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Discussion Forums - The Hendrix Group
HomeHomeDiscussionsDiscussionsGeneral Corrosi...General Corrosi...Corrosion of AISI 420 type steel in normal pipe waterCorrosion of AISI 420 type steel in normal pipe water
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12/17/2007 9:00 AM
 
Hello, We have a problem with corrosion of parts made from steel ASI 420. This parts was used in the environment of normal water from the house pipe during the grinding of some glass products. On the surface of steel we found a thick layer of corrosion products. We analyzed this products in the SEM with EDS microanalysis. The typical composition of this products is in weight %: 25.50% O, 0.67% Al, 13.68% Si, 0.53% Cl, 2.18% Ca, 3.41% Cr, 0.63% Mn, 51.53% Fe. Thankn you. Henrik
 
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12/18/2007 9:00 AM
 
Dear Henrik, To mention AISI 420 ( martensitic SS ) does not have significant corrosion resistance compared to austenitic grades like SS 304, SS 316. AISI 420 has improved strangth, wear resistance when used in Q&T condition and has good impact strength w.r.t. suitable selection of tempering temp. Ur AISI 420 parts are under influence of normal hose water and glass ( Si) particle environment . The corrosion products contains significant amount of Si which is a embed from glass fractions. More than 50% is Fe which identifies base corrosion of 420 but at thew same time "Cl" level is very very low which justifies ur water chemistry is good . May I say that it is a case of general corrosion and 420 may not be a suitable choice here and u may consult ur designer for a change to SS 304 or SS 316 provided you donot have very high mechanical performance and hardness, wear resistance requirement. Pl. share further and other experts pl. commenst if I am having any incorrectness. regards
 
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