Suppose you are appointed as a material engineer at an industry company. The company produces, cutting tools, various car and truck spare parts using different steels. The steels as raw materials to make the parts. All steels are round bars with 50 mm in diameter and 5 m long. However, when the materials were delivered to the company, for some reasons the five different types of steels were mixed up (All the labels are disappeared). Your manager asked you to sort out the mixed steels within a week. There are no chemical composition analysis facilities available. The only information you have is from the delivery documents, where it shows that the materials are pure iron, 1040 steel, 1070 steel, O1 tool steel and 4340 steel. You are asked to provide at least two techniques/methods to successfully complete your task assigned by your manager, and to explain why your techniques/methods will work.