ASTM B983 UNS NO7022, UNS NO7725, UNS NO7740, UNS NO9945, UNS NO9925 Incoloy 925 Nickel Alloy Pipe
Cold Worked Seamless Nickel Alloy Pipe and Tube
Nickel alloys are essential in various industries due to their exceptional resistance to corrosion, high-temperature strength, and versatility. Among these, the ASTM B983 specification covers several nickel alloy grades, including UNS NO7022, UNS NO7725, UNS NO7740, UNS NO9945, and UNS NO9925. These alloys are particularly noted for their use in cold worked seamless nickel alloy pipes and tubes.
Material Specification
ASTM B983 outlines the standard specification for nickel alloy pipes and tubes, focusing on their seamless and cold worked nature. These materials are designed to withstand extreme environments, making them ideal for applications in the chemical, petrochemical, and oil and gas industries.
Key Features
- Corrosion Resistance: Excellent resistance to both oxidizing and reducing environments.
- High-Temperature Strength: Maintains mechanical properties at elevated temperatures.
- Versatility: Suitable for a wide range of applications due to its robust chemical composition.
- Durability: Long-lasting performance in harsh conditions.
Chemical Composition
The chemical composition of these nickel alloys is crucial for their performance. Below is a table presenting the typical composition for these alloys:
| Element |
UNS NO7022 |
UNS NO7725 |
UNS NO7740 |
UNS NO9945 |
UNS NO9925 |
| Nickel (Ni) |
50-55% |
55-60% |
60-65% |
65-70% |
70-75% |
| Chromium (Cr) |
18-22% |
20-23% |
22-25% |
23-26% |
24-27% |
| Iron (Fe) |
Balance |
Balance |
Balance |
Balance |
Balance |
| Molybdenum (Mo) |
2-3% |
2.5-3.5% |
3-4% |
3.5-4.5% |
4-5% |
| Copper (Cu) |
1.5-2.5% |
1.5-3% |
1.5-3% |
1.5-3% |
1.5-3% |
| Other Elements |
Trace |
Trace |
Trace |
Trace |
Trace |
Mechanical Properties
The mechanical properties of these alloys are equally important, ensuring they can withstand the demands of their applications. Here is a table summarizing these properties:
| Property |
UNS NO7022 |
UNS NO7725 |
UNS NO7740 |
UNS NO9945 |
UNS NO9925 |
| Tensile Strength (MPa) |
700-900 |
750-950 |
800-1000 |
850-1050 |
900-1100 |
| Yield Strength (MPa) |
300-400 |
350-450 |
400-500 |
450-550 |
500-600 |
| Elongation (%) |
30-40 |
30-40 |
30-40 |
30-40 |
30-40 |
| Hardness (HRB) |
80-90 |
85-95 |
90-100 |
95-105 |
100-110 |
Steel Grade
These alloys fall under the Incoloy 925 grade, known for its high strength and excellent corrosion resistance, particularly in sour gas environments.
Application
- Oil and Gas Industry: Used in downhole and surface gas well components.
- Chemical Processing: Ideal for equipment exposed to corrosive chemicals.
- Marine Engineering: Suitable for seawater applications due to its resistance to saltwater corrosion.
- Aerospace: Utilized in high-temperature engine components.
Possible Alternative Grades
While Incoloy 925 and its variants are highly effective, alternative grades may be considered depending on specific requirements:
- Inconel 625: Known for its high strength and resistance to oxidation and corrosion.
- Hastelloy C276: Offers excellent resistance to pitting and stress corrosion cracking.
- Monel 400: Suitable for applications requiring good mechanical properties at sub-zero temperatures.
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