Alloy 45,Low expansion 45 Alloy Tube,,E FORU

British Specs:，American Specs:，German Specs:

**PRODUCT DATASHEET: ALLOY 45 / LOW EXPANSION 45 ALLOY TUBE** **Precision Tubing Products** --- ### **1. OVERVIEW** **Alloy 45**, commercially known as **Low Expansion 45 Alloy**, is a specialized **nickel-iron alloy** containing **45% nickel** that provides a **controlled coefficient of thermal expansion (CTE)** between traditional low-expansion alloys and standard tubing materials. Supplied in **precision tubing** form, this product offers exceptional dimensional stability and thermal performance for applications requiring intermediate expansion characteristics with precise geometrical control. --- ### **2. CHEMICAL COMPOSITION (Weight %)** | Element | Alloy 45 Tube Specification | Typical Range | |------------------|-----------------------------|---------------| | **Nickel (Ni)** | 44.0 – 46.0% | 44.5 – 45.5% | | **Iron (Fe)** | Balance | Balance | | **Manganese (Mn)**| 0.30 – 0.70% | 0.40 – 0.60% | | **Silicon (Si)** | 0.15 – 0.30% | 0.20 – 0.25% | | **Carbon (C)** | ≤ 0.05% | ≤ 0.03% | | **Chromium (Cr)**| ≤ 0.15% | ≤ 0.10% | | **Copper (Cu)** | ≤ 0.05% | ≤ 0.03% | | **Aluminum (Al)**| ≤ 0.05% | ≤ 0.03% | | **Sulfur (S)** | ≤ 0.015% | ≤ 0.010% | | **Phosphorus (P)**| ≤ 0.015% | ≤ 0.010% | --- ### **3. PHYSICAL & MECHANICAL PROPERTIES** | Property | Seamless Tube (Annealed) | Welded & Drawn Tube | |---------------------------------|--------------------------|---------------------| | **CTE (20–300°C)** | 6.5 – 7.5 × 10⁻⁶/°C | 6.5 – 7.5 × 10⁻⁶/°C | | **Density** | 8.17 g/cm³ | 8.17 g/cm³ | | **Melting Point** | 1425 – 1450°C | 1425 – 1450°C | | **Tensile Strength** | 530 – 630 MPa | 520 – 620 MPa | | **Yield Strength (0.2% Offset)**| 280 – 380 MPa | 270 – 370 MPa | | **Elongation (in 2")** | 25 – 35% | 23 – 33% | | **Modulus of Elasticity** | 148 GPa | 148 GPa | | **Hardness (Rockwell B)** | 70 – 85 HRB | 68 – 83 HRB | | **Electrical Resistivity** | 0.80 μΩ·m | 0.80 μΩ·m | | **Thermal Conductivity** | 15.0 W/m·K | 15.0 W/m·K | --- ### **4. INTERNATIONAL STANDARDS & EQUIVALENTS** | Standard Organization | Designation & Specification | |-----------------------|----------------------------| | **Proprietary** | Alloy 45, Nilo 45 | | **Custom Standards** | Customer-specific specifications | | **Similar Standards** | Based on ASTM B725 framework | | **European** | Similar to Ni45Fe series | | **Japanese** | Similar to C45N series | --- ### **5. TUBE SPECIFICATIONS** #### **5.1 Seamless Tube** - **Outside Diameter**: 1.5 mm to 40 mm - **Wall Thickness**: 0.3 mm to 4.0 mm - **OD Tolerance**: ±0.03 mm to ±0.08 mm - **Wall Tolerance**: ±10% - **Length**: 1.0 to 6.0 meters #### **5.2 Welded & Drawn Tube** - **Outside Diameter**: 4 mm to 60 mm - **Wall Thickness**: 0.4 mm to 3.0 mm - **OD Tolerance**: ±0.05 mm to ±0.10 mm - **Wall Tolerance**: ±10% - **Weld Quality**: Fully annealed and normalized #### **5.3 Surface Finish & Condition** - **Surface Finish**: Bright annealed, pickled, or polished - **Straightness**: 1:1000 maximum - **Roundness**: Within OD tolerance - **End Finish**: Square cut, deburred, chamfered --- ### **6. PRODUCT APPLICATIONS** #### **6.1 Thermal Management Systems** - **Heat Exchanger Tubes**: Intermediate expansion applications - **Thermal Sensor Housings**: Temperature measurement systems - **Cooling Jackets**: Electronic equipment cooling - **Heat Transfer Tubes**: Precision thermal control systems #### **6.2 Instrumentation & Controls** - **Pressure Sensor Tubes**: Instrumentation and control systems - **Capillary Tubes**: Precision fluid handling applications - **Optical Instrument Tubes**: Alignment and structural components - **Laboratory Apparatus**: Research equipment tubing #### **6.3 Semiconductor & Electronics** - **Gas Distribution Tubes**: Specialized process gas handling - **Vacuum Chamber Components**: Intermediate CTE requirements - **Wafer Processing Tubes**: Semiconductor manufacturing equipment - **Electronic Package Components**: Custom package elements #### **6.4 Medical & Aerospace** - **Medical Instrument Tubes**: Precision medical device components - **Aerospace Hydraulic Lines**: Intermediate expansion applications - **Guidance System Components**: Precision aerospace tubing - **Cryogenic Instrumentation**: Low temperature measurement systems --- ### **7. TECHNICAL SPECIFICATIONS** #### **7.1 Dimensional Standards** - **OD Control**: Precision drawn to size with tight tolerances - **Wall Uniformity**: Consistent wall thickness throughout length - **Length Tolerance**: ±1.0 mm for cut lengths - **Concentricity**: 90% minimum wall concentricity #### **7.2 Temperature Performance** - **Cryogenic Service**: Maintains properties down to -150°C - **Room Temperature**: Optimal CTE performance range - **Elevated Temperature**: Service up to 450°C - **Thermal Cycling**: Excellent fatigue resistance #### **7.3 Fabrication Compatibility** - **Bending**: Minimum bend radius 2× OD - **Flaring**: Compatible with standard flaring tools - **Beading**: Suitable for bead forming operations - **Swaging**: Can be reduced or expanded as required --- ### **8. FABRICATION & PROCESSING** #### **8.1 Cutting & Machining** - **Cutting Methods**: Band saw, abrasive cutter, laser cutting - **Deburring**: Essential for all cut ends - **Machining**: Suitable for threading and grooving - **Cleanliness**: Critical for high-purity applications #### **8.2 Welding & Joining** - **Welding Process**: GTAW (TIG) and laser welding - **Filler Metal**: Matching composition recommended - **Joint Preparation**: Precision fit-up required - **Purge Gas**: Internal purge for quality welds #### **8.3 Bending & Forming** - **Bend Methods**: Mandrel bending for tight radii - **Springback**: Approximately 2-3 degrees - **Tooling**: Hardened tooling recommended - **Inspection**: Profile projection for verification --- ### **9. QUALITY ASSURANCE** #### **9.1 Material Certification** - **Chemical Analysis**: Certified spectrographic analysis - **Mechanical Testing**: Tensile and hardness certification - **Dimensional Report**: Full dimensional verification - **Surface Quality**: Per customer requirements #### **9.2 Testing & Inspection** - **Eddy Current Testing**: 100% for defect detection - **Hydrostatic Testing**: Available for pressure applications - **Ultrasonic Testing**: For wall thickness verification - **Visual Inspection**: 100% surface examination #### **9.3 Cleanliness & Packaging** - **Cleanroom Packaging**: Available for critical applications - **End Protection**: Plastic caps for both ends - **Surface Protection**: VCI paper or plastic sleeve - **Identification**: Permanent marking per specification --- ### **10. TECHNICAL ADVANTAGES** - **Controlled Thermal Expansion**: Intermediate CTE for specialized applications - **Precision Dimensional Control**: Tight tolerances for critical applications - **Excellent Surface Quality**: Suitable for high-purity applications - **Good Fabricability**: Can be bent, formed, and welded easily - **Thermal Stability**: Maintains performance across temperature ranges - **Custom Sizes**: Available in various diameters and wall thicknesses --- **Note:** Alloy 45 tube is typically supplied against specific customer requirements. For applications involving extreme temperatures, high pressures, or specialized fabrication, consultation with our technical team is recommended. Custom testing and certification services available to meet specific application needs.

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 2473 gallon liquid totes Special package is available on request.