Analysis on Forming Reasons and Improvement Measures of Crack Defects on Bars
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摘要: 裂纹是棒材产品中常见的缺陷,引起裂纹缺陷的原因很多,采用光学显微镜、SEM扫描电镜及EDS能谱仪等实验手段,对棒材产品中裂纹缺陷的成因进行分析研究。结果表明:引起棒材产品裂纹的原因分为四种:棒材基体内存在大量非金属夹杂物、表面脱碳、带状组织和硫化物夹杂。针对上述几种原因,通过优化炼钢、连铸工艺,电磁搅拌技术和脱硫工艺等措施,大大提高了棒材的成材率。Abstract: Crack defects are commonly found on the steel bar products and caused by many factors.Analysis on the causes of the crack defect of bar products by means of the optical microscopy,scanning electron microscopy(SEM) and energy dispersive spectrum(EDS).It is found out that factors causing crack defects can be divided into four kinds:bar matrix in the presence of a large number of non metallic inclusions,surface decarburization,banded structure and sulfide inclusions.Therefore,the countermeasures have been developed through the optimization of steelmaking,continuous casting,electromagnetic stirring and desulfurization technology,and lead to a great increase in the yield rate of the finished products.
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Key words:
- bar /
- crack /
- inclusion /
- banded structure /
- decarburization /
- sulfide inclusions
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