Latrobe Marvac 300 VIM-VAR ; 6.25 in. High Strength Maraging Steel

Latrobe Marvac 300 VIM-VAR ; 6.25 in. High Strength Maraging Steel Product Information -:- For detailed product information, please contact sales. -: Latrobe Marvac 300 VIM-VAR ; 6.25 in. High Strength Maraging Steel Synonyms -:- For detailed product information, please contact sales. -:

Latrobe Marvac 300 VIM-VAR ; 6.25 in. High Strength Maraging Steel Product Information -:- For detailed product information, please contact sales. -: **Product Name:** Latrobe Marvac 300 VIM-VAR **Product Form:** Premium Melted Bar (6.25 inches in diameter) **Material Type:** High-Strength Maraging Steel --- ### **1. Overview** Latrobe Marvac 300 VIM-VAR is a premium-grade, high-strength maraging steel produced through advanced vacuum induction melting (VIM) followed by vacuum arc remelting (VAR). This double-melt process ensures exceptional purity, homogeneity, and superior mechanical properties. With a nominal yield strength of 300 ksi (2068 MPa), it is designed for the most demanding applications where ultra-high strength, excellent toughness, and good fabricability are critical. ### **2. Chemical Composition (Typical Weight %)** | Element | Content (%) | Element | Content (%) | |---------|------------|---------|------------| | **Iron (Fe)** | Balance | **Cobalt (Co)** | 8.0 - 9.0 | | **Nickel (Ni)**| 18.0 - 19.0 | **Molybdenum (Mo)**| 4.0 - 5.0 | | **Titanium (Ti)**| 0.5 - 0.8 | **Aluminum (Al)**| 0.05 - 0.15 | | **Carbon (C)** | ≤ 0.03 | **Manganese (Mn)**| ≤ 0.10 | | **Silicon (Si)**| ≤ 0.10 | **Sulfur (S)** | ≤ 0.01 | | **Phosphorus (P)**| ≤ 0.01 | **Boron (B)** | ≤ 0.003 | | **Zirconium (Zr)**| ≤ 0.01 | **Calcium (Ca)** | ≤ 0.05 | **Note:** The composition is tightly controlled to minimize impurities and optimize aging response. ### **3. Physical & Mechanical Properties** *Note: Properties are typical for material in the aged condition (aged at 480°C / 900°F for 3-5 hours).* - **Tensile Strength:** 300 - 310 ksi (2068 - 2137 MPa) - **Yield Strength (0.2% Offset):** 290 - 300 ksi (1999 - 2068 MPa) - **Elongation:** 10 - 12% - **Reduction in Area:** 50 - 55% - **Hardness:** 52 - 54 HRC - **Fracture Toughness (K_IC):** High (typically > 80 ksi√in) - **Density:** 0.290 lb/in³ (8.03 g/cm³) - **Melting Point:** ~ 1440°C (2625°F) ### **4. Key Characteristics** - **Ultra-High Strength-to-Weight Ratio:** Ideal for weight-critical designs. - **Excellent Toughness:** Maintains good fracture toughness at high strength levels. - **Good Fabricability:** Can be machined and formed in the solution-annealed (soft) condition, then aged to high strength. - **Dimensional Stability:** Minimal distortion during aging due to low-carbon martensitic transformation. - **Superior Purity & Homogeneity:** VIM-VAR melting reduces inclusions and segregation, enhancing fatigue life and reliability. ### **5. Product Applications** This material is specified for extreme performance applications, including: - **Aerospace:** Critical structural components, landing gear parts, rocket motor cases, helicopter drive systems, and arrestor hooks. - **Defense:** Missile and ordnance components, armor-piercing penetrators, submarine components. - **Racing & High-Performance:** Formula One and motorsport connecting rods, transmission parts. - **Tooling & Dies:** High-strength die-casting and injection molding dies requiring excellent thermal fatigue resistance. - **Specialty Fasteners:** Ultra-high-strength bolts, pins, and fasteners for critical assemblies. ### **6. International Standards & Specifications** Latrobe Marvac 300 VIM-VAR meets or exceeds the requirements of the following standards: - **AMS (Aerospace Material Specification):** AMS 6512 (Maraging Steel, 18.5Ni-9.0Co-4.9Mo-0.60Ti, Vacuum Melted, 300 ksi (2068 MPa) Yield Strength) - **ASTM (American Society for Testing and Materials):** ASTM A579 (Standard Specification for Superstrength Alloy Steel Forgings) - **U.S. Military Standard:** MIL-S-46850 / MIL-DTL-46850 (Maraging Steel, 18 Percent Nickel Alloy) - **European / ISO Standards:** Can be supplied to comparable international norms such as **EURONORM** or proprietary OEM specifications (e.g., Airbus, Boeing material codes). ### **7. Available Forms & Processing** - **Form:** 6.25-inch diameter round bars (other sizes available per request). - **Condition:** Typically supplied in the solution annealed condition (soft, ~ 30-34 HRC) for machining, followed by final aging by the customer to achieve full strength. - **Heat Treatment:** Solution treat at 820°C (1500°F), air cool, then age at 480°C (900°F) for 3-5 hours. ### **8. Why Choose Latrobe Marvac 300 VIM-VAR?** Latrobe Speciality Metals, a recognized leader in premium melt technology, ensures this product delivers **consistent, reliable performance** for mission-critical applications. The VIM-VAR process provides a clean, uniform microstructure, resulting in superior fatigue resistance, ductility, and transverse properties compared to standard melt products. --- **Disclaimer:** This data is for informational purposes. Specifications and standards should be verified with the manufacturer for the specific procurement contract. Final material properties are dependent on exact processing history and heat treatment. -:- For detailed product information, please contact sales. -: Latrobe Marvac 300 VIM-VAR ; 6.25 in. High Strength Maraging Steel Specification Dimensions Size： Diameter 20-1000 mm Length <7378 mm Size:We can customized as required Standard： Per your request or drawing We can customized as required Properties（Theoretical） Chemical Composition -:- For detailed product information, please contact sales. -: Latrobe Marvac 300 VIM-VAR ; 6.25 in. High Strength Maraging Steel Properties -:- For detailed product information, please contact sales. -:

Applications of Latrobe Marvac 300 VIM-VAR ; 6.25 in. High Strength Maraging Steel -:- For detailed product information, please contact sales. -: Chemical Identifiers Latrobe Marvac 300 VIM-VAR ; 6.25 in. High Strength Maraging Steel -:- For detailed product information, please contact sales. -:

Packing of Latrobe Marvac 300 VIM-VAR ; 6.25 in. High Strength Maraging Steel -:- For detailed product information, please contact sales. -: Standard Packing: -:- For detailed product information, please contact sales. -: 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 3849 gallon liquid totes Special package is available on request. E FORUs’ is carefully handled to minimize damage during storage and transportation and to preserve the quality of our products in their original condition