Maraging 350，Maraging C350 Strip，,E FORU

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

### **Product Datasheet: Maraging 350 / Maraging C350 Precision Strip** #### **Overview** Maraging 350 (Maraging C350) Strip is an ultra-high-strength, low-carbon martensitic steel supplied in thin, precision-rolled strip form. Designed for the most demanding lightweight and compact components, this alloy achieves its remarkable properties through a unique age-hardening heat treatment. The "C350" denotes its nominal yield strength of 350 ksi (approximately 2413 MPa). In strip form, Maraging C350 offers exceptional strength, excellent fatigue resistance, and good fabricability, making it ideal for complex, high-stress parts where minimal weight and space are critical design parameters. #### **Key Characteristics & Advantages** * **Ultra-High Strength in Thin Sections:** Delivers exceptional yield and tensile strength even in very thin gauges, perfect for miniaturized components. * **Excellent Formability in Annealed State:** Can be readily blanked, pierced, stamped, and formed into complex shapes in the soft, solution-annealed condition. * **Superior Spring Properties:** After aging, it exhibits very high tensile elastic limits and excellent fatigue resistance, ideal for high-performance springs. * **Minimal Distortion During Aging:** The final age-hardening step induces minimal warping or dimensional change, crucial for maintaining the precision of stamped and formed parts. * **Good Surface Finish:** Capable of being supplied with a high-quality surface finish, suitable for critical exposed applications. --- #### **Chemical Composition (Typical Weight %)** The composition is meticulously balanced to ensure a consistent and robust age-hardening response in thin cross-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 strip material. Properties are thickness-dependent.* | 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)** | 4 - 8 % | Aged | | **Hardness** | 54 - 57 HRC | Aged | | **Fatigue Strength** | Exceptionally High | Aged | *Note: In the solution-annealed and cold-rolled condition (soft state), the strip is supplied with a hardness of ~30-36 HRC. This state is optimized for severe stamping, piercing, and other cold-forming operations.* --- #### **International Standards & Specifications** Maraging C350 Strip is produced to meet stringent international standards, particularly in aerospace and precision engineering. * **AMS (Aerospace Material Specification):** * **AMS 6521G:** This is the primary specification covering Maraging 350 in the form of Sheet, Strip, and Plate. It defines the chemical and mechanical property requirements. * **ASTM (American Society for Testing and Materials):** * **ASTM A693:** Standard Specification for Precipitation-Hardening Stainless and Maraging Steel Plate, Sheet, and Strip. While more common for PH stainless steels, it is a relevant standard for maraging strip. * **U.S. Military Standards:** * **MIL-S-8949:** A key governing specification for Maraging Steel Plate, Sheet, and Strip used in defense applications. * **Dimensional Standards:** * Strip is typically supplied to precision tolerances as per **ASTM A505** for steel strip or to customer-specific dimensional drawings, including strict requirements on thickness, width, and camber. --- #### **Product Applications** Maraging C350 Strip is specified for critical, thin-gauge components where its ultra-high strength is paramount: * **Precision Springs & Fasteners:** * **High-Performance Flat Springs:** For relays, electrical contacts, and instruments requiring high force in a minimal space. * **Spring Clips and Retainers:** In aerospace, automotive, and electronics where reliability under cyclic loading is critical. * **High-Strength Washers and Shims.** * **Aerospace & Defense:** * **Guidance System Components:** Precision parts in missiles and avionics. * **Small, High-Pressure Diaphragms and Bellows.** * **Lightweight Armor Components.** * **Electronics & Industrial Equipment:** * **Lead Frames** for high-reliability integrated circuits (in specific applications). * **Diaphragms for pressure sensors and transducers.** * **Drive Belts** for high-speed mechanisms. * **Medical Devices:** * **Surgical Tool Components:** Such as jaws for laparoscopic instruments, where strength, sharpness, and small size are required. * **Components in implantable medical devices.** --- #### **Fabrication Notes** * **Forming:** All severe stamping, bending, and forming must be completed in the soft, solution-annealed condition. * **Machining:** Machining is readily performed in the annealed state. * **Heat Treatment:** After fabrication, components are age-hardened at approximately 480°C (900°F) for 3-6 hours to achieve the final ultra-high strength. * **Welding:** Can be welded in the annealed condition using matching or compatible filler wire, followed by post-weld aging. #### **Conclusion** Maraging C350 Strip provides an unparalleled combination of ultra-high strength and precision fabricability in a thin, compact product form. Its ability to be transformed from a soft, formable metal into one of the strongest available materials makes it indispensable for designers of high-performance springs, precision aerospace components, and critical medical device parts. For applications where space and weight are at an absolute premium, Maraging C350 Strip offers a proven, high-reliability solution. --- **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 2645 gallon liquid totes Special package is available on request.