Japanese txheem steel profiles muab ob peb yam zoo uas muaj txiaj ntsig zoo. Firstly, siab - kev tsim khoom zoo yog lub zog tseem ceeb. Japanese statmakers ua raws li cov txheej txheem tswj hwm nruj heev, ua kom cov khoom siv tshuab ua ke. Advanced tsim cov thev naus laus zis, xws li dov dolling thiab kev kho cua sov, tau ua haujlwm los txhim kho kev ua haujlwm ntawm cov profiles. Thib ob, zoo dua corrosion tsis yog feem ntau yog tus yam ntxwv. Cov kev kho tshwj xeeb ntawm cov kev kho mob thiab cov khoom siv alloy tau siv los txhim kho cov lus qhia uas tuaj yeem tiv taus ib puag ncig. Piv txwv li, huab cua cov qauv hlau ua raws li JIS cov qauv tuaj yeem tsim tus kheej {{}} tiv thaiv txheej xeb, txo qhov xav tau kev saib xyuas nquag. Thib peb, kev tsim kho tshiab hauv cov khoom tsim no muab cov khoom lag luam Japanese tau. Lawv feem ntau tsim los ua kom tau kev lag luam tam sim no, zoo li lub teeb yuag txawm tseem muaj siab dua siab tau siv nyob rau hauv Japanese Automalive thiab Aerospace channel thiab aerospace channelive thiab aerospace channel. Tsis tas li ntawd, Japanese statmakers muaj cov kev pab kho zoo ua haujlwm thiab tom qab {12} Kev muag khoom, uas pab nyob rau hauv lub tsev ntev- term neeg cov neeg siv khoom sib raug zoo.