Maraging 250,Vascomax C250 Bar(Round bar, Flat bar),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 Bar (Round & Flat Bar) UNS K92940** --- #### **1. Product Overview** **Vascomax C250 Bar** (commercially designated as **Maraging 250 Bar**, **UNS K92940**) is supplied in both round bar and flat bar configurations, providing versatile stock material for manufacturing critical components requiring ultra-high strength and excellent toughness. This product combines the superior mechanical properties of Vascomax C250 alloy with the dimensional stability of bar manufacturing, offering optimal solutions for aerospace, defense, and high-performance industrial applications. --- #### **2. Chemical Composition (Weight %)** | Element | Min (%) | Max (%) | Function | |---------|----------|----------|----------| | **Nickel (Ni)** | 18.00 | 19.00 | Matrix strengthening | | **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 | | **Aluminum (Al)** | 0.05 | 0.10 | Secondary age-hardening | | **Carbon (C)** | - | 0.03 | Impurity control | | **Iron (Fe)** | - | - | Balance | --- #### **3. Mechanical & Physical Properties** **A. Mechanical Properties (Aged Condition)** - **Tensile Strength:** 1,793-1,862 MPa (260-270 ksi) - **Yield Strength:** 1,724-1,793 MPa (250-260 ksi) - **Elongation:** 10-12% - **Reduction in Area:** 45-55% - **Hardness:** 50-54 HRC - **Fracture Toughness:** 75-95 MPa√m **B. Physical Properties** - **Density:** 8.00 g/cm³ - **Modulus of Elasticity:** 186 GPa - **Thermal Conductivity:** 20.0-22.0 W/m·K - **Thermal Expansion:** 10.6-11.1 × 10⁻⁶/°C --- #### **4. Product Specifications** **Round Bar:** - **Diameter Range:** 5-300 mm (0.2-12 inches) - **Diameter Tolerance:** h11 standard - **Straightness:** ≤ 1.5 mm/m - **Surface Finish:** Turned, ground, or polished **Flat Bar:** - **Thickness Range:** 5-150 mm (0.2-6 inches) - **Width Range:** 20-300 mm (0.8-12 inches) - **Thickness Tolerance:** ±0.1 to ±0.5 mm - **Squareness:** Maintained within 1° **Available Conditions:** - Annealed (30-34 HRC) - Aged (50-54 HRC) - Solution Treated --- #### **5. Applications** **Round Bar Applications:** - Aircraft landing gear actuators - Rocket motor closures - Precision shafts and spindles - High-strength fasteners - Die-casting machine components **Flat Bar Applications:** - Aircraft structural brackets - Tooling plates and mold bases - Machine frames and fixtures - Defense vehicle structural members - Precision ground stock **Common Applications:** - Injection molding components - Extrusion press components - Helicopter rotor systems - Racing engine components - Optical mounting instruments --- #### **6. Standards & Specifications** | Organization | Standard | Description | |--------------|----------|-------------| | **AMS** | 6512 | Bars, Forgings, and Tubing | | **ASTM** | A538 | Grade 250 | | **UNS** | K92940 | Unified Numbering System | | **MIL** | S-46850 | Maraging Steel Grade 250 | --- #### **7. Heat Treatment Process** **Solution Annealing:** - **Temperature:** 815-830°C (1,500-1,525°F) - **Time:** 1 hour per 25 mm thickness - **Cooling:** Air cool - **Hardness:** 30-34 HRC **Aging Treatment:** - **Temperature:** 480-495°C (895-925°F) - **Time:** 3-6 hours - **Cooling:** Air cool - **Hardness:** 50-54 HRC --- #### **8. Machining & Fabrication** **Machining Guidelines:** - **Optimal Condition:** Annealed state (30-34 HRC) - **Tooling:** Carbide tools recommended - **Coolant:** Required for optimal results - **Threading:** Excellent with proper tooling **Fabrication Advantages:** - Minimal distortion during aging - Good machinability in annealed condition - Excellent weldability with proper procedures - Maintains dimensional stability --- #### **9. Quality Assurance** **Testing & Certification:** - Chemical analysis certification - Mechanical testing from samples - Ultrasonic testing available - Dimensional verification - Full traceability documentation **Quality Standards:** - Aerospace quality (AS9100) - Nadcap accredited - Military compliance - Statistical process control --- **Packaging & Delivery:** - Protective packaging - Clear identification marking - Custom cutting services - Just-in-time delivery available **Contact:** [Your Company Information] *Note: Vascomax is a registered trademark of Carpenter Technology Corporation. All properties typical for aged condition. Consult technical team for specific application requirements.*

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 2601 gallon liquid totes Special package is available on request.