Description
15CrNiMo12 Alloy Steel Overview
15CrNiMo12 is a high-quality, low-alloy steel known for its exceptional mechanical properties and versatility. It belongs to the chromium-nickel-molybdenum steel family and is widely used in applications requiring high strength, toughness, and wear resistance. This alloy steel is particularly favored in the automotive and engineering industries due to its ability to withstand demanding conditions and its suitability for a variety of heat treatments.
Key Features of 15CrNiMo12 Alloy Steel:
- High Strength and Toughness: Offers excellent mechanical properties, including high tensile strength and impact resistance.
- Good Wear Resistance: Provides enhanced durability and resistance to wear, making it ideal for high-stress applications.
- Versatile Heat Treatment: Can be heat treated to achieve desired hardness and mechanical properties, including improved fatigue strength and toughness.
Applications of 15CrNiMo12 Alloy Steel
15CrNiMo12 is utilized in various industries where high strength, toughness, and wear resistance are essential. Its properties make it suitable for components that operate under high stress and harsh conditions.
Typical Applications Include:
- Automotive Components: Gear wheels, crankshafts, and camshafts.
- Engineering Machinery: Components such as shafts, axles, and connecting rods.
- Industrial Equipment: High-stress components in heavy machinery and equipment.
- General Engineering: Parts requiring high fatigue strength and wear resistance, such as valve components and pressure vessels.
Equivalent Grades of 15CrNiMo12 Alloy Steel
15CrNiMo12 alloy steel has equivalent grades in different international standards, providing flexibility for various regional requirements.
| Standard | Equivalent Grade |
|---|---|
| DIN | 15CrNiMo12 |
| EN | 1.5715 |
| AISI/SAE | 8620 |
| BS | 817M40 |
| UNS | G86200 |
Chemical Composition of 15CrNiMo12 Alloy Steel
The chemical composition of 15CrNiMo12 is crucial for achieving its desired mechanical properties. The following table outlines the typical composition of this alloy steel:
| Element | Composition (%) |
|---|---|
| Carbon (C) | 0.12 – 0.18 |
| Silicon (Si) | 0.20 – 0.40 |
| Manganese (Mn) | 0.40 – 0.70 |
| Phosphorus (P) | ≤ 0.035 |
| Sulfur (S) | ≤ 0.035 |
| Chromium (Cr) | 1.00 – 1.30 |
| Nickel (Ni) | 1.00 – 1.50 |
| Molybdenum (Mo) | 0.15 – 0.30 |
This composition ensures the steel maintains its strength, toughness, and wear resistance.
Mechanical Properties of 15CrNiMo12 Alloy Steel
The mechanical properties of 15CrNiMo12 are vital for its performance in demanding applications. The following table summarizes the typical mechanical properties:
| Property | Value (Typical) |
|---|---|
| Tensile Strength (MPa) | 600 – 800 |
| Yield Strength (MPa) | 400 – 600 |
| Elongation (%) | ≥ 12 |
| Impact Toughness (J) | ≥ 40 (at room temperature) |
| Hardness (HB) | 200 – 250 |
These properties highlight the steel’s capability to perform under high-stress conditions.
Heat Treatment of 15CrNiMo12 Alloy Steel
Heat treatment is essential to optimize the mechanical properties of 15CrNiMo12. The typical heat treatment processes include:
- Hardening: Heat to 830 – 860°C and quench in oil or water to achieve high hardness and strength.
- Tempering: Heat to 200 – 250°C after hardening to enhance toughness and reduce brittleness.
- Normalizing: Heat to 850 – 900°C and air cool to refine the grain structure and improve toughness.
These processes ensure the steel achieves the desired balance of strength, toughness, and hardness.
Hardness of 15CrNiMo12 Alloy Steel
The hardness of 15CrNiMo12 can vary depending on the heat treatment it undergoes. Typical hardness values are:
- Annealed Condition: 190 – 210 HB
- After Hardening and Tempering: Up to 55 HRC
These hardness values indicate the steel’s ability to provide high strength and wear resistance.
Physical Properties of 15CrNiMo12 Alloy Steel
The physical properties of 15CrNiMo12 ensure its stability and performance under various operating conditions. The following table summarizes these properties:
| Property | Value |
|---|---|
| Density (g/cm³) | 7.85 |
| Melting Point (°C) | 1420 – 1450 |
| Thermal Conductivity (W/m·K) | 30 – 35 |
| Specific Heat Capacity (J/kg·K) | 460 – 480 |
These properties ensure that 15CrNiMo12 alloy steel performs reliably across different temperature and load conditions.
Forging Properties of 15CrNiMo12 Alloy Steel
15CrNiMo12 can be forged within the temperature range of 1150 – 1250°C. It is important to cool the forged components slowly to avoid internal stresses and ensure dimensional stability.
Stress Relieving for 15CrNiMo12 Alloy Steel
Stress relieving involves heating the steel to 600 – 650°C to remove residual stresses from machining or forming. This process is followed by slow cooling to improve dimensional stability.
Normalizing 15CrNiMo12 Alloy Steel
Normalizing is performed by heating the steel to 850 – 900°C and allowing it to cool in air. This process improves toughness and refines the grain structure.
Annealing 15CrNiMo12 Alloy Steel
Annealing involves heating the steel to 680 – 720°C and cooling it slowly in the furnace. This process enhances machinability and prepares the steel for further heat treatments.
Machinability of 15CrNiMo12 Alloy Steel
15CrNiMo12 alloy steel offers good machinability, especially in its annealed condition. It can be machined into complex shapes with standard cutting tools, though tool wear should be managed during high-hardness operations.
Welding of 15CrNiMo12 Alloy Steel
Welding of 15CrNiMo12 is feasible with proper preheating (to about 150 – 200°C) and post-weld heat treatment. Adhering to appropriate welding procedures helps prevent issues such as cracking or reduced toughness.
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.
