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| AN INVESTIGATION OF GHOST LINES IN A LOW-ALLOY STEEL |
| HO TSEN-CHIAN;CHEN CHI-TSE;FUNG MUN-CHU;CHU YUAN-TEI Institute of Metal Research; Academia Sinica |
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Cite this article:
HO TSEN-CHIAN;CHEN CHI-TSE;FUNG MUN-CHU;CHU YUAN-TEI Institute of Metal Research; Academia Sinica. AN INVESTIGATION OF GHOST LINES IN A LOW-ALLOY STEEL. Acta Metall Sin, 1959, 4(2): 114-126.
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Abstract Under the works condition, ghost lines in the billets of a low-alloy structural steel, 30 Cr Mn Si,made in basic electric arc furnace were investigated. A statistical analysis of the production datashows that there exists a linear relationship between the average length of ghost lines and the sizeof billets, i. e., after ingots of a given size being forged, the smaller the diameter of billets, thelonger the ghost lines. For ingots of 340×340 millimeter top size, after being forged into billetsof 60 to 70 millimeter diameter, the probability of the occurance of ghost lines appears to be maxi-mum. Meanwhile, it was also observed that the different parts of the ingots have bearing uponthe formation of ghost lines. Ghost lines usually originated from the kind of chain-type non-metallic inclusions, such asspinel of iron and aluminum oxides (Al_2O_3·FeO) and mixture of the spinel and corundum(Al_2O_3·FeO; Al_2O_3). Results of works experiments show that by means of the improvement ofdeoxidation, the adoption of an optimum degree of forgeability and the removal of the surfacelayer of ingots at certain stage during forgoing, ghost lines in billets can be greatly reduced orcompletely removed.
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Received: 18 February 1959
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[1] З. М. Калинина; Сопоставление, 1957年3月.
[2] В. Д. Трофимчук; 1954年版.
[3] С. М. Гнучев и З. М. Калинина; 1953年11月.& |
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