Hastelloy thiab nws cov kev faib tawm thiab kev saib xyuas
Hastelloy nws tus kheej yog nickel-based alloy, tab sis nws txawv ntawm cov nickel ntshiab (Ni200) thiab Monel. Nrog chromium thiab molybdenum ua cov ntsiab lus alloy, nws yog tsim los txhim kho adaptability rau ntau yam xov xwm thiab kub, thiab tau tshwj xeeb optimized rau txawv industries. Tam sim no, kev lag luam tshuaj lom neeg feem ntau nrhiav kev muaj peev xwm ntau lawm, txhim kho cov txheej txheem tas li, nce qhov kub thiab txias, thiab ua kom cov tshuaj tiv thaiv nrawm, ua rau cov khoom lag luam ua rau cov xwm txheej tsis txaus ntseeg thiab ua rau kev kho tsis tau. Hastelloy yog tsim los ua kom tau raws li cov kev xav tau, hloov mus rau ntau qhov chaw tsis muaj kev cia siab thiab hnyav, thiab txo qis kev saib xyuas tsis tau npaj tseg. Nyob rau tib lub sijhawm, nws kuj muaj kev ua haujlwm zoo thiab kev ua haujlwm vuam, uas ua rau kev saib xyuas ntawm qhov chaw.
Carbide kev faib tawm Tam sim no, corrosion-resistant cemented carbide feem ntau muab faib ua C series, B series, G series thiab D series. Table 1 teev cov muaj pes tsawg leeg ntawm ib co feem ntau siv hardstone alloys.
C-series alloy yog Ni-Cr-Mo alloy. Txij li thaum chromium tuaj yeem tsim cov oxide zaj duab xis ntom ntom (passivation) ntawm cov hlau nplaum, nws muaj peev xwm tiv thaiv oxidation, thaum molybdenum feem ntau muab kev tiv thaiv kev txo qis. Yog li, C-series alloys tuaj yeem siv rau hauv ob qho tib si oxidizing thiab txo cov xov xwm. C series alloys yog cov khoom siv dav tshaj plaws, tshwj xeeb tshaj yog C-276 alloys. Tom qab lawv tsim nyob rau xyoo 1960, C series alloys tseem qhia tau tias muaj zog tom qab ntau tshaj 40 xyoo ntawm kev sim. C-4 tau tsim los ua kom tau raws li cov kev xav tau ntawm cov neeg siv European tsawg thiab tam sim no tsuas yog siv hauv cov khoom qub. Yog tsis muaj tus nqi nce ntxiv, qhov kev tiv thaiv corrosion ntawm C-22 alloy yog txhim kho, thiab tus nqi-kev ua tau zoo yog qhov tshwj xeeb. C-2000? Raws li cov khoom tsim tshiab, nws muab ntau yam kev nyab xeeb siv thiab tsim nyog rau cov neeg siv kom ntev lub neej ntawm cov cuab yeej siv thiab sim cov thev naus laus zis tshiab. Tam sim no, C-series alloys tau siv ntau lub lag luam hauv kuv lub tebchaws. Xws li cov tshuaj zoo (TDI, PTA, acetic anhydride, acrylic acid, thiab lwm yam); ib puag ncig engineering kev lag luam (flue gas desulfurization, dej phwj kho); phaj kub exchanger kev lag luam. Nws tau raug siv nyob rau hauv ntau lub lag luam txawv teb chaws, tab sis nws tseem nyob rau hauv kev sim theem domestically, xws li kev lag luam kws tshuaj.
B-series alloys yog npib tsib xee-molybdenum alloys uas muaj qhov zoo tshaj plaws corrosion kuj nyob rau hauv tag nrho cov cheeb tsam. Thaum B-series alloys ua tau zoo hauv kev txo qhov chaw, lawv muaj kev tiv thaiv zoo rau oxidizing media (hlau, thiab lwm yam). 50 ppm hlau ions zoo heev txo cov corrosion kuj ntawm B-series alloys. B series alloys muaj cov ntaub ntawv tseem ceeb vim lawv cov khoom tshwj xeeb. Qhov tseem ceeb tshaj plaws ntawm cov no yog kev tsim cov acetic acid (oxo synthesis), thiab ntau cov sulfuric acid rov ua haujlwm kuj tseem siv cov txheej txheem no. Tam sim no, cov khoom siv dav dav B-3B-2 tau maj mam thim tawm ntawm kev ua lag luam vim nws txoj kev ua haujlwm tsis zoo.
G series alloys yog npib tsib xee-chromium-hlau alloys (tshwj tsis yog G-35)? alloy). Cov ntsiab lus siab chromium muab cov khoom siv no zoo heev oxidation kuj. Nyob rau tib lub sijhawm, G series alloy tshiab (G-30? G-35?) kuj muaj pitting corrosion kuj zoo, muaj tooj liab tsawg, thiab txhim kho kev tiv thaiv sulfuric acid thiab hydrofluoric acid. Yog li ntawd, G series alloys yog tsuas yog siv nyob rau hauv muaj zog oxidizing ib puag ncig thiab complex tov kua qaub ib puag ncig, xws li ntub phosphoric acid thiab steel cog pickling kab.
D series alloy yog Ni-Cr-Si alloy. Txij li cov koob no ntawm cov alloys muaj qee qhov nyiaj ntawm silicon, nws tuaj yeem tsim cov yeeb yaj kiab oxide ruaj khov rau ntawm qhov chaw. Nws yog qhov tsim nyog rau qhov muaj zog oxidizing ib puag ncig, tab sis nws nyuaj rau vuam HART alloy kav. Tam sim no, D series alloy yog D-205 alloy, uas yog tsim rau phaj kub exchangers nyob rau hauv high-temperature concentrated sulfuric acid ib puag ncig. Lub alloy tam sim no tsuas yog sawv cev los ntawm Afrafa thiab tsuas yog cov panels tiav lawm.
Hastelloy txuas ntxiv txhim kho thiab cov khoom siv hlau tshiab tau tsim los txhawb kev txhim kho kev lag luam. Nws muaj qhov zoo ib puag ncig adaptability thiab txhim khu kev qha corrosion kuj. Lub hom phiaj kev daws teeb meem rau qhov tshwj xeeb ib puag ncig ntawm kev lag luam sib txawv. Raws li cov khoom lag luam paub tab, Hastelloy muaj ntau yam khoom siv uas tuaj yeem ua tau raws li ntau yam kev xav tau.
