Latrobe,LSS™ 4140 Alloy Steel Flange (AISI 4140)

1,We Manufacturing processes are primarily classified into four types: 1:Forging, 2:Casting, 3:Cutting, 4:Rolling. 2,We can manufacture in accordance with these standards. Standards: GB Series (Chinese Standards), JB Series (Machinery Standards), HG Series (Chemical Industry Standards), ASME B16.5 (American Standards), BS4504 (British Standards), DIN (German Standards), and JIS (Japanese Standards). Internationally, there are two primary systems of pipe flange standards: the European system, represented by the German DIN standards (including those of the former Soviet Union), and the American system, represented by the US ANSI pipe flange standards. Other common standards include: the Chinese Ministry of Machinery Industry standards (JB series), the Ministry of Chemical Industry standards (HG series), the Chinese National Standard *GB/T 9112–9124-2010 Steel Pipe Flanges*, as well as US standards (ASME B16.5), British standards (BS4504), German standards (DIN), Japanese standards (JIS), and marine standards (CBM), among others. The nominal pressure ratings for the PN series are designated by "PN" and comprise the following nine levels: PN2.5, PN6, PN10, PN16, PN25, PN40, PN63, PN100, and PN160. The nominal pressure ratings for the Class series are designated by "Class" and comprise the following six levels: Class150, Class300, Class600, Class900, Class1500, and Class2500. Flange Classification 1. **According to Chemical Industry Standards:** Flanges are classified as follows: Plate Flat Welding Flange (PL), Necked Flat Welding Flange (SO), Necked Butt Welding Flange (WN), Integral Flange (IF), Socket Welding Flange (SW), Threaded Flange (Th), Butt Welding Ring Loose Flange (PJ/SE), Blind Flange (BL), Flat Welding Ring Loose Flange (PJ/PJ), and Lined Blind Flange (BL(s)). 2. **According to Petrochemical (SH) Industry Standards:** Flanges are classified as follows: Threaded Flange (PL), Butt Welding Flange (WN), Flat Welding Flange (SO), Socket Welding Flange (SW), Loose Flange (LJ), and Blind Flange (no specific designation). 3. **According to Machinery (JB) Industry Standards:** Flanges are classified as follows: Integral Flange, Butt Welding Flange, Plate Flat Welding Flange, Butt Welding Ring Plate Loose Flange, Flat Welding Ring Plate Loose Flange, Lap Joint Ring Plate Loose Flange, and Blind Flange. 4. **According to Connection Method/Type:** Flanges are classified as follows: Plate Flat Welding Flange, Necked Flat Welding Flange, Necked Butt Welding Flange, Socket Welding Flange, Threaded Flange, Blind Flange, Necked Butt Welding Ring Loose Flange, Flat Welding Ring Loose Flange, Ring-Type Joint (RTJ) Flange and Blind Flange, Large-Diameter Plate Flange, Large-Diameter High-Neck Flange, Figure-8 Blind Plate, Butt Welding Ring Loose Flange, etc. 5. **According to the Component Being Connected:** Flanges can be classified into Vessel Flanges and Pipe Flanges. 6. **According to Structural Type:** Flanges include Integral Flanges, Threaded Flanges, Flat Welding Flanges, Butt Welding Flanges, Lap Joint (Loose/Swivel) Flanges, and Blind Flanges. A flange—also referred to as a flange plate or rim—is a component used to connect shafts to one another, or, more commonly, to join the ends of pipes. Flanges are also utilized at the inlet and outlet ports of equipment to facilitate connections between two devices—for instance, the flange on a speed reducer. A "flange connection" or "flanged joint" refers to a detachable joint assembly comprising three interconnected elements—a flange, a gasket, and bolts—that together form a sealed structural unit. In the context of piping systems, a "pipe flange" specifically denotes a flange used for plumbing within the installation; when applied to equipment, it refers to the inlet or outlet flange of that specific device. Flanges feature a series of holes through which bolts are inserted to securely fasten the two flanges together, while a gasket placed between the flanges ensures a leak-proof seal. Flanges are broadly categorized into three types: threaded (screw-in) flanges, welded flanges, and clamp-type flanges. Flanges are invariably used in pairs; threaded flanges are suitable for low-pressure piping applications, whereas welded flanges are required for systems operating at pressures exceeding 4 kilograms per square centimeter. A sealing gasket is inserted between the two flange plates, which are then firmly secured using bolts. The thickness of a flange—as well as the specifications of the bolts used to fasten it—vary depending on the specific pressure rating required for the application. When connecting equipment such as water pumps or valves to piping systems, the corresponding connection points on these devices are often manufactured in the shape of a matching flange; this method of attachment is also referred to as a "flange connection." Generally, any connecting component that utilizes bolts to join and seal the perimeters of two flat surfaces—such as the joints in ventilation ducts—is termed a "flange"; such components may collectively be classified as "flange-type parts." However, since such a connection often constitutes merely a *portion* of a larger device—for instance, the interface between a flange and a water pump—it would be inappropriate to classify the entire water pump itself as a "flange-type part." Conversely, smaller components—such as valves—that feature such flanged interfaces may indeed be appropriately categorized as "flange-type parts." -:- For detailed product information, please contact sales. -: Latrobe LSS™ 4140 Alloy Steel Flange (AISI 4140) Product Information -:- For detailed product information, please contact sales. -: Latrobe LSS™ 4140 Alloy Steel Flange (AISI 4140) Synonyms -:- For detailed product information, please contact sales. -:

Latrobe LSS™ 4140 Alloy Steel (AISI 4140) Product Information -:- For detailed product information, please contact sales. -: # **PRODUCT DATASHEET: LATROBE LSS™ 4140 ALLOY STEEL (AISI 4140)** ## **EXECUTIVE SUMMARY** Latrobe LSS™ **4140 Alloy Steel** is a premier-grade **chromium-molybdenum medium-carbon alloy steel** renowned for its **exceptional combination of high strength, good toughness, and excellent wear resistance**. As one of the most versatile and widely used alloy steels globally, 4140 offers an optimal balance of **mechanical properties, machinability, and heat treatment response** that makes it suitable for an extensive range of industrial applications. Latrobe's proprietary manufacturing processes enhance the inherent advantages of standard 4140, delivering **superior cleanliness, consistent through-hardening characteristics, and reliable performance** in both normalized/tempered and quenched/tempered conditions. This versatile engineering steel is characterized by its **deep hardenability, good fatigue strength, and favorable strength-to-weight ratio**, making it the material of choice for **shafts, gears, bolts, hydraulic components, and structural applications** across numerous industries. With Latrobe's quality enhancements, LSS™ 4140 provides predictable performance, reduced scatter in mechanical properties, and improved processing characteristics compared to conventional 4140 materials. --- ## **METALLURGICAL DESIGN** ### **Material Philosophy** 4140 belongs to the chromium-molybdenum family of alloy steels, engineered to achieve: 1. **Balanced Strength-Toughness Ratio:** Medium carbon content (0.38-0.43%) provides excellent strength while maintaining good ductility and impact resistance 2. **Deep Hardenability:** Chromium (0.80-1.10%) and molybdenum (0.15-0.25%) synergistically enhance through-hardening capability 3. **Temper Resistance:** Molybdenum addition provides good resistance to softening at elevated temperatures 4. **Fatigue Performance:** Fine grain structure and clean steelmaking practices contribute to superior fatigue resistance ### **Latrobe Manufacturing Advantages** - **Controlled Melting Practices:** Electric arc furnace with ladle refining for optimal cleanliness - **Precision Alloy Control:** Tight chemistry ranges for consistent hardenability - **Thermomechanical Processing:** Controlled rolling for optimized grain structure - **Quality Verification:** Comprehensive testing at multiple processing stages - **Heat Treatment Expertise:** Knowledge and support for optimal processing ### **Microstructural Excellence** - **Fine Grain Structure:** Typically ASTM 7-9 for optimal toughness - **Uniform Microstructure:** Consistent phase distribution for predictable performance - **Controlled Inclusion Content:** Enhanced steel cleanliness for improved fatigue life - **Optimized Carbide Distribution:** Favorable carbide morphology for balanced properties --- ## **CHEMICAL COMPOSITION** ### **Standard Composition Ranges (Weight %)** | Element | Minimum | Maximum | Typical | Metallurgical Function | |---------|---------|---------|---------|------------------------| | **Carbon (C)** | 0.38 | 0.43 | 0.40 | Strength, hardness, hardenability base | | **Manganese (Mn)** | 0.75 | 1.00 | 0.85 | Hardenability, strength, deoxidation | | **Phosphorus (P)** | — | 0.035 | 0.015 | Residual (controlled for toughness) | | **Sulfur (S)** | — | 0.040 | 0.020 | Machinability enhancement | | **Silicon (Si)** | 0.15 | 0.35 | 0.25 | Deoxidation, strength, hardenability | | **Chromium (Cr)** | 0.80 | 1.10 | 0.95 | Hardenability, wear resistance, corrosion resistance | | **Molybdenum (Mo)** | 0.15 | 0.25 | 0.20 | Hardenability, temper resistance, toughness | | **Nickel (Ni)** | — | 0.25 | 0.15 | Optional, enhances toughness | ### **Latrobe Premium Modifications** - **Enhanced Purity:** Lower sulfur and phosphorus (S<0.015%, P<0.020%) for improved transverse properties - **Optional Leaded Version:** 0.15-0.35% lead for improved machinability (4140 Leaded) - **Boron-Treated:** Optional boron addition (0.0005-0.003%) for enhanced hardenability - **Gas Control:** Oxygen <30 ppm, Hydrogen <2 ppm through improved melting practices ### **Special Variants** - **4140 Mod:** Modified chemistry for specific hardenability requirements - **4140 HT:** Optimized for high-temperature applications - **4140ESR:** Electroslag remelted for superior cleanliness - **4140+V:** Vanadium microalloyed for grain refinement --- ## **PHYSICAL PROPERTIES** ### **Basic Physical Constants** | Property | Value | Units | Test Standard | |----------|-------|--------|----------------| | **Density** | 0.284 | lb/in³ (7.85 g/cm³) | ASTM B311 | | **Melting Point** | 2600-2700 | °F (1425-1480°C) | | | **Modulus of Elasticity** | 29.0 × 10⁶ | psi (200 GPa) | ASTM E111 | | **Shear Modulus** | 11.2 × 10⁶ | psi (77 GPa) | ASTM E143 | | **Poisson's Ratio** | 0.29 | | ASTM E132 | | **Thermal Conductivity** | 21.5 | BTU·in/(hr·ft²·°F) @ 212°F | ASTM E1225 | | **Specific Heat** | 0.11 | BTU/(lb·°F) @ 68-212°F | ASTM E1269 | | **Coefficient of Thermal Expansion** | 6.3 × 10⁻⁶ | /°F (20-200°C) | ASTM E228 | | **Electrical Resistivity** | 42 | μΩ·cm | ASTM B193 | | **Magnetic Permeability** | Ferromagnetic | | | ### **Thermal Properties by Temperature** | Temperature | Thermal Conductivity | Specific Heat | CTE | |-------------|----------------------|---------------|-----| | **68°F (20°C)** | 21.0 BTU·in/(hr·ft²·°F) | 0.11 BTU/(lb·°F) | 6.3 × 10⁻⁶ /°F | | **212°F (100°C)** | 21.5 BTU·in/(hr·ft²·°F) | 0.12 BTU/(lb·°F) | 6.5 × 10⁻⁶ /°F | | **392°F (200°C)** | 22.0 BTU·in/(hr·ft²·°F) | 0.13 BTU/(lb·°F) | 6.8 × 10⁻⁶ /°F | | **572°F (300°C)** | 22.5 BTU·in/(hr·ft²·°F) | 0.14 BTU/(lb·°F) | 7.0 × 10⁻⁶ /°F | --- ## **MECHANICAL PROPERTIES** ### **Typical Properties in Various Conditions** #### **Normalized and Tempered (1800°F normalize, 1200°F temper)** | Property | Value | Units | |----------|-------|--------| | **Tensile Strength** | 95-110 | ksi (655-760 MPa) | | **Yield Strength (0.2%)** | 60-75 | ksi (415-515 MPa) | | **Elongation (2")** | 18-22 | % | | **Reduction of Area** | 45-55 | % | | **Hardness** | 197-235 | HB (93-99 HRB) | | **Charpy V-Notch Impact** | 40-60 | ft-lb @ 68°F | #### **Annealed Condition (Full Anneal)** | Property | Value | Units | |----------|-------|--------| | **Hardness** | 156-207 | HB (85-93 HRB) | | **Tensile Strength** | 75-90 | ksi (515-620 MPa) | | **Yield Strength** | 45-60 | ksi (310-415 MPa) | | **Machinability Rating** | 65-70 | % of 1212 steel | #### **As-Rolled or As-Forged** | Property | Value | Units | |----------|-------|--------| | **Hardness** | 217-269 | HB (95-25 HRC) | | **Tensile Strength** | 105-125 | ksi (725-860 MPa) | ### **Quenched and Tempered Properties** #### **Oil Quenched from 1550°F (843°C)** | Tempering Temperature | Hardness | Tensile Strength | Yield Strength | Impact Energy | |----------------------|----------|------------------|----------------|---------------| | **400°F (204°C)** | 50-54 HRC | 240-260 ksi | 200-220 ksi | 15-25 ft-lb | | **600°F (316°C)** | 45-49 HRC | 210-230 ksi | 180-200 ksi | 20-30 ft-lb | | **800°F (427°C)** | 38-42 HRC | 175-195 ksi | 155-175 ksi | 30-40 ft-lb | | **1000°F (538°C)** | 30-34 HRC | 140-160 ksi | 125-145 ksi | 40-55 ft-lb | | **1200°F (649°C)** | 25-28 HRC | 115-135 ksi | 100-120 ksi | 50-70 ft-lb | ### **Hardenability Data (Jominy End-Quench Test)** | Distance from Quenched End | Hardness (HRC) | |----------------------------|----------------| | **1/16" (1.6 mm)** | 55-60 | | **1/8" (3.2 mm)** | 54-59 | | **1/4" (6.4 mm)** | 52-57 | | **1/2" (12.7 mm)** | 48-53 | | **1" (25.4 mm)** | 40-45 | | **2" (50.8 mm)** | 32-37 | **Note:** Through-hardenable to approximately 2.5 inches (63.5 mm) diameter in oil quench ### **Fatigue Properties** | Condition | Endurance Limit (10⁷ cycles) | Fatigue Ratio | |-----------|----------------------------|---------------| | **Normalized** | 50-55 ksi | 0.50-0.55 | | **Q&T @ 1200°F** | 65-70 ksi | 0.50-0.55 | | **Q&T @ 1000°F** | 75-80 ksi | 0.50-0.55 | | **Q&T @ 800°F** | 90-95 ksi | 0.50-0.55 | | **Q&T @ 400°F** | 110-120 ksi | 0.45-0.50 | ### **Cryogenic and Elevated Temperature Properties** #### **Low Temperature Impact Strength** | Temperature | Charpy V-Notch Impact | |-------------|-----------------------| | **+68°F (+20°C)** | 40-60 ft-lb | | **+32°F (0°C)** | 35-55 ft-lb | | **-40°F (-40°C)** | 25-45 ft-lb | | **-100°F (-73°C)** | 15-35 ft-lb | #### **Elevated Temperature Strength** | Temperature | Yield Strength Retention | |-------------|--------------------------| | **Room Temperature** | 100% | | **400°F (204°C)** | 90-95% | | **600°F (316°C)** | 80-85% | | **800°F (427°C)** | 65-70% | | **1000°F (538°C)** | 45-50% | --- ## **MACHINABILITY** ### **Machining Characteristics** #### **Annealed Condition (~190 HB)** - **Machinability Rating:** 65-70% of 1212 steel - **Tool Life Expectancy:** Good to excellent with proper tooling - **Chip Formation:** Produces discontinuous chips - **Surface Finish:** Good with proper technique #### **Recommended Cutting Parameters** | Operation | Speed (SFM) | Feed | Depth of Cut | Tool Material | |-----------|-------------|------|--------------|---------------| | **Turning** | 200-250 | 0.010-0.020 IPR | 0.100-0.250" | C2/C3 Carbide | | **Milling** | 150-200 | 0.004-0.008 IPT | 0.100-0.200" | HSS or Carbide | | **Drilling** | 80-120 | 0.006-0.010 IPR | Full diameter | HSS Drills | | **Tapping** | 40-60 | — | — | HSS Taps | | **Sawing** | 100-150 FPM | Moderate | — | Bimetal Blades | ### **Grindability** - **Relative Grindability:** Good (80% of W1 water-hardening steel) - **Recommended Wheels:** Aluminum oxide (32A-46H-V) - **Coolant:** Water-soluble grinding fluid recommended - **Burning Sensitivity:** Moderate - proper technique required ### **Non-Traditional Machining** - **EDM:** Excellent performance, good material removal rates - **Laser Cutting:** Good with proper parameters - **Waterjet:** Excellent, no heat-affected zone - **Plasma Cutting:** Good for thicker sections --- ## **HEAT TREATMENT** ### **Annealing** - **Full Anneal:** 1550-1600°F (843-871°C), slow furnace cool - **Process Anneal:** 1200-1300°F (649-704°C), air cool - **Spheroidize Anneal:** 1300-1350°F (704-732°C), slow cool or cycle - **Resultant Hardness:** 156-207 HB ### **Normalizing** - **Temperature:** 1600-1700°F (871-927°C) - **Time:** 1 hour per inch of thickness - **Cooling:** Air cool - **Purpose:** Refine grain structure, homogenize ### **Hardening** 1. **Preheat:** 1200-1250°F (649-677°C) 2. **Austenitize:** 1525-1575°F (829-857°C) 3. **Soak Time:** 20-30 minutes per inch at temperature 4. **Quench Medium:** Oil (preferred) or water for thin sections 5. **Quench Temperature:** Cool to 150°F (66°C) or below 6. **Immediate Tempering:** Required to prevent cracking ### **Tempering** - **Temperature Range:** 300-1200°F (149-649°C) - **Time:** 1-2 hours per inch, minimum 1 hour - **Double Tempering:** Recommended for maximum toughness - **Cooling:** Air cool after tempering ### **Surface Hardening** - **Carburizing:** 1700-1750°F (927-954°C) for case hardening - **Induction Hardening:** Excellent response, case depths 0.030-0.250" - **Flame Hardening:** Suitable for large components - **Nitriding:** 975-1050°F (524-566°C) for wear resistance ### **Heat Treatment Response Chart** | Condition | Hardness | Typical Applications | |-----------|----------|---------------------| | **Annealed** | 156-207 HB | Machining, forming | | **Normalized** | 197-235 HB | General purpose | | **Q&T @ 1200°F** | 25-28 HRC | High toughness | | **Q&T @ 1000°F** | 30-34 HRC | General engineering | | **Q&T @ 800°F** | 38-42 HRC | High strength | | **Q&T @ 400°F** | 50-54 HRC | Maximum hardness | --- ## **INTERNATIONAL STANDARDS & SPECIFICATIONS** ### **Primary Material Standards** | Standard | Designation | Equivalent/Synonymous Grades | |----------|-------------|-----------------------------| | **ASTM A29/A29M** | 4140 | Primary US Standard | | **AISI/SAE** | 4140 | American Iron and Steel Institute | | **UNS** | G41400 | Unified Numbering System | | **AMS** | 6382, 6395 | Aerospace Material Specification | | **MIL-S** | MIL-S-6049 | Military Specification | | **DIN** | 1.7225 | 42CrMo4 | | **EN** | 1.7225 | 42CrMo4 | | **ISO** | 42CrMo4 | International Standard | | **JIS** | SCM440 | Japanese Industrial Standard | | **GB** | 42CrMo | Chinese Standard | ### **Industry-Specific Specifications** - **Automotive:** SAE J404, J412, J770 - **Aerospace:** AMS 6382 (bars), AMS 6395 (forgings) - **Oil & Gas:** API 6A, 16A, 17D - **Firearms:** SAE-AMS-6382 (gun barrel quality) ### **Heat Treatment Standards** - **ASTM A255:** Standard Test Method for End-Quench Test - **ASTM A304:** Standard Specification for Alloy Steel Bars - **ISO 683-1:** Heat-treatable steels, alloy steels and free-cutting steels ### **Testing Standards** - **ASTM A370:** Standard Test Methods for Mechanical Testing - **ASTM E112:** Standard Test Methods for Grain Size - **ASTM E45:** Standard Test Methods for Inclusion Content - **ASTM E384:** Standard Test Method for Microindentation Hardness --- ## **APPLICATIONS** ### **Aerospace & Defense** - **Aircraft Components:** Landing gear parts, engine mounts, structural fittings - **Missile Systems:** Guidance components, rocket motor cases - **Firearms:** Receivers, barrels, bolts (military specifications) - **Armor Components:** Light armor applications ### **Automotive Industry** - **Drive Train:** Axles, shafts, differential gears, drive shafts - **Engine Components:** Crankshafts, connecting rods, camshafts - **Suspension:** Steering knuckles, torsion bars, suspension arms - **Fasteners:** High-strength bolts, studs, wheel bolts ### **Oil & Gas** - **Drilling Equipment:** Drill collars, tool joints, subs - **Wellhead Components:** Valve bodies, stems, flanges - **Downhole Tools:** Mud motor components, fishing tools - **Pipeline:** High-pressure fittings, valves ### **Industrial Machinery** - **Gears & Sprockets:** High-strength gears, sprockets, pinions - **Shafting:** Line shafts, counter shafts, spindle shafts - **Hydraulic Components:** Cylinder barrels, piston rods, pump parts - **Tooling:** Jigs, fixtures, die components ### **Construction & Mining** - **Earthmoving Equipment:** Bucket teeth, cutting edges, track links - **Crane Components:** Shafts, gears, sheaves - **Mining Tools:** Drill bits, cutter heads, conveyor parts ### **Other Applications** - **Medical Equipment:** Surgical instrument components - **Agricultural Machinery:** Tractor components, implement parts - **Power Transmission:** Couplings, universal joints, yokes - **Plastic Injection Molds:** Core pins, ejector pins, mold bases ### **Application-Specific Recommendations** | Application | Recommended Condition | Hardness | Key Requirements | |-------------|-----------------------|----------|------------------| | **General Shafting** | Q&T @ 1000-1200°F | 28-34 HRC | Toughness, fatigue strength | | **Gears** | Q&T @ 800-1000°F | 34-42 HRC | Wear resistance, pitting resistance | | **Bolts/Fasteners** | Q&T @ 800-1000°F | 34-40 HRC | Strength, fatigue | | **Hydraulic Cylinders** | Q&T @ 800-1000°F | 34-40 HRC | Wear, corrosion resistance | | **Tooling Components** | Q&T @ 400-600°F | 45-52 HRC | Maximum hardness | --- ## **WELDING & JOINING** ### **Weldability Characteristics** - **Carbon Equivalent (CE):** Approximately 0.70-0.80 - **Weldability Rating:** Fair to good with proper procedures - **Preheat Requirement:** Recommended for thickness >0.5" - **Post-Weld Heat Treatment:** Usually required ### **Recommended Welding Processes** 1. **Shielded Metal Arc (SMAW):** Most common, versatile 2. **Gas Metal Arc (GMAW):** For higher deposition rates 3. **Gas Tungsten Arc (GTAW):** For precision and root passes 4. **Flux-Cored Arc (FCAW):** For outdoor and heavy fabrication 5. **Submerged Arc (SAW):** For high-deposition applications ### **Filler Metal Selection** - **Matching Strength:** E11018, ER110S-G, E10018-D2 - **High Toughness:** Nickel-base fillers for critical applications - **Stainless Steel:** For corrosion resistance overlay - **Hardfacing:** For wear-resistant surfaces ### **Welding Procedures** - **Preheat Temperature:** 300-500°F (149-260°C) - **Interpass Temperature:** 300-600°F (149-316°C) - **Post-Weld Heat Treatment:** Stress relieve at 1100-1250°F (593-677°C) - **Peening:** Optional for stress relief during welding ### **Special Considerations** - **Hydrogen Control:** Use low-hydrogen processes and consumables - **Restraint:** Minimize joint restraint to reduce cracking tendency - **Heat Input:** Control to avoid excessive HAZ softening - **Inspection:** NDT recommended for critical welds --- ## **CORROSION BEHAVIOR & PROTECTION** ### **Corrosion Resistance** - **General Corrosion:** Similar to plain carbon steel (poor without protection) - **Atmospheric Corrosion:** Requires protective coatings - **Galvanic Corrosion:** Can occur when coupled with more noble metals - **Stress Corrosion Cracking:** Possible in certain environments ### **Protective Treatments** - **Plating:** Zinc, cadmium, nickel, chrome - **Painting:** Proper surface preparation essential - **Phosphating:** For paint adhesion and mild corrosion resistance - **Black Oxide:** For appearance and mild protection - **Hot Dip Galvanizing:** Excellent corrosion protection ### **Environmental Considerations** - **Marine Environments:** Requires heavy protection - **Industrial Atmospheres:** Moderate protection needed - **Indoor Applications:** Minimal protection usually sufficient - **Chemical Exposure:** Dependent on specific chemicals --- ## **QUALITY ASSURANCE** ### **Standard Testing** - **Chemical Analysis:** Spectroscopic verification - **Hardness Testing:** Brinell, Rockwell, or Vickers as specified - **Tensile Testing:** Per ASTM A370 - **Impact Testing:** Charpy V-notch if required - **Macroetch Testing:** For internal quality ### **Premium Quality Features** - **Ultrasonic Testing:** For internal soundness - **Magnetic Particle Inspection:** For surface defects - **Dye Penetrant Inspection:** For surface quality - **Grain Size Verification:** ASTM E112 - **Inclusion Rating:** ASTM E45 ### **Certification Levels** - **Mill Test Report:** Standard chemistry and hardness - **Certified MTR:** Includes mechanical test results - **Third Party Certification:** Independent verification available - **Traceability:** Complete heat-to-product tracking --- ## **AVAILABILITY & ORDERING** ### **Standard Forms & Sizes** - **Round Bars:** 1/4" to 24" diameter - **Square Bars:** 1/4" to 12" square - **Flat Bars:** Up to 12" thick × 48" wide - **Hexagonal Bars:** Standard sizes - **Billets & Blooms:** For forging - **Forgings:** Custom shapes and sizes ### **Standard Conditions** - **Hot Rolled:** As-rolled, annealed, or normalized - **Cold Finished:** Turned, ground, polished - **Heat Treated:** Quenched and tempered to specification - **Stress Relieved:** For machining stability ### **Special Processing** - **Rough Machining:** To customer prints - **Heat Treatment:** Custom cycles available - **Testing & Inspection:** To customer requirements - **Certification:** Various levels available ### **Lead Time Guidelines** - **Stock Items:** 1-2 weeks - **Production Items:** 4-8 weeks - **Special Processing:** Additional 2-4 weeks - **Export Orders:** Additional documentation time --- ## **TECHNICAL SUPPORT** Latrobe provides comprehensive technical support for 4140 applications: ### **Engineering Support** - Material selection and substitution - Heat treatment recommendations - Machining parameter optimization - Welding procedure development ### **Problem Solving** - Failure analysis and investigation - Processing trouble-shooting - Quality issue resolution - Application optimization ### **Training & Education** - Material characteristics seminars - Heat treatment best practices - Machining optimization workshops - Welding procedure training ### **Contact Information** **Latrobe Specialty Metals Technical Services** Phone: +1 (724) 537-7711 Email: technicalservices@latrobemetals.com Website: www.latrobemetals.com --- ## **ENVIRONMENTAL & SAFETY** ### **Material Safety** - **MSDS Available:** Upon request - **Handling:** Standard steel handling procedures - **Machining:** Use appropriate coolant and ventilation - **Heat Treatment:** Follow standard furnace safety ### **Environmental Impact** - **Recyclability:** 100% recyclable - **Disposal:** Scrap steel can be recycled - **Coolant Management:** Proper disposal required - **Energy Efficiency:** Optimized processing for minimal energy use ### **Regulatory Compliance** - **RoHS Compliant:** Yes - **REACH Registered:** Yes - **Conflict Minerals:** Compliant with regulations --- ## **COMPARATIVE ADVANTAGES** ### **vs. Similar Alloy Steels** | Property | 4140 | 4340 | 4150 | 8640 | |----------|------|------|------|------| | **Carbon Content** | 0.40% | 0.40% | 0.50% | 0.40% | | **Primary Alloy** | Cr-Mo | Ni-Cr-Mo | Cr-Mo | Ni-Cr-Mo | | **Hardenability** | Very Good | Excellent | Very Good | Good | | **Toughness** | Very Good | Excellent | Good | Very Good | | **Cost** | Moderate | High | Moderate | Moderate | | **Applications** | General | Critical | High Wear | Automotive | ### **Latrobe LSS™ 4140 Advantages** - **Consistent Quality:** Tight control from melt to finished product - **Superior Cleanliness:** Enhanced steelmaking practices - **Technical Expertise:** Comprehensive application support - **Reliable Supply:** Consistent availability and delivery - **Proven Performance:** Industry-recognized reliability ### **Selection Guidelines** - **Choose 4140 When:** Balanced properties, cost-effectiveness, and availability are priorities - **Consider Alternatives When:** Higher toughness (4340), higher wear (4150), or special requirements are needed --- ## **DISCLAIMER** ### **Important Notices** 1. **Technical Data:** Information provided represents typical values. Actual properties may vary based on processing, heat treatment, and section size. 2. **Application Suitability:** Users should evaluate material suitability for specific applications and conditions. 3. **Heat Treatment:** Properties are highly dependent on proper heat treatment. Validate cycles for specific applications. 4. **Safety:** Follow all appropriate safety procedures when handling, machining, and heat treating this material. ### **Warranty Information** Latrobe Specialty Metals warrants that material supplied will meet agreed specifications. Final performance depends on proper processing by the customer. Consultation with technical staff is recommended for critical applications. ### **Revision Information** **Document Number:** LSS-4140-DS-2024-01 **Effective Date:** January 2024 **Next Review:** January 2025 --- *© 2024 Latrobe Specialty Metals. All rights reserved.* *LSS™ is a trademark of Latrobe Specialty Metals.* *AISI 4140 is a standard designation of SAE International.* -:- For detailed product information, please contact sales. -: Latrobe LSS™ 4140 Alloy Steel (AISI 4140) Specification Dimensions Size： Diameter 20-1000 mm Length <6471 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™ 4140 Alloy Steel (AISI 4140) Properties -:- For detailed product information, please contact sales. -:

Applications of Latrobe LSS™ 4140 Alloy Steel Flange (AISI 4140) -:- For detailed product information, please contact sales. -: Chemical Identifiers Latrobe LSS™ 4140 Alloy Steel Flange (AISI 4140) -:- For detailed product information, please contact sales. -:

Packing of Latrobe LSS™ 4140 Alloy Steel Flange (AISI 4140) -:- 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 Flange 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 2942 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