求翻译：本文介绍了扫描电镜的工作原理以及扫描电镜在炼钢生产中的应用。主要包括结晶器水口下部白色瘤状物分析、SPHC钢材表面裂纹分析。结果表明：水口下部白色结瘤状物为Al2O3、CaO 、MgO，其中Al2O3是水口结瘤的核心，炼钢过程中保护渣中的CaO 、MgO 以及二次氧化生成的大颗粒夹杂物，在水口Al2O3处聚集，促进了水口瘤状物的长大；SPHC钢材表面裂纹处存在复合夹杂物,是浇注过程中炉渣卷入钢水中造成的。提出了相应的预防措施，降低了SPHC钢材表面裂纹缺陷。是什么意思？

This article describes the working principle of a scanning electron microscope and scanning electron microscopy in steel production. Including mold outlet lower part of the white nodules, sphc steel surface crack analysis. The results showed that: the tilting of the outlet of the lower part white no

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This article introduced scans the electron microscope

Describes the scanning electron microscope works, as well as application of scanning electron microscope in steelmaking. Mainly includes crystalline water white in the lower mouth tumor shape analysis, analysis of the surface crack of SPHC steel. Results indicates that: water mouth lower white knot