Glossary of CR, GLM, GA, GI, PO Steel Coils
Cold
Rolled Steel(CR):
Flat rolled steel products for which the final required thickness has been obtained by rolling base hot rolled pickled substrate at room temperature. This is accomplished by passing the steel through work rolls under tremendous pressure which tightens thickness tolerances, improves shape and surface quality. The initial product coming through the work rolls is called Cold Rolled Full Hard and from there the coils will need to be Annealed in order to become fully processed Cold Rolled Steel.
Galvalume (GLM):
Sheet steel is coated with aluminum-zinc alloy using the continuous hot-dipped process similar to the process used to make galvanized steel. The nominal coating composition is 55% aluminum and 45% zinc. Galvalume has superior corrosion resistance which is achieved by the intricate microscopic formation of zinc-rich and aluminum-rich zones within the coating. The aluminum provides long-term durability and zinc the corrosion protection. Galvalume is a registered trademark of BIEC International and you will find it under other names when produced by non-BIEC production facilities.
Galvanized (GI or GALV):
Carbon steel substrate – either Cold Rolled or Hot Rolled Pickled (normally dry) – which has zinc applied to both sides. The zinc is applied as the substrate passes through a molten zinc bath and then is quickly dried. The process results in a layer of zinc tightly adhering to the base steel through an iron-zinc bonding layer. Zinc is applied to the steel for applications where corrosion resistance is important.
Galvannealed (GN or GA):
Carbon steel substrate which goes through the hot-dipped galvanized process. Immediately after exiting the molten zinc bath the strip enters a heat zone (Galvannealed rig) which converts the entire coating to a zinc-alloy layer. Galvannealed is usually gray in color and the surface is exceptional for post-paint applications (Chrysler and a number of foreign car manufacturers use it for the automotive skins).
Pickled & Oiled (PO)
Process of removing scale and rust from the surface of hot rolled steel using hydrochloric acid baths. Usually after the Pickling process is complete the steel is cleaned and then oiled to protect the steel from rusting quickly – this is called Hot Rolled Pickled & Oiled (HRPO). If the steel is going to a galvanizing facility it normally is produced dry (HRPD).
Flat rolled steel products for which the final required thickness has been obtained by rolling base hot rolled pickled substrate at room temperature. This is accomplished by passing the steel through work rolls under tremendous pressure which tightens thickness tolerances, improves shape and surface quality. The initial product coming through the work rolls is called Cold Rolled Full Hard and from there the coils will need to be Annealed in order to become fully processed Cold Rolled Steel.
Galvalume (GLM):
Sheet steel is coated with aluminum-zinc alloy using the continuous hot-dipped process similar to the process used to make galvanized steel. The nominal coating composition is 55% aluminum and 45% zinc. Galvalume has superior corrosion resistance which is achieved by the intricate microscopic formation of zinc-rich and aluminum-rich zones within the coating. The aluminum provides long-term durability and zinc the corrosion protection. Galvalume is a registered trademark of BIEC International and you will find it under other names when produced by non-BIEC production facilities.
Galvanized (GI or GALV):
Carbon steel substrate – either Cold Rolled or Hot Rolled Pickled (normally dry) – which has zinc applied to both sides. The zinc is applied as the substrate passes through a molten zinc bath and then is quickly dried. The process results in a layer of zinc tightly adhering to the base steel through an iron-zinc bonding layer. Zinc is applied to the steel for applications where corrosion resistance is important.
Galvannealed (GN or GA):
Carbon steel substrate which goes through the hot-dipped galvanized process. Immediately after exiting the molten zinc bath the strip enters a heat zone (Galvannealed rig) which converts the entire coating to a zinc-alloy layer. Galvannealed is usually gray in color and the surface is exceptional for post-paint applications (Chrysler and a number of foreign car manufacturers use it for the automotive skins).
Pickled & Oiled (PO)
Process of removing scale and rust from the surface of hot rolled steel using hydrochloric acid baths. Usually after the Pickling process is complete the steel is cleaned and then oiled to protect the steel from rusting quickly – this is called Hot Rolled Pickled & Oiled (HRPO). If the steel is going to a galvanizing facility it normally is produced dry (HRPD).
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