Xi'an Dongmeng Group Co., Ltd. is one of the most reliable manufacturers and suppliers of 24crni4mo 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.
24CrNi4Mo is a medium-carbon Ni-Cr-Mo alloy structural steel widely used in applications requiring high strength, deep hardenability, and excellent toughness.
With optimized alloying elements:
Nickel (Ni) improves toughness and impact resistance
Chromium (Cr) enhances wear resistance and hardenability
Molybdenum (Mo) increases strength and reduces temper embrittlement
Compared with conventional steels such as 42CrMo, 24CrNi4Mo provides:
Better performance in large-section components
Higher fatigue strength
Improved structural reliability under heavy loads
It is a preferred material for critical transmission components and heavy-duty engineering systems.
Chemical Composition (wt%)
| Element | Content (%) |
|---|---|
| C | 0.20 – 0.28 |
| Si | 0.17 – 0.37 |
| Mn | 0.50 – 0.80 |
| Cr | 0.90 – 1.30 |
| Ni | 3.25 – 3.75 |
| Mo | 0.25 – 0.40 |
| 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 | ≥ 980 MPa |
| Yield Strength | ≥ 785 MPa |
| Elongation | ≥ 10% |
| Impact Energy | ≥ 55 J |
| Hardness | 28 – 36 HRC |
Heat Treatment Process
Austenitizing: 850 – 880°C
Quenching: Oil quenching
Tempering: 200 – 650°C
Heat Treatment Advantages:
Deep and uniform hardening
High core toughness
Resistance to temper brittleness
Improved fatigue performance
Key Features & Advantages
1. Excellent Hardenability
Suitable for large-section forgings with consistent properties throughout.
2. High Toughness
Nickel-rich composition ensures strong impact resistance, even at low temperatures.
3. Superior Fatigue Strength
Ideal for dynamic load applications such as rotating shafts and gears.
4. Good Wear Resistance
Chromium enhances surface durability under friction.
5. Reliable Performance in Heavy Conditions
Maintains stability in high-load, high-stress industrial environments
Applications
24CrNi4Mo alloy steel is widely used in:
Heavy-duty gear systems
Wind power shafts and main shafts
Mining machinery components
Automotive transmission parts
Oil & gas drilling equipment
Industrial forged components
Comparison with Similar Grades
| Grade | Hardenability | Toughness | Typical Use |
|---|---|---|---|
| 24CrNi4Mo | ⭐⭐⭐⭐⭐ | ⭐⭐⭐⭐⭐ | Heavy-duty / Wind Power |
| 42CrMo | ⭐⭐⭐ | ⭐⭐⭐ | General Engineering |
| 34CrNiMo6 | ⭐⭐⭐⭐ | ⭐⭐⭐⭐ | High-strength Components |
Inspection & Quality Assurance
We ensure strict quality control:
Chemical composition testing
Mechanical property testing
Ultrasonic Testing (UT)
Magnetic Particle Testing (MT)
Metallographic analysis
✅ Third-party inspection: SGS / BV / TUV
✅ Certification: EN 10204 3.1 / 3.2
Product Delivery Standards
Delivery Condition: Q&T / Annealed / Normalized
Packaging: Seaworthy export packing
Delivery Time: 10–30 days
Custom machining and forging available
Why Choose Our 24CrNi4Mo Steel?
Advanced smelting and refining process
Strict quality control system
Large forging capacity
Global export experience
Engineering support and material selection guidance
FAQ – Frequently Asked Questions
Q1: What is 24CrNi4Mo steel used for?
It is used for high-load gears, shafts, and heavy-duty mechanical components.
Q2: What is the equivalent grade of 24CrNi4Mo?
It is similar to EN 34CrNiMo6 / 30CrNiMo8, depending on standard variations.
Q3: Is it suitable for large forgings?
Yes, it has excellent deep hardenability and uniform mechanical properties.
Q4: What heat treatment is recommended?
Quenching and tempering (Q&T) is the standard condition.
Q5: Can you provide customized sizes?
Yes, we support custom forging, cutting, and machining services.
Contact Us
Looking for a reliable 24CrNi4Mo alloy steel supplier?
We offer:
Custom sizes & forgings
Competitive pricing
Fast global delivery
+8615769214734
office@dongmjd.com
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