AISI E4340 Steel, oil quenched

AISI E4340 Steel, oil quenched 800°C (1470°F), 540°C (1000°F) temper, 13 mm (0.5 in.) round Product Information -:- For detailed product information, please contact sales. -: AISI E4340 Steel, oil quenched 800°C (1470°F), 540°C (1000°F) temper, 13 mm (0.5 in.) round Synonyms -:- For detailed product information, please contact sales. -:

AISI E4340 Steel, oil quenched 800°C (1470°F), 540°C (1000°F) temper, 13 mm (0.5 in.) round Product Information -:- For detailed product information, please contact sales. -: # **AISI E4340 Alloy Steel Round Bar** ## **Heat-Treated to High Strength Condition** ### **Product Overview** **AISI E4340 Steel, Oil Quenched & Tempered** - **Diameter:** 13 mm (0.5 inch) Round Bar - **Heat Treatment:** - Austenitizing: 800°C (1470°F) - Quenching: Oil - Tempering: 540°C (1000°F) - **Condition:** Directly usable in final heat-treated state - **Primary Feature:** Excellent combination of high strength, good toughness, and fatigue resistance ### **1. CHEMICAL COMPOSITION** | Element | Content (%) | Function in Steel | |---------|-------------|-------------------| | Carbon (C) | 0.38-0.43 | Provides core strength and hardenability | | Manganese (Mn) | 0.60-0.80 | Enhances hardenability and strength | | Silicon (Si) | 0.15-0.30 | Deoxidizer, strengthens ferrite | | Nickel (Ni) | 1.65-2.00 | **Key element:** Improves toughness and hardenability | | Chromium (Cr) | 0.70-0.90 | Increases hardenability and wear resistance | | Molybdenum (Mo) | 0.20-0.30 | Enhances strength, prevents temper embrittlement | | Phosphorus (P) | ≤0.035 | Impurity (controlled) | | Sulfur (S) | ≤0.040 | Impurity (controlled) | | Iron (Fe) | Balance | Base metal | ### **2. MATERIAL SPECIFICATIONS & STANDARDS** | Standard Type | Standard Number | Description | |--------------|----------------|-------------| | **UNS Number** | G43400 | Unified Numbering System | | **ASTM** | A29/A29M-22 | Standard Specification for Steel Bars | | **SAE/AISI** | 4340 | Standard designation | | **AMS** | 6414, 6415 | Aerospace Material Specification | | **DIN** | 1.6565/34CrNiMo6 | German equivalent | | **ISO** | 683-11 | Heat-treatable steels | | **JIS** | SNCM439 | Japanese equivalent | ### **3. MECHANICAL PROPERTIES** *(After 800°C Oil Quench + 540°C Temper)* #### **Tensile Properties** | Property | Typical Value | Testing Standard | |----------|---------------|------------------| | **Tensile Strength** | 1150-1250 MPa (167-181 ksi) | ASTM E8/E8M | | **Yield Strength (0.2% offset)** | 1000-1100 MPa (145-160 ksi) | ASTM E8/E8M | | **Elongation in 4D** | 14-18% | ASTM E8/E8M | | **Reduction of Area** | 48-55% | ASTM E8/E8M | | **Modulus of Elasticity** | 205 GPa (29.7×10⁶ psi) | - | #### **Hardness & Toughness** | Property | Typical Value | Testing Standard | |----------|---------------|------------------| | **Hardness** | 35-40 HRC (321-375 HB) | ASTM E18, E10 | | **Charpy V-Notch Impact** | 40-55 J (30-40 ft-lb) at 20°C | ASTM E23 | | **Fatigue Strength** | ~550 MPa (rotating bending, R=-1) | - | ### **4. PHYSICAL PROPERTIES** | Property | Value at 20°C | Condition | |----------|---------------|-----------| | Density | 7.85 g/cm³ (0.284 lb/in³) | - | | Melting Point | ~1427°C (2600°F) | - | | Thermal Conductivity | 44.5 W/m·K | Annealed | | Electrical Resistivity | 0.22 μΩ·m | - | | Coefficient of Thermal Expansion | 12.3 ×10⁻⁶/K (20-100°C) | - | ### **5. HEAT TREATMENT DETAILS** #### **Applied Treatment:** 1. **Austenitizing:** 800°C (1470°F) ±10°C, soak time appropriate for 13mm diameter 2. **Quenching:** Rapid oil quench to room temperature 3. **Tempering:** 540°C (1000°F) ±10°C, held for sufficient time, air cooled #### **Microstructure:** - **Primary Structure:** Tempered martensite - **Grain Size:** ASTM 6-8 (typical) - **Uniformity:** Full through-hardening due to small diameter and alloy content ### **6. TYPICAL APPLICATIONS** #### **Aerospace Industry** - Aircraft landing gear components - Engine mounts and brackets - High-strength fasteners and bolts - Critical structural pins and shafts #### **Automotive & Racing** - High-performance connecting rods - Crankshafts and camshafts - Transmission gears and shafts - Race car suspension components #### **Oil & Gas Equipment** - Drill string components - Tool joints and subs - High-pressure valve parts #### **General Engineering** - Heavy-duty machine axles - High-strength bolts and studs - Hydraulic piston rods - Gear shafts and pinions - Press tools and dies ### **7. PROCESSING CHARACTERISTICS** #### **Machinability:** - **Rating:** 55% (compared to 1% carbon steel as 100%) - **Recommended Tools:** Carbide or coated carbide tools - **Cutting Speed:** Medium to slow with adequate cooling #### **Weldability:** - **Rating:** Poor (requires special precautions) - **Preheat Required:** 150-260°C (300-500°F) - **Post-Weld Heat Treatment:** Mandatory to restore properties - **Recommended Methods:** GTAW (TIG) or SMAW with low-hydrogen electrodes #### **Grindability:** - Good with proper wheel selection and cooling - Avoid excessive heat generation to prevent tempering effects ### **8. QUALITY ASSURANCE & TESTING** #### **Standard Testing:** - Chemical analysis (spectroscopic) - Hardness testing (multiple locations) - Microstructure examination - Tensile testing (representative samples) #### **Optional Testing:** - Charpy impact testing - Non-destructive testing (MPI, ultrasonic) - Fatigue testing - Fracture toughness testing ### **9. TECHNICAL ADVANTAGES** 1. **Superior Strength-to-Weight Ratio:** High strength with moderate density 2. **Excellent Hardenability:** Full hardening through 13mm section 3. **Good Fatigue Resistance:** Suitable for cyclic loading applications 4. **Maintains Properties at Moderate Temperatures:** Stable up to approximately 400°C 5. **Predictable Heat Treatment Response:** Consistent results due to controlled composition ### **10. HANDLING & STORAGE RECOMMENDATIONS** - Store in dry conditions to prevent corrosion - Handle with care to avoid surface damage - Protect from mechanical damage during transportation - Apply rust preventive oil if long-term storage is required --- **Note:** This technical data represents typical values. For critical applications, specific testing and validation for the actual material batch is recommended. The properties may vary slightly depending on the exact heat treatment parameters, furnace characteristics, and material origin. Always consult with material engineers for application-specific requirements. **Manufacturing Standards:** This product is manufactured under strict quality control procedures in compliance with ISO 9001 quality management systems. -:- For detailed product information, please contact sales. -: AISI E4340 Steel, oil quenched 800°C (1470°F), 540°C (1000°F) temper, 13 mm (0.5 in.) round Specification Dimensions Size： Diameter 20-1000 mm Length <4067 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, oil quenched 800°C (1470°F), 540°C (1000°F) temper, 13 mm (0.5 in.) round Properties -:- For detailed product information, please contact sales. -:

Applications of AISI E4340 Steel, oil quenched 800°C (1470°F), 540°C (1000°F) temper, 13 mm (0.5 in.) round -:- For detailed product information, please contact sales. -: Chemical Identifiers AISI E4340 Steel, oil quenched 800°C (1470°F), 540°C (1000°F) temper, 13 mm (0.5 in.) round -:- For detailed product information, please contact sales. -:

Packing of AISI E4340 Steel, oil quenched 800°C (1470°F), 540°C (1000°F) temper, 13 mm (0.5 in.) 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 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 538 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