AISI Type L3 Tool Steel Rod/Bar

AISI Type L3 Tool Steel Rod Product Information -:- For detailed product information, please contact sales. -: AISI Type L3 Tool Steel Rod Synonyms -:- For detailed product information, please contact sales. -:

AISI Type L3 Tool Steel Product Information -:- For detailed product information, please contact sales. -: # **Product Introduction: AISI Type L3 (UNS T61203) High-Carbon, High-Chromium Tool Steel** ## **Overview** AISI Type L3 represents a **high-carbon, high-chromium** oil-hardening tool steel within the AISI "L-series" (Low-Alloy, Special Purpose). Characterized by significantly **elevated chromium content (1.00-1.80%)** compared to other L-series grades, L3 offers superior **hardenability, wear resistance, and dimensional stability**. It occupies a performance niche between standard oil-hardening steels and high-carbon, high-chromium D-series steels, providing excellent wear characteristics while maintaining relatively straightforward heat treatment procedures. **Key Advantages:** - **Exceptional Wear Resistance:** High carbon-chromium carbide formation ensures outstanding resistance to abrasion and adhesive wear - **Superior Hardenability:** Deep and uniform hardening capability through oil quenching - **Excellent Dimensional Stability:** Minimal distortion during heat treatment due to balanced alloy composition - **Good Toughness Profile:** Maintains reasonable toughness at high hardness levels - **Versatile Machinability:** Readily machinable in annealed condition with proper technique **Primary Considerations:** - Requires careful tempering to balance hardness and toughness - Lower carbon variants (L3A) sacrifice some wear resistance for improved toughness - Not suitable for high-temperature applications (>200°C/400°F) ## **International Designations & Standards** | Standard System | Designation | Note | |----------------|-------------|------| | **AISI/SAE (USA)** | L3 (Variants: L3A ~0.65%C, L3B ~0.85%C) | Primary specification | | **UNS (USA)** | T61203 | Unified numbering system | | **ASTM (USA)** | A681 | Governing material standard | | **DIN (Germany)** | ~1.2419 / **105Cr4** | Closest functional equivalent | | **BS (UK)** | ~**BH5** | Similar high-carbon, oil-hardening grade | | **JIS (Japan)** | ~SKS2/SKS31 | Similar special purpose tool steel | | **ISO (International)** | ~**102Cr6** | Related chromium tool steel standard | *Note: While functional equivalents exist across standards, precise chemical composition ranges may vary. AISI L3 is particularly noted for its specific chromium-carbon balance.* --- ## **1. Chemical Composition (Typical, Weight %)** The defining characteristic is the elevated chromium content relative to other L-series grades, promoting enhanced carbide formation and hardenability. | Element | Content (%) | Role & Metallurgical Effect | |---------|-------------|-----------------------------| | **Carbon (C)** | 0.95 - 1.10 | **Critical element.** Forms chromium carbides (Cr₇C₃, Cr₂₃C₆) for exceptional wear resistance. Determines maximum achievable hardness. | | **Chromium (Cr)** | 1.00 - 1.80 | **Primary alloying element.** Substantially increases hardenability depth, promotes fine carbide distribution, enhances wear/abrasion resistance through hard carbide formation. | | **Manganese (Mn)** | 0.25 - 0.50 | Supports hardenability, aids in deoxidation during steelmaking. | | **Silicon (Si)** | 0.10 - 0.30 | Deoxidizer, provides solid solution strengthening, improves tempering resistance. | | **Vanadium (V)** | 0.10 - 0.20 (Optional) | When present, refines austenite grain size, improves toughness and secondary hardening response. | | **Molybdenum (Mo)** | ≤0.15 (Trace) | Residual element; may be added intentionally to enhance hardenability in modern variants. | | **Phosphorus (P)** | ≤0.025 | Harmful impurity; kept minimal to prevent temper embrittlement. | | **Sulfur (S)** | ≤0.025 | Impurity; controlled levels may be specified for improved machinability (free-machining variants). | | **Iron (Fe)** | Balance | Matrix element. | **Variants Note:** - **L3 (Standard):** ~1.00%C, 1.00-1.80%Cr - **L3A (Lower Carbon):** ~0.65%C, similar Cr range – improved toughness - **L3B (Higher Carbon):** ~0.85%C, similar Cr range – enhanced wear resistance --- ## **2. Physical & Mechanical Properties** ### **Physical Properties** | Property | Typical Value | Conditions/Notes | |----------|---------------|------------------| | **Density** | 7.80 - 7.85 g/cm³ | At 20°C (68°F); varies slightly with composition | | **Melting Range** | 1410 - 1430°C (2570 - 2610°F) | Liquidus to solidus range | | **Thermal Conductivity** | 42 - 46 W/m·K | At 20°C (68°F) | | **Specific Heat Capacity** | 460 - 480 J/kg·K | At 20°C (68°F) | | **Coefficient of Thermal Expansion** | 11.5 - 12.5 × 10⁻⁶/K | 20-200°C (68-392°F) range | | **Electrical Resistivity** | 0.25 - 0.30 μΩ·m | At 20°C (68°F) | | **Elastic Modulus** | 200 - 210 GPa (29 - 30.5 × 10⁶ psi) | At room temperature | ### **Mechanical Properties (Heat-Treated Condition)** | Property | Value Range | Heat Treatment Condition | |----------|-------------|--------------------------| | **Hardness (Annealed)** | 192 - 228 HB | Spheroidize annealed, ready for machining | | **Hardness (Hardened)** | 60 - 64 HRC | Oil quenched from 800-830°C, tempered at 150-200°C | | **Compressive Strength** | 2400 - 2800 MPa (350 - 405 ksi) | At 60-62 HRC | | **Transverse Rupture Strength** | 2000 - 2400 MPa (290 - 350 ksi) | At 60-62 HRC | | **Impact Toughness (Charpy)** | 8 - 15 J (6 - 11 ft·lb) | At 60-62 HRC, unnotched | | **Fatigue Endurance Limit** | 650 - 750 MPa (94 - 109 ksi) | Rotating bending, 10⁷ cycles | ### **Hardenability Data (Jominy Test Typical)** | Distance from Quenched End (1/16 in) | 1 | 4 | 8 | 12 | 16 | 20 | |--------------------------------------|---|---|---|---|---|---| | **Hardness (HRC)** | 64-66 | 62-64 | 60-62 | 58-60 | 56-58 | 54-56 | *Through-hardening capability: Approximately 75-100mm (3-4 inches) diameter in oil quench.* --- ## **3. Product Applications** ### **Primary Application Areas** **1. Precision Cutting & Forming Tools:** - Blanking and punching dies for medium to heavy gauge materials - Thread rolling dies and knurling tools - Forming rolls and bending dies - Shear blades and slitting knives for metals and composites **2. Wear-Resistant Components:** - Gauge blocks and master gauges requiring dimensional stability - Jigs, fixtures, and precision alignment tools - Wear plates and guide rails in machinery - Lathe centers and mandrels **3. Specialized Tooling:** - Cold heading dies and punches - Broaches and reamers for precision hole finishing - Milling cutters and gear shaper cutters (low-speed applications) - Woodworking knives and planer blades **4. Mold & Die Applications:** - Plastic injection molds for engineering resins (non-abrasive) - Compression molds for rubber and plastics - Zinc die casting inserts and cores - Glass molding tools ### **Industry-Specific Applications** | Industry | Typical L3 Components | |----------|-----------------------| | **Metal Stamping** | Progressive die inserts, punch retainers, guide posts | | **Fastener Manufacturing** | Cold forming punches, thread rolling dies, trimming tools | | **Precision Machining** | Collets, arbors, machine tool components | | **Cutlery & Blades** | Professional knife blades, industrial cutting tools | | **Gauge Manufacturing** | Thread plugs, ring gauges, precision measurement masters | --- ## **4. Heat Treatment Guidelines** ### **Annealing (Preparation for Machining)** - **Process:** Full annealing or spheroidize annealing - **Temperature:** 790-815°C (1450-1500°F) - **Cooling:** Slow furnace cool at ≤15°C/hr (≤27°F/hr) to 540°C (1000°F), then air cool - **Resulting Hardness:** 192-228 HB (Brinell) ### **Hardening (Austenitizing & Quenching)** 1. **Preheating:** Essential to minimize thermal shock - Stage 1: 400-500°C (750-930°F) - Stage 2: 700-750°C (1290-1380°F) 2. **Austenitizing:** - **Temperature:** 800-830°C (1475-1525°F) - **Soaking Time:** 20-30 minutes per inch of thickness - **Atmosphere:** Neutral or slightly carburizing to prevent decarburization 3. **Quenching:** - **Medium:** Warm oil (40-80°C / 100-175°F) - **Agitation:** Moderate to vigorous agitation recommended - **Quench to:** 50-80°C (120-175°F) before tempering ### **Tempering (Critical for Performance)** - **Immediate Tempering:** Required within 1-2 hours of quenching - **Standard Cycle:** Double tempering recommended - First temper: 150-200°C (300-400°F) for 2+ hours - Second temper: Same or slightly higher temperature, 2+ hours - **Temperature-Hardness Relationship:** - 150°C (300°F): 63-65 HRC - 200°C (400°F): 60-62 HRC - 250°C (480°F): 58-60 HRC - 300°C (570°F): 55-57 HRC ### **Stress Relieving (Optional)** - After rough machining, before final hardening - **Temperature:** 600-650°C (1110-1200°F) - **Hold Time:** 1-2 hours per inch of thickness - **Cooling:** Slow furnace cool ### **Surface Treatments (Enhancement Options)** - **Nitriding:** Improves surface hardness (up to 70 HRC) and wear resistance - **Chrome Plating:** For corrosion resistance and reduced galling - **TiN/TiCN Coating:** For extreme wear applications (post-hardening) --- ## **5. Machining & Fabrication Notes** ### **Machinability (Annealed Condition)** - **Relative Machinability:** 65-70% (compared to 1% carbon steel = 100%) - **Recommended Cutting Speeds:** - Turning: 40-60 m/min (130-200 SFM) with carbide - Milling: 25-40 m/min (80-130 SFM) with carbide - Drilling: 15-25 m/min (50-80 SFM) with HSS - **Tool Geometry:** Positive rake angles, sharp cutting edges - **Coolant:** Emulsified oil or soluble oil recommended ### **Grinding (Hardened Condition)** - Use aluminum oxide or CBN wheels - Light cuts with ample coolant to prevent grinding burns - Dressing frequency: Regular to maintain sharp abrasive grains ### **Electrical Discharge Machining (EDM)** - Can be performed in annealed or hardened condition - Use fine finishes to minimize white layer formation - Stress relieve after EDM when performed on hardened material --- ## **6. Comparative Analysis** ### **vs. Other L-Series Grades** | Property | L3 | L2 | L1 | L6 | |----------|----|----|----|----| | **Carbon Content** | High (0.95-1.10%) | Medium (0.45-0.75%) | High (0.95-1.10%) | Medium (0.65-0.75%) | | **Chromium Content** | High (1.00-1.80%) | Medium (0.70-1.20%) | Low (0.40-0.60%) | Medium (0.60-1.00%) | | **Primary Strengths** | Wear resistance, hardenability | Balance, toughness | Wear, low cost | Toughness, shock resistance | | **Typical Hardness** | 60-64 HRC | 54-62 HRC | 60-65 HRC | 56-60 HRC | | **Primary Quench Medium** | Oil | Oil | Water | Oil | ### **vs. D-Series (High-Carbon, High-Chromium)** | Aspect | AISI L3 | AISI D2 | |--------|---------|---------| | **Chromium Content** | 1.00-1.80% | 11.00-13.00% | | **Carbide Volume** | Moderate (8-12%) | Very High (12-18%) | | **Distortion During HT** | Minimal | Very Low | | **Machinability** | Good | Fair to Poor | | **Cost Factor** | 0.8-1.0x | 1.2-1.5x | | **Primary Application** | General precision tooling | Extreme wear applications | --- ## **Quality & Inspection** ### **Common Quality Requirements** - **Decarburization:** Max 0.10-0.15mm per side on finished tooling stock - **Non-Metallic Inclusions:** ASTM E45 Method A, Max Thin Series 2 - **Microstructure:** Uniform spheroidized carbides in annealed condition - **Surface Finish:** Typically 3.2μm Ra or better for precision tooling applications ### **Testing & Certification** - Mill test reports to ASTM A681 - Chemical analysis by optical emission spectrometry - Hardness testing per ASTM E10/E18 - Ultrasonic testing available for critical applications --- ## **Technical Notes & Recommendations** ### **Design Considerations** 1. **Section Size:** Optimal performance in sections under 100mm (4 inches) 2. **Stress Concentrations:** Avoid sharp corners; use generous radii (minimum R0.8mm) 3. **Symmetry:** Design for symmetrical heat treatment response 4. **Allowances:** Include grinding allowances (0.10-0.20mm per side) for hardened components ### **Storage & Handling** - Store in dry conditions to prevent rust (chromium provides only minimal corrosion resistance) - Protect machined surfaces from damage - Identify material grade clearly to prevent mix-ups ### **Safety Precautions** - Use appropriate PPE during machining (eye protection, dust masks for grinding) - Handle hardened tools with care due to brittleness - Follow proper heat treatment safety protocols --- ## **Disclaimer** This technical datasheet provides general information about AISI Type L3 tool steel. Properties and performance characteristics may vary depending on manufacturer, heat treatment facility, specific alloy composition, and application conditions. For critical applications: - Consult with steel suppliers for specific grade availability and certification requirements - Work with qualified heat treaters to develop precise thermal processing parameters - Conduct application-specific testing to verify performance - Consider alternative materials for applications outside the recommended temperature range (>200°C/400°F continuous service) This information is subject to revision as manufacturing processes and material specifications evolve. Always reference the most current material standards and supplier documentation for technical specifications. -:- For detailed product information, please contact sales. -: AISI Type L3 Tool Steel Specification Dimensions Size： Diameter 20-1000 mm Length <6707 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 L3 Tool Steel Properties -:- For detailed product information, please contact sales. -:

Applications of AISI Type L3 Tool Steel Rod -:- For detailed product information, please contact sales. -: Chemical Identifiers AISI Type L3 Tool Steel Rod -:- For detailed product information, please contact sales. -:

Packing of AISI Type L3 Tool 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 3178 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