Maraging 250,Maraging C250 Forgings,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 Forgings (UNS K92890)** --- #### **1. Product Overview** **Maraging Steel 250 Forgings** (commercially designated as **Maraging C250 Forgings**, **UNS K92890**) represent premium-grade forged components manufactured from ultra-high-strength maraging steel. These forgings undergo controlled thermomechanical processing to achieve superior grain structure refinement, enhanced mechanical properties, and optimized directional strength characteristics. The "C250" designation indicates commercial grade optimization for improved forgeability and consistent performance in demanding applications. --- #### **2. Chemical Composition (Weight %)** | Element | Min (%) | Max (%) | Role in Alloy | |---------|----------|----------|---------------| | **Nickel (Ni)** | 17.00 | 19.00 | Austenite stabilization | | **Cobalt (Co)** | 7.00 | 8.50 | Strengthening | | **Molybdenum (Mo)** | 4.50 | 5.20 | Precipitation hardening | | **Titanium (Ti)** | 0.30 | 0.50 | Primary age-hardening | | **Aluminum (Al)** | 0.05 | 0.15 | Secondary age-hardening | | **Carbon (C)** | - | 0.03 | Impurity control | | **Iron (Fe)** | - | - | Balance | --- #### **3. Mechanical & Physical Properties** **A. Mechanical Properties (Aged Condition)** - **Tensile Strength:** 1,724-1,793 MPa (250-260 ksi) - **Yield Strength:** 1,655-1,724 MPa (240-250 ksi) - **Elongation:** 10-14% - **Reduction of Area:** 45-55% - **Hardness:** 48-52 HRC - **Fracture Toughness:** 70-90 MPa√m - **Impact Strength:** 25-35 J (Charpy V-notch) **B. Physical Properties** - **Density:** 8.00 g/cm³ - **Modulus of Elasticity:** 185 GPa - **Thermal Expansion:** 10.5-11.0 × 10⁻⁶/°C - **Thermal Conductivity:** 19.0-21.0 W/m·K --- #### **4. Forging Capabilities** **Forging Types Available:** - **Open Die Forgings:** Large, simple shapes - **Closed Die Forgings:** Complex, near-net shapes - **Precision Forgings:** Minimal machining allowance - **Upset Forgings:** Increased cross-sections **Size Ranges:** - **Weight Range:** 1 kg - 5,000 kg - **Maximum Dimensions:** 6,000 mm length - **Complexity:** High geometry complexity achievable --- #### **5. Applications** **Aerospace & Defense:** - Aircraft landing gear components - Rocket motor cases - Missile structural members - Helicopter rotor components - Space vehicle structures **Industrial & Energy:** - High-performance tooling - Oil and gas components - Nuclear reactor parts - Heavy machinery components - Racing and automotive parts --- #### **6. Standards & Specifications** | Organization | Standard | Description | |--------------|----------|-------------| | **AMS** | 6512 | Bars, Forgings, and Tubing | | **ASTM** | A538 | Grade 250 | | **MIL** | S-46850 | Maraging Steel Grade 250 | | **ISO** | 683-13 | Heat-treatable Steels | --- #### **7. Manufacturing Process** **Forging Sequence:** 1. **Material Preparation:** Vacuum melted stock 2. **Heating:** Controlled atmosphere furnaces 3. **Forging:** Precision deformation processing 4. **Heat Treatment:** Solution treat + age harden 5. **Machining:** Final precision machining **Heat Treatment:** - **Solution Treatment:** 820°C ± 10°C, air cool - **Aging Treatment:** 480°C ± 5°C, 3-6 hours - **Microstructure:** Fine-grained martensite --- #### **8. Quality Assurance** **Testing & Certification:** - **Ultrasonic Testing:** Per AMS 2630 - **Chemical Analysis:** Full traceability - **Mechanical Testing:** Batch testing - **Macroetch Testing:** Grain flow verification - **Dimensional Inspection:** CMM verification **Quality Standards:** - **NADCAP Accredited** - **AS9100 Certified** - **MIL-STD-1530 Compliance** --- #### **9. Technical Advantages** **Forging Benefits:** - **Superior Grain Flow:** Enhanced mechanical properties - **Improved Integrity:** Reduced internal defects - **Better Fatigue Life:** Superior cyclic performance - **Material Efficiency:** Near-net shape capability --- **Ordering Information:** - Custom shapes and sizes available - Prototype development services - Complete manufacturing capability - Technical support provided **Contact:** [Your Company Information] *All specifications subject to manufacturing capabilities and final heat treatment parameters. Consult engineering for specific application requirements.*

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 2595 gallon liquid totes Special package is available on request.