Maraging 300，Maraging C300 Tube，UNS K93160,E FORU

British Specs:，American Specs:AMS 6514 Bar, Tube and Forgings AMS 6521 Sheet, Strip and Plate MIL-S-46850 TYPE 4 ASTM A579 / AMS 6514 Powder，German Specs:WS 1.6354 WS 1.6358

### **Technical Data Sheet: Maraging Steel 300 / Maraging C300 Tube (UNS K93160)** --- #### **1. Product Overview** **Maraging Steel C300 Tube** (commercially designated as **Maraging 300 Tube**, **UNS K93160**) is a precision tubular product manufactured from ultra-high-strength maraging steel, designed for applications requiring the highest strength-to-weight ratio in hollow sections with tight dimensional tolerances and commercial optimization. This product combines the exceptional mechanical properties of Maraging 300 alloy with enhanced manufacturability, providing optimal solutions for aerospace, defense, and instrumentation applications where maximum strength, dimensional accuracy, and cost-effectiveness are critical. --- #### **2. Chemical Composition (Weight %)** | Element | Min (%) | Max (%) | Function | |---------|----------|----------|----------| | **Nickel (Ni)** | 18.00 | 19.00 | Matrix strengthening | | **Cobalt (Co)** | 8.50 | 9.50 | Solid solution strengthening | | **Molybdenum (Mo)** | 4.60 | 5.20 | Precipitation hardening | | **Titanium (Ti)** | 0.50 | 0.80 | 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:** 2,000-2,140 MPa (290-310 ksi) - **Yield Strength:** 1,930-2,070 MPa (280-300 ksi) - **Elongation:** 8-10% - **Hardness:** 52-56 HRC - **Fracture Toughness:** 50-70 MPa√m - **Fatigue Strength:** Excellent in cyclic pressure applications **B. Physical Properties** - **Density:** 8.00 g/cm³ - **Modulus of Elasticity:** 185 GPa - **Thermal Conductivity:** 18.0-20.0 W/m·K - **Thermal Expansion:** 10.4-10.9 × 10⁻⁶/°C --- #### **4. Product Specifications** **Tube Dimensions:** - **Outside Diameter:** 6-150 mm (0.25-6 inches) - **Wall Thickness:** 1-15 mm (0.04-0.6 inches) - **Length:** 1,000-6,000 mm (3-20 feet) - **Diameter Tolerance:** ±0.1 mm (precision grades) - **Wall Thickness Tolerance:** ±5% to ±10% - **Straightness:** ≤ 0.5 mm/m - **Surface Finish:** Smooth ID and OD surfaces **Available Conditions:** - Annealed (32-36 HRC) - Solution Treated - Aged (52-56 HRC) --- #### **5. Applications** **Aerospace & Defense:** - Rocket motor cases - Aircraft hydraulic tubing - Missile guidance components - Helicopter rotor shafts - Space vehicle structures **Precision Instrumentation:** - High-pressure measurement devices - Scientific instrument frames - Optical system mounting tubes - Vacuum chamber components - Laboratory equipment tubing **High-Performance Industrial:** - Racing vehicle drive shafts - Hydraulic cylinder barrels - Process control instrumentation - Medical device components - Semiconductor equipment --- #### **6. Standards & Specifications** | Organization | Standard | Description | |--------------|----------|-------------| | **AMS** | 6514 | Bars, Forgings, and Tubing | | **ASTM** | A538 | Grade 300 | | **ASTM** | A511 | Seamless Stainless Steel Mechanical Tubing | | **UNS** | K93160 | Unified Numbering System | --- #### **7. Heat Treatment Process** **Solution Annealing:** - **Temperature:** 820 ± 10°C (1,508 ± 18°F) - **Time:** 1 hour per 25 mm wall thickness - **Cooling:** Air cool - **Hardness:** 32-36 HRC **Aging Treatment:** - **Temperature:** 480 ± 5°C (896 ± 9°F) - **Time:** 3-8 hours - **Cooling:** Air cool - **Hardness:** 52-56 HRC --- #### **8. Fabrication & Machining** **Precision Machining:** - Machine in solution-annealed state - Carbide tools with sharp cutting edges - Capable of holding tight tolerances - Excellent surface quality achievable **Forming & Bending:** - Minimum bend radius 2x tube diameter - Mandrel bending recommended - Predictable springback - Heat treatment after severe forming --- #### **9. Quality Assurance** **Testing Protocol:** - Dimensional verification - Ultrasonic testing - Surface quality examination - Straightness verification - Pressure testing available **Quality Features:** - Full traceability - Eddy current testing - Hydrostatic testing - Metallurgical analysis - Complete certification --- **Packaging & Handling:** - Individual protective packaging - Special care to prevent damage - Clear identification marking - Custom cutting services **Contact:** [Your Company Information] *Note: Maraging C300 Tube offers commercial optimization with enhanced manufacturability while maintaining the highest strength characteristics of the maraging steel family. All mechanical properties are typical for material in the fully aged condition. Specific performance characteristics should be verified for critical applications. Consult technical team for detailed engineering 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 2629 gallon liquid totes Special package is available on request.