Improvement of surface treatment process of 65SiCrV6 spring steel wire for automobile
Severe transverse cracking defects occurred during drawing of 65SiCrV6 spring steel wire for automobile.The cau-ses of transverse cracking defects were analyzed by metallographic microscope,SEM and EDS.It was found that there were residual oxide scale on surface of steel wire near transverse crack defects.The process flow and process parameters are improved.The original intermittent acid pickling and phosphating has been changed to online acid pickling and phosphating.Fully utilize residual temperature of normalizing and implement two acid pickling procedures.Use acidic oxalic acid surface adjustment agent and adjust process parameters of acid pickling and phosphating.The oxide layer on surface of steel wire is pick-led clean and phosphating film is uniform after improved,steel wire surface quality can meet requirements of drawing process.
65SiCrV6spring steel wireacid picklingphosphating film
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