There is a stronger focus on a resistance to oxidation for nickel alloy 625 than 718, and is resistant to the effects of seawater.

Very strong and resistant to pitting, crevice corrosion, and stress-corrosion cracking.

Also known as Inconel 725, it is strong and resistant to corrosion. It also hardens over time.

Alloy 825 is probably the most cost effective around sulphuric acid. It’s useful for pressure vessels, and can stand temperatures up to 525 degrees celsius, but not above as there is a risk of rupture.

This nickel-iron-chromium composition doesn’t carburate or oxidise at high temperatures.

Stainless steel with a high nickel content, used in temperatures up to 700 degrees celsius

Nickel-copper alloy with a high resistance to a number of highly corrosive environments.

Excellent corrosion resistance due to the combination of nickel-iron-chromium alloy with carbon, molybdenum and copper.

Nickel-iron-chromium alloy again with the additions of molybdenum and copper to improve its resistance to acids and prevent corrosion cracking.