Dab tsi yog qhov yuav tsum tau kho cua sov tom qab vuam Q355 daim hlau?
Thick plates (>40mm) thiab cov khoom tseem ceeb yuav tsum tau muaj kev ntxhov siab- nyem annealing tom qab vuam ntawm 600-650 degree, nrog tuav lub sij hawm xam raws li phaj thickness (1-2 min / mm).
Cov khoom siv dav dav tuaj yeem ua kom txias tsis muaj kev kho cua sov, tab sis vuam deformation yuav tsum tau tswj.
22. Yuav ua li cas kom tsis txhob txias tawg hauv Q355 phaj vuam?
Tswj cov pa roj carbon sib npaug Tsawg dua lossis sib npaug li 0.43%; tsim nyog preheating thiab txheej kub; siv tsawg- cov khoom siv hydrogen vuam; qeeb txias lossis kev kho cua sov tom qab vuam; optimize welding sequence kom txo tau kev ntxhov siab concentration.
Dab tsi yog qhov kev tiv thaiv- txoj kev kho corrosion rau Q355 daim hlau?
Kev kho deg: Sandblasting mus rau qib Sa2.5 kom tshem tawm oxide nplai thiab xeb.
Txheej: Epoxy zinc-nplua nuj primer + epoxy micaceous hlau oxide nruab nrab xim + fluorocarbon topcoat, qhuav zaj duab xis thickness Ntau dua los yog sib npaug rau 120μm.
Ib puag ncig tshwj xeeb: Siv weathering steel Q355NH nyob rau hauv cov cheeb tsam corrosive hnyav, los yog kub-dip galvanized steel nrog hnyav-lub luag haujlwm tiv thaiv- xeb txheej.
24. Daim ntawv thov zoo ntawm Q355 weathering steel (Q355NH) yog dab tsi?
Nws cov atmospheric corrosion kuj Performance index Kuv Ntau dua los yog sib npaug rau 6.0 yog 2-3 zaug siab dua li Q355 zoo tib yam, txo cov txheej txheem tu thiab ua rau nws haum rau sab nraum zoov txuas hniav thiab Hoobkas steel qauv.
25. Cov qauv kev tiv thaiv hluav taws yog dab tsi rau Q355 steel qauv?
Raws li "Technical Specification for Fire Protection of Steel Structures," hluav taws- cov txheej txheem yuav tsum raug xaiv raws li qhov ntsuas hluav taws kub (1.5h / 2.0h / 3.0h). Lub thickness ntawm cov txheej tuab yuav tsum tau hloov kho raws li seem modulus ntawm cov tswv cuab ntawm cov qauv.