1. Dab tsi yog thawj daim ntawv thov ntawm ASTM A672 steel yeeb nkab?
Teb: ASTM A672 qhia meej seamless thiab hluav taws xob -kuj-welded (ERW) carbon steel yeeb nkab npaj rau siab - kub kev pab cuam nyob rau hauv fais fab nroj tsuag, muaj boilers, tshav kub exchangers, thiab lwm yam kev siv lub nkoj siab. Nws yog tsim los ua haujlwm nyob rau hauv qhov kub siab (feem ntau mus txog 1000℃F / 538 degree) thiab nruab nrab mus rau qhov kub siab.
2. Cov ntaub ntawv dab tsi tau them raws li ASTM A672, thiab lawv txawv li cas?
Teb: ASTM A672 suav nrog ntau qib (piv txwv li, C60, C65, C70, C75, C80, C85, C90, C95, C100, C105) muab faib los ntawm lawv qhov tsawg kawg nkaus yield zog (xws li 60 ksi txog 105 ksi) thiab tensile zog. Cov lej siab dua - qib qhia tau hais tias muaj zog dua txhua yam, nrog rau kev sib txawv ntawm cov tshuaj muaj pes tsawg leeg (xws li, carbon, manganese cov ntsiab lus) los txhawb kev ua tau zoo hauv kev ntxhov siab.
3. Cov txheej txheem tsim khoom dab tsi tau tso cai rau ASTM A672 steel yeeb nkab?
Teb: Tus qauv tso cai rau ob txoj kev tsim khoom tseem ceeb:seamless(tsim tsis muaj weld seam, ntawm tho thiab dov) thiabhluav taws xob -tsis kam vuam (ERW)(tsim los ntawm tiaj tus hlau strips thiab welded siv hluav taws xob tam sim no tsis muaj cov hlau muab tub lim). Ob txheej txheem yuav tsum tau ua raws li nruj me ntsis kam rau ua thiab weld zoo yuav tsum tau teev nyob rau hauv tus qauv.
4. Dab tsi yog qhov tseem ceeb ntawm cov tshuaj muaj pes tsawg leeg rau ASTM A672 yeeb nkab?
Teb: Cov ntsiab lus tseem ceeb ntawm cov tshuaj raug tswj xyuas kom ntseeg tau tias muaj cua sov thiab cov khoom siv kho tshuab: carbon (C) cov ntsiab lus feem ntau yog li ntawm 0.15% mus rau 0.30% (nws txawv ntawm qib), manganese (Mn) los ntawm 0.80% mus rau 1.60%, phosphorus (P) thiab sulfur (S) raug txwv rau qhov siab tshaj plaws ntawm 0,03% tso cai rau txhua Sicon (Sicon). 0.10% thiab 0.40%. Qee qib yuav suav nrog cov ntsiab lus xws li vanadium lossis niobium rau kev ntxiv dag zog.
5. Dab tsi yog qhov kub ntawm ASTM A672 yeeb nkab tsim los tiv thaiv?
Teb: ASTM A672 yeeb nkab yog ntsuas rau kev pabcuam txuas ntxiv ntawm qhov kub txog li1000℃F (538 degree). Rau luv luv -lub sij hawm los yog kev ua haujlwm tsis tu ncua, nws tuaj yeem tiv taus qhov kub thiab txias me ntsis, tab sis qhov ntev ntev tshaj li 1000℃F tuaj yeem ua rau nws cov khoom siv kho tshuab tsis zoo. Tsawg dua - qhov kub thiab txias kev ua tau zoo kuj tau teev tseg, nrog rau qhov yuav tsum tau muaj kev cuam tshuam ntawm -20℃F (-29 degree) rau qee qib.
