Maraging 250,Maraging C250 Strip,UNS K92890,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 / Maraging C250 Strip (UNS K92890)** --- #### **1. Product Overview** **Maraging Steel 250 Strip** (commercially designated as **Maraging C250 Strip**, **UNS K92890**) is a precision cold-rolled product manufactured from ultra-high-strength maraging steel, supplied in thin, narrow coils or straight lengths. This product combines the exceptional mechanical properties of Maraging 250 alloy with the dimensional precision and surface quality required for high-volume manufacturing of small, complex components. The strip product enables production of precision parts where consistent material properties and tight tolerances are critical for performance in aerospace, defense, and electronic applications. The "C250" designation indicates commercial grade optimization for enhanced stamping and forming characteristics. --- #### **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 high-cycle applications - **Spring Properties:** Excellent 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. Strip Specifications** - **Thickness Range:** 0.05 mm - 3.0 mm (0.002" - 0.118") - **Width Range:** 10 mm - 300 mm (0.4" - 12") - **Coil Dimensions:** ID 510 mm (20"), OD up to 1,500 mm (59") - **Thickness Tolerance:** ±0.005 mm for precision grades - **Width Tolerance:** ±0.1 mm for precision slitting - **Surface Finish:** Bright annealed or skin passed available --- #### **4. Product Applications** **Precision Components** - **Aircraft fastener** systems and components - **Spring components** for aerospace and defense - **Shim stock** for critical assemblies - **Retaining rings** and precision clips - **Contact components** for electronic devices **Electronics & Defense** - **Connector components** for high-rel applications - **Relay and switch** parts requiring high strength - **Weapon system** small components - **Guidance system** precision parts - **Armor system** internal components **Industrial Applications** - **High-strength springs** for automotive and aerospace - **Precision stampings** for medical devices - **Cutting tool stock** for special applications - **Bearing components** requiring high durability - **Instrumentation** precision elements --- #### **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 stamping/forming)** - **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:** 2-3 hours for strip materials - **Cooling:** Air cool to room temperature - **Final Hardness:** 48-52 HRC --- #### **7. Fabrication Characteristics** **Stamping & Forming:** - **Blankability:** Excellent in annealed condition - **Formability:** Suitable for complex geometries - **Punching:** Clean edges with proper die clearance - **Bendability:** Minimum bend radius 2x material thickness **Surface Treatment:** - **Plating:** Excellent substrate for various platings - **Passivation:** Improves corrosion resistance - **Coating:** Various functional coatings applicable - **Polishing:** Achieves high surface finishes --- #### **8. Quality Assurance** **Standard Testing:** - **Dimensional Control:** Laser scanning for continuous monitoring - **Surface Quality:** 100% visual inspection available - **Mechanical Testing:** Statistical process control maintained - **Chemical Analysis:** Ladle and product analysis certified **Specialized Testing:** - **Microcleanliness:** Stringent inclusion rating control - **Flatness Verification:** Laser flatness measurement - **Edge Quality:** Burr height and edge condition monitoring - **Surface Roughness:** Profilometer measurement capability --- **Packaging & Handling:** - Protective interleaving for surface preservation - Moisture-resistant wrapping with desiccant - Custom slitting and rewinding services - Clear identification and certification included **Technical Support:** - Stamping and forming process optimization - Heat treatment guidance for specific applications - Quality assurance program development - Custom alloy modification available **Contact Information:** [Your Company Information] *Note: All mechanical properties are typical for material in the fully aged condition. Strip is normally supplied in annealed condition for forming operations. Maraging C250 Strip offers enhanced stamping performance and consistent quality for commercial strip applications. 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 2593 gallon liquid totes Special package is available on request.