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18CrMnNi2MoA is a low-carbon alloy carburizing steel engineered for high-load gear and transmission components. It is designed to achieve a hard, wear-resistant surface after carburizing, while maintaining a tough and impact-resistant core.
The alloy composition provides:
Chromium (Cr): enhances hardenability and wear resistance
Manganese (Mn): improves strength and toughness
Nickel (Ni): increases impact resistance and fatigue life
Molybdenum (Mo): improves strength and prevents temper embrittlement
Compared with standard carburizing steels such as 20CrMnTi, this grade offers:
Deeper case hardening depth
Higher fatigue resistance under heavy loads
Better performance in large gear systems
It is widely used in mining, wind power, heavy machinery, and automotive transmission industries.
Chemical Composition (wt%)
| Element | Content (%) |
|---|---|
| C | 0.15 – 0.22 |
| Si | 0.17 – 0.37 |
| Mn | 0.80 – 1.20 |
| Cr | 0.80 – 1.20 |
| Ni | 1.50 – 2.00 |
| Mo | 0.20 – 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/T 3077 |
| Forged Bar | 80 – 1000 mm (3.15" – 39.4") | Custom | GB |
| Steel Plate | 10 – 200 mm (0.39" – 7.87") | Custom | GB |
| Gear Forgings | As per drawings | Custom | EN / ASTM |
Tolerance: ASTM A29 / EN 10060
Surface Condition: Black / Peeled / Turned / Polished
Mechanical Properties (After Carburizing & Q&T)
| Property | Value |
|---|---|
| Surface Hardness | 58 – 62 HRC |
| Core Tensile Strength | ≥ 900 MPa |
| Core Yield Strength | ≥ 700 MPa |
| Elongation | ≥ 10% |
| Impact Energy | ≥ 55 J |
Heat Treatment Process
Carburizing: 900 – 940°C
Quenching: Oil quenching
Tempering: 150 – 200°C
Heat Treatment Advantages:
Deep and uniform hardened layer
High surface wear resistance
Tough and ductile core
Improved fatigue life
Key Features & Advantages
1. Excellent Carburizing Capability
Ensures deep case depth and uniform hardness distribution.
2. High Hardenability
Maintains performance even in large cross-section components.
3. Superior Fatigue Strength
Ideal for cyclic loading environments such as gears and shafts.
4. High Core Toughness
Nickel improves resistance to impact and crack propagation.
5. Wear Resistance
Suitable for long-term service under friction and heavy load.
Applications
18CrMnNi2MoA alloy steel is widely used in:
Heavy-duty gears and gear shafts
Wind turbine gearboxes
Mining machinery components
Automotive transmission systems
Industrial drive equipment
Comparison with Similar Grades
| Grade | Carburizing Depth | Toughness | Application |
|---|---|---|---|
| 18CrMnNi2MoA | ⭐⭐⭐⭐⭐ | ⭐⭐⭐⭐⭐ | Heavy gears / Wind power |
| 20CrMnTi | ⭐⭐⭐ | ⭐⭐⭐ | General gears |
| 18CrNiMo7-6 | ⭐⭐⭐⭐⭐ | ⭐⭐⭐⭐⭐ | High-end gear systems |
Inspection & Quality Assurance
We apply strict quality control:
Chemical composition analysis
Mechanical property testing
Case depth inspection
Ultrasonic Testing (UT)
Metallographic examination
✅ Third-party inspection: SGS / BV / TUV
✅ Certification: EN 10204 3.1 / 3.2
Product Delivery Standards
Delivery Condition: Annealed / Normalized / Pre-machined
Packaging: Seaworthy export packing
Delivery Time: 10–25 days
Custom forging and machining available
Why Choose Our 18CrMnNi2MoA Steel?
Advanced refining technology
Stable carburizing performance
Large gear forging capability
Export experience to global markets
Technical support for gear design
FAQ – Frequently Asked Questions
Q1: What is 18CrMnNi2MoA steel used for?
It is mainly used for heavy-duty carburized gears and transmission components.
Q2: What is the hardness after carburizing?
Surface hardness can reach 58–62 HRC.
Q3: Is it better than 20CrMnTi?
Yes, it provides better fatigue resistance, deeper case depth, and higher toughness.
Q4: Can you supply gear forgings?
Yes, we provide custom gear blanks and forged components.
Q5: Do you provide inspection certificates?
Yes, we provide EN 10204 3.1 / 3.2 certification.
Contact Us
Looking for a reliable 18CrMnNi2MoA alloy steel supplier?
We offer:
Custom gear forgings
Competitive pricing
Fast global delivery
+8615769214734
office@dongmjd.com
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