Kudzora kwesimbi isina tsvina intergranular corrosion, 304 simbi isina tsvina, 304 simbi isina ngura uye ngura musimbi isina tsvina intergranular corrosion mune imwe 10%, ichaita kuti kunamatira kwezviyo kwadzikira, pamberi pekushushikana, kuve nyore kutsemuka, kunyangwe kukoromoka. , uye yakavanzwa, isingaoneki kubva pachimiro chayo. Inokonzerwawo nezvimwe zvikonzero zvikuru zvekuora. Intergranular corrosion of austenitic stainless steel inokonzerwa nehurombo inonyanya kukonzerwa nemiganhu yezviyo Cr, Cr uye c nyore fomu makemikari emakemikari, iyo Cr content.
1, iyo makemikari kuumbwa uye chimiro
(1) C zviri mukati
C zvemukati zvesimbi mhedzisiro ye intergranular corrosion ye austenitic simbi isina chinhu ndiyo inonyanya kukosha chinhu. Kune rumwe rutivi, nyatso kudzora c uye chengetedza kabhoni yemukati mu base simbi uye welding tsvimbo pa 0.08%, pane base simbi uye welding zvinhu wedzera stabilizer zvinhu zveTi, Nb, yakasimba affinity ne c, kabhoni pamberi peCr bind, ichigadzira yakagadzikana. compound.
(2) maitiro maviri echikamu
Dual chikamu chimiro chichawedzera zvakanyanya kugona kwekupokana kune intergranular corrosion. Kune rumwe rutivi, akabatanidza ferrite kugadzira zvinhu, senge chromium, Silicon, aruminiyamu, molybdenum, weld kuumbwa kwehuviri-chikamu chimiro, pane yakasarudzwa yekuvaka mumiriri ine ferrite zvimwe zvewelding.
2, welding tekinoroji
(1) tembiricha muna 450 ~ 850 ℃ tembiricha siyana, kunyanya pa 650 ° c inonyanya kugadzirwa intergranular ngura ngozi tembiricha zone (inozivikanwawo setembiricha nharaunda-sensitive). Stainless simbi welding, welds inogona kutorwa pasi pe laminate, kana zvakananga kumashure kwemvura kutonhora kwe weld, kuti itonhore nekukurumidza, kuderedza nguva muhutanho hwekushisa, matanho anoshanda ekuvandudza kusimba kwekudzivirira kwemajoini.
(2) kuwedzera kwemagetsi emagetsi emagetsi, inomhanyisa kuonda kweaustenitic simbi isina tsvina. Munguva yewelding process, ine yakaderera ikozvino, yakakwira welding kumhanya, pfupi-arc, akawanda pass welding nzira, uye kuderedza kupisa. Kupisa kwakadzikira, nenzira yekunyevenutsa tembiricha nekukurumidza kudzivirira kuparara kwemukati megranular kwekupisa kwakakanganiswa nzvimbo.
Nguva yekutumira: Mar-12-2018