cov khoom muab los ntawm GNEE
ASTM B338 Alloy Gr7 Titanium yeeb nkab
Siab -lub zog Gr 2 Gr 5 Gr 7 Titanium Phaj
UNS R52400 (ASTM B861 Qib 7) Titanium Seamless Yeeb Nkab: Palladium-Alloyed Corrosion Resistance
UNS R52400 yog kev sib koom ua ke ntawm tus lej tsim rau ASTM B861 Qib 7 titanium - kev lag luam ntshiab titanium puag alloyed nrog 0.12 txog 0.25% palladium. Los ntawm kev ntxiv me me ntawm cov hlau noble, Qib 7 txuas ntxiv cov electrochemical passivity ntawm titanium rau hauv ib puag ncig uas cov qib tsis sib xws yuav ua rau corrode: txo cov kua qaub, kub chloride brines, dej hiav txwv thiab qaub (H₂S-cov kabmob) kev pabcuam. Qhov tshwm sim yog ib qho kev txhim kho corrosion ntau tshaj -cov ntaub ntawv piping resistant muaj rau xav tau tshuaj thiab cov txheej txheem marine.
Vim li cas Palladium ntxiv rau Qib 7
Ntshiab titanium tsim ib qhov ntom ntom, tus kheej - kho TiO₂ zaj duab xis passive uas muab kev ua haujlwm zoo hauv oxidizing media. Hauv kev txo cov kua qaub - xws li dilute sulfuric los yog hydrochloric acid - thiab nyob rau hauv kub concentrated chlorides, zaj duab xis no tuaj yeem tawg hauv zos. Palladium ua raws li kev hloov kho cathodic: nws hloov cov peev txheej corrosion mus rau hauv qhov chaw tsis muaj zog, tiv thaiv kev ua kom tawg txawm tias cov oxide zaj duab xis puas lawm. Cov txheej txheem no muab Qib 7 ntsuas qhov txiaj ntsig zoo dua qib 1, 2 thiab 3 hauv kev txo qis thiab ciam teb-oxidizing chemistry, thaum khaws cov formability thiab weldability ntawm unalloyed titanium.
Qib Qib thiab Chemistry
| Element (max, %) | ASTM B861 Qib 7 (UNS R52400) |
|---|---|
| Titanium | Tshuav |
| Palladium (zeeg) | 0.12 – 0.25 |
| Nitrogen | 0.03 |
| Cov pa roj carbon | 0.08 |
| Hydrogen | 0.015 |
| Hlau | 0.30 |
| Oxygen | 0.25 |
Mechanical Properties (Annealed)
| Khoom | Qib 7 (UNS R52400) |
|---|---|
| Tensile zog, min | 345 MPa (50 ksi) |
| Yield zog (0.2% offset), min | 275 MPa (40 ksi) |
| Elongation hauv 50 mm, min | 20% |
Seamless Yeeb Nkab Txheem: ASTM B861 vs. Welded B862 / B338
ASTM B861 npogseamlesstitanium thiab titanium- alloy yeeb nkab; ASTM B862 npogweldedCov yeeb nkab, thiab ASTM B338 npog welded thiab seamless tubing feem ntau yog npaj rau cov cua kub exchangers thiab condensers. Rau cov dej khib nyiab los yog tshuaj lom neeg - txheej txheem kav dej, seamless B861 yeeb nkab feem ntau tau teev tseg qhov twg cov hlua khi yuav tsum tau zam hauv kev pabcuam corrosive, thaum B862 welded yeeb nkab muab kev xaiv kev lag luam rau cov kab loj loj. ASME SB861 / SB862 / SB338 yog cov ntawv Code sib raug rau cov ntawv thov siab.
Ib puag ncig kev pabcuam
Flue-gas desulfurization (FGD) systems: scrubbers, stack liners, dampers, reheater tubes thiab kiv cua vaj tse
Kev kho dej khib nyiab thiab kev ua qias tuaj - tswj cov kav dej kom raug cov tshuaj chlorides thiab qis - pH ntws
Pickling thiab kua qaub- cov kab ntau lawm, qhov twg cov kua qaub txo cov kua qaub yog daws
Chlor-alkali thiab ntub- cov kev pabcuam chlorine, suav nrog qhov hluav taws xob ducting thiab weld overlays ntawm cov hlau tsis tshua muaj zog
Cov qhov dej qaub qaub thiab tsim tawm - cov kav dej nrog H₂S thiab cov ntsiab lus chloride
Pharmaceutical thiab zaub mov- ua cov tubing qhov twg corrosion- yuav tsum zam kom tsis txhob muaj kev sib kis
Muaj Qhov Loj thiab Cov Ntawv Xa Khoom
| Parameter | Ntau yam |
|---|---|
| Seamless yeeb nkab (B861) | 1/4 in. NB to 12 in. NB |
| Welded / ERW yeeb nkab (B862) | 1 in. NB to 16 in. NB |
| Phab ntsa thickness | Teem caij 10 txog Teem caij 160 |
| Ntev | 5-7 m, 9-13 m, ib leeg / ob chav random, lossis kev cai |
| Xaus | Plain los yog beveled |
| Kev xa khoom | Annealed (tus qauv), txias kos, kev ntxhov siab relieved |
| Nto tiav | Pickled, polished, satin, passivated |
Cov kev tsim nyog niaj hnub suav nrog kev sim tensile, flattening, flare, hydrostatic thiab eddy -tam sim no cov tshev rau B861, nrog rau cov ntaub ntawv pov thawj uas tau tshaj tawm raws li EN 10204 3.1 (los yog 3.2 thaum tus neeg yuav khoom - xaiv tsa tus neeg sab nraud thib peb- tog neeg soj ntsuam lub koom haum ua pov thawj qhov kev xeem).
Kev Taw Qhia Xaiv
Thaum cov txheej txheem xov xwm muaj zog oxidizing - seawater, ntub chlorine, nitric acid - tus qauv Qib 2/3 ib txwm txaus ntawm tus nqi qis. Qhia rau Qib 7 (R52400) thaum chemistry txo qis los yog ciam teb: dilute sulfuric/hydrochloric acids, kub chloride-nplua nuj brines, FGD scrubber cawv los yog qaub-gas ib puag ncig. Qib 7 yeeb nkab tuaj yeem welded nrog tib cov txheej txheem thiab muab tub lim- tsev neeg hlau li tsis muaj titanium, thiab nws khaws cia zoo heev formability, ua rau nws ib tug tswv yim txawj tej yam ntxiv nyob rau hauv qhov twg unalloyed qib muaj kev pheej hmoo ntawm kev tawm tsam.
Titanium khoom muab los ntawm GNEE
| Yam khoom | Common Qib (Tswj) | Thawj ASTM Standards | Txheem Specifications / Dimensions | Muaj Cov Duab / Hom | Nto tiav |
|---|---|---|---|---|---|
| Titanium Tube | Gr.1, Gr.2, Gr.3, Gr.7, Gr.9, Gr.12, Gr.5 (Ti-6Al-4V) | ASTM B 338 Cov | OD:1mm - 150 hli Phab ntsa Thickness:0.5 hli - 15mm Ntev:Txog li 15,000mm |
Seamless Tube, Welded Tube, Kub Exchanger Tubes, Condenser Tubes | Pickled, Polished (Mill / Daim iav), Annealed, Ci |
| Titanium Bar | Gr.1, Gr.2, Gr.5 (Ti-6Al-4V), Gr.7, Gr.9, Gr.12 | ASTM B 348 Cov khoom siv | Txoj kab uas hla:3mm - 300 hli Ntev:3,000mm los yog kev cai |
Round Bar, Square Bar, Hexagonal Bar, Hlau Qws, Forged Billets | Dub (kub dov), tig, Polished, Centerless av, Peeled |
| Titanium Sheet / Phaj | Gr.1, Gr.2, Gr.5 (Ti-6Al-4V), Gr.7, Gr.9, Gr.12 | ASTM B265 | Thickness:0.1 hli - 100mm+ Dav:Txog li 2,000mm Ntev:Txog li 6,000mm |
Sheet (≤ 4.76mm), Plate (>4.76mm), Coil / Sawb, Shim Tshuag | Kub Rolled, Txias Rolled, Pickled, Sandblasted, Polished, Txhuam |
| Titanium ntawv nyiaj | Gr.1, Gr.2 | ASTM B265 | Thickness:0.03mm - 0.1 hli Dav:Txog li 500mm |
Ntawv ci, Sawb | Txias Rolled, Annealed, Bright |
| Titanium hlau | Gr.1, Gr.2, Gr.5 (Ti-6Al-4V) | ASTM B863, F67 (rau kev kho mob) | Txoj kab uas hla:0.1mm - 8.0 hli Daim ntawv:Coil, Spool, Ncaj Ntev |
Vuam hlau, Caij nplooj ntoos hlav hlau, Fastener hlau, nuv ntses hlau | Pickled, Acid ntxuav, Polished |
| CNC Machined Parts | Gr.2, Gr.5 (Ti-6Al-4V), Gr.9, Gr.12 | ASTM B348 (Bar Tshuag), Kev Cai | Muaj peev xwm:Prototype rau Mass Production Kev kam rau siab:Raws li tus neeg siv khoom kos duab |
Flanges, Fittings, li qub, bolts, ceev, Custom Components Machined los ntawm billet / bar / phaj |
Raws li -machined, Sandblasted, Polished, Anodized, Bead Blasted |
Tau txais qhov kev tsocai tshiab kawg
