ASTM A671 - Txuj Specification rau Hluav Taws Xob Fusion Welded Hlau Yeeb Nkab rau Atmospheric thiab qis dua.
ASTM A672 - Txuj Specification rau Hluav Taws Xob Fusion Welded Steel Yeeb Nkab rau Kev Pabcuam Siab Siab ntawm Cov Kub Kub.
Qhov sib txawv ntawm ASTM A671 thiab ASTM A672:
Qhov sib txawv tseem ceeb ntawm ASTM A671 EFW thiab ASTM A672 EFW yog daim ntawv thov scenarios, qhov kub thiab txias, cov khoom siv, cov qauv kev faib tawm, cov txheej txheem vuam, cov kev ntsuas thiab qhov loj me:
1. Cov chaw siv
ASTM A671: Feem ntau yog siv los tsim hluav taws xob fusion welded steel kav rau qhov kub thiab txias, haum rau cov hlab ntsha siab (xws li Chav Kawm 1 txog Chav Kawm 3 lub nkoj siab) thiab cov khoom siv. Xws li cryogenic liquefied gas (LNG), cryogenic chemical pipelines, thiab lwm yam.
ASTM A672: Tsim los rau nruab nrab - kub thiab siab - kev thauj mus los siab, nws yog dav siv hauv cov kav dej rau cov kua dej xws li roj thiab cov nkev, hais txog kev ua haujlwm siab thiab ua haujlwm ntev. Xws li fais fab nroj tsuag cov kav dej, petrochemical pipelines, thiab lwm yam.
2. Siv tau qhov kub thiab txias
ASTM A671: Muaj feem xyuam rau qhov kub thiab txias ib puag ncig (tsawg kawg -50℃F / -45 degree)
ASTM A672: Muaj feem xyuam rau qhov nruab nrab qhov kub thiab txias (-20 ° F txog 800 ° F / -29 ° C txog 427 ° C)
3. Cov khoom siv
ASTM A671 Txuj:
Cov khoom siv yog lub siab lub nkoj zoo steel phaj, uas yuav tsum tau kho cua sov los txhim kho cov khoom siv kho tshuab (xws li lub zog tawm los txog li 60ksi). cov
Muaj feem xyuam rau cov kev ua haujlwm nyuaj (xws li kev kub siab thiab qhov kub thiab txias ib puag ncig), tab sis cov qauv tshwj xeeb (xws li A671CB) yuav tsum tau xaiv raws li cov ntawv thov scenario. cov
ASTM A672 Txuj:
Cov khoom siv yog tsim los ntawm cov txheej txheem hluav taws xob fusion vuam, nrog cov vuam zoo thiab lub zog ruaj khov, haum rau cov dej tsis muaj zog thiab kev xav tau kev thauj mus los zoo. cov
Cov kev qhia tshwj xeeb tuaj yeem kho tau (xws li dav dav ntawm txoj kab uas hla thiab phab ntsa tuab), thiab tus ntoo khaub lig-sectional shape yog lub raj puag ncig los ua kom cov dej ntws zoo. cov
4. Txuj kev faib:
ASTM A671 : Tus qauv npog cov qauv sib txawv (xws li A thiab B), sib xws rau cov kev xav tau ntawm kev ua haujlwm sib txawv. cov
ASTM A672 : Tsis muaj kev faib tawm zoo sib xws, tab sis kev sib koom ua ke kev qhia tshwj xeeb yog tsim raws li daim ntawv thov scenario (xws li roj thiab nkev). cov
Cov khoom siv qib sawv cev txoj kev sib txawv:
A671: "CL + tus lej" yog siv (xws li CL22, CL32)
A672: "Letter + tooj" yog siv (xws li B60, C70)
Cov txheej txheem ntawm cov khoom siv sib xws yog txawv:
A671: Feem ntau sib raug rau A516 thiab lwm yam qis - kub steel phaj
A672: Sib haum rau A285 (A series), A515 (B series), A516 (C series) steel daim hlau
5. Cov txheej txheem vuam thiab kev xeem yuav tsum tau ua
ASTM A671: Ntau qhov tseem ceeb ntawm qhov qis- qhov kub thiab txias, thiab cov kev cai nruj dua ntawm cov txheej txheem vuam yuav tsum tau ua thiab qis- ntsuas qhov ntsuas kub.
ASTM A672: Ntau qhov tseem ceeb ntawm qhov nruab nrab - qhov kub thiab txias ua haujlwm.
6. Hom loj ntau yam
Ob leeg tsim nyog rau cov kav loj - txoj kab uas hla (Ntau dua lossis sib npaug li 16 ntiv tes)
A672 muaj qhov dav ntawm phab ntsa tuab (txog 3 ntiv tes)
Cov lus qhia xaiv:
A671 yog qhov zoo dua rau qis- qhov kub thiab txias (xws li LNG)
A672 yog qhov zoo dua rau qhov nruab nrab - qhov kub thiab siab - cov xwm txheej siab (xws li lub zog cog hluav taws xob)
ASTM A691 yuav tsum raug txiav txim siab rau siab - qhov kub thiab txias (＞427 degree)
Hauv cov ntsiab lus, qhov sib txawv tseem ceeb ntawm ob qhov lus dag nyob rau hauv daim ntawv thov scenarios thiab cov khoom tsim - A671 tsom rau qhov siab - lub zog xav tau ntawm cov hlab ntsha siab thiab cov khoom siv, thaum A672 tsom rau kev ua tau zoo thiab kav ntev ntawm kev thauj mus los ntawm cov dej.
