Vim tias nws tseem tsis tau muaj kev qhia ntxiv, nws lub hardness yog heev (HRB loj dua 90), thiab nws tsuas yog ua kom tau qhov yooj yim khoov tsawg dua 90 degrendicular).
Txhawm rau muab tso rau nws yooj yim, txias dov yog ua tiav thiab dov raws ntawm cov coil kub coils. Feem ntau hais lus, nws yog txheej txheem ntawm kub dov --- pukling --- txias dov.
Txias-dov yog ua tiav los ntawm cov ntawv kub-dov ntawm chav tsev kub. Txawm hais tias qhov kub ntawm cov ntawv steel yuav raug muab rhaub thaum lub sijhawm ua, nws tseem hu ua khaub thuas-dov. Vim yog cov nruam txias deformation ntawm kub dov, cov khoom siv mechanical kuj tsis zoo thiab lub hardness yog siab dhau. Nws yuav tsum tau tshaj tawm rau nws cov khoom siv kho tshuab, thiab cov uas tsis muaj annaling yog hu ua tawv coils. Hard-rolled coils feem ntau siv los ua cov khoom lag luam uas tsis tas yuav muaj khoov lossis ncab, thiab cov uas muaj tsawg dua li 1.0 tau dov ob sab lossis plaub sab nrog hmoov zoo.
