- -:- For detailed product information, please contact sales. -: Carpenter Hampden® High Carbon, High Chrome Tool Steel (Oil-Wear) (AISI D3) Specification Dimensions Size： Diameter 20-1000 mm Length <5226 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. -: Carpenter Hampden® High Carbon, High Chrome Tool Steel (Oil-Wear) (AISI D3) Properties -:- For detailed product information, please contact sales. -:

Applications of Carpenter Hampden® High Carbon, High Chrome Tool Steel Rod (Oil-Wear) (AISI D3) -:- For detailed product information, please contact sales. -: Chemical Identifiers Carpenter Hampden® High Carbon, High Chrome Tool Steel Rod (Oil-Wear) (AISI D3) -:- For detailed product information, please contact sales. -:

Packing of Carpenter Hampden® High Carbon, High Chrome Tool Steel Rod (Oil-Wear) (AISI D3) -:- 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 1697 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