Niagara LaSalle StressProof® Cold Finished Steel Seamless tube

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

Niagara LaSalle StressProof® Cold Finished Steel Bar Product Information -:- For detailed product information, please contact sales. -: # **Product Introduction: Niagara LaSalle StressProof® Steel Bar** **StressProof®** is a registered trademark and proprietary product line of **Niagara LaSalle Corporation**, a leading North American producer of special bar quality (SBQ) steel. It is a **cold-drawn, strain-hardened, and stress-relieved steel bar** renowned for its exceptionally high yield strength, excellent straightness, and superb machinability—all achieved **without heat treatment**. This material represents a distinct category in engineering steel, offering a unique combination of properties ideal for high-precision, high-strength components. The proprietary cold drawing and thermal stress-relieving process imparts a fine-grained microstructure with controlled residual stresses, resulting in the "stress-proof" characteristic: minimal distortion during machining and superior dimensional stability under load. --- ## **1. Chemical Composition (Proprietary)** StressProof® is based on a medium-carbon steel chemistry with precise control over alloying and residual elements to optimize its response to the cold drawing process. The typical composition range is as follows (in weight %): | Element | Carbon (C) | Manganese (Mn) | Sulfur (S) | Other Key Features | | :--- | :--- | :--- | :--- | :--- | | **Content** | 0.40 - 0.55 | 1.20 - 1.65 | 0.080 - 0.130 | Controlled Silicon, Phosphorus, and optional lead (StressProof® 1144-L) for enhanced machinability. | **Critical Features of the Composition:** * **Controlled Medium Carbon:** Provides the foundational strength potential. * **High Manganese:** Significantly increases hardenability and strength from cold work. * **Re-sulfurized:** Sulfur content is precisely controlled to form manganese sulfide (MnS) inclusions. These act as chip breakers during machining, dramatically improving machinability (typically rated at **85% of 1212 free-machining steel**), without significantly compromising transverse properties due to the unique processing. * **Consistent Quality:** Melting practices ensure low levels of oxides and undesirable elements to guarantee uniform response to cold working. --- ## **2. Physical & Mechanical Properties (Typical for Standard Grade)** The defining characteristic of StressProof® is its remarkable set of "as-supplied" mechanical properties, which are consistent across the bar diameter. | Property | Typical Value | **Key Distinguishing Feature** | | :--- | :--- | :--- | | **Yield Strength (0.2% Offset)** | **100,000 psi (690 MPa) (Minimum)** | **Exceptionally high and uniform yield strength without quenching & tempering.** | | **Tensile Strength** | 115,000 psi (795 MPa) | | | **Elongation (in 2")** | 15% | Maintains good ductility despite high strength. | | **Reduction of Area** | 50% | | | **Machinability Rating** | **85% (vs. B1112/1212)** | One of the most machinable high-strength steels available. | | **Surface Finish (as-drawn)** | 125 micro-inch (3.2 µm) Ra or better | Excellent for precision parts. | | **Straightness** | Exceptionally straight; typically ≤ 0.001" per inch. | Critical for reducing pre-machining preparation. | | **Stress Relief** | Fully stress-relieved after drawing. | Ensures dimensional stability during and after machining. | **Note:** Properties are guaranteed in the longitudinal direction. Transverse properties (ductility, impact) are lower, which is typical of re-sulfurized steels. Special grades like **FatigueProof®** offer higher strength (~125 ksi min yield). --- ## **3. Product Applications** StressProof® is the material of choice for high-volume production of **complex, close-tolerance components** that require high strength, stability, and excellent machinability, particularly where heat treatment is undesirable or would cause distortion. * **Hydraulic & Pneumatic Components:** **Piston rods, cylinder barrels, valve bodies, pump shafts, and hydraulic fittings.** * **Automotive & Truck:** Steering components (pinions, shafts), transmission shafts, parking brake levers, and high-strength fasteners. * **Aerospace:** Landing gear components, actuator parts, and non-critical flight hardware. * **Industrial Machinery:** Lead screws, guide rods, arbors, spindle shafts, and high-strength tie-rods. * **General Precision Parts:** Any part where the cost of post-machining straightening or heat treatment distortion must be eliminated. --- ## **4. International & Equivalent Standards** As a **proprietary brand**, there is no direct, universally equivalent standard grade. Its unique combination of properties places it between several standard material categories. It is often specified on engineering drawings as **"StressProof® Steel per Niagara LaSalle."** | Standard System | Comparable Material / Note | **Key Difference** | | :--- | :--- | :--- | | **Proprietary** | **Niagara LaSalle StressProof®** | The original and defining product. | | **ASTM A311** | Class B (Cold-Drawn, Stress-Relieved) | A similar *type* of product, but StressProof® has guaranteed, higher minimum properties and is a specific, optimized brand. | | **SAE/AISI** | **1144 (Stressproof)** | Often informally called "1144 Stressproof," but true StressProof® is a tightly controlled brand, not just any 1144. | | **SAE/AISI** | 1045, 4140 (QT) | Comparable strength, but those require heat treatment with associated distortion, scaling, and lower machinability. | | **DIN (EN)** | 1.0715 (9SMn28) or 1.0503 (C45) | Similar sulfur content or carbon level, but lack the integrated cold-working process for high "as-supplied" strength. | **Crucial Note:** **StressProof® is a brand, not a chemistry.** While based on a modified 1144-type analysis, specifying "SAE 1144" does not guarantee StressProof® properties. For critical applications, sourcing to the Niagara LaSalle specification is essential. --- ## **5. Key Advantages & Considerations** **Advantages:** * **High Strength, No Heat Treat:** Eliminates costs and complexities of quenching & tempering (energy, distortion, scaling, decarburization). * **Superb Machinability:** Allows for higher cutting speeds, longer tool life, and better surface finishes than traditional alloy steels of similar strength. * **Excellent Dimensional Stability:** The stress-relieved condition ensures parts stay straight and true during and after machining. * **Uniform Properties:** Consistent mechanical properties from surface to core and bar to bar. **Considerations:** * **Proprietary Material:** Sourcing is tied to certified mills/distributors. Not a commodity grade. * **Anisotropic Properties:** Transverse ductility and impact strength are lower than longitudinal; parts should be designed with loading direction in mind. * **Weldability:** **Not recommended for welding.** The high sulfur content and cold-worked structure lead to a high risk of cracking. * **Maximum Operating Temperature:** Properties are stable up to ~400°F (204°C). Exposure to higher temperatures (e.g., during coating) can cause relaxation and loss of strength. --- **Disclaimer:** This overview describes the standard StressProof® grade. Niagara LaSalle offers variants like **FatigueProof®** (higher strength) and **La-Led®** (lead-bearing). For engineering and design, always consult the **official Niagara LaSalle technical data sheets** and engage with their technical support team for material selection and processing guidance. -:- For detailed product information, please contact sales. -: Niagara LaSalle StressProof® Cold Finished Steel Bar Specification Dimensions Size： Diameter 20-1000 mm Length <5065 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 StressProof® Cold Finished Steel Bar Properties -:- For detailed product information, please contact sales. -:

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

Packing of Niagara LaSalle StressProof® Cold Finished Steel Seamless tube 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 Seamless tube 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 1536 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