FIELD: metallurgy.
SUBSTANCE: method includes continuous etching of hot-rolled strips in hydrochloric acid, rolling and coating. The main etching defects (metal under-etching and over-etching) are prevented and required steel quality is ensured, when etching is performed at regenerating acid concentrations supplied to etching tanks equal to 185-205 g/l. The strips moving velocity during etching process does not exceed 2 m/s. At the same time, the rolling on double-stand rolling mill is conducted in rolls having rough surface measured between Ra=2.0…2.5 mcm. The metal is exposed to pinch-pass rolling in rolls having roughness degree between Ra=3.5…6.5 mcm before it is coated in continuous hot galvanising facility.
EFFECT: improved consumer properties of cold-rolled galvanised auto metal sheet.
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| Title | Year | Author | Number |
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