The Inconel 690 nickel alloy has outstanding resistance to many corrosive aqueous media and high temperature environments. High chromium content gives alloy 690 superior corrosion resistance to oxidizing acids (nitric acid in particular) and salts and to sulfidation at high temperatures. The high chromium alloy also has excellent resistance to intergranular corrosion and intergranular stress corrosion cracking. 1.Excellent inoxidability in the high temperature. 2.Good resistance to carbonizing. 3.Good inoxidabilitiy in sulfur atmosphere 4.Good mechanical property in both room temperature and high temperature. 5.Good resistance to stress corrosion cracking, 690 have high creep rupture strength since it limits the carbon content and grain size, so recommend to use for above 500℃ environment.