1. Dab tsi yog qhov tseem ceeb ntawm metallurgical tus kheej thiab tsim kev xav ntawm Incoloy 330 thiab 25-6HN?
Ob lub alloys no yog tsim los rau qhov tshwj xeeb, xav tau ib puag ncig, tab sis lawv daws cov teeb meem sib txawv.
Incoloy 330 (UNS N08330): Qhov no yog npib tsib xee-hlau-chromium, khoom- kev daws teeb meem alloy. Nws lub tswv yim tsim yog muab tshwj xeeb rau oxidation, carburization, thiab sulfidation ntawm qhov kub thiab txias.
Cov ntsiab lus tseem ceeb: Sib npaug ntawm cov nickel (35%), Chromium (19%), thiab hlau (44%). Cov ntsiab lus siab nickel muab kev tiv thaiv rau carburization thiab thermal cycling, thaum chromium muab oxidation tsis kam.
Tus Kheej: Tus "High-Tus Kws Tshaj Lij Kub Kub."
25-6HN (UNS S30600): Feem ntau hu ua "Stainless Steel 25-6HN," qhov no yog high-silicon austenitic stainless hlau. Nws lub tswv yim tsim yog los muab kev tiv thaiv zoo rau kub, concentrated nitric acid (HNO₃).
Cov ntsiab lus tseem ceeb: High Chromium (20%), siab nickel (6%), thiab cov ntsiab lus tseem ceeb ntawm Silicon (3.7-4.3%). Silicon txhim kho qhov tsim ntawm kev tiv thaiv silica-nplua nuj zaj duab xis nyob rau hauv oxidizing acids.
Lub Npe: Tus "Nitric Acid Specialist."
2. Nyob rau hauv ib lub raj radiant los yog lub qhov cub kho cua sov, vim li cas Incoloy 330 yeeb nkab yog qhov kev xaiv zoo tshaj?
Incoloy 330 yog cov khoom siv rau cov khoom siv no vim tias nws tiv taus qhov "trifecta" ntawm kev puas tsuaj rau cov cua sov: huab cua kub, kev ua haujlwm cyclic, thiab huab cua hnyav.
Oxidation Resistance: 19% chromium cov ntsiab lus tsim ib qho chaw ruaj khov, adherent chromium oxide (Cr₂O₃) nplai uas tiv thaiv lub hauv paus hlau los ntawm kev scaling ceev thiab degradation ntawm kub txog 1150℃(2100℃F).
Carburization Resistance: 35% cov ntsiab lus npib tsib xee ua los tiv thaiv cov pa roj carbon ingress. Hauv cov huab cua carburizing (nplua nuj hauv CO), cov pa roj carbon tsis tuaj yeem nkag mus rau hauv siab -nickel matrix, tiv thaiv cov embrittlement thiab o uas yuav tshwm sim hauv qis dua -nickel alloys.
Thermal Stability & Strength: Nws tuav lub zog zoo thiab, qhov tseem ceeb, tiv thaiv kev tsim ntawm nkig sigma theem thaum lub sij hawm ntev - raug rau qhov kub thiab txias. Qhov no ua kom cov khoom tivthaiv tsis ua nkig thiab tawg thaum lub caij thermal cycling.
Cov yeeb nkab lossis retort ua los ntawm Incoloy 330 yuav muab ntau xyoo kev pab cuam txhim khu kev qha nyob rau hauv qhov kev rau txim no, outlasting feem ntau lwm yam alloys.
3. For a pipe handling >95% concentrated nitric acid ntawm qhov kub thiab txias, vim li cas 25-6HN yuav tsum tau teev dhau tus qauv 304L stainless hlau?
Qhov kev ua tau zoo sib txawv hauv kub, concentrated nitric acid yog qhov ua tau zoo thiab yog qhov tshwm sim ncaj qha ntawm cov ntsiab lus silicon siab hauv 25-6HN.
Qhov tsis ua tiav ntawm 304L: Thaum 304L muaj kev tiv thaiv zoo rau nitric acid ntawm qis qis thiab qhov kub thiab txias, nws tus nqi corrosion ua tsis txaus siab nyob rau hauv kub, concentrated acid (xws li, siab dua ~ 80% concentration ntawm boiling point). Nws raug kev txom nyem los ntawm "intergranular corrosion" thiab siab dav dav.
Superiority ntawm 25-6HN:
Silicon lub luag haujlwm: 3.7-4.3% silicon cov ntsiab lus yog qhov tseem ceeb. Nws txhawb kev tsim cov txheej txheem nyuaj, ruaj khov heev, thiab tiv thaiv cov yeeb yaj kiab uas muaj nplua nuj nyob hauv silicon oxide (SiO₂) hauv qab cov txheej txheem chromium oxide thawj. Qhov no silica-nplua nuj zaj duab xis yog tshwj xeeb resistant rau dissolution nyob rau hauv concentrated oxidizing acids.
Pov Thawj Kev Ua Haujlwm: Nws yog cov khoom siv ntawm kev tsim kho rau cov kav dej, tso tsheb hlau luam, thiab cov khoom siv hluav taws xob hauv cov nroj tsuag nitric acid (piv txwv li, hauv 浓缩 (concentration) seem ntawm cov txheej txheem).
Kev qhia txog 25-6HN yeeb nkab rau qhov kev pabcuam no tsis yog- sib tham tau los ua kom muaj kev ncaj ncees mus ntev thiab tiv thaiv tus nqi xau thiab kev kaw tsis tau npaj tseg.
4. Cov txheej txheem tsim thiab vuam sib txawv li cas rau ob lub alloys?
Cov txheej txheem sib txawv vim lawv qhov sib txawv thiab microstructures.
Vuam Incoloy 330:
Kev Sib Tw: Ua kom siab - qhov kub thiab txias thiab tsis txhob tawg kub.
Filler Hlau: Siv cov khoom siv tag nrho xws li ERNiCr-3 (Inconel 82) lossis 330-hom muab tub lim. Qhov no ua kom cov hlau vuam muaj chromium thiab npib tsib xee txaus kom phim lub hauv paus hlau oxidation thiab carburization kuj.
Cov txheej txheem: Siv cov khoom siv hluav taws xob tsawg thiab cov hlaws dai kom txo qis kev sib cais thiab cov qoob loo loj hlob hauv tshav kub- thaj chaw cuam tshuam (HAZ).
Vuam 25-6HN:
Kev Sib Tw: Cov ntsiab lus ntawm silicon siab ua rau cov dej ntws ntawm lub pas dej ua ke, tab sis kuj ua rau muaj kev pheej hmoo ntawm kev sib tsoo thiab tuaj yeem ua rau muaj cov silicides nkig.
Filler Hlau: Tsis muaj qhov sib txuam zoo meej. Ib qho kev xyaum yog siv lub zuag qhia tag nrho ntawm npib tsib xee-raws li cov khoom siv xws li ERNiCrMo-3 (Alloy 625). Qhov no muab cov kab nrib pleb-resistant weld nrog zoo heev corrosion kuj, txawm hais tias nws tsim ib qho sib txawv weld sib koom ua ke.
Cov txheej txheem: Kev tswj hwm huab cua kub yog xav tau. Pre-Kev tswj qhov kub thiab txias interpass feem ntau yog siv los tswj kev tawg yooj yim.
5. Hauv kev txheeb xyuas tus nqi ntawm lub neej rau cov nroj tsuag tshuaj, xaiv cov yeeb nkab hlau zoo li cas (330 vs. 25-6HN) cuam tshuam tag nrho cov nqi ntawm cov tswv?
Qhov kev ncaj ncees yog qhov tseeb: xaiv qhov tsis ncaj ncees lawm alloy lav qhov ua tsis tiav ntxov, ua rau cov khoom siv thawj zaug tsis cuam tshuam.
Tus nqi ntawm kev siv cov hlau tsis raug:
Siv 304L lossis txawm 310S nyob rau hauv kub, concentrated nitric acid yuav ua rau corrosion sai, yeeb nkab tsis ua hauj lwm, thiab cov nroj tsuag kaw nyob rau hauv ib lub hlis los yog lub lis piam.
Siv tus qauv stainless hlau zoo li 309 nyob rau hauv lub qhov cub carburizing yuav ua rau embrittlement thiab tsis ua hauj lwm hauv ib lub voj voog ntau lawm.
Tus nqi ntawm ib qho kev kaw tsis tau npaj tseg, kho thaum muaj xwm txheej ceev, thiab kev tsim khoom ploj tuaj yeem yog ntau lab daus las.
Tus nqi Proposition ntawm qhov raug Alloy:
Incoloy 330 Yeeb Nkab: Rau kev siv lub tshuab hluav taws xob, nws tus nqi yog ncua kev pab cuam lub neej thiab ua kom ntev tshaj plaws. Lub muffle uas kav ntev li 5 xyoos es tsis txhob 1 tshem tawm plaub qhov kev hloov pauv raug nqi.
25-6HN Yeeb Nkab: Rau kev pabcuam nitric acid, nws tus nqi yog qhov kev ntseeg tau. Nws ua kom cov kav dej kav ntev rau lub xyoo uas tau npaj tseg - lub neej ntev ntawm cov nroj tsuag yam tsis muaj kev cuam tshuam txog corrosion.
Xaus: Tus nqi them nqi ntawm cov yeeb nkab tshwj xeeb alloy zoo li Incoloy 330 lossis 25-6HN yog cov khoom siv tau zoo tshaj plaws ntawm tag nrho cov kab ke. Nws yog txoj cai tuav pov hwm tiv thaiv kev ua haujlwm tsis zoo. Kev txheeb xyuas tus nqi lifecycle overwhelmingly nyiam lawv cov kev xaiv rau qhov tshwj xeeb, ib puag ncig hnyav uas lawv tau tsim los ua tus tswv.
