Latrobe,Viscount 20® Free Machining Tool Steel Tube,Pipe (ASTM H13S)

Latrobe Viscount 20® Free Machining Tool Steel Tube (ASTM H13S) Product Information -:- For detailed product information, please contact sales. -: Latrobe Viscount 20® Free Machining Tool Steel Tube (ASTM H13S) Synonyms -:- For detailed product information, please contact sales. -:

Latrobe Viscount 20® Free Machining Tool Steel (ASTM H13S) Product Information -:- For detailed product information, please contact sales. -: # **Latrobe Viscount 20® Free-Machining Hot Work Tool Steel (ASTM H13S)** ## **Premium Sulfurized H13 Variant for Enhanced Machinability** Latrobe Viscount 20® represents a specialized free-machining variant of the industry-standard H13 hot work tool steel, engineered to provide dramatically improved machinability while maintaining the essential thermal and mechanical properties of conventional H13. Through controlled sulfur addition and specialized processing, this grade offers significant productivity advantages in machining operations while remaining suitable for many hot work applications where extreme thermal fatigue resistance is not the primary requirement. The "Viscount 20" designation reflects its premium status and distinctive cutting performance characteristics. --- ### **Key Features & Benefits** - **Exceptional Machinability**: Dramatically improved cutting performance - typically 30-50% better than standard H13 - **Good Hot Work Properties**: Maintains core H13 characteristics including air-hardening capability and moderate hot hardness - **Enhanced Chip Breaking**: Sulfide inclusions promote chip fragmentation, improving surface finish and tool life - **Reduced Cutting Forces**: Lower power consumption and reduced machine tool wear during machining operations - **Maintained Dimensional Stability**: Good heat treatment response with controlled distortion characteristics - **Cost-Effective Fabrication**: Significant reduction in machining time and tooling costs --- ### **Chemical Composition (Typical %, ASTM A681 H13 Modified with Sulfur)** | Element | Carbon (C) | Chromium (Cr) | Molybdenum (Mo) | Vanadium (V) | Silicon (Si) | Manganese (Mn) | Sulfur (S) | |---------|------------|---------------|-----------------|--------------|--------------|----------------|------------| | **Content** | 0.35 - 0.45 | 4.75 - 5.50 | 1.10 - 1.75 | 0.80 - 1.20 | 0.80 - 1.20 | 0.20 - 0.60 | 0.08 - 0.15 | *Note: Viscount 20® maintains the fundamental H13 alloy composition while incorporating controlled sulfur addition (typically 0.10-0.13%) to form manganese sulfide inclusions that dramatically improve machinability. The balance of other elements is optimized to mitigate potential adverse effects of sulfur on hot work properties.* --- ### **Physical & Mechanical Properties** | Property | Value / Description | |----------|---------------------| | **Density** | 7.79 g/cm³ (slightly reduced due to sulfide content) | | **Thermal Conductivity** | 24-28 W/m·K at 20°C | | **Specific Heat Capacity** | 0.46 kJ/kg·K at 20°C | | **Coefficient of Thermal Expansion** | 11.0 × 10⁻⁶/K (20-400°C) | | **Hardness (Annealed)** | 187-229 HB | | **Hardness (Heat Treated)** | **42-50 HRC** (typical working range) | | **Tensile Strength** | 1,550-1,950 MPa (at 46 HRC) | | **Yield Strength** | 1,350-1,750 MPa (at 46 HRC) | | **Modulus of Elasticity** | 200-210 GPa | | **Impact Toughness** | Moderate - reduced compared to standard H13 due to sulfide content | | **Machinability Rating** | **75-90%** of B1112 free-machining steel | --- ### **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**: 187-229 HB - **Special Note**: Similar to standard H13 but with slightly improved stability #### **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**: **1000-1030°C (1830-1885°F)** - similar to standard H13 3. **Soak Time**: 20-40 minutes per inch of thickness 4. **Quenching**: Air cooling standard; oil for maximum hardness 5. **Immediate Handling**: Cool to below 65°C (150°F) before tempering #### **Tempering** - **Temperature Range**: 540-620°C (1005-1150°F) - **Cycles**: Double tempering recommended for dimensional stability - **Duration**: 2 hours per cycle minimum - **Target Hardness**: 42-50 HRC typically achieved at 560-600°C (1040-1110°F) - **Special Consideration**: Slightly reduced secondary hardening compared to standard H13 --- ### **International Standards & Equivalent Grades** | Standard | Grade Designation | Notes | |----------|-------------------|-------| | **ASTM** | Modified H13 (H13S type) | Sulfurized variant of A681 H13 | | **Proprietary** | Viscount 20® | Latrobe Special Steel trademark | | **Similar Grades** | H13 FM, H13 Easy-Machining | Various free-machining H13 variants | | **ISO** | Not standardized | Considered a proprietary modification | | **DIN** | 1.2344 + S | German equivalent with sulfur addition | | **AISI** | H13 Modified | American Iron and Steel Institute reference | --- ### **Typical Applications** #### **Prototype and Short-Run Tooling** - **Prototype Die Casting Dies**: For product development and testing - **Low-Volume Production Tools**: Where machining cost dominates total tooling cost - **Experimental Tooling**: For process development and evaluation #### **Complex Geometry Components** - **Intricate Die Components**: With complex internal passages and detailed features - **Precision Tooling Elements**: Requiring extensive machining operations - **Multi-Cavity Mold Inserts**: With significant material removal requirements #### **Educational and Training Applications** - **Toolmaking Training**: For technical schools and apprenticeship programs - **Demonstration Tools**: For machining and tooling demonstrations - **Educational Projects**: Where machinability is prioritized over ultimate performance #### **Maintenance and Repair Components** - **Replacement Parts**: For maintenance of existing tooling - **Repair Inserts**: Where extensive machining is required for fitting - **Adaptor Plates and Fixtures**: For tooling modification and adaptation #### **Non-Critical Hot Work Applications** - **Lower-Stress Die Casting Components**: Ejector pins, guide pins, support pillars - **Hot Work Fixtures**: Clamps, supports, and handling tools - **Auxiliary Tooling Components**: Not subject to severe thermal cycling --- ### **Machining & Fabrication Notes** #### **Machinability (Annealed Condition)** - **Rating**: **75-90%** of B1112 free-machining steel (exceptional for hot work steel) - **Cutting Speeds**: 40-60 m/min (130-200 SFM) for turning operations with carbide tools - **Material Removal Rates**: 30-50% higher than standard H13 - **Tool Life**: 2-3 times longer than with standard H13 - **Surface Finish**: Superior achievable finish due to improved chip control - **Power Consumption**: 20-30% reduction compared to standard H13 #### **Grindability** - **Relative Rating**: 80-90 (vs. 100 for annealed O1 tool steel) - **Special Consideration**: Sulfide inclusions may affect grinding wheel performance - **Coolant Requirements**: Standard grinding coolant adequate - **Surface Finish**: Good grindability with proper wheel selection #### **EDM Machining** - Good EDM characteristics - Slightly faster material removal rates than standard H13 - Good surface finish achievable - Standard EDM parameters applicable --- ### **Quality Assurance & Metallurgical Standards** #### **Microstructural Characteristics** - **Sulfide Distribution**: Controlled manganese sulfide inclusions evenly distributed - **Inclusion Morphology**: Type II manganese sulfides (elongated during working) - **Carbide Distribution**: Similar to standard H13 with slightly modified morphology - **Grain Size**: ASTM 6 or finer - **Decarburization**: ≤0.25 mm per side on rough stock #### **Testing & Certification** - Complete chemical analysis with sulfur verification - Hardness testing throughout production - Machinability testing available - Standard material test reports with special note of sulfur content --- ### **Available Product Forms** | Form | Standard Sizes | Condition | Surface Finish | |------|---------------|-----------|---------------| | **Round Bars** | 10mm - 300mm diameter | Annealed | Black, Peeled, Ground | | **Flat Bars and Plate** | 10-150mm thickness | Annealed | Mill, Ground | | **Blocks** | Various dimensions | Annealed | Rough or finish machined | | **Squares** | 10-150mm | Annealed | As-rolled, Ground | --- ### **Technical Comparison: Viscount 20® vs. Standard H13** | Property | Viscount 20® | Standard H13 | Notes | |----------|--------------|--------------|-------| | **Machinability** | **Excellent** | Good | Primary advantage | | **Impact Toughness** | Moderate | Very Good | Reduced due to sulfides | | **Thermal Fatigue** | Good | Excellent | Not for severe cycling | | **Hot Hardness** | Good | Very Good | Adequate for many apps | | **Wear Resistance** | Good | Very Good | Slightly reduced | | **Chip Control** | **Excellent** | Fair | Dramatic improvement | | **Cost per Part** | **Lower** | Higher | Due to machining savings | --- ### **Design and Application Considerations** 1. **Not Recommended For**: - Severe thermal cycling applications - Critical die casting cavities subject to extreme thermal fatigue - Applications requiring maximum impact toughness - High-pressure die casting of complex thin-wall components 2. **Ideal Applications**: - Prototype tooling with extensive machining - Tooling components with complex internal features - Low to moderate production volume applications - Educational and training applications --- ### **Economic Considerations** 1. **Material Cost**: Similar to standard H13 2. **Machining Cost**: **30-50% reduction** in typical applications 3. **Tooling Cost**: Reduced cutting tool consumption 4. **Productivity**: Increased throughput in machining operations 5. **Overall Value**: Excellent where machining dominates total cost --- ### **Technical Support** Latrobe provides specialized technical support for Viscount 20®: - **Machining Optimization**: Guidance on optimal cutting parameters - **Application Engineering**: Assistance with appropriate applications - **Troubleshooting**: Support for machining and performance issues - **Technical Data**: Comprehensive machining recommendations --- **Select Latrobe Viscount 20® Free-Machining Hot Work Tool Steel** when machining productivity is the primary concern and the thermal fatigue requirements are moderate. This specialized grade delivers exceptional machinability while maintaining sufficient hot work properties for many applications. Viscount 20® represents an optimal solution for prototype tooling, complex components requiring extensive machining, educational applications, and situations where machining costs significantly impact total project economics. When "time to first part" or machining efficiency drives project success, Viscount 20® provides a proven solution that balances machinability with functional performance. -:- For detailed product information, please contact sales. -: Latrobe Viscount 20® Free Machining Tool Steel (ASTM H13S) Specification Dimensions Size： Diameter 20-1000 mm Length <7170 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 Viscount 20® Free Machining Tool Steel (ASTM H13S) Properties -:- For detailed product information, please contact sales. -:

Applications of Latrobe Viscount 20® Free Machining Tool Steel Tube (ASTM H13S) -:- For detailed product information, please contact sales. -: Chemical Identifiers Latrobe Viscount 20® Free Machining Tool Steel Tube (ASTM H13S) -:- For detailed product information, please contact sales. -:

Packing of Latrobe Viscount 20® Free Machining Tool Steel Tube (ASTM H13S) -:- 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 Tube 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 3641 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