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Inconel 601

UNS N06601, Alloy 601, W.Nr. 2.4851, Inconel® 601
Note that the designation “ Inconel®” is registered trademarks of the Special Metals Corporation group of companies. 


UNS N06601 is a nickel-chromium-based solid solution strengthened alloy. The alloy's nickel base, in conjunction with substantial chromium content, provides resistance to many corrosive media and high temperature environments, it is a general-purpose engineering material suitable for applications that require resistance to heat and corrosion. The alloy also has good resistance to aqueous corrosion, has high mechanical strength, and is readily formed, machined and welded.

  • Heat-treating Industry: baskets, trays, and fixtures for annealing, carburizing, carbonitriding, nitriding and other heat-treating operations
  • Chemical Field: Process heaters, condenser tubes in sour-water strippers, insulating cans in ammonia reformers, combustor components and catalyst grid supports in equipment for nitric acid production
  • Petrochemical Field: Catalyst regenerators and air preheaters in the manufacture of high-density polyethylene
  • Pollution-control Field: Thermal reactors in exhaust systems of gasoline engines, combustion chambers in solidwaste incinerators
  • Power-generation Field: Superheater tube supports, grid barriers, and ashhandling systems
  • Aerospace Field: jet-engine igniters, combustion-can liners, diffuser assembles, and containment rings in gas turbines for aircraft
Chemical Composition (%)
Material Ni Cr Fe Al C Mn S Si
N06601 58.0-63.0 21.0-25.0 Remainder 1.0-1.7 0.10 max 1.0 max 0.015 max 0.5 max
Mechanical Property
Material Tensile strength Yield strength 0,2 Elongation Hardness HB30
N06601 515-760 N/mm² 160-380 N/mm² 40-75% 55-95HB
Corrosion Resistance

Inconel 601 contains at least 58% nickel, 21% chromium, and 1% aluminum, the combination of the three gives the alloy superior resistance to high temperature corrosion mechanisms. Of particular significance is its resistance to oxidation at temperatures up to 2200°F (1200°C). By virtue of its contents of chromium and aluminum, Alloy 601 offers unique resistance to oxide spalling under cyclic thermal conditions.

Heat Treatment

Inconel 601 is not strengthened by heat treatment, if a broad ranges of strength and hardness is required, this can be achieved by a combination of cold work and annealing treatments. The amount of cold work and the section size of the material must be considered in establishing an annealing procedure.

Heating and Pickling

Like other nickel-base alloys, the grease, oil, paint, shop soil and other foreign substances must be removed from Inconel 601 before a heating operation is performed, and the alloy must be heated in a low-sulfur atmosphere. To prevent excessive oxidation of the material, the furnace atmosphere should also be slightly reducing. In addition, due to the contents of aluminum and chromium, Alloy 601 is readily forms a refractory surface oxide during heating, cannot be bright-annealed in the usual industrial furnace. Pickling is normally required to produce bright surfaces on parts that have been heated.


The cooling rate after heating has minimal impact on the mechanical properties of Inconel 601. However, if the material is to be pickled or exposed to other aggressive environments, it should be cooled rapidly through the 1000- 1400°F (540-760°C) temperature range to avoid sensitization. Note that specialized pickling procedures are required for Alloy 601 because of its inherent resistance to chemical attack.

Hot and Cold Forming

The recommended temperature range of hot-forming is 1600° to 2250°F (870° to 1230°C). Hot-working operations involving large deformations should be performed at 1900-2250°F (1040-1230°C). It is important to note that Inconel 601 has low ductility at temperatures between 1200° and 1600°F (650° and 870°C) and should not be worked in that range. High tensile properties can be developed in the material by careful working at temperatures below 1200°F (650°C).


Inconel 600 is slightly more machinable than Type 304 stainless steel and slightly less machinable than Type 303 free-machining stainless steel.  The alloy is best handled on heavy-duty equipment using cutting tools large and heavy enough to withstand the loads and to quickly dissipate the heat generated. Tools must be sharp and have the proper geometry.


Inconel 600 can be easily welded using conventional welding methods. The recommended welding materials for joining alloy 600 are Inconel welding electrode 182 for shielded metal-arc welding, Inconel filler metal 82 for gas tungsten-arc and gas metal-arc welding, and a combination of Inconel filler metal 82 and Incoflux 4 submerged arc flux for the submerged-arc process.

Product Forms
  • Bar & Rod
  • Plate & Sheet
  • Coil & Strip
  • Pipe & Tube
  • Fitting: Flange, Tee, Elbow, Reducer etc.
  • Forging: Ring, Shaft, Circle, Block etc.

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