Maraging 250,Vascomax C250 Forgings,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 Forgings (UNS K92940)** --- #### **1. Product Overview** **Vascomax C250 Forgings** (commercially designated as **Maraging 250 Forgings**, **UNS K92940**) are premium-grade forged components manufactured from ultra-high-strength maraging steel through controlled thermomechanical processing. These forgings achieve superior grain structure refinement, enhanced mechanical properties, and optimized directional strength characteristics. The forging process aligns metallic grain flow with component contours, resulting in exceptional strength, improved fatigue resistance, and superior structural integrity for the most demanding aerospace, defense, and energy applications. --- #### **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 - **Fatigue Strength:** Superior high-cycle performance **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. Forging Capabilities & Specifications** **Forging Types Available:** - **Open Die Forgings:** Large, simple shapes - **Closed Die Forgings:** Complex, near-net shapes - **Precision Forgings:** Minimal machining allowance - **Upset Forgings:** Increased cross-sections - **Rolled Ring Forgings:** Circular components **Size Ranges:** - **Weight Range:** 1 kg - 5,000 kg - **Maximum Dimensions:** 6,000 mm length - **Complexity:** High geometry complexity achievable - **Tolerances:** Commercial and precision grades available --- #### **5. Applications** **Aerospace & Defense:** - **Aircraft landing gear** critical structural parts - **Rocket motor cases** and nozzle components - **Missile structural** members and bodies - **Helicopter rotor** hubs and mast components - **Space vehicle** structural components **Energy & Industrial:** - **Oil and gas** drilling tool components - **Nuclear reactor** internal structural parts - **High-performance** racing components - **Heavy machinery** critical load-bearing parts - **Tooling and die** applications requiring high strength **Defense & Military:** - **Armor vehicle** suspension and drive components - **Weapon system** structural members - **Naval vessel** propeller shafts and components - **Military aircraft** critical structural forgings --- #### **6. Standards & Specifications** | Organization | Standard | Description | |---------------|----------------------|-------------------| | **AMS** | AMS 6512 | Steel Bars, Forgings, and Tubing | | **ASTM** | A538 | Standard Specification for Precipitation-Hardening Steel | | **UNS** | K92940 | Unified Numbering System Designation | | **MIL** | MIL-S-46850 | Steel, Maraging 250 Grade | | **Proprietary** | Vascomax C250 | Carpenter Technology Specification | --- #### **7. Manufacturing Process** **Forging Sequence:** 1. **Material Preparation:** Premium VIM-VAR or ESR melted stock 2. **Heating:** Controlled atmosphere forging furnaces 3. **Forging:** Precision controlled deformation processes 4. **Heat Treatment:** Solution treat and age to specified properties 5. **Machining:** Final precision machining capability 6. **Inspection:** Comprehensive quality verification **Heat Treatment Process:** - **Solution Treatment:** 815-830°C (1,500-1,525°F), air cool - **Aging Treatment:** 480-495°C (895-925°F), 3-6 hours - **Cooling:** Air cool to room temperature - **Microstructure:** Fine-grained martensite with optimal precipitation --- #### **8. Quality Assurance** **Testing & Certification:** - **Ultrasonic Testing:** Per AMS 2630/EN 10228 standards - **Chemical Analysis:** Certified ladle and product analysis - **Mechanical Testing:** Tensile and impact tests from prolongations - **Macroetch Testing:** Grain flow and internal soundness verification - **Dimensional Verification:** CMM and optical measurement **Quality Standards:** - **NADCAP Accredited:** Special Process - Forging (AC7108) - **Aerospace Quality:** AS9100 Certified - **Military Compliance:** MIL-STD-1530 requirements - **Traceability:** Full documentation from melt to finished forging --- #### **9. Technical Advantages** **Forging Benefits:** - **Superior Grain Flow:** Enhanced mechanical properties in critical directions - **Improved Integrity:** Elimination of internal voids and porosity - **Better Fatigue Life:** Superior performance under cyclic loading - **Material Efficiency:** Near-net shape capability reduces waste - **Design Flexibility:** Complex geometries with optimized weight **Performance Features:** - **Weight Optimization:** Strategic material placement - **Reliability:** Consistent performance in critical applications - **Damage Tolerance:** Excellent fracture resistance - **Temperature Capability:** Wide operational temperature range - **Corrosion Resistance:** Good environmental performance --- **Design & Engineering Support:** - Custom shapes and sizes available - Design for manufacturability assistance - Prototype development services - Complete manufacturing capability from forging to finished part - Finite element analysis and optimization services **Contact Information:** [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. Forgings are normally supplied rough machined or finished machined to customer requirements. Consult our engineering team for specific application recommendations and design optimization.*

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 2608 gallon liquid totes Special package is available on request.