Cov yam ntxwv tuag: Qhov siab tshaj plaws ntawm cov phab ntsa thickness ntawm cov yeeb nkab steel ntawm tib seem, qhov tsawg kawg nkaus tus nqi tshaj qhov zoo sib txawv thiab tsis zoo sib txawv, los yog lub npe ntawm nominal phab ntsa thickness yog ± 8-10% (qhov txwv sab sauv ntawm cov phab ntsa tuab yog muab tso rau hauv cov phab ntsa nyias nyias)
Yog vim li cas: Lub perforation yuav tsum tau raws li qhov yuav tsum tau. Lub raj kawg saum npoo yog incisive, cua sov ntawm lub raj tsis zoo, lub raj yog rhuab tsis sib xws, cov khoom siv perforated tsis kho kom raug, thiab lub tshuab dov tsis kho kom zoo.
