The existence of hard inclusion may cause a great influence to variations of earthquake precursors.
硬包体的存在对地震前兆变化会产生显著影响。
The results show that the pre-hardened plastic-mould steel belongs to a little low machinability steel because of much hard inclusion existing in microstructure and its high strength and hardness.
结果表明，这类材料属较难加工材料，这主要是由于钢中存在大量硬质点，且材料具有较高强度和硬度所致。
The amount, size and distribution of non-metallic inclusion in different positions of hard wire steel with different diameters were investigated by optical microanalysis.
采用光学显微分析法在不同直径硬线钢的不同部位，分析了非金属夹杂物的数量、大小和分布特征。
The amount, size and distribution of non-metallic inclusion in different positions of hard wire steel with different diameters were investigated by optical microanalysis.
采用光学显微分析法在不同直径硬线钢的不同部位，分析了非金属夹杂物的数量、大小和分布特征。
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