Maraging 300,Udimar 300 Pipe,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 Pipe (UNS K93120)** --- #### **1. Product Overview** **Maraging Steel 300 Pipe** (commercially known as **Udimar 300 Pipe**, **UNS K93120**) is a seamless tubular product manufactured from ultra-high-strength maraging steel, designed for applications requiring the highest strength-to-weight ratio in hollow sections. This product combines the exceptional mechanical properties of Maraging 300 alloy with the advantages of tubular construction, providing optimal solutions for pressure vessels, structural components, and high-performance systems in aerospace, defense, and energy industries where maximum strength is critical. --- #### **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% - **Hardness:** 52-56 HRC - **Fracture Toughness:** 50-70 MPa√m - **Burst Pressure Ratio:** Excellent performance under internal pressure **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** **Pipe Dimensions:** - **Outside Diameter:** 12-250 mm (0.5-10 inches) - **Wall Thickness:** 2-25 mm (0.08-1.0 inches) - **Length:** 3,000-6,000 mm (10-20 feet) - **Diameter Tolerance:** ±0.5% of nominal OD - **Wall Thickness Tolerance:** ±10% of nominal wall - **Straightness:** ≤ 1.0 mm/m - **Concentricity:** Maintained within strict limits **Available Conditions:** - Annealed (32-36 HRC) - Solution Treated - Aged (52-56 HRC) --- #### **5. Applications** **Aerospace & Defense:** - Rocket motor cases - Aircraft hydraulic systems - Missile body sections - Helicopter rotor shafts - Ordnance pressure vessels **Energy & Industrial:** - High-pressure gas storage - Hydraulic accumulator shells - Process industry tubing - Oil and gas downhole tools - Nuclear reactor components **High-Performance Applications:** - Racing vehicle structural tubes - High-pressure test equipment - Marine applications - Special vehicle frames - Scientific instruments --- #### **6. Standards & Specifications** | Organization | Standard | Description | |--------------|----------|-------------| | **AMS** | 6514 | Bars, Forgings, and Tubing | | **ASTM** | A538 | Grade 300 | | **ASTM** | A789 | Seamless and Welded Tubing | | **UNS** | K93120 | Unified Numbering System | --- #### **7. Heat Treatment Process** **Solution Annealing:** - **Temperature:** 820 ± 10°C (1,508 ± 18°F) - **Time:** 1 hour per 25 mm wall thickness - **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. Fabrication & Welding** **Machining & Forming:** - Machine in solution-annealed state - Carbide tools recommended - Minimum bend radius 3x pipe diameter - Excellent threading results **Welding Procedures:** - Good weldability with proper techniques - TIG welding preferred - Matching filler metal recommended - Solution anneal after welding --- #### **9. Quality Assurance** **Testing & Certification:** - Hydrostatic testing - Ultrasonic testing - Dimensional inspection - Surface quality examination - Full traceability **Quality Features:** - Pressure rating certification - NDT capability - Material certificates - Compliance documentation --- **Packaging & Handling:** - Protective end caps - Individual wrapping - Clear identification - Special handling for large diameters **Contact:** [Your Company Information] *Note: All mechanical properties are typical for material in the fully aged condition. Pressure ratings should be verified for specific applications. Consult engineering team for design 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 2615 gallon liquid totes Special package is available on request.