Maraging 250,Vascomax C250 ,UNS K92940,E FORU

British Specs:BS S162，American Specs:AMS 6512 Bar, Tube, Forgings AMS 6520 Sheet, Strip and Plate ASTM A646 MIL-S-46850 Type 3，German Specs:WS 1.6359

### **Technical Data Sheet: Maraging 250 / Vascomax C250 (UNS K92940)** --- #### **1. Product Overview** **Vascomax C250** (commercially known as **Maraging 250**, **UNS K92940**) is a premium-grade ultra-high-strength maraging steel from the Vascomax family of nickel-maraging steels. This alloy represents one of the highest strength grades in the Vascomax series, offering an exceptional combination of strength, toughness, and dimensional stability. The "C250" designation indicates its nominal yield strength of 250 ksi (1,724 MPa) in the fully aged condition. --- #### **2. Chemical Composition (Weight %)** | Element | Min (%) | Max (%) | Function | |---------|----------|----------|----------| | **Nickel (Ni)** | 18.00 | 19.00 | Matrix strengthening, toughness | | **Cobalt (Co)** | 7.00 | 7.50 | Solid solution strengthening | | **Molybdenum (Mo)** | 4.60 | 5.10 | Precipitation hardening | | **Titanium (Ti)** | 0.40 | 0.50 | Primary age-hardening element | | **Aluminum (Al)** | 0.05 | 0.10 | Secondary age-hardening element | | **Carbon (C)** | - | 0.03 | Impurity control | | **Manganese (Mn)** | - | 0.10 | - | | **Silicon (Si)** | - | 0.10 | - | | **Iron (Fe)** | - | - | Balance | --- #### **3. Mechanical & Physical Properties** **A. Mechanical Properties (Aged Condition)** - **Tensile Strength:** 1,793-1,862 MPa (260-270 ksi) - **Yield Strength (0.2% Offset):** 1,724-1,793 MPa (250-260 ksi) - **Elongation:** 10-12% - **Reduction in Area:** 45-55% - **Hardness:** 50-54 HRC - **Fracture Toughness (K_Ic):** 75-95 MPa√m - **Impact Strength (Charpy V):** 20-30 J **B. Physical Properties** - **Density:** 8.00 g/cm³ (0.289 lb/in³) - **Modulus of Elasticity:** 186 GPa (27.0 × 10⁶ psi) - **Poisson's Ratio:** 0.30 - **Thermal Conductivity:** 20.0-22.0 W/m·K - **Thermal Expansion Coefficient:** 10.6-11.1 × 10⁻⁶/°C (20-100°C) - **Electrical Resistivity:** 0.58-0.63 μΩ·m --- #### **4. Product Forms & Applications** **Available Product Forms:** - Bar (Round, Flat, Square) - Plate and Sheet - Wire and Rod - Forgings - Tubular products **Aerospace Applications:** - Aircraft landing gear components - Rocket motor cases - Missile structures - Helicopter rotor components - Space vehicle structural members **Defense Applications:** - Armor components - Weapon system parts - Military vehicle components - Ordnance applications **Industrial Applications:** - High-performance tooling - Die-casting components - Extrusion press rams - High-strength fasteners --- #### **5. Standards & Specifications** | Organization | Standard | Description | |--------------|----------|-------------| | **AMS** | 6512 | Steel Bars, Forgings, and Tubing | | **ASTM** | A538 | Grade 250 | | **UNS** | K92940 | Unified Numbering System | | **MIL** | S-46850 | Maraging Steel Grade 250 | | **Proprietary** | Vascomax C250 | Carpenter Technology Specification | --- #### **6. Heat Treatment Process** **Solution Annealing:** - **Temperature:** 815-830°C (1,500-1,525°F) - **Time:** 1 hour per 25 mm of thickness - **Cooling:** Air cool - **Resulting Hardness:** 30-34 HRC **Aging Treatment:** - **Temperature:** 480-495°C (895-925°F) - **Time:** 3-6 hours - **Cooling:** Air cool - **Final Hardness:** 50-54 HRC **Key Advantages:** - Minimal distortion during aging - No quenching required - Excellent dimensional stability - Simple furnace equipment requirements --- #### **7. Fabrication Characteristics** **Machining:** - **Annealed Condition:** Good machinability (30-34 HRC) - **Tooling:** Carbide tools recommended - **Coolant:** Required for optimal results - **Aged Condition:** Grinding or EDM preferred **Welding:** - **Weldability:** Good with proper procedures - **Processes:** TIG, MIG, Plasma Arc - **Filler Metal:** Matching composition recommended - **Pre/Post Treatment:** Solution anneal after welding --- #### **8. Quality Assurance** **Testing & Certification:** - **Chemical Analysis:** Certified ladle and product analysis - **Mechanical Testing:** Tensile and impact tests - **Non-Destructive Testing:** Ultrasonic, dye penetrant - **Microstructural Analysis:** Grain structure evaluation - **Certification:** Full traceability documentation **Quality Standards:** - **Aerospace Quality:** AS9100 - **Nadcap Accredited:** Heat Treatment, NDT - **Military Compliance:** MIL-STD requirements --- #### **9. Technical Advantages** **Performance Benefits:** - **Ultra-High Strength:** Exceptional strength-to-weight ratio - **Excellent Toughness:** Superior fracture resistance - **Dimensional Stability:** Minimal size changes during aging - **Corrosion Resistance:** Good environmental performance - **Fatigue Strength:** Excellent high-cycle performance **Comparative Advantages:** - Superior to conventional high-strength steels - Better toughness than most ultra-high-strength alloys - Simpler heat treatment than quenched and tempered steels - Proven reliability in critical applications --- **Ordering Information:** - Available in standard and custom sizes - Full certification package provided - Technical support available - Global distribution network **Contact:** [Your Company Information] *Note: Vascomax C250 is a registered trademark of Carpenter Technology Corporation. All mechanical properties are typical for material in the fully aged condition. Consult technical data sheets for specific application recommendations and processing guidelines.*

Packing of Standard Packing: Typical bulk packaging includes palletized plastic 5 gallon/25 kg. pails, fiber and steel drums to 1 ton super sacks in full container (FCL) or truck load (T/L) quantities. Research and sample quantities and hygroscopic, oxidizing or other air sensitive materials may be packaged under argon or vacuum. Solutions are packaged in polypropylene, plastic or glass jars up to palletized 2599 gallon liquid totes Special package is available on request.