Maraging 350，Maraging C350 Tube，,E FORU

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

### **Product Datasheet: Maraging 350 / Maraging C350 Precision Tube** #### **Executive Summary** Maraging C350 Tube represents the pinnacle of ultra-high-strength tubular technology. Fabricated from a special low-carbon martensitic steel, this alloy achieves its extraordinary strength and toughness through a unique age-hardening heat treatment. Maraging C350 Tubes are engineered for mission-critical applications where maximum strength-to-weight ratio, superior reliability under extreme pressure or tension, and excellent dimensional stability are non-negotiable. The "C350" denotes a nominal yield strength of 350 ksi (≈2413 MPa). #### **Defining Characteristics** * **Ultra-High Strength-to-Weight Ratio:** Ideal for weight-sensitive structural applications. * **Exceptional Pressure Containment:** Superior tensile and yield strength make it perfect for high-pressure vessels and systems. * **High Fracture Toughness:** Resists crack propagation even at ultimate strength levels, a critical safety feature. * **Outstanding Fatigue Resistance:** Withstands cyclic loading in demanding environments. * **Superior Fabricability:** Tubes can be readily machined, welded, and formed in the soft, solution-annealed condition before the final age-hardening step. --- #### **Chemical Composition (Typical Weight %)** The composition is meticulously balanced to optimize the age-hardening response and final properties. | 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:** 10.2 x 10⁻⁶/°C (20-100°C) * **Modulus of Elasticity:** 185 - 190 GPa (27 x 10⁶ psi) **Mechanical Properties (After Full Heat Treatment: Solution Annealed & Aged)** *Typical values for aged tubular product. Properties can be tailored via specific aging parameters.* | 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 | | **Hardness** | 54 - 57 HRC | Aged | | **Fracture Toughness (K_Ic)** | 55 - 80 MPa√m | Aged | *Note: In the solution-annealed condition (soft state), the material typically has a hardness of 28-32 HRC, allowing for extensive machining, bending, and welding.* --- #### **International Standards & Specifications** Maraging C350 Tubing is produced to meet the stringent requirements of various international standards, particularly in aerospace. * **AMS (Aerospace Material Specification):** * **AMS 6521:** This is the primary specification for the material, covering the chemistry and heat-treated properties for bar, sheet, and plate. Tubing is often supplied to this standard's requirements. * **AMS 6519:** Covers 18% Nickel Maraging Steel (250 grade) Sheet, Strip, and Plate, and is a related standard for a lower strength grade, illustrating the family of materials. * **ASTM (American Society for Testing and Materials):** * **ASTM A579/A579M:** Standard Specification for Superstrength Alloy Steel Forgings. Certain grades cover maraging steels of similar strength levels. * **MIL-Spec (Military Specification):** * **MIL-S-8949:** This specification governs high-strength maraging steel plate, sheet, and strip for aerospace applications, often referenced for material quality. * **Customer-Specific Specifications:** Tubing is frequently manufactured to exacting customer prints and specifications that define OD, ID, wall thickness, concentricity, and surface finish tolerances beyond standard mill tolerances. --- #### **Product Applications** Maraging C350 Tubes are critical components in advanced engineering systems: * **Aerospace & Defense:** * **Rocket Motor Cases:** For solid and liquid propellant rockets where the tube acts as a high-pressure vessel. * **Aircraft Hydraulic Systems:** High-pressure actuator cylinders and tubing for flight controls. * **Landing Gear Components:** Struts and other structural tubular members. * **Space Vehicle Structures:** Lightweight, high-stress truss and frame members. * **Precision Machinery & Tooling:** * **Extrusion Presses:** Used as liners and containers for hot metal extrusion. * **Injection Molding Machines:** High-wear resistance components like screw barrels. * **High-Performance Rotating Shafts:** Driveshafts requiring high torsional strength. * **Racing & High-Performance Automotive:** * **Roll Cages and Chassis Tubing:** For maximum safety and minimum weight. * **High-Pressure Fuel Injection Lines.** * **Specialized Industrial Equipment:** * **Cylinders for High-Pressure Gas Storage.** * **Components in Oil & Gas Downhole Tools.** --- #### **Conclusion** Maraging C350 Tube is the material of choice when conventional high-strength steels are insufficient. Its unparalleled combination of strength, toughness, and manufacturability enables the design of lighter, safer, and more reliable systems in the most challenging environments on Earth and in space. For engineers pushing the boundaries of performance, Maraging C350 Tube provides a proven, reliable solution.

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 2642 gallon liquid totes Special package is available on request.