Stainless hlau
Stainless thiab acid-resistant steel yog hu ua stainless hlau. Nws yog tsim los ntawm ob ntu: stainless hlau thiab acid-resistant steel. Hauv luv luv, cov hlau uas tuaj yeem tiv taus atmospheric corrosion yog hu ua stainless hlau, thiab cov hlau uas tuaj yeem tiv taus cov tshuaj nruab nrab corrosion yog hu ua acid-resistant steel. Stainless hlau yog cov hlau alloy uas muaj ntau tshaj 60 feem pua ntawm cov hlau raws li cov matrix thiab alloying ntsiab xws li chromium, npib tsib xee, thiab molybdenum ntxiv.
Thaum cov ntsiab lus chromium hauv cov hlau ntau tshaj 12 feem pua, cov hlau tsis yooj yim rau corrode thiab xeb hauv huab cua thiab dilute nitric acid. Yog vim li cas yog tias chromium tuaj yeem tsim cov yeeb yaj kiab chromium oxide nruj heev ntawm cov hlau, uas tiv thaiv cov hlau los ntawm corrosion. Cov ntsiab lus chromium hauv stainless hlau feem ntau tshaj 14 feem pua, tab sis stainless hlau tsis muaj xeb kiag li. Hauv thaj chaw ntug dej hiav txwv lossis qee qhov chaw uas muaj huab cua phem heev, thaum cov chloride ion cov ntsiab lus hauv huab cua loj, tej zaum yuav muaj qee qhov xeb ntawm cov hlau tsis muaj hlau raug rau cov huab cua, tab sis cov kab xeb no txwv rau saum npoo thiab yuav tsis erode lub internal matrix ntawm stainless hlau.
Feem ntau hais lus, cov hlau uas muaj ntau tshaj 12 feem pua Wcr muaj cov yam ntxwv ntawm cov hlau tsis muaj steel. Stainless hlau tuaj yeem muab faib ua tsib pawg raws li microstructure tom qab kev kho cua sov: ferritic stainless hlau, martensitic stainless hlau, thiab austenitic stainless hlau. , Austenitic-ferritic stainless hlau thiab nag lossis daus carbide stainless hlau.
Stainless hlau feem ntau muab faib ua:
1. Ferritic stainless hlau. Chromium 12% mus rau 30 feem pua. Nws cov corrosion kuj, toughness thiab weldability nce nrog cov ntsiab lus chromium, thiab nws cov chloride kev nyuaj siab corrosion yog zoo dua li lwm hom stainless hlau.
2. Austenitic stainless hlau. Nws muaj ntau dua 18 feem pua chromium, txog 8 feem pua nickel thiab ib qho me me ntawm molybdenum, titanium, nitrogen thiab lwm yam khoom. Nws muaj kev ua haujlwm zoo thiab tiv taus corrosion los ntawm ntau yam xov xwm.
3. Austenitic-ferritic duplex stainless hlau. Nws muaj qhov zoo ntawm ob qho tib si austenitic thiab ferritic stainless hlau, thiab muaj superplasticity.
4. Martensitic stainless hlau. Siab zog, tab sis tsis zoo plasticity thiab weldability.
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