Steel containing super-finely dispersed oxide system inclusions

Details Steel containing super-finely dispersed oxide system inclusions Steel containing super-finely dispersed oxide system inclusions

C - Chemistry, Metallurgy

22

C

C22C 38/06 (2006.01) C22C 1/10 (2006.01) C22C 32/00 (2006.01) C22C 38/60 (2006.01)

Patent

CA 2146356

A steel comprising, by weight, not more than 1.2 % C, 0.01 to 0.10 % Al, total oxygen not more than 0.0050 %, and Mg of an amount which fulfills the relationship of the following formula (1) the rate of the number of oxide system inclusions in the steel preferably fulfills the following formula (2). (Total oxygen wt% x 0.5) ~ total Mg wt% < (total oxygen wt% x 7,0) ~~~... (1) (Number of MgO~Al2O3 + number of MgO)/number of total oxide system inclusions ~ 0.8 ~~... (2)

L'invention concerne un acier contenant jusqu'à 1,2 % en poids de C, 0,01 à 0,10 % en poids de Al, jusqu'à 0,0050 % en poids d'O et de Mg, dans des quantités satisfaisant à la relation (1): % en poids total d'oxygène x 0,05 </= % total en poids de Mg < % total en poids d'oxygène x 0,7, la proportion du nombre d'inclusion d'oxyde correspondant, de préférence, à la formule (2): (nombre de particules de MgO.Al2O3' + nombre de particules de MgO)/nombre total de particules d'inclusion d'oxyde >/= 0,8.

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