Feem ntau hais lus, txias rub hlau tseem hu ua khaub thuas rub hlau, uas yog ib lub npe siv rau hlau hlau hauv kev lag luam. Feem ntau, cov neeg uas tsis tau raug mob khaub thuas-daws hlau yuav tsum tsis paub txog lub npe no. Qhov tseeb, yog tias koj paub cov txheej txheem tsim cov hlau hlau, koj yuav paub lub hauv paus ntawm lub npe. Ntawm no yog ib qho kev qhia txog cov txheej txheem ntawm cov khoom siv txias txias thiab cov yam ntxwv tseem ceeb ntawm cov khoom siv no.
Cold drawn wire yog ib hom hlau uas siv ntau heev, uas yog siv rau hauv ntau qhov kev lag luam. Nyob rau tib lub sij hawm, txias drawn hlau yog ib hom hlau txias ua hauj lwm. Cov khoom siv raw yog hlau qws, uas yog qhov peb feem ntau hu ua hlau. Cov khoom tsim los ntawm ntau cov txheej txheem xws li shelling. Nws yog peb hom hlau hlau. Ordinary round steel, yog tias nws raug yuam los ntawm lub qhov me dua nws txoj kab uas hla, txoj kab uas hla ntawm cov hlau puag ncig yuav me dua thiab qhov ntev yuav elongated. Rov ua cov txheej txheem no yuav ua rau cov hlau puag ncig me dua.
