Effect of Calcium Treatment on Low Temperature Toughness of Corrosion Resistant Steel

In order to stabilize the low temperature toughness of corrosion resistant steel,effect of calcium treatment on low temperature toughness of corrosion resistant steel has been studied.The results show that compared with the traditional calcium treatment process,the modified calcium treatment process can greatly improve the low temperature impact properties of steel tested at the temperature of -20℃ and -40℃.When the inclusions are spherical calcium aluminate +CaS composite inclusions and dispersed,the test steel at -20℃ impact energy(transverse) was improved by 24.6%,and the value at -40℃ impact energy(transverse) was improved by 44.5%,and the impact values the sample along longitudinal direction was improved by 33.7% and 32.7% respectively.The modified calcium treatment technology can improve the absorption rate of[Ca] in the molten steel which makes it more effective and a steel plate of with satisfied low temperature impact toughness was obtained.