1. Sub-siab kub
Sub-high kub yog hais txog kev ua haujlwm kub ntawm lub valve hauv 325 ~ 425 degree ntau yam. Yog tias qhov nruab nrab yog dej thiab chav, WCB, WCC, A105, WC6 thiab WC9 feem ntau yog siv. Yog hais tias qhov nruab nrab yog sulfur-muaj roj, C5, CF8, CF3, CF8M thiab CF3M, uas yog resistant rau sulfide corrosion, feem ntau yog siv. Lawv feem ntau yog siv nyob rau hauv atmospheric thiab nqus tsev thiab ncua coking units nyob rau hauv refineries. Lub sijhawm no, li qub ua los ntawm CF8, CF8M, CF3 thiab CF3M tsis yog siv los tiv thaiv corrosion los ntawm cov kua qaub, tab sis yog siv rau cov khoom siv roj ntsha thiab cov roj thiab cov kav dej. Hauv qhov kev ua haujlwm no, qhov siab tshaj plaws ua haujlwm kub txwv ntawm CF8, CF8M, CF3 thiab CF3M yog 450 degree.
2. Kub kub theem I
Thaum qhov kub thiab txias ua haujlwm ntawm lub valve yog 425 txog 550 degree, nws yog qib siab kub I (hu ua PI qib). Lub cev khoom tseem ceeb ntawm PI qib valve yog "siab kub qib I nruab nrab carbon chromium nickel tsis tshua muaj ntiaj teb titanium zoo kub-resistant steel" raws li CF8 hauv ASTM A351 tus qauv. Vim tias qib PI yog lub npe tshwj xeeb, nws suav nrog lub tswv yim ntawm kev kub siab stainless hlau (P). Yog li, yog tias qhov nruab nrab ua haujlwm yog dej lossis chav dej, txawm hais tias qhov kub-kub steel WC6 (t Tsawg dua lossis sib npaug li 540 degree) lossis WC9 (t Tsawg dua lossis sib npaug li 570 degree) kuj tuaj yeem siv, txawm hais tias kub-kub steel C5 (ZG1Cr5Mo) kuj tseem siv tau thaum siv cov roj sulfur, tab sis nyob rau hauv Peb tsis tuaj yeem hu lawv PI qib ntawm no.
3. Kub kub theem II
Kev ua haujlwm kub ntawm lub valve yog 550 ~ 650 degree, uas tau raug xaiv raws li qhov kub thiab txias theem II (xa mus rau qib PII). PⅡ kub-kub li qub feem ntau yog siv rau hauv cov roj hnyav catalytic cracking units hauv refineries. Lawv suav nrog qhov kub-kub lined thiab hnav-resistant rooj vag li qub siv nyob rau hauv peb-roj nozzles thiab lwm yam. Cov khoom siv lub cev tseem ceeb ntawm PⅡ chav kawm valve yog "high temperature class II medium carbon chromium nickel rare earth titanium and tantalum reinforced heat-resistant steel" raws li CF8 hauv ASTM A351 tus qauv.
4. Kub kub theem III
Kev ua haujlwm kub ntawm lub valve yog 650 ~ 730 degree, uas tau raug xaiv los ua qhov kub siab III (xa mus rau qib PIII). PⅢ chav kawm kub kub li qub feem ntau yog siv hauv cov roj hnyav hnyav catalytic cracking units hauv refineries. Cov khoom siv lub cev tseem ceeb ntawm PⅢ qib siab kub valve yog "siab kub qib III nruab nrab carbon chromium nickel molybdenum tsis tshua muaj ntiaj teb titanium thiab tantalum reinforced heat-resistant steel" raws li CF8M hauv ASTM A351 tus qauv.
5. Kub kub theem IV
Kev ua haujlwm kub ntawm lub valve yog 730 ~ 816 degree, uas tau raug xaiv los ua qhov kub siab IV (xa mus rau qib PIV). Lub siab txwv ntawm kev khiav hauj lwm kub ntawm PIV chav kawm li qub yog 816 degree vim hais tias qhov siab tshaj plaws kub muab nyob rau hauv tus qauv ASMEB16134 siab-temperature chav kawm xaiv rau valve tsim yog 816 degree (1500υ). Tsis tas li ntawd, tom qab ua haujlwm kub siab tshaj 816 degree, cov hlau yog ze rau nkag mus rau qhov kub ntawm forging. Lub sijhawm no, cov hlau yog nyob rau hauv cov yas deformation ntau yam. Cov hlau muaj cov yas zoo thiab tsis tuaj yeem tiv taus kev ua haujlwm siab thiab cuam tshuam lub zog yam tsis muaj deforming. Cov khoom siv lub cev tseem ceeb ntawm PⅣ qib valve yog CF8M raws li "siab kub theem IV nruab nrab carbon chromium nickel molybdenum tsis tshua muaj ntiaj teb titanium thiab tantalum reinforced heat-resistant steel" hauv ASTM A351 tus qauv. Thaum tshav kub kub-resistant stainless hlau xws li F310 (nrog C cov ntsiab lus Ntau dua los yog sib npaug rau 01050%) thiab F310H hauv CK-20 thiab ASTM A182 tus qauv.
6. Kub kub theem V
Qhov ua haujlwm kub ntawm lub valve yog siab dua 816 degree, uas yog hu ua PⅤ qib. PⅤ qib siab-kub li qub (valve siv los ua cov txiav tawm li qub, tsis tswj cov npauj npaim li qub) yuav tsum tau txais kev tsim tshwj xeeb, xws li hauv ob sab phlu nrog thermal rwb thaiv tsev hauv ob sab phlu lossis dhau dej lossis roj. Txias, thiab lwm yam tuaj yeem ua kom lub cev ua haujlwm ntawm lub valve. Yog li ntawd, tsis muaj kev cai nyob rau sab sauv txwv ntawm kev khiav hauj lwm kub ntawm PⅤ-chav kawm high-temperature li qub. Qhov no yog vim tias kev tswj xyuas qhov kub thiab txias ntawm lub valve tsis yog txiav txim siab los ntawm cov khoom siv ib leeg, tab sis los ntawm kev tsim tshwj xeeb txhais tau tias, thiab cov ntsiab lus tseem ceeb ntawm cov qauv tsim yog tib yam. PⅤ chav kawm kub kub li qub tuaj yeem xaiv cov khoom tsim nyog uas tuaj yeem ua tau raws li qhov xav tau ntawm lub valve raws li nws qhov nruab nrab ua haujlwm thiab ua haujlwm siab thiab cov qauv tsim tshwj xeeb tau txais. Nyob rau hauv PⅤ chav kawm kub-kub li qub, feem ntau cov ntawv ntxig lossis daim hlau npauj npaim ntawm lub qhov rooj valve lossis npauj npaim li qub feem ntau yog ua los ntawm HK-30 thiab HK-40 high-temperature alloys hauv ASTMA297 tus qauv. Lawv tuaj yeem tiv taus oxidation thiab txo cov pa roj hauv qab 1150 degree. Resistant corrosion, tab sis tsis tuaj yeem tiv taus qhov cuam tshuam thiab siab loads.