Description
15NCD4 Alloy Steel Overview
15NCD4 is a high-strength alloy steel known for its excellent combination of hardness, toughness, and wear resistance. This steel is characterized by the presence of nickel and chromium, which enhance its mechanical properties and make it suitable for demanding applications. It is particularly valued in the automotive and engineering sectors for components requiring high performance and durability.
15NCD4 is often used in applications where components are subjected to high stress and require resistance to wear and impact. It is commonly supplied in a heat-treated condition to maximize its mechanical properties.
15NCD4 Alloy Steel Applications
15NCD4 alloy steel is employed in a variety of critical applications across multiple industries due to its exceptional mechanical properties:
- Automotive Industry: Gear components, crankshafts, camshafts, and other high-stress parts.
- Engineering: Structural components, drive shafts, and components for heavy machinery.
- Industrial Machinery: Parts exposed to high loads and wear, such as gears, bearings, and pins.
- Aerospace: Components requiring high strength and fatigue resistance.
Equivalent Grades for 15NCD4
Here are some equivalent grades for 15NCD4 across various standards:
| Standard | Equivalent Grade |
|---|---|
| DIN | 1.5715 |
| BS | 817M40 |
| AISI/SAE | 4340 |
| UNS | G43400 |
| JIS | SNCM439 |
Chemical Composition of 15NCD4
The chemical composition of 15NCD4 plays a critical role in determining its mechanical properties. The typical composition is as follows:
| Element | Composition (%) |
|---|---|
| Carbon (C) | 0.14 – 0.20 |
| Silicon (Si) | 0.20 – 0.35 |
| Manganese (Mn) | 0.60 – 0.90 |
| Nickel (Ni) | 1.40 – 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 15NCD4
The mechanical properties of 15NCD4 are essential for understanding its performance under various conditions. The properties are as follows:
| Property | Value (Typical) |
|---|---|
| Tensile Strength (MPa) | 850 – 1050 |
| Yield Strength (MPa) | 750 |
| Elongation (%) | 10 – 15 |
| Impact Toughness (J) | 40 (at 20°C) |
| Hardness (HB) | 230 – 285 |
Heat Treatment of 15NCD4
Heat treatment is crucial for achieving the desired mechanical properties in 15NCD4. Here are the key heat treatment processes:
- Annealing: Heat to 830-870°C, hold until uniform, and then cool slowly to relieve internal stresses and refine the grain structure.
- Hardening: Heat to 830-870°C, and then quench in oil or water to increase hardness.
- Tempering: After hardening, temper at 500-650°C to balance hardness with toughness.
Hardness of 15NCD4
In its hardened and tempered condition, 15NCD4 typically exhibits a hardness range of 230 – 285 HB. This range provides a balance between strength and ductility suitable for high-stress applications.
Physical Properties of 15NCD4
Understanding the physical properties of 15NCD4 is important for its application in 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 15NCD4
15NCD4 can be forged at temperatures between 850 – 1150°C. After forging, the material should be cooled slowly to avoid internal stresses and potential cracking.
Stress Relieving for 15NCD4
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 15NCD4
Normalizing involves heating to 830 – 870°C and air cooling. This process refines the grain structure and improves mechanical properties.
Annealing 15NCD4
Annealing for 15NCD4 requires heating to 830 – 870°C, holding at this temperature, and then slowly cooling in the furnace. This treatment improves machinability and relieves internal stresses.
Machinability of 15NCD4
15NCD4 exhibits good machinability in the normalized or annealed condition. For optimal results, use sharp cutting tools and appropriate machining parameters to enhance tool life and surface finish.
Welding of 15NCD4
Welding of 15NCD4 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.
