AISI 4142 Steel Foil/Strip

AISI 4142 Steel Foil, Annealed and Cold Drawn Product Information -:- For detailed product information, please contact sales. -: AISI 4142 Steel Foil, Annealed and Cold Drawn Synonyms -:- For detailed product information, please contact sales. -:

AISI 4142 Steel, Annealed and Cold Drawn Product Information -:- For detailed product information, please contact sales. -: # **AISI 4142 Steel (Annealed and Cold Drawn) Product Specification** ## **1. PRODUCT DEFINITION & PROCESS** **Product:** AISI 4142 Steel Cold Drawn Bar **Condition:** Annealed and Cold Drawn **Manufacturing Process:** 1. **Hot Rolling:** Initial reduction from billet to rough size 2. **Full Annealing:** Complete softening heat treatment 3. **Cold Drawing:** Final reduction through dies at room temperature 4. **Optional Stress Relieving:** May be applied for critical applications **Material State:** This product combines the metallurgical benefits of annealing (softness, uniformity) with the mechanical advantages of cold working (improved strength, dimensional accuracy, surface finish). It is supplied as a "ready-to-machine" material with consistent properties throughout. ## **2. CHEMICAL COMPOSITION** | Element | Composition Range (% by weight) | Metallurgical Role | | :--- | :--- | :--- | | **Carbon (C)** | 0.40 - 0.45 | Higher than 4140, providing increased hardenability and strength potential after final heat treatment. Forms pearlite/ferrite structure in annealed state. | | **Manganese (Mn)** | 0.75 - 1.00 | Enhances hardenability and contributes to solid solution strengthening. Helps maintain ductility during cold drawing. | | **Phosphorus (P)** | ≤ 0.035 | Residual impurity, kept low to preserve cold formability and toughness. | | **Sulfur (S)** | ≤ 0.040 | Residual impurity; may be slightly elevated in free-machining variants. | | **Silicon (Si)** | 0.15 - 0.35 | Deoxidizer; provides solid solution strengthening. | | **Chromium (Cr)** | 0.80 - 1.10 | Increases hardenability and wear resistance potential. | | **Molybdenum (Mo)** | 0.15 - 0.25 | Enhances hardenability, reduces temper embrittlement, improves high-temperature properties. | **Note on Carbon Content:** The 0.40-0.45% carbon range distinguishes 4142 from 4140, providing approximately 10-15% higher hardenability and greater achievable hardness after quenching. ## **3. METALLURGICAL STRUCTURE & PROCESS EFFECTS** **Annealed Microstructure:** Coarse lamellar pearlite in a ferrite matrix (typical Brinell 170-210) **Cold Drawing Effects:** - **Grain Distortion:** Elongation of ferrite grains in drawing direction - **Work Hardening:** Dislocation density increases, raising yield strength - **Texture Development:** Preferred orientation of grains - **Residual Stresses:** Compressive at surface, tensile in core (typical pattern) **Dimensional Characteristics (Cold Drawn Advantage):** - **Tolerance:** ±0.075mm (±0.003") for diameters up to 25mm - **Surface Finish:** 1.6-3.2 μm Ra (63-125 μin) typical - **Straightness:** 0.5mm per meter maximum - **Scale-Free:** Cold drawing produces clean, scale-free surface ideal for machining ## **4. MECHANICAL PROPERTIES (TYPICAL)** *Properties are anisotropic; longitudinal values are higher than transverse.* | Property | Typical Range | Directional Note | | :--- | :--- | :--- | | **Ultimate Tensile Strength** | 620 - 750 MPa (90,000 - 109,000 psi) | Longitudinal | | **Yield Strength (0.2% Offset)** | 415 - 550 MPa (60,000 - 80,000 psi) | 15-25% increase over annealed-only | | **Elongation (in 50mm)** | 18% - 22% | Reduced from annealed (~25%) | | **Reduction of Area** | 50% - 60% | Good ductility retained | | **Hardness** | 190 - 230 HB | Increases with higher cold reduction | | **Machinability Rating** | 65-70% of B1112 | Excellent for an alloy steel | | **Torsional Strength** | ~75% of tensile strength | Good for shaft applications | **Anisotropy Effects:** - **Transverse Ductility:** Typically 60-70% of longitudinal values - **Impact Toughness:** Higher in longitudinal direction - **Fatigue Strength:** Improved surface from cold work compressive stresses ## **5. PHYSICAL PROPERTIES** | Property | Value / Condition | | :--- | :--- | | **Density** | 7.85 g/cm³ (0.284 lb/in³) | | **Modulus of Elasticity** | 200-205 GPa (29,000-29,700 ksi) | | **Shear Modulus** | 80 GPa (11,600 ksi) | | **Poisson's Ratio** | 0.29 | | **Thermal Conductivity** | 42.5 W/m·K @ 100°C | | **Coefficient of Thermal Expansion** | 11.3 µm/m·°C (20-100°C) | | **Electrical Resistivity** | 0.22 µΩ·m @ 20°C | ## **6. PRIMARY APPLICATIONS** This product form is ideal for components requiring precise dimensions, good machinability, and the potential for subsequent heat treatment: * **Automotive Components:** - Transmission shafts and gears (machined then carburized/hardened) - Steering components - Axle shafts * **Machinery & Equipment:** - Hydraulic piston rods - Lead screws and feed rods - Spindles and arbors - Tool holders * **Fastener Industry:** - High-strength bolt blanks - Special studs and pins - Socket head cap screw stock * **Agricultural Equipment:** - PTO shafts - Implement pins and bushings - Gear blanks * **General Manufacturing:** - Die components - Fixture and jig components - Precision shafts and axles ## **7. INTERNATIONAL STANDARDS & EQUIVALENTS** | Standard | Designation | Equivalent Status | Notes | | :--- | :--- | :--- | :--- | | **AISI/SAE** | 4142 | Primary Standard | Higher carbon variant of 4140 | | **ASTM** | A311 Grade 4142 | Cold Drawn Standard | ASTM A311 covers stress-relieved cold-drawn bars | | **UNS** | G41420 | Unified Numbering | | | **DIN/EN** | 42CrMo4 / 1.7225 | Close Equivalent | Same as 4140 equivalent; carbon range overlaps | | **JIS** | SCM440 | Functional Equivalent | Japanese equivalent covers both 4140/4142 ranges | | **GB** | 42CrMo | Chinese Equivalent | GB/T 3077 | | **ISO** | 42CrMo4 | International | ISO 683-18 | ## **8. FABRICATION & PROCESSING GUIDELINES** **Machinability:** - **Rating:** Excellent for an alloy steel (65-70% of 1212) - **Recommended Tools:** High-speed steel or carbide - **Cutting Speeds:** 30-45 m/min (100-150 SFM) for turning - **Feed Rates:** 0.15-0.25 mm/rev (0.006-0.010 in/rev) - **Coolant:** Recommended for extended tool life **Forming & Bending:** - Limited cold formability due to work-hardened state - Minimum bend radius: 2-3 × thickness - Heating to 260-315°C (500-600°F) improves formability **Welding:** - **Possible with precautions** - Preheat: 150-200°C (300-400°F) - Low-hydrogen electrodes required - Post-weld stress relief or full anneal recommended - Not suitable for highly stressed welded structures **Subsequent Heat Treatment:** - **Stress Relieving:** 595-650°C (1100-1200°F) for 1 hr/inch - **Full Annealing:** 815-845°C (1500-1550°F), slow cool - **Hardening:** 830-855°C (1525-1570°F), oil quench - **Tempering:** 425-650°C (800-1200°F) depending on desired strength ## **9. QUALITY ASSURANCE** **Standard Testing:** - Chemical analysis (ladle and check) - Tensile test per ASTM A370 - Hardness testing (Brinell or Rockwell) - Macroscopic examination (etch test for seams) **Surface Quality:** - Free from seams, laps, and rolling defects - Visual inspection per ASTM A484 - Magnetic particle inspection available on request **Dimensional Inspection:** - Diameter verification at multiple points - Straightness check - Roundness verification ## **10. ADVANTAGES & LIMITATIONS** **Key Advantages:** 1. **Dimensional Precision:** Tight tolerances reduce machining allowance 2. **Superior Surface Finish:** Scale-free surface minimizes cleaning operations 3. **Improved Strength:** Cold work provides 15-25% higher yield strength than annealed 4. **Excellent Machinability:** Annealed structure combined with clean surface 5. **Consistent Properties:** Uniform throughout bar length and cross-section 6. **Straightness:** Better than hot-rolled product **Limitations:** 1. **Size Limitations:** Typically available up to 100mm diameter 2. **Anisotropic Properties:** Directional mechanical properties 3. **Residual Stresses:** May cause distortion if asymmetrically machined 4. **Cost Premium:** 20-40% higher than hot-rolled equivalent ## **11. PACKAGING & HANDLING** **Standard Packaging:** - Bundles of 500-2000 kg, plastic wrapped for protection - Individual bars: 3-6 meter lengths standard - End protection with plastic caps - Identification tags on each bundle **Storage Recommendations:** - Store in dry conditions to prevent rust - Keep off damp floors - Indoor storage preferred **Marking:** - Grade stamped on bar ends (4142) - Heat number identification - Mill identification - Size marking --- **Note:** This material is specifically engineered as premium machining stock for components that will be heat treated after machining. The cold drawn condition provides the dimensional accuracy needed for precision parts while the annealed microstructure ensures consistent machinability and predictable response to final heat treatment. -:- For detailed product information, please contact sales. -: AISI 4142 Steel, Annealed and Cold Drawn Specification Dimensions Size： Diameter 20-1000 mm Length <6213 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. -: AISI 4142 Steel, Annealed and Cold Drawn Properties -:- For detailed product information, please contact sales. -:

Applications of AISI 4142 Steel Foil, Annealed and Cold Drawn -:- For detailed product information, please contact sales. -: Chemical Identifiers AISI 4142 Steel Foil, Annealed and Cold Drawn -:- For detailed product information, please contact sales. -:

Packing of AISI 4142 Steel Foil/Strip, Annealed and Cold Drawn -:- 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 Foil/Strip 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 2684 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