Growing Chinese Presence in South Asia Introduction Growing Chinese influence in South Asia has been very evident in the past few years. When Sri Lanka decided to develop the Hambantota port and areas around it, the Sri Lankan government was not very keen on taking assistance [...]
Ans·. The effects of various alloying elements are as follows (i) Nickel- (a) Nickel increases hardness, toughness and impact strength at low temperature. (b) Improves response to heat treatment especially in large sections. (c) Improves elasticity, resistance to fatigue and corrosion. (ii) Chromium - (a) It forms a complex series [...]
Ans. An alloy steel may be defined as steel to which elements other than carbon are added in sufficient amount to produce improvements in steel. Commonly used alloy elements are nickel. chromium, manganese, silicon, molybdenum, vanadium, phosphorus, tungsten, titanium, copper, zirconium, cobalt and aluminium. These elements may be [...]
Ans. The differences between ductility and malleability are given below –
Ans. The material properties which are associated with the ability of the material to resist mechanical forces and loads are known as mechanical properties. The mechanical properties are a measure of the strength and lasting characteristics of a material in service. Some important mechanical properties are described below [...]
Ans. Fig· 1.1 shows an Iron-carbon equilibrium diagram since any iron carbon alloy in the molten state may be considered as a solution of iron carbide Fe3C in iron. Therefore, it is also called as iron-iron carbide equilibrium diagram. An equilibrium phase or constitutional diagram is a [...]
Ans. A plain carbon steel is an alloy of pure Iron and carbon. Depending upon the percentage of carbon content they may be classified as – (i) Low carbon (or mild) steel (ii) Medium carbon steel ( iii) High carbon steel. (i) Low carbon (or mild) steel- mild steel [...]
Ans. As the name indicates, high speed steel is used for high speed cutting tools. These steels can be divided into two groups depending upon the principal alloying element. The first group is called tungsten high speed steels and is designated by T-series. Steels of this group [...]
Ans- (i) mild steel- mild steel contains 0.05 to 0.3 carbon. It is further classified into three types- (a) Dead mild steel - 0.05-0.15% c (b) Mild steel - 0.15 - 0.2% c (c) Mild steel - 0.2 _0 3% Properties – Various properties of mild steel are [...]
Ans. According to IS : 7598-1974 steels shall be classified as follows- (i) Unalloyed or plain carbon steels (ii) Alloy steels. Other criteria of classification of steels are discussed below – Classification of Steels depending upon the Carbon Content- the unalloyed or plain carbon steels varying from 0.05% [...]
Ans. Steel is an alloy of iron and carbon, with the carbon content varies upto 1.5%. The carbon is distributed throughout the metal as a compound (chemical combination) with iron. If the carbon is raised above 1.5%, a stage soon arrives when no more carbon can be [...]
Ans. Composition- Wrought iron is the purest form of iron. It contains less than 0.1% carbon. It is a ferrous material and more corrosion resistant than steel. Wrought iron produced by puddling process contains carbon content less than 0.03%, silicon is about 13%, sulphur is less than 0.02%, [...]
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