Description
55Cr3 Alloy Steel: In-Depth Overview
55Cr3 is a high-carbon, high-chromium alloy steel known for its exceptional hardness, wear resistance, and strength. This steel is commonly used in applications where high strength and durability are crucial, such as in the manufacturing of high-wear components and tools.
55Cr3 Grade Introduction
55Cr3 is a medium-carbon steel alloy with added chromium, which enhances its hardenability and resistance to wear. This steel is valued for its ability to maintain high hardness and strength even under severe operating conditions, making it ideal for parts subjected to high mechanical stresses.
Chemical Composition
The chemical composition of 55Cr3 is designed to provide a balance of hardness, strength, and wear resistance:
| Element | Content (%) |
|---|---|
| Carbon (C) | 0.50 – 0.55 |
| Manganese (Mn) | 0.60 – 0.90 |
| Phosphorus (P) | ≤ 0.035 |
| Sulfur (S) | ≤ 0.035 |
| Chromium (Cr) | 1.30 – 1.60 |
| Silicon (Si) | 0.15 – 0.35 |
Mechanical Properties
55Cr3 provides robust mechanical properties suitable for high-stress applications:
| Property | Value |
|---|---|
| Tensile Strength (MPa) | ≥ 1200 |
| Yield Strength (MPa) | ≥ 1000 |
| Elongation Rate (%) | ≥ 8 |
| Impact Toughness (J/cm²) | ≥ 50 |
| Hardness (HB) | 240 – 260 HB |
Hardness
The typical hardness range for 55Cr3 is between 240 and 260 HB. This high hardness makes it suitable for applications where wear resistance is essential.
Heat Treatment
55Cr3 undergoes several heat treatment processes to achieve the desired properties:
- Hardening:
- Heating: Heat to 850-880°C.
- Quenching: Typically done in oil or water to achieve high hardness.
- Tempering: Performed at 200-250°C to relieve stresses and improve toughness.
Physical Properties
55Cr3 has the following physical properties:
| Property | Value |
|---|---|
| Modulus of Elasticity (N/mm²) | 210 × 10³ |
| Density (g/cm³) | 7.85 |
| Thermal Conductivity (W/m.K) | 20.0 |
Thermal Properties
- Thermal Conductivity: 20.0 W/m.K
Forging Properties
55Cr3 can be hot-formed within the temperature range of 1100°C to 850°C.
Stress Relieving
Stress relief heat treatment is performed to reduce internal stresses after cold working.
Normalizing
Normalizing is conducted at 850-880°C, followed by air cooling to refine the microstructure and enhance mechanical properties.
Annealing
Annealing is performed at 850-880°C, followed by furnace cooling to relieve stress and improve machinability.
Welding
55Cr3 has good weldability, although it is recommended to preheat and perform post-weld heat treatment to avoid potential issues like cracking due to its high carbon content.
Equivalent Grades
55Cr3 can be compared to several other steel grades with similar properties:
| Standard | Equivalent Grade |
|---|---|
| GB | 55Cr3 |
| JIS | SK5 |
| ASTM | 5160 |
| DIN | 1.7220 |
Applications
55Cr3 is used in a variety of demanding applications due to its high strength and hardness:
- Tooling: Ideal for making tools and dies subjected to high wear and mechanical stress.
- Springs: Utilized in the manufacture of high-strength springs.
- Gears and Shafts: Suitable for components that experience high loads and wear.
- High-Wear Components: Components in machinery and equipment that require high wear resistance.
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.
