Nickel alloys

Nickel alloys are super-alloys used in extreme environments to prevent corrosion, oxidation or carburetion caused by extreme temperatures and high pressures, can lead to pitting or cracking that collapse the equipment in operation. Its scope of use is mainly in the chemical, petrochemical, nuclear, naval, marine and aerospace industry. Alloys based on high percentages of nickel achieve high corrosion resistance and excellent performance both at high and low temperatures, which has made them indispensable for the production of industrial components subject to demanding service behaviors. A low level of impurities is desirable in all cases to minimise sensitivity to hot cracking and microfissuring therefore, all of our “nickel-based” family welding consumables are manufactured under strict quality controls that ensure their high purity.

The most important group within the nickel base family are Inconel® type materials (Ni, Cr, Fe) such as Inconel 600 / Inconel 601 / Inconel 625 / Inconel 718 which can have significant additions of manganese, niobium, molybdenum or cobalt giving resistance to hot cracking, increasing resistance to heat, and improving its resistance to creep.

Sheet metal and pipes with Hastelloy® (Ni, Mo, Fe, Cr) alloys such as Hastelloy C-276 / Hastelloy C-22 / Hastelloy X / Hastelloy W are also widely used, offering high resistance to corrosion in the presence of acids and salts in oxidizing and especially reducing conditions such as hydrochloric or hydrofluoric acids, hypochlorites, chlorides, sulfuric, phosphoric and many types of organic acids. It is exceptional in its resistance to cracking and pitting by seawater and to stress corrosion cracking induced by chlorides.

Another important group of base materials are Incoloy® alloys (Ni, Fe, Cr) such as Incoloy 800 / Incoloy 800H / Incoloy 800 HT / Incoloy 20 (Carpenter 20), highly appreciated for their good mechanical resistance and excellent behavior against oxidation and carburation at elevated temperatures.

Finally, we can count on another very important and used group, given its more than satisfactory behavior in the presence of sea water and steam at high temperatures, which are the Monel® type alloys (NiCu) such as the Monel 400 / Monel K500 / Monel R405 , which are also base materials resistant to stress corrosion cracking and the presence of different acids such as hydrochloric or sulfuric at moderate temperatures and concentrations.

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