Maraging 250,Vascomax C250 Rod,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 Rod (UNS K92940)** --- #### **1. Product Overview** **Vascomax C250 Rod** (commercially designated as **Maraging 250 Rod**, **UNS K92940**) is a premium-grade round bar product manufactured from ultra-high-strength maraging steel. This rod product maintains the exceptional mechanical properties of the Vascomax C250 alloy system while providing ideal stock material for machining critical components in aerospace, defense, and tooling applications. The rod form offers excellent machinability in the annealed condition and develops ultra-high strength after proper aging treatment. --- #### **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 | | **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) --- #### **4. Product Specifications** **Rod Dimensions:** - **Diameter Range:** 5 mm - 300 mm (0.2" - 12") - **Standard Lengths:** 3,000 mm & 4,000 mm (10' & 13') - **Diameter Tolerance:** h11 for standard precision - **Straightness:** ≤ 1.5 mm/m - **Surface Finish:** Turned, ground, or polished available **Available Conditions:** - **Annealed:** 30-34 HRC (for machining) - **Aged:** 50-54 HRC (full strength) - **Solution Treated:** Ready for aging after machining --- #### **5. Applications** **Aerospace & Defense:** - Aircraft landing gear components - Rocket motor case segments - Missile body sections - Helicopter rotor shafts - Ordnance components **Tooling & Manufacturing:** - Precision mold bases and inserts - Die-casting cores and pins - Extrusion press components - Injection molding screws - High-strength fixtures **High-Performance Industrial:** - Racing engine components - High-strength fasteners - Hydraulic cylinder rods - Test equipment shafts - Optical mounting systems --- #### **6. 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 | --- #### **7. Heat Treatment Process** **Solution Annealing (Before Machining):** - **Temperature:** 815-830°C (1,500-1,525°F) - **Time:** 1 hour per 25 mm of diameter - **Cooling:** Air cool - **Resulting Hardness:** 30-34 HRC **Aging Treatment (After Machining):** - **Temperature:** 480-495°C (895-925°F) - **Time:** 3-6 hours depending on diameter - **Cooling:** Air cool - **Final Hardness:** 50-54 HRC --- #### **8. Machining & Fabrication** **Machining Guidelines:** - **Optimal Condition:** Machine in annealed condition (30-34 HRC) - **Tooling:** Carbide tools with positive rake angles - **Speeds & Feeds:** Moderate to high speeds with coolant - **Threading:** Excellent results with proper tool geometry **Finishing Operations:** - **Grinding:** Suitable for final dimensional adjustment - **EDM:** Excellent for complex geometries - **Polishing:** Achieves mirror finishes - **Coating:** Various surface treatments compatible --- #### **9. Quality Assurance** **Testing & Certification:** - **Chemical Analysis:** Certified ladle and product analysis - **Mechanical Testing:** Tensile and impact tests - **Ultrasonic Testing:** Available for critical applications - **Macroetch Testing:** Internal soundness verification - **Certification:** EN 10204 3.1/3.2 material certificates **Quality Features:** - **Traceability:** Full melt history and processing records - **Surface Quality:** Free from seams and harmful defects - **Dimensional Control:** Certified to specified tolerances - **Batch Consistency:** Statistical process control maintained --- **Packaging & Handling:** - Protective end caps to prevent damage - Individual wrapping or wooden crating - Clear identification and heat number marking - Custom cutting services available **Contact:** [Your Company Information] *Note: Vascomax is a registered trademark of Carpenter Technology Corporation. All mechanical properties are typical for material in the fully aged condition. Properties may vary based on specific diameter and heat treatment parameters. Consult our technical team for application-specific recommendations.*

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 2600 gallon liquid totes Special package is available on request.