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Alloy 347

Alloy 347 exhibits excellent resistance to intergranular corrosion.

Alloy 347 from NeoNickel offers superior resistance to intergranular corrosion. It’s also suitable for high temperature service, due to its good mechanical properties. Alloy 347 is now available from NeoNickel Hranice.


Product formSize range fromSize range to
Alloy 347 welding wire0.762mm2.3622mm GET A QUOTE
Alloy 347 sheet & plate0.508mm101.6mm GET A QUOTE
Alloy 347 round bar9.5mm177.8mm GET A QUOTE
Alloy 347 coil4.76mm- GET A QUOTE

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Welding Consumables

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Sheet & Plate

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Chemical Analysis



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Perfect for applications in the Thermal Processing industry

Alloy 347 can be used in a variety of applications, here are just a few examples:

  • Oil Refineries
  • Fluid catalytic cracking units
  • Hanger rods
  • Recuperator tube sheets
  • Fired heater tubes
  • Equipment in and around reactors

About Alloy 347

Alloy 347 is generally used where corrosive conditions are severe, such as aircraft exhaust stacks, manifolds and ring collectors. Type 347 is also used for heavy welded assemblies which cannot be annealed after welding or where the operating conditions cause exposure within the temperature range between 426.67° to 815.55°F.

For more information on Alloy 347 please feel free to contact our Hranice facility on +420 581 604 712 or salesceska@www.neonickel.com


7.916 g/cm³
Electrical resistivity:
8.89 x 10^ -7 Ωm


AMS 5512, AMS 5646
UNS Number:
UNS S30347
Download the Alloy 347 Data Sheet Download

FAQs & Resources

Corrosion is an electro-chemical process that occurs between the surface of the material and the environment it is in contact with. For steel, it is essentially a process of oxidation and generally results in rusting on the surface. Corrosion can have various effects on the aesthetic and integrity of the structure depending on the extent of the process. Common types of corrosion found in the metal industry are uniform corrosion, pitting corrosion, galvanic corrosion, crevice corrosion, intergranular corrosion, dealloying and environmentally induced cracking such as hydrogen-induced cracking (HIC), stress-corrosion cracking (SCC) and corrosion fatigue. More information about specific case study on corrosion can be found in our technical resources.

Corrosion resistance, in material science, means a material’s ability to retain its integrity including chemical, physical and mechanical properties when subjected to a corrosive environment.

Common types of corrosion found in the metal industry are:

Uniform corrosion: This is the most common form of corrosion and leads to general loss of material over the surface of the structure. As a result, the corroded structure could eventually lose its overall strength and failure tends to occur at the weakest cross-section.

Pitting corrosion: Unlike uniform corrosion, pitting corrosion is a localised attack occurring on random spots where the protective oxide layer breaks down. Each pit can be shallow, deep or undercut. This type of corrosion is especially common where halide ions are present in the media such as pipes used in seawater applications. The depth, size and growth rate of the pits are impossible to predict and thus failures due to pitting corrosion can occur unexpectedly or much faster than those caused by uniform corrosion.

Galvanic corrosion: This corrosion process is caused by contact between dissimilar metals. The corrosion rate depends on the position of the metals on the galvanic series and various other factors.

Crevice corrosion: When two pieces of similar or dissimilar metals are positioned next to each other by means such as fastening, pressing, screwing or stacking, there exists a small gap between them. This confined region or gap is subjected to a higher concentration of corrosive environment due to higher electro-chemical activity and hence, higher risks of uniform and pitting corrosion.

Intergranular corrosion: This type of corrosion occurs along the grain boundary of the material due to the loss of chemical stability in the alloy metallurgy.

Dealloying: This type of corrosion is caused by the attack of certain alloying elements in the metal causing them to dissolve. This leads to metallurgical instability and loss of integrity of the structure.

Environmentally induced cracking: This type of corrosion is caused by specific environment and leads to micro cracks which could grow into larger cracks causing catastrophic failure in the structure. Hydrogen-induced cracking (HIC), stress-corrosion cracking (SCC) and corrosion fatigue are common examples of environmentally induced cracking.

Request a Quote

Fill in our online form to get a fast quote. Got a technical question? Contact us on techsales@neonickel.com or for more general enquiries please email us at enquiries@neonickel.com