Cov neeg feem ntau xav li ntawdlub valventawm stainless hlau thiab yuav tsis xeb. Yog tias ua tau, nws yuav muaj teeb meem nrog cov hlau. Qhov no yog ib qho kev xav tsis zoo txog kev tsis nkag siab ntawm cov hlau tsis muaj steel, uas tuaj yeem xeb nyob rau hauv qee yam kev mob.
Stainless hlau muaj peev xwm tiv taus atmospheric oxidation—uas yog, xeb kuj, thiab kuj muaj peev xwm corrode nyob rau hauv xov xwm uas muaj acids, alkalis, thiab ntsev.—uas yog, corrosion kuj. Txawm li cas los xij, qhov loj ntawm nws lub peev xwm los tiv thaiv corrosion yog hloov nrog cov tshuaj muaj pes tsawg leeg ntawm nws cov hlau nws tus kheej, lub xeev ntawm kev tiv thaiv, kev siv thiab hom kev tshaj tawm ib puag ncig.
Stainless hlau feem ntau muab faib ua:
Feem ntau, raws li cov qauv metallographic, zoo tib yam stainless hlau tau muab faib ua peb pawg: austenitic stainless hlau, ferritic stainless hlau, thiab martensitic stainless hlau. Raws li lub hauv paus ntawm peb qhov yooj yim metallographic qauv, rau cov kev xav tau tshwj xeeb thiab lub hom phiaj, ob-theem steels, nag lossis daus-hardening stainless hlau thiab high-alloy steels nrog cov ntsiab lus hlau tsawg dua 50% tau muab los.
1. Austenitic stainless hlau.
Lub matrix yog dominated los ntawm austenite qauv (CY theem) ntawm lub ntsej muag-centered cubic siv lead ua qauv, uas tsis yog-sib nqus, thiab feem ntau yog ntxiv dag zog rau kev ua hauj lwm txias (thiab tej zaum yuav ua rau tej yam hlau nplaum) stainless hlau. Lub koom haum American Hlau thiab Hlau yog tsim los ntawm cov lej hauv 200 thiab 300 series, xws li 304.
2. Ferritic stainless hlau.
Lub matrix yog yog dominated los ntawm cov qauv ferrite ((ib theem) ntawm lub cev-centered cubic crystal qauv, uas yog sib nqus thiab feem ntau tsis tuaj yeem hardened los ntawm kev kho cua sov, tab sis tuaj yeem ua kom muaj zog me ntsis los ntawm kev ua haujlwm txias. Lub koom haum American Iron thiab Steel yog cim nrog 430 thiab 446.
3. Martensitic stainless hlau.
Lub matrix yog cov qauv martensitic (lub cev-centered cubic lossis cubic), sib nqus, thiab nws cov khoom siv kho tshuab tuaj yeem hloov kho los ntawm kev kho cua sov. Lub koom haum American Iron thiab Steel yog tsim los ntawm cov lej 410, 420 thiab 440. Martensite muaj cov qauv austenite ntawm qhov kub thiab txias, thiab thaum txias rau chav sov ntawm tus nqi tsim nyog, cov qauv austenite tuaj yeem hloov mus rau hauv martensite (ie, hardened) .
4. Austenitic-ferritic (duplex) stainless hlau.
Lub matrix muaj ob qho tib si austenite thiab ferrite ob-theem qauv, thiab cov ntsiab lus ntawm tsawg-theem matrix feem ntau ntau dua 15%. Nws yog hlau nplaum thiab tuaj yeem ua kom muaj zog los ntawm kev ua haujlwm txias. 329 yog ib hom duplex stainless hlau. Piv nrog rau austenitic stainless hlau, dual-theem steel muaj lub zog siab, thiab kev tiv thaiv rau intergranular corrosion thiab chloride kev nyuaj siab corrosion thiab pitting corrosion yog ho txhim kho.
5. nag lossis daus hardening stainless hlau.
Lub matrix yog austenite lossis martensitic qauv thiab tuaj yeem ua kom tawv los ntawm nag lossis daus hardening. Lub koom haum American Hlau thiab Hlau yog cim nrog 600 series tooj, xws li 630, uas yog 17-4PH.
Feem ntau hais lus, ntxiv rau cov alloys, qhov corrosion kuj ntawm austenitic stainless hlau kuj zoo heev. Nyob rau hauv ib puag ncig tsawg corrosive, ferritic stainless hlau tuaj yeem siv tau. Nyob rau hauv ib puag ncig corrosive me ntsis, yog tias cov khoom yuav tsum muaj siab Rau lub zog los yog siab hardness, martensitic stainless hlau thiab nag lossis daus hardening stainless hlau yuav siv tau.
Common stainless hlau qib thiab cov khoom
01 304 Stainless hlau
Nws yog ib qho ntawm feem ntau siv thiab dav siv austenitic stainless hlau. Nws yog qhov tsim nyog rau kev tsim cov khoom sib sib zog nqus thiab cov kua qaub, cov thawv ntim khoom, cov khoom siv, ntau yam ntsuas lub cev, thiab lwm yam. Nws tuaj yeem siv los tsim cov khoom siv tsis sib nqus, cov khoom siv kub thiab ib feem.
02 304L Stainless hlau
Txhawm rau daws qhov teeb meem ntawm ultra-low carbon austenitic stainless hlau tsim vim nag lossis daus ntawm Cr23C6 ua rau muaj kev cuam tshuam loj heev ntawm 304 stainless hlau nyob rau hauv qee qhov xwm txheej, nws lub xeev sensitized intergranular corrosion kuj yog qhov zoo dua li ntawm 304 stainless hlau. Tsuas yog lub zog qis me ntsis, lwm yam khoom zoo ib yam li 321 stainless hlau. Nws yog tsuas yog siv rau cov khoom siv corrosion-resistant thiab cov khoom uas tsis tuaj yeem raug kho tom qab vuam, thiab tuaj yeem siv los tsim ntau lub cev ntsuas.
03 304H Stainless hlau
Cov ceg sab hauv ntawm 304 stainless hlau muaj cov pa roj carbon ntau ntawm 0.04% -0.10%, thiab nws qhov kub thiab txias ua haujlwm zoo dua li ntawm 304 stainless hlau.
04 316 Stainless hlau
Ntxiv molybdenum rau lub hauv paus ntawm 10Cr18Ni12 steel ua rau cov hlau muaj kev tiv thaiv zoo los txo qhov nruab nrab thiab pitting corrosion. Hauv dej hiav txwv thiab lwm yam xov xwm, qhov kev tiv thaiv corrosion zoo dua li 304 stainless hlau, feem ntau yog siv rau pitting-resistant cov ntaub ntawv.
05 316L Stainless hlau
Ultra-tsawg carbon steel muaj qhov ua tau zoo rau kev nkag siab ntawm intergranular corrosion thiab tsim nyog rau kev tsim cov khoom siv welded thiab cov khoom siv nrog tuab ntu qhov ntev, xws li cov khoom siv tiv thaiv corrosion hauv cov khoom siv petrochemical.
06 316H Stainless hlau
Cov ceg sab hauv ntawm 316 stainless hlau muaj cov pa roj carbon ntau ntawm 0.04% -0.10%, thiab nws qhov kub siab ua haujlwm zoo dua li ntawm 316 stainless hlau.
07 317 Stainless hlau
Lub pitting corrosion kuj thiab creep kuj zoo dua 316L stainless hlau, uas yog siv nyob rau hauv kev tsim cov petrochemical thiab organic acid corrosion resistant khoom.
08 321 Stainless hlau
Titanium-stabilized austenitic stainless hlau, ntxiv titanium los txhim kho intergranular corrosion kuj, thiab muaj zoo kub-kub txhua yam khoom, tuaj yeem hloov tau los ntawm ultra-low carbon austenitic stainless hlau. Tsuas yog rau lub sijhawm tshwj xeeb xws li kub siab lossis hydrogen corrosion kuj, feem ntau tsis pom zoo siv.
09 347 Stainless hlau
Niobium-stabilized austenitic stainless hlau, ntxiv niobium los txhim kho intergranular corrosion kuj, corrosion kuj nyob rau hauv acid, alkali, ntsev thiab lwm yam corrosive media yog tib yam li 321 stainless hlau, zoo welding kev kawm, yuav siv tau raws li corrosion-resistant khoom thiab anti. -corrosion Kub hlau yog tsuas yog siv nyob rau hauv thermal hwj chim thiab petrochemical teb, xws li ua ntim, kav, tshav kub exchangers, shafts, furnace tubes nyob rau hauv industrial furnaces, thiab rauv tube thermometers.
10904L Stainless hlau
Super tiav austenitic stainless hlau yog ib hom super austenitic stainless hlau tsim los ntawm OUTOKUMPU hauv Finland. , Nws muaj qhov zoo corrosion kuj nyob rau hauv non-oxidizing acids xws li sulfuric acid, acetic acid, formic acid thiab phosphoric acid, thiab kuj muaj zoo tsis kam mus crevice corrosion thiab kev nyuaj siab corrosion kuj. Nws yog haum rau ntau yam ntawm sulfuric acid hauv qab 70°C, thiab muaj corrosion kuj zoo nyob rau hauv acetic acid thiab sib tov acid ntawm formic acid thiab acetic acid ntawm tej concentration thiab kub nyob rau hauv ib txwm siab.
11 440C stainless hlau
Martensitic stainless hlau muaj qhov nyuaj tshaj plaws ntawm cov hlau tsis muaj zog thiab cov hlau tsis muaj steel, nrog rau hardness ntawm HRC57. Feem ntau yog siv los ua nozzles, bearings,npauj npaimvalve cores,npauj npaimvalve rooj, tes tsho,valve stems, lwm.
12 17-4PH stainless hlau
Martensitic nag lossis daus hardening stainless hlau nrog hardness ntawm HRC44 muaj lub zog siab, hardness thiab corrosion kuj thiab tsis tuaj yeem siv ntawm qhov kub siab tshaj 300°C. Nws muaj corrosion kuj zoo rau cov cua thiab diluted acid los yog ntsev. Nws cov corrosion kuj yog tib yam li ntawm 304 stainless hlau thiab 430 stainless hlau. Nws yog siv los tsim offshore platforms, turbine hniav,npauj npaimvalve (valve cores, valve rooj, tes tsho, valve stems) wib ait.
In valve tsim thiab xaiv, ntau lub tshuab, series, thiab qib ntawm stainless hlau feem ntau ntsib. Thaum xaiv, qhov teeb meem yuav tsum tau txiav txim siab los ntawm ntau qhov kev pom xws li cov txheej txheem tshwj xeeb nruab nrab, qhov kub thiab txias, qhov siab, qhov nyuaj siab, corrosion, thiab nqi.
Post lub sij hawm: Lub Xya hli ntuj-20-2022
