Maraging 350，Maraging C350 ，,E FORU

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

### **Technical Data Sheet: Maraging Steel 350 / Maraging C350** --- #### **1. Product Overview** **Maraging Steel C350** (commercially designated as **Maraging 350**) represents the ultra-high-strength grade in the maraging steel family, offering the highest combination of strength and toughness among standard maraging grades. This martensitic age-hardening steel achieves exceptional mechanical properties through a precipitation hardening mechanism, providing superior performance for the most demanding aerospace, defense, and tooling applications where maximum strength and reliability are critical. --- #### **2. Chemical Composition (Weight %)** | Element | Min (%) | Max (%) | Function | |---------|----------|----------|----------| | **Nickel (Ni)** | 18.00 | 19.00 | Matrix strengthening | | **Cobalt (Co)** | 11.50 | 12.50 | Solid solution strengthening | | **Molybdenum (Mo)** | 4.60 | 5.20 | Precipitation hardening | | **Titanium (Ti)** | 1.30 | 1.60 | Primary age-hardening | | **Aluminum (Al)** | 0.05 | 0.15 | Secondary age-hardening | | **Carbon (C)** | - | 0.03 | Impurity control | | **Iron (Fe)** | - | - | Balance | --- #### **3. Mechanical & Physical Properties** **A. Mechanical Properties (Aged Condition)** - **Tensile Strength:** 2,340-2,480 MPa (340-360 ksi) - **Yield Strength:** 2,240-2,380 MPa (325-345 ksi) - **Elongation:** 6-8% - **Reduction in Area:** 35-45% - **Hardness:** 56-60 HRC - **Fracture Toughness:** 35-50 MPa√m - **Impact Toughness:** 10-20 J **B. Physical Properties** - **Density:** 8.10 g/cm³ - **Modulus of Elasticity:** 185 GPa - **Thermal Conductivity:** 17.0-19.0 W/m·K - **Thermal Expansion:** 10.2-10.7 × 10⁻⁶/°C --- #### **4. Product Forms & Applications** **Available Product Forms:** - Bar (Round, Flat, Square) - Plate and Sheet - Wire and Rod - Forgings - Tubular products **Aerospace Applications:** - Rocket motor cases - Aircraft landing gear components - Missile structures - Space vehicle components - Helicopter rotor systems **Tooling Applications:** - High-pressure die casting tools - Precision molds - Extrusion press components - Injection molding screws - Special tooling --- #### **5. Standards & Specifications** | Organization | Standard | Description | |--------------|----------|-------------| | **AMS** | 6526 | Grade 350 Maraging Steel | | **ASTM** | A538 | Grade 350 | | **MIL** | S-46850 | Maraging Steel Grade 350 | --- #### **6. Heat Treatment Process** **Solution Annealing:** - **Temperature:** 820 ± 10°C (1,508 ± 18°F) - **Time:** 1 hour per 25 mm thickness - **Cooling:** Air cool - **Hardness:** 32-36 HRC **Aging Treatment:** - **Temperature:** 480 ± 5°C (896 ± 9°F) - **Time:** 3-6 hours - **Cooling:** Air cool - **Hardness:** 56-60 HRC --- #### **7. Fabrication Characteristics** **Machining:** - Good machinability in annealed condition - Carbide tools recommended - Adequate coolant required - Grinding preferred in aged condition **Welding:** - Good weldability with proper procedures - TIG and plasma arc welding suitable - Post-weld heat treatment required - Matching filler metal recommended --- #### **8. Quality Assurance** **Testing & Certification:** - Chemical analysis certification - Mechanical testing - Non-destructive testing - Full traceability - Quality system certification --- #### **9. Technical Advantages** **Performance Benefits:** - Highest strength in maraging steel family - Excellent strength-to-weight ratio - Good dimensional stability - Simple heat treatment process - Superior fatigue performance --- **Contact:** [Your Company Information] *Note: Maraging C350 offers the highest strength characteristics in the standard maraging steel family with commercial optimization for enhanced manufacturability. All mechanical properties are typical for material in the fully aged condition. Consult technical team for specific application requirements.*

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 2638 gallon liquid totes Special package is available on request.