Daim ntawv thov ntawm A387 Qib 5 Chav Kawm 1 yog dab tsi?
A387 Qib 5 Chav Kawm 1 yog ib qho tshwj xeeb, siab -chromium alloy steel phaj siv nyob rau hauv hnyav heev corrosive siab- qhov kub thiab txias ib puag ncig qhov twg oxidation, sulfidation, los yog lwm yam kev kub corrosion yog cov thawj tsim kev txhawj xeeb, es tsis yog kev kub siab xwb. Nws 5% chromium cov ntsiab lus txhais nws cov niche.
Cov ntawv thov tseem ceeb ntawm A387 Qib 5 Chav Kawm 1:
1.Petroleum Refining – Fluid Catalytic Cracking (FCC) Units:
Nov yog daim ntawv thov classic thiab tseem ceeb tshaj plaws. Nws yog siv rau cov khoom siv ncaj qha mus rau cov khoom siv hluav taws xob kub thiab cov pa roj cua (muaj cov sulfur) ntawm qhov kub ntawm ~ 650℃txog 900℃(1200℃F txog 1650℃F).
Cov Cheeb Tsam Tshwj Xeeb: FCC reactor cyclones, catalyst hloov kab, risers, thiab plenum chambers. Nws zoo heev tsis kam mus rau siab - kub sulfidation nres tiv thaiv phab ntsa sai sai hauv cov kev pabcuam abrasive thiab corrosive.
2.Chemical & Petrochemical ua:
Cov nkoj, reactors, los yog liners tuav siab -kub txheej txheem kwj uas muaj sulfur, hydrogen sulfide (H₂S), los yog lwm yam corrosive media.
Cov cuab yeej siv hauv cov nroj tsuag tsim cov tshuaj xws li carbon disulfide lossis hauv qee qhov kev hloov kho nrog cov mob hnyav.
3.Power Generation (Traditional Fossil Fuel):
Coal-Cov Hluav Taws Xob Hluav Taws Xob: Cov khoom sib xyaw ua rau siab - cov hmoov tshauv thiab cov pa roj cua corrosion, xws li qee qhov kev txhawb nqa superheater, phab ntsa vaj huam sib luag, lossis cov tshauv - tuav cov tshuab hauv cov qauv qub.
Cov khib nyiab-rau-Cov nroj tsuag hluav taws xob: Cov seem raug rau cov pa roj corrosive heev.
4.Industrial Cua sov & Thermal ua:
Radiant tubes, qhov cub hauv ob sab phlu, thiab cov khoom siv hluav taws xob sib hloov hauv ncaj qha - cov cua sov los yog cov hloov kho qhov twg hlau kub siab heev thiab cov cua yog oxidizing los yog sulfidizing.
Vim li cas thiaj xaiv Qib 5 Chav Kawm 1? Qhov laj thawj:
1.Superior Corrosion / Oxidation Resistance:The ~5% Chromium forms a dense, adherent oxide scale that resists breakdown in sulfur-containing and oxidizing atmospheres far better than lower chromium steels (Grades 11, 12, 22).
2.Tus nqi-Txoj kev xaiv zoo rau Stainless:Rau ntau ntawm cov ntawv thov no, nws muab cov kev daws teeb meem ntau dua li cov qib stainless hlau (xws li, 300 series) thaum muab lub zog txaus thiab zoo dua thermal qaug zog tiv thaiv hauv kev ua haujlwm cyclic.
3.Fabrication Path (Class 1):Muab nyob rau hauv cov xwm txheej zoo li qub, nws yog qhov tsim nyog rau cov khoom siv uas yuav ua tiav qhov kawg Post-Weld Heat Treatment (PWHT) los txhim kho qhov tawv thiab txo qhov kev ntxhov siab.
Cov kev txwv tseem ceeb & Cov ntsiab lus niaj hnub:
1.Lower Weldability & Toughness:Nws muaj qhov tsis zoo weldability piv rau qis- alloy steels, xav tau cov txheej txheem nruj heev (high preheat, tshwj xeeb muab tub lim, nruj PWHT). Nws qhov thais toughness kuj qis dua.
2.Tsis yog rau siab -Kev Pabcuam Hydrogen:Nws tsis yog siv rau siab - siab hydrogen hlab ntsha (xws li hydrocrackers); Qib 11, 22, lossis 91 raug xaiv rau lub hom phiaj ntawd vim lawv cov ntsiab lus molybdenum thiab microstructure stability.
3. Kev Hloov Ib Nrab los ntawm Newer Alloys:Hauv ntau cov qauv tsim niaj hnub no, tshwj xeeb tshaj yog nyob rau hauv lub zog tsim hluav taws xob, nws tau raug hloov pauv ntau los ntawm ASTM A387 Qib 91 (9Cr-}1Mo-V), uas muaj kev nkag siab zoo dua thiab ua haujlwm zoo oxidation. Stainless hlau cladding tshaj carbon steel kuj yog ib qho kev xaiv.
Hauv cov ntsiab lus
A387 Qib 5 Chav Kawm 1 yog cov khoom siv tshwj xeeb uas tau teev tseg rau nws qhov tshwj xeeb kub corrosion kuj nyob rau hauv tshwj xeeb, hnyav refinery (FCC) thiab siab -kub ua cov ntawv thov, qhov twg ib puag ncig dictates cov khoom xaiv tshaj lub siab ib leeg. Nws siv yuav tsum tau tshwj xeeb fabrication thiab vuam kev txawj ntse.
1. Dab tsi tshwj xeeb siab -kub corrosive ib puag ncig pom zoo siv A387 Qib 5 tshaj qis dua -chromium qib zoo li Qib 11 lossis 22?
Cov lus nug no yog tsom rau lub ntsiab lus tsim qauv, tshawb txog cov kev pabcuam niche -xws li sulfidation hnyav lossis oxidation hauv catalytic crackers- qhov twg nws 5% chromium cov ntsiab lus muab qhov tseem ceeb ntawm kev ua tau zoo txawm tias nws cov nqi siab dua thiab kev tsim khoom nyuaj.
2. Dab tsi yog qhov tseem ceeb ntawm kev sib tw vuam thiab cov txheej txheem tseem ceeb rau kev tsim khoom nrog A387 Qib 5 Chav Kawm 1?
Cov lus nug no hais txog cov teeb meem tseem ceeb, tsom mus rau qhov nruj preheating, kev sib cuam tshuam ntawm qhov kub thiab txias, thiab kev xaiv cov hlau tshwj xeeb uas yuav tsum tau ua vim yog cov hlau alloy siab hardenability thiab kev pheej hmoo ntawm qhov txias txias.
3. Vim li cas qhov kawg Post-Weld Heat Treatment (PWHT) rau Qib 5 Chav Kawm 1 tshwj xeeb yog qhov tseem ceeb, thiab yuav tsum tswj hwm qhov xwm txheej twg?
Cov lus nug no qhia txog qhov tseem ceeb ntawm kev tsim cov txheej txheem kawg, hais txog qhov xav tau kom muaj kev sib haum xeeb kom ua tiav qhov muaj zog txaus thiab kev ntxhov siab thaum tsis txhob muaj teeb meem xws li kev loj hlob ntau dhau los yog rov ua dua thaum txias.
4. Hauv cov ntawv thov twg A387 Qib 5 feem ntau tau hloov los ntawm lwm cov ntaub ntawv hauv kev tsim qauv niaj hnub no, thiab vim li cas?
Cov lus nug no tshawb txog cov kev hloov pauv ntawm cov khoom siv, sau tseg tias qib zoo li ASTM A387 Qib 91 (9Cr-1Mo-V) lossis stainless cladding tau hloov qib 5 hauv ntau qhov siab -kub ntsuas vim muaj zog zoo dua -toughness balance lossis nqi-zoo.
Tag nrho cov specification thiab cov ntsiab lus muaj nyob rau ntawm kev thov. Cov ntaub ntawv saum toj no yog muab rau kev taw qhia nkaus xwb. Rau kev tsim tshwj xeeb thov hu rau peb cov neeg ua haujlwm muag khoom.
