Maraging 350，Maraging C350 Other/Similar Specs，,E FORU

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

**Product Technical Brief: Maraging 350 / Maraging C350 & Related Specifications** **Overview** Maraging 350 (also designated as Maraging C350) represents the premium grade within the 18% nickel maraging steel family, distinguished by its nominal yield strength of 350 ksi (approximately 2413 MPa). This classification encompasses various product forms that share the fundamental metallurgical characteristics but may be specified under different standards or with slight variations to meet specific application requirements. This document provides a comprehensive overview of the Maraging 350 material system and its related specifications. **Material Family Characteristics** - **18% Nickel Maraging Steel Series:** Part of the 200, 250, 300, and 350 ksi yield strength progression - **Precipitation Hardening System:** Utilizes intermetallic compound formation (Ni₃Mo, Ni₃Ti) for strengthening - **Low-carbon Martensitic Structure:** Provides inherent toughness and ductility - **Heat Treatable:** Achieves final properties through simple aging treatment **Chemical Composition (Typical Weight %)** | Element | Maraging 350 | Similar Grades (250/300) | Function | |---------|-------------|-------------------------|-----------| | Nickel (Ni) | 18.0-19.0 | 17.0-19.0 | Matrix former, austenite suppressor | | Cobalt (Co) | 11.5-12.5 | 7.0-8.5 (300 grade) | Reduces Mo solubility, enhances precipitation | | Molybdenum (Mo) | 4.6-5.2 | 4.6-5.2 | Primary strengthening element | | Titanium (Ti) | 1.3-1.6 | 0.3-0.5 (250 grade) | Secondary strengthening element | | Carbon (C) | ≤0.03 | ≤0.03 | Maintains toughness | | Aluminum (Al) | 0.05-0.15 | 0.05-0.15 | Deoxidizer, grain refiner | **Related Specifications and Designations** **International Standards:** - **AMS 6521:** Maraging Steel 350 Bars, Forgings, Rings, and Plate - **AMS 6519:** Maraging Steel 250 Sheet, Strip, and Plate - **ASTM A579/A579M:** Superstrength Alloy Steel Forgings - **MIL-S-8949:** Maraging Steel Plate, Sheet, and Strip - **UNS K89320:** Unified Numbering System designation - **VascoMax T-250, C-300, X-1000:** Commercial equivalents from different manufacturers **Proprietary/Manufacturer Variants:** - Different heat treatment cycles for optimized properties - Custom chemical modifications for specific applications - Variants with improved weldability or corrosion resistance **Physical & Mechanical Properties Comparison** **Physical Properties:** - Density: 8.10 g/cm³ (0.292 lb/in³) - Melting Range: 1400-1420°C (2550-2590°F) - Thermal Conductivity: 19.0 W/m·K at 20°C - Electrical Resistivity: 0.70 μΩ·m at 20°C **Mechanical Properties by Grade:** | Property | Grade 250 | Grade 300 | Grade 350 | |----------|------------|------------|------------| | Yield Strength (MPa) | 1720-1790 | 2000-2100 | 2340-2410 | | Tensile Strength (MPa) | 1790-1860 | 2070-2170 | 2450-2550 | | Elongation (%) | 10-14 | 9-12 | 8-12 | | Fracture Toughness (MPa√m) | 90-110 | 70-90 | 55-80 | | Hardness (HRC) | 48-50 | 52-54 | 54-57 | **Specialized Applications by Industry** **Aerospace & Defense:** - Rocket motor cases and launch vehicle components - Aircraft landing gear and critical structural elements - Missile bodies and guidance system components - Spacecraft structural framework **Tooling & Industrial:** - Precision molds and dies for injection molding - Extrusion press rams and containers - High-strength gears and shafts - Machine tool components **Nuclear & Energy:** - Centrifuge components - Pressure vessel applications - High-strength fasteners and connectors **Emerging Applications:** - Additive manufacturing powders - High-performance automotive components - Advanced sporting equipment - Medical implant devices (special grades) **Heat Treatment Characteristics** **Solution Treatment:** - Temperature: 820°C ± 10°C (1500°F ± 20°F) - Time: 1 hour per 25mm of thickness - Cooling: Air cool or faster **Aging Treatment:** - Temperature: 480°C ± 5°C (900°F ± 10°F) - Time: 3-6 hours typically - Cooling: Air cool **Fabrication Notes** **Machining:** - Best performed in solution-annealed condition - Requires rigid setups and sharp tooling - Produces continuous chips **Welding:** - Can be welded in annealed condition - Requires matching or over-matching filler metals - Post-weld aging required for full strength **Forming:** - Good formability in annealed condition - Springback considerations important - Requires power tools for cutting **Quality Assurance & Testing** Standard testing includes: - Chemical analysis verification - Mechanical property testing - Non-destructive examination - Microstructural evaluation - Fracture toughness testing (when specified) **Technical Support & Customization** We provide: - Material selection assistance - Heat treatment optimization - Fabrication process development - Failure analysis and troubleshooting - Customized testing protocols **Conclusion** The Maraging 350 material system and its related specifications offer the highest strength-to-toughness combination in the commercial maraging steel family. While maintaining the fundamental advantages of the 18% nickel maraging steels - excellent fabricability, simple heat treatment, and dimensional stability - the 350 grade provides approximately 40% higher strength than the 250 grade. Understanding the complete family of specifications allows for optimal material selection based on specific application requirements, balancing strength, toughness, cost, and availability. --- **Note:** This document covers the general characteristics of the Maraging 350 material system. Specific requirements should be confirmed with the appropriate standard documentation and material certifications. Properties may vary based on product form, size, and processing history.

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 2648 gallon liquid totes Special package is available on request.