AISI E4340 Steel Seamless tube,

AISI E4340 Steel Seamless tube, annealed, 25 mm round Product Information -:- For detailed product information, please contact sales. -: AISI E4340 Steel Seamless tube, annealed, 25 mm round Synonyms -:- For detailed product information, please contact sales. -:

AISI E4340 Steel, annealed, 25 mm round Product Information -:- For detailed product information, please contact sales. -: ### **Product Introduction: AISI E4340 Alloy Steel Round Bar, Annealed Condition, 25 mm Diameter** **Overview** AISI E4340 is a high-strength, low-alloy steel renowned for its exceptional toughness, good fatigue strength, and high hardenability. Supplied in the **annealed condition**, the 25 mm diameter round bar offers optimal machinability and a uniform, soft microstructure, making it an ideal starting material for parts that will undergo subsequent heat treatment (quenching and tempering) to achieve their final mechanical properties. This grade is a workhorse material for demanding applications in aerospace, automotive, and heavy industry. **Key Advantages** * **Superior Hardenability:** Deep hardening characteristics allow for the development of high strength throughout thick sections. * **Excellent Strength-Toughness Balance:** After heat treatment, it achieves an outstanding combination of tensile strength and impact resistance. * **Good Machinability (in Annealed State):** The soft, annealed structure facilitates easier turning, milling, and drilling compared to its hardened state. * **Fatigue Resistance:** Well-suited for components subjected to cyclic loading. --- #### **1. Chemical Composition (Standard Conformity)** The composition adheres to standard specifications, ensuring consistent performance. | Element | Content (%) | Standard Reference | | :--- | :--- | :--- | | **Iron (Fe)** | Balance | - | | **Nickel (Ni)** | 1.65 - 2.00 | Primary alloy for toughness & hardenability | | **Chromium (Cr)** | 0.70 - 0.90 | Enhances hardenability and wear resistance | | **Molybdenum (Mo)**| 0.20 - 0.30 | Promotes strength at high temperatures & hardenability | | **Manganese (Mn)** | 0.60 - 0.80 | Aids hardenability and deoxidization | | **Carbon (C)** | 0.38 - 0.43 | Provides core strength and hardness | | **Silicon (Si)** | 0.15 - 0.30 | Deoxidizer and strengthens ferrite | | **Phosphorus (P)** | ≤ 0.035 | Impurity (controlled) | | **Sulphur (S)** | ≤ 0.040 | Impurity (controlled) | **Applicable International/Dimensional Standards:** * **ASTM A29/A29M:** Standard Specification for Steel Bars, Carbon and Alloy, Hot-Wrought and Cold-Finished * **AMS 6414:** Aerospace Material Specification (common for 4340) * **SAE J434:** Automotive Standard (covers chemical and hardness ranges) * **Diameter Tolerance:** Typically per ASTM A29, Cold Finished or Hot Rolled tolerance grades. #### **2. Physical & Mechanical Properties (Annealed Condition)** *Note: Properties are for the "as-supplied" annealed condition. Final properties are achieved after quenching and tempering.* | Property | Value / Description | Condition / Note | | :--- | :--- | :--- | | **Hardness** | 197 - 241 HB | Brinell Hardness, typical for annealed state | | **Tensile Strength** | ~ 655 MPa (95 ksi) | Approximate, annealed | | **Yield Strength** | ~ 415 MPa (60 ksi) | Approximate, annealed | | **Elongation** | ~ 22% | In 50 mm, typical | | **Reduction of Area** | ~ 50% | Typical | | **Density** | 7.85 g/cm³ | | | **Modulus of Elasticity** | 190 - 205 GPa | | | **Machinability** | ~ 55% (of 1% C steel) | Good in annealed state | #### **3. Typical Applications** This 25mm round bar is processed into critical components that are later heat-treated. Common applications include: * **Aerospace:** Landing gear components, engine mounts, critical bolts, and airframe parts. * **Automotive & Racing:** High-performance crankshafts, connecting rods, axle shafts, and transmission gears. * **Oil & Gas:** Drill collars, tool joints, and high-strength fasteners for downhole equipment. * **General Engineering:** Heavy-duty gears, pinions, studs, bolts, and machine parts requiring high strength and fatigue resistance. * **Defense:** Components for armored vehicles and artillery. #### **4. Heat Treatment Note** As-supplied in the **annealed condition**, this product is designed for **subsequent heat treatment**: 1. **Austenitizing:** ~ 830°C - 850°C (1525°F - 1560°F), followed by oil quenching. 2. **Tempering:** Typically between 425°C - 650°C (800°F - 1200°F) to achieve the desired strength-toughness balance. *After proper quenching and tempering, tensile strength can exceed 1500 MPa (220 ksi).* --- **Disclaimer:** This information is for reference purposes. Specific properties may vary slightly between melts and manufacturers. Always consult the manufacturer's data sheet and conduct appropriate testing for critical applications. -:- For detailed product information, please contact sales. -: AISI E4340 Steel, annealed, 25 mm round Specification Dimensions Size： Diameter 20-1000 mm Length <4066 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 E4340 Steel, annealed, 25 mm round Properties -:- For detailed product information, please contact sales. -:

Applications of AISI E4340 Steel Seamless tube, annealed, 25 mm round -:- For detailed product information, please contact sales. -: Chemical Identifiers AISI E4340 Steel Seamless tube, annealed, 25 mm round -:- For detailed product information, please contact sales. -:

Packing of AISI E4340 Steel Seamless tube, annealed, 25 mm round -:- 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 537 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