Xi'an Dongmeng Group Co., Ltd. is one of the most reliable manufacturers and suppliers of 15mnni4moa (sn2025) 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.
15MnNi4MoA (SN2025) is a low-carbon Mn-Ni-Mo alloy structural steel developed for heavy-section components requiring high toughness and reliable performance under pressure and low-temperature conditions.
The alloy system provides:
Manganese (Mn): improves strength and hardenability
Nickel (Ni): enhances toughness and low-temperature impact resistance
Molybdenum (Mo): increases strength and reduces temper embrittlement
Compared with conventional carbon steels, SN2025 offers:
Superior low-temperature toughness
Better weldability for large structures
Improved structural integrity in thick sections
It is widely used in pressure vessels, offshore engineering, and power generation equipment.
Chemical Composition (wt%)
| Element | Content (%) |
|---|---|
| C | 0.12 – 0.18 |
| Si | 0.17 – 0.37 |
| Mn | 1.20 – 1.60 |
| Ni | 0.80 – 1.20 |
| Mo | 0.20 – 0.40 |
| P | ≤ 0.025 |
| S | ≤ 0.025 |
Specifications & Dimensions
| Product Type | Size Range | Length | Standard |
|---|---|---|---|
| Steel Plate | 10 – 300 mm (0.39" – 11.8") | Up to 12 m | GB / EN |
| Forged Bar | 100 – 1200 mm (3.9" – 47.2") | Custom | GB |
| Heavy Forgings | Up to large tonnage | As per drawing | ASTM / EN |
Tolerance: ASTM A20 / EN 10029
Surface Condition: As-rolled / Normalized / Machined
Mechanical Properties (Typical, Normalized / Q&T)
| Property | Value |
|---|---|
| Tensile Strength | ≥ 600 – 850 MPa |
| Yield Strength | ≥ 400 – 650 MPa |
| Elongation | ≥ 16% |
| Impact Energy (Low Temp) | ≥ 80 J |
| Hardness | 180 – 260 HB |
Heat Treatment Process
Normalizing: 880 – 920°C
Quenching (optional): 860 – 900°C
Tempering: 550 – 650°C
Heat Treatment Benefits:
Improved toughness and ductility
Refined grain structure
Enhanced performance in thick sections
Key Features & Advantages
1. Excellent Low-Temperature Toughness
Suitable for cold environments and pressure applications.
2. Good Weldability
Low carbon content allows easy welding with reduced cracking risk.
3. High Structural Reliability
Ideal for large forgings and thick plates.
4. Balanced Strength & Toughness
Provides safe performance under pressure and load conditions.
5. Resistance to Temper Embrittlement
Mo addition enhances long-term stability.
Applications
15MnNi4MoA (SN2025) alloy steel is widely used in:
Pressure vessels and boilers
Nuclear and thermal power equipment
Offshore platforms and structures
Heavy engineering forgings
Chemical processing equipment
Comparison with Similar Grades
| Grade | Strength | Toughness | Application |
|---|---|---|---|
| 15MnNi4MoA | ⭐⭐⭐⭐ | ⭐⭐⭐⭐⭐ | Pressure vessels / Offshore |
| 16Mn (Q345) | ⭐⭐⭐ | ⭐⭐⭐ | General structures |
| 18NiMo7-6 | ⭐⭐⭐⭐⭐ | ⭐⭐⭐⭐ | High-end gears |
Inspection & Quality Assurance
We follow strict inspection procedures:
Chemical composition analysis
Mechanical testing (tensile, impact, hardness)
Ultrasonic Testing (UT) for internal defects
Radiographic Testing (RT) (optional)
Metallographic examination
✅ Third-party inspection: SGS / BV / TUV
✅ Certification: EN 10204 3.1 / 3.2
Product Delivery Standards
Delivery Condition: Normalized / Q&T / As-rolled
Packaging: Seaworthy export packing
Delivery Time: 15–35 days
Custom fabrication available
Why Choose Our SN2025 Steel?
Stable low-alloy composition control
Strong capability in heavy forgings
Excellent performance in low-temperature environments
Global project supply experience
Engineering support and welding guidance
FAQ – Frequently Asked Questions
Q1: What is SN2025 steel used for?
It is mainly used for pressure vessels, offshore structures, and heavy forgings.
Q2: Is it suitable for low-temperature service?
Yes, it has excellent low-temperature impact toughness.
Q3: Can it be welded easily?
Yes, due to its low carbon content, it has good weldability.
Q4: What heat treatment is recommended?
Normalizing or quenching & tempering depending on application requirements.
Q5: Do you provide large-size forgings?
Yes, we supply custom heavy forgings and thick plates.
Contact Us
Looking for a reliable 15MnNi4MoA (SN2025) alloy steel supplier?
We offer:
Custom heavy forgings
Competitive pricing
Fast global delivery
+8615769214734
office@dongmjd.com
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