ASTM B983 UNS N07718 Nickel Alloy Steel Seamless Round Tube For Boiler
ASTM B983 UNS N07718 Nickel Alloy Steel Tube
Overview
ASTM B983 is a standard specification established by the American Society for Testing and Materials (ASTM). It specifies the requirements for precipitation hardening nickel-based alloys in the form of seamless and welded pipe and tube.In particular, N07718 refers to a specific alloy grade called Inconel 718. Inconel 718 is a high-strength, corrosion-resistant nickel-based superalloy commonly used in various applications such as aerospace, gas turbines, and nuclear reactors.So, referring to the standard ASTM B983 N07718 would imply the specifications and requirements for seamless and welded pipes and tubes made of Inconel 718 alloy.
Chemical Composition of ASTM B983 UNS N07718
| Grade | Ni | Cr | P | C | Mo | Si | Mn | Ti | Cu | S | |
| N07718 | Min | 50.0 | 17.0 | 2.8 | 0.65 | ||||||
| Max | 55.0 | 21.0 | 0.015 | 0.08 | 3.3 | 0.35 | 0.35 | 1.15 | 0.03 | 0.015 |
Mechanical Properies of ASTM B983 UNS N07718
| Grade | Condition | Tensile Str Ksi(Mpa) | Yield Str Ksi(Mpa) | Elongation(%) | Hardness |
| N07718 | Soluton Ann +prec hard | ≥150(1034) | ≥125(862) | ≥20 | ≤40 |
Outside Diamerer Tolerance of ASTM A789
| Norminal OD,in,(mm) | OD,in,(mm) | |
| Plus | Minus | |
| 3/4(19) to 1 1/2(38),incl | 0.015(0.4) | 0.031(0.8) |
| Over 1 1/2(38.1) to 4(102),incl | 0.031(0.8) | 0.031(0.8) |
| Over 4(102) to 9 1/4(235),incl | 0.062(1.6) | 0.031(0.8) |
| Over 9 1/4(235) to 12(305),incl | 0.110(2.8) | 0.110(2.8) |
Uses&Application
1>.Aerospace Industry: Inconel 718 is widely used in aircraft components, such as turbine discs, compressor blades, and engine casings, due to its high strength and resistance to extreme temperatures.
2>.Gas Turbines: Inconel 718 is utilized in gas turbine components, including combustion chambers, turbine blades, and casings, where it can withstand high-temperature environments and corrosive gases.
3>.Oil and Gas Industry: The alloy is employed in downhole and wellhead applications, such as tubing hangers, casing hangers, and connectors, where its resistance to corrosive fluids and high-pressure environments is crucial.
4>.Power Generation: Inconel 718 is used in power generation systems, including steam turbines, nuclear reactors, and gas turbines, where it can withstand high temperatures, pressure, and corrosive conditions.
5>.Chemical Processing: The alloy finds use in chemical processing applications, such as reactors, valves, and heat exchangers, where its resistance to various corrosive chemicals is essential.
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