Maraging 250,Maraging C250 Fittings,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

### **Technical Data Sheet: Maraging Steel 250 / Maraging C250 Fittings (UNS K92890)** --- #### **1. Product Overview** **Maraging Steel 250 Fittings** (commercially known as **Maraging C250 Fittings**, **UNS K92890**) are precision-engineered components manufactured from ultra-high-strength maraging steel. These fittings are specifically designed for critical applications requiring exceptional strength-to-weight ratio, superior fracture toughness, and excellent corrosion resistance. The "C250" designation represents commercial grade optimization for enhanced manufacturing consistency and performance reliability in fitting applications. --- #### **2. Chemical Composition (Weight %)** | Element | Composition (%) | Function | |---------|-----------------|----------| | **Nickel (Ni)** | 17.0-19.0 | Austenite stabilization, toughness | | **Cobalt (Co)** | 7.0-8.5 | Strengthening, inhibits austenite reversion | | **Molybdenum (Mo)** | 4.5-5.2 | Precipitation hardening, strength | | **Titanium (Ti)** | 0.3-0.5 | Primary age-hardening element | | **Aluminum (Al)** | 0.05-0.15 | Secondary age-hardening element | | **Carbon (C)** | ≤0.03 | Minimizes carbide formation | | **Iron (Fe)** | Balance | Matrix element | --- #### **3. Mechanical Properties** **A. Typical Mechanical Properties (Aged Condition)** - **Tensile Strength:** 1,724-1,793 MPa (250-260 ksi) - **Yield Strength (0.2% Offset):** 1,655-1,724 MPa (240-250 ksi) - **Elongation:** 10-12% - **Reduction in Area:** 45-55% - **Hardness:** 48-52 HRC - **Fracture Toughness (K_Ic):** 70-90 MPa√m **B. Physical Properties** - **Density:** 8.00 g/cm³ - **Modulus of Elasticity:** 185 GPa - **Thermal Expansion:** 10.5-11.0 × 10⁻⁶/°C (20-100°C) - **Thermal Conductivity:** 19.0-21.0 W/m·K --- #### **4. Fitting Types & Configurations** **Standard Fitting Styles:** - **AN/MS Flared Fittings** - **JIC 37° Flare Fittings** - **ORFS (O-Ring Face Seal) Fittings** - **NPT & BSPT Threaded Fittings** - **ISO 8434 Metric Fittings** **Available Configurations:** - **Elbows:** 45°, 90°, 135° - **Tees:** Straight, reducing, barred - **Unions:** Straight, bulkhead, reducing - **Adapters:** Male-female, port, swivel - **Caps & Plugs:** Hex, square, wing --- #### **5. Applications** **Aerospace & Defense:** - Aircraft hydraulic systems - Rocket propulsion systems - Missile guidance systems - Space vehicle fluid handling - Military vehicle hydraulics **Industrial & Energy:** - High-pressure hydraulic systems - Oil and gas instrumentation - Power generation systems - Test and measurement equipment - Process control systems --- #### **6. Standards & Specifications** | Organization | Standard | Description | |--------------|----------|-------------| | **AMS** | AMS 6512 | Material Specification | | **ASTM** | A538 | Grade 250 | | **MIL** | MIL-F-27435 | Fitting Assemblies | | **SAE** | AS4841 | Fitting Identification | | **ISO** | 8434-1 | Metallic Tube Connections | --- #### **7. Manufacturing Process** **Production Sequence:** 1. **Material Selection:** Vacuum melted stock 2. **Machining:** CNC turning/milling (annealed condition) 3. **Heat Treatment:** Solution treat + age harden 4. **Surface Treatment:** Passivation/plating 5. **Quality Verification:** 100% testing **Heat Treatment Cycle:** - **Solution Treatment:** 820°C ± 10°C, air cool - **Aging Treatment:** 480°C ± 5°C, 3-5 hours - **Resulting Hardness:** 48-52 HRC --- #### **8. Quality Assurance** **Testing & Certification:** - **Material Certification:** Traceable to melt - **Dimensional Inspection:** 100% verified - **Pressure Testing:** 1.5x working pressure - **NDT:** Liquid penetrant/magnetic particle - **Surface Finish:** Ra ≤ 0.8 μm **Performance Characteristics:** - **Pressure Rating:** Up to 10,000 psi - **Temperature Range:** -54°C to +400°C - **Corrosion Resistance:** Excellent - **Fatigue Life:** Superior performance --- #### **9. Technical Advantages** **Design Benefits:** - **Weight Savings:** 40% lighter than steel equivalents - **High Strength:** Superior strength-to-weight ratio - **Corrosion Resistance:** Excellent environmental performance - **Reliability:** Proven in critical applications - **Maintenance:** Reduced lifecycle costs --- **Ordering Information:** - Available in standard and custom configurations - Complete certification package provided - Technical support available - Custom engineering services offered **Contact:** [Your Company Information] *Specifications subject to change without notice. Consult factory for current technical data.*

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 2594 gallon liquid totes Special package is available on request.