Improvement in galvannealed coating of IF-HS steel strips by combined GDOES and colour-etching method |
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Authors: | Subhankar Das Bakshi Monojit Dutta N Rajesh |
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Affiliation: | a Research and Development Division, Tata Steel Limited, Jamshedpur, Jharkhand Pin-831001, India b Cold Rolling Mill, Tata Steel Limited, Jamshedpur-831001, India |
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Abstract: | Galvannealed coating of high strength interstitial free (IF-HS) steel was characterised by Glow Discharge Optical Emission Spectroscopy (GDOES) and colour-etching techniques. Overalloyed galvannealed coatings with considerably high amount of Γ and Γ1 phases were detected in the first set of experiments. Necessary process modifications in galvannealing furnace were made to maximise the ä phase in the galvannealed coating, which was confirmed through GDOES and colour-etching techniques. As a result, an improvement in galvannealed product quality with a better powdering resistance property during forming has been achieved. |
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Keywords: | Glow discharge optical emission spectroscopy (GDOES) Colour etching Zinc alloy Galvannealing |
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