Dab tsi yog lub thawj tshuaj lom neeg cov tshuaj lom neeg ntawm ASTM A333 Gr.9 cov yeeb nkab steel?
ATTM A333 GR.9 yog cov npib tsib xee hlau. Nws cov tub ntxhais tshuaj muaj pes tsawg leeg muaj kwv yees li 3.5% npib tsib (NI), lub ntsiab lus tseem ceeb rau nws qhov qis heev qis {4 4} kub nrawm. Nws tseem muaj cov khoom siv xws li cov pa roj carbon (c), manghologe (m), thiab lawv cov neeg mob hlwb, tab sis lawv cov lus qhia kom nruj kom ua kom cov khoom siv huv thiab ua tau zoo. Tus qauv tau nruj me ntsis sab saud thiab qis rau nws cov tshuaj lom neeg muaj pes tsawg leeg. Piv txwv li, phosphorus thiab leej faj, raws li detrimental ntsiab, yog tswj hwm mus rau qib qis tsawg los txo qhov txias tshaj plaws brittleness. Qhov kev ntsuas tshuaj sib npaug no yog lub hauv paus rau Gr.9 lub peev xwm los tswj kev tawv ntawm tsis kub heev. Nkag siab nws muaj pes tsawg leeg yog ib kauj ruam tseem ceeb hauv cov ntaub ntawv lees txais thiab kev tsim kev sib tsoo.
Dab tsi yog cov khoom ntiag tug tshwj xeeb rau Astm A333 Gr.9 cov yeeb nkab steel?
Cov cuab yeej siv ua ke cov cuab yeej yuav tsum muaj rau cov khoom no yog nws qhov cuam tshuam nyuaj ntawm tsawg kub. Tus qauv qhia tsis yog tsuas yog ua kom muaj zog xws li lub zog tensile thiab tawm los ntawm cov chaw kub, tab sis ntau qhov charpy v- notch cuam tshuam lub zog ntawm qee qhov kub tsawg. Piv txwv li, kev ntsuas kev cuam tshuam yuav tsum tau ua rau -100 ° C (-150 ° F) thiab ntsib tus nqi yuav tsum tau nqus muaj txiaj ntsig. Qhov kev ua tau zoo no ua kom ntseeg tau tias cov yeeb nkab muaj qhov muaj feem tsawg dua ntawm brittle bacture hauv ib puag ncig cryogenic. Nws cov yam ntxwv txhua yam yog tsim ib puag ncig ntawm lub hauv paus ntsiab lus ntawm kev ua ntej tohaductizing tawv, ntau dua li tsuas yog kev qhia lub zog.
Vim li cas thiaj yog npib tsib xee (ni) yog li tseem ceeb rau A333 Gr.9 cov yeeb nkab steel?
Nickel yog ib qho Austenite - Taug kev keeb. Nws ntxiv cov dualile - brre steel hloov (DBTT) ntawm cov khoom siv kub (DBTT) Hauv Gr.9, 3.5% ni cov ntsiab lus zoo kawg li micructure ntawm ferrite matrix, txhim kho nws txoj kev tawm tsam thiab kev tawm tsam ntawm qhov kub tsawg. Nickel tseem yaj nyob rau hauv Ferrite, ntxiv dag zog rau lub matrix yam tsis muaj kev cuam tshuam zoo. Qhov kev siv hluav taws xob alloy muaj qhov zoo tshaj plaws ua ke ntawm tus nqi zoo tshaj plaws ntawm tus nqi zoo tshaj plaws ntawm tus nqi zoo tshaj plaws ntawm tus nqi {8} ua tau zoo thiab kev xaiv siab zoo rau cryogenic applics.
Dab tsi yog qhov sib txawv ntawm A3333 Gr.9 thiab lwm qhov qis qis- dej sov stades, xws li Gr.6?
Thawj qhov sib txawv tseem ceeb hauv cov ntsiab lus alloy thiab cov ntsuas kub tau siv ntau. Gr.6 yog cov pa roj carbon hlau nrog tsuas yog ib qho me me ntawm alloy cov ntsiab lus, thiab nws qhov kev tsim tawm yam tsawg kawg nkaus yog kwv yees li {45 ° C. Gr.9, ntawm qhov tod tes, muaj 1,5% npib tsib xee, ua rau nws muaj qhov tsis tshua muaj cov hlau uas tsis muaj ntau ntxiv. Yog li ntawd, Gr.9 muaj cov nqi dua, kev tsim khoom, thiab vuam txheej txheem yuav tsum tau tshaj gr.6. Qhov kev xaiv ntawm Gr.9 thiab Gr.6 nyob ntawm cov phiaj xwm kev tsim kho qhov kub yuav tsum muaj, raws li ob qho tib si yog tsim nyog rau qib kev pabcuam cryogenic.
Dab tsi yog cov cim microstritural ntawm A333 Gr.9 Hlau Yeeb?
Tom qab ib txwm ua, cov microstructure ntawm A333 Gr.9 yog tus cwj pwm los ntawm ua kom zoo nkauj ferrite thiab Pearlite. Qhov sib ntxiv ntawm cov qoob loo loj, thiab cov tshuab ua kom zoo dua yog ib qho kev ua tau zoo tshaj plaws ntawm ib txhij kev txhim kho cov khoom siv lub zog thiab tawv. Qhov kev hnav ris tsho no, zoo microstructure tsim ntau cov teeb meem kom ua rau kev sib cav, uas yuav tsum tau txhais tau tias muaj qhov kub zoo dua qub. Qhov ruaj khov ntawm no microstructure yog qhov tseem ceeb rau ntev-} kev pabcuam qis {} kev ua haujlwm tsis txwv lub sijhawm.
