Seamless ASTM B444 Inconel 625 Nickel Alloy Steel Pipe is a high-performance piping product made from a nickel-chromium-molybdenum alloy (Inconel 625 or UNS N06625) manufactured to the ASTM B444 specification.This combination of material and specification is known for exceptional corrosion resistance, high strength, and performance across a wide range of temperatures.Inconel 625 pipe under this standard is often supplied in one of two grades:• Grade 1 (Annealed): Suitable for service up to about (). This is the default condition.• Grade 2 (Solution Annealed): Recommended for use above () to improve creep and fatigue properties.① STANDARD: ASTM B444, ASME SB 444② OD RANGE : 6-457 MM③ THICKNESS RANGE: 1-45 MM
Grade |
C |
Mn |
Si |
P |
S |
Cr |
Nb + Ta |
Co |
Mo |
Fe |
Al |
Ti |
Ni |
625 |
≤0.100 |
≤0.500 |
≤0.500 |
≤0.015 |
≤0.015 |
20.000 - 23.000 |
3.150 -4.150 |
≤1.000 |
8.000-10.000 |
≤5.000 |
≤0.400 |
≤0.400 |
Bal |
Material |
Form and Condition |
Tensile Strength MPa |
Yield Strength (0.2% Offset) |
Elongation 4D(%) |
Hardness HB |
||
|
ksi |
MPa |
ksi |
MPa |
|||
Alloy 625 Bar |
Annealed |
≥120 |
≥827 |
≥60 |
≥414 |
≥30 |
≤ 287 HB |
Alloy 625 Sheet |
Annealed |
≥120 |
≥827 |
≥60 |
≥414 |
≥30 |
145-240 |
Alloy 625 Tube3 |
Annealed |
≥120 |
≥827 |
≥60 |
≥414 |
≥30 |
- |
Alloy 625 Tube4 |
Solution annealed |
≥100 |
≥690 |
≥40 |
≥276 |
Note:
1. Hot forming quality pipe and tubing is furnished to chemical requirements and surface inspection only. No tensile properties are required.
2. The minimum strength values apply only to tubing in straight lengths.
3. Annealed at 1600 F (871 °C) minimum.
4. Solution annealed at 2000 °F (1093 °C) minimum, with or without subsequent stabilization anneal at 1800 °F (982 °C) minimum to increase resistance to sensitization.
Pipe Seamless |
ASTM B444, ASTM B829, ASME SB 444 |
Pipe Welded |
ASTM B705, ASTM B775, ASME SB 705 |
Tube Seamless |
ASTM B444, ASME SB 444, |
Tube Welded |
ASTM B704, ASME SB 704 |
Inconel Alloy 625 (UNS designation N06625) is a nickel-based superalloy that possesses high strength properties and resistance to elevated temperatures. It also demonstrates remarkable protection against corrosion and oxidation. Its ability to withstand high stress and a wide range of temperatures, both in and out of water, as well as being able to resist corrosion while being exposed to highly acidic environments makes it a fitting choice for nuclear and marine applications.
Inconel 625 maintains its strength and stability in temperatures ranging from cryogenic to 980°C (1800°F). Its high-temperature strength makes it suitable for applications in jet engines and nuclear reactors.The alloy is highly resistant to various types of corrosion, including oxidation, carburization, and pitting. This makes it ideal for use in harsh chemical environments, including marine applications.
Inconel 625 was developed in the 1960s with the purpose of creating a material that could be used for steam-line piping. Some modifications were made to its original composition that have enabled it to be even more creep-resistant and weldable. Because of this, the uses of Inconel 625 have expanded into a wide range of industries such as the chemical processing industry, and for marine and nuclear applications to make pumps and valves and other high-pressure equipment.
Because of the metal's high Niobium (Nb) levels as well as its exposure to harsh environments and high temperatures, there was concern about the weldability of Inconel 625. Studies were therefore conducted to test the metal's weldability, tensile strength and creep resistance, and Inconel 625 was found to be an ideal choice for welding. Other well-known names for Inconel 625 are Haynes 625, Nickelvac 625, Nicrofer 6020, Altemp 625 and Chronic 625.
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