SAE 4340, 34CRNİMO6, Material Number: 1.6582 Alloyed Machine Construction Steels (Tempered Steels)
PRODUCT DESCRIPTION
34CrNiMo6 is a high-strength steel offering excellent hardness, machinability, and weldability, ideal for automotive, machinery, and heavy-duty applications.PRODUCT TYPES
- Stock is available for Hot Rolling, Forged and Peeled Steels with diameter between 25 mm and 750 mm
34CrNiMo6: Overview
34CrNiMo6 is a high-strength steel alloy that offers excellent hardness, wear resistance, and machinability. It is widely used in applications requiring high tensile strength and wear resistance, such as automotive, machinery, and heavy-duty industrial sectors. This steel is ideal for the production of gears, shafts, crankshafts, and other critical mechanical components. It provides reliable performance in high-stress and high-temperature environments.
Thanks to its outstanding characteristics, 34CrNiMo6 is suitable for applications where durability, resistance to wear, and the ability to handle significant mechanical stress are critical. The alloy also exhibits good weldability and machinability, making it versatile for various manufacturing processes. With the right heat treatment processes, its mechanical properties can be further enhanced.
Chemical Composition (in %)
| Element | Composition (%) |
|---|---|
| Carbon (C) | 0.34 max |
| Silicon (Si) | 0.40 max |
| Manganese (Mn) | 0.50 – 0.80 |
| Phosphorus (P) | 0.025 max |
| Sulfur (S) | 0.025 max |
| Chromium (Cr) | 0.90 – 1.20 |
| Nickel (Ni) | 1.50 – 2.00 |
| Molybdenum (Mo) | 0.15 – 0.30 |
| Copper (Cu) | 0.35 max |
Physical Properties
- Density: 7.85 g/cm³ (or 7850 kg/m³)
- Tensile Strength (Rm): 850–1000 MPa
- Yield Strength (Rp0.2): 700 MPa (min)
- Elongation (A): ≥ 12% (for thickness up to 20 mm)
- Hardness (HB): 210–250
Machinability
Despite its high strength and hardness, 34CrNiMo6 offers good machinability. The alloy can be efficiently processed using appropriate cutting tools and speeds. It is suitable for various machining operations, including turning, milling, and drilling. Its machinability is enhanced by its optimal chemical composition.
Machining Tips:
- High-speed steel (HSS) or carbide tools should be used for better performance.
- Cutting speeds and tool life should be optimized to prevent excessive wear.
- Coolants should be used to avoid overheating during machining.
Weldability
34CrNiMo6 provides good weldability when the right welding techniques are used. Preheating is recommended for thicker sections, while low-hydrogen electrodes improve the quality of welds. Post-weld heat treatment (PWHT) may be required for thicker sections to avoid cracking.
Welding Guidelines:
- Preheating is generally recommended for sections thicker than 30 mm.
- Low hydrogen electrodes should be used for optimal weld quality.
- Post-weld heat treatment is recommended for thick sections to avoid cracking.
Applications
34CrNiMo6 is widely used in industries where high strength, hardness, and wear resistance are required. Common applications include:
- Automotive Industry: Gears, shafts, crankshafts
- Machinery Manufacturing: Load-bearing components, shafts, turbines
- Heavy Industry: High-performance motor parts, gears
- Energy Sector: Turbines, high-stress components
Industries Using 34CrNiMo6 Steel
- Automotive Industry: Gears, shafts, and motor components.
- Machinery Manufacturing: Load-bearing components, gears, and shafts.
- Energy Sector: Turbines, compressors, and high-stress components.
- Heavy Equipment Manufacturing: Gears and shafts for heavy-duty machinery.
Key Advantages of 34CrNiMo6
- High Strength and Hardness: Resistant to wear and mechanical stress.
- Good Weldability: Can be welded using various techniques.
- Machinability: Can be efficiently processed despite its hardness.
- Wear Resistance: Ideal for high-stress applications.
- Versatility: Used across various industries, including automotive, machinery, and energy sectors.