CN103290315A - High-strength magnetoconductive steel plate and production method thereof - Google Patents

Abstract

The invention discloses a high-strength magnetoconductive steel plate which comprises a main component of Fe and further comprises the following components in percentage by mass: no more than 0.10% of C, no less than 0.09% and less than 0.40% of Mn, no more than 0.10% of Si, no more than 0.040% of P, no more than 0.012% of S, no less than 0.015% and no more than 0.07% of Als and inevitable impurities. The invention also discloses a production method of the steel plate. According to the technical scheme, by controlling the smelting chemical components and establishing an appropriate process, a cold-rolled annealed steel plate having high mechanical properties and favorable direct-current magnetic properties is obtained. The cold-rolled steel plate has high yield strength and magnetoconductive properties, and can endure a high load without deformation in use.

Description

A kind of high strength magnetic conduction 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 steel band product and production method thereof.More particularly, the present invention relates to a kind of high strength magnetic conduction steel plate, and the production method of this steel plate.

Background technology

The magnetic field occasion is set up in application for needs, and the method that improves magneticstrength is to adopt magnetically permeable material to amplify magneticstrength.The force intensity of bringing along with increase or the motion of magneticstrength that is subjected to increases, and needs magnetically permeable material to possess dual at least performance, namely requires magnetically permeable material to have high magnetic induction density and high intensity index.

The intensity that improves material generally is to add alloy element or undergo phase transition by thermal treatment to obtain high strength mutually or cause high density dislocation or intergranular precipitation takes place and strengthen.The adding of alloy element can improve the strength of materials, plasticity and toughness simultaneously, the excessive remarkable reduction magnetic property of cheap alloy element addition, and thermal treatment undergoes phase transition and obtains high strength mutually or cause high density dislocation to relate to thermal treatment process control.Simultaneously, in most cases, thermal treatment process need be added the cooperation of alloy element.

Below be the relevant patent documentation that retrieves:

In order to make magnetically permeable material have high magnetic induction density and intensity index, the technical scheme of English Patent GB1351884 is: the method that improves carbon, manganese and silicone content by alloying.Though its technical scheme has obtained the high strength index, magnetic induction density obviously reduces.

The technical scheme of Chinese patent CN2006100197710, CN2006100197725 and CN200610019773X is: for intensity, the high magnetic induction density of maintenance that improves magnetically permeable material, pass through alloying, increase manganese and niobium, different additions by manganese and niobium, control suitable hot rolling and cold rolled annealed Technology, obtain high mechanical property (intensity index), what magnetic induction density reduced simultaneously lacks as far as possible.The technical scheme of Chinese patent CN200910049782.7 is to adopt similar coils of hot-rolled steel, the technical scheme of cold rolled annealed employing continuous annealing.

The disclosed technical scheme of above patent documentation, hot rolling steel billet needs cooled reheat, and hot rolling becomes coils of hot-rolled steel then.Simultaneously, the intensity of product is high not enough, and perhaps magnetic induction density is lower.

Summary of the invention

The invention provides a kind of high strength magnetic conduction steel plate, its objective is to obtain good magnetic performance and mechanical property.

To achieve these goals, the technical scheme taked of the present invention is:

High strength magnetic conduction steel plate provided by the invention, 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≤0.10,0.09≤Mn＜0.40, Si≤0.10, P≤0.040, S≤0.012,0.015≤Als≤0.07, and unavoidable impurities.

Optimized technical scheme is: calculate by mass percentage, the content of mentioned component adopts numerical value as shown in the table respectively:

Sequence number	C	Si	Mn	P	S	Al	Fe
								1	0.047	0.017	0.10	0.014	0.0017	0.038	Surplus
2	0.041	0.018	0.11	0.017	0.0013	0.041	Surplus
								3	0.022	0.024	0.10	0.010	0.0035	0.025	Surplus
4	0.022	0.024	0.10	0.010	0.0035	0.021	Surplus
								5	0.054	0.019	0.17	0.017	0.0008	0.045	Surplus
6	0.039	0.011	0.20	0.013	0.0015	0.040	Surplus
								7	0.048	0.012	0.18	0.080	0.0035	0.022	Surplus

In order to realize the goal of the invention identical with technique scheme, the present invention also provides the production method of above-described high strength magnetic conduction steel plate, and its technical scheme is:

Press the proportioning of mentioned component, through smelting into qualified molten steel, become coils of hot-rolled steel through continuous casting and rolling then, pickling afterwards, cold rolling, continuous annealing, smooth become qualified finished product coil of strip; Perhaps pass through finishing again, become qualified finished product coil of strip.

The concrete technical scheme of described production method is:

Molten steel reaches above chemical ingredients, passes through continuous casting and rolling then, slab thickness 40～110mm, and soaking temperature is 1100～1190 ℃, 830～890 ℃ of hot rolling finishing temperatures, coiling temperature is 600～750 ℃ after the hot rolling; According to the difference that finished product requires, coils of hot-rolled steel thickness is at 2.0～6.0mm.

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

Coil of strip after cold rolling carries out continuous annealing, and its annealing process is: 400～550 ℃ of annealing temperatures, soaking time 0.5～5 hour;

Carry out smooth and straightening afterwards, unit elongation 0.1～1.0%;

If desired, also carry out finished machined, finished machined is to the size that requires.

Optimized technical scheme is: coiling temperature is 650 ℃～750 ℃ after the hot rolling.

The present invention adopts technique scheme, formulates by smelting chemical Composition Control, appropriate process, obtained to have higher mechanical property and possess good dc magnetic can cold rolled annealed steel plate.This cold-rolled steel sheet possesses high-yield strength and magnetic property, can stand big load in the use and does not deform.In the mechanical property of the steel plate of producing according to mentioned component and method, yield strength reaches 600N/mm ²More than, tensile strength reaches 610N/mm ²More than, magnetic induction density is B ₅₀Greater than 1.65T, B ₁₀₀Greater than 1.79T.

Embodiment

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

The present invention is a kind of high strength magnetic conduction steel plate, relates to require to have good dc magnetic energy and intensity steel band and production method thereof, and this product is used for the occasion that magnetic field is set up, and stands very large load in the use.

The objective of the invention is to develop and have strong mechanical performance and cold rolled annealed steel plate that possess high dc magnetic energy.The production of this steel plate obtains high magnetic property and mechanical property by smelting chemical Composition Control, appropriate process system.Steel plate production is to produce by steel-making, continuous casting and rolling (thin slab), pickling, flow process and related process cold rolling, continuous annealing.

Technical scheme of the present invention is as follows:

The process of steel of the present invention is smelted into qualified molten steel, and continuous casting and rolling becomes coils of hot-rolled steel then, pickling afterwards, cold rolling, continuous annealing, smooth, (finishing) be qualified finished product coil of strip.

Requiring the chemical ingredients scope of steel is (wt%): C≤0.10,0.09≤Mn＜0.40, Si≤0.10, P≤0.040, S≤0.012,0.015≤Als≤0.07, unavoidable impurities, and all the other are iron.

Molten steel reaches as above chemical ingredients, pass through continuous casting and rolling then, slab thickness 40～110mm, 1100～1190 ℃ of soaking temperatures, 830～890 ℃ of hot rolling finishing temperatures, coiling temperature is 600～750 ℃ after the hot rolling, and is preferred more than 680 ℃, the 2.0～6.0mm that do not coexist that coils of hot-rolled steel thickness requires according to finished product.

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

Coil of strip after cold rolling carries out continuous annealing.Annealing process is: 400～550 ℃ of annealing temperatures, soaking time 0.5～5 minute.

Carry out smooth+straightening afterwards, unit elongation 0.1～1.0%.

If desired, can carry out finished machined.Finished machined is to the size that requires.

Implementation result of the present invention is:

Adopt the chemical ingredients of table 1, it is coils of hot-rolled steel that molten steel carries out continuous casting and rolling, and coils of hot-rolled steel is through overpickling, cold rolling, and cold-rolled steel sheet continuous annealing temperature sees Table 2, and the mechanical performance index that obtains cold-rolled steel sheet sees 2, and the magnetic property that obtains cold-rolled steel sheet sees Table 3.This cold-rolled steel sheet possesses very high yield strength and magnetic property, can stand big load in the use and does not deform.

Yield strength is at 600N/mm in the steel plate mechanical property of producing according to as above method ²More than, tensile strength 610N/mm ²More than, magnetic induction density B ₅₀Greater than 1.65T, B ₁₀₀Greater than 1.79T.

The chemical ingredients of steel sees Table 1.

Table 1: molten steel chemical ingredients (wt%)

Sequence number	C	Si	Mn	P	S	Al	Fe
								1	0.047	0.017	0.10	0.014	0.0017	0.038	Surplus
2	0.041	0.018	0.11	0.017	0.0013	0.041	Surplus
								3	0.022	0.024	0.10	0.010	0.0035	0.025	Surplus
4	0.022	0.024	0.10	0.010	0.0035	0.021	Surplus
								5	0.054	0.019	0.17	0.017	0.0008	0.045	Surplus
6	0.039	0.011	0.20	0.013	0.0015	0.040	Surplus
								7	0.048	0.012	0.18	0.080	0.0035	0.022	Surplus
8	0.039	0.011	0.20	0.013	0.0015	0.041	Surplus

The table 2 of table 1 and back, the sequence number of table 3 are corresponding.

Continuous casting of molten steel is thickness 90mm continuously cast bloom, and continuously cast bloom directly enters 1150 ℃ of soaking pits, hot rolling after the soaking, and 870 ℃ of hot rolling finishing temperatures cool off afterwards, batch, 680 ℃ of coiling temperatures.

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

Coil of strip after cold rolling carries out continuous annealing, and annealing process sees Table 2.

Table 2: cyclic annealing technique

Coil of strip after the annealing is through levelling machine and/or straightening, its unit elongation such as table 2.

Through the mechanical property of above operation and technological test steel see Table 2, magnetic property sees Table 3.

Table 3: the magnetic property of coil of strip

Sequence number	Magnetic induction density B 50（T）	Magnetic induction density B 100（T）
			1	1.68	1.82
2	1.68	1.82
			3	1.67	1.81
4	1.67	1.81
			5	1.65	1.79
6	1.67	1.81
			7	1.66	1.80
8	1.67	1.81

Explanation to above-mentioned each table content:

1, chemical ingredients explanation steel does not carry out alloying in the table 1, belongs to carbon steel.

2, table 2 shows, the continuous annealing temperature is 500 ℃, and thickness is 0.75mm insulation cooling after 1 minute.Thickness is 0.8mm, is incubated cooling after 1.3 minutes.According to the yield strength 〉=600N/mm behind the annealing process of table 1 chemical ingredients and table 2 continuous annealing ², tensile strength 〉=620N/mm ²

3, table 3 shows, behind the annealing process according to table 1 chemical ingredients and table 2 continuous annealing, and corresponding magnetic induction density B ₅₀〉=1.65 T, B ₁₀₀〉=1.79T.

More than the present invention has been carried out exemplary description; obviously specific implementation of the present invention is not subjected to the restriction of aforesaid way; as long as adopted the improvement of the various unsubstantialities that method of the present invention design and technical scheme carry out; or without improving design of the present invention and technical scheme are directly applied to other occasion, all within protection scope of the present invention.

Claims (5)

1. high strength magnetic conduction steel plate, main component is Fe, also comprise C, Mn, Si, P, S, Als, it is characterized in that: calculate by mass percentage, the content of mentioned component is: C≤0.10,0.09≤Mn＜0.40, Si≤0.10, P≤0.040, S≤0.012,0.015≤Als≤0.07, and unavoidable impurities.

2. according to the described high strength magnetic conduction of claim 1 steel plate, it is characterized in that: calculate by mass percentage, the content of mentioned component adopts following table numerical value respectively:

Sequence number C Si Mn P S Al Fe 1 0.047 0.017 0.10 0.014 0.0017 0.038 Surplus 2 0.041 0.018 0.11 0.017 0.0013 0.041 Surplus 3 0.022 0.024 0.10 0.010 0.0035 0.025 Surplus 4 0.022 0.024 0.10 0.010 0.0035 0.021 Surplus 5 0.054 0.019 0.17 0.017 0.0008 0.045 Surplus 6 0.039 0.011 0.20 0.013 0.0015 0.040 Surplus 7 0.048 0.012 0.18 0.080 0.0035 0.022 Surplus

3. according to the production method of the described high strength magnetic conduction of claim 1 steel plate, it is characterized in that: press the proportioning of mentioned component, through smelting into qualified molten steel, become coils of hot-rolled steel through continuous casting and rolling then, pickling afterwards, cold rolling, continuous annealing, smooth become qualified finished product coil of strip; Perhaps pass through finishing again, become qualified finished product coil of strip.

4. according to the production method of the described high strength magnetic conduction of claim 3 steel plate, it is characterized in that:

Molten steel reaches above chemical ingredients, passes through continuous casting and rolling then, slab thickness 40～110mm, and soaking temperature is 1100～1190 ℃, 830～890 ℃ of hot rolling finishing temperatures, coiling temperature is 600～750 ℃ after the hot rolling; According to the difference that finished product requires, coils of hot-rolled steel thickness is at 2.0～6.0mm.

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

Coil of strip after cold rolling carries out continuous annealing, and its annealing process is: 400～550 ℃ of annealing temperatures, soaking time 0.5～5 hour;

Carry out smooth and straightening afterwards, unit elongation 0.1～1.0%;

If desired, also carry out finished machined, finished machined is to the size that requires.

5. according to the production method of the described high strength magnetic conduction of claim 4 steel plate, it is characterized in that: coiling temperature is 650 ℃～750 ℃ after the hot rolling.