Muaj ob peb lub ntsiab lus sib txawv ntawm kev ci ntsa iab thiab unannealed stainless hlau seamless hlab. Cov kev sib txawv no feem ntau tshwm sim los ntawm qhov kev kawm annealing cuam tshuam rau cov khoom siv sab hauv thiab cov khoom. Hauv qab no yog qhov kev tawg siab heev ntawm cov kev sib txawv no:
I. Cov Khoom Siv Neeg Kho Tshuab
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Qhov taw qhia kev ua tau |
Ci Ntsej Muag |
Unannealed |
|
Kev nyuaj |
Txo Hardness (Softened tom qab annealing), feem ntau hv hardness txo ntawm 30% ~ 50%. |
Ntau dua hardness (realidual txias ua haujlwm plhuav tsis tshem tawm), nrog HV siab dua HV Hardness. |
|
Ductility (elongation) |
Ua tau zoo dua ductility, elongation tus nqi (A5) tuaj yeem ncav cuag 35% ~ 50% (nyob ntawm cov khoom). |
Qis dua, elongation tsuas yog 15% ~ 30%, thiab nquag rau embilllement tom qab ua haujlwm txias. |
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Kev muaj zog |
Zoo dua cov kev cuam tshuam nyuaj, tsawg heev rau nkig backstre. |
Lub cev tsis zoo, tshwj xeeb yog tom qab cov duab kos lossis txias dua, qhov twg kev ntxhov siab yuav tshwm sim. |
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Muaj zog |
Yooj yim rau kev khoov tom ntej, nplaim taws, vuam, thiab lwm yam, yam tsis tau tawg. |
Kev ua haujlwm txias tsis zoo; Yuam kev ua yuav ua rau tawg lossis tawg. |
Ii. Corrosion Kuj
1. Qaug annealed leeg
Lub corrosion tsis kam ntawm kev ci annealed stainless-steel leeg yog ho ua kom zoo dua vim muaj ob peb qhov tseem ceeb:
Nto Oxide Zaj Duab Xis Tsim
Thaum lub sij hawm annealing txheej txheem, tiv thaiv pa roj xws li hydrogen (h₂) thiab nitrogen (n₂) yog siv rau inhibit oxidation. Qhov no ua rau muaj kev tsim ntawm cov khaub ncaws hnav thiab tuab cov zaj duab xis passive passivation (crreo₃) nyob rau saum npoo. Lub siab nto tiav (ra tsawg dua lossis sib npaug ntawm 0. 8 μm) minimizes cov tshuaj nplaum ntawm cov xeb, muab kev tiv thaiv zoo rau kev tiv thaiv kev xeb.
Txo cov kev phom sij nruab nrab
Rau kev txhawb nqa cov hlau me me (piv txwv li, 304, 316L), txoj kev pheej hmoo ntawm kev sib txuam nrog kev txhawj xeeb yog qhov kev txhawj xeeb tseem ceeb. Thaum raug rau cov kev daws teeb meem kev daws teeb meem (tus txheej txheem cuam tshuam nrog cov cua txias kub ua raws li los ntawm cov chromium carbides (cr l lucc₆) ntawm cov ciaj ciam yog tiv thaiv. Qhov no ua kom pom tseeb tias cov ntsiab lus chromium seem uas tau faib thoob plaws cov khoom, tswj hwm nws cov xeb tsis kam.
Kev tshem tawm ntawm kev ntxhov siab corrosion cracking (SCC)
Ci annealing zoo tshem tawm cov kev ntxhov siab uas tshwm sim los ntawm cov txheej txheem txias. Los ntawm kev tshem tawm cov kev ntxhov siab no, qhov ntxim nyiam ntawm kev ntxhov siab corrosion (SCC) tau txo qis, tshwj xeeb hauv kev sib zog muaj chloride ions. Qhov no ua rau cov menyuam yaus ci ci ci hnyav rau cov ntawv thov uas ntev ntev thiab tiv taus rau cov mob corrosive yog qhov tseem ceeb.
2. Unannealed leeg
Lub corrosion tsis kam ntawm unannealed stainless hlau leeg yog feem ntau qis dua piv rau kev ci anealed leeg vim muaj ntau yam:
Nto qhov tsis xws:Tom qab ua haujlwm txias, saum npoo yuav khaws cov roj nplua nyeem, oxides, lossis cov micro-tawg, uas tuaj yeem ua cov ntsiab lus rau kev xeb.
Kev ntxhov siab ntxhov siab:Kev ua haujlwm ntawm kev ua haujlwm tsis zoo yuav ua kom nrawm dua qhov kev tawm tsam ntawm cov tub sab hauv, ua rau cov khoom siv tau rau kev xeb hauv cov acidic lossis dej hiav txwv.
III. Microstructure thiab cov qauv
1. Qaug annealed leeg
Lub microstructure thiab cov teeb meem ntawm ci annealed stainless hlau leeg yog optiming txheej txheem:
Grain qauv:Annealing ua rau cov nplej txias-ua haujlwm kom recrystallize, kev sib sau hnav zoo li hmoov nplej. Qhov no tshem tawm kev ntxhib los mos thiab leg, martensitic stainless hlau tuaj yeem hloov kho hauv Ferrite + PETLES tom qab annealing).
Residual kev ntxhov siab:Annealing ua tau zoo txo qis kev ntxhov siab tshwm sim los ntawm kev ua haujlwm txias (muaj kev ntxhov siab rau 50 MPA tsawg dua rau kev siv dag zog ntev.
2. Unannealed leeg
Nyob rau hauv kev sib piv, unannealed stainless hlau ib leeg khaws lawv cov microstre micrujtructure, uas muaj ntau yam cuam tshuam:
Txias ua haujlwm Microstructure:Lub microstructure khaws cov fibrous, elongated graph qauv vim kev ua haujlwm txias. Cov nplej yuav ncab lossis distorted (piv txwv li, Austenitic stainless hlau yuav tsim kev sib ntaus sib ceg tom qab kos duab txias). High-density dislocations yog tam sim no nyob rau hauv cov khoom siv.
Kev ntxhov siab lub xeev:Residual kev ntxhov siab yog ntau dua (txog li 200-300 MPa), uas tuaj yeem ua rau ncua kev tawg ntawm lub sijhawm kaw lossis siv.
V. Cov ntaub ntawv teev npe raug cai
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Daim Ntawv Thov Teb |
Ci Ntsej Muag |
Unannealed |
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Khoom Noj & Kws Tshuaj |
Cov kav dej qab zib, khoom siv tshuaj (tsim nyog corrosion tsis kam + siab huv). |
Cov qauv tsis tiv thaiv cov txheej txheem (piv txwv li, cov nkhaus, tshuab ntxhua khaub ncaws). |
|
Tshuaj & Cov Tubrog nkoj engineering |
Corrosive Qhov Nruab Nrab Nruab Nrab (piv txwv li, acids, alkalis, seawater). |
Cov kav dej ib ntus, cov tsis muaj siab-cov kab ke sib xyaw ua ke. |
|
Zog & Fais Fab |
Lub zog nuclear cog chav dej roj (yuav tsum muaj kev ntxhov siab corrosion tsis kam). |
Cov qauv hlau cov qauv, tsis yog qhov tseem ceeb tshaj tawm dej num hluav taws xob. |
|
Semiconductor |
Ultra-high-huv-phaog roj \/ kua tsheb thauj khoom (piv txwv li, qib hluav taws xob nitrogen, dej deionized dej). |
Cov qauv tsis muaj txiaj ntsig los yog tsis xaiv pipelines. |
Stainles Hlau Tube Zeb Ntau Lawm Kab
Xaus:
Ci annaling tseem ceeb ua rau lub ductility, kev ua kom nruj, thiab cov txheej txheem ntawm cov qauv kev ntxhov siab, ua kom haum qoob loo. Qhov no ua rau lawv haum ntau rau kev tsim khoom siab thiab chaw hnyav. Nyob rau hauv kev sib piv, unannealed cov leeg khaws lawv cov yam ntxwv txias-ua haujlwm thiab tsuas yog tsim nyog rau cov kev xav tau (piv txwv li cov neeg kho tshuab hluav taws xob lossis cov siv ib ntus). Thaum xaiv nruab nrab ntawm ob, nws yog qhov tseem ceeb kom txiav txim siab tshwj xeeb kev ua haujlwm, xws li nruab nrab corrosivity, siab, thiab tom qab ua.
