1. Dab tsi yog cov kev siv tseem ceeb thiab cov khoom siv zoo ntawm Hastelloy B-2 square bar nyob rau hauv ib puag ncig ua tshuaj lom neeg hnyav?
Hastelloy B-2 square bar, npib tsib xee- molybdenum alloy (kwv yees Ni-69%, Mo-28%), yog tsim tshwj xeeb rau kev txo qis acid ib puag ncig uas cov khoom siv feem ntau ua tsis tiav. Nws thawj daim ntawv thov yog nyob rau hauv fabrication ntawm tseem ceeb, high-stress Cheebtsam uas tau txais txiaj ntsig los ntawm qhov zoo ntawm geometric zoo ntawm square Tshuag. Qhov no suav nrog cov stems, agitator shafts, fasteners, twj tso kua mis, thiab kev cai machining blanks rau cov tshuaj ua, tshuaj, thiab kua qaub rov qab industries.
Qhov zoo ntawm cov khoom tseem ceeb yog:
Unmatched Resistance to Reducing Acids: Nws nthuav tawm tshwj xeeb corrosion tsis kam rau hydrochloric acid ntawm txhua qhov ntau thiab kub, suav nrog cov ntsiab lus kub. Nws kuj ua tau zoo heev nyob rau hauv sulfuric, phosphoric, thiab acetic acids nyob rau hauv uas tsis yog - oxidizing tej yam kev mob.
Resistance to Stress Corrosion Cracking (SCC): Nws muaj zog heev rau cov tshuaj chloride-induced SCC, ib hom tsis ua hauj lwm rau stainless hlau hauv acidic chloride cov kev pab cuam.
Geometric Utility of Square Form: Cov square cross-section muab cov tiaj tiaj, sib npaug rau qhov zoo tshaj plaws fixturing thiab clamping thaum machining. Nws yog qhov zoo tagnrho rau cov khoom siv uas yuav tsum tau muaj kev tsav tsheb zoo (xws li, lub valve stems tig los ntawm tus ciaj ntswj) los yog tsim cov khoom siv nrog qhov ntev. Qhov no txo qis machining pov tseg thiab lub sij hawm piv rau kev pib nrog round bar rau square Cheebtsam.
Qhov kev txwv tseem ceeb yog nws qhov tsis zoo rau oxidizing media (xws li nitric acid, ferric ntsev, chlorine ntub dej). Nws siv yog nruj me ntsis txwv rau ib puag ncig tsis muaj oxidizers.
2. Dab tsi yog qhov kev sib tw tseem ceeb tshaj plaws thaum tshuab lossis vuam cov khoom ntawm Hastelloy B-2 square bar, thiab nws tswj hwm li cas?
Ib qho kev sib tw loj tshaj plaws yog cov khoom siv siab heev rau qhov nruab nrab kub embrittlement. Qhov no tsis yog ib qho teeb meem me tab sis yog ib qho tseem ceeb ntawm metallurgical yam ntxwv. Thaum B-2 tuav lossis maj mam txias los ntawm qhov kub ntawm kwv yees li 1200℃F txog 1600℃F (650℃txog 870 degree), nws precipitates brittle intermetallic theem (feem ntau Ni₄Mo) ntawm cov ciam teb nplej. Qhov no drastic txo ductility thiab cuam tshuam toughness, ua rau cov khoom nquag mus cracking. Qhov no yog ib qho kev pheej hmoo tseem ceeb thaum vuam thiab kev kho cua sov tsis raug.
Cov tswv yim tswj xyuas:
Machining: Thaum machining nws tus kheej yog txheej txheem txias, nws tsim cov cua sov ntawm qhov kev sib tshuam. Txhawm rau tiv thaiv kev ua haujlwm hauv zos- khov thiab kub ntau dhau, siv cov kev teeb tsa nruj, cov cuab yeej carbide ntse, cov kaum sab xis zoo, qis qis, cov nqi pub ntau dua, thiab cov khoom siv siab heev - lub siab txias. Lub hom phiaj yog txiav kom ua tau zoo yam tsis muaj cua sov txaus rau hauv zos rhiab cov khoom siv.
Vuam (yog tias xav tau kiag li):
Filler Hlau: Siv cov khoom sib txuam ERNiMo-7 nkaus xwb.
Interpass Temperature: Ua kom muaj kev sib tshuam siab (feem ntau siab dua 300℃F / 150℃). Qhov kev coj ua tsis zoo no ua rau lub tshav kub -Teb chaws cuam tshuam (HAZ)saum toj noqhov embrittlement ntau thaum lub sij hawm tag nrho cov txheej txheem vuam, cia nws txias sai heev los ntawm qhov chaw txaus ntshai tom qab qhov kawg dhau.
Thaum tshav kub kub input: Siv cov txheej txheem cua sov qis (piv txwv li, GTAW/TIG) nrog cov hlaws dai.
Tshaj tawm -Kev kho cua sov (PWHT): Tsis txhob ua cov txheej txheem kev ntxhov siab. Qhov kev nyab xeeb nkaus xwb -weld kev kho mob yog tag nrho cov tshuaj anneal (kub mus rau 1850-2050℃F / 1010-1121 degree, tom qab ntawd dej quench) ntawm tag nrho cov khoom, uas feem ntau impractical rau ib qho tiav. Cov txheej txheem kev lag luam kev coj ua yog tsim rau qhov zoo li-welded mob.
Vim qhov kev sib tw loj no, kev siv B-2 tau hloov pauv ntau dua los ntawm kev tsim khoom ntau dua Hastelloy B-3 rau cov khoom siv tshiab uas muaj kev sib txuas.
3. Rau kev tu thiab kho hauv cov nroj tsuag uas twb muaj lawm nrog cov cuab yeej B-2, thaum twg nws tsim nyog siv B-2 square bar, thiab thaum twg yuav hloov tau zoo li B-3 raug txiav txim siab?
Kev xaiv ntawm B-2 thiab B-3 square bar rau kev saib xyuas yog tswj hwm los ntawm lub hauv paus ntsiab lus ntawm metallurgical compatibility thiab qhov xwm ntawm kev kho.
Siv B-2 Square Bar Thaum:
Vuam rau cov khoom siv B-2 uas twb muaj lawm: Qhov no yog txoj cai tseem ceeb tshaj plaws. Thaum tsim cov khoom siv tshiab (piv txwv li, hloov ncej) uas yuav txuas ncaj qha rau cov qauv B-2 uas twb muaj lawm, koj yuav tsum siv B-2 puag hlau thiab B-2 muab tub lim hlau (ERNiMo-7). Kev siv B-3 tuaj yeem tsim qhov sib txawv ntawm qhov sib txuas sib txuas ua rau muaj kev cuam tshuam rau galvanic corrosion nyob rau hauv qhov chaw ua haujlwm hnyav.
Cov khoom siv tshwj xeeb rau qhov tseem ceeb, Tsis yog-Welded Parts: Rau qhov ncaj qha, ntsia liaj qhov rooj - ntawm kev hloov ntawm ib feem uas tau teev tseg raws li B-2 (xws li lub qia valve), siv B-2 xyuas kom zoo zoo corrosion thiab mechanical zog, tsis txhob muaj teeb meem kev sib raug zoo lossis kev lav phib xaub.
Xav txog B-3 Square Bar Thaum:
Fabricating tiav, Tsis yog-Welded Hloov Sib Tsoo: Yog tias koj tab tom ua haujlwm tag nrho cov khoom tshiab uas yuav raug txuas nrog (xws li, bolted, haum) es tsis yog welded, B-3 feem ntau yog qhov kev xaiv zoo tshaj. Nws zoo dua tsis kam rau fabrication embrittlement ua rau nws muaj kev ruaj ntseg, ntau txhim khu kev qha cov ntaub ntawv rau qhov tshiab, piv txwv li nws cov corrosion kuj yog haum rau cov kev pab cuam (feem ntau yog, rau tib qhov chaw txo qis).
General Tshuag rau Machining Tsis yog- Cov Khoom Tseem Ceeb: Rau cov khw muag khoom npaj rau kev xeb dav dav - cov khoom tiv thaiv hauv kev txo cov kua qaub, B-3 yog cov khoom siv niaj hnub nyiam vim nws yooj yim dua ntawm kev tsim khoom.
Kev txiav txim siab yuav tsum tau ua nrog kev paub txog cov txheej txheem vuam thiab cov txheej txheem corrosion.
4. Dab tsi yog qhov tseem ceeb ntawm kev ruaj ntseg cov kauj ruam uas yuav tsum tau ua thaum muab Hastelloy B-2 square bar kom ntseeg tau tias nws ua tau raws li cov lus qhia tshwj xeeb rau kev pabcuam tseem ceeb?
Kev yuav khoom B-2 rau cov khoom tseem ceeb xav tau kev kuaj xyuas nruj vim nws qhov kev ua tau zoo thiab tus nqi siab. Cov kauj ruam tseem ceeb suav nrog:
Mill Test Certificate (MTC): Tau txais qhov siv tau, cua sov- taug qab MTC ua raws li ASTM B335. Nws yuav tsum tau lees paub:
Chemistry: Kev tshuaj xyuas tag nrho lees paub ua raws li UNS N10665 txwv, tshwj xeeb tshaj yog hlau tsawg (<2.0%) and chromium (<1.0%) to ensure proper reducing acid resistance.
Mechanical Properties: Tensile, yield, thiab elongation tus nqi.
Kev kho cua sov: Qhia meej meej tias lub bar tau muab rau hauv cov tshuaj annealed thiab sai quenched mob. Qhov no tsis yog -kev sib tham tau kom ua tiav qhov zoo tshaj plaws ductility thiab corrosion kuj.
Kev txheeb xyuas cov khoom zoo (PMI): Thaum tau txais, ua ib lub xov tooj ntawm tes X-ray fluorescence (XRF) luam theej duab ntawm ntau qhov bar ntawm qhov ntau. Qhov no txheeb xyuas cov ntsiab lus alloying thawj (Ni, Mo) thiab qhov tsis muaj qhov sib xyaw tseem ceeb -ups (xws li, tau txais cov hlau tsis muaj steel lossis C-276 bar los ntawm kev yuam kev).
Kev soj ntsuam pom thiab Dimensional: Txheeb xyuas qhov xwm txheej square geometry, ncaj, thiab qhov chaw nyob. Qhov saum npoo yuav tsum tsis muaj qhov sib sib zog nqus seams, tawg, qhov, lossis ntau dhau qhov ntsuas uas tuaj yeem npog qhov tsis xws luag hauv qab los yog ua rau lub tshuab ua tiav kawg.
Kev Tsim Nyog Muaj Peev Xwm: Tau los ntawm lub npe nrov, tshwj xeeb distributors lossis mills nrog cov ntaub ntawv pov thawj hauv kev muab siab -kev ua tau zoo nickel alloys. Lawv yuav tsum muab tag nrho traceability thiab technical support.
Rau cov ntawv thov tseem ceeb tshaj plaws, kev sim ntxiv xws li kev ntsuas kev sib xyaw ua ke ntawm ASTM G28 Txoj Kev A (rau kev tiv thaiv rau kev nkag siab) tej zaum yuav raug teev tseg, tab sis qhov no tsis tshua muaj rau cov khoom lag luam bar dua li cov phaj.
5. Los ntawm lub neej voj voog thiab tag nrho cov nqi xa mus, yog vim li cas ib tug engineer tseem yuav qhia txog cov khoom siv los ntawm cov khoom Hastelloy B-2 square bar es tsis txhob ntawm ib qho pheej yig dua, coated carbon steel lwm txoj rau kev txo cov kua qaub?
Qhov kev txiav txim siab ntawm qhov kev ntseeg siab, kev nyab xeeb, thiab tag nrho cov nqi ntawm kev ua tswv cuab (TCO), tsis yog cov nqi pib xwb.
Khoom Lub Npe: Hastelloy B-2
Tus nqi pib khoom kim heev.
Predictable, Ntev -Lub Sij Hawm Ua Haujlwm: Nws yog homogeneous, corrosion- tiv taus huab hwm coj. Nws tus nqi corrosion nyob rau hauv ib tug paub txo cov kua qaub yog tsawg heev thiab kwv yees, tso cai rau kom meej kev pab cuam lub neej forecasting. Nws tsis tuaj yeem delaminate, tev, lossis raug kev txom nyem los ntawm txheej pinholes.
Tsis Muaj Cov Txheej Txheem Tsis Ua Haujlwm: Nws tshem tawm cov kev pheej hmoo zoo li txheej txheej puas tsuaj thaum sib dhos, galvanic corrosion ntawm txheej tsis xws luag, degradation nyob rau hauv thermal cycling, los yog permeation ntawm acid los ntawm txheej ua rau tam sim ntawd, kev puas tsuaj undercutting ntawm lub substrate.
Tswj Kev Ncaj Ncees: Nws khaws tag nrho cov neeg kho tshuab lub zog thoob plaws hauv nws tus ntoo khaub lig-section.
Coated Carbon Steel Lwm txoj kev:
Tus nqi pib qis dua.
Lub neej muaj kev pheej hmoo siab thiab tsis muaj kev cia siab: Cov txheej yog cov khoom siv tau, nyias nyias nrog ntau lub ntsiab lus tsis ua haujlwm. Nws tsis ua hauj lwm feem ntau ua rau ceev ceev, localized nres ntawm cov pa roj carbon steel substrate, ua rau tam sim ntawd los yog cov yam ntxwv tsis ua hauj lwm. Kev tshuaj xyuas yog qhov nyuaj, thiab kev pabcuam lub neej tsis paub meej.
High Maintenance Liability: Yuav tsum muaj kev tshuaj xyuas tsis tu ncua, cuam tshuam thiab muaj peev xwm rov ua dua, ua rau lub sijhawm poob qis.
Xaus: Rau qhov tseem ceeb, nyuaj- mus rau- nkag, lossis siab - kev nyab xeeb- qhov tshwm sim hauv cov kev pabcuam acid txo qis (piv txwv li, lub ncej hauv lub zog HCl reactor), kev ntseeg siab thiab kev saib xyuas tsawg kawg ntawm B-2 ua pov thawj nws cov nqi. Tus nqi ntawm ib qho kev kaw tsis tau npaj tseg, qhov xwm txheej ib puag ncig, lossis kev nyab xeeb tshwm sim los ntawm cov txheej txheem tsis ua haujlwm yuav ua rau ntau tshaj qhov kev txuag nyiaj ua ntej. Cov khoom siv alloy muab qhov kev nyab xeeb thiab kev ua haujlwm ruaj khov, uas yog qhov tseem ceeb ntawm nws cov lus pom zoo.
