Maraging 350，Maraging C350 Fittings，,E FORU

British Specs:，American Specs: AMS 6515 MIL-S-46850，German Specs: WS 1.6356

### **Product Datasheet: Maraging 350 / Maraging C350 Precision Fittings & Components** #### **Executive Summary** Maraging 350 (Maraging C350) Fittings are precision-engineered components manufactured from the highest grade of ultra-high-strength, low-carbon martensitic steel. These fittings are designed to connect, redirect, or terminate systems operating under extreme pressure and stress. Like other forms of the alloy, Maraging C350 Fittings derive their exceptional properties from a unique age-hardening heat treatment, achieving a nominal yield strength of 350 ksi (≈2413 MPa). They are the critical link in high-performance systems where fitting failure is not an option. #### **Key Characteristics & Advantages** * **Ultra-High Pressure Containment:** Capable of withstanding immense internal and external pressures, making them ideal for hydraulic and propulsion systems. * **Superior Strength-to-Weight Ratio:** Provides significant weight savings over lower-strength steel or nickel-alloy fittings, crucial for aerospace applications. * **Exceptional Thread Strength and Galling Resistance:** Maintains thread integrity and resists seizing under high torque and pre-load conditions. * **Outstanding Fracture Toughness:** Offers high resistance to crack initiation and propagation, ensuring fail-safe performance. * **Dimensional Stability After Aging:** The final age-hardening process induces minimal distortion, preserving the precise tolerances and thread forms of the machined fittings. --- #### **Chemical Composition (Typical Weight %)** The composition is meticulously controlled to ensure consistent and reliable age-hardening response in finished components. | Element | Content (%) | Element | Content (%) | | :--- | :--- | :--- | :--- | | **Nickel (Ni)** | 18.0 - 19.0 | **Cobalt (Co)** | 11.5 - 12.5 | | **Molybdenum (Mo)**| 4.6 - 5.2 | **Titanium (Ti)** | 1.3 - 1.6 | | **Carbon (C)** | ≤ 0.03 | **Manganese (Mn)** | ≤ 0.10 | | **Silicon (Si)** | ≤ 0.10 | **Sulfur (S)** | ≤ 0.010 | | **Phosphorus (P)** | ≤ 0.010 | **Aluminum (Al)** | 0.05 - 0.15 | | **Boron (B)** | 0.003 - 0.005 | **Zirconium (Zr)** | 0.01 - 0.02 | | **Iron (Fe)** | **Balance** | | | --- #### **Physical & Mechanical Properties** **Physical Properties** * **Density:** 8.10 g/cm³ (0.292 lb/in³) * **Melting Point:** ~ 1410°C (2570°F) * **Coefficient of Thermal Expansion (20-100°C):** 10.2 x 10⁻⁶/°C * **Modulus of Elasticity:** 185 - 190 GPa (27 x 10⁶ psi) **Mechanical Properties (After Full Heat Treatment: Solution Annealed & Aged)** *Typical values for aged fittings. Properties are verified through testing of representative samples.* | Property | Typical Value | Condition | | :--- | :--- | :--- | | **Tensile Strength** | 2450 - 2550 MPa (355 - 370 ksi) | Aged | | **Yield Strength (0.2% Offset)** | 2340 - 2410 MPa (340 - 350 ksi) | Aged | | **Elongation** | 8 - 12 % | Aged | | **Reduction of Area** | 35 - 50 % | Aged | | **Hardness** | 54 - 57 HRC | Aged | | **Fracture Toughness (K_Ic)** | 55 - 80 MPa√m | Aged | *Note: Fittings are typically machined from bar or forged stock in the soft, solution-annealed condition (28-32 HRC), which allows for efficient machining of complex geometries and sharp, clean threads.* --- #### **International Standards & Specifications** Maraging C350 Fittings are manufactured in compliance with the most stringent international standards for material quality and, where applicable, dimensional requirements. * **Material Standards:** * **AMS 6521G:** The primary aerospace specification for Maraging 350 bar, forging, and plate stock used to manufacture these fittings. * **AMS 6519:** Sometimes referenced for 18% Nickel Maraging Steel (250 grade), indicating the material family's pedigree. * **Dimensional & Performance Standards (Applicable where designed to):** * **SAE AS 1820:** Specifies the requirements for "Fitting, Tube, Flared, 37° and Flaredless, High Pressure." * **MIL-F-2745:** Military specification for fittings, which may be called out for defense projects. * **SAE AS 5202:** Metric tube fitting specifications. * **Customer-Specific Prints:** Fittings are often produced to exacting customer-engineered drawings that define dimensions, tolerances, and specific NDT requirements. --- #### **Product Applications** Maraging C350 Fittings are deployed in the most critical high-pressure and high-integrity systems across several industries: * **Aerospace & Defense:** * **Rocket Propulsion Systems:** Fuel, oxidizer, and hydraulic line fittings in launch vehicles and spacecraft. * **Aircraft Hydraulic Systems:** High-pressure fittings for flight control actuators, landing gear, and braking systems. * **Missile Systems:** Fittings for guidance, propulsion, and control systems. * **High-Performance Automotive & Motorsport:** * **Hydraulic Suspension and Braking Systems.** * **High-Pressure Fuel System Components.** * **Oil & Gas:** * **Downhole Tools:** Fittings for logging tools, packers, and other equipment operating under extreme downhole pressures. * **Specialized Industrial Equipment:** * **High-Pressure Test Rigs and Manifolds.** * **Isostatic Pressing Systems.** #### **Fabrication & Quality Assurance** * **Manufacturing:** Fittings are precision-machined from Maraging C350 bar stock or closed-die forgings to ensure optimal grain flow and strength. * **Heat Treatment:** After machining, fittings undergo final age-hardening per AMS 6521 to achieve their ultra-high strength. * **Quality Control:** 100% dimensional inspection is standard. Non-Destructive Testing (NDT) such as Liquid Penetrant (PT) or Magnetic Particle (MT) inspection is routinely performed to ensure integrity. * **Traceability:** Full material and heat treatment traceability is maintained per industry requirements. --- #### **Conclusion** Maraging C350 Fittings represent the ultimate solution for connecting critical fluid systems operating at the boundaries of pressure and performance. Their unmatched strength, toughness, and reliability make them an essential component in advancing aerospace technology, enhancing national defense capabilities, and enabling other high-stakes industrial applications. When system integrity is paramount, Maraging C350 Fittings provide the critical, high-confidence connection. --- **Disclaimer:** The information provided is for reference purposes. The performance and suitability of Maraging C350 Fittings are dependent on specific design, installation, and operating conditions. Always consult with the component manufacturer and a qualified engineer for final design and specification.

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 2646 gallon liquid totes Special package is available on request.