Description
17CrNiMo6 Alloy Steel Introduction
17CrNiMo6 is a high-strength alloy steel known for its excellent mechanical properties and versatility. This steel combines chromium, nickel, and molybdenum to deliver exceptional strength, toughness, and hardenability. It is widely used in the automotive and engineering industries for manufacturing components that require high fatigue resistance, wear resistance, and impact strength.
17CrNiMo6 is commonly supplied in a quenched and tempered condition, providing a good balance between hardness and toughness. Its unique composition and processing characteristics make it suitable for applications that involve significant mechanical stress and load.
17CrNiMo6 Alloy Steel Application
17CrNiMo6 alloy steel is used in a variety of high-performance applications across several industries:
- Automotive Industry: Gear wheels, drive shafts, and crankshafts that need high strength and durability.
- Engineering: Structural components, couplings, and spindles requiring high fatigue resistance.
- Aerospace: Parts like landing gear and turbine shafts where high toughness and strength are essential.
- Oil and Gas: Drilling equipment and high-pressure components that endure harsh operating conditions.
- Industrial Machinery: Heavy-duty gears, camshafts, and components subjected to high stresses and strains.
17CrNiMo6 Alloy Steel Equivalent Grades
Here are some equivalent grades for 17CrNiMo6 across various standards:
| Standard | Equivalent Grade |
|---|---|
| DIN | 1.6587 |
| BS | 817M40 |
| AISI/SAE | 4340 |
| UNS | G43400 |
| JIS | SNCM439 |
17CrNiMo6 Alloy Steel Chemical Composition
The chemical composition of 17CrNiMo6 is crucial for its mechanical properties and includes:
| Element | Composition (%) |
|---|---|
| Carbon (C) | 0.14 – 0.19 |
| Silicon (Si) | 0.10 – 0.35 |
| Manganese (Mn) | 0.60 – 0.90 |
| Nickel (Ni) | 1.20 – 1.80 |
| Chromium (Cr) | 1.40 – 1.80 |
| Molybdenum (Mo) | 0.15 – 0.30 |
| Phosphorus (P) | 0.035 max |
| Sulfur (S) | 0.035 max |
17CrNiMo6 Alloy Steel Mechanical Properties
The mechanical properties of 17CrNiMo6, as outlined below, demonstrate its suitability for high-stress applications:
| Property | Value (Typical) |
|---|---|
| Tensile Strength (MPa) | 930 – 1080 |
| Yield Strength (MPa) | 780 |
| Elongation (%) | 12 |
| Impact Toughness (J) | 40 (at 20°C) |
| Hardness (HB) | 248 – 302 |
17CrNiMo6 Alloy Steel Heat Treatment
The heat treatment process for 17CrNiMo6 is essential for achieving the desired mechanical properties:
- Annealing: Heat to 830-870°C, hold until uniform, then cool slowly in the furnace to relieve internal stresses and refine grain structure.
- Hardening: Heat to 830-870°C, followed by quenching in oil or water to increase hardness.
- Tempering: After hardening, temper at 500-650°C to balance hardness with toughness.
17CrNiMo6 Alloy Steel Hardness
In its hardened and tempered condition, 17CrNiMo6 typically has a hardness range of 248 – 302 HB. This range provides a good balance between strength and ductility, suitable for demanding applications.
17CrNiMo6 Alloy Steel Physical Properties
The physical properties of 17CrNiMo6 are vital for understanding its behavior under various conditions:
| Property | Value |
|---|---|
| Density (g/cm³) | 7.85 |
| Melting Point (°C) | 1425 |
| Thermal Conductivity (W/m·K) | 45 |
| Specific Heat Capacity (J/kg·K) | 460 |
17CrNiMo6 Alloy Steel Forging Properties
17CrNiMo6 can be forged at temperatures ranging from 850 – 1150°C. Post-forging, the material should be cooled slowly to prevent the development of internal stresses and potential cracking.
17CrNiMo6 Alloy Steel Stress Relieving
For components subjected to significant machining or deformation, stress relieving should be performed by heating to 550 – 650°C, holding for a sufficient period, and then cooling slowly. This process helps to reduce residual stresses and improve dimensional stability.
17CrNiMo6 Alloy Steel Normalizing
Normalizing involves heating to 830 – 870°C and air cooling. This process refines the grain structure and enhances the material’s mechanical properties.
17CrNiMo6 Alloy Steel Annealing
Annealing for 17CrNiMo6 requires heating to 830 – 870°C, holding it at this temperature, and then slowly cooling in the furnace. This treatment reduces hardness, improves machinability, and relieves internal stresses.
17CrNiMo6 Alloy Steel Machinability
17CrNiMo6 exhibits good machinability when in the normalized or annealed condition. Sharp cutting tools and appropriate machining parameters are recommended to achieve optimal results and extend tool life.
17CrNiMo6 Alloy Steel Welding
Welding of 17CrNiMo6 is feasible but requires careful handling to avoid potential issues. Preheating to 150 – 250°C is recommended to prevent cracking. Post-weld heat treatment is often necessary to ensure the integrity of the weld and mitigate residual stresses.
Supply Cities:
Mumbai Ahmedabad, Amaravathi, Ambattur, Bangalore, Belgaum, Chennai, Chittoor, Coimbatore, Dindigul, Mysore, Nellore, Hyderabad, Kochi, Mangalore, Tirupur, Tuticorin, Madurai, Andhra Pradesh, Karnataka, Puducherry, Kerala, Tamil Nadu, Telangana, Visakhapatnam, Kochi, Kerala, Hubli-Dharwad, Karnataka, Ghaziabad Kolkata.
