Overview

NIMONIC alloy 901 (UNS N09901/W.Nr. 2.4662) is an age-hardenable Ni-Fe-Cr superalloy with significant additions of molybdenum, titanium and aluminum. The alloying route for this highperformance material may include combinations of vacuum induction melting, vacuum arc remelting and electroslag remelting, according to the final application and the customer’s specification. Typically, the alloy is used for gas turbine engine discs, shafts, rings, casings and seals with a maximum service temperature of around 600°C (1100°F).

Limiting Chemical Composition, %

Nickel....................................................................................................................................................................................42.50 max.

Chromium.............................................................................................................................................................................12.50 max.

Molybdenum...........................................................................................................................................................................5.75 max.

Titanium..................................................................................................................................................................................2.90 max.

Cobalt......................................................................................................................................................................................1.00 max.

Copper.................................................................................................................................................................................... 0.50 max.

Manganese.............................................................................................................................................................................0.50 max.

Silicon......................................................................................................................................................................................0.40 max.

Aluminum................................................................................................................................................................................0.35 max.

Carbon .....................................................................................................................................................................................0.10 max.

Iron............................................................................................................................................................................................1.00 max.

 Sulfur........................................................................................................................................................................................0.03 max.

Iron..............................................................................................................................................................................................Balance.

Physical Constants

Below are some physical constants and thermal properties of

Mechanical properties

Corrosion Resistance

Nimonic 901 boasts exceptional corrosion resistance, making it an ideal option in extreme environments where corrosive gases cannot be avoided. It exhibits excellent resistance to oxidation and nitriding, ensuring the material remains highly durable even when exposed to harsh chemicals.

 Forming

Nimonic 901™ has good ductility and can be easily formed using all the conventional methods.

Welding

Nimonic 901™ can be welded using the traditional welding methods. Some of the commonly used methods are gas-tungsten arc welding, shielded metal-arc welding, gas metal-arc welding and submerged-arc welding. It is recommended that matching alloy filler metal should be used. Before the welding process begins, the surface to be welded should be cleaned and should be free from oil, paint or crayon stains.

Heat Treatment

    The heat treatment for NIMONIC alloy 901 forged bar is a three-stage process involving a solution treatment followed by two age-hardening stages. The recommended procedure is 3h/1090°C (1994°F)/WQ + 4h/775°C (1427°F)/AC + 24h/705-720°C (1301- 1328°F)/AC.

Available  Forms