AISI 9260 Steel Seamless tube

AISI 9260 Steel Seamless tube Product Information -:- For detailed product information, please contact sales. -: AISI 9260 Steel Seamless tube Synonyms -:- For detailed product information, please contact sales. -:

AISI 9260 Steel Product Information -:- For detailed product information, please contact sales. -: ### **Product Datasheet: AISI 9260 Alloy Steel** --- #### **1. Material Overview** **AISI 9260** is a **high-silicon, high-carbon alloy steel** belonging to the **"92xx" series** in the SAE/AISI system. The designation indicates a nominal composition of **0.60% carbon** and **2.00% silicon**. This specific combination of high carbon and very high silicon content makes it a **premium spring steel** and **shock-resistant alloy**, offering an exceptional combination of **high elastic limit, excellent fatigue resistance, and good hardenability**. It is specifically engineered for applications requiring maximum resilience and durability under repeated cyclic loading. #### **2. Key Material Concept** The exceptional performance of AISI 9260 stems from its unique alloying strategy: - **High Carbon (C ~0.60%):** Provides the fundamental capacity for high strength and hardness after heat treatment. - **Very High Silicon (Si ~2.00%):** This is the **defining characteristic**. Silicon: 1. **Dramatically increases the elastic limit** (the stress at which permanent deformation begins), which is the single most important property for a spring material. 2. **Significantly improves hardenability**, allowing for deeper hardening than a plain carbon steel (e.g., 1060). 3. **Enhances resistance to temper softening**, allowing the steel to retain its hardness and strength at moderately elevated temperatures. 4. **Promotes the formation of fine, tough microstructures** (like lower bainite) upon quenching, which contributes to superior fatigue life. - This Si-C combination makes 9260 superior to standard spring steels like 5160 or 8660 for applications where maximum deflection and energy storage per unit volume are critical. #### **3. International Standard & Cross-References** - **Primary Standard:** **SAE J404** (Chemical Compositions of SAE Alloy Steels) / **AISI 9260** - **UNS Designation:** **G92600** - **ASTM Standards:** Commonly supplied under **ASTM A29/A29M** for bars. Spring wire is covered under **ASTM A877/A877M** for oil-tempered Si-Cr alloy steel wire. - **AMS (Aerospace Material Specification):** Not a common aerospace grade. - **European Approximate Equivalent:** **1.0904 (60SiCr7)** or **1.0906 (60SiCr8)** according to EN 10089 (Spring steels). The Si content in European grades is typically slightly lower (1.40-1.80%). - **Japanese Approximate Equivalent:** **SUP7** (Silicon-manganese spring steel, JIS G4801) is a close functional match, though SUP7 has Mn as the primary alloy. - **"H" Grade Variant:** **9260H** is available, conforming to **ASTM A304** for controlled hardenability. #### **4. Chemical Composition (% by Weight, per SAE J404)** | Element | Content Range (%) | Key Role | | :--- | :--- | :--- | | **Carbon (C)** | **0.56 – 0.64** | Primary hardening element; provides high strength and hardness. | | **Manganese (Mn)** | **0.75 – 1.00** | Enhances hardenability and strength. | | **Phosphorus (P)** | **≤ 0.035** | Impurity; kept very low to prevent embrittlement. | | **Sulfur (S)** | **≤ 0.040** | Impurity; kept very low. | | **Silicon (Si)** | **1.80 – 2.20** | **The Key Alloy.** Dramatically increases elastic limit, hardenability, and resistance to tempering. | | **Chromium (Cr)** | **Not specified** (typically ≤0.35 residual) | May be present as a residual element; not an intentional addition in standard 9260. | | **Iron (Fe)** | **Balance** | Base metal. | #### **5. Typical Physical & Mechanical Properties** *Properties are highly dependent on heat treatment (typically quenched and tempered).* **A. Physical Properties:** - **Density:** 7.85 g/cm³ (0.284 lb/in³) - **Modulus of Elasticity:** 205 GPa (29.7 x 10⁶ psi) - **Poisson’s Ratio:** 0.29 - **Thermal Conductivity:** ~42 W/m·K (lower than average due to high Si). **B. Mechanical Properties by Condition:** * **Annealed Condition (for forming):** * **Hardness:** 187 – 229 HBW * **Condition:** Soft state suitable for coiling or forming springs. * **Heat-Treated Spring Condition (Quenched & Tempered):** * **Tensile Strength:** 1300 – 1700 MPa (189 – 247 ksi) * **Yield Strength (0.2% Offset):** 1150 – 1500 MPa (167 – 218 ksi) * **Elongation:** 8% – 12% * **Hardness:** 44 – 50 HRC (Typical for springs) * **Fatigue Strength:** **Exceptionally High.** The high Si content provides superior resistance to fatigue crack initiation. * **Elastic Limit/Ratio:** Very high (typically >90% of tensile strength). #### **6. Processing & Fabrication Characteristics** - **Hardenability:** **Very Good.** The high Si (and Mn) content provides good depth of hardening, suitable for oil quenching of moderate sections. - **Machinability (Annealed):** **Poor.** The high silicon content makes the steel tough and abrasive, leading to rapid tool wear. Requires appropriate tooling and speeds. - **Formability (Annealed):** **Fair.** Can be cold coiled or formed, but the high strength in the annealed state requires more force than lower-alloy steels. - **Weldability:** **Very Poor.** The high carbon and silicon content create extreme susceptibility to cracking. Welding is **not recommended** for spring applications. If absolutely necessary, requires extreme preheat and post-weld heat treatment. - **Decarburization Sensitivity:** **Extremely High.** Silicon promotes severe surface decarburization during hot working and heat treatment. This is detrimental to fatigue life. Processing often requires protective atmospheres or allowance for subsequent grinding. - **Heat Treatment:** Requires careful control due to decarb sensitivity. * **Hardening:** Austenitize at 840-870°C (1545-1600°F), **oil quench**. * **Tempering:** Temper between 425-540°C (800-1000°F) to achieve desired hardness and toughness balance. #### **7. Primary Applications** AISI 9260 is the material of choice for the most demanding spring and resilient applications: - **High-Performance Springs:** **Heavy-duty coil springs** for automotive suspension (especially high-performance/truck), **railway vehicle springs**, **industrial valve springs**, and **high-stress torsion bars**. - **Springs for Elevated Temperatures:** Where some retention of strength and relaxation resistance is needed (benefiting from Si's tempering resistance). - **Hand Tools:** **High-quality wrenches, pry bars, and scrapers** requiring excellent toughness and resistance to permanent bending. - **Agricultural Equipment:** **High-stress leaf springs** and **tillage tools**. - **Shock Absorber Components:** Where high energy absorption is critical. #### **8. Available Forms** - **Most Common:** **Hot-rolled or cold-drawn round and flat bar** for spring fabrication. **Oil-tempered spring wire** is a very common form. - **Other Forms:** Occasionally as forgings. **Disclaimer:** This datasheet provides characteristic information. **AISI 9260 is a specialty spring steel.** Its successful application requires strict control over decarburization during processing. For critical spring applications, specify **decarb-free** or **decarb-controlled** material and consider the **9260H** grade for consistent hardenability in large sections. Final spring performance is highly dependent on surface finish, heat treatment, and shot peening. Always consult with spring manufacturers and metallurgists for design and processing. -:- For detailed product information, please contact sales. -: AISI 9260 Steel Specification Dimensions Size： Diameter 20-1000 mm Length <5191 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 9260 Steel Properties -:- For detailed product information, please contact sales. -:

Applications of AISI 9260 Steel Seamless tube -:- For detailed product information, please contact sales. -: Chemical Identifiers AISI 9260 Steel Seamless tube -:- For detailed product information, please contact sales. -:

Packing of AISI 9260 Steel Seamless tube -:- 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 1662 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