ASTM B444 is a standard specification set forth by the American Society for Testing and Materials (ASTM) for seamless and welded nickel-chromium-molybdenum-columbium alloys (UNS N06625) tubes that are commonly known as Inconel 625 tubes. Inconel 625 is a widely used corrosion and oxidation-resistant nickel alloy that offers excellent strength and toughness, making it suitable for various high-temperature and aggressive environments. This specification covers tubes of various sizes and thicknesses, intended for general corrosion-resistant and heat-resistant applications. The tubes may be produced through either hot or cold working processes. They are commonly used in industries such as chemical processing, aerospace, marine engineering, and oil and gas due to their exceptional mechanical properties and resistance to a range of corrosive substances.
ASTM B444 establishes the requirements for chemical composition, mechanical properties, dimensions, and tolerances of Inconel 625 tubes. The chemical composition of the alloy must conform to specified limits of elements such as nickel, chromium, molybdenum, iron, and niobium, among others. The mechanical properties, including tensile strength, yield strength, and elongation, must also meet predetermined standards to ensure the reliability and durability of the tubes. The standard provides guidelines for tube dimensions, including outside diameter, wall thickness, and length.
It also outlines the various methods of testing and inspection that the tubes must undergo, such as hydrostatic testing, non-destructive testing, and visual inspection, to ensure they meet the required quality standards. In summary, ASTM B444 sets the requirements for Inconel 625 tubes, detailing their chemical composition, mechanical properties, dimensions, and testing procedures. This standard ensures that the tubes are suitable for use in demanding environments where corrosion resistance, high-temperature strength, and reliability are crucial factors.
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Specification:
| Property | Specification |
| Standard | ASTM B444 |
| Material | Nickel-Chromium-Molybdenum-Columbium Alloy (Inconel 625) - UNS N06625 |
| Type | Seamless and Welded Tubes |
| Size Range | 1/8" - 2" (3.18mm - 50.8mm) OD |
| Wall Thickness Range | 0.015" - 0.148" (0.38mm - 3.76mm) |
| Length | Up to 40 ft (12.2 meters) |
| Applications | Chemical Processing, Aerospace, Marine Engineering, Oil and Gas, High-Temperature Environments |
Chemical Composition of ASTM B444 INCONEL 625 TUBES
| Element | Composition Range |
| Nickel (Ni) | Minimum 58.0% |
| Chromium (Cr) | 20.0 - 23.0% |
| Molybdenum (Mo) | 8.0 - 10.0% |
| Niobium (Nb) | 3.15 - 4.15% |
| Iron (Fe) | Maximum 5.0% |
| Carbon (C) | Maximum 0.10% |
| Silicon (Si) | Maximum 0.50% |
| Manganese (Mn) | Maximum 0.50% |
| Phosphorus (P) | Maximum 0.015% |
| Sulfur (S) | Maximum 0.015% |
| Aluminum (Al) | Maximum 0.40% |
| Titanium (Ti) | Maximum 0.40% |
Mechanical Properties of ASTM B444 INCONEL 625 TUBES
| Property | Minimum Value |
| Tensile Strength | ≥ 120 ksi (827 MPa) |
| Yield Strength | ≥ 60 ksi (414 MPa) |
| Elongation | ≥ 30% |
| Hardness | HRB 100 max (Rockwell B) |
Advantages of ASTM B444 INCONEL 625 TUBES
- Good general corrosion resistance and high strength
- Good sulfide stress corrosion resistance
- Resistance to chloride pitting and crevice corrosion
- Higher resistance to chloride stress corrosion cracking
- Easy to weld and conform
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Applications Industry
| Pharmaceutical Equipment | Chemical Equipment |
| Sea Water Equipment | Heat Exchangers |
| Heat Exchangers | Gas Processing |
| Condensers | Specialty Chemicals |
| Pulp and Paper Industry | Pharmaceuticals |
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