Method for preventing the occurrence of intergranular corrosion of stainless steel tube

Intergranular corrosion of stainless steel tube corrosion is one of the most common form, a tremendous impact on the performance of stainless steel, in industrial production we have what method to prevent or stop (or slow) intergranular corrosion? Generally there are several ways:

First, to reduce the carbon content in stainless steel, intergranular corrosion is poor in CR corrosion, reduce the carbon content in stainless steel to prevent C and CR precipitation and thus prevent intergranular corrosion. More common are intercrystalline corrosion of 304L stainless steel is stronger than 304; the same 316L stainless steel tube with intergranular corrosion resistance is better than 316 stainless steel tube.

Second, the addition of metal Ti in stainless steel, titanium elements added can prevent the occurrence of intergranular corrosion co.. For example, 321 of the intergranular corrosion of 316Ti stainless steel is stronger than 304 same intergranular corrosion resistance pipe is better than 316L stainless steel pipe.

Third, with changing the crystal structure of the formation of ferrite and austenite dual phase crystal structure in order to prevent the occurrence of intergranular corrosion. For example, the double phase stainless steel intergranular corrosion resistance can be stronger than austenitic stainless steel. 2205 stainless steel or 2507 stainless steel tube of intergranular corrosion ability is stronger than the 316L stainless steel pipe.

Finally can improve stainless steel by using proper heat treatment way Kang to intergranular corrosion