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Major alloying elements are copper, chromium, molybdenum. Has a good overall performance, resistance to corrosion and stress corrosion of various acid. The first application (1905 U.S. production) is the nickel-copper (Ni-Cu) alloy, also known as Monel (Monel alloy Ni 70 Cu30); addition to nickel-chromium (Ni-Cr) alloys (nickel-base alloy is , corrosion resistant alloy corrosion resistant alloys), nickel-molybdenum (Ni-Mo) alloys (mainly refers Hastelloy B series, corrosion resistant alloy professional production enterprises Beijing Iron and Steel Research, Baoji Titanium Group of Materials companies, etc.), nickel-chromium-molybdenum (Ni-Cr-Mo) alloys (mainly refers Hastelloy C-Series, a professional production enterprises Beijing corrosion resistant alloy Steel Research Institute, Beijing Financial Commodities Ltd., Baoji Titanium Group scarce metal materials company, etc.). At the same time, pure nickel is corrosion resistant nickel-base alloys typical. These corrosion resistant nickel-base alloys are mainly used in the manufacture of oil, chemical, power and other corrosion-resistant parts atmospheres.

Multi-class nickel-based corrosion resistant alloy with austenite. State in the solution and aging treatment, the alloy of the austenitic matrix and grain boundaries and intermetallic phases and metal carbonitrides present, a variety of corrosion resistant alloy according to the composition and characteristics classified as follows:

Ni-Cu alloy in a reducing medium, corrosion resistance than nickel, and in an oxidizing medium and superior corrosion resistance of copper, which oxygen and oxidizing conditions, the high-temperature fluorine gas, hydrogen fluoride and hydrogen fluoride Acid best materials (see metal corrosion).

Ni-Cr alloy is nickel-base alloy; mainly in oxidizing media conditions. High temperature oxidation and sulfur, vanadium and other gas corrosion, the corrosion resistance of chromium content increases with the increase. Such alloys have good resistance to hydroxides (such as NaOH, KOH) to corrosion and stress corrosion.

Ni-Mo alloy mainly in reducing medium corrosive conditions. It is resistant to hydrochloric acid corrosion of an alloy of the best, but in the presence of oxygen and oxidants, corrosion resistance is significantly reduced.

Ni-Cr-Mo (W) alloy is a combination of the Ni-Cr alloy, Ni-Mo alloys. Mainly in the oxidation - reduction mixed media conditions. These alloys at high temperature hydrogen fluoride gas, oxygen and oxidant in hydrochloric acid and hydrofluoric acid solution at room temperature, good corrosion resistance in wet chlorine.

Ni-Cr-Mo-Cu alloy has both resistance to nitric acid and sulfuric acid corrosion resistance in some oxidation - reduction of mixed acid also has good corrosion resistance.