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20MnCr1Ni1Mo is a low-carbon Ni-Cr-Mo alloy carburizing steel designed for high-load gears and shafts. It forms a hard, wear-resistant surface after carburizing while maintaining a tough, ductile core, ensuring high reliability in heavy-duty transmission systems.
Key Alloying Elements:
Manganese (Mn): increases strength and toughness
Chromium (Cr): improves hardenability and wear resistance
Nickel (Ni): enhances impact resistance and core toughness
Molybdenum (Mo): increases strength and reduces temper brittleness
Compared to standard carburizing steels like 20CrMnTi, 20MnCr1Ni1Mo offers:
Deeper case hardening depth
Better fatigue resistance under cyclic loading
Improved performance in larger diameter gears and heavy shafts
Applications include automotive transmissions, industrial machinery, and heavy-duty gear systems.
Chemical Composition (wt%)
| Element | Content (%) |
|---|---|
| C | 0.17 – 0.23 |
| Si | 0.17 – 0.37 |
| Mn | 0.80 – 1.10 |
| Cr | 0.80 – 1.10 |
| Ni | 0.30 – 0.60 |
| Mo | 0.15 – 0.25 |
| 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
arburizing: 900 – 940°C
Quenching: Oil quenching
Tempering: 150 – 200°C
Benefits:
Deep, uniform hardened surface
Tough and ductile core
High fatigue life for gear components
Long-lasting wear resistance
Key Features & Advantages
Excellent Carburizing Performance – Deep and uniform hardened layer.
High Core Toughness – Nickel improves impact resistance.
Superior Fatigue Strength – Ideal for cyclic loading applications.
Wear Resistance – Durable surface for long-term use.
Stable Heat Treatment – Uniform properties in thick sections.
Applications
Heavy-duty gears and shafts
Automotive transmission systems
Industrial gearboxes
Mining machinery components
High-load power transmission equipment
Comparison with Similar Grades
| Grade | Carburizing Depth | Toughness | Application |
|---|---|---|---|
| 20MnCr1Ni1Mo | ⭐⭐⭐⭐⭐ | ⭐⭐⭐⭐⭐ | Heavy-duty gears & shafts |
| 20CrMnTi | ⭐⭐⭐ | ⭐⭐⭐ | General gears |
| 18CrNiMo7-6 | ⭐⭐⭐⭐⭐ | ⭐⭐⭐⭐ | High-end gear systems |
Inspection & Quality Assurance
Chemical composition analysis
Mechanical testing (tensile, impact, hardness)
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 forgings & machining available
FAQ – Frequently Asked Questions
Q1: What is 20MnCr1Ni1Mo steel used for?
A1: Heavy-duty gears, shafts, and transmission components.
Q2: What is the surface hardness after carburizing?
A2: 58–62 HRC, with a tough core.
Q3: Is it better than 20CrMnTi?
A3: Yes, it offers deeper case depth, higher fatigue resistance, and improved toughness.
Q4: Can you supply custom gear forgings?
A4: Yes, gear blanks and forged shafts are available.
Q5: Are inspection certificates provided?
A5: Yes, EN 10204 3.1 / 3.2 certificates are provided.
Contact Us
Looking for a reliable 20MnCr1Ni1Mo alloy steel supplier?
Custom sizes & gear forgings
Competitive pricing
Fast global delivery
+8615769214734
office@dongmjd.com
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