ASTM A691 yog dab tsi?
A691 steel yeeb nkab yog ib hom alloy steel yeeb nkab tsim raws li ASTM cov qauv.Ntawm no yog cov lus piav qhia ntxaws txog A691 steel yeeb nkab:
Standards thiab Applications: A691 yog ib qho hluav taws xob -fusion-welded yeeb nkab raws li Asmeskas tus qauv, ua raws li ASTM A691. Nws yog qhov tsim nyog rau cov kav dej hauv siab - qhov kub thiab siab - qhov chaw siab, xws li cov chaw tsim hluav taws xob thiab cov nroj tsuag tshuaj, rau kev thauj mus los ntawm cov dej.
Khoom siv thiab khoom: Nws feem ntau yog ua los ntawm Cr-Mo (chromium-} molybdenum) alloy steel, uas tso cai rau cov yeeb nkab steel nrog zoo heev - kub lub zog, corrosion tsis kam, thiab hnav tsis kam, ua rau nws muaj kev ruaj khov nyob rau hauv kev ua haujlwm hnyav.
Kev tsim khoom: Cov txheej txheem tsim khoom ntawm A691 steel yeeb nkab suav nrog ntau cov kauj ruam tseem ceeb, xws li steelmaking, nruam casting, dov, thiab kev kho cua sov, kom ntseeg tau tias cov microstructure thiab cov khoom ntawm cov yeeb nkab steel ua tau raws li tus qauv thiab cov kev xav tau ntawm ntau yam kev thov.
Daim Ntawv Thov Scope: Vim nws txoj kev ua tau zoo heev, A691 steel yeeb nkab yog dav siv nyob rau hauv lub sij hawm uas yuav tsum tau siab - kub thiab siab - siab tsis kam, xws li roj av refining, tshuaj ntau lawm, thiab lub hwj chim kev lag luam.
Kev xav tau tshuaj ntawm SA691 Welded Piping
Mechanical Requirement ntawm ASTM A691 Steel Pipe
Kev tsim cov txheej txheem ntawm ASTM A691 Steel Pipes
Steelmaking: Ua ntej, raw cov ntaub ntawv xws li hlau ore, seem hlau, thiab alloys yog smelted nyob rau hauv ib tug steelmaking rauv los tsim molten hlau uas ua tau raws li cov tshuaj muaj pes tsawg leeg yuav tsum tau. Thaum lub sij hawm tus txheej txheem no, cov ntsiab lus ntawm cov ntsiab lus xws li carbon, chromium, thiab molybdenum yog precisely tswj los xyuas kom meej cov kev ua tau zoo ntawm cov hlau.
Nruam Casting: Lub molten hlau yog poured rau hauv ib tug nruam caster los tsim billets ntawm ib tug tshwj xeeb loj. Nruam casting pab txhim kho kev tsim khoom thiab ua kom lub cev sib xws ntawm cov qauv billet.
Yeeb Nkab Kev Npaj: Lub billet yog txiav mus rau qhov ntev uas yuav tsum tau ua thiab tom qab ntawd ua tiav rau hauv cov yeeb nkab tsis muaj qhov tsim nyog rau kev dov lossis kev ua haujlwm tom qab. Qhov no tej zaum yuav muaj cov txheej txheem xws li tho los yog extrusion los tsim ib lub hollow yeeb nkab dawb paug.
Rolling los yog forming: Cov yeeb nkab khoob yog dov los yog tsim siv cov yeeb nkab zeb kom ua tiav qhov xav tau sab nraud thiab phab ntsa tuab. Cov kauj ruam no yuav suav nrog ntau qhov kev sib tw ntawm dov thiab sizing kom paub meej qhov tseeb ntawm cov yeeb nkab steel.
Kev kho cua sov: Tom qab dov los yog tsim, cov yeeb nkab steel tau txais kev kho cua sov los kho nws cov microstructure thiab txhim kho nws cov khoom siv kho tshuab. Cov txheej txheem kev kho cua sov tshwj xeeb (xws li quenching thiab tempering) nyob ntawm qhov yuav tsum tau ua ntawm cov yeeb nkab steel.
Kev tshuaj xyuas thiab kuaj: Cov yeeb nkab steel ua tiav tau raug kuaj xyuas nruj thiab kuaj kom ntseeg tau tias nws ua tau raws li qhov yuav tsum tau muaj ntawm ASTM A691 thiab lwm yam qauv. Qhov no suav nrog tsis yog- kuaj kev puas tsuaj (xws li kuaj ultrasonic thiab kuaj hluav taws xob) txhawm rau txhawm rau kuaj pom qhov tsis xws luag, nrog rau kev ntsuas cov cuab yeej siv tshuab (xws li kev ntsuas tensile thiab kev ntsuas cuam tshuam).
Kev kho deg thiab ua tiav: Thaum kawg, cov yeeb nkab steel yuav raug kho saum npoo txheej txheem xws li txhaj tshuaj blasting lossis pleev xim los txhim kho nws cov corrosion kuj thiab zoo li. Nws yog tom qab ntawd txiav mus rau qhov xav tau ntev, cim, thiab ntim khoom xa tuaj.
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