Maraging 250,Udimar 250 Foil,Shim,,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

### **Product Datasheet: Maraging Steel 250 / Udimar 250 Foil & Shim** --- #### **1. Product Overview** **Maraging Steel 250 Foil & Shim** (commercially known as **Udimar 250 Foil & Shim**) are precision-engineered thin-gauge products manufactured from ultra-high-strength maraging steel. These products maintain the exceptional mechanical properties of Maraging 250 alloy in extremely thin cross-sections, providing solutions for applications requiring high strength, dimensional stability, and precise thickness control. The foil and shim products are ideal for weight-critical aerospace, precision instrumentation, and high-reliability defense applications where space constraints and performance are paramount. --- #### **2. Chemical Composition (Weight %)** | Element | Min (%) | Max (%) | Balance | |---------|----------|----------|---------| | **Nickel (Ni)** | 17.00 | 19.00 | - | | **Cobalt (Co)** | 7.00 | 8.50 | - | | **Molybdenum (Mo)** | 4.50 | 5.20 | - | | **Titanium (Ti)** | 0.30 | 0.50 | - | | **Aluminum (Al)** | 0.05 | 0.15 | - | | **Iron (Fe)** | - | - | Balance | | **Carbon (C)** | - | 0.03 | - | | **Manganese (Mn)** | - | 0.10 | - | | **Silicon (Si)** | - | 0.10 | - | | **Sulfur (S)** | - | 0.01 | - | | **Phosphorus (P)** | - | 0.01 | - | --- #### **3. Physical & Mechanical Properties** **A. Mechanical Properties (After Solution Annealing & Aging)** - **Tensile Strength:** 1,720 - 1,790 MPa (250 - 260 ksi) - **Yield Strength (0.2% Offset):** 1,655 - 1,725 MPa (240 - 250 ksi) - **Elongation:** 8 - 12% - **Hardness:** 48 - 52 HRC - **Fatigue Strength:** Excellent in thin-section applications - **Spring Properties:** Superior resilience and durability **B. Physical Properties** - **Density:** 8.00 g/cm³ (0.289 lb/in³) - **Modulus of Elasticity:** 185 GPa (26.8 × 10⁶ psi) - **Poisson's Ratio:** 0.30 - **Thermal Conductivity:** 19.0 - 21.0 W/m·K - **Thermal Expansion Coefficient:** 10.5 - 11.0 × 10⁻⁶/°C (20 - 100°C) - **Electrical Resistivity:** 0.60 - 0.65 μΩ·m **C. 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 for precision grades - **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, or custom blanks - **Thickness Tolerance:** ±0.005 mm for precision shims - **Surface Finish:** Ground or cold-rolled finish --- #### **4. Product 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 **Electronics & Special Applications** - **Lead frame** components - **Connector** spring elements - **Membrane** switch components - **Sensor** diaphragm elements - **Medical device** precision parts --- #### **5. International Standards & Specifications** | Standard Body | Specification Number | Title/Description | |---------------|----------------------|-------------------| | **AMS** | AMS 6512 | Steel Bars, Forgings, and Tubing 18Ni (250) | | **ASTM** | A538 | Standard Specification for Precipitation-Hardening Steel | | **ASTM** | A693 | Precipitation-Hardening Stainless Steel Plate | | **UNS** | K92890 | Unified Numbering System Designation | | **MIL** | MIL-S-46850 | Steel, Maraging 250 Grade | | **ISO** | 9445 | Continuously cold-rolled stainless steel strip | --- #### **6. Heat Treatment Process** **Solution Annealing (Before forming operations)** - **Temperature:** 820 ± 8°C (1,508 ± 14°F) - **Time:** 15-30 minutes depending on thickness - **Atmosphere:** Bright annealing required - **Cooling:** Controlled air cool - **Resulting Hardness:** 28-32 HRC **Aging Treatment (After forming)** - **Temperature:** 480 ± 5°C (896 ± 9°F) - **Time:** 1-3 hours for foil and shim thicknesses - **Cooling:** Air cool to room temperature - **Final Hardness:** 48-52 HRC --- #### **7. Fabrication & Processing** **Forming Characteristics** - **Bend Radius:** Minimum 1x material thickness for foil - **Stamping:** Excellent in annealed condition - **Punching:** Clean edges with proper tooling - **Flatness:** Maintains excellent dimensional stability **Surface Treatment Options** - **Passivation:** Per AMS-QQ-P-35 - **Plating:** Various plating options available - **Coating:** Special functional coatings - **Polishing:** Mirror finishes achievable --- #### **8. Quality Assurance** **Standard Testing Protocol** - **Dimensional Verification:** Laser micrometer inspection - **Surface Quality:** 100% visual examination - **Thickness Mapping:** Continuous scanning capability - **Mechanical Testing:** Sample testing from each lot **Specialized Quality Features** - **Burr-free Edges:** Critical for precision applications - **Surface Roughness:** Controlled to specific requirements - **Flatness Verification:** Optical measurement methods - **Cleanliness:** Controlled manufacturing environment --- **Packaging & Handling:** - Protective interleaving between layers - Moisture-resistant packaging - Static-dissipative packaging for electronic applications - Custom slitting and blanking services **Technical Support:** - Application engineering assistance - Fabrication process recommendations - Heat treatment guidance - Custom alloy modifications available **Contact Information:** [Your Company Information] *Note: All mechanical properties are typical for material in the fully aged condition. Foil and shim products are normally supplied in annealed condition for forming operations. Consult our technical team for specific application requirements and processing 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 2584 gallon liquid totes Special package is available on request.