The steel sample is molten by radio freguency induction heating in pure nitrogen flow.
试样在高纯氮气流中用高频感应加热熔融。
The carbon steel sample is coated with a uniform dense ceramic layer by chemical reaction method.
采用化学反应法，在普通碳素钢上涂覆一层均匀致密的陶瓷涂层。
In photoelectric spectral analysis for a steel sample, the result depends on the condition of sample surface.
在对钢样进行光电光谱分析时，其表面情况对分析结果有直接影响。
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