Vim li cas tooj liab tseem ceeb?
Tooj liab yog cov hlau siv dav siv rau kev nqa hluav taws xob, vim nws cov khoom siv hluav taws xob siab, thiab feem ntau yog cov hlau uas pheej yig tshaj plaws rau siv hauv cov khoom siv hluav taws xob. Raws li cov thev naus laus zis niaj hnub no muaj kev vam khom rau hluav taws xob thiab nws cov kev cuam tshuam nrog cov txheej txheem, tooj liab yog qhov tseem ceeb rau kev ua neej nyob niaj hnub no thiab tshwj xeeb tshaj yog rau kev hloov pauv ntawm lub zog mus rau kev lag luam qis. Copper kuj tau txais txiaj ntsig los ntawm kev ua cov hlau tiv taus corrosion thiab nrog siab malleability, txhais tau tias nws tuaj yeem tsim rau hauv ntau hom kev tsim cov khoom sib txawv, xws li xov hlau, pas nrig, raj thiab tuav. Ua tsaug rau cov khoom no, tooj liab tau siv dav hauv kev lag luam, suav nrog kev tsim kho, kev tsim vaj tsev, kev thauj mus los thiab cov khoom siv.
Kev siv tooj liab thoob ntiaj teb haum rau hauv peb pawg tseem ceeb: hlau, lwm yam ntaub ntawv - xws li cov raj, rods thiab daim hlau - thiab alloys. Ntawm cov kev lag luam uas siv tooj liab, 40% ntawm kev siv yog siv rau hluav taws xob hauv kev tsim kho, kev tsim kho vaj tse thiab kev lag luam, ua raws li 23% ntawm kev siv hauv kev tsim cov khoom dawb thiab lwm yam khoom siv.1
Muab ntau yam kev lag luam siv tooj liab, nws ib txwm tau pom tias yog qhov ntsuas kev noj qab haus huv rau kev lag luam thoob ntiaj teb: thaum lub ntiaj teb kev lag luam kev lag luam loj hlob, kev tsim cov khoom lag luam yuav nce ntxiv thiab kev thov rau cov khoom siv tseem ceeb (xws li tooj liab) nce. Tus nqi tooj liab tau ntev dhau los ua qhov taw qhia kev lag luam, ua ntej lagging ntsuas, xws li cov ntaub ntawv kev ua haujlwm thiab kev nce nqi. Tus nqi tooj liab yog cuam tshuam los ntawm lwm yam, suav nrog thoob ntiaj teb mine cov khoom lag luam ntawm thawj tooj liab, cov nqi rov ua dua ntawm cov khoom siv tooj liab, thiab cov khoom siv dag zog xws li kev lag luam tariffs. Nyob rau hauv xyoo tas los no, kev thov hloov mus rau cov haujlwm cuam tshuam nrog kev hloov pauv hluav taws xob tau txhawb nqa tus nqi tooj liab, txo qis kev sib raug zoo nrog cov theem ntawm kev loj hlob ntawm kev lag luam.
