Ua ntej, Hlau Tam sim no nyob rau ntawm kev ua lag luam nrog hlau ntau lawm ntau dua cov ntsia hlau, nws yog qhov pheej yig heev, kev ua haujlwm yog ntxhib. Tab sis peb txhua tus paub tias hlau muaj ib qho ua yuam kev loj tshaj. Ntawd yog, hauv huab cua yooj yim dua rau xeb, ib zaug xeb hlau screws ntawm kev sib txuas ua ke yuav raug txo ntau. Yog li ntawd, hauv kev lag luam twj paj nruag, yog tias siv cov hlau tsis quav, ntxiv rau nws cov kev ua kom raug yog qhov siab, tab sis kuj yuav tsum tau nrog nws qhov kev sib piv. Cov hau kev kho mob feem ntau yog blackened thiab galvanized. Txoj kev twg los xij, kev kho mob yog tsim los thaiv kev sib tiv tauj ntawm lub screws thiab huab cua, uas tiv thaiv nws ntawm xeb. Yog lawm, tom qab cov kev kho saum npoo no, tus nqi ntawm screws kuj yuav tsum tau nce ntau, qhov xwm txheej ntawm tib hom screws, hlau blackening ntawm cov ntsia hlau tiav lawm tus nqi thiab 304 ntawm tus nqi yog zoo ib yam. Yog li ntawd, qee qhov xwm txheej, tus nqi ntawm Dongguan screws tsis tuaj yeem txiav txim siab tsuas yog cov khoom siv.
Thib ob, carbon hlau Cov pa roj carbon steel kuj tseem siv tau ntau, hauv kev lag luam cov khoom lag luam, carbon hlau tsis yog ib hom xwb, nws muaj cov pa roj carbon tsis muaj steel, nruab nrab cov pa roj carbon steel, siab carbon steel thiab alloy steel plaub, cov kev faib tawm no yog ua raws li cov pa roj carbon cov ntsiab lus ntawm carbon hlau tau qhab nia. Cov pa roj carbon steel screws, cov hlau loj screws tsis tshua muaj, thiab nruab nrab carbon steel yog siv feem ntau.
Thib peb, stainless hlau screws. Cov ntaub ntawv hlau kuj tseem raug faib ua ntau yam, ib qho yog austenitic, cov khoom siv no kuj kub kub kuj, tab sis kuj muaj kev txhim kho corrosion, lwm tus yog martensite, martensite cov khoom tiv thaiv corrosion kuj ntau dua li austenite, tab sis nws kuj muaj ntau yam zoo, xws li nws coj tsis kam yog qhov zoo heev.
IV, tooj dag tooj dag tseem siv los ua cov txheej txheem Dongguan screws, vim tias tus nqi tooj dag yog qhov siab tshaj li carbon hlau thiab stainless hlau, yog li tus nqi dav ntawm tooj liab screws yog tus nqi ntau.