Introduction of steel (types, mechanical properties, stress-strain curve, advantages and disadvantages).
Steel - It is an important structural material which is broadly used to construct structural member. It is an alloy of pure iron, carbon, chromium, Nickel and some other elements. In the steel, corrosion exists. Stainless steel - It is the alloy of pure iron and chromium. 11% chromium content are present. It is a corrosion resistance material. Types of steel - Effect of carbon content on steel characteristics- If carbon content in steel increases, the strength, hardness and brittleness will increase. If carbon content in steel decreases, the strength of steel will decrease and ductility of the steel will increase. Steel becomes soft. Stress-strain curve of Mild steel - OAB - It represents a straight line curve. The strain produced is proportional to the stress producing it. i.e, it obeys Hooke's law. A - represents the limit of proportionality - the stress beyond which linear variation ceases. B - represents the elastic limit - the maximum stress up to which a specimen regains its