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Process Data set: Steel, Plate, Batch Hot Dip Galvanized, European General Galvanizers Association (en) en

Key Data Set Information
Location GB
Steel, Plate, Batch Hot Dip Galvanized, European General Galvanizers Association
Class name : Hierarchy level
  • Metsims Classification: Steel / Batch Hot Dip Galvanized Plate / Secondary
General comment on data set This EPD presents the impact of the galvanizing service for the notional steel product defined by the PCR for a sectoral EPD - a steel plate of 1m2 of 8 mm thickness. This EPD is a sectoral EPD referring to a European sample covering more than 1 million tonnes (~19%) of the production within EGGA’s membership. Data were collected from 66 companies in 14 countries for plants that were deemed highly representative of the European industry. The declared unit (the reference unit to which results are related) is set by the PCR. Data are presented for 1 year of protection of 1 m2 steel plate of 8 mm thickness.
Copyright Yes
Owner of data set
Quantitative reference
Reference flow(s)
Time representativeness
Data set valid until 2021
Time representativeness description 11/09/2021
Technological representativeness
Technology description including background system Hot dip galvanizing is one of the most popular treatments for steel corrosion protection and can be applied to a wide range of steel products that are characterised by many different dimensions, geometries and functions. The operational sequence of the plant is essentially the same and the dimension of the kettles (i.e., the bath of molten zinc) is determined by the typical mix of products to be coated. For example, small components are normally processed by companies operating smaller kettles. Galvanizing is a corrosion protection process for steel, in which the steel is coated with zinc to prevent it from rusting. The process involves dipping cleaned iron or steel components into molten zinc (which is usually at around 450°C). A series of zinc-iron alloy layers are formed by a metallurgical reaction between the iron and zinc creating a strong bond between steel and the coating. A typical time of immersion is about four or five minutes, but it can be longer for heavy articles that have high thermal inertia or where the zinc is required to penetrate internal voids. Upon withdrawal from the galvanizing bath, a layer of molten zinc will be deposited on top of the alloy layer stopping corrosion of steel in two ways - a physical barrier and electrochemical protection. Typical coating thicknesses can range from 45μm to over 200μm and in case of damaged area, a galvanic cell is formed: the zinc around the point of damage corrodes in preference to the steel and forms corrosion products that precipitate on the steel surface and protect it.
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