Ukulawulwa kwentsimbi ye-intergranular corrosion, i-304 yensimbi engenasici, i-304 yensimbi engenasici kunye ne-corrosion kwi-corrosion ye-stainless steel intergranular corrosion kwi-10%, iya kwenza ukuba ukunamathela kweenkozo kunqabile, phambi koxinzelelo, kulula kakhulu ukuqhekeka, kunye nokushwabana. , yaye ifihliwe, ingabonakali kwindlela emile ngayo.Ikwabangelwa zezinye izizathu eziphambili zokubola.I-Intergranular corrosion ye-austenitic stainless steel ebangelwa yintlupheko ibangelwa kakhulu kwimida yengqolowa Cr, Cr kunye ne-c ifom elula i-chemical compounds, umxholo we-Cr.
1, ukwakheka kweekhemikhali kunye nesakhiwo
(1) C umxholo
Umxholo we-C wempembelelo yensimbi ye-intergranular corrosion ye-austenitic stainless steel iyona nto ibaluleke kakhulu.Ngakolunye uhlangothi, lawula ngokungqongqo c kwaye ugcine umxholo wekhabhoni kwisiseko sesinyithi kunye nentonga ye-welding kwi-0.08%, kwisiseko sesinyithi kunye nezinto ze-welding zongeza izinto ezizinzileyo ze-Ti, i-Nb, ubudlelwane obuqinileyo kunye no-c, i-carbon ngaphambi kokubopha i-Cr, ukuvelisa i-stable. ikhompawundi.
(2) isakhiwo sezigaba ezimbini
Ubume besigaba sesibini siya kwandisa kakhulu amandla okumelana ne-intergranular corrosion.Kwelinye icala, wajoyina ferrite ukwenza izinto, ezifana chromium, Silicon, aluminiyam, molybdenum, ulwakhiwo weld yolwakhiwo lwesigaba-ezimbini, kwi-arhente yokwakha ekhethiweyo equlethe ferrite izinto zokuwelda ngaphezulu.
I-2, iteknoloji ye-welding
(1) iqondo lobushushu kwi 450 ~ 850℃ uluhlu lobushushu, ingakumbi kwi 650 ° c yeyona lula uveliswa intergranular umhlwa ingozi zone lobushushu (ekwaziwa ngokuba ubushushu kummandla-uvakalelo).I-welding yensimbi engenasici, i-welds ingathathwa phantsi kwe-laminate, okanye ngokuthe ngqo kumqolo wokupholisa kwamanzi weld, ukupholisa ngokukhawuleza, ukunciphisa ixesha kwiqondo lokushisa, yimilinganiselo esebenzayo yokuphucula ukuxhathisa ukubola kwamalungu.
(2) ukwanda kwamandla omgca we-welding, kuya kukhawulezisa ukubola kwe-austenitic stainless steel.Ngethuba lenkqubo ye-welding, kunye ne-low current, isantya esiphezulu se-welding, i-short-arc, i-multiple pass welding method, kunye nokunciphisa ubushushu.Igalelo lobushushu obuphantsi, ngendlela yokwazisa ubushushu ngokukhawuleza ngokwaneleyo ukuthintela ukubola kwe-intergranular yendawo echaphazelekayo yobushushu.
Ixesha lokuposa: Mar-12-2018