Raws li / NZS 3679.1 txwv cov ntsiab lus carbon nyob hauv 300 yam cap channel steel rau 0.25% max. Cov pa roj carbon txhim kho kom muaj zog tab sis ua rau muaj kev pheej hmoo ntawm qib siab:
Brittleness: Tshaj tawm cov pa roj carbon ntau dhau ntawm kev cuam tshuam, tshwj xeeb tshaj yog nyob rau hauv kev cuam tshuam lossis cyclic loads (piv txwv li cov tsheb loj catrations ntawm cov choj).
Weldability poob: Carbon cov ntaub ntawv nyuaj, tawg-nquag microstructures (piv txwv li, martensite) hauv tshav kub-cuam tshuam rau vuam. Ib qho 0.25% CAP tso cai rau 300 hloov tau ® yog welded ntawm cov qauv kev txwv ( Kev sib tw tom qab ntau lawm, txhua pob yog kuaj, nrog cov ntsiab lus carbon rau hauv cov ntawv pov thawj. Qhov kev tswj hwm no ua kom pom tseeb 300 hloov Edains Fabrication daws tau thaum lub rooj sib tham xav tau.