Xi'an Dongmeng Group Co., Ltd. is one of the most reliable manufacturers and suppliers of 15crnimoa (ex30) 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.
15CrNiMoA (EX30) is a low-carbon alloy carburizing steel widely used in high-performance transmission systems. It is designed to achieve a hard, wear-resistant surface after carburizing, while maintaining a tough and ductile core.
The combination of alloying elements:
Chromium (Cr): improves hardenability and wear resistance
Nickel (Ni): enhances toughness and impact resistance
Molybdenum (Mo): increases strength and prevents temper embrittlement
Compared with conventional carburizing steels like 20CrMnTi, 15CrNiMoA provides:
Better fatigue resistance under heavy load
Deeper carburized case depth
Improved impact performance in large gears
It is widely used in automotive, mining, and heavy-duty industrial gear systems.
Chemical Composition (wt%)
| Element | Content (%) |
|---|---|
| C | 0.12 – 0.18 |
| Si | 0.17 – 0.37 |
| Mn | 0.40 – 0.70 |
| Cr | 0.80 – 1.10 |
| Ni | 1.30 – 1.70 |
| Mo | 0.15 – 0.30 |
| 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 Benefits:
Hard wear-resistant surface layer
Tough core to absorb impact
Improved fatigue life for gear components
Key Features & Advantages
1. Excellent Carburizing Performance
Achieves deep and uniform hardened layer, ideal for heavy-duty gears.
2. High Core Toughness
Nickel ensures impact resistance and crack prevention.
3. Superior Fatigue Strength
Suitable for cyclic loading and high-speed transmission systems.
4. Wear Resistance
Carburized surface significantly improves abrasion resistance.
5. Stable Heat Treatment Performance
Consistent properties across large-section components.
Applications
15CrNiMoA (EX30) alloy steel is widely used in:
Heavy-duty gears and gear shafts
Automotive transmission systems
Mining and construction machinery
Wind power gearboxes
Industrial drive systems
Comparison with Similar Grades
| Grade | Carburizing Ability | Toughness | Application |
|---|---|---|---|
| 15CrNiMoA | ⭐⭐⭐⭐⭐ | ⭐⭐⭐⭐⭐ | Heavy-duty gears |
| 20CrMnTi | ⭐⭐⭐ | ⭐⭐⭐ | General gears |
| 18CrNiMo7-6 | ⭐⭐⭐⭐⭐ | ⭐⭐⭐⭐⭐ | High-end gear systems |
Inspection & Quality Assurance
We implement comprehensive quality control:
Chemical composition analysis
Mechanical property testing
Case depth inspection after carburizing
Ultrasonic Testing (UT)
Metallographic analysis
✅ Third-party inspection: SGS / BV / TUV
✅ Certification: EN 10204 3.1 / 3.2
Product Delivery Standards
Delivery Condition: Annealed / Normalized / Pre-machined
Packaging: Export-standard seaworthy packing
Delivery Time: 10–25 days
Custom forging & machining services available
Why Choose Our 15CrNiMoA (EX30) Steel?
Stable carburizing performance
Advanced refining technology
Large-size gear forging capability
Global export experience
Technical support for gear design
FAQ – Frequently Asked Questions
Q1: What is 15CrNiMoA (EX30) used for?
It is mainly used for high-load carburized gears and transmission components.
Q2: What is the hardness after carburizing?
Surface hardness can reach 58–62 HRC, with a tough core.
Q3: Is it better than 20CrMnTi?
Yes, it offers better toughness, deeper case depth, and higher fatigue strength.
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 15CrNiMoA (EX30) alloy steel supplier?
We provide:
Custom sizes & gear forgings
Competitive pricing
Fast global delivery
+8615769214734
office@dongmjd.com
Hot Tags: 15crnimoa (ex30) alloy steel, China 15crnimoa (ex30) alloy steel manufacturers, suppliers, factory
