Niagara LaSalle Fatigue-Proof® Cold Finished Steel Sheet,Plate

Niagara LaSalle Fatigue-Proof® Cold Finished Steel Sheet/Plate Bar Product Information -:- For detailed product information, please contact sales. -: Niagara LaSalle Fatigue-Proof® Cold Finished Steel Sheet/Plate Bar Synonyms -:- For detailed product information, please contact sales. -:

Niagara LaSalle Fatigue-Proof® Cold Finished Steel Bar Product Information -:- For detailed product information, please contact sales. -: # **Product Introduction: Niagara LaSalle Fatigue-Proof® Cold Finished Steel Bar** **Fatigue-Proof®** is a registered trademark and proprietary high-strength steel bar product developed by **Niagara LaSalle Corporation**. It is an **alloy steel bar processed through cold drawing and thermal treatment** to achieve an exceptional combination of ultra-high yield strength, excellent fatigue resistance, and good machinability **in the as-supplied condition, without quenching & tempering heat treatment**. This material is engineered for highly stressed, dynamically loaded components where resistance to fatigue failure is paramount. It occupies a unique position in the material spectrum, offering strength levels comparable to heat-treated alloy steels (like 4140 QT) but with the dimensional stability, straightness, and machinability of a cold-finished product. The name "Fatigue-Proof" is derived from its superior endurance limit relative to its tensile strength. --- ## **1. Chemical Composition (Proprietary)** Fatigue-Proof® is based on a specific, controlled alloy steel chemistry designed to develop high strength through cold work and precipitation hardening during its proprietary thermal-mechanical processing. Its composition is distinct from standard carbon steels. A typical analysis is as follows (in weight %): | Element | Carbon (C) | Manganese (Mn) | Silicon (Si) | Chromium (Cr) | Molybdenum (Mo) | Sulfur (S) | | :--- | :--- | :--- | :--- | :--- | :--- | :--- | | **Content** | 0.40 - 0.50 | 1.20 - 1.60 | 1.35 - 1.80 | 0.40 - 0.80 | 0.08 - 0.18 | 0.040 - 0.070 | | **Role** | Core Strength | Hardenability & Strength | **Primary Strengthener**, raises endurance limit | Hardenability & Wear | Enhances Hardenability & Toughness | Machinability | **Critical Features of the Composition & Process:** * **High Silicon (Si):** This is the signature element. Silicon is a potent ferrite strengthener that significantly **raises the endurance (fatigue) limit** and contributes to the high yield strength achieved without traditional martensitic hardening. * **Balanced Alloying (Cr, Mo):** These elements enhance hardenability during the proprietary thermal cycle, contributing to the through-section strength uniformity and toughness. * **Controlled Sulfur (S):** Added to form manganese sulfides, which act as chip breakers, granting Fatigue-Proof® **surprisingly good machinability (approx. 75% of B1112)** for its very high strength level. * **Proprietary Processing:** The specific sequence of cold drawing and controlled thermal treatment induces a fine-grained, heavily strain-hardened microstructure with precipitated carbides, resulting in its unique property set. --- ## **2. Physical & Mechanical Properties (Typical)** Fatigue-Proof® is defined by its guaranteed minimum mechanical properties, which are exceptionally high for an as-delivered, machinable bar. | Property | **Guaranteed Minimum / Typical Value** | **Engineering Significance** | | :--- | :--- | :--- | | **Yield Strength (0.2% Offset)** | **125,000 psi (862 MPa)** | **Exceptionally high yield strength**, exceeding that of many quenched & tempered steels, providing a large margin against plastic deformation. | | **Tensile Strength** | 140,000 psi (965 MPa) | | | **Elongation (in 2")** | 12% | Maintains useful ductility despite ultra-high strength. | | **Reduction of Area** | 40% | | | **Endurance Limit** | **~65,000 - 70,000 psi** (Smooth specimen) | **Key Benefit:** A very high fatigue strength-to-tensile strength ratio (~0.5), leading to the "Fatigue-Proof" performance in cyclic loading. | | **Machinability Rating** | **75% (vs. B1112/1212)** | Outstanding for its strength level, allowing for productive machining. | | **Surface Hardness** | **HRC 30 - 36** (Typical range) | Provides inherent wear resistance. | | **Core Hardness** | Uniform throughout cross-section. | No soft core, unlike case-hardened parts. | | **Straightness & Finish** | Excellent as-drawn straightness; Good surface finish. | Reduces pre-machining preparation and ensures part accuracy. | --- ## **3. Product Applications** Fatigue-Proof® is specified for **safety-critical, highly stressed components** subject to dynamic loads, vibration, and cyclic stresses where fatigue failure is a primary design concern. * **Aerospace & Defense:** **Landing gear components, actuator shafts, flight control linkages, and missile parts.** * **High-Performance Automotive:** **Racing crankshafts, connecting rods, suspension components (tie rods, spindles), and high-stress fasteners.** * **Oil & Gas / Hydraulics:** **Valve bodies, pump shafts, hydraulic piston rods, and fittings** for high-pressure systems. * **Printing & Packaging Machinery:** **Heavily loaded cam shafts, drive shafts, and actuator arms.** * **General High-Stress Components:** **Studs, pins, gears, and levers** in applications where weight savings and reliability under cyclic load are critical. --- ## **4. International & Equivalent Standards** As a **proprietary brand with a unique chemistry/process combination**, there is no direct, universally equivalent standard grade. It is a specialist material that stands apart. | Standard System | Comparable Material / Note | **Key Difference** | | :--- | :--- | :--- | | **Proprietary** | **Niagara LaSalle Fatigue-Proof®** | The only source for this specific material with guaranteed properties. | | **ASTM A311** | Class D (Cold-Drawn, Stress-Relieved Alloy) | A similar *category*, but Fatigue-Proof® has a unique Si-Cr-Mo chemistry and higher guaranteed properties. | | **SAE/AISI** | **Modified 4140/4142 (QT)** | To achieve similar strength (140-150 ksi TS), 4140 requires full quenching & tempering, resulting in lower machinability, potential distortion, and decarburization. Fatigue-Proof® provides it "as-is." | | **SAE/AISI** | 4340 (QT) | An even higher-strength alloy steel, but again, requires heat treatment with all its associated complexities and costs. | | **DIN (EN)** | 1.7176 (50CrMo4) or similar | May approximate the Cr-Mo base, but lacks the high Silicon and the proprietary processing. | **Crucial Note:** Fatigue-Proof® is often the **performance benchmark**. Engineers may use standard alloy steels (like 4140 QT) to *approach* its properties, but specifying "Fatigue-Proof®" ensures the guaranteed high yield strength, fatigue limit, and machinability in the as-supplied form. --- ## **5. Key Advantages & Considerations** **Advantages:** * **Ultra-High Strength, No Heat Treat:** Eliminates the cost, time, distortion, and scaling associated with quenching & tempering. * **Superior Fatigue Resistance:** The high endurance limit is its defining characteristic, ideal for components with infinite life design goals. * **Excellent Machinability:** Remarkably good for its strength, enabling complex part machining with good tool life. * **Uniform Properties & Stability:** Homogeneous properties through the cross-section and excellent dimensional stability during machining. **Considerations:** * **Premium Cost:** Significantly more expensive than standard carbon or alloy steel bars due to its specialized chemistry and processing. * **Limited Weldability:** **Not recommended for welding.** The high silicon and carbon content, combined with the cold-worked structure, make it highly susceptible to cracking. * **Temperature Limitation:** Like all cold-worked steels, its properties will begin to degrade if exposed to temperatures above approximately **400°F (204°C)** for prolonged periods. * **Proprietary Source:** Solely available from Niagara LaSalle and its authorized distributors. --- **Disclaimer:** The information pertains to the standard Fatigue-Proof® grade. For engineering design of critical components, it is essential to consult the **latest official Niagara LaSalle Fatigue-Proof® technical data sheets** and engage with their application engineering team. Properties are guaranteed in the longitudinal direction; designers should account for anisotropic behavior in transverse loading. -:- For detailed product information, please contact sales. -: Niagara LaSalle Fatigue-Proof® Cold Finished Steel Bar Specification Dimensions Size： Diameter 20-1000 mm Length <5068 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 Fatigue-Proof® Cold Finished Steel Bar Properties -:- For detailed product information, please contact sales. -:

Applications of Niagara LaSalle Fatigue-Proof® Cold Finished Steel Sheet,Plate Bar -:- For detailed product information, please contact sales. -: Chemical Identifiers Niagara LaSalle Fatigue-Proof® Cold Finished Steel Sheet,Plate Bar -:- For detailed product information, please contact sales. -:

Packing of Niagara LaSalle Fatigue-Proof® Cold Finished Steel Sheet/Plate 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 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 1539 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