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21CrMoVA alloy steel is a high-strength chromium-molybdenum-vanadium (Cr-Mo-V) alloy steel designed for high-temperature, high-pressure, and heavy-load applications. It offers excellent creep resistance, fatigue strength, and thermal stability, making it ideal for critical components such as steam turbine rotors, generator shafts, and heavy forgings.
Compared with conventional Cr-Mo steels, 21CrMoVA provides enhanced mechanical strength and long-term reliability under cyclic thermal stress, making it a preferred material in power generation and heavy engineering industries.
Technical Specifications
➤ Standard
GB/T Alloy Structural Steel
➤ Available Forms
Forged Shaft / Rotor
Round Bar
Heavy Forgings
Custom Machined Parts
Chemical Composition (Typical)
| Element | Content (%) |
|---|---|
| C | 0.17 – 0.24 |
| Cr | 0.90 – 1.20 |
| Mo | 0.25 – 0.35 |
| V | 0.15 – 0.30 |
| Si | ≤ 0.40 |
| Mn | ≤ 0.70 |
| Fe | Balance |
Key Features & Advantages
✅ High Strength & Fatigue Resistance
Suitable for heavy rotating components
✅ Excellent Creep Resistance
Designed for long-term high-temperature service
✅ Good Thermal Stability
Maintains structural integrity under cyclic heating
✅ Strong Hardenability
Deep hardening capability for large forgings
Comparison Guide – 21CrMoVA vs 20CrMo vs 42CrMo
| Property | 21CrMoVA | 20CrMo | 42CrMo |
|---|---|---|---|
| Alloy Type | Cr-Mo-V | Cr-Mo | Cr-Mo |
| Strength | Very High | Medium | High |
| Creep Resistance | Excellent | Moderate | Moderate |
| Application | Turbine / Rotor | Gears | Shafts / Machinery |
| Heat Resistance | High | Medium | Medium |
Key Insight:
21CrMoVA → Best for high-temperature heavy-duty rotating parts
42CrMo → General high-strength machinery
20CrMo → Gear and carburized components
Applications
⚡ Power Generation Industry
Steam turbine rotors
Generator shafts
High-temperature fasteners
🏭 Heavy Machinery
Large forged shafts
Pressure-bearing components
Industrial drive systems
Inspection & Quality Assurance
Chemical Composition Testing
Mechanical Property Testing
Ultrasonic Testing (UT)
Hardness Testing
Impact Testing (Charpy)
Metallographic Analysis
Product Delivery Standards
Heavy-duty export packaging
Anti-rust oil coating
Full traceability with heat number
EN 10204 3.1 / 3.2 certification
FAQ
1. What is 21CrMoVA alloy steel used for?
It is mainly used for steam turbine rotors, generator shafts, and heavy-duty high-temperature components.
2. What are the advantages of 21CrMoVA steel?
High strength
Excellent creep resistance
Good fatigue resistance
Stable performance at elevated temperatures
3. What is the difference between 21CrMoVA and 42CrMo?
21CrMoVA offers better high-temperature and creep resistance, while 42CrMo is used for general mechanical parts.
4. Is 21CrMoVA suitable for high-temperature applications?
Yes. It is specifically designed for long-term service under high temperature and stress conditions.
5. What heat treatment is used for 21CrMoVA?
Typical heat treatment includes:
Quenching
Tempering
to achieve optimal strength and toughness.
6. What role does vanadium play in 21CrMoVA?
Vanadium improves:
Grain refinement
Strength
Creep resistance
7. What forms can 21CrMoVA be supplied in?
Forged shafts
Bars
Heavy forgings
Custom machined components
8. What industries use 21CrMoVA steel?
Power generation
Heavy machinery manufacturing
Petrochemical industry
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