CN103525999A

CN103525999A - Preparation method of high-magnetic-induction oriented silicon steel sheet

Info

Publication number: CN103525999A
Application number: CN201310417058.1A
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 high-magnetic-induction oriented silicon steel sheet. The silicon steel sheet comprises the following elements in percentage by weight: 0.03-0.06% of C, 3.2-3.8% of Si, 0.4-0.8% of Mn, 0.015-0.025% of Als, 0.18-0.24% of Ni, 0.06-0.12% of Cr, 0.04-0.08% of Sn, 0.03-0.05% of Mo, 0.02-0.03% of Be, 0.01-0.02% of Se, 0.015-0.025% of Y, 0.02-0.03% of Ce, 0.01-0.02% of Nd, 0.005-0.01% of N, at most 0.5% of Cu, at most 0.015% of P, at most 0.005% of S and the balance of Fe. The rare-earth elements Y, Ce and Nd are added into the steel to purify the inclusions in the steel, thereby lowering the temperature in the heat treatment process and lowering the iron loss; the double cold rolling method with interannealing can improve the structure of the steel plate, enhance the recrystallization rate, and reduce and uniformize the grain size, thereby enhancing the magnetic property of the finished product.

Description

A kind of preparation method of high magnetic effect orientating-sensitive sheet

Technical field

The present invention relates to a kind of preparation method of high magnetic effect orientating-sensitive sheet, belong to ferrous metal manufacture field.

Background technology

At present, in order to reach energy-conservation and object protection of the environment, the whole world is all by focusing on orientation silicon steel production technology of paying close attention to, and high-magnetic induction, low-iron loss oriented silicon steel is the requirement that adapts to Vehicles Collected from Market.Yet because core loss value is extremely low, require alloy degree high, and normalizing temperature, finished products temperature are high, annealing atmosphere is controlled strict, and complex process is difficult to obtain high magnetic strength.

Summary of the invention

The object of the invention is to for the deficiencies in the prior art, the preparation method of a kind of high magnetic strength, low iron loss, magnetostriction is little, surface quality is good oriented silicon steel disc is provided.

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

A kind of preparation method of high magnetic effect orientating-sensitive sheet, 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 0.03-0.06, Si 3.2-3.8, Mn 0.4-0.8, Als 0.015-0.025, Ni 0.18-0.24, Cr 0.06-0.12, Sn 0.04-0.08, Mo 0.03-0.05, Be 0.02-0.03, Se 0.01-0.02, Y 0.015-0.025, Ce 0.02-0.03, Nd 0.01-0.02, N 0.005-0.01, Cu≤0.5, P≤0.015, S≤0.005, all the other are Fe, and continuous casting becomes base, strand is warming up to 480-520 ℃ with 200-250 ℃/h, insulation 3-5h, then be warming up to 850-900 ℃ with 180-220 ℃/h, insulation 2-3h, then with 120-160 ℃/h, be warming up to 1280-1350 ℃, insulation 1-2h, then being hot-rolled down to thickness is 1.5-3.0mm, hot-rolled sheet is heated to 920-980 ℃ under high pure nitrogen protection, insulation 5-10min, then with the 320-350 ℃/h 280-340 ℃ that lowers the temperature rapidly, insulation 20-30min, then with 80-120 ℃/h, be cooled to 150-170 ℃, insulation 40-50min, air cooling is cold rolling for the first time to carrying out after room temperature, is cold-rolled to after 0.5-0.7mm at 830-860 ℃ of wet type protective atmosphere P _h2O/ P _h2in=0.6-0.8, carry out decarburizing annealing, annealing time is 5-8min, and air cooling is 0.3mm to being cold-rolled to for the second time final thickness of slab after room temperature, at 650-750 ℃ of wet type protective atmosphere P _h2O/ P _h2in=0.55-0.65, carry out process annealing, annealing time is 2-4min, then be coated with annealing separating agent, at 25%N ₂+ 75%H ₂under protective atmosphere, first with 120-150 ℃/h, be warming up to 420-440 ℃, insulation 2-3h, with 40-60 ℃/h speed, be heated to 680-710 ℃ again, insulation 1-2h, with 20-30 ℃/h, be warming up to 980-1050 ℃ again, insulation 0.5-1h, is then cooled to rapidly room temperature with 200-300 ℃/min, coating, finishing gets product.

Described annealing separating agent is comprised of the raw material of following weight part: magnesium oxide 30-50, silica 1 5-20, aluminium nitride 10-15, molybdenumdisulphide 5-10, titanium oxide 8-12, sodium-chlor 12-16, wilkinite 4-9, vermiculite power 6-11, silicon carbide 5-10, graphite 4-8.

Beneficial effect of the present invention:

In molten steel of the present invention, add Y, Ce, Nd rare earth element, can purify steel inclusion, thereby reduced heat treatment process temperature, reduced iron loss; The present invention, with the secondary cold-rolling method of process annealing, can improve the weave construction of steel plate, improves recrystallize rate, reduces grain-size and even, thereby improves finished product magnetic.The features such as the siliconized plate that the present invention makes has high magnetic strength, low iron loss, magnetostriction is little, surface quality is good, can be widely used in and manufacture high-power transformer, generator and electric motor.

Embodiment

A kind of preparation method of high magnetic effect orientating-sensitive sheet, comprise the following steps: according to clean steel process, smelt, controlling the molten steel ultimate constituent and weight percent is: C 0.03-0.06, Si 3.2-3.8, Mn 0.4-0.8, Als 0.015-0.025, Ni 0.18-0.24, Cr 0.06-0.12, Sn 0.04-0.08, Mo 0.03-0.05, Be 0.02-0.03, Se 0.01-0.02, Y 0.015-0.025, Ce 0.02-0.03, Nd 0.01-0.02, N 0.005-0.01, Cu≤0.5, P≤0.015, S≤0.005, all the other are Fe, and continuous casting becomes base, strand is warming up to 510 ℃ with 250 ℃/h, insulation 4h, then be warming up to 880 ℃ with 200 ℃/h, insulation 2h, then with 160 ℃/h, be warming up to 1320 ℃, insulation 1.5h, then being hot-rolled down to thickness is 2mm, hot-rolled sheet is heated to 960 ℃ under high pure nitrogen protection, insulation 7min, then with 330 ℃/h, lower the temperature rapidly 320 ℃, insulation 30min, then with 100 ℃/h, be cooled to 160 ℃, insulation 50min, air cooling is cold rolling for the first time to carrying out after room temperature, is cold-rolled to after 0.6mm at 850 ℃ of wet type protective atmosphere P _h2O/ P _h2in=0.7, carry out decarburizing annealing, annealing time is 6min, and air cooling is 0.3mm to being cold-rolled to for the second time final thickness of slab after room temperature, at 720 ℃ of wet type protective atmosphere P _h2O/ P _h2in=0.6, carry out process annealing, annealing time is 3min, then be coated with annealing separating agent, at 25%N ₂+ 75%H ₂under protective atmosphere, first with 150 ℃/h, be warming up to 430 ℃, insulation 2h, then be heated to 705 ℃ with 50 ℃/h speed, insulation 1h, then be warming up to 1020 ℃ with 30 ℃/h, and insulation 0.5h, is then cooled to rapidly room temperature with 280 ℃/min, coating, and finishing gets product.

Described annealing separating agent is comprised of the raw material of following weight (kg): magnesium oxide 40, silica 16, aluminium nitride 12, molybdenumdisulphide 8, titanium oxide 10, sodium-chlor 14, wilkinite 6, vermiculite power 8, silicon carbide 8 graphite 6.

After testing, the magnetic of this siliconized plate is: B ₁₀=1.984T, P _17/50=0.943W/kg.

Claims

1. the preparation method of a high magnetic effect orientating-sensitive sheet, 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 0.03-0.06, Si 3.2-3.8, Mn 0.4-0.8, Als 0.015-0.025, Ni 0.18-0.24, Cr 0.06-0.12, Sn 0.04-0.08, Mo 0.03-0.05, Be 0.02-0.03, Se 0.01-0.02, Y 0.015-0.025, Ce 0.02-0.03, Nd 0.01-0.02, N 0.005-0.01, Cu≤0.5, P≤0.015, S≤0.005, all the other are Fe, and continuous casting becomes base, strand is warming up to 480-520 ℃ with 200-250 ℃/h, insulation 3-5h, then be warming up to 850-900 ℃ with 180-220 ℃/h, insulation 2-3h, then with 120-160 ℃/h, be warming up to 1280-1350 ℃, insulation 1-2h, then being hot-rolled down to thickness is 1.5-3.0mm, hot-rolled sheet is heated to 920-980 ℃ under high pure nitrogen protection, insulation 5-10min, then with the 320-350 ℃/h 280-340 ℃ that lowers the temperature rapidly, insulation 20-30min, then with 80-120 ℃/h, be cooled to 150-170 ℃, insulation 40-50min, air cooling is cold rolling for the first time to carrying out after room temperature, is cold-rolled to after 0.5-0.7mm at 830-860 ℃ of wet type protective atmosphere P _h2O/ P _h2in=0.6-0.8, carry out decarburizing annealing, annealing time is 5-8min, and air cooling is 0.3mm to being cold-rolled to for the second time final thickness of slab after room temperature, at 650-750 ℃ of wet type protective atmosphere P _h2O/ P _h2in=0.55-0.65, carry out process annealing, annealing time is 2-4min, then be coated with annealing separating agent, at 25%N ₂+ 75%H ₂under protective atmosphere, first with 120-150 ℃/h, be warming up to 420-440 ℃, insulation 2-3h, with 40-60 ℃/h speed, be heated to 680-710 ℃ again, insulation 1-2h, with 20-30 ℃/h, be warming up to 980-1050 ℃ again, insulation 0.5-1h, is then cooled to rapidly room temperature with 200-300 ℃/min, coating, finishing gets product.

2. the preparation method of high magnetic effect orientating-sensitive sheet according to claim 1, it is characterized in that, described annealing separating agent is comprised of the raw material of following weight part: magnesium oxide 30-50, silica 1 5-20, aluminium nitride 10-15, molybdenumdisulphide 5-10, titanium oxide 8-12, sodium-chlor 12-16, wilkinite 4-9, vermiculite power 6-11, silicon carbide 5-10, graphite 4-8.