Dab tsi yog qhov tseem ceeb tshuaj lom neeg tshuaj lom neeg ntawm Astm A333 gr.3 steel yeeb nkab?
ATTM A333 GR.3 yog cov npib tsib xee hlau. Nws cov khoom siv tseem ceeb siv cov pa roj carbon (c), mannese (mn), phosphorus (p), si), thiab tseem ceeb tshaj plaws (NIKEL (NI). Lub tsib xee cov ntsiab lus feem ntau yog li 3.18% rau 3.82%, uas yog cov tseem ceeb uas imm-{6}} kub. Lwm cov ntsiab lus, xws li cov carbon, khaws cia rau qib qis (tsawg dua lossis sib npaug rau 0.19%) kom tswj tau zoo weldabilabe thiab nruj. Qhov no precise tshuaj tshuav nyiaj kom ntseeg tau cov khoom uas ntseeg tau rau hauv ib puag ncig txias heev. Yog li, tshuaj muaj tshuaj lom neeg yog qhov tseem ceeb rau kev ua raws li cov cai ntawm Astm A333 tus qauv.
Dab tsi yog qhov tshwj xeeb cov khoom siv cov khoom siv ntawm Astm A333 gr.3 steel yeeb nkab?
Cov khoom siv cov khoom siv neeg kho mob yog tsim los kom ntseeg tau tias muaj kev nyab xeeb ntawm kev kub ntxhov. Nws chav tsev kub tensile cov kev tseev kom muaj tsawg kawg 450 MPa thiab nws cov txiaj ntsig ib lub zog yam tsawg kawg 240 MPA, muab lub hauv paus ntawm lub zog. Ntau qhov tseem ceeb yog nws qhov tshwj xeeb cuam tshuam cov tawv. The standard requires that the average of three specimens tested in a Charpy V-notch impact test at an extremely low temperature of -101℃(-150℃F) must be no less than 18 J (13 ft-lbf). Qhov kev nruj kev siab no yog qhov muaj txiaj ntsig zoo rau nws txoj kev tsis kam mus rau tsawg-kub brittle tawg. Yog li ntawd, cov tub ntxhais ntawm nws cov khoom siv neeg nyob hauv qhov zoo tshaj plaws ua ke ntawm lub zog thiab tawv.
Vim li cas thiaj yog npib tsib xee (ni) yog li tseem ceeb rau A333 Gr.3?
Nickel yog ib qho ntawm cov ntsiab tseem ceeb tshaj plaws rau kev txhim kho qhov qis - kub tawv ntawm cov hlau. Nws ntxiv hloov kho cov qauv siv lead ua thiab qis dua nws cov khoom siv kom sov (DBTT), cia cov khoom siv kub (DBTT) Hauv A333 Gr.3, ib cov ntsiab lus npib tsib xee ntawm kwv yees li ntawm 3.5% ua kom muaj kev sib tw ntawm Austenite, ua kom tiv thaiv tau zoo rau kev pib ua haujlwm thiab kev hais tawm ntawm qhov kub tsawg. Tsis muaj Nickel txaus, cov hlau yuav tsis tau raws li tus qauv tus qauv uas yuav tsum tau {}} 101 kev cuam tshuam lub zog muaj nqi. Yog li ntawd, npib tsib xee yog lub ntsiab lus tseem ceeb uas txiav txim nws qhov kev pab kub-kub tsawg.
Dab tsi yog qhov sib txawv ntawm A3333 Gr.3 thiab lwm yam qis qis {2} pa yeeb nkab qib, xws li Gr.6?
Thawj qhov sib txawv tseem ceeb hauv cov txheej txheem alloy thiab cov ntsuas kub tau ntau. A333 Gr.6 yog cov pa roj carbon {{{} manganese steel uas tsis muaj npib tsib. Nws qhov kev tsim tawm yam tsawg kawg nkaus yog kwv yees -45 degree, thiab nws txoj kev nruj ua tiav tau los ntawm kev kho kom nruj thiab kev kho cua sov. Gra3, ntawm qhov tod tes, yog ib qho quav hlau nplaum muaj kwv yees li 3.5% npib tsib xee. Nws qhov kev tsim tawm yam tsawg kawg tuaj yeem mus txog -101 degree, thiab nws cov kev ua tau zoo tshaj li ntawm Gr.6. Txawm li cas los xij, vim muaj kev suav nrog cov khoom siv hlau uas muaj nqis rau cov kab uas muaj nqis, Gr.3 feem ntau kim dua li Gr.6. Yog li ntawd, kev xaiv yog nyob ntawm qhov tsim tshwj xeeb thiab kev xav txog kev lag luam.
Dab tsi yog cov txheej txheem tsim khoom rau astm A333 gr.3 steel yeeb nkab?
Cov yeeb nkab no feem ntau yog tsim los siv cov txheej txheem seamless lossis welded. Seamless cov yeeb nkab yog tsim los ntawm tho ib puag ncig billet thiab tom qab ntawd dov lossis kos nws. Nws tsis muaj welds thiab muaj cov khoom hnav ris tsho thoob plaws. Welded yeeb nkab yog ua los ntawm coiling hlau daim hlau lossis strips thiab vuam lawv siv cov hau kev xws li submerged arc vuam (pom). Lub cheeb tsam Weld undergese strigorous strigororive kev sim siab thiab kev kho cua sov kom ntseeg tau tias nws cov khoom siv niam txiv. Tsis hais txog ntawm cov txheej txheem, qhov kawg steel yeeb nkab yuav tsum tau ua ib txwm li kho cua sov thiab homogenize tus qauv qis - kub cuam tshuam todlight.
