Abstract Ingot steel for use in producing a single-oriented silicon steel sheet having a high magnetic induction, the steel being a silicon steel containing less than 0.085% C, 1-3.5% Si, up to 0.060% S, 0.02 to 0.945% acid-soluble Al and at least one element selected from the group consisting of 0.007 to 0.30% Se, 0.077 to 0.20% Te and the rest being Fe. The ingot steel is hot-rolled to form a steel sheet, the hot-rolled steel sheet is subjected to an annealing for precipitating AlN in a temperature range of 850* to 1,200*C when Si is present in an amount of from 1 to 2.5%, and at a temperature range of 960* to 1,200*C when Si is present in an amount of 2.5 to 4%, the annealing being for a time of 30 seconds to 30 minutes. The annealed sheet is cold-rolled to obtain a steel sheet of final thickness, the cold-rolling being at a reduction rate of 60 to 95% when there is a single cold-rolling step, and when there is a plurality of cold-rolling steps the final cold-rolling step is at a reduction rate of 60 to 95%. The final steel sheet has a B10 value of over 19,100 gauss.
A PROCESS FOR PRODUCING A SINGLE-ORIENTED SILICON STEEL SHEET HAVING A MAGNETIC INDUCTION VALUE ABOVE 19,100 GAUSS CONSISTING ESSENTIALLY OF: A. HOT-ROLLING A SILICON STEEL INGOT CONSISTING ESSENTIALLY OF 0.015% TO 0.085% C, 1-3.5% SI, WITH THE PROVISO THAT 06 WHEN SI IS PRESENT IN AN AMOUNT OF 1-2.5% C IS PRESENT BETWEEN 0.015% AND 0.085% AND WHEN SI IS PRESENT IN AN AMOUNT OF 2.5-3.5%, C IS PRESENT IN AN AMOUNT BETWEEN 0.025% AND 0.085%; S IN AN AMOUNT UP TO 0.060%, 0.02 TO 0.045% ACID SOLUBLE AL, AND AT LEAST ONE ELEMENT SELECTED FROM THE GROUP CONSISTING OF 0.007 TO 0.30% SE AND 0.007 TO 0.20% TE, MORE THAN ABOUT 0.004% N AND THE REST BEING FE TO PRODUCE A HOT-ROLLED STEEL SHEET; B. ANNEALING THE HOT-ROLLED STEEL SHEET TO PRECIPITATE AIN AT A TEMPERATURE RANGE OF 850* TO 1,200*C WHEN SI IS PRESENT IN AN AMOUNT OF FROM 1 TO 2.5%, AND AT A TEMPERATURE RANGE OF 960* TO 1,200*C WHEN SI IS PRESENT IN AN AMOUNT OF FROM 2.5 TO 3.5%, THE ANNEALING BEING CARRIED OUT FOR A TIME OF 30 SECONDS TO 30 MINUTES AND C. COLD-ROLLING THE THUS-ANNEALED STEEL SHEET TO OBTAIN A STEEL SHEET OF FINAL THICKNESS, THE COLD-ROLLING BEING EFFECTED AT A REDUCTION RATE OF 60% TO 95% WHEN THEREIN IS A SINGLE COLD-ROLLING STEP AND WHEN THERE IS A PLURALITY OF COLDROLLING STEPS, THE FINAL COLD-ROLLING STEP BEING CARRIED OUT AT A REDUCTION RATE OF 60 TO 95%.
Claim 2
Dependent Claim
247 words
A PROCESS FOR PRODUCING A SINGLE-ORIENTED SILICON STEEL SHEET HAVING A MAGNETIC INDUCTION VALUE ABOVE 19,100 GAUSS CONSISTING ESSENTIALLY OF: A. HOT-ROLLING A SILICON STEEL INGOT CONSISTING ESSENTIALLY OF 0.015% TO 0.085% C, 1-3.5% SI, WITH THE PROVISO THAT 06 WHEN SI IS PRESENT IN AN AMOUNT OF 1-2.5% C IS PRESENT BETWEEN 0.015% AND 0.085% AND WHEN SI IS PRESENT IN AN AMOUNT OF 2.5-3.5%, C IS PRESENT IN AN AMOUNT BETWEEN 0.025% AND 0.085%; S IN AN AMOUNT UP TO 0.060%, 0.02 TO 0.045% ACID SOLUBLE AL, AND AT LEAST ONE ELEMENT SELECTED FROM THE GROUP CONSISTING OF 0.007 TO 0.30% SE AND 0.007 TO 0.20% TE, MORE THAN ABOUT 0.004% N AND THE REST BEING FE TO PRODUCE A HOT-ROLLED STEEL SHEET; B. ANNEALING THE HOT-ROLLED STEEL SHEET TO PRECIPITATE AIN AT A TEMPERATURE RANGE OF 850* TO 1,200*C WHEN SI IS PRESENT IN AN AMOUNT OF FROM 1 TO 2.5%, AND AT A TEMPERATURE RANGE OF 960* TO 1,200*C WHEN SI IS PRESENT IN AN AMOUNT OF FROM 2.5 TO 3.5%, THE ANNEALING BEING CARRIED OUT FOR A TIME OF 30 SECONDS TO 30 MINUTES AND C. COLD-ROLLING THE THUS-ANNEALED STEEL SHEET TO OBTAIN A STEEL SHEET OF FINAL THICKNESS, THE COLD-ROLLING BEING EFFECTED AT A REDUCTION RATE OF 60% TO 95% WHEN THEREIN IS A SINGLE COLD-ROLLING STEP AND WHEN THERE IS A PLURALITY OF COLDROLLING STEPS, THE FINAL COLD-ROLLING STEP BEING CARRIED OUT AT A REDUCTION RATE OF 60 TO 95%.
Claim 3
Dependent Claim
22 words
The method claimed in claim 1 in which the silicon steel sheet contains 0.007 to 0.30% Se and 0.007 to 0.20% Te.