INTRODUCTION — Zinc is one of the four most important metals from the standpoint of quantity used in our highly industrialized civilization, being exceeded only by steel, aluminium and copper, in that order. — Zinc is white blue in colour with a ...

CHARACTERISTICS OF TOOL AND DIE MATERIALS Hardness: Hardness is the property of a material to resist pene­tration by another material. Tool has to be harder than the job material to be removed. Wear resistance: Ability to resist abrasion (in sliding contact). Toughness: Ability ...

INTRODUCTION — Tool materials are used for making tools for working, shaping and cutting of metals. — Hacksaw and power-saw blades, drills, reamers, lathe, shaper, milling and broaching tools, press tool dies and punches, threading dies, etc., are all made from one ...

— Food processing, dewaxing of petroleum, liquefaction of gases, synthetic rubber manufacture, hydrocarbon polymerization, high altitude aircraft, and so on, are but a few of the industrial areas that need low temperature materials (e.g., steels). — As the temperature is lowered, ...

Materials for high-temperature service may be conveniently classi­fied on the basis of the major element or component of which they are composed. In some of the more complex superalloys developed in recent years, several elements may exert an equal influence. ...

1. Carbon steels 2. Tool steels 3. Cast non-ferrous materials 4. Cemented carbides 5. Ceramic tools 6. Diamond tools   1.   Carbon Steels — Plain carbon steel (C 1.4 to 1.5 %) is perhaps the oldest known tool material. — It was replaced by high speed steel, because it ...

— Zinc is a blue to gray metallic element. — Zinc has following characteristics : (i)       Relatively low melting point, 419.5°C (die-casting). (ii)      Good resistance to atmospheric corrosion. (iii)    Solubility in copper (brass). (iv)    Inherent ductility and malleability. (v)    Volume coef. of Ther Exp. 20-400°C...8.9 x ...