AISI 9255 Steel, normalized

AISI 9255 Steel, normalized at 900°C (1650°F) Product Information -:- For detailed product information, please contact sales. -: AISI 9255 Steel, normalized at 900°C (1650°F) Synonyms -:- For detailed product information, please contact sales. -:

AISI 9255 Steel, normalized at 900°C (1650°F) Product Information -:- For detailed product information, please contact sales. -: **Product Introduction: AISI 9255 Steel, Normalized at 900°C (1650°F)** **1. Product Overview** AISI 9255 is a high-silicon, medium-high carbon alloy spring steel renowned for its exceptional strength, fatigue resistance, and hardenability. Supplied in the **normalized condition** (heated to ~900°C / 1650°F and air-cooled), this material offers a refined, uniform grain structure that improves machinability and provides a consistent foundation for subsequent heat treatment operations. Normalization enhances the steel's homogeneity and mechanical response, making it an ideal starting condition for manufacturing high-performance, high-stress components. **2. International Standards & Designations** This steel grade is specified under several major international standards, ensuring global consistency. * **AISI (USA):** 9255 * **ASTM (USA):** A29 (Standard Specification for Steel Bars, Carbon and Alloy, Hot-Wrought) * **SAE (USA):** J403, J412 * **UNS:** G92550 * **DIN (Germany):** 55Si7 (1.0909) * **EN (Europe):** 55Si7 (1.0909) – The direct equivalent. * **JIS (Japan):** SUP7 – A closely related silicon-manganese spring steel. **3. Chemical Composition (Typical % by Weight)** The composition is engineered for optimal spring performance. * **Carbon (C):** 0.50 - 0.60 * **Manganese (Mn):** 0.70 - 0.95 * **Silicon (Si):** 1.80 - 2.20 *(Key alloying element: increases strength, hardenability, and resistance to temper softening)* * **Phosphorus (P):** ≤ 0.035 * **Sulfur (S):** ≤ 0.040 * **Iron (Fe):** Balance **4. Physical & Mechanical Properties (Normalized Condition)** Normalization produces a fine pearlitic structure with improved strength and toughness over the annealed state. * **Condition:** Normalized (~900°C, air cool) * **Hardness (Brinell):** Typically 229 - 285 HB * **Tensile Strength:** ~790 - 930 MPa (115 - 135 ksi) * **Yield Strength:** ~485 MPa (70 ksi) minimum * **Elongation:** ~18% * **Reduction of Area:** ~35% * **Modulus of Elasticity:** ~205 GPa (30 x 10⁶ psi) * **Density:** 7.85 g/cm³ **5. Key Product Features & Benefits** * **Refined & Uniform Microstructure:** Normalization eliminates coarse grains from prior hot-working, ensuring consistent properties and predictable behavior during hardening. * **Enhanced Machinability:** The normalized structure offers better machinability compared to the as-forged or as-rolled condition, though slightly less than fully annealed. * **Optimal Pre-Condition for Hardening:** Provides a clean, homogenous starting point for subsequent quenching and tempering, leading to superior final properties. * **Improved Strength & Toughness:** Higher as-supplied strength than annealed material, beneficial for some handling and initial forming operations. * **Inherent High Hardness & Wear Resistance Potential:** After final heat treatment, achieves very high surface hardness (45-52 HRC) and wear resistance. **6. Primary Applications** AISI 9255 in normalized form is used for critical, high-load spring applications where reliability and fatigue life are paramount. * **Heavy-Duty Suspension Springs:** Coil and leaf springs for trucks, railway carriages, and off-road vehicles. * **Torsion Bars & Stabilizer Bars:** For automotive and aerospace suspensions. * **High-Stress Valve Springs & Clutch Springs.** * **Industrial Disc Springs (Belleville Washers)** for high-load applications. * **Agricultural and Construction Equipment Parts** requiring resilience under impact and cyclic loading. **7. Processing Considerations** * **Forming:** Can be formed in the normalized state, though more force may be required compared to annealed material. Final forming is often done after heating. * **Machining:** Good machinability with appropriate tools and speeds. The normalized structure is generally preferred for consistent tool life over variable as-rolled conditions. * **Heat Treatment:** **This is a heat-treatable steel.** Normalized parts are routinely subjected to final quenching (oil) and tempering to achieve the required high strength, elasticity, and fatigue resistance. Normalization prior to hardening minimizes distortion and improves final properties. * **Welding:** Not generally recommended. If unavoidable, requires stringent pre-heat, post-heat (stress relieving), and use of low-hydrogen electrodes. **Conclusion** AISI 9255 steel in the normalized condition is a high-quality, engineered material specifically processed to provide a superior and consistent foundation for manufacturing the most demanding spring components. Its refined grain structure ensures optimal performance after final heat treatment, delivering the exceptional fatigue strength, high elastic limit, and durability required by critical applications across the automotive, heavy machinery, and industrial sectors. -:- For detailed product information, please contact sales. -: AISI 9255 Steel, normalized at 900°C (1650°F) Specification Dimensions Size： Diameter 20-1000 mm Length <6393 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 9255 Steel, normalized at 900°C (1650°F) Properties -:- For detailed product information, please contact sales. -:

Applications of AISI 9255 Steel, normalized at 900°C (1650°F) -:- For detailed product information, please contact sales. -: Chemical Identifiers AISI 9255 Steel, normalized at 900°C (1650°F) -:- For detailed product information, please contact sales. -:

Packing of AISI 9255 Steel, normalized at 900°C (1650°F) -:- 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 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 2864 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