Q2. EXPLAIN THE KINDS OF STEEL.
(MVE THE CLASSIFICATION OF STEEL AND DIFFERENT KINDS OF STEEL ARE USED IN WHAT LINES OF PRODUCTION? EXPLAIN.
“STEEL IS ONE NAME BUT IS OF MANY KINDS”. EXPLAIN THE STATEMENT.
Steel, on the basis of its nature and components, can be classified into five kinds as under:
1. CARBON STEEL:
Most of the kinds of steel in use are classified as ‘carbon steel. The proportion of carbon in different kinds of carbon steel but Manganese proportion is not more than 1.65 per cent nevertheless; the proportion of Silicon is 0.60 per cent and copper is also 0.60 per cent. In other words, Manganese, Silicon and Copper are mixed in Carbon Steel. Carbon steel is used for making springs for bed mattresses, structure of the ships, buildings structure, motor cars body and machines.
2. ALLOY STEEL:
Different kinds of Alloy steel are being made in which different proportions of various metals are mixed to change their properties so that they could be used for desired purposes. 20 per cent in the world production of steel is constituted by Alloy Steel. If a certain proportion of Vanadium and Molybdenum is mixed, the steel becomes more hard and strong having the capability of bearing the shocks and vibrations. This is the reason that his kind of alloy steel is used for making the Excel and gear of motor vehicles. If high proportion of manganese is mixed in steel, steel becomes harder and is used for mining machines, electric machines and heavy machinery. If Nickel is mixed in steel, it becomes very hard to be used for boll bearings and armored plates. By mixing chromium, stool is converted into Stainless Steel and used in manufacturing such items which can be rusted like milk bottles and airplanes wings etc. If Tungsten and Cobalt is nixed in steel, it can be used in making iron cutting blades like blades of lath machines. By mixing Silicon and Copper, common steel is made.
3. HIGH STRENGTH LOW-ALLOY STEEL:
This kind of steel is the most modern invention amongst all the kinds of steel in use which is also termed as HSLA. It is called low alloy’ because the cheap metals are mixed in this kind of steel. But this steel is stronger than that of carbon steel. For example, loading trucks and vehicles are made of this steel because the walls of the vehicle are light in weight hut stronger that the Carbon Steel.
4. STAINLESS STEEL:
Nickel, Chromium and other elements are mixed in Stainless Steel. Stainless steel is not only strong but it can retain its glittering and is saving from rusting and moisture. Gases and acids do not affect the stainless steel. Stainless steel is used for making chemical plants and petroleum refining pipes. Apart from it, it is also used for airplanes and space capsules.
Surgical instruments are also made of stainless steel. In the home a kitchen, food processing plants and or cutlery making, stainless steel is utilized because this metal is not only rust proof but it can also be cleaned easily.
5. TOLL STEEL:
Toll steel is fabricated in the bands of different tools and implements. It is also used in machines generated by energy. Molybdenum, Tungsten and such other metals are mixed in Toll Steel which provides iron extra ordinary strength, hardness and power of resistance.