Successfully reported this slideshow.

Difference between various coated steel products

16,040 views

Published on

Published in: Technology, Business

Difference between various coated steel products

  1. 1. www.knowyoursteel.com by Madhusoodhanan Sayeenathan www.knowyoursteel.com
  2. 2. Why Metal Coated Steel?  The basic purpose of coated steel is to prevent corrosion and enhance the surface life of base metal. Zinc acts as a cathodic protection and prevents the base metal from corroding.  The coating protects the surface of the steel from oxidation and it is also used to enhance the appearance of the material.  Each of these coated steel has its own application, depending on where they are used and to which environment they would be exposed to. www.knowyoursteel.com
  3. 3. Metal Coated Steel Products  Galvanized (GI) – Hot Dipped & Electrogalvanized  Galvannealed(GA)  Galvalume (GL)  Galfan  Aluzinc  Pre-Painted Steel  Tin plate www.knowyoursteel.com
  4. 4. Metal Coated Steel Products  Only first 4 categories are considered in this presentation, since they are the most widely used coated steel products.  Aluzinc, Pre-painted Steel and Tin plate are not covered in this article. www.knowyoursteel.com
  5. 5. Differences between coated Steel Products S.No 1 Parameter Galvanized Galvalume Galfan Zinc on Steel Zinc reacts with Iron to form Zn Iron Alloy 43.5%-Zn; 55%- Al ; 1.5% Si 95% Zinc ; 5% - Al Z ZF AZ ZGF/ZA Ducting, roofing Coating Galvaneealed Deep drawn automobile parts/ outer panels Metal Buildings, roofing White goods/some auto parts 3 2 4 5 2 Coating Designation 3 Application 4 Corrosion Resistance ( 1 to 5 scale) 5 Spangle Yes for HDGI No No No 6 Process Hot Dipped/Electro galvanized Hot Dipped Galvanizing followed by Annealing Hot Dipped continuous Hot dipped continous www.knowyoursteel.com
  6. 6. Trademarks  Galfan is the most recent invention of the above.  Galvalume and Galfan are registered and patented trademarks brands and only those manufacturers with license from the brand owners can produce and sell in these brands.  There are different grades within each variety of above products based on 1. Strength of the Steel. 2. Coating Mass – Amount of coating 3. Surface protection (Oiling, chemical passivation, organic passivation) 4. Surface Quality www.knowyoursteel.com
  7. 7. Designation Coated steel are normally designated as follows Grade of steel + coating + spangle designation + surface quality + surface treatment. Just to give an example let us consider the grade, DX53D ZF140 MBC DX53D – Deep Drawing grade (European Standard). ZF – Galvannealed 255 – Coating mass M – Mini spangle B – “B” type surface Quality C – Chemical Passivation. www.knowyoursteel.com
  8. 8. Some Additional Info  American and European Standards are most commonly used to designate the grades of coated products.  Color coated steel (Pre-painted steel) is normally on base material of GI, GL. They are designated as PPGI and PPGL. Products of GI and GL when sold without color coating or pre-painting, they are referred as “Bare” GI or “Bare GL.  Pre-painted Galvanised iron (PPGI) & Pre-painted Galvalume (PPGL). PPGL is the famous of the two. www.knowyoursteel.com
  9. 9. www.knowyoursteel.com

×