Special Metals,UDIMAR® alloy 300 Fe-Ni Maraging Steel Tube,Pipe

Special Metals UDIMAR® alloy 300 Fe-Ni Maraging Steel Tube Product Information -:- For detailed product information, please contact sales. -: Special Metals UDIMAR® alloy 300 Fe-Ni Maraging Steel Tube Synonyms -:- For detailed product information, please contact sales. -:

Special Metals UDIMAR® alloy 300 Fe-Ni Maraging Steel Product Information -:- For detailed product information, please contact sales. -: # Special Metals UDIMAR® alloy 300 ## Premium Fe-Ni Maraging Steel --- ### **Product Overview** **Special Metals UDIMAR® alloy 300** is a proprietary, high-performance **18% nickel-cobalt maraging steel** developed for ultra-high-strength applications in aerospace, defense, and tooling industries. As a member of the **UDIMAR®** family, this alloy represents the premium tier of maraging steels, characterized by exceptional cleanliness, precise compositional control, and guaranteed mechanical properties. Designed to achieve a nominal **300 ksi (≈2068 MPa) ultimate tensile strength** after standard precipitation hardening, UDIMAR® 300 offers an optimal balance of ultra-high strength, excellent fracture toughness, and good fabricability. It is typically supplied as vacuum-melted billet, bar, and forging stock for mission-critical components. --- ### **Chemical Composition (Weight %)** *Optimized 18Ni-300 chemistry with enhanced controls.* | Element | Specification Range | Typical (%) | Metallurgical Function | |---------|-------------------|-------------|------------------------| | **Nickel (Ni)** | 18.0 - 19.0 | 18.5 | Forms the tough, ductile lath martensite matrix; essential for base toughness. | | **Cobalt (Co)** | 8.5 - 9.5 | 9.0 | Critical driver for precipitation hardening; reduces solubility of Mo in martensite. | | **Molybdenum (Mo)** | 4.5 - 5.2 | 4.9 | Primary precipitation hardener; forms Ni₃Mo intermetallics. | | **Titanium (Ti)** | 0.5 - 0.8 | 0.65 | Secondary precipitation hardener; forms Ni₃Ti. | | **Aluminum (Al)** | 0.05 - 0.15 | 0.10 | Deoxidizer; contributes to grain refinement. | | **Carbon (C)** | ≤ 0.03 | 0.01 | Ultra-low for maximum toughness and weldability. | | **Manganese (Mn)** | ≤ 0.10 | 0.05 | Residual. | | **Silicon (Si)** | ≤ 0.10 | 0.05 | Residual. | | **Boron (B)** | 0.003 - 0.006 | 0.004 | Enhances hardenability and grain boundary strength. | | **Zirconium (Zr)** | 0.01 - 0.02 | 0.015 | Grain refiner; improves toughness. | | **Sulfur (S)** | ≤ 0.010 | 0.003 | Impurity control. | | **Phosphorus (P)** | ≤ 0.010 | 0.005 | Impurity control. | | **Iron (Fe)** | Balance | Balance | Base element. | **Premium Quality Features:** * **Melting Practice:** Typically **Vacuum Induction Melting (VIM)** or **VIM + Vacuum Arc Remelting (VAR)** for superior cleanliness and homogeneity. * **Inclusion Control:** Stringent limits on oxide and sulfide inclusions per ASTM E45. --- ### **Standard Heat Treatment** 1. **Solution Annealing:** * **Temperature:** **815°C - 830°C (1500°F - 1525°F)** * **Time:** 1 hour per inch of thickness (minimum 1 hour) * **Cooling:** Air Cool * **Resulting Condition:** Soft martensite (~30 HRC), ideal for machining and forming. 2. **Aging (Precipitation Hardening):** * **Temperature:** **480°C ± 5°C (900°F)** * **Time:** 3 - 6 hours (typically 3-4 hours for sections < 50mm) * **Cooling:** Air Cool * **Resulting Condition:** Peak-aged maraging steel with optimal strength-toughness balance. --- ### **Mechanical Properties (After Full Heat Treatment - Longitudinal)** *Minimum guaranteed or typical values for premium material.* | Property | Minimum Guaranteed | Typical Achieved | Test Standard | |----------|-------------------|------------------|---------------| | **Ultimate Tensile Strength (UTS)** | 2000 MPa (290 ksi) | 2050 - 2150 MPa (297 - 312 ksi) | ASTM E8 | | **0.2% Yield Strength (YS)** | 1900 MPa (276 ksi) | 1950 - 2050 MPa (283 - 297 ksi) | ASTM E8 | | **Elongation (in 50 mm)** | 8% | 10 - 12% | ASTM E8 | | **Reduction of Area** | 45% | 50 - 60% | ASTM E8 | | **Hardness** | 50 HRC | 52 - 54 HRC | ASTM E18 | | **Fracture Toughness (K_IC)** | **70 MPa√m** | 75 - 95 MPa√m | ASTM E399 | | **Impact Energy (Charpy V)** | 25 J | 30 - 45 J | ASTM E23 | | **Modulus of Elasticity** | 180 GPa | 185 - 190 GPa | ASTM E111 | **Key Performance Characteristics:** * **Optimal Strength-Toughness Balance:** The hallmark of the 300-grade maraging steel. Provides the best practical combination for most ultra-high-strength applications. * **Excellent Fatigue Strength:** Good resistance to crack initiation with proper surface finish. * **Good Stress Corrosion Cracking Resistance:** Superior to many other ultra-high-strength steels. --- ### **Physical Properties (Aged Condition)** | Property | Value (20°C) | |----------|--------------| | **Density** | 8.01 g/cm³ (0.289 lb/in³) | | **Melting Range** | 1410 - 1440°C (2570 - 2625°F) | | **Thermal Conductivity** | 19 - 21 W/(m·K) | | **Coefficient of Thermal Expansion** | 10.5 x 10⁻⁶/°C (20-100°C) | | **Electrical Resistivity** | 0.60 - 0.65 μΩ·m | | **Magnetic Properties** | Ferromagnetic (martensitic) | --- ### **Key Advantages of UDIMAR® 300** * **Premium Quality Assurance:** Stringent melting and processing controls ensure exceptional consistency and reliability. * **Excellent Fabricability in Annealed Condition:** Can be readily machined, formed, and welded before final aging. * **Simple Heat Treatment:** Low-temperature aging minimizes distortion and simplifies processing of complex parts. * **Dimensional Stability:** Predictable, minimal growth (~0.05%) during aging enables precision manufacturing. * **Proven Reliability:** Extensive history in critical aerospace applications. --- ### **International Standards & Designations** * **Proprietary Alloy:** UDIMAR® alloy 300 is a trademarked product of **Special Metals Corporation** (PCC Family). * **Equivalent Standards:** Meets or exceeds requirements of: * **AMS 6521** (Steel Bars, Forgings, and Tubing 18.5Ni-9.0Co-4.9Mo-0.65Ti) * **ASTM A538 Grade B** * **ISO 683-13** (X2NiCoMo18-9-5) * **Common Industry Names:** 18Ni-300, Maraging 300, VascoMax 300. * **UNS Designation:** **K92890** --- ### **Primary Applications** UDIMAR® 300 is specified for the most demanding structural applications where weight savings and reliability are critical: 1. **Aerospace & Defense:** * **Rocket and Missile Motor Cases** (solid and liquid fuel) * **Aircraft Landing Gear Components:** Forgings for struts, beams, pistons, and linkages * **Helicopter Rotor Hubs and Drive Shafts** * **Satellite and Spacecraft Structures:** Booms, fittings, deployment mechanisms 2. **Tooling & Industrial:** * **High-Performance Injection Molds** with conformal cooling * **Die Casting Dies and Inserts** for aluminum and magnesium * **Extrusion Dies and Mandrels** for titanium and superalloys * **Isostatic Press Tooling** 3. **High-Performance Automotive & Racing:** * **Critical Fasteners** (connecting rod bolts, head studs) * **Suspension and Drivetrain Components** 4. **Energy Sector:** * **Components for High-Pressure Isostatic Pressing** * **Downhole Tooling** for oil and gas --- ### **Fabrication Guidelines** * **Machining:** Best performed in **solution-annealed condition** (~30 HRC). Use positive rake carbide tools with adequate cooling. * **Forming:** All significant forming should be completed before final aging. * **Welding:** Use **GTAW (TIG)** with matching filler (e.g., ER18Ni). **Full post-weld heat treatment** (solution + age) is required for critical applications. * **Heat Treatment:** Precise temperature control (±5°C) during aging is essential for consistent properties. * **Corrosion Protection:** **Not stainless.** Requires protective coatings: electroless nickel, cadmium plating (with post-plate bake), or specialized paint systems. --- ### **Comparison with Similar Materials** | Property | **UDIMAR® 300** | **4340M Steel** (260-280 ksi) | **AerMet® 100** | |----------|-----------------|-------------------------------|-----------------| | **Strengthening** | Precipitation | Quench & Temper | Quench & Temper + Aging | | **Typical YS** | 1950-2050 MPa | 1790-1930 MPa | 1725-1790 MPa | | **Fracture Toughness** | **Excellent (75-95 MPa√m)** | Moderate (50-65 MPa√m) | High (110-130 MPa√m) | | **Weldability** | Good (with PWHT) | Poor | Fair (with PWHT) | | **Aging Distortion** | Very Low | High (Quench Cracks) | High | | **Key Advantage** | **Best Overall Balance** | **Lower Cost** | **Highest Toughness** | --- ### **Quality Assurance** * **Material Certification:** Supplied with full traceability and **EN 10204 3.1/3.2** certification. * **Testing:** Comprehensive testing including chemical analysis, mechanical properties, non-destructive testing (UT, MPI), and microcleanliness evaluation. * **Lot Control:** Each heat lot is individually tracked and tested. --- ### **Summary** **Special Metals UDIMAR® alloy 300** represents the **premium commercial offering** in the 18Ni-300 maraging steel category. It combines the **well-established, optimized chemistry** of this high-performance material class with the **enhanced quality controls and reliability** expected from a specialty metals producer. For engineers and manufacturers requiring the **proven performance of 300-grade maraging steel** with the **additional assurance of premium material consistency**, UDIMAR® 300 provides an excellent solution. It is particularly well-suited for **mission-critical aerospace and defense applications** where material reliability is as important as the documented mechanical properties. While functionally equivalent to other high-quality 18Ni-300 materials, the UDIMAR® brand signifies a commitment to the highest standards of production and quality control in this demanding material sector. -:- For detailed product information, please contact sales. -: Special Metals UDIMAR® alloy 300 Fe-Ni Maraging Steel Specification Dimensions Size： Diameter 20-1000 mm Length <7373 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. -: Special Metals UDIMAR® alloy 300 Fe-Ni Maraging Steel Properties -:- For detailed product information, please contact sales. -:

Applications of Special Metals UDIMAR® alloy 300 Fe-Ni Maraging Steel Tube -:- For detailed product information, please contact sales. -: Chemical Identifiers Special Metals UDIMAR® alloy 300 Fe-Ni Maraging Steel Tube -:- For detailed product information, please contact sales. -:

Packing of Special Metals UDIMAR® alloy 300 Fe-Ni Maraging Steel Tube -:- 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 Tube 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 3844 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