Xi'an Dongmeng Group Co., Ltd. is one of the most reliable manufacturers and suppliers of 45crnimov (q45crnimov) alloy steel in China, also supports customized service. With abundant experience, we warmly welcome you to wholesale cheap products in stock here and get free sample from our factory. For price consultation, contact us.
45CrNiMoV (Q45CrNiMoV) is a high-strength low-alloy structural steel strengthened with nickel (Ni), chromium (Cr), molybdenum (Mo), and vanadium (V). It is engineered for critical components operating under high stress, impact loading, and fatigue conditions.
Compared with traditional alloy steels, this grade offers:
Higher strength and toughness balance
Improved fatigue resistance
Enhanced hardenability for large cross-sections
Better resistance to temper embrittlement
Due to these properties, 45CrNiMoV is widely used in aerospace, energy, heavy equipment, and high-end manufacturing industries.
Chemical Composition (wt%)
| Element | Content (%) |
|---|---|
| C | 0.42 – 0.50 |
| Si | 0.17 – 0.37 |
| Mn | 0.50 – 0.80 |
| Cr | 0.80 – 1.20 |
| Ni | 1.30 – 1.80 |
| Mo | 0.20 – 0.40 |
| V | 0.05 – 0.15 |
| P | ≤ 0.025 |
| S | ≤ 0.025 |
Specifications & Dimensions
| Product Type | Size Range | Length | Standard |
|---|---|---|---|
| Round Bar | 20 – 500 mm (0.79" – 19.7") | 3 – 12 m | GB / ASTM |
| Forged Bar | 100 – 1200 mm (3.9" – 47.2") | Custom | GB |
| Steel Plate | 10 – 200 mm (0.39" – 7.87") | Custom | GB |
| Forgings | As per drawings | Custom | EN / ASTM |
Tolerance: ASTM A29 / EN 10060 compliant
Surface Condition: Black / Peeled / Turned / Polished
Mechanical Properties (Typical, Q&T Condition)
| Property | Value |
|---|---|
| Tensile Strength | ≥ 1100 MPa |
| Yield Strength | ≥ 900 MPa |
| Elongation | ≥ 10% |
| Impact Energy | ≥ 60 J |
| Hardness | 32 – 40 HRC |
Heat Treatment Process
Austenitizing: 850 – 880°C
Quenching: Oil quenching
Tempering: 200 – 650°C
Heat Treatment Advantages:
Optimized strength-toughness balance
Reduced risk of brittle fracture
Enhanced fatigue performance
Stable microstructure due to vanadium refinement
Key Features & Advantages
1. High Strength & Load Capacity
Suitable for high-stress and heavy-load engineering applications.
2. Excellent Toughness
Nickel improves low-temperature toughness and impact resistance.
3. Superior Fatigue Resistance
Ideal for cyclic loading environments such as shafts and rotors.
4. Good Hardenability
Ensures uniform mechanical properties in large forgings and thick sections.
5. Resistance to Temper Embrittlement
Mo and V additions enhance long-term reliability.
Applications
45CrNiMoV alloy steel is widely used in:
Aerospace structural components
Power generation rotors and shafts
Heavy-duty gear systems
High-load transmission shafts
Oil & gas equipment
Industrial forging parts
Comparison with Similar Grades
| Grade | Strength | Toughness | Typical Use |
|---|---|---|---|
| 45CrNiMoV | ⭐⭐⭐⭐⭐ | ⭐⭐⭐⭐⭐ | Aerospace / Power Equipment |
| 42CrMo | ⭐⭐⭐ | ⭐⭐⭐ | General Engineering |
| 34CrNiMo6 | ⭐⭐⭐⭐ | ⭐⭐⭐⭐ | Heavy Machinery |
Inspection & Quality Assurance
We ensure strict quality control:
Chemical composition analysis
Mechanical testing (tensile, impact, hardness)
Ultrasonic Testing (UT)
Magnetic Particle Testing (MT)
Microstructure inspection
✅ Third-party inspection: SGS / BV / TUV
✅ Certification: EN 10204 3.1 / 3.2
Product Delivery Standards
Delivery Condition: Q&T / Annealed / Normalized
Packaging: Export-grade wooden cases / bundles
Delivery Time: 10–30 days
Custom machining & forging available
Why Choose Our 45CrNiMoV Steel?
Advanced refining technology (clean steel control)
Stable mechanical properties
Large-size forging capability
Rich export experience
Technical support for engineering design
FAQ – Frequently Asked Questions
Q1: What is 45CrNiMoV steel used for?
It is used for critical high-strength components such as shafts, rotors, and aerospace parts.
Q2: What is the advantage of adding vanadium?
Vanadium refines grain size, improving strength, toughness, and fatigue resistance.
Q3: Is 45CrNiMoV suitable for large forgings?
Yes, it has excellent hardenability and uniform performance in thick sections.
Q4: What heat treatment is recommended?
Quenching and tempering (Q&T) is the standard condition.
Q5: Can you provide customized products?
Yes, we support forging, machining, and custom specifications.
Contact Us
Looking for a reliable 45CrNiMoV (Q45CrNiMoV) alloy steel supplier?
We provide:
Custom sizes & forgings
Fast delivery
Competitive pricing
+8615769214734
office@dongmjd.com
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