Cov txheej txheem GB / T1220 qhia tias kev siv "-" rau lub S30408 steel (feem ntau hu ua 304) Cov ntsiab lus Cu qhia tias kev lag luam cov kev tswj tau ua rau muaj kev tawm tsam ntau heev. Nws tseem muaj ob lub suab hauv kev lag luam: Ib txhia xav tias "-" txhais tias "tsis muaj cai"; lwm qhov xav tias "-" txhais tau tias "tsis txhob nug." Vim hais tias tus txheej txheem tsis piav qhia "-", nws ua rau tib neeg to taub txog cov qauv thiab qhov tsis sib haum xeeb. Ntawm no peb tsom xam ntawm cov hauv qab no.
I. Kev Ntsuam Xyuas Ntawm Cov Txheej Txheem Steelmaking ntawm Austenitic Stainless Steel
Tam sim no, yog qhov chaw ntawm steel-making raw khoom yog xa rov qab hlau (feem ntau hu ua khoom seem) thiab hlau ore. Nyob rau hauv cov ntaub ntawv raw, muaj cov residual hlau hais, xws li cov ntsiab lus ntawm cov teeb meem Cu thiab Mo nyob rau hauv tus qauv, uas tsis tau tiav thaum lub sijhawm steelmaking. Los ntawm tus txheej txheem ntawm tshem tawm, tsuas yog thaum xaiv ntawm raw cov ntaub ntawv mus rau qhov txawv, raws li qhov muaj pes tsawg tus seem hlau tom qab faib cov khoom. Yog li no, tam sim no pom hais tias "-" nruab nrab yog cov "tsis muaj cai muaj" cov lus tsis siv rau hauv txoj kev lag luam steelmaking.
Thib ob, qhov tseeb txhais ntawm "-" yog sib npaug rau "tsis tas", raws li tau teev nyob rau hauv Table 1 ntawm tus GB / T1220 txuj ci rau lub austenitic stainless hlau tivthaiv cov qauv, qee cov khoom muaj cov qauv rau Cu thiab Mo Cheebtsam, tus qauv txheej txheem Cov kev sib sau, yog li nyob rau hauv tus txheej txheem rau kev siv ntawm "-" uas tsis tau Cu thiab Mo steel.
Qeb peb, los ntawm tus nqi ntsuas ntawm Cu, Cu ntsiab lus zoo los yog teeb meem thaum kawg?
1. Lub luag haujlwm ntawm Cu lub ntsiab lus: Hauv cov hlau uas tsis muaj hlau tsis muaj hlau, lub luag hauj lwm ntawm tooj yog ib qho kev ua txhua yam yog txo cov hauj lwm txias zog ntawm chromium-nickel austenitic stainless steels thiab txhim kho txoj kev ua txias txias. Cov tooj liab kuj tuaj yeem ua rau qhov corrosion kuj ntawm austenitic stainless steels kom txo cov xov xwm.
2. Feem cuam tshuam rau lub koom haum: Cov nyhuv ntawm cov tooj ntawm lub koom haum nyob ntawm seb tus nqi nickel hauv cov hlau. Cov ntsiab lus ntawm tooj liab hauv cov hlau uas tsis muaj kab hlau yeem txawv li ntawm 4% los yog tsawg dua, thiab tooj liab twb tsis muaj teebmeem rau ntawm cov hlau microstructure cov hlau hauv no ntau cov ntsiab lus.
3. Nyhuv ntawm kev ua tau zoo: Qhov sib ntxiv ntawm cov tooj ua rau lub zog ntawm lub chromium-nickel austenitic stainless hlau qis, thiab cov yas yog nce, thiab cov tooj liab ua rau lub cev tsis muaj zog ntawm cov chromium nickel austenitic stainless hlau. Yog li, tooj liab-muaj austenitic stainless steels feem ntau siv nyob rau hauv qee cov ntawv thov kom txias ua haujlwm.
Plaub, xaus
Qhov "-" hauv GB / T 1220-2007 stainless hlau qws txheem txhais tau tias "tsis tau"