CN103526000A

CN103526000A - Preparation method of low-carbon high-manganese oriented silicon steel sheet

Info

Publication number: CN103526000A
Application number: CN201310417217.8A
Authority: CN
Inventors: 任振州
Original assignee: Individual
Current assignee: Individual
Priority date: 2013-09-13
Filing date: 2013-09-13
Publication date: 2014-01-22

Abstract

The invention discloses a preparation method of a low-carbon high-manganese oriented silicon steel sheet. The silicon steel sheet comprises the following elemets in percentage by weight: at most 0.003% of C, 2.0-2.5% of Si, 1.6-2.2% of Mn, 0.008-0.014% of Als, 0.3-0.5% of Cu, 0.15-0.25% of Sb, 0.05-0.08% of Zr, 0.03-0.06% of Nb, 0.02-0.03% of Ti, 0.01-0.02% of Bi, 0.006-0.012% of Sr, 0.002-0.004% of B, 0.01-0.015% of La, 0.008-0.012% of Pr, 0.005-0.01% of Lu, at most 0.0025% of N, at most 0.05% of P, at most 0.005% of S and the balance of Fe. The C content is lowered, and the Mn content is enhanced, thereby improving the plasticity of the casting blank, hot-rolled plate and cold-rolled plate, reducing the cracks and ruptures formed in the processing, enhancing the yield, reducing the decarburization amount of recrystallization, lowering the consumption and enhancing the production efficiency.

Description

A kind of preparation method of low-carbon high-manganese oriented siliconized plate

Technical field

The present invention relates to a kind of preparation method of low-carbon high-manganese oriented siliconized plate, belong to ferrous metal manufacture field.

Background technology

At present, oriented silicon steel is in process of production in order to effectively reduce finished product iron loss, process annealing temperature or finished products temperature while improving Hot Rolled Plate Normalizing temperature, secondary cold-rolling, but normalizing temperature or process annealing excess Temperature can cause steel plate excessively crisp, cold rolling performance worsens, lumber recovery reduces, and cost raises; Finished products excess Temperature not only to furnace equipment particularly furnace bottom roll etc. require very highly, and easily cause finished steel plate surface oxidation.

Summary of the invention

The object of the present invention is to provide that a kind of normalizing temperature, process annealing temperature and final high temperature anneal temperature are low, the preparation method of once cold rolling, iron loss is low, lumber recovery is high, surface quality is good, cost is low low-carbon high-manganese oriented siliconized plate.

The technical solution used in the present invention is as follows:

A kind of preparation method of low-carbon high-manganese oriented siliconized plate, it is characterized in that, comprise the following steps: according to clean steel process, smelt, controlling the molten steel ultimate constituent and weight percent is: C≤0.003, Si 2.0-2.5, Mn 1.6-2.2, Als 0.008-0.014, Cu 0.3-0.5, Sb 0.15-0.25, Zr 0.05-0.08, Nb 0.03-0.06, Ti 0.02-0.03, Bi 0.01-0.02, Sr 0.006-0.012, B 0.002-0.004, La 0.01-0.015, Pr 0.008-0.012, Lu 0.005-0.01, N≤0.0025, P≤0.05, S≤0.005, all the other are Fe, and continuous casting becomes base, strand is heated to 1150-1250 ℃, and insulation 0.5-1h, then carries out hot rolling, 820-860 ℃ of finish to gauge, 500-550 ℃ is batched, and after having batched, with 100-120 ℃/h, is cooled to 320-350 ℃, insulation 1-2h, then with 70-80 ℃/h, be cooled to 160-180 ℃, insulation 3-4h, air cooling is warming up to 240-280 ℃ with 80-100 ℃/h to room temperature, insulation 0.5-1h, then with 150-180 ℃/h, be warming up to 580-600 ℃, insulation 20-30min, with 90-110 ℃/h, be warming up to 820-860 ℃ again, insulation 3-5min, after pickling, carrying out cold rollingly, is the 25%N of-20～-25 ℃ at dew point by cold-reduced sheet ₂+ 75%H ₂in atmosphere, to be greater than the speed of 300 ℃/min, to be rapidly heated 910-930 ℃ and to carry out primary recrystallization annealing, annealing time is 1-2min, then with 200-250 ℃/h, be cooled to 420-460 ℃, insulation 0.5-1h, with 130-160 ℃/h, be cooled to 150-180 ℃ again, insulation 2-3h, air cooling to electrostatic method after room temperature is coated with Al ₂o ₃, at 75%N ₂+ 25H ₂in atmosphere, carry out secondary recrystallization annealing at 880-900 ℃ temperature, annealing time is 18-24h, then at 100%H ₂in atmosphere, be warmed up to 950-1000 ℃ and purify annealing, annealing time 18-24h, air cooling, coating, finishing get product.

Beneficial effect of the present invention:

The present invention, by reducing the content of C, the content of raising Mn, not only can improve the plasticity of strand, hot-rolled sheet, cold-reduced sheet, reduces the crackle and the fracture that are processed to form, improve lumber recovery, can also reduce the decarburized amount of recrystallize, reduce and consume, enhance productivity; The feature that the present invention also utilizes La, Pr, Lu rare earth element to purify inclusion in steel reduces heat treatment process temperature, adopts lower normalizing temperature, process annealing temperature and finished products temperature can obtain the siliconized plate that iron loss is lower.

Embodiment

a kind of preparation method of low-carbon high-manganese oriented siliconized plate, comprise the following steps: according to clean steel process, smelt, controlling the molten steel ultimate constituent and weight percent is: C≤0.003, Si 2.0-2.5, Mn 1.6-2.2, Als 0.008-0.014, Cu 0.3-0.5, Sb 0.15-0.25, Zr 0.05-0.08, Nb 0.03-0.06, Ti 0.02-0.03, Bi 0.01-0.02, Sr 0.006-0.012, B 0.002-0.004, La 0.01-0.015, Pr 0.008-0.012, Lu 0.005-0.01, N≤0.0025, P≤0.05, S≤0.005, all the other are Fe, and continuous casting becomes base, strand is heated to 1200 ℃, and insulation 0.5h, then carries out hot rolling, 840 ℃ of finish to gauges, 520 ℃ are batched, and after having batched, with 120 ℃/h, are cooled to 320 ℃, insulation 2h, then with 80 ℃/h, be cooled to 160 ℃, insulation 4h, air cooling is warming up to 270 ℃ with 100 ℃/h to room temperature, insulation 0.5h, then with 160 ℃/h, be warming up to 600 ℃, insulation 20min, with 110 ℃/h, be warming up to 850 ℃ again, insulation 3min, after pickling, carrying out cold rollingly, is the 25%N of-25 ℃ at dew point by cold-reduced sheet ₂+ 75%H ₂in atmosphere, with the speed of 350 ℃/min, be rapidly heated 920 ℃ and carry out primary recrystallization annealing, annealing time is 2min, then with 240 ℃/h, is cooled to 430 ℃, insulation 1h, then be cooled to 160 ℃ with 150 ℃/h, and insulation 3h, air cooling to electrostatic method after room temperature is coated with Al ₂o ₃, at 75%N ₂+ 25H ₂in atmosphere, carry out secondary recrystallization annealing at 880 ℃ of temperature, annealing time is 24h, then at 100%H ₂in atmosphere, be warmed up to 980 ℃ and purify annealing, annealing time 24h, air cooling, coating, finishing get product.

After testing, the magnetic of this siliconized plate is: B ₁₀=1.924T, P _17/50=1.032W/kg.

Claims

1. the preparation method of a low-carbon high-manganese oriented siliconized plate, it is characterized in that, comprise the following steps: according to clean steel process, smelt, controlling the molten steel ultimate constituent and weight percent is: C≤0.003, Si 2.0-2.5, Mn 1.6-2.2, Als 0.008-0.014, Cu 0.3-0.5, Sb 0.15-0.25, Zr 0.05-0.08, Nb 0.03-0.06, Ti 0.02-0.03, Bi 0.01-0.02, Sr 0.006-0.012, B 0.002-0.004, La 0.01-0.015, Pr 0.008-0.012, Lu 0.005-0.01, N≤0.0025, P≤0.05, S≤0.005, all the other are Fe, and continuous casting becomes base, strand is heated to 1150-1250 ℃, and insulation 0.5-1h, then carries out hot rolling, 820-860 ℃ of finish to gauge, 500-550 ℃ is batched, and after having batched, with 100-120 ℃/h, is cooled to 320-350 ℃, insulation 1-2h, then with 70-80 ℃/h, be cooled to 160-180 ℃, insulation 3-4h, air cooling is warming up to 240-280 ℃ with 80-100 ℃/h to room temperature, insulation 0.5-1h, then with 150-180 ℃/h, be warming up to 580-600 ℃, insulation 20-30min, with 90-110 ℃/h, be warming up to 820-860 ℃ again, insulation 3-5min, after pickling, carrying out cold rollingly, is the 25%N of-20～-25 ℃ at dew point by cold-reduced sheet ₂+ 75%H ₂in atmosphere, to be greater than the speed of 300 ℃/min, to be rapidly heated 910-930 ℃ and to carry out primary recrystallization annealing, annealing time is 1-2min, then with 200-250 ℃/h, be cooled to 420-460 ℃, insulation 0.5-1h, with 130-160 ℃/h, be cooled to 150-180 ℃ again, insulation 2-3h, air cooling to electrostatic method after room temperature is coated with Al ₂o ₃, at 75%N ₂+ 25H ₂in atmosphere, carry out secondary recrystallization annealing at 880-900 ℃ temperature, annealing time is 18-24h, then at 100%H ₂in atmosphere, be warmed up to 950-1000 ℃ and purify annealing, annealing time 18-24h, air cooling, coating, finishing get product.