Inconel 690 nickel alloy tube

INCONEL® alloy 690 (UNS N06690/W. Nr. 2.4642) is a high-chromium nickel alloy having excellent resistance to many corrosive aqueous media and high- temperature atmospheres. In addition to its corrosion resistance, alloy 690 has high strength, good metallurgical stability, and favorable fabrication characteristics.

The Inconel Alloy 690 Pipe & Tube provides supreme resistance to the wide range of corrosive media such as chloride ion stress cracking as well as offers high temperature performance and causes resistance to oxidation.

Inconel Alloy 690 Pipe & Tube is an austenite nickel-chromium-based superalloys grades tube, tubing, pipe & tubular products to Oil And Gas, Nuclear And Power, Power Generation, Aerospace, Process Industries & Refining, General Industrial, Chemical Process, Medical, High Purity and High Performance. Inconel Alloy 690 Pipe & Tube are well suited for service in extreme environments subjected to pressure and heat.


Alloy 690 is designated as UNS N06690, W. Nr. 2.4642 and ISO NW6690.

Rod, Bar, Wire and Forging Stock: ASTM B166; ASME SB 166, ASTM B 564; ASME SB 564, ASME Code Case N-525, ISO 9723, MIL-DTL-24801

Seamless Pipe and Tube:  ASTM B 163; ASME SB 163, ASTM B 167; ASME SB 167, ASTM B 829; ASME SB 829, ASME Code Cases 2083, N- 20, N-525, ISO 6207, MIL- DTL-24803

Plate, Sheet, and Strip:  ASTM B168; ASME SB 168; ASME N-525, ISO 6208, MIL-DTL-24802
Welding Products: – INCONEL Filler Metal 52 – AWS A5.14 / ERNiCrFe-7; INCONEL Welding Electrode 152 – AWS A5.11 / ENiCrFe-7

Inconel Grade 690 Chemical Composition

Grade C Mn Mo Co Si P S Ni Cr Fe Al Ti Nb + Ta
Inconel 690 0.10 max 0.50 max 8.0 – 10.0 max 0.50 max 0.015 max 0.015 max 58.0 min 20.0 – 23.0 5.0 max 0.40 max 0.40 max 3.15 – 4.15


Density 8.19 g/cm3
Melting Point 1343-1377 °C (2450-2510 °F)
Tensile Strength MPa – 66.80
Yield Strength (0.2%Offset) MPa – 110
Elongation 39 %

Inconel Grade 690 Equivalent Standards

Inconel 690 NCF 690 NA 21 2.4856 N06690 NC22DNB4M NiCr22Mo9Nb ЭИ602 ХН75МБТЮ

Heating and Pickling

Like other nickel alloys, alloy 690 should be clean before it is heated and should be heated in a low-sulfur atmosphere. Furnace atmospheres for open heating should also be slightly reducing to prevent excessive oxidation of the material.

INCONEL alloy 690 is a solid-solution alloy and is not hardenable by heat treatment. The alloy is normally used in the annealed condition.


The temperature range for heavy hot forming of INCONEL alloy 690 is 1900 to 2250°F (1040 to 1230°C). Light forming can be done at temperatures down to 1600°F (870°C).


INCONEL alloy 690 is an austenitic, solid-solution alloy with a high degree of metallurgical stability. The alloy has a low solubility for carbon, and its microstructure normally contains carbides. The major carbide present in the alloy is M23C6; the abundance of the phase varies with carbon content and thermal exposure of the material. Other phases normally present are titanium nitrides and carbonitrides. No embrittling intermetallic phases such as sigma phase have been identified in alloy 690.

Post time: Oct-22-2021