Maraging 250,Udimar 250 Forgings,,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 Forgings** --- #### **1. Product Overview** **Maraging Steel 250 Forgings** (commercially known as **Udimar 250 Forgings**) represent the premium product form of this ultra-high-strength maraging steel, manufactured through controlled thermomechanical processes to achieve superior grain structure and mechanical properties. The forging process refines the metallic microstructure, aligns grain flow with component contours, and eliminates internal defects, resulting in enhanced strength, improved fatigue resistance, and superior structural integrity compared to cast or machined components. These forgings are specifically engineered for the most demanding applications in aerospace, defense, and energy industries where reliability under extreme conditions is paramount. --- #### **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 Final Heat Treatment)** - **Tensile Strength:** 1,720 - 1,790 MPa (250 - 260 ksi) - **Yield Strength (0.2% Offset):** 1,655 - 1,725 MPa (240 - 250 ksi) - **Elongation:** 10 - 14% - **Reduction in Area:** 45 - 55% - **Hardness:** 48 - 52 HRC - **Fracture Toughness (K_Ic):** 70 - 90 MPa√m - **Fatigue Strength:** Superior high-cycle performance - **Impact Toughness (Charpy V):** 25 - 35 J **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 --- #### **4. Product Applications** **Aerospace & Aviation** - **Rocket motor cases** and nozzle components - **Aircraft landing gear** critical structural parts - **Helicopter rotor** hubs and mast components - **Turbine engine** shafts and discs - **Space vehicle** structural components **Defense & Military** - **Armor vehicle** suspension and drive components - **Weapon system** structural members - **Naval vessel** propeller shafts and components - **Military aircraft** critical structural forgings - **Missile launch** system components **Energy & Industrial** - **Oil and gas** drilling tool components - **Nuclear reactor** internal structural parts - **High-performance** racing components - **Heavy machinery** critical load-bearing parts - **Tooling and die** applications requiring high strength --- #### **5. Forging Capabilities** **Available Forging Types** - **Open Die Forgings:** Large, simple shapes up to 5000 kg - **Closed Die Forgings:** Complex, near-net shapes 0.5-500 kg - **Precision Forgings:** Minimal machining allowance - **Upset Forgings:** Increased cross-sections - **Rolled Ring Forgings:** Circular components up to 3000 mm diameter **Standard Forging Weights & Sizes** - **Open Die:** Up to 5000 kg, maximum dimensions 6000 mm - **Closed Die:** 0.5-500 kg, complex geometries - **Precision:** 0.1-200 kg, tight tolerances - **Rings:** Up to 3000 kg, diameters 200-3000 mm --- #### **6. 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 | | **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 | | **Nadcap** | AC7108 | Special Process - Forging | --- #### **7. Manufacturing & Quality Assurance** **Manufacturing Process** - **Material Selection:** Premium VIM-VAR or ESR melted stock - **Heating:** Controlled atmosphere forging furnaces - **Forging:** Precision controlled deformation processes - **Heat Treatment:** Solution treat and age to specified properties - **Machining:** Final precision machining capability - **Inspection:** Comprehensive quality verification **Quality Assurance** - **Material Certification:** Full traceability from melt to finished forging - **Ultrasonic Testing:** Per AMS 2630/EN 10228 standards - **Dimensional Verification:** CMM and optical measurement - **Mechanical Testing:** Batch testing from prolongations - **Microstructural Analysis:** Grain flow and inclusion rating - **Surface Quality:** Magnetic particle and dye penetrant inspection --- #### **8. Technical Advantages** **Forging Benefits** - **Superior Grain Flow:** Enhanced mechanical properties in critical directions - **Improved Integrity:** Elimination of internal voids and porosity - **Better Fatigue Life:** Superior performance under cyclic loading - **Material Efficiency:** Near-net shape capability reduces waste - **Design Flexibility:** Complex geometries with optimized weight **Performance Features** - **Weight Optimization:** Strategic material placement - **Reliability:** Consistent performance in critical applications - **Damage Tolerance:** Excellent fracture resistance - **Temperature Capability:** Wide operational temperature range - **Corrosion Resistance:** Good environmental performance --- **Design & Engineering Support:** - Custom shapes and sizes available - Design for manufacturability assistance - Prototype development services - Complete manufacturing capability from forging to finished part - Finite element analysis and optimization services **Contact Information:** [Your Company Information] *Note: All mechanical properties are typical for material in the fully aged condition. Forgings are normally supplied rough machined or finished machined to customer requirements. Consult our engineering team for specific application recommendations and design optimization.*

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 2582 gallon liquid totes Special package is available on request.