In the laboratory, there are different kinds of sample suction and sample preparation methods. Now we give a unified introduction to the sampling and sample preparation methods of steel when the metal element analyzer tests steel:
1. Sampling and sample preparation quality of steel when metal element analyzer tests steel
The sampling method used should ensure that the analysis sample can represent the average value of the chemical composition of the melt or sampled product.
The analysis sample should have good uniformity in terms of chemical composition, and its non-uniformity should not cause a significant deviation from the analysis. However, for the sampling of the melt, there may be a deviation between the analysis method and the analysis sample. This deviation will be expressed by the reproducibility of the analysis method.
Analysis samples should remove surface coating, dehumidification, dust removal and other forms of pollution.
As far as possible, analysis samples should avoid pores, cracks, looseness, burrs, folds or other surface defects.
When sampling the melt, if an uneven or possible contamination of the sample is predicted, measures should be taken.
When cooling the sample taken from the melt, its chemical composition and metallographic structure should be kept consistent.
It is worth noting that the metallographic structure of the sample may affect the accuracy of certain physical analysis methods, especially the white and gray structure of iron, the cast and forged structure of steel.
2. Sampling and sample size of steel when metal element analyzer tests steel
The size of the block-shaped original sample should be large enough for re-examination or other analysis methods as necessary.
The quality of the prepared analytical sample should be large enough so that the necessary retest can be performed. For crumbs or powdered foreign products, the mass is generally 100g.
The size of the block analysis sample depends on the selected analysis method. For the photoelectric emission spectrum analysis and X-ray fluorescence spectrum analysis, the shape and size of the analysis sample are determined by the analysis instrument.
3. Sampling and sample preparation identification of steel when the metal element analyzer tests steel
The analysis sample should be given a unique identification so that the melt from which the sampled product is taken can be identified. If necessary, the sample processing conditions of the melt and the sampling location of the original sample or analysis sample obtained from the sampled product should be recorded.
The analysis samples of pig iron shall be given a unique identification so as to be able to identify the delivery lot or part of the delivery lot and the samples taken from the delivery lot.
4. Sampling and sample preparation of steel when the metal element analyzer tests steel
Appropriate storage equipment should be used to store the analysis samples separately. During and after the preparation of the analytical sample, the analytical sample should be protected from contamination and chemical changes.
The original samples are allowed to be stored in the form of blocks, and analysis samples are prepared when necessary.
The analysis samples or block-shaped original samples should be kept long enough to ensure the integrity of the analysis laboratory management.
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