Cov neeg feem ntau xav hais tias hlau nplaum nqus 304 stainless hlau screws, txheeb xyuas nws cov khoom siv thiab kev lees thiab kev tseeb, tsis ntxais tsis yog-sib nqus, xav tias nws yog qhov zoo, tiag tiag; cov neeg ua haujlwm tau sib nqus, nws yog cov cuav phom sij. Qhov tseeb tiag, qhov no yog ib qho kev sib tw, kev coj tus kheej thiab kev coj tsis ncaj. Muaj ntau ntau yam ntawm 304 xim hlau screws, uas muaj peev xwm muab faib ua ob peb hom raws li lub koom haum kev sib tham ntawm chav tsev kub:
1. Austenitic hom: xws li 304, 321, 316, 310, thiab lwm yam .;
2. Martensite lossis ferrite type: xws li 430, 420, 410, thiab lwm yam .;
Qhov hlau tsis muaj steel uas feem ntau yog siv los ua ib txoj phuam zoo nkauj plag feem ntau yog cov khoom 304 austenitic. Feem ntau hais lus, nws yog tsis muaj hlau nplaum lossis tsis muaj zog. Txawm li cas los xij, cov khoom sib nqus yuav tshwm sim vim yog muaj tshuaj lom neeg hloov los yog ua haujlwm ua rau ntawm qhov muag. Txawm li cas los xij, stainless hlau yuav tsis muab xam. Lub bolt yog cuav lossis tsis tsim nyog. Yog vim li cas?
Cov lus saum toj no tau hais tias tsis muaj hlau nplaum lossis tsis muaj zog, thiab martensite lossis ferrite yog sib nqus. Vim kev cais los yog kev kho cua sov tsis zoo thaum lub sij hawm smelting, nws yuav ua rau me me ntawm martensite lossis ferrite hauv austenitic 304 xim hlau. Lub koom haum ntawm lub cev. Ua li no, 304 xim hlau tsis muaj hlau nplaum.
Tsis tas li ntawd, 304 stainless hlau tom qab ua cov txheej txheem, lub koom haum kev lag luam tseem yuav hloov mus martensite, qhov ntau dua qhov txias deformation degree, qhov ntau martensite transformation, ntau dua qhov sib txawv hlau. Xws li tib cov khoom siv hlau, ntau lawm Φ76 raj, tsis muaj kev sib txawv ntawm kev sib nqus, ntau lawm Φ9.5 raj. Vim yog txoj kev sib tw loj loj ntawm cov hlau nplaum loj yog qhov pom tseeb, qhov qoob loo ntawm lub raj ntawm lub cev loj dua lub raj xa kab, tshwj xeeb tshaj yog cov ntu folding, cov deformation ntau dua kev sib nqaiv ntau dua.
Yuav kom tshem tawm cov khoom sib nqus ntawm 304 hlau los ntawm cov teeb meem saum toj no, qhov ruaj ntseg austenite qauv tuaj yeem rov qab los ntawm kev kho siab los kho qhov kub, yog li tshem tawm cov khoom sib nqus.
Hauv particular, cov khoom sib nqus ntawm 304 tsis muaj hlau tsis yog vim cov lus saum toj no tsis yog tib yam li cov khoom sib nqus ntawm cov hlau tsis xeb ntawm lwm cov ntaub ntawv xws li 430 thiab carbon steel. Ntawd yog, cov khoom sib nqus ntawm 304 steel yeej qhia tau qaug zog cov khoom sib nqus.
Qhov no tau qhia rau peb tias yog cov hlau tsis muaj zog tsis nqhis los yog sib nqus kiag li, nws yuav tsum raug txiav txim siab ua 304 lossis 316; Yog hais tias nws yog tib yam li carbon hlau, nws qhia tau hais tias muaj zog magnetism, vim hais tias nws tsis yog 304 cov khoom.