Latrobe,LSS™ 420 Supreme Plastic Mold Steel Sheet,Plate (AISI 420)

Latrobe LSS™ 420 Supreme Plastic Mold Steel Sheet/Plate (AISI 420) Product Information -:- For detailed product information, please contact sales. -: Latrobe LSS™ 420 Supreme Plastic Mold Steel Sheet/Plate (AISI 420) Synonyms -:- For detailed product information, please contact sales. -:

Latrobe LSS™ 420 Supreme Plastic Mold Steel (AISI 420) Product Information -:- For detailed product information, please contact sales. -: # **Product Datasheet: Latrobe LSS™ 420 Supreme Plastic Mold Steel** ## **Overview** Latrobe LSS™ 420 Supreme represents the pinnacle of premium martensitic stainless mold steel technology. Engineered specifically for the most demanding plastic injection molding applications, this AISI 420-based alloy combines exceptional corrosion resistance with superior polishability and enhanced mechanical properties. The "Supreme" designation indicates an advanced manufacturing process that delivers ultra-clean steel with exceptional microstructural homogeneity, making it ideal for critical applications where flawless surface finish, dimensional stability, and extended tool life are paramount. ## **Key Features & Advantages** - **Ultra-High Polishability** - Capable of achieving A1 diamond finish (Ra < 0.010 μm) for optical-quality surfaces - **Enhanced Corrosion Resistance** - Superior resistance to PVC acid attack, moisture, and corrosive plastic additives - **Exceptional Microstructural Homogeneity** - Advanced melting technology ensures uniform carbide distribution - **Improved Machinability** - Optimized for reduced tool wear and enhanced EDM performance - **Excellent Dimensional Stability** - Minimal distortion during heat treatment and machining - **Superior Wear Resistance** - Enhanced surface durability for high-volume production molds ## **International Standards & Cross-References** | **Standard System** | **Designation** | **Comparable Grades** | |---------------------|-----------------|------------------------| | **AISI/SAE** | 420 Modified | Proprietary Supreme grade | | **UNS** | S42000 | - | | **DIN/EN** | 1.2083 ESR | Enhanced version | | **ISO** | 35CrMo13 | Premium variant | | **JIS** | SUS420J2 | Superior quality | | **Common Equivalents** | - | Böhler M238 / Uddeholm Stavax Supreme / Thyssen 1.2083S | ## **Chemical Composition** | **Element** | **Content (%)** | **Function** | |-------------|-----------------|--------------| | **Carbon (C)** | 0.38-0.42 | Hardness & wear resistance | | **Chromium (Cr)** | 13.0-14.0 | Corrosion resistance | | **Silicon (Si)** | ≤ 0.80 | Deoxidizer, strength | | **Manganese (Mn)** | ≤ 0.70 | Hardening response | | **Molybdenum (Mo)** | 0.15-0.35 | Hardenability & strength | | **Vanadium (V)** | 0.10-0.20 | Grain refinement | | **Sulfur (S)** | ≤ 0.005 | Ultra-low for polishability | | **Phosphorus (P)** | ≤ 0.015 | Ultra-low for toughness | *Note: Proprietary modifications enhance polishability and corrosion resistance beyond standard AISI 420.* ## **Physical Properties** | **Property** | **Value** | **Conditions** | |--------------|-----------|----------------| | **Density** | 7.78 g/cm³ | 20°C | | **Thermal Conductivity** | 28.0 W/m·K | 20°C | | **Specific Heat Capacity** | 460 J/kg·K | 20°C | | **Coefficient of Thermal Expansion** | 10.5 × 10⁻⁶/K | 20-100°C | | **Modulus of Elasticity** | 215 GPa | 20°C | | **Magnetic Properties** | Ferromagnetic | All conditions | ## **Mechanical Properties** ### **Pre-Hardened Condition (As Supplied)** | **Property** | **Value** | **Test Method** | |--------------|-----------|-----------------| | **Hardness** | 30-34 HRC | ASTM E18 | | **Tensile Strength** | 1000-1100 MPa | ASTM E8 | | **Yield Strength (0.2%)** | 850-950 MPa | ASTM E8 | | **Elongation** | 12-15% | ASTM E8 | | **Reduction of Area** | 35-40% | ASTM E8 | | **Impact Toughness** | 25-30 J | ASTM E23 | ### **Hardened & Tempered Condition** | **Tempering Temperature** | **Hardness (HRC)** | **Application** | |---------------------------|-------------------|-----------------| | **180-200°C** | 52-54 | Maximum hardness | | **250-300°C** | 50-52 | Optimal balance | | **350-400°C** | 48-50 | High toughness | | **400-450°C** | 46-48 | Maximum toughness | ## **Heat Treatment Specifications** ### **Annealing** - **Process:** Heat to 840-860°C (1545-1580°F), hold 2-4 hours - **Cooling:** Slow furnace cool at 15-20°C/hour to 600°C (1110°F), then air cool - **Resulting Hardness:** ≤ 235 HB ### **Hardening** - **Preheat:** 750-800°C (1380-1470°F) - essential for dimensional stability - **Austenitizing:** 980-1050°C (1795-1920°F), hold 20-30 minutes per inch of thickness - **Quenching:** Oil or forced air (for sections < 100mm) - **Immediate Tempering:** Required within 1 hour of quenching ### **Tempering** - **Temperature Range:** 180-450°C (355-840°F) - **Cycles:** Double tempering recommended - **Hold Time:** Minimum 2 hours per inch of thickness ## **Processing Characteristics** ### **Machinability** - **Relative Machinability:** 65% (compared to 1% for AISI 1212 steel) - **Cutting Speed:** 40-60 m/min with carbide tools - **Feed Rate:** 0.15-0.25 mm/rev - **Coolant:** Required for optimum results ### **EDM Performance** - **Material Removal Rate:** 300-400 mm³/min (roughing) - **Surface Finish:** Ra 1.6-3.2 μm achievable - **White Layer:** Minimal with proper settings - **Recommended:** Fine-finish EDM for critical surfaces ### **Polishing Procedure** 1. **Initial Grinding:** 180-240 grit diamond wheel 2. **Intermediate Steps:** 320, 400, 600 grit diamond paste 3. **Final Polish:** 1200 grit diamond compound for optical finish 4. **Mirror Finish:** 1-3 μm diamond suspension for A1 finish ## **Typical Applications** ### **Primary Applications** 1. **Optical Components** - Camera lenses and housings - LED light guides and diffusers - Optical sensor covers - Medical device lenses 2. **Consumer Electronics** - Smartphone and tablet exteriors - High-gloss appliance panels - Transparent display covers - Wearable device components 3. **Automotive Components** - Light covers and lenses - Instrument panel covers - Decorative trim elements - Reflector housings 4. **Medical & Pharmaceutical** - Transparent medical device housings - Diagnostic equipment components - Pharmaceutical packaging molds - Laboratory equipment parts 5. **Corrosive Material Molds** - PVC pipe fittings and connectors - Flame-retardant (FR) plastic components - Acid-releasing plastic materials - Chemical container molds ### **Component Applications** - Injection mold cavities and cores - Hot runner system components - Ejector pins and sleeves - Slideways and lifters - High-wear inserts ## **Quality Certifications** - ISO 9001:2015 Quality Management System - ASTM A681 Standard Specification for Tool Steel - Clean Steel Standards: ASTM E45 Method D ≤ 0.5 - Traceability: Full heat-to-component traceability ## **Technical Support & Services** - Application engineering support - Heat treatment consultation - Machining parameter optimization - Failure analysis and troubleshooting ## **Disclaimer** Properties listed are typical values. Actual performance may vary based on specific processing conditions, heat treatment, and application requirements. Users should conduct appropriate testing for their specific applications. --- **Latrobe Specialty Metals** *Precision Engineered Steel Solutions* www.latrobe.com -:- For detailed product information, please contact sales. -: Latrobe LSS™ 420 Supreme Plastic Mold Steel (AISI 420) Specification Dimensions Size： Diameter 20-1000 mm Length <7215 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™ 420 Supreme Plastic Mold Steel (AISI 420) Properties -:- For detailed product information, please contact sales. -:

Applications of Latrobe LSS™ 420 Supreme Plastic Mold Steel Sheet,Plate (AISI 420) -:- For detailed product information, please contact sales. -: Chemical Identifiers Latrobe LSS™ 420 Supreme Plastic Mold Steel Sheet,Plate (AISI 420) -:- For detailed product information, please contact sales. -:

Packing of Latrobe LSS™ 420 Supreme Plastic Mold Steel Sheet/Plate (AISI 420) -:- 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 Sheet/Plate 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 3686 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