Duplex stainless hlau, xa mus rau DSS, hais txog cov hlau tsis xeb nrog ferrite thiab austenite, txhua tus suav txog kwv yees li 50%. Feem ntau, cov ntsiab lus ntawm tsawg dua qib yuav tsum tsawg kawg 30%. Nyob rau hauv rooj plaub ntawm cov ntsiab lus C qis, cov ntsiab lus Cr yog 18% rau 28% thiab cov ntsiab lus Ni yog li 3% rau 10%. Qee cov tub luam hlau kuj tseem muaj cov ntsiab lus xws li Mo, Cu, Nb, Ti, thiab N.
Cov hom hlau no muaj cov yam ntxwv ntawm austenitic thiab ferritic stainless hlau. Piv nrog ferrite, nws muaj ntau dua plasticity thiab toughness, tsis muaj chav sov brittleness, thiab txhim kho qhov kev cuam tshuam ntawm kev txhim kho corrosion thiab vuam kev ua haujlwm, thaum tswj cov hlau 475 ℃ brittleness, siab thermal conductivity thiab lub ntsiab superplasticity stainless hlau. Piv nrog rau austenitic stainless hlau, nws muaj lub zog muaj zog thiab txhim kho ntau yam tsis kam rau kev cuam tshuam corrosion thiab chloride kev nyuaj siab corrosion. Duplex stainless hlau muaj kev tiv thaiv zoo rau pitting corrosion thiab tseem yog nickel-txuag stainless hlau.
Txhua yam khoom muaj nws cov keeb kwm kev txhim kho, thiab cov hlau duplex tsis muaj kev zam. Peb tuaj yeem nug txog cov ntsiab lus raws li Baidu Encyclopedia: Duplex stainless hlau tau tsim rau cov neeg thib peb txij li nws yug los hauv Tebchaws Asmeskas thaum xyoo 1940. Nws cov cim tseem ceeb yog tias qhov ywj tsis pub tuaj yeem ncav cuag 400-550MPa, uas yog ob zaug uas zoo tib yam stainless hlau, yog li nws tuaj yeem txuag cov khoom siv thiab txo cov khoom tsim khoom lag luam. Nyob rau hauv cov nqe lus ntawm corrosion tsis kam, tshwj xeeb tshaj yog nyob rau hauv ib puag ncig hnyav (xws li seawater thiab siab chloride ion ntsiab lus), cov tsis kam mus rau pitting, crevice corrosion, kev nyuaj siab corrosion thiab corrosion qaug zog ntawm duplex stainless hlau nws yog qhov zoo dua li cov hlau tsis muaj steel. Austenitic stainless hlau yog sib piv nrog high-alloy austenitic stainless hlau.
