D/DD/IF STEEL

Specific variety of Cold Rolled Sheets/ Strips with specific chemical composition used in Tin Mills are known as Tin Mill Black Plate (TMBP).

COATED PRODUCTS : There are cold rolled products coated with metals or organic chemicals as under :
GALVANISED PLAIN/ CORRUGATED (GP/GC) SHEETS : These are Cold Rolled Sheets/Strips coated with zinc metal. Process is known as Galvanising. Used in roofing, paneling etc. GP sheets are normally produced by Hot Deep Galvanising of CR Sheets/Strips in liquid zinc bath. GC sheets are obtained upon corrugating of GP sheets in corrugating machine.
GP sheets are also produced by electroplating of zinc on CR sheets/strips when the process is known as Electro-Galvanising. Galvanised sheets are used mainly in roofing, paneling, automobile bodies, Trunks/Boxes etc.
TINPLATE : TMBP coated with tin metal. Used for manufacture of containers.
TIN FREE STEEL: TMBP sheet/strips coated with chromium metal and chromium oxide.
COLOUR COATED PRODUCTS : Cold Rolled/ galvanised steel sheets/strips coated with PVC/ plastics or any other organic material. Process known as Colour Coating. Used for manufacture of furniture, auto bodies, roofing, paneling etc.
TERNI PLATE: Cold rolled steel sheets/strips coated with an alloy of tin and lead, used in manufacture of Petrol Tanks for automobiles. Not produced in India.
GALFAN ALLOY COATED SHEETS: These are CR Sheets/Strips coated with an Zinc- Aluminium alloy comprising of 95% zinc and 5% aluminium. Uses are similar to GP/GC sheets but it has better life and better corrosion properties.
GALVALUME ALLOY COATED SHEETS: These are CR Sheets/ Strips coated with an alloy comprising of approx. 55% aluminium and approx. 45% zinc with nominal amount of silicon. Uses are similar to that of GP/GC sheets but it has better life and much better high temperature performance.