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The development of color-coated board industry
In 1935, the United States established the first continuous coated steel plate line. In the past 20 years, the color-coated plate production industry has developed rapidly with the construction industry as a breakthrough, and the output has continued to increase.
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① Hot-dip galvanized steel sheet. The thin steel sheet is immersed in the molten zinc bath to make a thin steel sheet with a layer of zinc adhere to its surface. At present, it is mainly produced by continuous galvanizing process, that is, the rolled steel sheet is continuously immersed in a galvanized bath with molten zinc to make a galvanized steel sheet;
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(1)抗拉试验： ①性能指标：一般说来，只有结构用、拉伸用和深冲用镀锌板有抗拉性能要求。其中结构 用镀锌板要求有屈服点、抗拉强度和伸长率等;拉伸用只要求伸长率。具体数值见本节“8 ”中有关产品标准; ②试验方法：与一般薄钢板试验方法相同，见“8”所提供的有关标准 及“普通碳素钢薄钢板”所列的试验方法标准。 (2)弯曲试验： 弯曲试验是衡量薄板工艺性能的主要项目，但各国标准对各种镀锌板的要求并不一致，美国标准除结构级以外，其余均不要求弯曲和抗拉试验。而日本则除结构级、建筑波纹板及一般波纹板以外其余均要求作弯曲试验。 要求：一般要求镀锌板弯曲180后，外侧表面不得有锌层脱离，板基不得有龟裂及断裂。
2021-08-03
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