Stud ntsia liaj qhov rooj
Ob chav kawg studs feem ntau yog tsim los ntawm ntau yam khoom zoo - zoo, xaiv raws li daim ntawv thov kev xav tau rau lub zog, durability, thiab corrosion kuj. Cov pa roj carbon steel yog ib qho ntawm cov khoom siv feem ntau, tshwj xeeb tshaj yog nyob rau qib xws li 4.8, 8.8, thiab 10.9.