The oxidation/reduction/corrosion resistance of Hastelloy C-2000 (HY-industry technical centre)
Hastelloy C-2000 (UNS N06200) alloy is a nickel-based high-temperature alloy composed of nickel, molybdenum, chromium and other elements. It is an optimized alloy developed by Hastelloy Corporation of the United States to expand the application range of materials. It can withstand a wide range of oxidizing and non-oxidizing chemicals, and exhibits excellent resistance to pitting and crevice corrosion in chlorides and other halides.
Hastelloy C-2000 alloy has been listed in ASME and ASTM standards B-564, B-574, B575, B619, B-622, B-366. The DIN standard number is No.2.4675, and the UNS number is N06200. Compared with Hastelloy alloys such as C276, C2000 has a lower density, about 8.5g/cm3. This alloy entered the Chinese market at the end of 1995, and has been continuously affirmed by the market because of its inherent versatility. Technological innovation not only improves the alloy’s resistance to corrosion, but also expands the application range of Ni-Cr-Mo family alloys.
The advantages of Hastelloy C-2000 are: high nickel base alloy with copper added design
First of all, in the multi-purpose nickel-chromium-molybdenum material, the copper content of 1.3-1.9% is innovatively added, which greatly enhances the resistance to sulfuric acid. As we all know, adding copper to low-nickel alloys such as incoloy 825 or Alloy 31 increases the corrosion resistance of sulfuric acid, but it is the first time that copper has been added to more than 50% of high-nickel alloys.
This new material is designed to resist more corrosive chemicals, including sulfuric acid, hydrochloric acid and hydrofluoric acid. Unlike the previously optimized Ni-Cr-Mo alloy’s oxidation resistance or reducing acid, C-2000 Hastelloy has corrosion resistance to both environments. The combined effect of molybdenum and copper (at 16% and 1.6% respectively) gives the alloy excellent resistance to corrosion by reducing media, such as dilute hydrochloric acid or sulfuric acid.
At the same time, the high chromium content (23%wt) guarantees the resistance to corrosion of oxidizing media, such as the corrosion of iron ions, copper ions and dissolved oxygen, in order to prevent it to the greatest extent from the oxidation The influence of substances contaminated by dissolved oxygen.
The high chromium content combined with molybdenum and copper gives a sufficiently excellent resistance to corrosion in reducing environments without sacrificing metallurgical stability.
C-2000 engineering application practicality
From an engineering point of view, C-2000 Hastelloy offers great potential to increase production. When used in the place of the original Ni-Cr-Mo alloy, its enhanced corrosion resistance can obtain a longer equipment life under the same material thickness and a higher safety factor under more severe conditions.
The improvement of the corrosion resistance of Hastelloy C-2000 alloy in all aspects allows the equipment to be used for multiple purposes (reactors, heat exchangers, valves, pumps, etc.), thereby receiving a greater return on investment, such as one reactor Adapt to another working condition of hydrochloric acid mixed liquid and then transformed into nitric acid-based mixed liquid.
C-2000 alloy shows superior pitting and crevice corrosion resistance than C-276 alloy, which is an industry standard. Its forming welding and machining forming performance are similar to C-276.
C-2000 Welding Instructions
Like other nickel alloys, C-2000 alloy is ductile and easy to form and weld. However, the following requirements must also be followed:
1. Ni-Cr-Mo alloy has the characteristics of low penetration depth, it must have a suitable welding angle and the smallest welding surface.
2. The welding metal flows viscously, and increasing the current will not significantly increase the fluidity of the metal in the molten pool.
3. Oxyacetylene flame welding and submerged arc welding are not recommended. In gas shielded arc welding (tungsten electrode or metal electrode), 100% argon gas protection is used when performing root bead welding.
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