Thaum yuav daim ntawv ncig- txiav cov hniav, lub hauv paus tseem ceeb yog kom sib npaug sib npaug, ua haujlwm ntev, thiab tus nqi- ua tau zoo, ua kom raug raws li cov xwm txheej siv. Qhov no tuaj yeem tsis tsuas yog zam kev pheej hmoo ntawm kev yuav khoom tab sis kuj tseem tswj tau ntev - cov nqi hloov pauv, ua tau raws li cov kev xav tau tseem ceeb ntawm kev yuav khoom ntau, kev ua tau zoo, thiab kev thaj yeeb ntawm lub siab hauv kev yuav khoom.
Khoom siv yog tus yuam sij rau kev xaiv; Qhov tseem ceeb yuav tsum tau muab rau kev xaiv raws li qhov xav tau: Cov khoom siv hlau alloy muaj cov nqi ua tau zoo, tsim nyog rau kev ua haujlwm txhua hnub thiab kev txiav me me rau nruab nrab. Nws yog hnav- tiv taus thiab tsis yooj yim rau nti, nrog cov nqi khoom siv tswj tau. High- cov khoom siv steel ceev muaj kev hnav siab dua, haum rau kev lag luam- qib siab- zaus thiab cov ntawv tuab. Nws muaj qhov hloov pauv tsawg zaus, ua rau ntev -kev yuav khoom tus nqi ntau dua- zoo. Nws raug nquahu kom tsis txhob xaiv cov pa roj carbon steel tsis zoo, uas, txawm hais tias tus nqi qis hauv chav tsev, nws yooj yim rau xeb thiab hnav, yog li nce tus nqi tag nrho.
Thaum yuav khoom, nws yog ib qho tsim nyog yuav tsum tau kuaj xyuas cov kab hauv qab, sab nraud, thiab tuab ntawm cov hniav kom paub meej tias kev hloov pauv ntawm cov khoom siv. Tib lub sijhawm, kev saib xyuas yuav tsum tau them rau tus neeg muag khoom kev ruaj ntseg thiab tom qab - muag tau lav. Cov qauv tuaj yeem raug kuaj ua ntej kev yuav khoom ntau kom tsis txhob qis - nqi thiab cov khoom lag luam qis, thiaj li xaiv tus nqi zoo- cov khoom siv tau zoo.
