AN INVESTIGATION INTO SOME PROPERTIES OF REINFORCING STEEL BARS MANUFACTURED BY NIGERIAN SPANISH ENGINEERING COMPANY, KANO.
Publication Date : 01/08/2007
Some properties of steel bars for concrete reinforcement produced by Nigeria Spanish Engineering Company, Kano were investigated. The properties investigated were chemical composition, yield strength, tensile strength, percent elongation at fracture, and hardness. The results obtained were compared with standard values set by the Standards Organisation of Nigeria (SON). The steel bars under investigation did not carry any specification, contrary to the requirements of the SON. The comparisons were based on grade 410HD. Two of the investigated samples had carbon compositions of 0.38% and 0.28%, which are within acceptable limits while the third had carbon composition of 0.47%, which is above the acceptable maximum of 0.39%, however, they all had high amounts of residual elements. The samples all met the minimum yield strength requirement of 410N/mm2 with percent elongation values greater than the minimum acceptable limit. There was lack of uniformity in the chemical composition and properties of products of different product batches.
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