1. Yuav ua li cas xaiv cov kav hlau alloy steel nyob rau hauv cov chaw kub heev (xws li LNG cia tso tsheb hlau luam)? Cov kev xav tau tshwj xeeb yog dab tsi?
Cov khoom siv raug: Austenitic stainless hlau (xws li 304L, 316L, alloys uas yog tus 9% npib tsib xee yog xaiv tau zoo ntawm cov khoom siv kub tsawg.
Tseem Ceeb:
Tsis tshua muaj qhov kub cuam tshuam nyuaj: Yuav tsum tau dhau -196 degree charpy cuam tshuam kom tiv thaiv tau loj tawg.
Weldability: siv Ultra-Low Sulphur thiab phosphorus cov ntsiab lus steel nrog enicrmo tshwj xeeb enicrmo {1}}).
Cov Qauv Siv: ASTM A333 (Seamless Steel Yeeb Nkab rau Tsawg Kub), Astm A312 (Stainless Hlau Yeeb).
2. Dab tsi yog qhov ua rau muaj kev ntxhov siab corrosion cracking (SCC) hauv Alloy Steel Kave hlau? Yuav ua li cas tiv thaiv nws?
Ua rau:
Ib puag ncig: chloride ions (cl ill), hydrogen sulfide (h₂s) lossis kub alkali daws.
Kev ntxhov siab: residual kev ntxhov siab (xws li tom qab vuam) lossis ua haujlwm thauj.
Cov khoom siv rhiab: Austenitic stainless hlau (xws li 304) yog nquag rau scc hauv thaj chaw hauv av.
Kev tiv thaiv kev ntsuas:
Xaiv cov khoom siv: Siv Duplex Stainless Hlau (xws li 2205) lossis qis carbon stainless hlau (316L).
Txheej Txheem: Post-Weld kev ntxhov siab kom kho kub (xws li annealing).
Kev tiv thaiv: txheej lossis tshuaj tiv thaiv Cathodic.
3. Dab tsi yog "nkag tsis ua hauj lwm" ntawm alloy steel kav? Uas kev lag luam yuav tsum tsom mus rau?
Definition: The phenomenon that the steel pipe slowly deforms plastically until it breaks under high temperature (>400 degree) thiab kev ntxhov siab tas mus li.
Kev lag luam muaj kev pheej hmoo siab:
Thermal fais fab nroj tsuag (boiler Superheater leeg, cov ntaub ntawv xws li P92).
Petrochemicals (Nruas tawg rauv yas, cov ntaub ntawv xws li HP40).
Kev Txhim Kho Kev Txhim Kho:
Siv cov hlau hluav taws xob siab-molybdenum hlau (xws li P91 \/ P92) lossis ntxiv Niobium (NB) thiab Vanadium (V) los txhim kho creepge.
Nquag xyuas cov phab ntsa tuab txo tus nqi txo thiab ntaus cim ntawm cov tsev kawm ntawv uas muaj kev sib sau ua ntej carbide).
4. Dab tsi yog lub luag haujlwm ntawm sab hauv phab ntsa txheej (xws li yas hauv ob sab phlu, plating) ntawm alloy steel kav? Yuav ua li cas xaiv hom txheej?
Lub luag haujlwm:
Anti-corrosion: colate corrosive tawm (xws li acid, seawater).
Hnav Yaus: Txo cov hnav cov yeeb nkab phab ntsa los ntawm cov xov xwm granular (xws li slurry).
Kev nyiam huv: Cov khoom noj khoom haus txheej txheem (xws li epoxy cob) kom tsis txhob muaj kuab paug.
Hom txheej txheej:
Yas Lining (PE \/ PTFE): acid thiab alkali resistant, siv rau cov kav dej chemical.
Kub-DIP Galvanizing: anti-atmospheric corrosion, tus nqi qis tab sis tsis tiv taus qhov kub.
Tej hub txheej: ultra-siab hnav cov tshuaj tiv thaiv, siv rau kev thauj mus los hauv thee thiab cov kav dej.
5. Muaj peev xwm txuas ntxiv (3D luam ntawv) siv tshuab thev naus laus zis siv rau ntawm cov kav hlau alloy steel? Cov ntawv thov tam sim no yog dab tsi?
Ua tau:
Cov txiaj ntsig: tuaj yeem tsim cov txheej txheem nyuaj (xws li cov qauv tshwj xeeb ntawm cov duab tshwj xeeb zoo nkauj) thiab kho kom sai.
Cov kev txwv: Cov nqi tsim loj, cov khoom tsim khoom loj yog tsis yog ua kom paub tab yog cov txheej txheem ib txwm muaj.
Daim Ntawv Thov Khoom Siv:
Aerospace: Luam Ntawv Npib-Raws Li Alloy (Inconel 718) Roj Kav.
Lub zog nuclear: Laser Cladding los kho corrosion los kho corrosion ntawm sab hauv phab ntsa ntawm cov kav dej generator ntawm cov kav dej generator hauv chav.
Kev Tshawb Nrhiav: Kev loj hlob ntawm cov hmoov hlau tshwj xeeb (xws li cov hlau maraging).
