Maraging 300,Udimar 300 Rod,UNS K93120,E FORU

British Specs:，American Specs:AMS 6514 Bar, Tube and Forgings AMS 6521 Sheet, Strip and Plate MIL-S-46850 TYPE 4 ASTM A579 / AMS 6514 Powder，German Specs:WS 1.6354 WS 1.6358

### **Technical Data Sheet: Maraging Steel 300 / Udimar 300 Rod (UNS K93120)** --- #### **1. Product Overview** **Maraging Steel 300 Rod** (commercially known as **Udimar 300 Rod**, **UNS K93120**) is a premium-grade round bar product manufactured from ultra-high-strength maraging steel, representing the highest strength grade in the standard maraging steel family. This rod product maintains the exceptional mechanical properties of Maraging 300 alloy while providing ideal stock material for machining critical components where maximum strength-to-weight ratio is required in aerospace, defense, and high-performance industrial applications. --- #### **2. Chemical Composition (Weight %)** | Element | Min (%) | Max (%) | Function | |---------|----------|----------|----------| | **Nickel (Ni)** | 18.00 | 19.00 | Matrix strengthening | | **Cobalt (Co)** | 8.50 | 9.50 | Solid solution strengthening | | **Molybdenum (Mo)** | 4.60 | 5.20 | Precipitation hardening | | **Titanium (Ti)** | 0.50 | 0.80 | 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:** 2,000-2,140 MPa (290-310 ksi) - **Yield Strength:** 1,930-2,070 MPa (280-300 ksi) - **Elongation:** 8-10% - **Reduction in Area:** 40-50% - **Hardness:** 52-56 HRC - **Fracture Toughness:** 50-70 MPa√m **B. Physical Properties** - **Density:** 8.00 g/cm³ - **Modulus of Elasticity:** 185 GPa - **Thermal Conductivity:** 18.0-20.0 W/m·K - **Thermal Expansion:** 10.4-10.9 × 10⁻⁶/°C --- #### **4. Product Specifications** **Rod Dimensions:** - **Diameter Range:** 5-300 mm (0.2-12 inches) - **Standard Lengths:** 3,000 & 4,000 mm (10' & 13') - **Diameter Tolerance:** h11 for standard precision - **Straightness:** ≤ 1.5 mm/m - **Surface Finish:** Turned, ground, or polished **Available Conditions:** - Annealed (32-36 HRC) - Aged (52-56 HRC) - Solution Treated --- #### **5. Applications** **Aerospace & Defense:** - Rocket motor case segments - Aircraft landing gear components - Missile body sections - Helicopter rotor shafts - Ordnance components **Tooling & Manufacturing:** - Precision mold bases - Die-casting cores - Extrusion press components - Injection molding screws - High-strength fixtures **High-Performance Industrial:** - Racing engine components - High-strength fasteners - Hydraulic cylinder rods - Test equipment shafts - Optical mounting systems --- #### **6. Standards & Specifications** | Organization | Standard | Description | |--------------|----------|-------------| | **AMS** | 6514 | Steel Bars, Forgings, and Tubing | | **ASTM** | A538 | Grade 300 | | **UNS** | K93120 | Unified Numbering System | | **MIL** | S-46850 | Maraging Steel Grade 300 | --- #### **7. Heat Treatment Process** **Solution Annealing:** - **Temperature:** 820 ± 10°C (1,508 ± 18°F) - **Time:** 1 hour per 25 mm diameter - **Cooling:** Air cool - **Hardness:** 32-36 HRC **Aging Treatment:** - **Temperature:** 480 ± 5°C (896 ± 9°F) - **Time:** 3-8 hours - **Cooling:** Air cool - **Hardness:** 52-56 HRC --- #### **8. Machining & Fabrication** **Machining Guidelines:** - Machine in annealed condition (32-36 HRC) - Carbide tools with positive rake angles - Moderate to high speeds with coolant - Excellent threading with proper tooling **Finishing Operations:** - Grinding for final dimensional adjustment - EDM for complex geometries - Polishing for mirror finishes - Various surface treatments compatible --- #### **9. Quality Assurance** **Testing & Certification:** - Chemical analysis certification - Mechanical testing from samples - Ultrasonic testing available - Macroetch testing for internal soundness - Full traceability documentation **Quality Standards:** - Aerospace quality (AS9100) - Nadcap accredited - Military compliance - Statistical process control --- **Packaging & Handling:** - Protective end caps - Individual wrapping or wooden crating - Clear identification marking - Custom cutting services **Contact:** [Your Company Information] *Note: All mechanical properties are typical for material in the fully aged condition. Properties may vary based on specific diameter and heat treatment parameters. Consult our technical team for application-specific 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 2613 gallon liquid totes Special package is available on request.