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Hot Rolled Steel is available in wide variety of grades from basic drawing grades to high strength steel, some common grades as per Indian standards are as below:

• IS 2062 E250

• IS 2062 E350

• IS 1079 HR2

• IS 1079 HR3 etc.

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Below is the typical process flow for making flat Hot Rolled Steel in an integrated steel plant:

Iron Ore Mining > Ore Beneficiation & Pelletization > Iron Making > Steel Melting > Slab casting > Hot Rolling

• Cold Rolled steel will have closed thickness profile and good surface texture & flatness compared with Hot Rolled Steel.

• Hot Rolled Steel is rolled above Recrystallisation Temperature which helps in achieving desirable microstructure by process control, thus eliminating the need of any further heat treatment

• Cold Rolled steel is rolled below Recrystallisation Temperature due to which post rolling annealing is required to achieve desirable mechanical properties and microstructure.

• Better control in tolerances can be maintained in cold rolled steel

• Carbon Steel is generally classified as low carbon, medium carbon and high carbon.

• In low carbon steel the %C is < 0.20

• Low carbon steel is also termed as mild steel (MS).

Yes, Hot Rolled Steel can be welded easily.

Carbon Equivalent (CE) is a parameter which can be referred to judge the weldability of steel.

• Not available in thinner sections – generally available in t >= 1.6mm

• Dimensional tolerances are wide when compared to cold rolled steel

• Can not be used in applications where the aesthetic requirements are very stringent

• Narrow band of mechanical properties is difficult to achieve in Hot Rolled Steel

Yes, since steel is a ferrous metal (contains iron)

• Yes, since the major content is iron (Fe).

• When the Hot Rolled Steel is exposed to or stored in corrosive environment then rusting may take place, this can be avoided/reduced by taking precautionary actions such as good packaging during transportation, storage in dry conditions etc.