Maraging 350，Maraging C350 Pipe，,E FORU

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

### **Product Introduction: Maraging 350 / Maraging C350 Steel Pipe & Tube** #### **Overview** Maraging 350 (also commonly referred to as Maraging C350) is a premier-grade, low-carbon, iron-nickel martensitic steel renowned for its exceptional combination of ultra-high strength, excellent fracture toughness, and good fabricability. The "350" in its name denotes its nominal yield strength of 350 ksi (approximately 2413 MPa). This alloy undergoes a unique age-hardening process that precipitates intermetallic compounds within a soft, ductile martensitic matrix, resulting in its extraordinary mechanical properties. Maraging C350 Pipes are engineered for the most demanding applications where strength-to-weight ratio, reliability, and performance under extreme stress are critical. #### **Key Advantages** * **Ultra-High Strength:** Achieves yield strengths exceeding 2400 MPa (350 ksi). * **Superior Toughness:** Maintains excellent fracture toughness and ductility even at high strength levels. * **Simple Heat Treatment:** Age-hardening is performed at a relatively low temperature (around 480°C / 900°F) with low distortion, unlike quenching and tempering steels. * **Excellent Fabricability:** Can be machined, welded, and formed in the soft, solution-annealed condition prior to final age-hardening. * **Dimensional Stability:** Exhibits minimal distortion and volume change during the aging process. --- #### **Chemical Composition (Typical Weight %)** The composition is precisely controlled to achieve the optimal balance of strength and toughness. | 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) * **Thermal Expansion Coefficient:** 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)** *These are typical values for aged material and can be tailored based on 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 4D)** | 8 - 12 % | Aged | | **Reduction of Area** | 35 - 50 % | Aged | | **Hardness** | 54 - 57 HRC | Aged | | **Fracture Toughness (K_Ic)** | 55 - 80 MPa√m | Aged | *Note: In the solution-annealed condition, the material is much softer (~28-32 HRC), making it suitable for machining and fabrication.* --- #### **International Standards & Specifications** Maraging 350 is covered by several international aerospace and military standards. It is crucial to specify the required standard for procurement. * **AMS (Aerospace Material Specification):** * **AMS 6521:** Covers sheet, strip, and plate. * *(Note: While a specific AMS for pipe may not be as common, the material is often supplied to the chemistry and heat-treated properties of AMS 6521 for tubular products.)* * **ASTM (American Society for Testing and Materials):** * **ASTM A579 / A579M:** Standard Specification for Superstrength Alloy Steel Forgings. Certain grades within this standard cover maraging steels of similar strength levels. * **Proprietary/Manufacturer Specifications:** Many leading manufacturers produce Maraging C350 to their own proprietary specifications, which are often based on or exceed the requirements of the above standards. --- #### **Product Applications** Maraging C350 Pipes are utilized in critical, high-performance components across various advanced industries: * **Aerospace & Defense:** * **Rocket Motor Casings:** For solid-fuel rockets where high pressure containment is vital. * **Aircraft Landing Gear:** Components requiring high strength and fatigue resistance. * **Critical Airframe Structures:** High-stress members in military and space vehicles. * **Fasteners and Pins:** For highly loaded connections. * **Tooling and Industrial:** * **Extrusion Presses:** Mandrels and cylinders for aluminum and other metal extrusion. * **Injection Molding:** Cores and cavities for high-pressure plastic molding. * **High-Performance Shafts and Spindles.** * **Racing & High-Performance Automotive:** * **Drivetrain Components:** Lightweight, high-strength drive shafts and suspension members. --- #### **Conclusion** Maraging C350 Pipe represents the pinnacle of ultra-high-strength steel technology. Its unique properties, derived from a nickel-martensite structure and precipitation hardening, make it the material of choice for engineers designing systems where failure is not an option. Whether for launching payloads into orbit, withstanding the immense forces in a high-performance tool, or enabling cutting-edge defense technology, Maraging C350 provides the reliable, robust performance required by the world's most demanding applications. --- **Disclaimer:** The information provided herein is for general reference purposes. Actual properties and specifications may vary depending on the manufacturer, heat treatment process, and specific product form. Always consult the manufacturer's data sheets for precise and project-critical information.

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 2641 gallon liquid totes Special package is available on request.