Nyob rau lub sijhawm dhau los ntev, peb hais kev sib raug zoo ntawm cov khoom siv, kev siv cov khoom siv tshuaj, tab sis siv zog hloov kho, vim muaj ntau yam ntawm cov kev hloov pauv ntau dua hloov dua siab tshiab. Ib qho ntxiv, tsis muaj neeg sib koom ua ke, sib txawv ntawm cov lus sib cav sib txawv, coj kev tsis sib haum xeeb nyob rau hauv lub hardness thiab muaj zog conversion hloov txiaj ntsig.
Txij li xyoo 1965, Tuam Tshoj Minerology kev tshawb fawb thiab lwm txoj kev sib raug zoo ntawm cov kev sim siab thiab kev tshawb xyuas ntawm cov hlau hluav taws xob thiab lub zog ntawm cov khoom siv hluav taws xob ntau, los ntawm cov ntaub ntawv pov thawj ntau lawm. Tsim peb tus kheej "Dub Hlau Hardness thiab Lub Zog Kev Txhim Kho Conterersion" Haum rau 9 steel series thiab tsis hais txog qib hlau. Hauv kev ua haujlwm pov thawj, ntau dua 100 chav uas koom nrog, tag nrho cov ntau tshaj li 3,000 tau ua qauv tau ua tiav, thiab ntau dua 30,000 cov ntaub ntawv tau ntsuas.
Cov ntaub ntawv pov thawj yog felly faib rau ob tog ntawm kev hloov pauv kev hloov pauv, thiab cov ntawv hloov pauv no yog qhov tseeb hauv txoj kev muaj tiag thiab muaj.
Cov lus qhia hloov dua tshiab no tau piv sib txawv nrog cov qauv hloov sib xws ntawm peb lub tebchaws yog kwv yees qhov nruab nrab ntawm kev hloov pauv ntau ntawm ntau yam muaj nuj nqis ntawm ntau lub teb chaws.
Lub sij hawm ncua: Mar-26-2024
