EFFECT OF HOT DIPPING ALUMINIZING ON THE TOUGHNESS OF LOW CARBON STEEL

Steel that has been aluminized said as hot dipping aluminizing has better protection against corrosion and can protect against temperatures as high as 800°C . In hot dipping aluminizing, Steel is immersed into a molten aluminium for certain dipping time. The research aims to know the effect of preheating and dipping time on the toughness of low carbon steel. The method research was started by cutting the low carbon steel plate, according to ASTM E23 (Charpy test sample) into 16 pieces samples. Then the samples were grouped into four groups. G roup -1 was initial samples. The G roup -2 was directly immersed into molten aluminum 700 0 C, for dipping time 5 minutes. The Group-3 was preheated at 700 o C for 30 minutes and then to be aluminized (700 o C) for dipping time 5 minutes. The Group-4 was preheated at 700 o C for 30 minutes and then to be aluminized (700 o C) for dipping time 10 minutes. Finally, all groups were tested by the C harpy test at room temperature. The results show that the aluminizing increases the toughness of low carbon steel from 228 . 125 KJ/m 2 to 312 . 5 KJ/m 2 . The preheating process before aluminizing increase s sharply the toughness of low carbon steel from 228 . 125 KJ/m 2 to 512 . 5 KJ/m 2 . The increasing dipping time from 5-minute to 10-minute in crease gradually the toughness from 512 . 5 KJ/m 2 to 556 . 25 KJ/m 2 .