Do you know GI steel well enough? GI steel, or also known as Zinc-coated steel or Galvanized steel In this video, I will be referring to it as GI steel. In the process of making GI steel, a steel sheet is first coated with zinc, before used to form other types of steel. This layer of coating acts as a protective layer, to prevent the steel from rusting or being eroded from environmental factors This makes GI steel longer-lasting and more durable than normal steel. By TIS standard, the zinc coating must be at least 60g/m2 thick Also, there are different types of GI steel Lets see what types do they have. 1. GI(H) GI(H) steel uses hot rolled steel as the main material to be coated with zinc, where the texture of the steel after coating will be coarser and rougher than using cold rolled steel. The steel used will have a quality standard of SGHC, based on TIS. 3243-2564 and usually use steel with a thickness of 2.0-3.2 mm. 2. GI steel GI uses cold rolled steel as the main material to be coated with zinc The steel texture after coating will be smoother than hot rolled steel The steel used will have a quality standard of SGCC, based on TIS. 50-2561 and currently, there is an improved version of TIS. 50-2565 The steel used has a thickness of 1-2 mm. These 2 types of GI steel are typically used in electrical appliances at home or in the office, and used to make pipes for construction work. For flat steel pipe, hollow steel pipe, round steel pipe, the steel must have a quality standard of STK or STKR 290-490, where the numbers at the end indicate its tensile strength, with the units 'MPa'. Based on TIS. 107-2561 But 'C Light Lip Channel' has a standard of G340-490, based on TIS. 2817-2562 3. GA or Galvanealed steel It uses cold rolled steel coated with zinc then proceeds to anneal the coated steel at least at 540 degrees celsius temperature. This causes a reaction between the steel and the zinc, producing a new alloy layer with steel and zinc mixed together This makes GA steel much more resistant to erosion than GI The outside texture is grey and dull, and easier for paint to adhere. GA steel is supported by TIS. 2985-2562 It uses steel with a thickness of 1-2 mm. GA steel is typically used in automotive industry but is not typically used for construction work because GA steel is much more expensive than GI steel so people usually use GI steel The 4th type of zinc-coated steel is 'MAZ' steel where it has a 5-13% of aluminium, and 2-4% of magnesium mixed in the zinc coat This makes MAZ steel 100% more long-lasting than GI steel. The steel used have a thickness starting from 1-2mm. And is under TIS. 2981-2562 which is the standard only for steel to be in further processes It is not in the current TIS. for it to be used to make other steel pipes But there is still JIS standard that supports MAZ steel I hopes this video helps you to understand the overall picture of GI steel!
