CN102140607A

CN102140607A - Method for manufacturing hot rolled {111}(112) oriented high-silicon steel plates

Info

Publication number: CN102140607A
Application number: CN 201110064613
Authority: CN
Inventors: 林均品; 房现石; 梁永锋; 叶丰; 陈国良; 张来启; 郝国建
Original assignee: University of Science and Technology Beijing USTB
Current assignee: University of Science and Technology Beijing USTB
Priority date: 2011-03-17
Filing date: 2011-03-17
Publication date: 2011-08-03
Anticipated expiration: 2031-03-17
Also published as: CN102140607B

Abstract

The invention discloses a method for manufacturing hot rolled {111}(112) oriented high-silicon steel plates, and belongs to the field of metal materials. The high silicon steel comprises the following chemical compositions in percentage by weight: 4.0 to 9.0 percent of Si, 0 to 0.1 percent of B, 0.01 to 0.08 percent of Mn, 0.010 to 0.02 percent of S, 0.010 to 0.020 percent of P, 0.020 to 0.045 percent of C, 0.0040 to 0.010 percent of Al and the balance of Fe and inevitable inclusions. In the method, oriented high-silicon steel plate blanks with the thickness of 3-25mm growing in the (100) direction, which are prepared by a directional solidification technology, are subjected to hot rolling; the opening rolling temperature is 1,050 to 1,310 DEG C and the finishing rolling temperature is 550 to 850 DEG C; the percentage reduction of the first pass is controlled to be 50-85 percent, and the percentage reduction of the second pass is controlled to be 45-70 percent; the interval between the passes is 1-15 seconds; and the plates are finally rolled to be 1.0-3.0mm through multiple passes. The method has the advantages that: strong {111}(112) fiber textures are formed in central layers of the hot rolled plates, partial {110}(100) oriented fine grains are generated on surface layers, the structure facilitates generating GOSS textures and improving and stabilizing secondary recrystallization, the performance of the plates is improved, the process flow is simplified, and the method has wide market application prospect.

Description

A kind of hot rolling { manufacture method of 111}＜112＞high silicon steel sheet of orientation

Technical field

The invention belongs to technical field of metal material preparation, relate to a kind of hot rolling { manufacture method of 111}＜112＞high silicon steel sheet of orientation.

Background technology

High silicon steel refers generally to Si content surpass 3.5% silicon steel of (weight percent, down with), has excellent soft magnetic performance, such as high magnetic permeability, and high resistivity, low magnetostriction coefficient, low iron loss etc., especially in the high frequency field, these characteristics are outstanding especially.Has wide application prospect in fields such as making high-frequency electric motor, transformer, Voice ﹠ Video material.

But along with the increase of Si content, ordered structure occurs in the material structure on the one hand, make alloy at room temperature become hard and crisp, processing characteristics sharply descends; Saturation induction density Bs constantly reduces with the increase of silicone content on the other hand, makes that not having the high silicon steel application of orientation is very limited.By changing the oriented structure of sheet material grain structure, to a certain degree can improve saturation induction density, but various countries are considerably less to the report that is orientated high silicon steel.People such as fringe height is at Journal of Applied Physis between day written or printed documents, 70 (10): 6259-6261,1991, in " Magnetic properties of (110) [001] gain oriented 6.5% silicon steel " article reported first the magnetic property of the high silicon steel of relevant orientation, (110) [001] of making by secondary recrystallization is orientated the high silicon steel of 6.5%Si, during thickness of slab 0.35mm, and B ₈Value can be brought up to 1.71T, and at 50Hz, under the condition of Bm=1.3T, magnetic hysteresis loss can drop to 0.067W/kg.The SUMITOMO CHEMICAL metal company is mentioned in (JP63089622A) by control hot rolling, warm-rolling, the medium cold-rolling process of secondary in patent " Production of grain oriented high-Si silicon steel sheet " and has been prepared the thick high silicon plate of 6.5%Si of 0.2 ~ 0.3mm, with MnS or AlN is inhibitor, obtain (110) [001] texture, its B through secondary recrystallization ₈Can reach 1.65T, their concrete technology is secret.Even aspect the high silicon steel of preparation nothing orientation, because the fragility of material, production technique also is unusual complicated, development in recent years a lot of technologies, such as: utilize high-temperature chemical reaction between traditional silicon steel disc surface and the silicide to make Si be enriched in CVD technology on the siliconized plate, special rolling method [T.Ros-Yanez, Y. Houbaert, O. Fischer, J. Schneider, J. Mater. Production of high silicon steel for electrical application by thermomechanical processing. Journal of Materials Processing Technology, 2003,143-144: 916-921], flash set technology [Fish G E, Chang C F, Bye R. Frequency dependence of core loss in rapidly quenched Fe-6.5wt.%Si. Journal of Applied Physics, 1988,64 (10): 5370-5372], spray forming technology [Machado R, Kasama A H, et al. Evolution of the texture of spray-formed Fe-6.5wt.% Si-1.0wt.% Al alloy during warm-rolling. Materials Science and Engineering, 2007; 854-857] and plasticising rolling technique [Lin Junpin progressively, Ye Feng, Chen Guoliang, Deng. the high silicon steel cold rolled sheet of 6.5wt.% Si preparation technology, structure and performance. front line science, 2007.2,2:13-16] etc., utilize these technology to produce very difficulty of the high silicon steel of orientation, can not realize in the technological process rolling the orientation control of plate.

Summary of the invention

The purpose of this invention is to provide a kind of hot rolling { manufacture method of 111}＜112＞high silicon steel sheet of orientation, from material structure design source, control the orientation of high blank plates of silicon steels crystal grain, optimize hot rolling technology, improve the texture of hot rolled plate, be beneficial to the perfect and stable of follow-up secondary recrystallization, make high silicon plate have high magnetic flux density, low magnetostriction coefficient, low iron loss and simplification production technique etc.

A kind of hot rolling { manufacture method of 111}＜112＞high silicon steel sheet of orientation, the chemical ingredients of its high silicon steel (wt%) is: Si:4.0 ~ 9.0, B:0 ~ 0.1, Mn:0.01 ~ 0.08, S:0.010 ~ 0.02, P:0.010 ~ 0.020, C:0.020 ~ 0.045, Al:0.0040 ~ 0.010, all the other are Fe and inevitable inclusion, production method mainly comprises: directional freeze, hot rolling, be specially: mother alloy ingot is carried out refuse carry out directional freeze, prepare high blank plates of silicon steels, the vertical interface metallographic structure of slab is a columanar structure, the direction of growth is mainly＜and 100〉direction, thickness is 3 ~ 25mm, hot rolling direction and the column crystal direction of growth＜100〉parallel, the hot rolling start rolling temperature is 1050 ~ 1310 ℃, finishing temperature is 550 ~ 850 ℃, first percentage pass reduction is controlled at 55 ~ 85%, second percentage pass reduction is controlled at 45 ~ 70%, and every time timed interval is 1 ~ 15s, finish to gauge thickness of slab 1.0 ~ 3.0mm.

Produce the technology of the high silicon steel of orientation with existing report and compare, the invention has the advantages that:

(1) from the material preparation in technology source, the orientation of crystal grain is controlled, made the crystal grain in the as-cast structure all grow final＜100〉direction the columanar structure that generates along＜100〉direction by directional solidification technique.

(2) in the great-deformation hot-rolled process of the high blank plates of silicon steels high temperature of orientation, by the control draught, rolling speed, conditions such as rolling temperature, successfully suppressed the dynamic recrystallization behavior of slab heart portion, it is destroyed that columanar structure of heart portion is not had, just be compressed elongation, crystalline structure rotates in compression process, column crystal is by＜100〉direction forwards to gradually＜and 112〉direction, form very strong { 111}＜112＞microtextured, the top layer forms the tiny recrystal grain layer of one deck simultaneously, the part grain orientation be 011}＜100〉goss texture, prepare for secondary recrystallization annealing in the subsequent technique, improved 110}＜100 the formation ability and the degree of perfection of texture.These all help improving of secondary recrystallization process and stable, and the product over-all properties is improved.

Description of drawings

The high blank plates of silicon steels cross section of Fig. 1 directional freeze { 200} utmost point figure

The high silicon plate of Fig. 2 hot rolling is indulged the interface metallographic structure

The 45 ° of ODF figure in the high silicon plate of Fig. 3 hot rolling surface

45 ° of ODF figure of the high silicon plate heart of Fig. 4 hot rolling portion

Embodiment

Embodiment 1

The chemical ingredients of mother alloy ingot (wt%) is: Si=4.5, and B=0, Mn=0.02, S=0.015, P=0.010, C=0.035, Al=0.004, all the other are Fe and inevitable inclusion.Mother alloy ingot is carried out refuse, utilize apparatus for directional solidification, column crystal is grown along same direction, the thickness of the directed slab of preparation is 25mm, and utmost point figure test result shows that column crystal is along＜100〉direction growths, as shown in Figure 1.

It is great-deformation hot-rolled to carry out high temperature then, and the hot rolling start rolling temperature is 1250 ℃, and finishing temperature is 850 ℃, and first reduction in pass is that 80%, the second reduction in pass is 50%, and it is thick to roll 2.5mm through 6 passage slabs, and every time timed interval is 5s.

Embodiment 2

The chemical ingredients of mother alloy ingot (wt%) is: Si=6.5, and B=0.05, Mn=0.04, S=0.018, P=0.015, C=0.025, Al=0.008, all the other are Fe and inevitable inclusion.Mother alloy ingot is carried out refuse, utilize apparatus for directional solidification to solidify again, the thickness of the directed slab of preparation is 15mm, and utmost point figure test result shows that column crystal is along＜100〉direction growths.

It is great-deformation hot-rolled to carry out high temperature then, and the hot rolling start rolling temperature is 1050 ℃, and finishing temperature is 550 ℃, and first reduction in pass is that 70%, the second reduction in pass is 65%, and it is thick to roll 2.1mm through 5 passage slabs, and every time timed interval is 10s.The metallographic structure of thin plate as shown in Figure 2, surperficial texture such as Fig. 3 of thin plate,, heart portion texture as shown in Figure 4.

Embodiment 3

The chemical ingredients of mother alloy ingot (wt%) is: Si=9.0, and B=0.1, Mn=0.07, S=0.018, P=0.019, C=0.045, Al=0.010, all the other are Fe and inevitable inclusion.Mother alloy ingot is carried out refuse, utilize apparatus for directional solidification to solidify again, the thickness of the directed slab of preparation is 5mm, and utmost point figure test result shows that column crystal is along＜100〉direction growths.

It is great-deformation hot-rolled to carry out high temperature then, and the hot rolling start rolling temperature is 1310 ℃, and finishing temperature is 750 ℃, and first reduction in pass is that 60%, the second reduction in pass is 45%, and it is thick to roll 1.0mm through 4 passage slabs, and every time timed interval is 12s.

Claims

1. hot rolling { manufacture method of 111}＜112＞high silicon steel sheet of orientation, the chemical ingredients of high silicon steel (wt%) is: Si:4.0 ~ 9.0, B:0 ~ 0.1, Mn:0.01 ~ 0.08, S:0.010 ~ 0.02, P:0.010 ~ 0.020, C:0.020 ~ 0.045, Al:0.0040 ~ 0.010, all the other are Fe and inevitable inclusion; Method comprises: directional freeze, hot rolling, it is characterized in that: the high blank plates of silicon steels of directional freeze preparation, the vertical interface metallographic structure of high blank plates of silicon steels is a columanar structure, the direction of growth is mainly＜and 100〉direction, thickness is 3 ~ 25mm, hot rolling direction and the column crystal direction of growth＜100〉parallel, the hot rolling start rolling temperature is 1050 ~ 1310 ℃, finishing temperature is 550 ~ 850 ℃, first percentage pass reduction is controlled at 55 ~ 85%, second percentage pass reduction is controlled at 45 ~ 70%, and every time timed interval is 1 ~ 15s, finish to gauge thickness of slab 1.0 ~ 3.0mm.