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25Si2MnCrNi2MoVA (XGQ25) is a premium ultra-high-strength alloy structural steel developed for critical components subjected to extreme stress, impact, and fatigue conditions.
This grade integrates silicon strengthening, nickel toughness enhancement, and molybdenum hardenability, further refined with vanadium (V) for grain refinement and improved fatigue resistance.
Compared to conventional alloy steels, XGQ25 offers:
Higher tensile strength and yield ratio
Superior resistance to crack initiation and propagation
Stable mechanical performance after heat treatment
It is widely used in aerospace systems, defense equipment, and high-performance engineering structures.
Chemical Composition (wt%)
| Element | Content (%) |
|---|---|
| C | 0.22 – 0.28 |
| Si | 1.50 – 2.00 |
| Mn | 0.80 – 1.20 |
| Cr | 0.90 – 1.30 |
| Ni | 1.50 – 2.00 |
| Mo | 0.30 – 0.50 |
| V | 0.05 – 0.15 |
| 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 |
| Forged Bar | 100 – 1200 mm (3.9" – 47.2") | Custom | GB / ASTM |
| 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: Black / Peeled / Turned / Polished
Mechanical Properties (Typical, Q&T Condition)
| Property | Value |
|---|---|
| Tensile Strength | ≥ 1300 MPa |
| Yield Strength | ≥ 1000 MPa |
| Elongation | ≥ 9% |
| Impact Energy | ≥ 60 J |
| Hardness | 35 – 45 HRC |
Heat Treatment Process
Austenitizing: 850 – 900°C
Quenching: Oil quenching
Tempering: 200 – 600°C
Heat Treatment Benefits:
High strength with controlled toughness
Refined grain structure (due to vanadium addition)
Enhanced fatigue life and wear resistance
Key Features & Advantages
1. Ultra-High Strength Level
Suitable for extreme load-bearing components beyond conventional alloy steels.
2. Enhanced Fatigue Resistance
Vanadium microalloying improves grain refinement and fatigue performance.
3. Excellent Toughness
Nickel ensures impact resistance even at low temperatures.
4. Superior Hardenability
Maintains performance across large cross-sections and heavy forgings.
5. Thermal Stability
Consistent mechanical properties after repeated heat treatment cycles.
Applications
25Si2MnCrNi2MoVA (XGQ25) is widely used in:
Aerospace structural components
Military equipment and armored systems
High-load shafts and transmission systems
Mining and heavy engineering machinery
Offshore and energy equipment
High-performance fasteners and critical parts
Inspection & Quality Assurance
We follow strict quality control systems:
Spectrometer chemical analysis
Mechanical testing (tensile, impact, hardness)
Ultrasonic Testing (UT)
Magnetic Particle Testing (MT)
Microstructure examination
✅ Third-party inspection: SGS / BV / TUV
✅ Certification: EN 10204 3.1 / 3.2
Product Delivery Standards
Delivery Condition: Q&T / Annealed / Normalized
Packaging: Export-standard wooden cases / bundles
Delivery Time: 10–30 days
Supply Capability: Bulk + custom orders
Why Choose Our XGQ25 Steel?
Advanced smelting and refining technology
Strict control of alloy composition
Large forging capability
Rich export experience in ultra-high strength steels
Technical support for engineering applications
Comparison: XGQ25 vs FF710 vs 30CrMnSiA
| Grade | Strength Level | Toughness | Application Level |
|---|---|---|---|
| XGQ25 | ⭐⭐⭐⭐⭐ | ⭐⭐⭐⭐⭐ | Aerospace / Military |
| FF710 | ⭐⭐⭐⭐ | ⭐⭐⭐⭐ | Heavy Equipment |
| 30CrMnSiA | ⭐⭐⭐ | ⭐⭐⭐ | General High Strength |
FAQ – Frequently Asked Questions
Q1: What makes XGQ25 different from FF710?
XGQ25 includes vanadium, offering better grain refinement and fatigue resistance compared to FF710.
Q2: Is XGQ25 suitable for aerospace use?
Yes, due to its high strength-to-weight ratio and fatigue resistance, it is suitable for aerospace-grade components.
Q3: Can it be used for large forgings?
Yes, it has excellent hardenability and structural uniformity in large sections.
Q4: What heat treatment condition is recommended?
Typically quenching and tempering (Q&T) for optimal strength and toughness balance.
Q5: Do you support custom machining?
Yes, we provide cutting, forging, and machining services.
Contact Us
Looking for a reliable 25Si2MnCrNi2MoVA (XGQ25) alloy steel supplier?
We offer:
Custom sizes & forgings
Competitive pricing
Fast global delivery
+8615769214734
office@dongmjd.com
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