Description
50CrMo4 Alloy Steel: Comprehensive Guide
50CrMo4 is a high-quality alloy steel known for its excellent mechanical properties, including high strength, toughness, and wear resistance. It is frequently used in engineering applications that demand high performance and reliability under stress.
Introduction to 50CrMo4 Alloy Steel
50CrMo4 is a chromium-molybdenum alloy steel that is widely used in various industrial sectors due to its superior strength and durability. It is often supplied in a heat-treated condition to optimize its mechanical properties, making it suitable for demanding applications.
Key Features of 50CrMo4 Alloy Steel:
- High Strength: Provides exceptional tensile and yield strength.
- Toughness: Excellent impact resistance and toughness.
- Wear Resistance: Good resistance to wear and abrasion.
- Heat Treatability: Capable of achieving desired mechanical properties through heat treatment.
Applications of 50CrMo4 Alloy Steel
50CrMo4 is used in a wide range of applications where high strength and durability are required. Its properties make it suitable for components that are exposed to significant stress and wear.
Typical Applications Include:
- Automotive Industry: Crankshafts, camshafts, and gear shafts.
- Engineering Components: Heavy-duty gears, axles, and high-load bearings.
- Industrial Machinery: Components in manufacturing and processing equipment.
- Construction: Structural components and high-strength fasteners.
Equivalent Grades of 50CrMo4 Alloy Steel
50CrMo4 is recognized under various international standards, ensuring compatibility and interchangeability across different markets.
| Standard | Equivalent Grade |
|---|---|
| DIN | 1.7228 |
| EN | 50CrMo4 |
| AISI/SAE | 4140 |
| BS | 817M40 |
Chemical Composition of 50CrMo4 Alloy Steel
The chemical composition of 50CrMo4 is crucial for achieving its desired mechanical properties. The following table outlines the typical composition:
| Element | Composition (%) |
|---|---|
| Carbon (C) | 0.48 – 0.55 |
| Silicon (Si) | 0.40 max |
| Manganese (Mn) | 0.60 – 0.90 |
| Phosphorus (P) | 0.035 max |
| Sulfur (S) | 0.035 max |
| Chromium (Cr) | 0.90 – 1.20 |
| Molybdenum (Mo) | 0.15 – 0.30 |
This composition ensures the steel’s high strength, toughness, and resistance to wear.
Mechanical Properties of 50CrMo4 Alloy Steel
The mechanical properties of 50CrMo4 are essential for evaluating its performance in various applications. The following table summarizes these properties:
| Property | Value (Typical) |
|---|---|
| Tensile Strength (MPa) | 850 – 1000 |
| Yield Strength (MPa) | 650 – 850 |
| Elongation (%) | ≥ 12 |
| Impact Toughness (J) | ≥ 35 (at room temperature) |
| Hardness (HB) | 255 – 295 |
These values indicate the alloy’s ability to withstand high stresses and impacts.
Heat Treatment of 50CrMo4 Alloy Steel
Heat treatment processes are used to enhance the mechanical properties of 50CrMo4. The following processes are commonly employed:
- Hardening: Heat to 850 – 880°C and quench in oil or water to achieve high hardness and strength.
- 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 heat treatments allow for customization of the steel’s properties for specific applications.
Hardness of 50CrMo4 Alloy Steel
The hardness of 50CrMo4 can vary based on the heat treatment. Typical hardness values are:
- Annealed Condition: 220 – 260 HB
- After Hardening and Tempering: Up to 50 HRC
These hardness values reflect the steel’s ability to provide high strength and wear resistance.
Physical Properties of 50CrMo4 Alloy Steel
The physical properties of 50CrMo4 contribute to its performance and reliability. 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 the alloy’s stability and performance under various conditions.
Forging Properties of 50CrMo4 Alloy Steel
50CrMo4 can be forged within the temperature range of 1150 – 1250°C. It is crucial to cool the forged components slowly to avoid internal stresses and maintain dimensional stability.
Stress Relieving for 50CrMo4 Alloy Steel
Stress relieving involves heating the steel to 600 – 650°C to remove residual stresses from machining or forming. This process helps improve dimensional stability and reduce the risk of deformation.
Normalizing 50CrMo4 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, improving overall mechanical properties.
Annealing 50CrMo4 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 50CrMo4 Alloy Steel
50CrMo4 alloy steel exhibits good machinability, especially 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 50CrMo4 Alloy Steel
Welding of 50CrMo4 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.
