Four Methods to Prevent Intergranular Corrosion of Stainless Steel Round Bar

Four methods to prevent intergranular corrosion of stainless steel round bar:

1. If you want to reduce the carbon content to combined carbon content in the stainless steel round bar is lower than the saturated solubility in the austenite in the equilibrium state, which solved the problem of carbide of chromium (Cr23C6) precipitation on grain boundaries. Generally, the combined carbon content in the stainless steel round bar can be reduced to less than 0.03% to meet the various requirements of anti-intergranular corrosion performance.

2. The addition of these two elements Ti and Nb to the stainless steel round bar can form stable carbide (TiC or NbC) elements, avoid the precipitation of Cr23C6 on the grain boundary, and effectively prevent the intergranular corrosion of austenitic stainless steel.

3. The stainless steel round bar has a dual-phase structure of austenite + ferrite by adjusting the ratio of austenite-forming elements and ferrite-forming elements in the steel, of which ferrite accounts for 6% to 13%. This duplex structure is less prone to intergranular corrosion.