Description
25Cr2Mo1V Grade Introduction:
25Cr2Mo1V is an alloy steel known for its high-temperature strength, creep resistance, and toughness. This steel offers excellent wear resistance, good weldability, and temper resistance, making it ideal for use in harsh, high-pressure, and high-temperature environments. It is commonly used in components that are subject to high mechanical stress, such as turbine rotors, pressure vessels, and pipelines in the power generation and petrochemical industries.
25Cr2Mo1V Grade Applications:
25Cr2Mo1V is widely used for critical components like turbine blades, shafts, and pressure vessels, as well as open-die steel forgings in heavy engineering applications. Its resistance to creep and oxidation at elevated temperatures makes it suitable for use in boilers and heat exchangers.
Equivalent Grades:
- GB: 25Cr2Mo1V
- ASTM: Similar to ASTM A217 (for high-temperature applications)
- DIN: 1.7709
- JIS: Based on JIS specifications, though equivalent grades may vary.
Chemical Composition:
| Element | Content (%) |
|---|---|
| C | 0.15-0.21 |
| Mn | 0.40-0.70 |
| P | ≤ 0.03 |
| S | ≤ 0.03 |
| Cr | 2.00-2.50 |
| Mo | 0.90-1.10 |
| V | 0.25-0.35 |
| Si | 0.20-0.35 |
Mechanical Properties:
| Property | Value |
|---|---|
| Tensile strength (MPa) | ≥ 750 |
| Yield strength (MPa) | ≥ 450 |
| Elongation rate (%) | ≥ 18 |
| Section shrinkage (%) | ≥ 45 |
| Impact energy (J) | ≥ 55 |
| Impact toughness (J/cm²) | ≥ 90 |
| Hardness (HB) | ≤ 220 |
25Cr2Mo1V Hardness:
The typical hardness after heat treatment ranges between 350 and 400 HB, depending on the specific hardening and tempering processes.
Heat Treatment:
25Cr2Mo1V steel undergoes heat treatment, followed by tempering to achieve the desired mechanical properties.
Hardening Process:
- 1st Oil Cooling: 920~960℃
- 2nd Oil Cooling: 850~900℃
- Tempering: Performed at 200-300℃ followed by air cooling, optimizing toughness and strength.
Physical Properties:
| Property | Value |
|---|---|
| Modulus of Elasticity (N/mm²) | 205 × 10³ |
| Density (g/cm³) | 7.80 |
| Thermal Conductivity (W/m.K) | 28.0 |
Thermal Properties:
- Thermal conductivity: 28.0 W/m.K at room temperature.
Forging Properties:
Hot forming temperatures range from 1150℃ to 850℃ for forging. After hot working, the material should be cooled in a controlled atmosphere or air.
Stress Relieving:
Stress relief heat treatment is recommended after cold forming or heavy machining to reduce internal stresses. It is performed at 600-700℃ for a controlled cooling process.
Normalizing:
Normalize the steel at 880-920℃ with air cooling, which improves the microstructure and mechanical properties.
Annealing:
Annealing is conducted at 850℃ followed by controlled furnace cooling.
Welding:
25Cr2Mo1V exhibits good weldability, especially with preheating and post-weld heat treatment to minimize the risk of cracking and to maintain mechanical properties.
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.
