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材质不明,又不允许在钢材上钻孔取样,这种情况下如何镒定钢材的化学成份呢?我们遇到过要区分钢屋架构件是 A_3普通炭素结构钢还是16Mn 低合金结构钢的难题。在铁塔制造、电站钢架结构及其他金属结构的制造检修时,也会遇到类似的情况。如何办呢?用砂轮打磨,想从火花上鉴别,看不清楚。以后我们试验用无屑点滴化验的办法,手续简便,效果可靠,证明是可行的。无屑点滴化验的原理是:Mn~(++)是浅红色。用铋酸钠(NaBiO_3)氧化为 MnO_4,显得很深紫
How to determine the chemical composition of steel in this case? We have encountered to distinguish between steel truss member is A_3 ordinary carbon structural steel or 16Mn low-alloy structural steel problems . In the tower manufacturing, power station steel structure and other metal structures manufacturing and maintenance, will also encounter a similar situation. How to do it? With grinding wheel, want to identify from the spark, can not see clearly. After the test we use no crumb assay, simple procedure, the effect is reliable, it is proved feasible. The principle of non-chip drip test is: Mn ~ (++) is light red. With sodium bismuth (NaBiO_3) is oxidized to MnO_4, it is very dark purple