DETERMINATION OF THE TENDENCY OF STEEL 12KH18N10T PIPE SPECIMENS TO INTERCRYSTALLINE CORROSION

The tendency of steel 12Kh18N10T pipe specimens to intercrystalline co rrosion (ICC) by the accelerated electrochemical method in a solution of 10% H2SO4 + 0.025 g/liter of KCNS [1] and in accordance with the AM U method (GOST 6032-89) is investigated It is demonstrated that the gr inding off of the etched surface layer, which is formed during the sco uring of steel under plant conditions, is required to establish relati onships between these methods The tendency to ICC is observed primaril y on the internal surface of the pipe specimens. Using supplementary m ethods (metallographic monitoring and artificial carbonizing), it is d emonstrated that the tendency to ICC under plant conditions is caused by carbonization of the surface when graphite lubrication is not compl etely cleaned from the surface.