Duplex stainless steels account rau> 80% ntawm kev noj ntawm duplex, super duplex thiab hyper duplex qib. Tsim nyob rau hauv 1930's rau daim ntawv thov nyob rau hauv daim ntawv thiab cov khoom siv pulp, duplex alloys yog nyob ib ncig ntawm 22% Cr muaj pes tsawg leeg thiab cov sib xyaw austenitic: ferritic microstructure uas xa cov khoom tsim nyog.
Piv nrog rau cov generic 304/316 austenitic stainless steels, tsev neeg ntawm duplex qib feem ntau yuav muaj ob zaug lub zog thiab muab ib tug tseem ceeb uplift nyob rau hauv corrosion kuj. Ua kom cov ntsiab lus chromium ntawm stainless hlau yuav ua rau lawv cov pitting corrosion kuj. Txawm li cas los xij, Pitting Resistance Equivalent Number (PREN) uas cuam tshuam cov hlau tsis kam rau pitting corrosion kuj suav nrog ntau lwm cov ntsiab lus hauv nws cov qauv. Qhov kev txiav txim siab no tuaj yeem siv los piav qhia qhov txawv ntawm UNS S31803 thiab UNS S32205 tau tsim thiab seb nws puas tseem ceeb.
Tom qab kev txhim kho ntawm duplex stainless hlau, lawv thawj qhov tshwj xeeb tau raug ntes raws li UNS S31803. Txawm li cas los xij, ntau lub tuam txhab ua lag luam tau tsim cov qib no mus rau qhov kawg ntawm qhov kev tso cai tshwj xeeb. Qhov no qhia txog lawv lub siab xav ua kom muaj qhov ua tau zoo tshaj plaws ntawm cov hlau alloy, pab los ntawm kev txhim kho ntawm AOD steelmaking txheej txheem uas tso cai rau kev tswj nruj dua ntawm kev sib xyaw. Tsis tas li ntawd, nws tseem tso cai rau qib ntawm nitrogen ntxiv kom cuam tshuam, tsis yog tam sim no raws li keeb kwm yav dhau los. Yog li ntawd, qhov ua tau zoo tshaj plaws duplex qib nrhiav kom ua kom cov qib chromium (Cr), molybdenum (Mo) thiab nitrogen (N). Qhov sib txawv ntawm duplex alloy uas nws muaj pes tsawg leeg ua tau raws li hauv qab ntawm cov specification, piv rau ib qho uas hits rau sab saum toj ntawm cov specification yuav ua tau ob peb lub ntsiab lus raws li cov mis PREN = % Cr + 3.3 % Mo + 16 % N.
Yuav kom sib txawv ntawm cov duplex stainless hlau tsim nyob rau sab saum toj kawg ntawm cov khoom muaj pes tsawg leeg, ib qho kev qhia ntxiv tau qhia, uas yog UNS S32205. Duplex stainless hlau ua rau S32205 (F60) kab lus yuav ua tau raws li S31803 (F51) kab lus, qhov rov qab tsis muaj tseeb. Yog li S32205 tuaj yeem ua tau ob daim ntawv pov thawj raws li S31803.
| Qib | Ni | Cr | C | P | N | Mn | Si | Mo | S |
| S31803 | 4.5-6.5 | 21.0-23.0 Nws | Max 0.03 | Max 0.03 | 0.08-0.20 Nws | Max 2.00 Nws | Max 1.00 Nws | 2.5-3.5 | Max 0.02 |
| S32205 | 4.5-6.5 | 22-23.0 Nws | Max 0.03 | Max 0.03 | 0.14-0.20 Nws | Max 2.00 Nws | Max 1.00 Nws | 3.0-3.5 | Max 0.02 |
SAKYSTEEL Tshuag muaj ntau yam ntawm duplex stainless hlau raws li tus nyiam faib tus khub ntawm Sandvik. Peb Tshuag S32205 nyob rau hauv qhov ntau thiab tsawg los ntawm 5/8 "mus txog 18" txoj kab uas hla nyob rau hauv round bar, nrog rau feem ntau ntawm peb cov Tshuag nyob rau hauv lub Sanmac® 2205 qib, uas ntxiv 'enhanced machinability raws li tus qauv' rau lwm yam khoom. Tsis tas li ntawd, peb kuj tau npaj ntau yam ntawm S32205 hollow bar los ntawm peb lub tsev khaws khoom UK, thiab phaj mus txog 3 "los ntawm peb lub tsev khaws khoom Portland, Tebchaws Asmeskas.
Post lub sij hawm: Oct-25-2019