904l stainless hlau phaj yog superaustenitic stainless hlau uas yog tsim rau nruab nrab mus rau siab corrosion kuj nyob rau hauv ib tug ntau yam ntawm ib puag ncig.Kev sib xyaw ntawm chromium thiab npib tsib xee cov ntsiab lus, nrog rau kev ntxiv molybdenum thiab tooj liab muab kev tiv thaiv corrosion zoo heev.Vim nickel 25% thiab molybdenum 4.5%, ASTM B625 UNS N08904 muab cov tshuaj zoo chloride kev nyuaj siab corrosion cracking kuj, pitting thiab dav corrosion kuj uas yog superior. rau 316L thiab 317L.Nws yog tsim los tawm-tawg ib puag ncig uas muaj dilute sulfuric acids.904l stainless hlau phaj muaj kev tiv thaiv zoo rau cov inorganic acids xws li kub phosphoric acid.Nws tuaj yeem yooj yim welded thiab ua tiav los ntawm txheej txheem fabrication.ss 904l phaj yog ductile heev thiab tuaj yeem tsim tau yooj yim.Qhov sib ntxiv ntawm molybdenum thiab nitrogen muab cov cuab yeej ua haujlwm muaj zog dua thiab nws yuav tsim nyog thaum piv rau qib 304/304L tus qauv.astm a240 hom 904l muaj kev tiv thaiv zoo rau cov dej hiav txwv sov thiab cov tshuaj chloride nres.Lub siab tsis kam ntawm nws yog tiv thaiv kev ntxhov siab corrosion cracking thiab nws yog vim muaj cov nyiaj npib tsib xee hauv nws cov muaj pes tsawg leeg.Ntxiv mus, qhov sib ntxiv ntawm tooj liab txhim kho kev tiv thaiv rau sulfuric acid thiab lwm yam kev txo cov neeg ua haujlwm hauv ob qho tib si nruj thiab mob me me.1.4539 phaj cov khoom, muaj kev tiv thaiv oxidation zoo.Txawm li cas los xij, cov qauv kev ruaj ntseg ntawm qib no poob rau ntawm qhov kub thiab txias, tshwj xeeb tshaj yog siab dua 400 ° C.ASTM A240 UNS N08904 cov khoom siv tau tuaj yeem daws cov cua sov-kho ntawm 1090 txog 1175 ° C los ntawm kev ua raws li txoj kev ua kom txias sai.Kev kho cua sov yog tsim rau hardening nws.1.4539 daim ntawv thov loj yog cov khoom siv roj refinery, Pulp thiab ntawv ua lag luam, roj txhuam cov nroj tsuag, thiab lwm yam.
