Niagara LaSalle 4140 Cold Finished Steel Foil/Strip

Niagara LaSalle 4140 Cold Finished Steel Foil Bar Product Information -:- For detailed product information, please contact sales. -: Niagara LaSalle 4140 Cold Finished Steel Foil Bar Synonyms -:- For detailed product information, please contact sales. -:

Niagara LaSalle 4140 Cold Finished Steel Bar Product Information -:- For detailed product information, please contact sales. -: # **Product Introduction: Niagara LaSalle 4140 Cold Finished Steel Bar** **Niagara LaSalle 4140** is a premium-grade **cold finished, chromium-molybdenum alloy steel bar** widely regarded as one of the most versatile and widely used engineering steels in the world. Produced under Niagara LaSalle's stringent quality controls, this material offers an exceptional balance of high strength, excellent toughness, good fatigue resistance, and moderate wear resistance. The cold drawing process enhances its surface finish, dimensional accuracy, and provides improved "as-supplied" mechanical properties, making it suitable for demanding applications both in its annealed or pre-hardened condition, and as an optimal substrate for further heat treatment. AISI/SAE 4140 is a through-hardening alloy steel valued for its deep hardenability, which allows it to develop high strength throughout substantial cross-sections. Its combination of chromium (for hardenability and wear resistance) and molybdenum (for toughness and high-temperature strength) makes it indispensable across virtually every heavy industry, from aerospace and automotive to oilfield and tooling. --- ## **1. Chemical Composition (Per AISI/SAE 4140)** The composition is carefully balanced to achieve a superior blend of hardenability, strength, and toughness. | Element | Carbon (C) | Manganese (Mn) | Silicon (Si) | Chromium (Cr) | Molybdenum (Mo) | | :--- | :--- | :--- | :--- | :--- | :--- | | **Content** | 0.38 - 0.43 | 0.75 - 1.00 | 0.15 - 0.35 | 0.80 - 1.10 | 0.15 - 0.25 | | **Key Role** | Provides core strength and hardness potential. | Enhances hardenability and strength. | Deoxidizer and strengthens ferrite. | **Primary hardenability element;** improves wear and corrosion resistance. | **Enhances hardenability depth, toughness,** and resistance to temper embrittlement. | **Key Characteristics of the Composition:** * **Medium Carbon with Alloy Synergy:** The 0.40% carbon base provides a strong, hardenable matrix. The synergistic effect of **Chromium and Molybdenum** ensures deep and uniform hardening during oil quenching, allowing large-diameter bars to achieve high strength throughout. * **Superior Hardenability:** The alloy package provides significantly greater hardenability than plain carbon steels (e.g., 1045), enabling it to achieve high strength in sections over several inches thick. * **Excellent Toughness:** Molybdenum is particularly effective in promoting a fine-grained microstructure and increasing toughness at a given hardness level, a critical property for impact-resistant components. --- ## **2. Physical & Mechanical Properties** Properties vary significantly based on the supplied condition (annealed, cold drawn, or pre-hardened) and any subsequent heat treatment. ### **A. Supplied Conditions:** **Annealed or Cold Drawn (Typical for Machining):** * **Hardness:** 197 - 223 HB (Approx. 92-97 HRB / HRC 13-19) * **Tensile Strength:** 95,000 psi (655 MPa) * **Yield Strength:** 60,000 psi (414 MPa) * **Machinability:** ~65% of B1112. Fair machinability in the annealed state; requires robust tooling and correct speeds/feeds. **Pre-Hardened (e.g., 28-32 HRC):** * **Hardness:** 28 - 32 HRC * **Tensile Strength:** 125,000 - 145,000 psi (862 - 1000 MPa) * **Yield Strength:** 105,000 - 125,000 psi (724 - 862 MPa) * **Machinability:** More challenging, requiring carbide tooling and careful parameters. ### **B. After Quenching & Tempering (Typical Ranges):** * **Tensile Strength:** 150,000 - 240,000+ psi (1034 - 1655+ MPa) * **Yield Strength:** 135,000 - 200,000+ psi (931 - 1379+ MPa) * **Hardness Range:** **HRC 28 - 55** (Widely adjustable via tempering temperature). * **Excellent Impact Toughness** at medium hardness levels (e.g., HRC 28-38). * **Good Fatigue Strength** and wear resistance. ### **C. Cold Drawn Physical Attributes:** * **Surface Finish:** 32 - 63 µin Ra (0.8 - 1.6 µm) * **Dimensional Tolerance:** Meets **ASTM A108** or tighter precision tolerances. * **Straightness:** Excellent. --- ## **3. Product Applications** Niagara LaSalle 4140 is a fundamental engineering material for high-stress, critical components across all major industries. * **Aerospace:** **Landing gear components, engine mounts, and critical fasteners.** * **Automotive & Racing:** **Crankshafts, axle shafts, connecting rods, suspension components, and gears.** * **Oil & Gas:** **Drilling tool joints, shafts, valve bodies, and high-pressure fittings.** * **Tooling & Machinery:** **Molds, dies, machine tool spindles, arbors, and heavy-duty bolts.** * **General High-Strength Components:** **Pins, shafts, rollers, couplings,** and any part requiring a superior strength-to-toughness ratio. --- ## **4. International & Equivalent Standards** AISI 4140 is a globally recognized grade with direct equivalents in all major standards systems. | Standard System | Equivalent Grade | **Notes** | | :--- | :--- | :--- | | **AISI / SAE** | **4140** | The direct U.S. standard. | | **ASTM** | **A108** (Cold Finished), **A829** (Plate) | Common procurement specifications. | | **UNS** | G41400 | Unified Numbering System. | | **DIN (EN)** | **1.7225 (42CrMo4)** | The direct European equivalent. The most common designation. | | **ISO** | ISO 683-18: Type 1.7225 | International standard equivalent. | | **JIS** | **SCM440** | Direct Japanese equivalent. | | **GB (China)** | **42CrMo** | Direct Chinese equivalent. | --- ## **5. Key Advantages & Considerations** **Advantages:** * **Exceptional Versatility:** Can be used annealed, pre-hardened, or heat-treated to a vast range of strengths to meet specific application needs. * **Superior Hardenability & Toughness:** Achieves high strength in large sections while maintaining good impact resistance. * **Good Fatigue & Wear Resistance:** Ideal for dynamically loaded components and wear surfaces. * **Weldability (with Precautions):** Can be welded successfully using proper pre-heat, post-heat, and low-hydrogen procedures, unlike many free-machining steels. **Considerations:** * **Machinability:** More difficult to machine than carbon steels, especially in pre-hardened or hardened conditions. * **Requires Heat Treatment for Highest Properties:** To achieve its full potential, quenching and tempering are usually required, adding cost and complexity. * **Distortion Risk:** Heat treatment can cause dimensional changes and distortion, which may require subsequent straightening or grinding. * **Corrosion Susceptibility:** Not stainless; requires protection (plating, coating, painting) for corrosion resistance. --- **Disclaimer:** The properties listed are typical ranges. Final properties are highly dependent on section size, specific heat treatment cycle (austenitizing temperature, quench medium, tempering time/temperature), and final microstructure. For engineering critical components, always consult **official Niagara LaSalle material certifications and technical data sheets** and involve qualified metallurgical expertise in specifying heat treatment. -:- For detailed product information, please contact sales. -: Niagara LaSalle 4140 Cold Finished Steel Bar Specification Dimensions Size： Diameter 20-1000 mm Length <5076 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. -: Niagara LaSalle 4140 Cold Finished Steel Bar Properties -:- For detailed product information, please contact sales. -:

Applications of Niagara LaSalle 4140 Cold Finished Steel Foil Bar -:- For detailed product information, please contact sales. -: Chemical Identifiers Niagara LaSalle 4140 Cold Finished Steel Foil Bar -:- For detailed product information, please contact sales. -:

Packing of Niagara LaSalle 4140 Cold Finished Steel Foil/Strip Bar -:- 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 1547 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