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Method for Cr-plating of mandrel bars, the mandrel bar, and process for producing seamless tubes using the method and the mandrel bar
Method for Cr-plating of mandrel bars, the mandrel bar, and process for producing seamless tubes using the method and the mandrel bar
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机译:芯棒镀铬的方法,芯棒以及使用该方法和芯棒生产无缝管的方法
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摘要
By using a plating bath containing chromic acid: 100 to 250 g/L, sulfate radical: 3.0 to 5.5 g/L, and a catalyst: 100 to 200% (a weight ratio to the chromic acid content) for conducting electroplating, a Cr-plating film which has an increased film crack density is formed on the surface of a mandrel bar base metal, whereby peeling-off of the Cr-plating film can be suppressed in mandrel mill rolling for extending the service life of the mandrel bar.
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