Maraging 250,Vascomax C250 Foil,Shim,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 Foil & Shim (UNS K92940)** --- #### **1. Product Overview** **Vascomax C250 Foil & Shim** (commercially designated as **Maraging 250 Foil & Shim**, **UNS K92940**) are precision thin-gauge products manufactured from ultra-high-strength maraging steel. These products maintain the exceptional mechanical properties of Vascomax C250 alloy in extremely thin cross-sections, providing ideal solutions for applications requiring high strength, dimensional stability, and precise thickness control in weight-critical aerospace, defense, and precision engineering 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:** 8-12% - **Hardness:** 50-54 HRC - **Fatigue Strength:** Excellent in thin-section applications - **Spring Properties:** Superior resilience and durability **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** **Foil Specifications:** - **Thickness Range:** 0.025-0.50 mm (0.001-0.020 inches) - **Width Range:** 50-300 mm (2-12 inches) - **Standard Length:** Coils up to 1000 meters - **Thickness Tolerance:** ±0.0025 mm (precision grade) - **Surface Finish:** Bright annealed or matte finish **Shim Specifications:** - **Thickness Range:** 0.50-3.00 mm (0.020-0.118 inches) - **Width Range:** 100-600 mm (4-24 inches) - **Standard Forms:** Sheets, strips, custom blanks - **Thickness Tolerance:** ±0.005 mm (precision grade) - **Surface Finish:** Ground or cold-rolled finish --- #### **5. Applications** **Aerospace & Aviation:** - Aircraft structural shims and spacers - Control surface gap management foils - Engine mounting precision shims - Avionics equipment mounting shims - Satellite component precision spacers **Defense & Military:** - Weapon system precision shims - Armor system spacing components - Military optical system shims - Guidance system foil components - Electronic enclosure shielding foils **Precision Engineering:** - High-performance spring foils - Instrumentation precision shims - Bearing pre-load spacers - Optical mounting shims - Laboratory equipment precision components --- #### **6. Standards & Specifications** | Organization | Standard | Description | |--------------|----------|-------------| | **AMS** | 6512 | Steel Bars, Forgings, and Tubing | | **ASTM** | A538 | Grade 250 | | **ASTM** | A693 | Precipitation-Hardening Steel Plate | | **UNS** | K92940 | Unified Numbering System | --- #### **7. Heat Treatment Process** **Solution Annealing:** - **Temperature:** 815-830°C (1,500-1,525°F) - **Time:** 15-30 minutes - **Cooling:** Controlled air cool - **Hardness:** 30-34 HRC **Aging Treatment:** - **Temperature:** 480-495°C (895-925°F) - **Time:** 1-3 hours - **Cooling:** Air cool - **Hardness:** 50-54 HRC --- #### **8. Fabrication & Processing** **Forming Characteristics:** - **Bend Radius:** Minimum 1x material thickness (foil) - **Stamping:** Excellent in annealed condition - **Punching:** Clean edges with proper tooling - **Flatness:** Excellent dimensional stability **Surface Treatment Options:** - Passivation per AMS-QQ-P-35 - Various plating options available - Special functional coatings - Mirror finishes achievable --- #### **9. Quality Assurance** **Testing & Certification:** - Dimensional verification with laser micrometer - 100% visual surface inspection - Thickness mapping with continuous scanning - Mechanical testing from sample lots - Full material traceability **Special Quality Features:** - Burr-free edges for precision applications - Controlled surface roughness - Consistent flatness maintenance - Clean manufacturing environment --- **Packaging & Handling:** - Protective interleaving between layers - Moisture-resistant wrapping - Static-dissipative packaging for electronic applications - Custom slitting and blanking services **Contact:** [Your Company Information] *Note: Vascomax is a registered trademark of Carpenter Technology Corporation. Foil and shim products are normally supplied in annealed condition for forming operations. Final aging treatment should be performed after all fabrication processes. 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 2610 gallon liquid totes Special package is available on request.