Latrobe,LSS™ H11 Hot Work Tool Steel Wire (ASTM H11)

Latrobe LSS™ H11 Hot Work Tool Steel Wire (ASTM H11) Product Information -:- For detailed product information, please contact sales. -: Latrobe LSS™ H11 Hot Work Tool Steel Wire (ASTM H11) Synonyms -:- For detailed product information, please contact sales. -:

Latrobe LSS™ H11 Hot Work Tool Steel (ASTM H11) Product Information -:- For detailed product information, please contact sales. -: # **Latrobe LSS™ H11 Hot Work Tool Steel** ## **Premium Air-Hardening Chromium Hot Work Steel for Superior Toughness** Latrobe LSS™ H11 is a premium chromium-based hot work tool steel renowned for its exceptional toughness and air-hardening characteristics. As an ASTM H11 grade, it offers outstanding combination of high-temperature strength, thermal fatigue resistance, and impact toughness, making it particularly suitable for demanding applications such as aluminum extrusion dies, forging tools, and structural aerospace components. This grade represents an optimal choice where superior toughness is required alongside good hot hardness and wear resistance. --- ### **Key Features & Benefits** - **Exceptional Toughness**: Outstanding impact resistance at both room and elevated temperatures - **Air-Hardening Capability**: Can be hardened in air, minimizing distortion and cracking risks - **Excellent Thermal Fatigue Resistance**: Withstands repeated thermal cycling without cracking - **Good High-Temperature Strength**: Maintains mechanical properties up to 540°C (1000°F) - **Good Wear Resistance**: Adequate abrasion resistance for many hot work applications - **Superior Machinability**: Excellent machinability in the annealed condition --- ### **Chemical Composition (Typical %, ASTM A681 H11)** | Element | Carbon (C) | Chromium (Cr) | Molybdenum (Mo) | Vanadium (V) | Silicon (Si) | Manganese (Mn) | |---------|------------|---------------|-----------------|--------------|--------------|----------------| | **Content** | 0.33 - 0.43 | 4.75 - 5.50 | 1.10 - 1.60 | 0.30 - 0.60 | 0.80 - 1.20 | 0.20 - 0.60 | *Note: LSS™ H11 features a balanced chromium-molybdenum-vanadium composition that provides excellent toughness and air-hardening characteristics. The moderate carbon content ensures good hardenability while maintaining exceptional impact resistance.* --- ### **Physical & Mechanical Properties** | Property | Value / Description | |----------|---------------------| | **Density** | 7.80 g/cm³ | | **Thermal Conductivity** | 25-29 W/m·K at 20°C | | **Specific Heat Capacity** | 0.46 kJ/kg·K at 20°C | | **Coefficient of Thermal Expansion** | 11.2 × 10⁻⁶/K (20-400°C) | | **Hardness (Annealed)** | 192-229 HB | | **Hardness (Heat Treated)** | **44-50 HRC** (typical working range) | | **High-Temperature Yield Strength** | ≥ 1100 MPa at 500°C (930°F) | | **Tensile Strength** | 1,600-1,900 MPa (at 47 HRC) | | **Yield Strength** | 1,400-1,700 MPa (at 47 HRC) | | **Modulus of Elasticity** | 200-210 GPa | | **Impact Toughness** | **Excellent** – among the best in hot work steels | --- ### **Heat Treatment Guidelines** #### **Annealing** - **Temperature**: 845-900°C (1555-1650°F) - **Method**: Slow furnace cool at ≤22°C (40°F) per hour to 600°C (1110°F), then air cool - **Resultant Hardness**: 192-229 HB - **Special Note**: Full annealing recommended for maximum machinability #### **Stress Relieving** - **Temperature**: 650-675°C (1200-1245°F) - **Hold Time**: 1-2 hours per inch of thickness - **Cooling**: Air cool to room temperature #### **Hardening** 1. **Preheating**: 650-750°C (1200-1380°F) – thorough equalization 2. **Austenitizing**: **995-1025°C (1825-1880°F)** – air hardening capability 3. **Soak Time**: 20-30 minutes per inch of thickness 4. **Quenching**: Air cooling sufficient; oil or forced air for maximum hardness 5. **Immediate Handling**: Cool to below 65°C (150°F) before tempering #### **Tempering** - **Temperature Range**: 540-650°C (1005-1200°F) - **Cycles**: Double tempering recommended for dimensional stability - **Duration**: 2 hours per cycle minimum, air cool between cycles - **Target Hardness**: 44-50 HRC typically achieved at 540-600°C (1005-1110°F) - **Special Note**: Higher tempering temperatures for maximum toughness --- ### **International Standards & Equivalent Grades** | Standard | Grade Designation | Notes | |----------|-------------------|-------| | **ASTM** | A681 H11 | Primary specification (UNS T20811) | | **ISO** | 35CrMoV5 | ISO 4957 designation | | **DIN** | 1.2343 / X37CrMoV5-1 | German standard | | **JIS** | SKD6 | Japanese industrial standard | | **AFNOR** | 38CrCoV5 | French association standard | | **GB** | 4Cr5MoSiV | Chinese equivalent | | **UNS** | T20811 | Unified Numbering System | --- ### **Typical Applications** #### **Aluminum Extrusion Industry** - **Extrusion Dies**: Profile dies, feeder plates, backers, and bolsters - **Extrusion Mandrels**: For tube and hollow profile extrusion - **Containers and Liners**: For aluminum extrusion presses - **Die Rings and Blocks**: Critical extrusion components #### **Forging Applications** - **Hammer and Press Forging Dies**: For steel and non-ferrous forging - **Forging Die Inserts**: Requiring superior toughness - **Trimming and Punching Dies**: For hot forging operations - **Forging Mandrels and Punches**: Subject to high impact loads #### **Die Casting Tooling** - **Aluminum Die Casting Dies**: Where toughness is critical - **Core Pins and Ejector Pins**: Subject to bending stresses - **Die Casting Machine Components**: Plungers, goosenecks, nozzles #### **Aerospace and Defense** - **Structural Components**: Aircraft and missile components - **Rocket Motor Cases**: High-strength applications - **Landing Gear Components**: Requiring high toughness #### **Plastic Molding** - **Molds for Engineering Plastics**: Such as nylon, polycarbonate - **Hot Runner Systems**: Manifolds and nozzles #### **General Hot Work Applications** - **Hot Shear Blades**: For cutting hot materials - **Hot Forming Tools**: Punches, dies, and mandrels - **Glass Molding Tools**: Where thermal cycling is involved --- ### **Machining & Fabrication Notes** #### **Machinability (Annealed Condition)** - **Rating**: 70-80% of B1112 free-machining steel - **Recommended Tools**: HSS or carbide tools both suitable - **Cutting Speeds**: 25-35 m/min (80-115 SFM) for turning operations - **Feed Rates**: Moderate to heavy feeds possible - **Coolant**: Standard soluble oils adequate - **Advantage**: Excellent machinability for a hot work steel #### **Grindability** - **Relative Rating**: 80-90 (vs. 100 for annealed O1 tool steel) - **Abrasive Recommendations**: Standard aluminum oxide wheels - **Wheel Maintenance**: Normal dressing intervals sufficient - **Coolant**: Standard grinding coolant adequate - **Special Note**: One of the most grindable hot work steels #### **EDM Machining** - Excellent suitability for wire and sinker EDM - Good surface finish achievable - Standard EDM parameters apply - Stress relief after roughing operations recommended #### **Welding and Repair** - Good weldability with proper procedures - Preheating to 300-400°C (570-750°F) recommended - Post-weld heat treatment essential - Widely used for die repair and maintenance --- ### **Quality Assurance & Metallurgical Standards** #### **Microstructural Requirements** - **Carbide Distribution**: Fine, uniformly distributed carbides - **Grain Size**: ASTM 6 or finer - **Decarburization**: ≤0.25 mm per side on rough stock - **Non-Metallic Inclusions**: ASTM E45 Method A, ≤2.5 total rating #### **Testing & Certification** - Full chemical analysis verification - Hardness testing throughout production - Microstructural evaluation available upon request - Ultrasonic testing available for critical applications - Standard material test reports with shipments --- ### **Available Product Forms** | Form | Standard Sizes | Condition | Surface Finish | |------|---------------|-----------|---------------| | **Round Bars** | 10mm - 600mm diameter | Annealed | Black, Peeled, Ground | | **Flat Bars and Plate** | 10-300mm thickness | Annealed | Mill, Ground, Machined | | **Blocks** | Various dimensions | Annealed | Rough or finish machined | - **Special Forms**: Forged blanks, pre-machined components, and custom shapes --- ### **Technical Comparison** | Property | LSS™ H11 | H13 | H10 | H21 | |----------|-----------|-----|-----|-----| | **Toughness** | **Excellent** | Good | Very Good | Fair | | **Thermal Fatigue Resistance** | Very Good | Excellent | Very Good | Fair | | **High-Temperature Strength** | Good | Very Good | Good | Excellent | - **Wear Resistance** | Good | Very Good | Good | Excellent | - **Air-Hardening Capability** | **Excellent** | Good | Fair | Poor | - **Machinability** | **Excellent** | Good | Good | Fair | - **Primary Application** | High-toughness | Versatile | Die casting | High-temp | --- ### **Surface Treatment Compatibility** LSS™ H11 is compatible with various surface treatments: - **Nitriding**: Gas, plasma, or salt bath nitriding for enhanced surface hardness - **Coatings**: PVD and CVD coatings for specific applications - **Surface Engineering**: Various treatments to enhance performance --- ### **Economic Considerations** 1. **Material Cost**: Moderate – cost-effective for many applications 2. **Tool Life**: Excellent service life in appropriate applications 3. **Fabrication Cost**: Low machining and grinding costs 4. **Maintenance Cost**: Easy to repair and maintain 5. **Overall Value**: Excellent performance-to-cost ratio --- ### **Technical Support** Latrobe provides comprehensive technical support for LSS™ H11: - **Application Engineering**: Guidance on tool design and heat treatment - **Troubleshooting**: Assistance with tool performance issues - **Heat Treatment Support**: Protocols for optimal performance - **Field Support**: On-site technical assistance available --- **Select Latrobe LSS™ H11 Hot Work Tool Steel** for applications requiring exceptional toughness combined with good hot hardness and thermal fatigue resistance. This air-hardening chromium hot work steel provides reliable performance in demanding applications such as aluminum extrusion dies, forging tools, and structural components where impact resistance is critical. LSS™ H11 represents an optimal balance of toughness, machinability, and hot work performance, offering excellent service life and ease of fabrication. When superior toughness is the primary requirement in hot work applications, LSS™ H11 delivers proven performance and outstanding value. -:- For detailed product information, please contact sales. -: Latrobe LSS™ H11 Hot Work Tool Steel (ASTM H11) Specification Dimensions Size： Diameter 20-1000 mm Length <7166 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. -: Latrobe LSS™ H11 Hot Work Tool Steel (ASTM H11) Properties -:- For detailed product information, please contact sales. -:

Applications of Latrobe LSS™ H11 Hot Work Tool Steel Wire (ASTM H11) -:- For detailed product information, please contact sales. -: Chemical Identifiers Latrobe LSS™ H11 Hot Work Tool Steel Wire (ASTM H11) -:- For detailed product information, please contact sales. -:

Packing of Latrobe LSS™ H11 Hot Work Tool Steel Wire (ASTM H11) -:- 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 Wire 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 3637 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