Summary of the invention
The technical problem that the present invention will solve is: in order to overcome deficiency of the prior art, the present invention provides a kind of novel anti-theft label magnetic material and production technology and acoustic magnetic anti-theft label.
The technical solution adopted for the present invention to solve the technical problems is: a kind of novel anti-theft label magnetic material, and the chemical composition percentage by weight is: C is≤0.03%, Si is≤0.03%; Mn is≤0.03%, and P is≤0.06%, and S is≤0.03%; Cr is 18.0%~20.0%; Ni is 3.0%~5.0%, and Mo is 3.5%~4.5%, and all the other are Fe; Thickness is 0.05mm~0.2mm.
Has following performance: coercivity H >=100Oe, remanent magnetization Br:0.8T~1.2T, hardness >=600HV.
A kind of production technology of novel anti-theft label magnetic material adopts cold-rolled steel sheet, coercivity H: 10Oe~20Oe, remanent magnetization Br>=70T; The chemical composition percentage by weight is: C is≤0.03%, and Si is≤0.03%, and Mn is≤0.03%, and P is≤0.06%, and S is≤0.03%, and Cr is 18.0%~20.0%, and Ni is 19%~22%, and Mo is 3.5%~4.5%, and all the other are Fe, may further comprise the steps:
(1) described cold-rolled steel sheet being hot-rolled down to thickness is 1 ± 0.2mm;
(2) the surface of steel plate coating thickness after hot rolling is 0.5 ± 0.05mm, contains the heat treatment protective coating of 1%Nb;
(3) steel plate of surface-coated heat treatment protective coating is heat-treated under 850 ℃~900 ℃ temperature;
(4) being cold-rolled to thickness is 0.05 ± 0.005mm;
(5) under 700 ℃~750 ℃ temperature, heat-treat;
(6) cooling obtains finished product.
Described cold-rolled steel sheet thickness is 2.5mm~3.5mm.
A kind of acoustic magnetic anti-theft label; Comprise long and narrow box body, described box body has cavity, is provided with a slice magnetic bias sheet and a slice resonance plate at least in the cavity; Box body is provided with lid; Said magnetic bias sheet and resonance plate are layered arrangement, and described magnetic bias sheet is a novel anti-theft label magnetic material, and described resonance plate is a minicrystal soft magnetic material.
Described magnetic bias sheet is formed by the cutting of novel anti-theft label magnetic material.
Novel anti-theft label magnetic material of the present invention is mainly used in various anti-theft tags, and its purposes is comparatively extensive, is very promising a kind of magnetic material.Have high-ductility, high tenacity, high-coercive force, high strength, the easy characteristic of shearing, and this magnetic material is not easy demagnetization and aging, rustless property is better.From chemical composition, it is similar to stainless steel material, the real ferrous alloy that belongs to; Because the size of this material finished product is thinner; Need the grain size in the control steel, add 1% niobium element, for follow-up cold and hot working plays crystal grain thinning, prevents intercrystalline corrosion.In like manner, it may occur to persons skilled in the art that to add titanium, copper, can play crystal grain thinning equally, prevent the effect of intercrystalline corrosion.
Measured result shows that coercive force is high, and the audio magnetic label that the magnetic material that remanent magnetism is low is made bias slice still can normally be detected by commercial obtainable Ultramax device.Therefore, the requirement of high remanent magnetism is unnecessary, cause on the contrary bigger to resonance plate " clamping " effect and produce excessive damping action to resonance.
On the domestic market, the use of stainless steel material is very general, and use amount is big, can produce in batches, and price is lower, the good selection that the bias slice that adopts stainless steel material manufacturing anti-theft audio magnetic label to use reduces cost beyond doubt.But; Existing technology can only be processed into coercive force height, magnetic material that remanent magnetism is high with stainless steel material; Resonance plate is produced stronger " clamping " thereby the resonance amplitude of effect reduction resonance plate for fear of bias slice, the manufacturing process of audio magnetic label must be complicated, increased production cost.
The invention has the beneficial effects as follows; The present invention adopts stainless steel material as raw material; Cost is low and can be produced in batches by Stainless Steel Production producer; The manufacturer of audio magnetic label only need order and can produce, and the manufacturer that has solved existing half-hard magnetic material is few, the order cycle time long, expensive deficiency; Because novel anti-theft label magnetic material of the present invention is the magnetic material of high-coercive force, low remanent magnetism; Can not produce " clamping " effect during as bias slice to resonance plate and influence the strength of resonance; Thereby the structural design of audio magnetic label is oversimplified, greatly reduce manufacturing cost.
Embodiment
Combine accompanying drawing that the present invention is done further detailed explanation now.These accompanying drawings are the sketch map of simplification, basic structure of the present invention only is described in a schematic way, so it only show the formation relevant with the present invention.
A kind of novel anti-theft label magnetic material, the chemical composition percentage by weight is: C is≤0.03%, and Si is≤0.03%, and Mn is≤0.03%; P is≤0.06%, and S is≤0.03%, and Cr is 18.0%~20.0%; Ni is 3.0%~5.0%, and Mo is 3.5%~4.5%, and all the other are Fe; Thickness is 0.05mm~0.2mm.
Has following performance: coercivity H >=100Oe, remanent magnetization Br:0.8T~1.2T, hardness >=600HV.
A kind of acoustic magnetic anti-theft label; Comprise long and narrow box body 3, described box body 3 has cavity 5, is provided with a slice magnetic bias sheet 1 and a slice resonance plate 2 at least in the cavity 5; Box body 3 is provided with lid 4; Said magnetic bias sheet 1 is layered arrangement with resonance plate 2, and described magnetic bias sheet 1 is claim 1 or 2 described novel anti-theft label magnetic materials, and described resonance plate 2 is a minicrystal soft magnetic material.
Described magnetic bias sheet is formed by the cutting of novel anti-theft label magnetic material.
A kind of production technology of novel anti-theft label magnetic material adopts cold-rolled steel sheet, coercivity H: 10Oe~20Oe, remanent magnetization Br>=70T; The chemical composition percentage by weight is: C is≤0.03%, and Si is≤0.03%, and Mn is≤0.03%, and P is≤0.06%, and S is≤0.03%, and Cr is 18.0%~20.0%, and Ni is 19%~22%, and Mo is 3.5%~4.5%, and all the other are Fe; Thickness is 2.5mm~3.5mm.
Embodiment 1
May further comprise the steps:
(1) described cold-rolled steel sheet being hot-rolled down to thickness is 1 ± 0.2mm;
(2) the surface of steel plate coating thickness after hot rolling is 0.5 ± 0.05mm, contains the heat treatment protective coating of 1%Nb; Contain niobium when high, magnetic property reduces; Contain niobium when low, material final molding difficulty.If adopt vacuum three beams processing method, batch productions such as electrochemical method, cost is high, is not easy to produce in batches.As in the alloy melting process, adding niobium,, and magnetic property is not had any effect owing to the crystal grain thinning effect.
(3) steel plate of surface-coated heat treatment protective coating is heat-treated under 850 ℃~900 ℃ temperature;
(4) being cold-rolled to thickness is 0.05 ± 0.005mm;
(5) under 700 ℃~750 ℃ temperature, heat-treat;
(6) cooling obtains finished product.
Wherein, the content of strict control C, Si, Mn, P, S impurity, otherwise magnetic property is low excessively.Cr gains in strength, anticorrosive.Ni enlarges Alpha's phase, the stabilized magnetic ability, and the words magnetic property decay that content is low is fast.Mo improves coercive force.
Prepared novel anti-theft label magnetic material is according to GB/T 3657 magnetically soft alloy dc magnetic energy measurement methods and GB/T 3658 magnetically soft alloy AC magnetism performance measurement methods test: coercivity H >=100Oe; Remanent magnetization Br:0.8T~1.2T, hardness >=600HV.
Comparative example 1
May further comprise the steps:
(1) described cold-rolled steel sheet being hot-rolled down to thickness is 1 ± 0.2mm;
(2) the surface of steel plate coating thickness after hot rolling is 0.5 ± 0.05mm, contains the heat treatment protective coating of 1%Nb;
(3) steel plate of surface-coated heat treatment protective coating is heat-treated under 950 ℃~1000 ℃ temperature;
(4) being cold-rolled to thickness is 0.05 ± 0.005mm;
(5) under 700 ℃~750 ℃ temperature, heat-treat;
(6) cooling obtains finished product.
Prepared novel anti-theft label magnetic material is tested according to GB/T 3657 magnetically soft alloy dc magnetic energy measurement methods and GB/T 3658 magnetically soft alloy AC magnetism performance measurement methods: coercivity H: 20Oe~40Oe, remanent magnetization Br:0.6T~0.7T.
Therefore, temperature is too high in the step (3), and alloying element can volatilize, and magnetic property reduces, and does not reach requirement.
Comparative example 2
May further comprise the steps:
(1) described cold-rolled steel sheet being hot-rolled down to thickness is 1 ± 0.2mm;
(2) the surface of steel plate coating thickness after hot rolling is 0.5 ± 0.05mm, contains the heat treatment protective coating of 1%Nb;
(3) steel plate of surface-coated heat treatment protective coating is heat-treated under 750 ℃~800 ℃ temperature;
(4) being cold-rolled to thickness is 0.05 ± 0.005mm;
(5) under 700 ℃~750 ℃ temperature, heat-treat;
(6) cooling obtains finished product.
Because temperature is low excessively in the step (3), cause follow-up cold rolling processing alloy band cracking, the material micro-crack increases.
Comparative example 3
May further comprise the steps:
(1) described cold-rolled steel sheet being hot-rolled down to thickness is 1 ± 0.2mm;
(2) the surface of steel plate coating thickness after hot rolling is 0.5 ± 0.05mm, contains the heat treatment protective coating of 1%Nb;
(3) steel plate of surface-coated heat treatment protective coating is heat-treated under 850 ℃~900 ℃ temperature;
(4) being cold-rolled to thickness is 0.05 ± 0.005mm;
(5) under 800 ℃~850 ℃ temperature, heat-treat;
(6) cooling obtains finished product.
Prepared novel anti-theft label magnetic material is tested according to GB/T 3657 magnetically soft alloy dc magnetic energy measurement methods and GB/T 3658 magnetically soft alloy AC magnetism performance measurement methods: coercivity H: 10Oe~20Oe, remanent magnetization Br >=1.3T.
Therefore, the temperature in the step (5) is too high, causes that Hc diminishes, Br becomes big, undesirable.
Comparative example 4
May further comprise the steps:
(1) described cold-rolled steel sheet being hot-rolled down to thickness is 1 ± 0.2mm;
(2) the surface of steel plate coating thickness after hot rolling is 0.5 ± 0.05mm, contains the heat treatment protective coating of 1%Nb;
(3) steel plate of surface-coated heat treatment protective coating is heat-treated under 850 ℃~900 ℃ temperature;
(4) being cold-rolled to thickness is 0.05 ± 0.005mm;
(5) under 650 ℃~700 ℃ temperature, heat-treat;
(6) cooling obtains finished product.
Temperature is low excessively, does not reach heat treatment requirements, can't make novel anti-theft label magnetic material of the present invention.
With above-mentioned foundation desirable embodiment of the present invention is enlightenment, and through above-mentioned description, the related work personnel can carry out various change and modification fully in the scope that does not depart from this invention technological thought.The technical scope of this invention is not limited to the content on the specification, must confirm its technical scope according to the claim scope.