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40SiMnCrNi2MoV is a low-carbon ultra-high-strength alloy steel engineered for critical heavy-load components. Its multi-alloy system, including silicon (Si), manganese (Mn), chromium (Cr), nickel (Ni), molybdenum (Mo), and vanadium (V), delivers:
Exceptional strength-to-weight ratio
Superior impact toughness and crack resistance
Excellent fatigue and wear resistance
Stable mechanical properties after heat treatment
It is widely used in aerospace components, large industrial shafts, heavy-duty gears, and machinery subjected to extreme loads.
Compared with standard medium-alloy steels like 42CrMo, 40SiMnCrNi2MoV offers:
Higher tensile and yield strength
Improved low-temperature toughness
Enhanced structural reliability under cyclic load
Chemical Composition (wt%)
| Element | Content (%) |
|---|---|
| C | 0.37 – 0.45 |
| Si | 0.17 – 0.37 |
| Mn | 0.80 – 1.20 |
| Cr | 0.90 – 1.30 |
| Ni | 1.20 – 1.60 |
| Mo | 0.15 – 0.30 |
| V | 0.05 – 0.12 |
| 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 / EN |
| Forged Bar | 80 – 1200 mm (3.15" – 47.2") | Custom | GB / EN |
| Shafts / Gear Blanks | As per drawings | Custom | GB / EN |
| Steel Plate | 10 – 200 mm (0.39" – 7.87") | Custom | GB |
Tolerance: ASTM A29 / EN 10060
Surface Condition: Black / Peeled / Turned / Polished
Mechanical Properties (Typical, Q&T Condition)
| Property | Value |
|---|---|
| Tensile Strength | ≥ 1400 MPa |
| Yield Strength | ≥ 1100 MPa |
| Elongation | ≥ 9% |
| Impact Energy | ≥ 60 J |
| Hardness | 36 – 45 HRC |
Heat Treatment Process
Austenitizing: 850 – 900°C
Quenching: Oil or Gas quenching
Tempering: 200 – 600°C
Heat Treatment Benefits:
Refined grain structure
High strength with controlled toughness
Enhanced fatigue and wear resistance
Stable properties in large sections
Key Features & Advantages
Ultra-High Strength – Designed for extreme structural loads.
Excellent Toughness – Nickel and vanadium improve impact resistance.
Superior Fatigue Resistance – Ideal for cyclic stress components.
Wear Resistance – Long-lasting performance under heavy loads.
Stable Heat Treatment – Uniform properties in large forgings.
Applications
Aerospace structural shafts
Heavy-duty gears and gear shafts
Industrial machinery components
Large forgings for mining and power equipment
High-load transmission shafts
Comparison with Similar Grades
| Grade | Strength | Toughness | Application |
|---|---|---|---|
| 40SiMnCrNi2MoV | ⭐⭐⭐⭐⭐ | ⭐⭐⭐⭐⭐ | Aerospace & heavy-duty gears/shafts |
| 42CrMo | ⭐⭐⭐⭐ | ⭐⭐⭐⭐ | General industrial shafts |
| 35CrMo | ⭐⭐⭐ | ⭐⭐⭐ | Medium-duty shafts and gears |
Inspection & Quality Assurance
Chemical composition analysis
Mechanical property testing
Ultrasonic Testing (UT)
Magnetic Particle Testing (MT)
Metallographic examination
✅ 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 seaworthy packing
Delivery Time: 10–30 days
Custom machining and large forging capability available
FAQ – Frequently Asked Questions
Q1: What is 40SiMnCrNi2MoV used for?
A1: Ultra-high-strength shafts, heavy-duty gears, and critical structural components.
Q2: What is its tensile strength?
A2: Typically ≥ 1400 MPa after Q&T treatment.
Q3: Can it withstand low temperatures?
A3: Yes, thanks to nickel content, it has excellent low-temperature toughness.
Q4: Do you provide custom forgings?
A4: Yes, large shafts, gear blanks, and forgings are available.
Q5: Are inspection certificates provided?
A5: Yes, EN 10204 3.1 / 3.2 certificates are available.
Contact Us
Looking for a reliable 40SiMnCrNi2MoV alloy steel supplier?
Custom sizes & large forgings
Competitive pricing
Fast global delivery
+8615769214734
office@dongmjd.com
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