Hauv kev siv engineering ntawm cov ntaub ntawv steel,ASTM A516 GR 70thiab ASTM A36 yog ob feem ntau siv cov qib carbon steel. Ob leeg koom nrog American Society for Testing and Materials (ASTM) cov qauv txheej txheem, tab sis lawv muaj qhov sib txawv tseem ceeb hauv cov khoom muag, cov yam ntxwv ua tau zoo, thiab cov xwm txheej ntawm daim ntawv thov. Kab lus no tshawb txog lawv qhov sib txawv los pab koj xaiv cov hlau tsim nyog rau koj cov haujlwm.
Standard Positioning thiab Design Purpose
ASTM A36 yog ib qho dav dav - lub hom phiaj cov qauv carbon steel qauv tsim los ua kom tau raws li qhov yuav tsum tau muaj rau lub zog thiab kev sib txuas hauv kev tsim kho thiab cov qauv siv tshuab. Nws hais txog "versatility" thiab "npaj," ua rau nws haum rau tsis yog -siab- bearing Cheebtsam xws li kab teeb, kab, kab, platforms, thiab kev txhawb nqa.
ASTM A516 GR 70 nyob rau hauv ib qho tshwj xeeb niche. Nws lub npe tag nrho yog Carbon Steel Phaj rau Nruab Nrab thiab Tsawg -Tsuas Kub Siab Vessels. Nws lub hom phiaj tseem ceeb tsim yog kom tiv taus lub siab sab hauv thaum tswj kev ua haujlwm zoo heev, tshwj xeeb tshaj yog khaws cia cov pob txha txhim khu kev qha hauv qab - qhov kub thiab txias. Yog li ntawd, nws tuav qhov tseem ceeb hauv kev siv xws li cov hlab ntsha siab, boilers, thiab kub exchangers.
Qhov sib txawv ntawm cov tshuaj muaj pes tsawg leeg
Raws li ib qho dav dav - lub hom phiaj carbon structural steel, A36 muaj cov kev xav tau ntawm cov ntsiab lus: carbon cov ntsiab lus ≤0.26%, manganese cov ntsiab lus kwv yees li 1.03%. Kev txwv rau cov teeb meem tsis zoo xws li phosphorus thiab sulfur yog 0.04% thiab 0.05% feem. Nws tso cai rau kev kho qhov sib xyaw kom tau raws li cov cuab yeej siv tshuab yooj yim, ua ntej tus nqi -kev ua tau zoo thiab kev ua haujlwm.
A516 GR 70, raws li cov hlau tshwj xeeb rau nruab nrab - thiab qis - cov hlab ntsha kub siab, muaj cov yam ntxwv ntawm kev tswj xyuas nruj dua: cov ntsiab lus carbon tau raug tswj hwm ntawm 0.10% - 0.22% (hloov los ntawm tuab), thaum cov ntsiab lus manganese ruaj khov ntawm 0.85% - 1.20% tough. Phosphorus thiab sulfur txwv tau txo mus rau ≤0.035%. Aluminium yog ntxiv los ua kom cov qoob loo loj, thaum qee cov qib sib xyaw chromium thiab molybdenum los txhim kho corrosion kuj, txo qis - qhov kub thiab txias nkig puas ntawm qhov chaw.
Mechanical Properties Sib piv
Mechanical zog sawv cev qhov sib txawv tshaj plaws ntawm ob. A36 nthuav tawm qhov tsawg kawg nkaus lub zog ntawm 250 MPa (36 ksi) thiab lub zog tensile ntawm kwv yees li 400-550 MPa, tus yam ntxwv ntawm cov khoom siv dav dav- lub hom phiaj steel qauv.
A516 GR 70 muaj qhov tsawg kawg nkaus tawm lub zog ntawm kwv yees li 260 MPa (38 ksi), zoo li tsuas yog me ntsis siab dua A36. Txawm li cas los xij, nws lub zog tensile feem ntau ncav cuag 485-620 MPa. Qhov tseem ceeb tshaj, nws imposes meej cov cai rau kev cuam tshuam toughness. Tus txheej txheem feem ntau tswj hwm Charpy V- ntsuas qhov ntsuas qhov cuam tshuam kom ntseeg tau tias cov khoom muaj peev xwm nqus tau lub zog txaus ntawm qhov ntsuas kub, qhov A36 tsis xav tau cov ntsiab lus toughness.
Toughness
Hauv cov hlab ntsha siab thiab cov cuab yeej siv siab, cov khoom siv tsis ua haujlwm feem ntau tsis yog los ntawm lub zog tsis txaus tab sis los ntawm kev tawg sai sai. A516 GR 70 tau tsim tshwj xeeb los daws qhov kev ua tsis tiav no. Los ntawm kev tswj kev sib xyaw ua ke, cov txheej txheem dov, thiab qhov yuav tsum tau ntsuas qhov cuam tshuam, nws tswj cov pob txha tawg siab txawm tias qis dua - kub lossis kev ntxhov siab - cov ntsiab lus siab.
Thaum A36 nthuav tawm cov yas zoo nyob rau hauv chav tsev kub, nws cov tawv tawv tsis tau lees paub ntawm qhov kub thiab txias lossis hauv cov phaj tuab. Siv A36 rau siab-cov kabmob lossis cov ntawv thov cryogenic feem ntau xav tau kev tshuaj xyuas ntxiv lossis txawm tias kuaj, txwv tsis pub ua rau muaj kev pheej hmoo nyab xeeb.
Weldability thiab Fabrication Suitability
Ob leeg steels muaj kev weldability zoo, tab sis muaj qhov sib txawv. A36, nrog rau nws yooj yim muaj pes tsawg leeg thiab tsis tshua muaj carbon sib npaug, muaj siab welding txheej txheem kam rau ua, ua rau nws tsim nyog rau kev tsim kho thiab loj -scale structural fabrication.
A516 GR 70, thaum sib npaug weldable, feem ntau yuav tsum tau ua raws li cov txheej txheem vuam nruj dua (WPS/PQR) hauv kev tsim cov hlab ntsha siab, feem ntau ua ke nrog tom qab-weld kho cua sov (xws li, kev ntxhov siab nyem annealing) kom muaj kev ntseeg ruaj khov thoob plaws hauv nws lub neej.
Daim ntawv thov Scenario
A36 yog qhov tsim nyog rau cov xwm txheej feem ntau cuam tshuam nrog cov qauv thauj khoom-cov kabmob, ib puag ncig ib puag ncig, thiab kev tswj tsis tau qhov tshwm sim. A516 GR 70 yog tsim rau cov cuab yeej ua haujlwm nyob rau hauv lub siab, yuav tsum muaj siab toughness thiab kev nyab xeeb, thiab qhov uas tsis ua hauj lwm yuav tshwm sim hnyav.
Ib qho kev xav tsis zoo hauv kev ua haujlwm engineering yog sim hloov A36 rau A516 GR 70 nkaus xwb raws li cov txiaj ntsig zoo sib xws. Qhov kev hloov pauv no saib xyuas qhov sib txawv ntawm qhov cuam tshuam rau qhov hnyav, kev tswj kom zoo, thiab kev siv tau raws li tus qauv. Cov txheej txheem xaiv cov khoom tsim nyog yuav tsum nyob nruab nrab ntawm cov qauv tsim, hom tsis ua haujlwm, thiab cov kev cai tswj hwm.
Qhov sib txawv ntawm A516 GR 70 thiab A36, thaum lub ntsej muag pom zoo li cov qib steel sib txawv, qhov tseem ceeb qhia txog kev tsim lub tswv yim sib txawv ntawm - lub hom phiaj steel qauv thiab tshwj xeeb siab-cov kabmob steel. Kev nkag siab qhov sib txawv no ua kom yooj yim xaiv cov khoom siv muaj txiaj ntsig.
Yog tias koj tsis paub meej txog kev xaiv cov hlau phaj tsim nyog, thovqhia koj cov kev xav tau. Peb muab cov kev daws teeb meem customized.
