Description
30CrNi3Mo Alloy Steel: In-Depth Overview
30CrNi3Mo is a high-strength alloy steel known for its excellent mechanical properties and resistance to wear. It is widely used in various industrial applications that demand high performance and durability. This steel combines chromium, nickel, and molybdenum to achieve its superior characteristics.
Introduction to 30CrNi3Mo Alloy Steel
30CrNi3Mo is an alloy steel designed to offer a balance of strength, toughness, and resistance to wear and fatigue. It is often used in components that are subjected to high stress and require exceptional mechanical properties.
Key Features of 30CrNi3Mo Alloy Steel:
- High Strength: Provides superior tensile strength and yield strength.
- Good Toughness: Maintains impact resistance even at low temperatures.
- Wear Resistance: Enhanced by the presence of chromium and molybdenum.
- Excellent Hardness: Achieved through appropriate heat treatment.
Applications of 30CrNi3Mo Alloy Steel
30CrNi3Mo is utilized in various sectors due to its high strength and toughness. Its applications include:
Typical Applications:
- Automotive Components: Gear shafts, crankshafts, and camshafts.
- Industrial Machinery: High-load bearings, shafts, and gears.
- Oil and Gas Industry: Drilling equipment and components exposed to harsh conditions.
- Engineering: Structural components in heavy machinery and tools.
Equivalent Grades of 30CrNi3Mo Alloy Steel
30CrNi3Mo is recognized under several standards, ensuring compatibility across different applications and regions.
| Standard | Equivalent Grade |
|---|---|
| DIN | 1.6580 |
| EN | 30CrNi3Mo |
| AISI/SAE | 9310 |
| BS | 817M40 |
Chemical Composition of 30CrNi3Mo Alloy Steel
The chemical composition of 30CrNi3Mo is carefully controlled to provide the desired mechanical properties. The typical composition is as follows:
| Element | Composition (%) |
|---|---|
| Carbon (C) | 0.28 – 0.35 |
| Silicon (Si) | 0.20 – 0.35 |
| Manganese (Mn) | 0.50 – 0.80 |
| Phosphorus (P) | 0.035 max |
| Sulfur (S) | 0.035 max |
| Chromium (Cr) | 0.80 – 1.20 |
| Molybdenum (Mo) | 0.15 – 0.30 |
| Nickel (Ni) | 2.50 – 3.50 |
This composition ensures that the steel has the right balance of strength, hardness, and resistance to wear.
Mechanical Properties of 30CrNi3Mo Alloy Steel
The mechanical properties of 30CrNi3Mo are crucial for its performance in demanding applications. The following table summarizes these properties:
| Property | Value (Typical) |
|---|---|
| Tensile Strength (MPa) | 800 – 1000 |
| Yield Strength (MPa) | 600 – 800 |
| Elongation (%) | ≥ 15 |
| Impact Toughness (J) | ≥ 30 (at room temperature) |
| Hardness (HB) | 200 – 250 |
These values indicate the steel’s ability to withstand high stresses and impacts.
Heat Treatment of 30CrNi3Mo Alloy Steel
Proper heat treatment is essential for achieving the desired properties of 30CrNi3Mo. The following processes are commonly used:
- Hardening: Heat to 850 – 880°C and quench in oil or water to increase hardness.
- Tempering: Heat to 550 – 650°C after hardening to improve toughness and reduce brittleness.
- Normalizing: Heat to 850 – 880°C and air cool to refine grain structure and enhance toughness.
These treatments help tailor the steel’s properties for specific applications.
Hardness of 30CrNi3Mo Alloy Steel
The hardness of 30CrNi3Mo can be adjusted through heat treatment processes. Typical hardness values are:
- Annealed Condition: 190 – 210 HB
- After Hardening and Tempering: Up to 55 HRC
These hardness values reflect the steel’s capability to resist wear and deformation under load.
Physical Properties of 30CrNi3Mo Alloy Steel
The physical properties of 30CrNi3Mo contribute to its stability and performance. The following table summarizes these properties:
| Property | Value |
|---|---|
| Density (g/cm³) | 7.85 |
| Melting Point (°C) | 1420 – 1460 |
| Thermal Conductivity (W/m·K) | 45 |
| Specific Heat Capacity (J/kg·K) | 460 – 480 |
These properties ensure stability and performance in various operating conditions.
Forging Properties of 30CrNi3Mo Alloy Steel
30CrNi3Mo can be forged at temperatures ranging from 1150 – 1250°C. It is important to cool the forged components slowly to avoid internal stresses and maintain dimensional stability.
Stress Relieving for 30CrNi3Mo Alloy Steel
Stress relieving involves heating the steel to 600 – 650°C to remove residual stresses from machining or forming. This process improves dimensional stability and reduces the risk of deformation.
Normalizing 30CrNi3Mo Alloy Steel
Normalizing is performed by heating the steel to 850 – 880°C and allowing it to cool in air. This process enhances toughness and refines the grain structure.
Annealing 30CrNi3Mo Alloy Steel
Annealing involves heating the steel to 680 – 720°C and cooling it slowly in the furnace. This process improves machinability and prepares the steel for further heat treatments.
Machinability of 30CrNi3Mo Alloy Steel
30CrNi3Mo alloy steel exhibits good machinability, particularly in its annealed condition. It can be machined into complex shapes with standard cutting tools, although care should be taken to manage tool wear during high-hardness operations.
Welding of 30CrNi3Mo Alloy Steel
Welding of 30CrNi3Mo is feasible with proper preheating (to about 150 – 200°C) and post-weld heat treatment. Following 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.
