CN103320687B - High-strength magnetic-conductive steel plate and production method thereof - Google Patents

Abstract

The invention discloses a high-speed magnetic-conductive steel plate with a main component of Fe and other components such as Mn, Si, P, S, Als, Nb, and Ti. The steel plate comprises the contents of, by mass: no more than 0.09% of C, no less than 0.09% and less than 0.40% of Mn, 0.45% of Si, no less than 0.05% and no more than 0.15% of P, no morethan 0.012% of S, no less than 0.02% and no more than 0.15 of Als, no less than 0.01% and no more than 0.005% of Nb, no more than 0.005% of Ti, and inevitable impurities. The invention also discloses a production method of the steel plate. With the technical scheme provided by the invention, through the control over smelting chemical components and a proper process, the cold-rolled annealed steel plate with high mechanical performance and good direct-current magnetic performance is obtained. The cold-rolled steel plate has high yield strength and magnetic conductivity. When the steel plate is in use, the steel plate can endure high load and is prevented from deformation.

Description

A kind of High-strength magnetoconductive steel plate and production method thereof

Technical field

The invention belongs to the technical field of metallurgical industry product and production thereof, relate to steel plate strip product and production method thereof.More particularly, the present invention relates to the production method of a kind of High-strength magnetoconductive steel plate and this steel plate.

Background technology

Set up magnetic field occasion for needs application, the method improving magneticstrength adopts magnetically permeable material to amplify magneticstrength.That brings along with the increase of magneticstrength or motion increases by force intensity, needs magnetically permeable material to possess at least dual property, namely requires that magnetically permeable material has high magnetic induction density and high intensity index.

The intensity improving material is generally add alloy element or undergone phase transition by thermal treatment obtain high strength phase or cause high density dislocation or intergranular precipitation occur and strengthens.Adding of alloy element can improve the strength of materials, plasticity and toughness simultaneously, the excessive remarkable reduction magnetic property of inexpensive alloy element addition, and thermal treatment undergoes phase transition to obtain high strength phase or cause high density dislocation to relate to thermal treatment process and controls.Meanwhile, in most cases, thermal treatment process needs the cooperation adding alloy element.

Have high magnetic induction density and intensity index to obtain magnetically permeable material, English Patent GB1351884 improves the method for carbon, manganese and silicone content by alloying.Although the method for English Patent GB1351884 obtains high strength index, magnetic induction density obviously reduces.The method of Chinese patent CN200610019771.0, CN200610019772.5 and CN200610019773.X needs to reheat after steel billet cooling, in order to improve magnetically permeable material intensity, keep high magnetic induction density, increase manganese and niobium by alloying, by the Different adding amount of manganese and niobium, control suitable hot rolling and cold rolled annealed Technology, obtain high mechanical property (intensity index), trying one's best that magnetic induction density reduces simultaneously is few.

Summary of the invention

The invention provides a kind of High-strength magnetoconductive steel plate, its objective is and obtain good magnetic property and mechanical property.

To achieve these goals, the technical scheme that the present invention takes is:

High-strength magnetoconductive steel plate provided by the present invention, main component is Fe, also comprise C, Mn, Si, P, S, Als, Nb, Ti, it is characterized in that: calculate by mass percentage, the content of mentioned component is: C≤0.09,0.09≤Mn < 0.40, Si≤0.45,0.05≤P≤0.15, S≤0.012,0.02≤Als≤0.15,0.01≤Nb≤0.04, Ti≤0.005, and inevitable impurity.

Optimal technical scheme one:

Calculate by mass percentage, the content of mentioned component is: C:0.045, Mn:0.26, Si:0.123, P:0.118, S:0.006, Als:0.05, Nb:0.027, Ti:0.0021.

Optimal technical scheme two:

Calculate by mass percentage, the content of mentioned component is: C:0.019, Mn:0.20, Si:0.083, P:0.136, S:0.004, Als:0.027, Nb:0.024, Ti:0.0018.

Optimal technical scheme three:

Calculate by mass percentage, the content of mentioned component is: C:0.064, Mn:0.28, Si:0.415, P:0.093, S:0.002, Als:0.104, Nb:0.029, Ti:0.0025.

In order to realize the goal of the invention identical with technique scheme, present invention also offers the production method of above-described High-strength magnetoconductive steel plate, its technical scheme is:

Adopt the chemical composition of carbon steel, by the interpolation of phosphorus and niobium, through smelting into qualified molten steel, then continuous casting and rolling becomes coils of hot-rolled steel, pickling afterwards, cold rolling, annealing, smooth, becomes qualified finished steel coils; Or again through finishing, become qualified finished steel coils.

The concrete technical scheme of described production method is:

Molten steel reaches above chemical composition, then through continuous casting and rolling, and slab thickness 40 ~ 110mm, soaking temperature is 1110 ~ 1180 DEG C, hot rolling finishing temperature 800 ~ 900 DEG C, coiling temperature 550 ~ 750 DEG C after hot rolling; According to the difference that finished product requires, coils of hot-rolled steel thickness is at 2.0 ~ 6.0mm.

Then coils of hot-rolled steel carries out pickling, cold rolling, pickling and cold rollingly meet general cold-rolled products requirement;

Coil of strip after cold rolling carries out periodicity annealing, and its annealing process is: annealing temperature 550 ~ 690 DEG C, soaking time 0.5 ~ 6 hour;

Carry out smooth afterwards, smooth unit elongation is 0.5 ~ 2.5%;

If needed, also carry out finished machined, finished machined is to the size required.

Optimal technical scheme: after hot rolling, coiling temperature is more than 650 DEG C.

The present invention adopts technique scheme, by smelting chemical Composition Control, appropriate technology establishment, obtains and has higher force performance and the cold rolled annealed steel plate possessing good DC magnetic performance.This cold-rolled steel sheet possesses high-yield strength and magnetic property, can stand large load and do not deform in using.In the mechanical property of the steel plate produced according to mentioned component and method, yield strength reaches 350N/mm ²above, tensile strength reaches 380N/mm ²above, magnetic induction density is B ₁₀₀be greater than 1.83T, B ₁₅₀be greater than 1.91T.

Embodiment

Below by way of the description to embodiment, the specific embodiment of the present invention is described in further detail, has more complete, accurate and deep understanding to help those skilled in the art to inventive concept of the present invention, technical scheme.

The invention provides a kind of High-strength magnetoconductive steel plate, relate to requirement and have good DC magnetic performance and strength steel strips and production method thereof, this product is used for the occasion that magnetic field is set up, and stands larger load in using.

The object of the invention is to develop there is higher force performance and possess the cold rolled annealed steel plate of high DC magnetic performance.The production of this steel plate, by smelting chemical Composition Control, appropriate technology establishment, obtains high magnetic property and mechanical property.Plate Production is produced by the flow process of steel-making, continuous casting and rolling (thin slab), pickling, cold rolling, cyclic annealing and related process.

Technical scheme of the present invention:

The present invention adopts the chemical composition of carbon steel, and by the interpolation of phosphorus and niobium, through smelting into qualified molten steel, then continuous casting and rolling becomes coils of hot-rolled steel, and pickling afterwards, cold rolling, annealing, smooth, (finishing) be qualified finished steel coils.

The chemical composition ranges of requirement steel is (wt%): C≤0.09,0.09≤Mn < 0.40, Si≤0.45,0.05≤P≤0.15, S≤0.012,0.02≤Als≤0.15,0.01≤Nb≤0.04, Ti≤0.005%, inevitable impurity, all the other are iron.

Molten steel reaches as above chemical composition, then through continuous casting and rolling, slab thickness 40 ~ 110mm, soaking temperature 1110 ~ 1180 DEG C, hot rolling finishing temperature 800 ~ 900 DEG C, coiling temperature 550 ~ 750 DEG C after hot rolling, preferably more than 650 DEG C, the 2.0 ~ 6.0mm that do not coexist that coils of hot-rolled steel thickness requires according to finished product.

Then coils of hot-rolled steel carries out pickling, cold rolling.Pickling and cold rollingly meet general cold-rolled products requirement.

Coil of strip after cold rolling carries out periodicity annealing.Annealing process is: annealing temperature 550 ~ 690 DEG C, soaking time 0.5 ~ 6 hour.

Carry out smooth afterwards, smooth unit elongation 0.5 ~ 2.5%.

If needed, finished machined can be carried out.Finished machined is to the size required.

Implementation result:

Adopt the chemical composition of table 1, it is coils of hot-rolled steel that molten steel carries out continuous casting and rolling, then pickling, cold rolling, and cold-rolled steel sheet annealing temperature is in table 2, and the mechanical performance index obtaining cold-rolled steel sheet is shown in 2, obtains the magnetic property 3 of cold-rolled steel sheet.This cold-rolled steel sheet possesses high-yield strength and magnetic property, can stand large load and do not deform in using.

The chemical composition of smelting molten steel is in table 1.

Table 1: ladle chemistry (wt%)

Sequence number	C	Si	Mn	P	S	Al	Nb	Ti	Fe
										1	0.045	0.123	0.26	0.118	0.006	0.05	0.027	0.0021	Surplus
2	0.019	0.083	0.20	0.136	0.004	0.027	0.024	0.0018	Surplus
										3	0.064	0.415	0.28	0.093	0.002	0.104	0.029	0.0025	Surplus

The sequence number of table 1 and table 2 below, table 3 in correspondence with each other.

According to yield strength 350N/mm in the mechanical property of steel plate of as above method production ²above, tensile strength 380N/mm ²above, magnetic induction density is B ₁₀₀be greater than 1.83T, B ₁₅₀be greater than 1.91T.

Continuous casting of molten steel is thickness 90mm continuously cast bloom, and continuously cast bloom directly enters 1150 DEG C of soaking pits, hot rolling after soaking, hot rolling finishing temperature 860 DEG C, hot roller repairing, batches, coiling temperature 680 DEG C.

Coils of hot-rolled steel through overpickling, be cold rolled to specific thickness.

Coil of strip after cold rolling loads bell furnace and carries out cyclic annealing, and annealing process is in table 2.

Table 2: cyclic annealing technique

Coil of strip after annealing is smooth through levelling machine.Smooth unit elongation is in table 3.

Through the mechanical property of above operation and technological test steel in table 2, magnetic property in table 3.

Table 3: the magnetic property of coil of strip

Sequence number	Magnetic induction density B 100（T）	Magnetic induction density B 150（T）
			1-1	1.840	1.919
1-2	1.830	1.910
			2-1	1.856	1.935
2-2	1.870	1.949
			2-3	1.850	1.929
3-1	1.857	1.938
			3-2	1.883	1.958
3-3	1.876	1.951

Explanation to above-mentioned each table:

1, the chemical composition in table 1 illustrates that the element added does not reach 0.5% of low alloy steel, in order to increase the strengthening effect of alloying element, with the addition of phosphorus and niobium, although silicone content interpolation amount is not high.

2, table 2 is that the chemical composition institute production Heat Treatment Of Steel annealing temperature of steel in table 1 is on the impact of mechanical property.The chemical composition of sequence number 1 600 DEG C of annealing, yield strength > 350N/mm ², 650 DEG C of annealing, yield strength > 300N/mm ².The chemical composition of sequence number 2 550 DEG C of annealing, yield strength > 400N/mm ², 600 ~ 650 DEG C of annealing, yield strength > 350N/mm ².The chemical composition of sequence number 3 550 DEG C of annealing, yield strength > 350N/mm ², 600 ~ 650 DEG C of annealing, yield strength > 300N/mm ².

3, table 3 shows, the direct current magnetic induction density B under table 1 chemical composition and table 2 heat-treatment of annealing processing condition ₁₀₀>=1.83T and B ₁₅₀>=1.91T.

Above to invention has been exemplary description; obvious specific implementation of the present invention is not subject to the restrictions described above; as long as have employed the improvement of the various unsubstantialities that method of the present invention is conceived and technical scheme is carried out; or design of the present invention and technical scheme directly applied to other occasion, all within protection scope of the present invention without to improve.

Claims (3)

1. a production method for High-strength magnetoconductive steel plate, described High-strength magnetoconductive steel plate main component is Fe, also comprises C, Mn, Si, P, S, Als, Nb, Ti; Calculate by mass percentage, the content of mentioned component is: C:0.045, Mn:0.26, Si:0.123, P:0.118, S:0.006, Als:0.05, Nb:0.027, Ti:0.0021; And inevitable impurity;

It is characterized in that described production method is:

Adopt the chemical composition of carbon steel, by the interpolation of phosphorus and niobium, through smelting into qualified molten steel, then continuous casting and rolling becomes coils of hot-rolled steel, pickling afterwards, cold rolling, annealing, smooth, becomes qualified finished steel coils; Or again through finishing, become qualified finished steel coils;

Molten steel reaches above chemical composition, then through continuous casting and rolling, and slab thickness 40 ~ 110mm, soaking temperature is 1110 ~ 1180 DEG C, hot rolling finishing temperature 800 ~ 900 DEG C, coiling temperature 650 ~ 750 DEG C after hot rolling; According to the difference that finished product requires, coils of hot-rolled steel thickness is at 2.0 ~ 6.0mm;

Then coils of hot-rolled steel carries out pickling, cold rolling, pickling and cold rollingly meet general cold-rolled products requirement;

Coil of strip after cold rolling carries out periodicity annealing, and its annealing process is: annealing temperature 550 ~ 690 DEG C, soaking time 0.5 ~ 6 hour;

Carry out smooth afterwards, smooth unit elongation is 0.5 ~ 2.5%;

If needed, also carry out finished machined, finished machined is to the size required.

2. the production method of a High-strength magnetoconductive steel plate, described High-strength magnetoconductive steel plate main component is Fe, also comprise C, Mn, Si, P, S, Als, Nb, Ti, calculate by mass percentage, the content of mentioned component is: C:0.019, Mn:0.20, Si:0.083, P:0.136, S:0.004, Als:0.027, Nb:0.024, Ti:0.0018; And inevitable impurity;

It is characterized in that described production method is:

Adopt the chemical composition of carbon steel, by the interpolation of phosphorus and niobium, through smelting into qualified molten steel, then continuous casting and rolling becomes coils of hot-rolled steel, pickling afterwards, cold rolling, annealing, smooth, becomes qualified finished steel coils; Or again through finishing, become qualified finished steel coils;

Molten steel reaches above chemical composition, then through continuous casting and rolling, and slab thickness 40 ~ 110mm, soaking temperature is 1110 ~ 1180 DEG C, hot rolling finishing temperature 800 ~ 900 DEG C, coiling temperature 550 ~ 750 DEG C after hot rolling; According to the difference that finished product requires, coils of hot-rolled steel thickness is at 2.0 ~ 6.0mm;

Then coils of hot-rolled steel carries out pickling, cold rolling, pickling and cold rollingly meet general cold-rolled products requirement;

Coil of strip after cold rolling carries out periodicity annealing, and its annealing process is: annealing temperature 650 ~ 690 DEG C, soaking time 0.5 ~ 6 hour;

Carry out smooth afterwards, smooth unit elongation is 0.5 ~ 2.5%;

If needed, also carry out finished machined, finished machined is to the size required.

3. the production method of a High-strength magnetoconductive steel plate, described High-strength magnetoconductive steel plate main component is Fe, also comprise C, Mn, Si, P, S, Als, Nb, Ti, calculate by mass percentage, the content of mentioned component is: C:0.064, Mn:0.28, Si:0.415, P:0.093, S:0.002, Als:0.104, Nb:0.029, Ti:0.0025; And inevitable impurity;

It is characterized in that described production method is:

Adopt the chemical composition of carbon steel, by the interpolation of phosphorus and niobium, through smelting into qualified molten steel, then continuous casting and rolling becomes coils of hot-rolled steel, pickling afterwards, cold rolling, annealing, smooth, becomes qualified finished steel coils; Or again through finishing, become qualified finished steel coils;

Molten steel reaches above chemical composition, then through continuous casting and rolling, and slab thickness 40 ~ 110mm, soaking temperature is 1110 ~ 1180 DEG C, hot rolling finishing temperature 800 ~ 900 DEG C, coiling temperature 650 ~ 750 DEG C after hot rolling; According to the difference that finished product requires, coils of hot-rolled steel thickness is at 2.0 ~ 6.0mm;

Then coils of hot-rolled steel carries out pickling, cold rolling, pickling and cold rollingly meet general cold-rolled products requirement;

Coil of strip after cold rolling carries out periodicity annealing, and its annealing process is: annealing temperature 550 ~ 690 DEG C, soaking time 0.5 ~ 6 hour;

Carry out smooth afterwards, smooth unit elongation is 0.5 ~ 2.5%;

If needed, also carry out finished machined, finished machined is to the size required.