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ISO 5002-2013 pdf free download
ISO 5002-2013 pdf free download.Hot-rolled and cold-reduced electrolytic zinc-coated carbon steel sheet of commercial and drawing qualities
Tôles en acier au carbone larninées a chaud et àfroid, revêtues par zin gage électrolytique (tôles électro-zinguées) de qualité corn merciale et pour emboutissage.
Strain ageing can be caused by either carbon or nitrogen atoms, which exist in a supersaturated solid solution and diffuse to dislocation sites with time and temperature. The addition of aluminium in sufficient quantities causes the removal of nitrogen from solid solution as particles of aluminium nitride. This practice tends to minimize room temperature ageing due to nitrogen and results in the general understanding that cold-rolled aluminium killed steel is free of ageing concerns generally associated with CR4. However, carbon, which is usually not retained in solid solution with the slow cooling typical of batch annealing, can be retained in solid solution during the continuous annealing process. If the annealing process and steel chemistry are not properly controlled, material with carbon remaining in solid solution after continuous annealing may result and such material will strain age at room temperature and the problems noted above can occur. Chemical stabilization, as with CR5, prevents this problem, as does proper processing with CR4 material.
Because of these factors, it is essential that the period between final processing at the mill and fabrication be kept to a minimum. Rotation of stock, by using the oldest material first, Is Important. Stocking of such steels for extended periods of time should be avoided.
For skin-passed sheet, effective roller leveling immediately prior to fabrication at the manufacturer’s plant can achieve reasonable freedom from stretcher strain. Freedom from stretcher strain for a period of 6 months can be achieved by the supply of skin-passed non-ageing steel. Grade CR4 or CR5 should be specified in such cases where Luders lines are not acceptable and where roller leveling Is not possible.
5.10 Surface treatment of electrolytic zinc-coated products
The requirements for solutions used in surface treatments for paint preparation, surface passivation, or both should be agreed upon between the interested parties at the time of ordering, taking into consideration the user’s paint schedule and paint systems.
5.10.2 Surface preparation for painting
Electrolytic zinc-coated steel sheet may be processed chemically (such as phosphating or other suitable methods) at the manufacturer’s mill to prepare the sheet for painting without further treatment, except normal cleaning, if required.
5.10.3 Mill passivation
A chemical treatment is normally applied to zinc coating to minimize the hazard of wet storage stain (white rust) during shipment and storage. The type of chemical treatment may be agreed upon between the manufacturer and the purchaser. However, the inhibiting characteristics of the treatment are limited and, if the material becomes wet during shipment or storage, the material should be used immediately or dried.ISO 5002-2013 pdf free download.
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