Maraging 250,Vascomax C250 Tube,UNS K92940,E FORU

British Specs:BS S162，American Specs:AMS 6512 Bar, Tube, Forgings AMS 6520 Sheet, Strip and Plate ASTM A646 MIL-S-46850 Type 3，German Specs:WS 1.6359

### **Technical Data Sheet: Maraging 250 / Vascomax C250 Tube (UNS K92940)** --- #### **1. Product Overview** **Vascomax C250 Tube** (commercially designated as **Maraging 250 Tube**, **UNS K92940**) is a precision tubular product manufactured from ultra-high-strength maraging steel, designed for applications requiring exceptional strength-to-weight ratio in hollow sections with tight dimensional tolerances. This product combines the superior mechanical properties of Vascomax C250 alloy with the precision of tubular manufacturing, providing optimal solutions for aerospace, defense, and instrumentation applications where reliability and dimensional accuracy are paramount. --- #### **2. Chemical Composition (Weight %)** | Element | Min (%) | Max (%) | Function | |---------|----------|----------|----------| | **Nickel (Ni)** | 18.00 | 19.00 | Matrix strengthening | | **Cobalt (Co)** | 7.00 | 7.50 | Solid solution strengthening | | **Molybdenum (Mo)** | 4.60 | 5.10 | Precipitation hardening | | **Titanium (Ti)** | 0.40 | 0.50 | Primary age-hardening | | **Aluminum (Al)** | 0.05 | 0.10 | Secondary age-hardening | | **Carbon (C)** | - | 0.03 | Impurity control | | **Iron (Fe)** | - | - | Balance | --- #### **3. Mechanical & Physical Properties** **A. Mechanical Properties (Aged Condition)** - **Tensile Strength:** 1,793-1,862 MPa (260-270 ksi) - **Yield Strength:** 1,724-1,793 MPa (250-260 ksi) - **Elongation:** 10-12% - **Hardness:** 50-54 HRC - **Fracture Toughness:** 75-95 MPa√m - **Fatigue Strength:** Excellent in cyclic pressure applications **B. Physical Properties** - **Density:** 8.00 g/cm³ - **Modulus of Elasticity:** 186 GPa - **Thermal Conductivity:** 20.0-22.0 W/m·K - **Thermal Expansion:** 10.6-11.1 × 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 (30-34 HRC) - Solution Treated - Aged (50-54 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** | 6512 | Bars, Forgings, and Tubing | | **ASTM** | A538 | Grade 250 | | **ASTM** | A511 | Seamless Stainless Steel Mechanical Tubing | | **UNS** | K92940 | Unified Numbering System | --- #### **7. Heat Treatment Process** **Solution Annealing:** - **Temperature:** 815-830°C (1,500-1,525°F) - **Time:** 1 hour per 25 mm wall thickness - **Cooling:** Air cool - **Hardness:** 30-34 HRC **Aging Treatment:** - **Temperature:** 480-495°C (895-925°F) - **Time:** 3-4 hours - **Cooling:** Air cool - **Hardness:** 50-54 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: Vascomax is a registered trademark of Carpenter Technology Corporation. All properties typical for aged condition. Consult technical team for specific application requirements.*

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 2603 gallon liquid totes Special package is available on request.