Maraging 250,Udimar 250 Other/Similar Specs,,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 & Similar Specifications** --- #### **1. Product Overview** The **Maraging Steel 250** category (commercially known as **Udimar 250**) belongs to a family of ultra-high-strength martensitic age-hardening steels that offer exceptional combinations of strength, toughness, and dimensional stability. This product group includes various similar specifications and alternative grades that provide different balances of mechanical properties for specific application requirements. These alloys represent advanced metallurgical technology in the ultra-high-strength steel domain, offering engineers multiple options for critical applications in aerospace, defense, tooling, and energy industries. --- #### **2. Chemical Composition Comparison (Weight %)** | Element | Maraging 250 | Maraging 300 | Maraging 200 | 18Ni(300) | 18Ni(250) | |---------|--------------|--------------|--------------|-----------|-----------| | **Nickel (Ni)** | 17.0-19.0 | 18.0-19.0 | 17.0-19.0 | 18.0-19.0 | 17.0-19.0 | | **Cobalt (Co)** | 7.0-8.5 | 8.5-9.5 | - | 8.5-9.5 | 7.0-8.5 | | **Molybdenum (Mo)** | 4.5-5.2 | 4.5-5.2 | 3.0-3.5 | 4.5-5.2 | 4.5-5.2 | | **Titanium (Ti)** | 0.3-0.5 | 0.5-0.8 | 0.15-0.25 | 0.5-0.8 | 0.3-0.5 | | **Aluminum (Al)** | 0.05-0.15 | 0.05-0.15 | 0.05-0.15 | 0.05-0.15 | 0.05-0.15 | | **Carbon (C)** | ≤0.03 | ≤0.03 | ≤0.03 | ≤0.03 | ≤0.03 | --- #### **3. Comparative Mechanical Properties** **A. Mechanical Properties (Typical Aged Condition)** | Property | Maraging 250 | Maraging 300 | Maraging 200 | 18Ni(300) | 18Ni(250) | |----------|--------------|--------------|--------------|-----------|-----------| | **Tensile Strength (MPa)** | 1,720-1,790 | 2,000-2,100 | 1,400-1,500 | 2,000-2,100 | 1,720-1,790 | | **Yield Strength (MPa)** | 1,655-1,725 | 1,900-2,000 | 1,350-1,400 | 1,900-2,000 | 1,655-1,725 | | **Elongation (%)** | 10-14 | 8-10 | 12-15 | 8-10 | 10-14 | | **Reduction Area (%)** | 45-55 | 40-50 | 50-60 | 40-50 | 45-55 | | **Hardness (HRC)** | 48-52 | 52-56 | 44-48 | 52-56 | 48-52 | | **Fracture Toughness (MPa√m)** | 70-90 | 50-70 | 90-110 | 50-70 | 70-90 | **B. Physical Properties Range** - **Density:** 7.8-8.1 g/cm³ - **Modulus of Elasticity:** 180-190 GPa - **Thermal Expansion:** 10.0-11.5 × 10⁻⁶/°C (20-100°C) - **Thermal Conductivity:** 18-25 W/m·K - **Electrical Resistivity:** 0.55-0.70 μΩ·m --- #### **4. Product Applications & Selection Guide** **Aerospace Applications** - **Maraging 250:** Rocket motor cases, aircraft components - **Maraging 300:** Highest strength aerospace components - **Maraging 200:** Applications requiring maximum toughness - **18Ni(300):** Critical structural aerospace parts - **18Ni(250):** General purpose high-strength applications **Defense & Military** - **Maraging 250:** Armor components, military vehicle parts - **Maraging 300:** High-stress defense applications - **Maraging 200:** Ballistic protection systems - **18Ni(300):** Weapon system components - **18Ni(250):** General defense applications **Tooling & Industrial** - **Maraging 250:** Precision molds, die-casting tools - **Maraging 300:** High-wear tooling applications - **Maraging 200:** Tooling requiring good impact resistance - **18Ni(300):** High-performance dies and molds - **18Ni(250):** General tooling applications **Selection Criteria** - **Maximum Strength:** Maraging 300 or 18Ni(300) - **Balanced Properties:** Maraging 250 or 18Ni(250) - **Maximum Toughness:** Maraging 200 - **Cost Optimization:** 18Ni series for standard applications - **Special Requirements:** Custom grades available --- #### **5. International Standards & Specifications** | Material Grade | AMS | UNS | ASTM | MIL | ISO | |---------------|-----|-----|------|-----|-----| | **Maraging 250** | 6512 | K92890 | A538 | MIL-S-46850 | 683-13 | | **Maraging 300** | 6514 | K93120 | A538 | MIL-S-46850 | 683-13 | | **Maraging 200** | - | K92870 | A538 | - | 683-13 | | **18Ni(300)** | 6514 | K93120 | A538 | MIL-S-46850 | 683-13 | | **18Ni(250)** | 6512 | K92890 | A538 | MIL-S-46850 | 683-13 | --- #### **6. Heat Treatment Comparison** **Maraging 250 & 18Ni(250)** - **Solution Treatment:** 820°C ± 10°C, air cool - **Aging Temperature:** 480°C ± 5°C for 3-6 hours - **Cooling:** Air cool after aging **Maraging 300 & 18Ni(300)** - **Solution Treatment:** 820°C ± 10°C, air cool - **Aging Temperature:** 480°C ± 5°C for 3-8 hours - **Cooling:** Air cool after aging **Maraging 200** - **Solution Treatment:** 820°C ± 10°C, air cool - **Aging Temperature:** 480°C ± 5°C for 3-6 hours - **Cooling:** Air cool after aging --- #### **7. Key Advantages & Limitations** **Maraging 250 / 18Ni(250)** - ✓ Excellent strength-toughness balance - ✓ Good dimensional stability - ✓ Reliable performance - ✗ Lower strength than 300 grade - ✗ Higher cost than conventional steels **Maraging 300 / 18Ni(300)** - ✓ Highest strength in maraging family - ✓ Excellent for weight-critical applications - ✓ Good wear resistance - ✗ Lower toughness than 250 grade - ✗ More sensitive to notches **Maraging 200** - ✓ Best toughness in maraging family - ✓ Excellent impact resistance - ✓ Good stress corrosion resistance - ✗ Lower strength than other grades - ✗ Limited availability --- #### **8. Quality & Certification** **Standard Certifications** - Material Chemical Analysis Certification - Mechanical Property Test Reports - Heat Treatment Certificates - Non-Destructive Testing Reports - Source Inspection Reports **Additional Testing Available** - Fracture Toughness Testing - Stress Corrosion Testing - Fatigue Testing - Microstructural Analysis - Grain Size Determination --- **Technical Support Notes:** - Consult engineering team for material selection guidance - Provide application requirements for optimal grade recommendation - Consider total life cycle cost in material selection - Evaluate environmental conditions and loading requirements - Review manufacturing and heat treatment capabilities **Contact Information:** [Your Company Information] *Note: All mechanical properties are typical values and may vary based on specific processing conditions, section size, and heat treatment parameters. Consult official material specifications for definitive requirements and application-specific recommendations. Custom compositions and heat treatments available for special applications.*

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 2583 gallon liquid totes Special package is available on request.