Spherical Latrobe LSS™ 4142 Alloy Steel Powder (AISI 4142)

Latrobe LSS™ 4142 Alloy Steel Spherical Powder (AISI 4142) Product Information -:- For detailed product information, please contact sales. -: Latrobe LSS™ 4142 Alloy Steel Spherical Powder (AISI 4142) Synonyms -:- For detailed product information, please contact sales. -: -:- For detailed product information, please contact sales. -: Spherical Latrobe LSS™ 4142 Alloy Steel Powder (AISI 4142) characteristics -:- For detailed product information, please contact sales. -: Spherical Latrobe LSS™ 4142 Alloy Steel Powder (AISI 4142) Particle Size -:- For detailed product information, please contact sales. -: -:- -:- 0-15μm ,5-25μm, 15-45μm, 15-53μm,20-63um, 45-75μm, 45-105μm, 45-150μm ,75-150μm. (Various granularities can be customized according to customer requirements) -:- For detailed product information, please contact sales. -:

Spherical Latrobe LSS™ 4142 Alloy Steel Powder (AISI 4142) Applicable processes -:- For detailed product information, please contact sales. -: Laser/electron beam additive manufacturing (SLM/EBM, 3D printing) Direct laser deposition (DLD) Used in thermal spray (TSA) Powder hot isostatic pressing (HIP) Metal injection molding (MIM) Powder metallurgy (PM) Laser cladding (LC), etc. -:- For detailed product information, please contact sales. -: Spherical Latrobe LSS™ 4142 Alloy Steel Powder (AISI 4142) Chemical Composition -:- For detailed product information, please contact sales. -: -:- For detailed product information, please contact sales. -: Latrobe LSS™ 4142 Alloy Steel (AISI 4142) Product Information -:- For detailed product information, please contact sales. -: # **Product Introduction: Latrobe LSS™ 4142 Alloy Steel (AISI 4142 / ASTM A29)** **Latrobe LSS™ 4142** is a premium-grade, **medium-carbon chromium-molybdenum (Cr-Mo) alloy steel** that offers enhanced strength and hardenability compared to the standard 4140 grade. As a higher-carbon variant within the 41xx series, AISI 4142 provides excellent through-hardening characteristics, making it particularly suitable for applications requiring higher surface and core hardness, improved wear resistance, and greater load-bearing capacity in larger cross-sections. This versatile steel maintains the good toughness and machinability characteristics of the 41xx family while delivering superior strength properties through proper heat treatment. The key advantage of LSS™ 4142 lies in its **ability to achieve higher hardness and tensile strength levels than 4140 at equivalent tempering temperatures**, while maintaining reasonable toughness and ductility. This makes it an ideal choice for components subjected to heavy loads, abrasive wear, and high stress where maximum strength-to-weight ratio is critical. --- ## **1. Chemical Composition** Latrobe LSS™ 4142 features a higher carbon chromium-molybdenum alloy system optimized for enhanced strength and hardenability: | Element | Content (%) | Function | | :--- | :--- | :--- | | Carbon (C) | 0.40 - 0.45 | **Increased carbon** provides higher strength and hardness | | Chromium (Cr) | 0.80 - 1.10 | Enhances hardenability, wear and corrosion resistance | | Molybdenum (Mo) | 0.15 - 0.25 | Increases hardenability, strength, and creep resistance | | Manganese (Mn) | 0.75 - 1.00 | Improves hardenability and strength | | Silicon (Si) | 0.15 - 0.30 | Increases strength and oxidation resistance | | Phosphorus (P) | ≤ 0.035 | Residual element (controlled) | | Sulfur (S) | ≤ 0.040 | Residual element (controlled) | | **Balance** | Iron (Fe) | | *(Composition conforms to AISI 4142 and ASTM A29 specifications. Note the higher carbon range compared to 4140's 0.38-0.43%)* --- ## **2. Physical & Mechanical Properties** ### **As-Annealed/Normalized Condition:** - **Hardness:** 201 - 235 HB (Brinell) [Higher than 4140] - **Tensile Strength:** 690 - 725 MPa (100 - 105 ksi) - **Yield Strength:** 435 - 485 MPa (63 - 70 ksi) - **Elongation:** 22 - 25% - **Reduction of Area:** 50 - 55% - **Machinability:** 60% (relative to 1212 steel) [Slightly lower than 4140] - **Density:** 7.85 g/cm³ (0.284 lb/in³) - **Modulus of Elasticity:** 205 GPa (29.7 × 10⁶ psi) ### **Heat Treatment Characteristics:** - **Hardenability Index (DI):** Approximately 4.0 inch [Higher than 4140's 3.4"] - **Critical Cooling Rate:** Moderate - **Forging Temperature:** 1150°C - 900°C (2100°F - 1650°F) - **Annealing Temperature:** 830°C - 860°C (1525°F - 1580°F) - **Normalizing Temperature:** 870°C - 900°C (1600°F - 1650°F) ### **Quenched & Tempered Properties:** *(Oil quenched from 845°C/1550°F)* | Temper Temperature | Hardness (HRC) | Tensile Strength | Yield Strength | % Elongation | % RA | Impact Energy (Charpy V) | | :--- | :--- | :--- | :--- | :--- | :--- | :--- | | **205°C (400°F)** | 54-58 | 1860-2000 MPa (270-290 ksi) | 1725-1860 MPa (250-270 ksi) | 9-11% | 30-40% | 15-25 J (11-18 ft-lb) | | **425°C (800°F)** | 44-48 | 1380-1520 MPa (200-220 ksi) | 1240-1380 MPa (180-200 ksi) | 13-16% | 45-55% | 27-41 J (20-30 ft-lb) | | **540°C (1000°F)** | 37-41 | 1100-1210 MPa (160-175 ksi) | 965-1070 MPa (140-155 ksi) | 16-20% | 52-62% | 41-61 J (30-45 ft-lb) | | **650°C (1200°F)** | 27-31 | 725-830 MPa (105-120 ksi) | 620-725 MPa (90-105 ksi) | 20-24% | 60-70% | 68-95 J (50-70 ft-lb) | *Note: Compared to 4140, 4142 achieves approximately 1-2 HRC higher hardness and 70-140 MPa (10-20 ksi) higher strength at equivalent tempering temperatures, with slightly reduced toughness and ductility.* --- ## **3. International Standards & Cross-Reference** | Country/Region | Standard | Designation | Equivalent/Specification | | :--- | :--- | :--- | :--- | | **United States** | AISI/SAE | 4142 | G41420 | | | ASTM | A29 | 4142 | | | UNS | G41420 | | | **Germany** | DIN | 1.7227 | 42CrMo4+ (higher carbon variant) | | **European Union** | EN | 1.7227 | 42CrMo4+ | | **Japan** | JIS | G4105 | SCM440H (higher carbon grade) | | **United Kingdom** | BS | 708A42 | 709M42 | | **France** | AFNOR | 42CD4TS | | | **Italy** | UNI | 38CrMo4KB | | | **China** | GB | 42CrMoA | | | **International** | ISO | 683-1 | 42CrMo4 (modified) | --- ## **4. Product Applications** ### **Automotive & Transportation:** - **Heavy-Duty Axle Shafts and Drive Shafts** - **High-Strength Gears and Sprockets** - **Crankshafts for High-Performance Engines** - **Suspension Components for Heavy Vehicles** - **Wheel Hubs and Spindles for Trucks and Buses** ### **Heavy Machinery & Equipment:** - **Hydraulic Cylinder Rods for High-Pressure Systems** - **Machine Tool Spindles and Arbors** - **Forging Die Inserts and Blocks** - **Press Components and Ejector Pins** - **Roller and Ball Bearing Races** ### **Oil, Gas & Mining:** - **Drill Collars and Heavy-Wall Drill Pipe** - **Wellhead Components and Valve Stems** - **Pump Shafts for High-Pressure Applications** - **Crusher Rolls and Hammer Pins** - **Mining Drill Steel and Rods** ### **Agricultural & Construction:** - **Tractor Transmission Gears and Shafts** - **Harvester and Combine Components** - **Excavator Bucket Pins and Bushings** - **Crane and Hoist Shafts** ### **Specialized Applications:** - **High-Strength Bolts and Fasteners** (ASTM A193 B7M, etc.) - **Tool Holders and Clamping Components** - **Molds and Dies for Plastic Injection** - **Military and Defense Components** --- ## **5. Processing Guidelines** ### **Machining (Annealed/Normalized State):** - **Turning Speed:** 45-65 m/min (150-215 ft/min) with carbide tools - **Feed Rate:** 0.20-0.35 mm/rev (0.008-0.014 in/rev) - **Depth of Cut:** Up to 4mm (0.160") roughing - **Tool Geometry:** Sharp, positive rake angles essential - **Coolant:** Required for heat dissipation and chip control - **Note:** Higher carbon content requires slightly more conservative machining parameters than 4140 ### **Heat Treatment Options:** **1. Annealing:** - Temperature: 830°C - 860°C (1525°F - 1580°F) - Cooling: Furnace cool to 600°C (1110°F), then air cool - Result: 201-235 HB for machining **2. Normalizing:** - Temperature: 870°C - 900°C (1600°F - 1650°F) - Cooling: Air cool - Result: Refined grain structure for subsequent hardening **3. Quenching & Tempering (Recommended Cycle):** - Preheat: 650°C (1200°F) for complex shapes or large sections - Austenitizing: 830°C - 860°C (1525°F - 1580°F) for 20-30 min/inch - Quenching: Agitated oil (preferred), water for simple shapes <25mm (1") - Tempering: Immediately after quenching to 205°C - 650°C (400°F - 1200°F) for 1-2 hours per inch - Cooling: Air cool after tempering **4. Induction or Flame Hardening:** - Surface Hardness: 55-60 HRC achievable - Case Depth: 1.5-8mm (0.060-0.315") typical - Core Properties: Maintain 28-35 HRC for toughness ### **Welding Considerations:** - **Weldability:** Fair to Poor (requires careful procedures) - **Preheat:** 205°C - 315°C (400°F - 600°F) mandatory - **Interpass Temperature:** Maintain above 150°C (300°F) - **Post-Weld Heat Treatment:** Required - stress relieve at 595°C - 650°C (1100°F - 1200°F) - **Filler Metals:** Low hydrogen electrodes (AWS E11018, E12018) or matching composition wires - **Technique:** Preheat, weld, slow cool, then temper ### **Surface Treatments:** - **Nitriding:** Excellent response (typical case: 500-750 HV, 0.1-0.5mm depth) - **Carburizing:** Can be carburized for deeper case hardening - **Hard Chrome Plating:** Good adhesion with proper surface preparation - **Phosphate Coating:** For corrosion resistance and paint adhesion --- ## **6. Technical Comparison** ### **4142 vs. 4140:** | Property | 4142 Advantage | 4140 Advantage | | :--- | :--- | :--- | | **Strength** | **Higher** (by ~5-10%) | Lower | | **Hardness** | **Higher** (by 1-2 HRC) | Lower | | **Hardenability** | **Better** (DI ~4.0" vs 3.4") | Good | | **Toughness** | Slightly lower | **Higher** | | **Ductility** | Slightly lower | **Higher** | | **Machinability** | Slightly lower (60% vs 65%) | **Better** | | **Weldability** | Slightly more challenging | **Better** | ### **4142 vs. 4150:** | Property | 4142 | 4150 | | :--- | :--- | :--- | | **Carbon Content** | 0.40-0.45% | 0.48-0.53% | | **Maximum Strength** | Lower | **Higher** | | **Toughness** | **Higher** | Lower | | **Machinability** | **Better** | More difficult | | **Applications** | General high-strength | Maximum strength applications | ### **Optimal Application Selection Guide:** - **Choose 4142 over 4140 when:** Higher strength is needed in larger sections, improved wear resistance required, or when higher hardness can reduce component size/weight. - **Choose 4140 over 4142 when:** Maximum toughness is critical, welding is extensive, or machinability is a primary concern. - **Choose 4150 over 4142 when:** Absolute maximum strength is required and toughness is secondary. --- ## **7. Available Forms & Specifications** ### **Standard Product Forms:** - **Round Bars:** 10mm to 500mm diameter (0.375" to 20") - **Hexagon Bars:** 10mm to 100mm across flats - **Square Bars:** 10mm to 150mm - **Flat Bars:** 6mm to 300mm thick - **Billets & Blooms:** For forging applications - **Forged Shapes:** Custom configurations - **Plate:** Up to 250mm thick ### **Special Conditions:** - **Annealed:** For optimum machinability - **Normalized:** For consistent properties before final heat treatment - **Quenched & Tempered:** To specified hardness levels (typically 28-32 HRC or 35-40 HRC) - **Stress Relieved:** For dimensional stability ### **Quality Levels:** - **Commercial Quality:** General industrial applications - **Special Quality:** Enhanced cleanliness, controlled grain size - **Aircraft Quality:** Per AMS 6381, 6382 or similar specifications - **Ultrasonic Tested:** Per ASTM A388 for critical applications --- ## **8. Special Considerations for Design** ### **Design Recommendations:** - **Section Size:** Full hardening achievable up to 75mm (3") diameter in oil quench - **Stress Concentrations:** Avoid sharp corners - minimum radius 1.5mm (0.060") - **Heat Treatment Distortion:** Allow 0.1-0.2% dimensional change during quenching - **Surface Finish:** Ground surfaces recommended for fatigue-critical applications ### **Fatigue Performance:** - **Endurance Limit:** Approximately 50-55% of tensile strength - **Surface Condition Factor:** Critical - polished surfaces significantly improve fatigue life - **Notch Sensitivity:** Moderate - proper fillet radii essential ### **Corrosion Resistance:** - **Atmosphere:** Similar to low-alloy steels - requires protection - **Industrial Environments:** Coating or plating recommended - **Submerged Service:** Not recommended without cathodic protection --- **Technical Summary:** Latrobe LSS™ 4142 represents an **optimal balance between the versatility of 4140 and the higher strength capability of 4150**, offering enhanced performance for applications requiring superior strength and wear resistance without the processing challenges of higher carbon grades. Its increased carbon content provides approximately 5-10% higher strength than standard 4140 while maintaining reasonable toughness and processability. This makes 4142 particularly valuable for components in heavy machinery, automotive drivetrains, and industrial equipment where increased load capacity or extended service life is required. **Economic Advantage:** While offering higher performance than 4140, 4142 typically comes at only a modest premium, providing excellent value for applications that can benefit from its enhanced properties. The extended service life of components made from 4142 often justifies the slightly higher material cost through reduced maintenance and downtime. **Processing Note:** The higher carbon content of 4142 requires slightly more careful heat treatment and welding procedures than 4140. Consultation with metallurgical experts is recommended for critical applications to optimize processing parameters and ensure optimal performance. **Disclaimer:** Mechanical properties are dependent on exact chemistry, processing history, heat treatment parameters, and section size. The values provided are typical for properly processed material. For critical applications, always consult Latrobe's current technical data sheets and conduct testing under actual service conditions. Proper heat treatment by qualified personnel is essential for achieving the desired properties. -:- For detailed product information, please contact sales. -: Latrobe LSS™ 4142 Alloy Steel (AISI 4142) Specification Dimensions Size： Diameter 20-1000 mm Length <7208 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™ 4142 Alloy Steel (AISI 4142) Properties -:- For detailed product information, please contact sales. -:

Spherical Latrobe LSS™ 4142 Alloy Steel Powder (AISI 4142) Particle Size Description -:- For detailed product information, please contact sales. -: Applications of Spherical Latrobe LSS™ 4142 Alloy Steel Powder (AISI 4142) -:- For detailed product information, please contact sales. -: -:- For detailed product information, please contact sales. -: Applications of Latrobe LSS™ 4142 Alloy Steel Spherical Powder (AISI 4142) -:- For detailed product information, please contact sales. -: Chemical Identifiers Latrobe LSS™ 4142 Alloy Steel Spherical Powder (AISI 4142) -:- For detailed product information, please contact sales. -:

Packing of Latrobe LSS™ 4142 Alloy Steel Spherical Powder (AISI 4142) -:- 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 Spherical Powder 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 3679 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