Abstract
Different heat treatments such as (Annealing, Normalizing, Hardening in oil, and Hardening in water) of low carbon steel (LCS) specimens were performed in electrical furnace at constant temperature of (850ºC). The aim of this work was to estimate the effect of each heat treatment of LCS specimens on their corrosion rate (CR) in sulfuric acid solutions at constant room temperature of (25±5ºC). The CR was measured, while the acid concentration (Cacid) and immersion time (T) were changed according to experimental plan. Computer program (Statgraphics/Experimental Design) was used to calculate the fitted linear model of corrosion rate of low carbon steel in terms of (Cacid, and T) for each heat treatment separately. The fitted linear models of CR were adequate, while the interactions of the operating parameters were negligible. The R- square statistic indicates that the models as fitted explain 81-93% of the variability in corrosion rate.
Highlights
Iron is the basic of steel, when carbon a nonmetal is added to iron in amount up to2%, the result is an alloy known as steel
The R- square statistic indicates that the models as fitted explain 81-93% of the variability in corrosion rate
The results of the microstructure test showed the effect of different heat treatments on the microstructure of low carbon steel specimens
Summary
Iron is the basic of steel, when carbon a nonmetal is added to iron in amount up to2%, the result is an alloy known as steel. Alloys contain such metal as chromium and/or nickel and/or such nonmetal as silicon and nitrogen. Carbon is the principle ingredient so called plain carbon steel and contain small amounts of manganese and silicon, but the amount of carbon has the most pronounced effect on properties and in the selection of suitable heat treatment [1]. Heat treatment can be defined as a combination of heating and cooling operation applied to the metal in solid state to obtain desired condition properties [2].
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