Maraging 350，Maraging C350 Sheet，,E FORU

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

### **Product Datasheet: Maraging 350 / Maraging C350 Steel Sheet & Strip** #### **Executive Summary** Maraging 350 (Maraging C350) Sheet is an ultra-high-strength, low-carbon martensitic steel supplied in thin sheet and strip forms. The "350" denotes its nominal yield strength of 350 ksi (approximately 2413 MPa), the highest level among commercial maraging grades. This alloy achieves its exceptional properties through a unique age-hardening heat treatment, which precipitates intermetallic compounds within a soft, ductile martensitic matrix. Maraging C350 Sheet is engineered for weight-critical and space-constrained applications demanding the ultimate in strength, toughness, and reliable performance under extreme stress. #### **Key Advantages** * **Ultra-High Strength-to-Weight Ratio:** Ideal for lightweight structural components where every gram counts. * **Excellent Fabricability in the Annealed State:** Can be blanked, sheared, formed, and welded with relative ease in the soft condition before final age hardening. * **Superior Fracture Toughness:** Provides exceptional resistance to crack propagation, a critical safety factor in high-integrity designs. * **Minimal Distortion During Aging:** The low-temperature aging process results in very little warping or dimensional change, preserving the accuracy of formed shapes. * **Good Surface Finish:** Capable of achieving a high-quality surface, suitable for critical exposed components. --- #### **Chemical Composition (Typical Weight %)** The composition is precisely controlled to ensure optimal age-hardening response and consistent performance in thin sections. | 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 sheet 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 (in 2 inches / 50mm)** | 6 - 10 % | Aged | | **Hardness** | 54 - 57 HRC | Aged | | **Fracture Toughness (K_Ic)** | 55 - 80 MPa√m | Aged | *Note: In the solution-annealed condition (soft state), the sheet has a hardness of approximately 28-32 HRC, allowing for deep drawing, bending, and other forming operations.* --- #### **International Standards & Specifications** Maraging C350 Sheet and Strip are produced to meet the stringent requirements of international aerospace and military standards. * **AMS (Aerospace Material Specification):** * **AMS 6521G:** This is the primary specification for Maraging 350 in the form of Sheet, Strip, and Plate. It comprehensively covers chemical composition, heat treatment, and mechanical property requirements. * **ASTM (American Society for Testing and Materials):** * While a specific ASTM for "sheet" may be less common, the material chemistry and properties align with the spirit of standards like **ASTM A579/A579M** for super-strength steels. * **U.S. Military Standards:** * **MIL-S-8949:** This specification for Maraging Steel Plate, Sheet, and Strip is a key governing document for defense applications. * **Additional Requirements:** Sheet products can be supplied with specific tolerances (e.g., to ASTM A505 for sheet and strip), and with certified ultrasonic inspection per standards like AMS 2631. --- #### **Product Applications** Maraging C350 Sheet is specified for critical, thin-gauge components across advanced technology sectors: * **Aerospace & Defense:** * **Rocket & Missile Skin and Shrouds:** Lightweight, high-strength structural skin that must withstand high aerodynamic forces and thermal loads. * **Aircraft Wing and Fuselage Panels:** For high-performance military aircraft where strength-to-weight ratio is paramount. * **Pressure Diaphragms and Bellows:** Thin, formed membranes for sensitive pressure instruments and actuators in aerospace systems. * **Helicopter Armor Seating:** Lightweight ballistic protection. * **Precision Engineering:** * **High-Performance Springs:** For applications requiring extreme strength in a small envelope. * **Diaphragms for High-Pressure Pumps and Compressors.** * **Critical Shims and Spacers:** Where high compressive strength and minimal thickness are required. * **Electronic Components:** * **Lead Frames** for high-reliability electronics (in specific applications). * **Tooling:** * **Forming Dies and Punches** for sheet metal fabrication. --- #### **Conclusion** Maraging C350 Sheet offers an unmatched combination of ultra-high strength, formability, and toughness in a thin, lightweight product form. Its unique heat treatment characteristics allow for complex fabrication before being transformed into a final, immensely strong component. For engineers designing the core structures of rockets, aircraft, and other high-performance systems, Maraging C350 Sheet provides a critical material solution where performance cannot be compromised. --- **Disclaimer:** The information provided is for reference purposes. Actual properties may vary based on manufacturer, thickness, and processing. Always consult the manufacturer's technical data sheet for project-specific specifications and performance data.

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 2644 gallon liquid totes Special package is available on request.