(a) list the four classifications of steels. (b) for each, briefly describe the properties and typical applications.

Type of steels and their uses :

Type                            Carbon percentage                           uses

Low carbon steel         0.1% to 0.3 %           Food cans ,car body ,nut & bolt.

Medium carbon steel    0.3% to 0.70 %   Metal chains ,wheel rims,wire ropes

High carbon steel         0.7% to 1.3%          Hammers,drills ,dies and taps.

High speed steel         0.6 %                     Cutting tools in lathe machine.

Type                                           Properties

Low carbon steel     -          Fairly strong and easily get rusty              

Medium carbon steel -       Having high hardness than low carbon steel

High carbon steel  -            Having high hardness than medium carbon steel

High speed steel  -             Harder ,can retain its shape at high temperature

firearm identification is the process of analyzing the bullets and cartridge cases left at a crime scene to determine if they came from a particular firearm. marks on the bullets and cartridges may be common to every firearm of that type. these are called class characteristics.