Vim li cas Qib 2 Kev Lag Luam Dawb Huv Titanium yog qhov kev xaiv zoo tshaj plaws rau cov txheej txheem tshuaj yeeb
1. Superior Corrosion Resistance nyob rau hauv Common Chemical Process Media
Txo acid compatibility: Feem ntau ntawm cov txheej txheem tshuaj muaj xws li txo cov kua qaub xws li dilute hydrochloric acid (HCl), sulfuric acid (H₂SO₄), thiab phosphoric acid (H₃PO₄), uas yog siv rau hauv kev tsim chiv, hlau pickling, thiab tshuaj synthesis. Tsis zoo li Qib 4 (uas muaj cov ntsiab lus oxygen interstitial ntau dua thiab muaj zog dua electrochemical reactivity), Qib 2 tuav cov zaj duab xis ruaj khov nyob rau hauv cov uas tsis yog -oxidizing acidic ib puag ncig, nrog rau corrosion feem ntau qis dua 0.05 mm / xyoo ntawm qhov kub thiab txias. Piv txwv li, nyob rau hauv 10% H₂SO₄ ntawm 25 degree, Qib 2 qhia tau hais tias tsis muaj kev cuam tshuam dav dav, thaum Qib 4 tuaj yeem ntsib qhov tawg thiab tawg tom qab lub sijhawm ntev. Qhov kev ruaj ntseg no tiv thaiv cov yeeb nkab phab ntsa tsis ntxov ntxov ntxov thiab muaj peev xwm xau ntawm cov tshuaj phom sij.
Chloride-induced localized corrosion kuj: Chemical plants often process brine, seawater (for cooling), or chloride-containing process streams, where pitting and crevice corrosion are major failure risks for metallic piping. Grade 2 has a higher critical crevice temperature (CCT, ~80–85°C in 3.5% NaCl) and critical pitting temperature (CPT, >100℃hauv 10% NaCl) piv rau Qib 4 (CCT ~ 75-80 degree, CPT ~ 95 degree). Qhov no txhais tau hais tias Qib 2 cov kav dej tuaj yeem tiv taus qhov kub siab dua hauv cov tshuaj chloride- cov tshuab nplua nuj yam tsis muaj kev cuam tshuam hauv zos, qhov txiaj ntsig tseem ceeb rau cov khoom siv hluav taws xob sib hloov, cov kab reactor effluent, thiab cov kav dej xa mus.
Hydrogen embrittlement mitigation: Ntau cov txheej txheem tshuaj muaj xws li cathodic tiv thaiv systems lossis hydrogen- tsim cov tshuaj tiv thaiv (piv txwv li, catalytic hydrogenation), uas nthuav tawm cov kav dej rau atomic hydrogen. Qib 2 qhov qis interstitial impurity cov ntsiab lus (oxygen: 0.12–0.18 wt%, nitrogen: Tsawg dua los yog sib npaug rau 0.03 wt%) slows hydrogen diffusion los ntawm titanium matrix, txo qhov kev pheej hmoo ntawm hydride tsim thiab brittle puas. Hauv qhov sib piv, Qib 4's denser lattice (los ntawm cov ntsiab lus oxygen siab dua, 0.18–0.25 wt%) ua kom cov hydrogen ingress, ua rau nws yooj yim rau embrittlement nyob rau hauv ntev -lub sij hawm hydrogen- raug siv cov kav dej.
2. Optimized Formability thiab Fabrication Suitability rau Piping Systems
Txhim kho ductility thiab formability: Qib 2 muaj qhov elongation siab dua thaum tawg (Ntau dua lossis sib npaug li 20%) thiab qis zog tawm los (Ntau dua lossis sib npaug rau 275 MPa) piv rau Qib 4 (elongation Ntau dua lossis sib npaug li 15%, yield zog Ntau dua lossis sib npaug li 450 MPa). Qhov no tso cai rau Qib 2 kom txias - ua rau hauv cov yeeb nkab geometries (xws li, lub luj tshib, tees, reducers) yam tsis muaj kev tawg lossis ua haujlwm tawv, qhov txiaj ntsig tseem ceeb rau kev tsim cov kav dej sib txuas hauv cov nroj tsuag tshuaj. Qib 4 lub zog siab dua thiab qis dua ductility ua rau muaj kev pheej hmoo ntawm kev puas tsuaj thaum khoov lossis nthuav dav, yuav tsum tau ua cov kauj ruam kho cua sov ntxiv uas nce cov nqi tsim khoom thiab cov sij hawm txhuas.
Weldability rau leak- nruj pob qij txha: Chemical piping xav tau 100% leak-cov ntaub ntawv pov thawj los tiv thaiv kev tso tawm cov tshuaj lom lossis cov tshuaj tua hluav taws. Qib 2 nthuav tawm qhov zoo tshaj plaws weldability ntawm cov txheej txheem sib xws (GTAW/TIG, GMAW/MIG) nrog tsawg kawg nkaus ncej-weld heat treatment (PWHT) yuav tsum tau. Nws cov ntsiab lus interstitial qis minimizes weld cheeb tsam embrittlement thiab xyuas kom lub passive zaj duab xis hloov kho uniformly thoob welds, tswj corrosion kuj nyob rau hauv cov cheeb tsam sib koom ua ke. Qib 4 cov ntsiab lus ntawm cov pa oxygen ntau dua yuav ua rau muaj feem cuam tshuam ntawm weld porosity thiab txo cov weld ductility, yuav tsum tau tswj cov txheej txheem nruj thiab tom qab-weld annealing kom rov ua haujlwm tau zoo- cov kauj ruam uas cuam tshuam rau kev tsim khoom thiab qhia txog kev pheej hmoo zoo rau cov kav dej tseem ceeb.
Seamless raj manufacturability: Feem ntau siab -cov purity purity piping siv seamless titanium raj los tshem tawm weld-txog qhov tsis xws luag. Qib 2 lub zog qis ua rau tus nqi- ua haujlwm seamless extrusion thiab pilgering cov txheej txheem, ua kom cov phab ntsa tuab zoo ib yam thiab qhov tseeb qhov tseeb rau qhov siab - ntsuas cov kav dej. Qib 4 lub hardness siab dua yuav tsum muaj zog ntau dua -kev tsim khoom hnyav, ua rau cov nqi tsim khoom ntau dua li 15–20% piv rau Qib 2, nrog kev pheej hmoo ntau dua ntawm qhov sib txawv ntawm qhov sib txawv uas cuam tshuam rau kev ncaj ncees siab.
3. Kev sib piv nrog Qib 4: Cov ntsiab lus rau Qib 4 Kev Siv Piping txwv
