The sheet or strip steel of superior strength, and TWIP properties, and process for its manufacture by means of 'direct strip casting.

摘要

The sheet or strip steel of superior strength, and TWIP properties, and process for its manufacture by means of direct strip casting.The present invention relates to a process for the manufacture of strips or sheets of deformable steel cold, superior resistance, with properties TWIP, where work steps that follow one another without interruption, a melt of the composition (% by weight): C: 0003 - 1,5%, Mn: 9 - 30.00%, Ni: 243 10%, Si: 243 8.00%, al: 243 10%, Cr: 243 10%, N: 243 0.60%.Cu: 243 3,00%, P: 243 0.40%, 5: 243 0,15%, optionally one or more elements of the group, t, V, Ti, B, BN, REM, Mo, W, Co, CA, and Mg, with the condition that the sum of the contents if you are 243 0.25%, the sum of the contents of V, Ti, Nb, B, R is 243 4.00%, the sum of the contents of Mo. W, CO is 243 1.50% and the sum of the contents of Ca, Mg is 243 0.50%.Moreover, as well as containing iron impurities conditioned by fusion, and the levels of Sn, Sb, Zr, Ta, and whose sum does not exceed 0,30%, these impurities are added, is applied on a conveyor belt and cooled to compress to a pre - tape, the tape is pre O.D. Aida of the conveyor belt, the pre - tape extracted if necessary, is subjected to a heat treatment.The pre - tape is hot rolled to a final temperature of the hot lamination matter in at least 700 198 C for a hot band texture with a completely recristalizada, and the hot tape is coiled at a temperature of winding and up to 750 198 C.