Chemical Engineering - Chemical Engineering Basics - Discussion

Agree, Nickel is the correct answer.

Nickel: Increases strength and hardness without sacrificing ductility and toughness. It also increases resistance to corrosion and scaling at elevated temperatures when introduced in suitable quantities in high-chromium (stainless) steels.

There are two things to discuss;

1)hardness 2) ductile.

Nickel alloy is the best option in comparison to others, nickel belongs to the transition metal and it is hard and ductile and its atomic number is 28.

Please explain the right answer.

Nickel is silvery-white, Hard, malleable, and ductile metal. And It is of the iron group and it takes on a high polish. It is a fairly good conductor of heat and electricity. In its familiar compounds nickel is bivalent, although it assumes other valences. It also forms a number of complex compounds. Most nickel compounds are blue or green. Nickel dissolves slowly in dilute acids but, like iron, becomes passive when treated with nitric acid. Finely divided nickel adsorbs hydrogen.

Chromium metal lacks ductility and is susceptible to nitrogen embrittlement, and is not used as a structural metal.

Here cr is used in steel to anti-corrosive element.

Ni is specific for ductility simple answer.

Nickel is hard and ductile. While Chromium is hard and brittle.

Nickel is silver-white, hard metal. Chromium metal lack ductility.

But nickle is known for its ductility. I think answer should be Cr as it provide hardness when alloyed.

Nickel is a hard metal. Chromium metal is used for cement industry.