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┃ Material
Alloy 601, UNS N06601, W.Nr. 2.4851
┃ Overview
Alloy 601 is a nickel-chromium-iron alloy with additions of aluminum and titanium.
Alloy 601 is specifically recommended for service above 550°C (1022°F) because of its higher creep-rupture properties resulting from its controlled carbon content and coarse grain size.
Alloy 601 is a general-purpose engineering material for applications that require resistance to heat and corrosion. An outstanding characteristic of Alloy 601 is its resistance to high temperature oxidation. The alloy also has good resistance to aqueous corrosion, has high mechanical strength, and is readily formed, machined and welded. The alloy's nickel base, in conjunction with substantial chromium content, provides resistance to many corrosive media and high- temperature environments. Oxidation resistance is further enhanced by the aluminum content.
┃ Application
The properties of Alloy 601 make it a material of broad utility in such fields as thermal processing, chemical processing, pollution control, aerospace, and power generation.
Alloy 601 is a standard material of construction for various types of thermal-processing equipment. Industrial-heating applications include baskets, trays, and fixtures for annealing, carburizing, carbonitriding, nitriding and other heat-treating operations. In industrial furnaces, the alloy is used for radiant tubes, muffles, retorts, flame shields, strand-annealing tubes, woven-wire conveyor belts, chain curtains, burner nozzles, and electrical resistance heating elements. Other thermal-processing applications are thermocouple protection tubes, furnace-atmosphere generators, and infrared radiant screens.
┃ Chemical composition (wt%)
|
Material |
Fe |
Ni |
Cu |
Cr |
Al |
C |
|
Alloy 601 |
Balance |
58.0-63.0 |
≤1.0 |
21.0-25.0 |
1.0-1.7 |
≤0.10 |
|
Material |
Mn |
Si |
P |
S |
Ti |
B |
|
Alloy 601 |
≤1.0 |
≤0.50 |
≤0.020 |
≤0.015 |
≤0.5 |
≤0.006 |
┃ Mechanical property
|
Material |
Tensile strength MPa |
Yield strength at 0.2 offset MPa |
Elongation in 2” % min. |
Reduction of area % min. |
|
Alloy 601 |
≥550 |
≥205 |
≥30 |
|
┃ Corrosion resistance
Alloy 601 is termed a heat resistant alloy on account of its excellent resistance above 550°C (1022°F) against hot gases and combustion products, as well as against molten salt, while at the same time exhibiting good mechanical short-time and long-term properties. Even under severe conditions, such as under cyclic heating and cooling, alloy 601 retains a tightly adherent oxide layer which is very resistant to spalling.
The maximum operating temperature of alloy 601 in air is 1200°C (2192°F), while the loss of weight from scaling is not higher than 1 g/m2 • h on average.
┃ Available Process
(1) Hot formed, solution annealed, descaled
(2) Cold worked and bright annealed
(3) Cold worked, bright annealed, polished (MP, EP etc.)
┃ Common Tests
Chemical composition
Tension
Hardness
Flaring
Flange
Flattening
Micro structure
Hydrostatic
NDT
Intergranular Corrosion
Surface condition
Shape and dimension
Positive Material Identification
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