Description
17CrNi6 Alloy Steel Overview
17CrNi6 is a medium-carbon alloy steel that is highly valued for its mechanical strength and toughness. This steel combines chromium and nickel to provide superior hardenability, wear resistance, and strength. It is widely used in applications requiring high performance and durability under stress, such as in automotive components and structural engineering.
The alloy’s properties make it particularly suitable for components that undergo significant loading and stress, such as gears, shafts, and connecting rods. It is often supplied in a quenched and tempered condition to enhance its mechanical characteristics.
17CrNi6 Alloy Steel Applications
17CrNi6 alloy steel is employed in a variety of demanding applications across different industries due to its excellent mechanical properties:
- Automotive Industry: Gears, shafts, crankshafts, and camshafts that require high strength and fatigue resistance.
- Engineering: Structural components, connecting rods, and heavy-duty machinery parts that endure high stress and loading.
- Aerospace: Aircraft components and landing gear where toughness and strength are critical.
- Oil and Gas: Drilling equipment, high-pressure fittings, and components exposed to harsh operational environments.
Equivalent Grades for 17CrNi6
Here are some equivalent grades for 17CrNi6 across various standards:
| Standard | Equivalent Grade |
|---|---|
| DIN | 1.5715 |
| BS | 817M40 |
| AISI/SAE | 4340 |
| UNS | G43400 |
| JIS | SNCM439 |
Chemical Composition of 17CrNi6
The chemical composition of 17CrNi6 significantly influences its mechanical properties. Below is the typical composition:
| 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 |
Mechanical Properties of 17CrNi6
The mechanical properties of 17CrNi6 are crucial for its performance in high-stress applications. The properties are as follows:
| 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 |
Heat Treatment of 17CrNi6
Proper heat treatment is essential to achieve the desired mechanical properties:
- Annealing: Heat to 830-870°C, hold until uniform, and cool slowly to relieve internal stresses and refine the grain structure.
- Hardening: Heat to 830-870°C and quench in oil or water to increase hardness.
- Tempering: After hardening, temper at 500-650°C to balance hardness with toughness.
Hardness of 17CrNi6
In its hardened and tempered condition, 17CrNi6 typically exhibits a hardness range of 248 – 302 HB. This range ensures a good balance between strength and ductility.
Physical Properties of 17CrNi6
The physical properties of 17CrNi6 are essential 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 |
Forging Properties of 17CrNi6
17CrNi6 can be forged at temperatures ranging from 850 – 1150°C. After forging, the material should be cooled slowly to prevent the development of internal stresses and potential cracking.
Stress Relieving for 17CrNi6
To remove residual stresses from machining or deformation, stress relieving should be performed by heating to 550 – 650°C, holding for a sufficient period, and then cooling slowly.
Normalizing 17CrNi6
Normalizing involves heating to 830 – 870°C and air cooling. This process refines the grain structure and enhances the material’s mechanical properties.
Annealing 17CrNi6
Annealing for 17CrNi6 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.
Machinability of 17CrNi6
17CrNi6 exhibits good machinability in the normalized or annealed condition. For optimal results, use sharp cutting tools and appropriate machining parameters to extend tool life.
Welding of 17CrNi6
Welding of 17CrNi6 is feasible but requires careful handling to avoid potential issues. Preheat to 150 – 250°C to prevent cracking, and consider post-weld heat treatment to ensure the integrity of the weld.
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.
