Cov yeeb nkab steel yog qhov feem ntau siv roj yeeb nkab project. Nws lub ntsiab zoo yog: siab zog, zoo toughness, bearing kev nyuaj siab, cuam tshuam tsis kam thiab nruj, zoo plasticity, yooj yim vuam thiab thermal ua, phab ntsa thickness yog thinner, txuag hlau. Tab sis nws tsis zoo corrosion kuj, yuav tsum muaj kev tiv thaiv corrosion zoo.

Cov yeeb nkab steel rau cov kav dej hauv lub nroog loj ntawm seamless thiab welded steel yeeb nkab hauv ob pawg. Lub zog siab seamless steel yeeb nkab, tab sis txwv cov txheej txheem ntau lawm thiab cov nqi los ntawm feem ntau me me txoj kab uas hla steel yeeb nkab DN200 hauv qab no. Ntau hom welded steel kav, vuam tuaj yeem muab faib ua ncaj seam welded steel kav thiab kauv welded steel yeeb nkab hom. Ntawm lawv, ncaj seam welded steel yeeb nkab (tom qab no hu ua ncaj seam yeeb nkab) kuj suav nrog LSAW steel yeeb nkab thiab siab zaus vuam (ERW) steel yeeb nkab thiab lwm yam. Kauv welded steel yeeb nkab (ssaw steel yeeb nkab) yog ib tug kauv seam ob submerged arc welded (HSAW) yeeb nkab.

Cov txheej txheem ncaj seam thiab kauv yeeb nkab raug muab piv, tus qub muaj qhov zoo ntawm:
① kauv yeeb nkab tsim cov txheej txheem los txiav txim siab lawv qhov kev ntxhov siab ntau dua li cov kav dej ncaj nraim, cov kav dej ncaj nraim nrog rau tag nrho cov txiaj ntsig ntawm kev nthuav dav, cov kev ntxhov siab nyob ze ze rau xoom, thaum lub kauv tsis tuaj yeem ua qhov no;

② kauv weld sab tsis ncaj ncees lawm feem ntau nyob rau hauv thaj tsam ntawm 1.1 ~ 1.2mm, tus qauv yuav tsum muaj tus nqi ntawm qhov tsis ncaj ncees lawm ntawm phab ntsa thickness kom tsawg dua 10% rau nyias-walled hlab, sab tsis ncaj ncees lawm yog ib qho nyuaj rau ua tau raws li tus qauv, thiab ncaj seam yeeb nkab tsis muaj qhov teeb meem no;

③ Piv nrog cov yeeb nkab ncaj seam, kauv weld kab ntws tsis zoo, kev ntxhov siab loj heev;

④ coil tshav kub cuam tshuam cheeb tsam yog ntau dua qhov ncaj seam yeeb nkab, thiab yeeb nkab kub cuam tshuam cheeb tsam yog tus yuam sij rau qhov zoo;

⑤ kauv geometry raug, mus rau qhov chaw tsim kho, raws li kev sib koom ua ke, vuam nqa qee qhov teeb meem.