Maraging 350，Maraging C350 Bar(Round bar, Flat bar)，,E FORU

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

### **Technical Data Sheet: Maraging Steel 350 / Maraging C350 Bar (Round & Flat Bar)** --- #### **1. Product Overview** **Maraging Steel C350 Bar** (commercially designated as **Maraging 350 Bar**) is supplied in both round bar and flat bar configurations, providing versatile stock material for manufacturing critical components requiring the highest strength-to-weight ratio with commercial optimization. This product combines the exceptional mechanical properties of Maraging 350 alloy with enhanced manufacturability, offering optimal solutions for aerospace, defense, and tooling applications where maximum strength and reliability are paramount. --- #### **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 Specifications** **Round Bar:** - **Diameter Range:** 5-250 mm (0.2-10 inches) - **Diameter Tolerance:** h11 standard - **Straightness:** ≤ 1.5 mm/m - **Surface Finish:** Turned, ground, or polished **Flat Bar:** - **Thickness Range:** 5-120 mm (0.2-4.7 inches) - **Width Range:** 20-300 mm (0.8-12 inches) - **Thickness Tolerance:** ±0.1 to ±0.5 mm - **Squareness:** Maintained within 1° **Available Conditions:** - Annealed (32-36 HRC) - Aged (56-60 HRC) - Solution Treated --- #### **5. Applications** **Round Bar Applications:** - Rocket motor closures - Aircraft landing gear actuators - Precision shafts and spindles - High-strength fasteners - Die-casting machine components **Flat Bar Applications:** - Aircraft structural brackets - Tooling plates and mold bases - Machine frames and fixtures - Defense vehicle structural members - Precision ground stock **Common Applications:** - High-pressure die casting components - Extrusion press components - Helicopter rotor systems - Special machinery components - Optical mounting instruments --- #### **6. Standards & Specifications** | Organization | Standard | Description | |--------------|----------|-------------| | **AMS** | 6526 | Grade 350 Maraging Steel | | **ASTM** | A538 | Grade 350 | | **MIL** | S-46850 | Maraging Steel Grade 350 | --- #### **7. 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 --- #### **8. Machining & Fabrication** **Machining Guidelines:** - **Optimal Condition:** Annealed state (32-36 HRC) - **Tooling:** Carbide tools recommended - **Coolant:** Required for optimal results - **Threading:** Special tooling required **Fabrication Advantages:** - Minimal distortion during aging - Enhanced machinability in annealed condition - Good weldability with proper procedures - Maintains dimensional stability --- #### **9. Quality Assurance** **Testing & Certification:** - Chemical analysis certification - Mechanical testing from samples - Ultrasonic testing available - Dimensional verification - Full traceability documentation **Quality Standards:** - Aerospace quality (AS9100) - Nadcap accredited - Military compliance - Statistical process control --- **Packaging & Delivery:** - Protective packaging - Clear identification marking - Custom cutting services - Just-in-time delivery available **Contact:** [Your Company Information] *Note: Maraging C350 Bar offers commercial optimization with enhanced processability while maintaining the highest strength characteristics of the maraging steel family. All mechanical properties are typical for material in the fully aged condition. Properties may vary based on specific section size and heat treatment parameters. Consult our technical team for application-specific recommendations.*

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 2640 gallon liquid totes Special package is available on request.