Stainless Steel Intergranular Corrosion Control

Kuwongolera zitsulo zosapanga dzimbiri intergranular, 304 chitsulo chosapanga dzimbiri, 304 chitsulo chosapanga dzimbiri ndi dzimbiri mu chitsulo chosapanga dzimbiri intergranular dzimbiri ena 10%, zidzachititsa adhesion wa mbewu watsika, pamaso pa kupsinjika maganizo, zosavuta kwambiri kusweka, ngakhale crumple. , ndi zobisika, zosaoneka ndi maonekedwe ake.Zimayambitsidwanso ndi zifukwa zina zazikulu za dzimbiri.Intergranular corrosion ya austenitic zosapanga dzimbiri zitsulo chifukwa cha umphawi makamaka chifukwa cha malire a tirigu Cr, Cr ndi c zosavuta kupanga mankhwala mankhwala, Cr okhutira.

1, mankhwala zikuchokera ndi kapangidwe

(1) C zomwe zili

C zomwe zili muzitsulo zachitsulo za intergranular corrosion za austenitic zosapanga dzimbiri ndiye chinthu chachikulu kwambiri.Kumbali imodzi, kuwongolera mwamphamvu c ndikusunga zomwe zili mu chitsulo choyambira ndi ndodo yowotcherera pa 0.08%, pazitsulo zoyambira ndi zowotcherera zimawonjezera zinthu zokhazikika za Ti, Nb, kuyanjana kolimba ndi c, kaboni isanachitike Cr kumanga, kupanga khola. palimodzi.

(2) dongosolo la magawo awiri

Wapawiri gawo dongosolo adzawonjezera mphamvu kukana intergranular dzimbiri.Pa dzanja limodzi, anagwirizana ferrite kupanga zinthu, monga chromium, Silikoni, zotayidwa, molybdenum, kuwotcherera mapangidwe wapawiri gawo dongosolo, pa osankhidwa kumanga wothandizila munali ferrite kwambiri zipangizo kuwotcherera.

2, luso kuwotcherera

(1) kutentha mu 450 ~ 850 ℃ osiyanasiyana kutentha, makamaka pa 650 ° C mosavuta kwaiye intergranular dzimbiri ngozi kutentha zone (amatchedwanso kutentha dera-tcheru).Kuwotcherera zitsulo zosapanga dzimbiri, ma welds amatha kutengedwa pansi pa laminate, kapena mwachindunji kumbuyo kwa kuziziritsa kwamadzi a weld, kuziziritsa mwachangu, kuchepetsa nthawi ya kutentha, ndi njira zothandiza zowongolera kukana kwa dzimbiri kwa mafupa.

(2) kuwonjezeka kwa mphamvu yowotcherera, kumathandizira kuti dzimbiri la chitsulo chosapanga dzimbiri cha austenitic chiziyenda bwino.Pa kuwotcherera ndondomeko, ndi otsika panopa, mkulu kuwotcherera liwiro, yochepa-arc, angapo podutsa kuwotcherera njira, ndi kuchepetsa kutentha.Low kutentha athandizira, mwa njira tcheru kutentha mofulumira kupewa intergranular dzimbiri kutentha bwanji zone.