ASTM B861 Qib 7 Titanium Alloy Seamless Wastewater Pipes
Oct 17, 2025
ASTM B861 Qib 7 Pipe yog dab tsi
ASTM B861 npog seamless thiab welded titanium thiab titanium alloy yeeb nkab rau kev xeb dav dav - tiv thaiv thiab siab siab - kev pabcuam kub. Qib 7 (UNS R52400, W.Nr. 3.7235) yog kev lag luam ntshiab titanium hloov nrog 0.12-0.25% palladium, thiab raug xaiv Ti-0.15Pd. Lub palladium ntxiv hloov cov hlau mus rau hauv cathodic ntau yam, txhawb kev rov qab sai ntawm cov oxide zaj duab xis hauv kev txo cov kua qaub thiab cov kab mob crevice uas tsis muaj titanium tawg. Qhov tshwm sim yog cov yeeb nkab nrog tib lub formability thiab weldability raws li Qib 2 tab sis kuj zoo dua rau pitting, crevice corrosion, thiab kev ntxhov siab corrosion tawg nyob rau hauv kub chlorides thiab tsis muaj zog txo acids.
Tshuaj muaj pes tsawg leeg (ASTM B861)
| Element | Limit (max %, tshuav Ti) |
|---|---|
| Palladium (zeeg) | 0.12-0.25 |
| Hlau (Fe) | 0.30 |
| Cov pa oxygen (O) | 0.25 |
| Cov pa roj carbon (C) | 0.08 |
| Nitrogen (N) | 0.03 |
| Hydrogen (H) | 0.015 |
| Residuals, txhua / tag nrho | 0.10 / 0.40 |
Mechanical Properties
Qib 7 yeeb nkab yog muab nyob rau hauv lub annealed mob nrog yam tsawg kawg nkaus tensile zog ntawm 345 MPa (50 ksi), yam tsawg kawg nkaus yield zog ntawm 275 MPa (40 ksi) ntawm 0.2% offset, thiab yam tsawg kawg nkaus elongation ntawm 20% nyob rau hauv 50 mm. Qhov ceev yog 4.51 g / cm3, kwv yees li 60% ntawm carbon steel. Cov txiaj ntsig no sib phim Qib 2, yog li cov kav dej tuaj yeem tsim nrog cov kev cai ntawm phab ntsa tuab tib yam thaum tau txais cov npoo npoo ntawm cov palladium ntxiv.
Vim li cas Qib 7 rau cov kab dej khib nyiab thiab tshuaj lom neeg
Cov dej khib nyiab nqa cov tshuaj chlorides, sulfides, cov chlorine ntub dej, thiab qis -pH ntws uas pit stainless hlau thiab crevice-corrode standard titanium. Qib 7 yeeb nkab tau teev tseg rau cov tshuab chlorination, flue gas scrubbers, qhov hluav taws xob ducting, stack liners, acid ntau lawm thiab pickling kab, pulp thiab ntawv bleach nroj tsuag, thiab nuclear roj reprocessing kev pab cuam. Hauv cov brine kub thiab dej hiav txwv kub exchangers, lub palladium ntxiv suppresses crevice nres ntawm raj - mus rau -tubesheet pob qij txha, uas yog hom tsis ua hauj lwm tseem ceeb ntawm Qib 2 hauv lub luag haujlwm ntawd.
Cov ntaub ntawv tsim khoom thiab kev tsim khoom
Qhia meej seamless yeeb nkab rau ASTM B861, lossis welded yeeb nkab rau ASTM B862, nrog qhov ntev hauv NPS lossis metric OD, thiab teem caij rau tus qauv tsim.
Yuav tsum tau EN 10204 hom 3.1 zeb daim ntawv pov thawj npog chemistry, tensile tau, flattening, thiab hydrostatic kuaj; hom 3.2 nrog thib peb -tog tim khawv qhov twg qhov project thov nws.
Weld nrog argon shielding ntawm ob sab thiab txuam ERTi-7 muab tub lim; khaws qhov kub ntawm qhov sib txawv thiab paub meej tias cov xim xim yog nyiaj los yog lub teeb straw raws li kev kuaj kab mob.
Paub meej tias muaj nyob rau hauv qhov yuav tsum tau muaj ntau yam: seamless yeeb nkab los ntawm 1/4 "NB upward, phab ntsa thicknesses los ntawm Teem caij 10 mus rau Teem caij 160, thiab ntev raws li random los yog txiav lengths.
FAQ
Dab tsi yog qhov txawv ntawm Qib 7 thiab Qib 2 titanium yeeb nkab?
Qib 7 ntxiv 0.12-0.25% palladium rau Qib 2 chemistry. Cov cuab yeej cuab yeej cuab tam zoo ib yam, tab sis Qib 7 tiv thaiv kev xeb thiab txo cov kua qaub zoo dua, yog li nws nyiam cov dej khib nyiab, kub brine, thiab cov kab ua tshuaj.
Puas yog Qib 7 titanium yeeb nkab weldable?
Yog lawm. Qib 7 muaj tib qhov weldability zoo li Qib 2. Siv ERTi-7 muab tub lim thiab argon shielding rau hauv paus thiab sab nraub qaum; tom qab vuam tu thiab tshuaj xyuas xim yog tib yam li rau lwm qib titanium.
Cov qauv twg npog Qib 7 yeeb nkab?
ASTM B861 (seamless yeeb nkab), ASTM B862 (welded yeeb nkab), thiab ASTM B338 (tub rau condensers thiab tshav kub exchangers), nrog rau ASME sib npaug SB861, SB862, thiab SB338 rau siab siv.
Vim li cas palladium ntxiv rau titanium?
Palladium ua raws li kev hloov kho cathodic uas ua kom cov titanium nto nyob rau hauv qhov chaw tsis muaj zog, yog li cov oxide zaj duab xis re- cov ntaub ntawv sai sai yog tias puas. Qhov no suppresses pitting thiab crevice nres nyob rau hauv kub chlorides thiab qaug zog txo acids.
Thaum twg kuv yuav tsum xaiv Qib 12 tsis yog Qib 7?
Qib 12 (Ti-0.3Mo-0.8Ni, UNS R53400) yog kwv yees li 40% muaj zog dua li Qib 7 thiab tiv taus crevice corrosion nyob rau hauv kub brine ntawm nruab nrab kub. Xaiv Qib 12 thaum lub siab ntsuas los yog phab ntsa thickness tsav tus tsim; xaiv Qib 7 rau qhov siab tshaj plaws corrosion margin hauv chloride thiab txo cov kua qaub.
