CN1904115A - Production method of 450MPa grade cold rolled magnetic pole steel - Google Patents
Production method of 450MPa grade cold rolled magnetic pole steel Download PDFInfo
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- CN1904115A CN1904115A CN 200610019773 CN200610019773A CN1904115A CN 1904115 A CN1904115 A CN 1904115A CN 200610019773 CN200610019773 CN 200610019773 CN 200610019773 A CN200610019773 A CN 200610019773A CN 1904115 A CN1904115 A CN 1904115A
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Abstract
This invention relates to a process of producing 450MPa cold rolled steel magnet. It includes steps as follows: (1)to heat plate body to 1160-1230DEG C;(2)hot rolling steps: the start rolling temperature 1070-1130DEG C,end rolling temperature 870-930DEG C,cooling to 620-680DEG C for coiling. (3)cooling to 70DEG C below for acid picking. (4)cold rolling steps; (5) bell furnace anneal; controlling temperature 620-680DEG C (6) temper rolling, then the products. Account to weight the main chemical composition is: C 0.06-0.1%,Si 0.10-0.30%,Mn 0.80-1.20%,Nb 0.025-0.045 %,Ti:0.025-0.045%,Als 0.02-0.07%,P <=0.025%,S <=0.010%, Fe the rest.
Description
Technical field
The present invention relates to cold rolled magnetic pole steel, particularly yield strength is the production method of 450MPa grade cold rolled magnetic pole steel.
Background technology
For solving China's energy starved problem, country has strengthened the investment of hydroelectric project, at the water power facility of building, extending and reconstruct significantly increase is arranged all, in the special crucial novel material of Large Hydropower Station, the demand of the pole plate that electric generating set rotor uses also significantly increases.
The pole plate of electric generating set rotor requires to have enough intensity could satisfy the safe in utilization of hydrogenerator; For reducing the eddy losses of unit, pole plate must have the magnetic flux better than yoke steel plate; Magnetic pole is set up dress jointly by sheet pack and is made, and for guaranteeing the balance and stability of unit, pole plate requires to have high dimensional precision and surface quality.High strength, high magnetic flux, high precision magnetic poles steel plate three big technological difficulties at present, have only minority developed countries such as the U.S., Germany, Japan can produce fine cold rolled magnetic pole steel plate.
" relationship analysis of microalloying pole plate chemical ingredients and magnetic behavior " that " generator with the exploitation and the application of DJL350 pole plate " that " big motor technology " 2 periodicals in 2002 are stepped on, " Shanghai metal " 9 periodicals in 2003 are stepped on carried out research and analysis to the composition and the technology of the cold rolled magnetic pole steel of 250MPa level, 350MPa level.The production method of the disclosed cold rolled magnetic pole steel of these articles (comprising composition and technology) has the following disadvantages: 1, the cooperation of the armor plate strength of cold rolled magnetic pole steel and magnetic induction density is unreasonable, and the overall quality of cold rolled magnetic pole steel is undesirable; 2, to the requirement harshness of rolling equipment and technology controlling and process, the production cost height.
Adopt other pole plate of bell-type annealing mode production yield strength 450MPa level, not pertinent literature record at present.For yield strength 450MPa level cold-rolled steel sheet, the continuous annealing processes that adopt more, adopt bell-type annealing technology higher to the requirement of strength of hot rolling raw material, therefore require also higher to cold rolling mill, if surpass the cold rolling mill portative power even can cause the damage of electrical system and mechanical system, therefore must take all factors into consideration composition design and processes design, solve the contradiction between armor plate strength and the magnetic, and reduce the load of cold rolling mill as much as possible.
Summary of the invention
Technical problem to be solved by this invention is: a kind of production method of 450MPa grade cold rolled magnetic pole steel is provided, and the cold rolled magnetic pole steel that this method is produced, armor plate strength and magnetic induction density no-float do not have harsh requirement to rolling equipment and technology controlling and process, and cost is low.
The present invention solves the problems of the technologies described above the technical scheme that is adopted:
A kind of production method of 450MPa grade cold rolled magnetic pole steel, it comprises:
(1) slab is heated to 1160-1230 ℃;
(2) hot rolled step; Its start rolling temperature is 1070-1130 ℃, and finishing temperature is 870-930 ℃; Being cooled to 620-680 ℃ batches;
Carry out pickling when (3) being cooled to below 70 ℃;
(4) cold rolling step;
(5) cover annealing; The annealing controlled temperature is 620-680 ℃;
(6) smooth, make the cold rolled magnetic pole steel of 450MPa level.
The weight percent of the main chemical compositions of slab is:
C 0.06-0.1％，Si 0.10-0.30％，Mn 0.80-1.20％， Nb 0.025-0.045％，
Ti：0.025-0.045％，Als 0.02-0.07％，P≤0.025％，S≤0.010％，
Surplus is Fe.
In the such scheme, the type of cooling of step (2) adopts the jet-type water-cooling pattern.
In the such scheme, the type of cooling of step (3) adopts the air cooling mode.
In the such scheme, step (6) adopts the smooth unit elongation of 1.8-2.2% to carry out smooth.
In the such scheme, the cold rolling draft of step (4) is 53-60%.
Compared with prior art, the inventive method has the following advantages:
1, the slab of the inventive method use adopts lower C, Mn content and an amount of microalloy element, the intensity of steel plate and the requirement of magnetic induction density have been guaranteed, thereby solved the contradiction between high strength and the high magnetic flux density, armor plate strength and magnetic induction density no-float, product has excellent comprehensive performances more.
C content is chosen in 0.06-0.10% in the slab, mainly is in order to guarantee the magnetic induction density of cold rolled magnetic pole steel, and for pole plate, the C in the steel still exists the magnetic to steel plate that bigger infringement is arranged with the cementite form as the solid solution form.Do not have on the other hand to select higher C content, its objective is that the intensity of control coils of hot-rolled steel is unlikely too high, to reduce the load of cold rolling mill.The steel that the inventive method is produced, lower yield strength R
ELGreater than 450MPa, magnetic induction density B 50 is greater than 1.59T.
Add Mn in the slab, form substitutional solid solution, promoting steel lower yield strength and tensile strength to be linear increases, yet for magnetic, Mn content is when 0.15-3.0%, and magnetic induction density increases with the manganese content in the steel and reduces, and the content that therefore will control Mn can not be too high, in order to avoid magnetic induction density decline is low excessively, too high Mn also can cause the intensity of coils of hot-rolled steel to improve the load that increases cold rolling mill.
Add microalloy element Nb, Ti in the steel, the more tiny microalloy carbonitride of the size that forms in the steel plays the effect that postpones recrystallize, reach the purpose of crystal grain thinning and precipitation strength, littler to the influence of magnetic of test steel simultaneously than the influence of solid solution carbon and cementite, be improved with regard to the intensity index that makes steel plate like this, also guaranteed the magnetic induction density of steel plate simultaneously.This adopts micro-alloying technology to obtain the major reason of 450MPa level pole plate excellent comprehensive performances just.
Contain higher S, P in the steel, form MnS, the TiS of large-size on the one hand under comparatively high temps, S, P also cause the lattice distortion of crystal grain as solid solution element on the other hand, though it is big to the influence of magnetic to be not so good as the C element, certain influence are arranged also; The detrimental impurity such as MnS, TiS that form have not only been sacrificed the Mn element of steel, also cause the toughness of steel to descend and the anisotropy of steel.Therefore, in the pole plate actual production, should control harmful element content such as S, P for well.Suitably add the Si element and can improve intensity and little, but Si content increases the surface quality that can influence steel plate the magnetic behavior influence.
2, the back segment type of cooling is adopted in hot rolling, coiling temperature is 620-680 ℃, can give full play to the strengthening effect of microalloy element, do not cause the intensity of hot-rolled billet too high again, the method technology controlling and process is strong, has improved the strip shape quality of hot-rolled billet, thereby helps the quality control of cold rolling process, rolling equipment and technology controlling and process are not had harsh requirement, and production cost is low.
3, owing to added microalloy element Nb, be solid-solubilized in atoms metals such as C, Mn, Si are arranged in the steel in addition, cause the intensity of hot-rolled billet higher, if adopt big cold rolling draft will increase the load of milling train, even exceed the rolling power of milling train; If the cold rolling draft that adopts is too small, can not fully gathers the distortion distortional strain energy in the cold-reduced sheet, thereby make the armor plate strength index behind the recrystallize can not return to the level close with hot-rolled billet intensity.Therefore, the cold rolling draft of the cold rolled magnetic pole steel of the inventive method is 53-60%, the higher shape wave defective that is not prone to of the thickness and precision of steel plate.
4, the annealing controlled temperature is 620-680 ℃, temperature is too high, the strength degradation of steel plate also is unfavorable for improving simultaneously the magnetic induction density of steel plate, and temperature is crossed and low can be caused the inhomogeneous of plate property, influence the steel plate stamping quality, and under this technology, anneal, can reach the control recrystallization crystal particle dimension and prevent the purpose that the two-phase particle is grown up, thereby solve the contradiction between magnetic pole steel magnetic behavior and the intensity.
5, to adopt the smooth unit elongation of 1.8-2.2% to carry out smooth in the present invention, can guarantee the quality of plate shape, and favourable for the magnetic behavior that improves magnetic pole steel, for the intensity that improves steel plate certain effect arranged simultaneously.
6, the finishing temperature of hot rolled is higher, just in time is in the suitable rolling temperature scope of general milling train, is beneficial to rolling technology control, has reduced hot rolling pressure simultaneously, has also improved the strip shape quality of hot-rolled billet, thereby has helped the quality control of cold rolling process.
7, succinct C, Mn, Si, the Nb composition of slab is convenient to produce and smelted, and the hot rolling technology production operation simply is easy to control, has reduced the load of cold rolling mill, and the bell-type annealing processing requirement is simple, is easy to produce in enormous quantities.In addition, because steel chemical composition of the present invention requires simply, production technique is simple, so production cost is also just cheap, has the remarkable economic efficiency and the powerful market competitiveness.
The product that the inventive method is produced, integrate high strength, high magnetic strength, high precision, be applicable to and make large-sized water turbine generator rotor block pole core, both can satisfy the requirement of hydraulic generator rotor body magnetic pole on intensity, also satisfied the requirement that reduces the unit eddy losses, given and use producer and user to bring bigger economic benefit and social benefit.
Embodiment
The production method of steel of the present invention mainly comprises several stages such as hot rolling, cold rolling, annealing.
450MPa grade cold rolled magnetic pole steel production method embodiment 1-4 of the present invention, concrete steps are:
(1) heating earlier before the slab hot rolling, Heating temperature 1160-1230 ℃, 1 hour heat tracing time.
(2) hot rolled step; Its start rolling temperature is 1070-1130 ℃, and finishing temperature is 870-930 ℃; Deformation process 7 passages, every time deformation time are at interval less than 0.3s, and final steel billet thickness is rolled into the steel sheet of 2.5-4.5mm specification from 30mm, and jet-type is adopted in rolling back, evenly the water-cooling pattern of appropriateness is cooled to 620-680 ℃ and batches.
(3) adopt the air cooling mode to cool off, coils of hot-rolled steel carries out pickling when being cooled to below 70 ℃.
(4) cold rolling step; Cold rolling draft is 53-60%, the steel sheet of cold rolling one-tenth 1-2mm specification;
(5) cold rolling back coil of strip is packed into bell type annealing furnace carries out recrystallization annealing, and the annealing controlled temperature is 620-680 ℃, reach processing requirement after, change cooling cowl and cool off.
(6) it is smooth to adopt the smooth unit elongation of 1.8-2.2% to carry out, and makes the cold rolled magnetic pole steel of 450MPa level.
The weight percent of the main chemical compositions of the employed slab of 450MPa grade cold rolled magnetic pole steel production method embodiment 1-4 of the present invention is: (unit: %)
| Embodiment | C | Si | Mn | Nb | Ti | Als | P | S |
| 1 | 0.10 | 0.17 | 0.80 | 0.022 | 0.025 | 0.020 | 0.013 | 0.006 |
| 2 | 0.06 | 0.16 | 1.20 | 0.018 | 0.030 | 0.035 | 0.017 | 0.005 |
| 3 | 0.06 | 0.25 | 1.00 | 0.021 | 0.030 | 0.070 | 0.012 | 0.004 |
| 4 | 0.08 | 0.19 | 0.90 | 0.020 | 0.045 | 0.038 | 0.012 | 0.005 |
In the weight percent of above-mentioned chemical ingredients, surplus is Fe.
With the product that the inventive method embodiment 1-4 produces, its lower yield strength R
ELGreater than 520MPa, magnetic induction density B 50 is greater than 1.65T, tensile strength R
mGreater than 600MPa, elongation A
50mmGreater than 20%.
Claims (5)
1, a kind of production method of 450MPa grade cold rolled magnetic pole steel, it is characterized in that: it comprises:
(1) slab is heated to 1160-1230 ℃;
(2) hot rolled step; Its start rolling temperature is 1070-1130 ℃, and finishing temperature is 870-930 ℃; Being cooled to 620-680 ℃ batches;
Carry out pickling when (3) being cooled to below 70 ℃;
(4) cold rolling step;
(5) cover annealing; The annealing controlled temperature is 620-680 ℃;
(6) smooth, make the cold rolled magnetic pole steel of 450MPa level;
The weight percent of the main chemical compositions of slab is:
C 0.06-0.1%, Si 0.10-0.30%, Mn 0.80-1.20%, Nb 0.025-0.045%, Ti:0.025-0.045%, Als 0.02-0.07%, P≤0.025%, S≤0.010%, surplus is Fe.
2, production method as claimed in claim 1 is characterized in that: the type of cooling of step (2) adopts the jet-type water-cooling pattern.
3, production method as claimed in claim 1 is characterized in that: the type of cooling of step (3) adopts the air cooling mode.
4, production method as claimed in claim 1 is characterized in that: step (6) adopts the smooth unit elongation of 1.8-2.2% to carry out smooth.
5, production method as claimed in claim 1 is characterized in that: the cold rolling draft of step (4) is 53-60%.
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| CNB200610019773XA CN100392134C (en) | 2006-07-31 | 2006-07-31 | Production method of 450MPa grade cold rolled magnetic pole steel |
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| CNB200610019773XA CN100392134C (en) | 2006-07-31 | 2006-07-31 | Production method of 450MPa grade cold rolled magnetic pole steel |
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| CN102876870A (en) * | 2012-09-21 | 2013-01-16 | 马钢(集团)控股有限公司 | Method for producing cold-rolled magnetic pole steel plate with yield strength of 250 MPa |
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