キルド鋼厚板に現われる或る種の表面疵の成因について

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The surface quality of very heavy plates which ranged from about 16 to 150 mm in thickness and were rolled from 4 to 80 ton carbon steel ingots after along soaking time, was frequently spoiled due to the appearance of certain check patterns, the cause of which hitherto had been remained rather unknown. The authors investigated this kind of surface defects statistically and some experimental supplementary data were obtained as follows : 1) Under ordinary operations of soaking pit, the surface defects became more remarkable with the soaking time. 2) Variation of defects between charges was less than those within them. 3) No definite relation between the defects and ingot-moulding practice was found. 4) Surface-layer concentration of impurities such as nikel, copper and arsenic by salected oxidation was caused in most cases in ingots or billets after the ordinary soaking time. 5) Micro-examination along the surface-layer of soaked ingots or billets revealed sometimes decarbonization, intergranular penetration of scaling and oxidized inclusions, whilst Charpy specimens which had been taken from those surface and banded at 700∿1300℃ showed a surface cracking especially at 900∿1100℃. 6) Specimens added with about 1% Cu and As respectively did not show such surface cracking as that in the above bending test. From these results, the cause of this surface defects was presumed to be an embrittled surface-layer by oxygen increase during a long time heating.
社団法人日本鉄鋼協会の論文
1954-04-25

キルド鋼厚板に現われる或る種の表面疵の成因について

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