SUS304stainlesssteelistypicalofausteniticstainlesssteel,whichorganizationismetastableaustenite,easilyappearsworkhardeningincoldrolling.Accordingtothecommonprocess,themaxreductionofcoldrollinginonestageisbelow80%,wetrytorasiethemaxreductionto90%inonestage(wecalledthat'greatreduction')fromtheviewofcutingcost.Duetotheworkhardening,greatreductionbringslotsofproblem(thedifficultyofflatnesscontrol,stripbreak..etc)。ThisarticleanalyzedthegreatreductionfromproperityofSUS304steel,milltypes,flatnesscontrol,rollingtechnicsetc,suppliedthecorrespondingsolutions,andformedasophisticatedgreatreductiontheory.Thisarticlefocusesontheunusualthermalcrownofrawmaterials(ie,abnormaldistributionofhorizontalthickness)andtherollingforcefluctuationsin'greatreduction'rolling.First,the'distortion'phenomenonwhichcausedbyunusualthermalcrownofrawmaterialsisexplained,wedge-shapedstripIncoiling,becauseofabigdifferenceinthicknessonbothsides,leadstodifferentcompressivestressonbothsidesofflatnessroll,sothattheflatnessmeasurementisdistorted;Second,the'stripshifting'phenomenoncausedbywedgeshapeofstripisexplained,weanalysisthestressonbothsidesofthestrip,concludedthatthewedge-shapedstriponthecoilerwillshifttothethicksideofthedeviation,theamountofstripshiftingisrelatedtothewedgelevel;BecauseofthecharacteristicsofSUS304,thestripisdifficulttoberolledinthelastfewpasses.sothestripbreakingiseasilyoccurred,wefoundthereasonableparameters(rollingspeed,coolingoil,tension,etc)tosolutethatproblem;Thedeviationofrollingforcewillcausetheshapeoftherollgap,thusaffectingtheshapecontrol,especiallyintheheadandtailpartofthestrip,Itisimportanttominimizethedeviationofrollingforce;The'greatreduction'processprovidethefavorableflatness(<8I-unit)andthicknessdeviationwhichlessthan±3um,withnosi
