Business News Desk!!! One of the important building materials while building your home is steel and it plays a significant role in the cost of construction. So, we need to know the steel price per kg today. Steel is one of the most commonly used construction materials and expensive materials as the cost of steel is high as compared to others. No construction work can be completed without the use of steel. Steel bar reinforcement is used in concrete to provide its tensile strength because concrete is strong in compression and weak in tension.