Maraging 250,Udimar 250 Sheet,,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 Sheet** --- #### **1. Product Overview** **Maraging Steel 250 Sheet** (commercially known as **Udimar 250 Sheet**) is a thin, flat-rolled product made from ultra-high-strength maraging steel, designed for applications requiring exceptional strength-to-weight ratio in lightweight structures. This martensitic age-hardening steel sheet offers outstanding mechanical properties with excellent formability in the annealed condition, making it suitable for aerospace components, defense systems, and high-performance applications where weight reduction and reliability are critical. --- #### **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 - **Fracture Toughness:** Maintains good toughness in thin sections - **Bendability:** Excellent in annealed condition **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. Sheet Specifications** - **Thickness Range:** 0.5 mm - 6.0 mm (0.020" - 0.236") - **Width Range:** 600 mm - 1,200 mm (24" - 48") - **Length Range:** 1,200 mm - 2,400 mm (48" - 96") - **Thickness Tolerance:** ±0.05 mm for precision grades - **Flatness:** ≤ 2 mm/m - **Surface Finish:** Cold-rolled, annealed, and pickled --- #### **4. Product Applications** **Aerospace & Aviation** - **Aircraft structural** panels and skin components - **Wing and tail** surface reinforcements - **Rocket motor** case segments - **Helicopter armor** protection panels - **Space vehicle** structural members **Defense & Security** - **Armor vehicle** structural panels - **Weapon system** enclosures and mounts - **Military equipment** housings - **Ballistic protection** inserts - **Portable defense** system components **Precision Engineering** - **High-performance** tooling components - **Precision instrument** frames - **Optical mounting** systems - **Medical device** components - **Testing equipment** structural 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 | Standard Specification for Precipitation-Hardening Stainless Steel Plate | | **UNS** | K92890 | Unified Numbering System Designation | | **MIL** | MIL-S-46850 | Steel, Maraging 250 Grade | | **ISO** | 683-13 | Heat-treatable steels, alloy steels, and free-cutting steels | --- #### **6. Heat Treatment Process** **Solution Annealing (Before forming operations)** - **Temperature:** 820 ± 10°C (1,508 ± 18°F) - **Time:** 30-60 minutes depending on thickness - **Atmosphere:** Protective atmosphere required - **Cooling:** Air cool to room temperature - **Resulting Hardness:** 28-32 HRC **Aging Treatment (After forming and machining)** - **Temperature:** 480 ± 5°C (896 ± 9°F) - **Time:** 2-4 hours for sheet thicknesses - **Cooling:** Air cool to room temperature - **Final Hardness:** 48-52 HRC --- #### **7. Forming & Fabrication** **Forming Characteristics:** - **Bend Radius:** Minimum 2x material thickness - **Stretch Forming:** Suitable for complex shapes - **Deep Drawing:** Good performance in annealed condition - **Springback:** Predictable and consistent **Machining & Joining:** - **Machining:** Best performed in annealed condition - **Welding:** TIG and laser welding recommended - **Adhesive Bonding:** Excellent surface for bonding - **Fastening:** All conventional methods applicable --- #### **8. Quality Assurance** **Standard Testing:** - **Dimensional Verification:** Laser thickness measurement - **Surface Inspection:** 100% visual examination - **Mechanical Testing:** Tensile tests from samples - **Flatness Measurement:** Optical flatness verification **Quality Certifications:** - **Material Traceability:** Full mill certification - **Surface Quality:** Free from scale and imperfections - **Heat Treatment Certification:** When supplied in aged condition - **Compliance Certification:** Meeting aerospace standards --- **Packaging & Handling:** - Protective interleaving between sheets - Moisture-resistant wrapping - Wooden crates for large shipments - Clear identification and certification **Contact Information:** [Your Company Information] *Note: All mechanical properties are typical for material in the fully aged condition. Forming and fabrication should be completed before final aging treatment. Consult our technical team for specific application recommendations and processing guidelines.*

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 2579 gallon liquid totes Special package is available on request.