Study on Micro-inclusions Behavior of Beam Blanks
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摘要:
对采用半敞开方式浇铸的H型钢中显微夹杂物的类型、数量、尺寸以及分布情况进行研究,并通过示踪剂追踪分析了钢中夹杂物的来源。试验结果表明:铸坯内T[O]平均为70.8×10-6,显微夹杂总体积率为0.15%,主要分为球形硅钙酸盐夹杂、块状硅铝酸盐夹杂、球状硫化钙夹杂三类。其中前两类占夹杂总量的89.7%,为多元素的复合氧化物,两者的化学成分比较接近,区别主要在于Al、Ca含量;第三类占10.3%,该类夹杂含S较高。夹杂物主要为小于10μm的显微夹杂,它的分布特点决定了连铸坯中夹杂物的分布特点。
Abstract:The type, magnitude, size and distribution of non-metallic inclusions in beam blanks were researched via systemic sampling and adopting metallographic analysis and SEM/EDS, and the origin of inclusions in H beam was analyzed through method of tracer.The result show that the average of T[O] is 70.8×10-6, the volume ratio of micro-inclusions is 0.15%.Micro-inclusions mainly have three kinds: A, B and C, the total micro-inclusions contain 89.7% of A and B, the chemic elements of A and B are similar, the main difference of A and B is that they have different amount of Al, Ca.And C holds 10.3% in the micro inclusions, which has high content of S.The inclusions'size is mostly less than 10 μm.The distribution trait of inclusions in slab is mainly decided by them.
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Key words:
- H-beam /
- near net shape casting /
- beam blank /
- micro-inclusions /
- tracer method /
- volume ratio
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