Question

Q1 (a) Ferrous material could be divided into two categories which are steel and cast iron. List two (2) classification of steel and give one example of its application for each type of steel. (4 marks) (b) Below is the list of ferrous metals and its alloy together with its typical application in the UNS (Unified Numbering System) designation form. F3XXXX - High-strength gears and machine components (ii) KIXXXX - Automobile industries N04XXX - Valves/pumps for corrosive industry processes (iv) S3XXXX - Chemical and food processing equipment T3XXXX - Punches, drill bit (vi) G1XXXX – Paper clip Identify the ferrous metal based on its UNS and application as stated above. (6 marks)

Answer 1

(a) Sleels can be classified into two category, which are listed as below- Sleels Low alloy Highalloy ske! Low-Carbon steel Medium Carbon steel Low Slainless sleel. High carbon steel How alloy steel: (<10% wt) Carbon > Medium Carbon > High carbon. Low alloy sleel has application in following application - Automobile panels, nails, wise pine, structural and steel pipe, Low temperahre pressure vessels. High alloy sleel: In high alloy steel, perten tage g alloying element is greates than 10 % by cueight. for eg. Stainless steel. Application Automotive exhaust components, tanks for agricultural sprays, high temperature values, glass molds Com bushion chambers, jet engine Dasts, etc. (6) System - ㅋ In UNS → (i) F3 XXXX here 'f' stands for Cast-iron metal type. ) KiXXXX > here 'R' stands for miscellenous steels and ferrous alloys. (ii) NO4 XXX Nickel and nickel alloys. (iv) 53XXXX Heat and corrosion resistant (stainless) Steels. Tool steels, wrought and cast. SAE Carbon and ferrous metal based alloy having High strength gears and machine components. Cam Scanner alloy sheets. W T3 XXXX (vi) G1 XXXX In above given example, f3XXXX applicationndad is