Niagara LaSalle CPO® Cold Finished Steel Wire

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

Niagara LaSalle CPO® Cold Finished Steel Bar Product Information -:- For detailed product information, please contact sales. -: # **Product Introduction: Niagara LaSalle CPO® Cold Finished Steel Bar** **CPO® (Carburized Precision Outer-diameter)** is a proprietary cold finished steel bar product developed by **Niagara LaSalle Corporation**, specifically engineered for the manufacture of **needle roller bearings and precision bearing components**. This material represents a specialized category within bearing-quality steels, optimized for the unique demands of carburizing heat treatment followed by precision grinding. CPO® steel is produced to exceptionally tight chemical, dimensional, and microstructural controls. It is designed to undergo **carburizing heat treatment** to develop an ultra-hard, wear-resistant case while maintaining a tough, fatigue-resistant core—the fundamental requirement for high-performance bearing raceways. The "Precision Outer-diameter" designation reflects its supplied condition: a cold-drawn bar with superior surface finish, strict diameter tolerances, and minimal ovality, ready for the final machining and heat treatment stages in bearing production. --- ## **1. Chemical Composition (Proprietary)** CPO® chemistry is based on high-purity, low-alloy carburizing steel formulations, with stringent control over hardenability-influencing elements and trace residuals to ensure consistent response to carburizing. A representative analysis is as follows (in weight %): | Element | Carbon (C) | Manganese (Mn) | Silicon (Si) | Chromium (Cr) | Nickel (Ni)* | Molybdenum (Mo)* | **Key Characteristic** | | :--- | :--- | :--- | :--- | :--- | :--- | :--- | :--- | | **Typical CPO®** | 0.15 - 0.20 | 0.55 - 0.90 | 0.15 - 0.35 | 0.85 - 1.25 | 0.25 - 0.75 | 0.08 - 0.18 | **Balanced alloy for deep, uniform case & tough core.** | | *Impurity Control* | Phosphorus (P): ≤ 0.020 | Sulfur (S): ≤ 0.015 | Oxygen [O]: Very Low | | | | **High Purity & Cleanliness** | **Critical Features of the Composition:** * **Low Core Carbon:** The base carbon content is kept low to ensure excellent core toughness and ductility after carburizing. * **Optimized Alloy Package (Cr, Ni, Mo):** This combination provides excellent **hardenability** for consistent case depth in oil quenching, promotes a fine-grained microstructure, and delivers superior core strength and fatigue resistance. * **Ultra-Low Impurities:** Extremely low levels of Phosphorus, Sulfur, and dissolved gases (oxygen, nitrogen) are maintained to **minimize non-metallic inclusions**. This is critical for achieving the high cleanliness required for bearing steel to prevent fatigue spalling (e.g., meeting ASTM A534 standards). * **Guaranteed Hardenability:** CPO® is supplied with a guaranteed hardenability band to ensure batch-to-batch consistency in final heat treatment results. --- ## **2. Physical & Mechanical Properties** Properties are defined for both the **supplied (cold-drawn & spheroidized annealed) condition** and the **final carburized & hardened state**. **A. Supplied (Cold Drawn & Annealed) Condition:** * **Hardness:** **≤ 90 HRB** (Typically 80-88 HRB). This soft state is essential for precision machining (turning, boring) prior to heat treatment. * **Microstructure:** Fine, uniform **spheroidized carbide structure** in a ferrite matrix, optimized for machinability and subsequent carburizing response. * **Surface Finish:** Excellent as-drawn finish, typically ≤ 30 µin Ra. * **Dimensional Accuracy:** Held to **precision tolerances** (e.g., ±0.001" or tighter) with minimal ovality and excellent straightness. **B. After Final Carburizing, Quenching & Tempering:** * **Surface (Case) Hardness:** **58 - 64 HRC** (Extremely hard for maximum wear and rolling contact fatigue resistance). * **Effective Case Depth:** Customizable via process, typically 0.020" - 0.080" (0.5 - 2.0 mm). * **Core Hardness:** **35 - 45 HRC** (Provides strong mechanical support to prevent case crushing under heavy loads). * **Core Tensile Strength:** 1000 - 1300 MPa range. * **Cleanness Rating:** Meets or exceeds stringent bearing steel standards (e.g., ASTM E45, SEP 1927) for oxide and sulfide inclusion control. --- ## **3. Product Applications** CPO® is the dedicated material solution for high-volume production of **critical, carburized bearing components**, primarily in the automotive and industrial sectors. * **Needle & Roller Bearing Components:** **Outer and inner races (cups and cones), needle roller bearing cages, and heavy-duty roller bearing races.** * **Automotive Transmissions:** **Transmission bearing races, synchronizer hubs, and clutch races.** * **Constant Velocity (CV) Joints:** **CV joint races and cages.** * **Precision Gears & Sprockets:** For applications where a deep, hard case is required alongside high core toughness. * **Other High-Stress Case-Hardened Parts:** Cam lobes, pins, and bushings subjected to rolling contact and high Hertzian stresses. --- ## **4. International & Equivalent Standards** CPO® is a proprietary brand that aligns with the highest specifications for carburizing bearing steels. Direct equivalents are other proprietary bearing grades, while standard grades are functionally similar but may lack the same level of integrated process control. | Standard System | Comparable Material / Note | **Key Relationship** | | :--- | :--- | :--- | | **Proprietary** | **Niagara LaSalle CPO®** | The primary, performance-guaranteed product. | | **ASTM** | **A534** (Carburizing Bearing Steels) | CPO® chemistry and cleanness meet or exceed the requirements for grades like 4118H, 5120H, 8620H under this standard. | | **SAE/AISI** | **8620H, 4320H, 4118H** | These are the closest standard **chemistry equivalents**. CPO® can be viewed as a premium, tightly controlled version of these grades with guaranteed processing. | | **DIN (EN)** | **1.6523 (20NiCrMo2-2)** / **1.7131 (16MnCr5)** | European carburizing steels with similar application profiles. | | **Bearing Specs** | **ABMA/ISO** Bearing Material Standards | CPO® is produced to meet the micro-cleanliness and hardenability requirements implicit in high-grade bearing specifications. | **Crucial Note:** While an engineer may design with **SAE 8620H**, specifying **CPO®** ensures the material is supplied with the integrated precision, cleanliness, and consistency controls required for optimal bearing performance. It is a **value-added condition** of a standard chemistry. --- ## **5. Key Advantages & Considerations** **Advantages:** * **Bearing-Optimized from Melt to Bar:** Entire production process is tailored for bearing applications, ensuring predictable performance in final components. * **Superior Cleanliness:** Ultra-low inclusion counts directly translate to improved rolling contact fatigue life and reliability. * **Precision "Ready-to-Machine" Form:** Tight dimensional tolerances and excellent straightness reduce setup time, improve machining yield, and ensure concentricity in the final bearing. * **Consistent Hardenability:** Guaranteed response to carburizing minimizes heat treat variation, ensuring uniform case depth and hardness across production batches. **Considerations:** * **Specialized Application:** Over-engineered and not cost-effective for non-bearing or non-carburizing applications. * **Requires Final Heat Treatment:** As-supplied properties are for machinability only; the full value is realized only after carburizing and hardening. * **Proprietary Supply:** Sourcing is limited to Niagara LaSalle and select licensed processors. * **Cost Premium:** Commands a higher price than commodity-grade carburizing steels due to the extensive process controls and testing involved. --- **Disclaimer:** CPO® is a high-performance engineered material. For specification and design of critical bearing components, it is imperative to consult the **latest official Niagara LaSalle CPO® technical data sheets** and collaborate closely with their technical service team to align material selection with specific application loads, life requirements, and manufacturing processes. -:- For detailed product information, please contact sales. -: Niagara LaSalle CPO® Cold Finished Steel Bar Specification Dimensions Size： Diameter 20-1000 mm Length <5067 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 CPO® Cold Finished Steel Bar Properties -:- For detailed product information, please contact sales. -:

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

Packing of Niagara LaSalle CPO® Cold Finished Steel Wire 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 Wire 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 1538 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