Cov hlau tsis xeb Duplex suav txog ntau dua 80% ntawm kev siv cov qib duplex, super duplex thiab hyper duplex. Tsim tawm xyoo 1930 rau kev siv rau hauv kev tsim ntawv thiab pulp, duplex alloys yog raws li 22% Cr sib xyaw thiab cov qauv austenitic: ferritic sib xyaw uas xa cov khoom siv kho tshuab zoo.
Piv nrog rau cov hlau tsis xeb 304/316 austenitic dav dav, tsev neeg ntawm cov qib duplex feem ntau yuav muaj ob npaug ntawm lub zog thiab muab kev txhawb nqa tseem ceeb hauv kev tiv thaiv corrosion. Kev nce cov ntsiab lus chromium ntawm cov hlau tsis xeb yuav ua rau lawv cov kev tiv thaiv corrosion pitting ntau ntxiv. Txawm li cas los xij, Pitting Resistance Equivalent Number (PREN) uas cuam tshuam txog kev tiv thaiv corrosion ntawm cov hlau tsis xeb kuj suav nrog ntau lwm yam hauv nws cov mis. Qhov kev sib txawv no tuaj yeem siv los piav qhia txog qhov sib txawv ntawm UNS S31803 thiab UNS S32205 tau tsim thiab seb nws puas tseem ceeb.
Tom qab kev tsim cov hlau tsis xeb duplex, lawv cov lus qhia pib tau raug ntes ua UNS S31803. Txawm li cas los xij, ntau lub tuam txhab tsim khoom tau tsim cov qib no mus rau qhov kawg siab tshaj plaws ntawm cov lus qhia tso cai. Qhov no qhia txog lawv lub siab xav kom ua kom qhov kev ua haujlwm corrosion ntawm cov hlau alloy siab tshaj plaws, pab los ntawm kev tsim cov txheej txheem AOD steelmaking uas tso cai rau kev tswj hwm nruj dua ntawm cov khoom sib xyaw. Tsis tas li ntawd, nws kuj tso cai rau qib ntawm cov nitrogen ntxiv kom raug cuam tshuam, es tsis yog tsuas yog tam sim no ua keeb kwm yav dhau los. Yog li ntawd, qib duplex ua tau zoo tshaj plaws nrhiav kom ua kom cov qib ntawm chromium (Cr), molybdenum (Mo) thiab nitrogen (N) siab tshaj plaws. Qhov sib txawv ntawm cov hlau duplex uas cov khoom sib xyaw ua tau raws li hauv qab ntawm cov lus qhia, piv rau ib qho uas ntaus rau saum toj ntawm cov lus qhia tuaj yeem yog ntau lub ntsiab lus raws li cov mis PREN = %Cr + 3.3%Mo + 16% N.
Yuav kom paub qhov txawv ntawm cov hlau duplex stainless hlau uas tsim tawm ntawm qhov kawg ntawm cov khoom sib xyaw, ib qho lus qhia ntxiv tau qhia, uas yog UNS S32205. Cov hlau duplex stainless hlau uas ua raws li S32205 (F60) yuav ua tau raws li S31803 (F51) tag nrho, thaum qhov rov qab tsis yog qhov tseeb. Yog li ntawd, S32205 tuaj yeem tau txais daim ntawv pov thawj ob zaug ua S31803.
| Qib | Ni | Cr | C | P | N | Mn | Si | Mo | S |
| S31803 | 4.5-6.5 | 21.0-23.0 | Qhov siab tshaj plaws 0.03 | Qhov siab tshaj plaws 0.03 | 0.08-0.20 | Siab tshaj plaws 2.00 | Siab tshaj 1.00 | 2.5-3.5 | Siab tshaj plaws 0.02 |
| S32205 | 4.5-6.5 | 22-23.0 | Qhov siab tshaj plaws 0.03 | Qhov siab tshaj plaws 0.03 | 0.14-0.20 | Siab tshaj plaws 2.00 | Siab tshaj 1.00 | 3.0-3.5 | Siab tshaj plaws 0.02 |
SAKYSTEEL muaj ntau yam hlau duplex stainless hlau ua tus khub faib khoom ntawm Sandvik. Peb muaj S32205 hauv qhov loj me txij li 5/8″ txog 18″ txoj kab uas hla hauv cov hlau puag ncig, feem ntau ntawm peb cov khoom yog Sanmac® 2205 qib, uas ntxiv 'kev siv tshuab zoo dua li tus qauv' rau lwm yam khoom. Tsis tas li ntawd xwb, peb kuj muaj ntau yam S32205 hollow bar los ntawm peb lub tsev rau khoom UK, thiab phaj txog li 3″ los ntawm peb lub tsev rau khoom Portland, USA.
Lub sijhawm tshaj tawm: Lub Kaum Hli-25-2019