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天津如何快速识别不锈钢冲孔板真假

作者:【admin】 来源:【原创】 发表时间:【2016-04-22 16:47:34】 浏览:【次】

  几种让您快速识别不锈钢冲孔板方法,希望对您有所帮助。红升冲孔网厂小编把测试方法分成四种!

  一:硝酸点试验不锈钢冲孔板的一个显著特点是对浓硝酸和稀硝酸具有固有的耐蚀性。这种性能使其能很容易地从大多数其他金属或合金中加以区分。但高碳型420和440钢在进行硝酸点试验时则稍受腐蚀,有色金属遇到浓硝酸时立即会被腐蚀。而稀硝酸对碳钢具有强烈的腐蚀性!

  二:不锈钢是非磁性钢,但经大压下冷加工后将具有轻度的磁性;而纯粹的铬钢和低合金钢都是强磁性钢。磁性试验磁性试验是区别退火不锈钢与铁素体不锈钢管的最简单的方法。

  三:硫酸试验硫酸浸没不锈钢管试验能把302和304与316和317区分开来。试样的切边应经过细磨,然后在体积浓度为20~30%、温度为60~66℃的硝酸(比重为1.42)中清洗和钝化半小时。硫酸试验溶液的体积浓度为10%,加热到71℃当.302和304钢浸入这种热溶液中时,被迅速腐蚀并产生大量气泡,试样在几分钟内变黑;而316和317钢的试样则不受腐蚀或反应很慢(不产生气泡),试样在10~15分钟内不变色。如果采用同时试验具有已知成分的试样来进行近似比较的话,可使试验更为准确。

  四:硫酸铜点试验硫酸铜点试验是快速区分普通碳素钢和所有类型的不锈钢的最简便方法。所使用的硫酸铜溶液的浓度为5~10%。在进行点试验前,试验区应彻底清除油脂或各种杂质,并用软磨布磨光一个小区域,然后再用滴瓶向清理后的区域滴注硫酸铜溶液。普通碳素钢或铁在几秒钟内就会形成一层表面金属铜,而不锈钢的表面则不产生铜沉淀或显示铜的颜色。


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