Stainless steel paub, tsis nug kuv 201, 301, 304, 410, 430 uas yog zoo hlau
Stainless hlau (Stainless hlau) yog lub npe ntawm cov hlau stainless acid-resistant. Nws tiv taus cua, ua pa, dej thiab lwm yam kev qaug zog los yog tsis xeb hlau. Nws yog hu ua stainless hlau. Chemically resistant nruab nrab (kua qaub, alkali, ntsev, thiab lwm yam) Lub pob zeb kub etched yog hu ua acid-resistant steel.
Stainless hlau hais txog hlau uas tiv taus tsis muaj zog corrosive media xws li cua, ua pa, dej, thiab tshuaj lom etched media xws li kua qaub, alkali, ntsev, thiab lwm yam., Kuj yog hu ua stainless acid-resistant hlau. Nyob rau hauv daim ntaub ntawv siv, steel uas yog resistant rau tsis muaj zog corrosive media yog feem ntau hu ua steel hlau, thaum cov hlau uas yog resistant rau tshuaj media yog xa mus rau acid-resistant hlau. Vim qhov sib txawv ntawm cov tshuaj lom neeg muaj pes tsawg leeg ntawm ob, cov qub tsis tas yuav tiv taus tshuaj chemical corrosion, thaum kawg tom qab muaj xeb. Cov hlau khib nyiab ntawm cov hlau tsis muaj hnyav nyob ntawm qhov kev sib txuas ntawm cov hlau hauv cov hlau.
Feem ntau muab faib rau cov koom haum hauv cov koom haum:
Feem ntau, raws li cov qauv hauv metallographic, cov qauv uas tsis huv stainless steel raug cais rau peb hom: austenitic stainless hlau, ferritic stainless hlau, thiab martensitic stainless hlau. Rau ntawm peb lub hauv paus metallographic cov koom haum, rau cov kev xav tau thiab cov hom phiaj, dual phom hlau, nag lossis daus hardening steel thiab high hlau alloy hlau nrog hlau cov ntsiab lus tsawg dua 50% tau muab los.
1. Austenitic stainless hlau.
Lub hauv paus ntawm lub hauv paus yog tsim los ntawm cov qauv ntoo (CY theem) ntawm lub ntsej muag-ntse cubic siv lead ua, tsis yog-sib nqus, thiab tsuas yog muaj zog los ntawm kev ua haujlwm txias (thiab tej zaum yuav ua rau qee cov khoom sib nqus) ntawm stainless hlau. Lub Koom Haum Niam Txiv thiab Cov Hlau siv cov zauv nyob hauv 200 thiab 300 series, xws li 304.
2. Ferritic stainless hlau.
Lub matrix yog lub cubic lub cubic crystal qauv ntawm ferrite (ib theem), uas yog sib nqus thiab feem ntau tsis tau hardened los ntawm kev kho cua sov, tab sis txias ua haujlwm yuav ua rau nws me ntsis ntxiv stainless hlau. Lub Koom Haum Dub thiab Cov Hlau Association tau pom tias yog 430 thiab 446.
3. Cov kab hlau stainless Martensitic.
Lub matrix yog ib cov qauv ntawm martensite (lub cev-cub los ua cubic los yog cubic), uas yog sib nqus thiab muaj peev xwm raug kho los ntawm kev kho cua kub kom kho nws cov khoom siv dag zog. Lub koom haum American Iron and Steel yog tus lej 410, 420 thiab 440. Martensite muaj ib qho qauv austenitic thaum muaj kev kub ntxhov siab, thiab thaum txias mus rau qhov chaw sov li ntawm tus nqi tsim nyog, cov qauv tsim austenite tau hloov mus rau martensite (piv txwv li, nyuaj).
4. Austenitic-ferritic (duplex) stainless hlau.
Lub matrix muaj ob qho tib si austenitic thiab ferritic ob theem, nyob rau cov ntsiab lus ntawm tsawg theem matrix feem ntau ntau dua 15%, sib nqus, yuav muaj zog los ntawm kev ua hauj lwm txias tsis huv, 329 yog ib hom raug duplex stainless hlau. Muab piv nrog cov hlau tsis muaj hlau steel, duplex steel muaj siab zog, ua hauj lwm rau intergranular corrosion, chloride stress corrosion thiab pitting corrosion.
5. Kev yaim ua kom tawv nqaij hom tawv hlau.
Lub hauv paus yog ib qho austenitic los yog martensitic qauv thiab muaj peev xwm yuav tawv los ntawm cov nag lossis daus. Lub Koom Haum Meskas thiab Cov Hlau siv hlau siv 600 tawm ntawm cov lej, xws li 630, uas yog 17-4PH.
Nyob rau hauv dav dav, austenitic stainless steels yog superior corrosion kuj nyob ntxiv rau alloys. Ferritic stainless steels yuav siv tau rau hauv cov cheeb tsam tsis txhim kho corrosive. Nyob rau hauv qhov chaw me me corrosive, cov ntaub ntawv yuav tsum muaj siab. Rau lub zog los yog kev kub siab, martensitic stainless hlau thiab nag lossis daus hardened steel yuav siv tau.