Maraging 350，Vascomax C350 ，,E FORU

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

**Product Technical Specification: Maraging 350 / Vascomax® C350** **Overview** Maraging 350, commercially known as Vascomax® C350, represents the pinnacle of ultra-high-strength maraging steel technology. This premium-grade, low-carbon iron-nickel martensitic steel achieves its exceptional mechanical properties through a unique age-hardening process that precipitates intermetallic compounds within a soft, ductile martensitic matrix. The "350" designation indicates its nominal yield strength of 350 ksi (approximately 2413 MPa), making it the strongest commercially available grade in the maraging steel family. **Key Characteristics & Advantages** - **Ultimate Strength-Toughness Combination:** Highest strength level in commercial maraging steels with exceptional fracture toughness - **Superior Thermal Stability:** Maintains properties at elevated temperatures - **Excellent Fabricability:** Can be machined, welded, and formed in solution-annealed condition - **Minimal Distortion:** Low-temperature aging process ensures dimensional stability - **Outstanding Fatigue Resistance:** Superior performance under cyclic loading conditions - **Good Stress Corrosion Cracking Resistance:** Reliable performance in demanding environments **Chemical Composition (Typical Weight %)** | 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:** 1410-1420°C (2570-2590°F) - **Thermal Expansion Coefficient:** 10.2 × 10⁻⁶/°C (20-100°C) - **Thermal Conductivity:** 19.0 W/m·K at 20°C - **Modulus of Elasticity:** 185-190 GPa (27 × 10⁶ psi) - **Electrical Resistivity:** 0.70 μΩ·m at 20°C **Mechanical Properties (After Full Heat Treatment):** | 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** | 8-12% | Aged | | **Reduction of Area** | 35-50% | Aged | | **Hardness** | 54-57 HRC | Aged | | **Fracture Toughness (K_Ic)** | 55-80 MPa√m | Aged | | **Fatigue Strength** | Exceptionally High | Aged | *Solution-annealed condition: 28-32 HRC* **Heat Treatment Specifications** **Solution Annealing:** - Temperature: 820°C ± 10°C (1500°F ± 20°F) - Time: 1 hour per 25 mm (1 inch) of thickness - Cooling: Air cool or faster **Age Hardening:** - Temperature: 480°C ± 5°C (900°F ± 10°F) - Time: 3-6 hours (depending on section size) - Cooling: Air cool **International Standards & Specifications** **Aerospace Standards:** - **AMS 6521G:** Maraging Steel 350 Bars, Forgings, and Rings - **AMS 6519:** Maraging Steel 250 Sheet, Strip, and Plate - **MIL-S-8949:** Maraging Steel Plate, Sheet, and Strip **Proprietary Specifications:** - **Vascomax® C350:** Proprietary specifications by leading manufacturers - Customer-specific quality and testing requirements **Additional Standards:** - **ASTM A579/A579M:** Superstrength Alloy Steel Forgings - **AMS 2759/9:** Heat Treatment of Maraging Steels - **NASM 8848:** Ultrasonic Inspection Standards **Product Applications** **Aerospace & Defense:** - Rocket motor cases and launch vehicle components - Aircraft landing gear critical components - Missile bodies and structural members - Spacecraft structural framework and fittings - Helicopter rotor hubs and drive systems **High-Performance Tooling:** - Extrusion press rams and containers - Injection molding machine components - Die-casting cores and cavities - High-strength gears and shafts **Specialized Industrial:** - High-pressure vessel components - Nuclear fuel processing equipment - Centrifuge components - High-performance fasteners **Emerging Applications:** - Additive manufacturing powders - High-performance automotive components - Advanced sporting equipment - Critical medical device components **Quality Assurance & Testing** **Standard Testing Protocol:** - Chemical analysis verification - Mechanical property testing - Ultrasonic inspection per AMS 2631 - Magnetic particle or liquid penetrant inspection - Microstructural evaluation - Fracture toughness testing (when specified) **Additional Quality Features:** - Full traceability from melt to final product - Certified material test reports - NADCAP accredited testing available - Customized testing protocols **Fabrication Notes** **Machining:** - Optimal in solution-annealed condition - Requires rigid setups and sharp tooling - Produces continuous chips - Good surface finish achievable **Welding:** - Recommended in annealed condition - Use matching or over-matching filler metals - Post-weld aging required for full strength - All common welding methods applicable **Forming:** - Excellent formability in annealed condition - Consider springback in design - Power tools recommended for cutting **Conclusion** Maraging 350/Vascomax® C350 represents the ultimate achievement in ultra-high-strength steel technology, offering an unmatched combination of strength, toughness, and reliability. Its unique heat treatment characteristics and superior mechanical properties make it the material of choice for the world's most demanding applications in aerospace, defense, and high-performance industrial sectors. The material's proven performance in critical applications, combined with its excellent fabricability, ensures its continued position as the premier solution for engineering challenges where failure is not an option. --- **Disclaimer:** The information provided is for technical reference only. Specific properties may vary based on product form, size, and processing parameters. Always consult the manufacturer's technical data sheets and certified test reports for project-specific requirements. Vascomax® is a registered trademark of leading specialty steel manufacturers.

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 2651 gallon liquid totes Special package is available on request.