CN106435356A - Method for producing non-oriented band steel for stamping - Google Patents
Method for producing non-oriented band steel for stamping Download PDFInfo
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- CN106435356A CN106435356A CN201610821382.3A CN201610821382A CN106435356A CN 106435356 A CN106435356 A CN 106435356A CN 201610821382 A CN201610821382 A CN 201610821382A CN 106435356 A CN106435356 A CN 106435356A
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- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 62
- 239000010959 steel Substances 0.000 title claims abstract description 62
- 238000004519 manufacturing process Methods 0.000 title abstract description 9
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims abstract description 44
- 238000000034 method Methods 0.000 claims abstract description 40
- 238000000137 annealing Methods 0.000 claims abstract description 28
- 229910045601 alloy Inorganic materials 0.000 claims abstract description 25
- 239000000956 alloy Substances 0.000 claims abstract description 25
- 229910052742 iron Inorganic materials 0.000 claims abstract description 20
- 238000011282 treatment Methods 0.000 claims abstract description 13
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 claims abstract description 11
- 238000005098 hot rolling Methods 0.000 claims abstract description 11
- 239000011593 sulfur Substances 0.000 claims abstract description 11
- 229910052717 sulfur Inorganic materials 0.000 claims abstract description 11
- 238000005097 cold rolling Methods 0.000 claims abstract description 10
- 238000009749 continuous casting Methods 0.000 claims abstract description 9
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims abstract description 8
- 229910052782 aluminium Inorganic materials 0.000 claims abstract description 8
- 229910052799 carbon Inorganic materials 0.000 claims abstract description 8
- 239000011248 coating agent Substances 0.000 claims abstract description 8
- 238000000576 coating method Methods 0.000 claims abstract description 8
- 238000005554 pickling Methods 0.000 claims abstract description 8
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims abstract description 7
- 229910052710 silicon Inorganic materials 0.000 claims abstract description 7
- 239000010703 silicon Substances 0.000 claims abstract description 7
- 238000007872 degassing Methods 0.000 claims abstract description 5
- 238000004080 punching Methods 0.000 claims description 37
- 239000011572 manganese Substances 0.000 claims description 9
- 238000005096 rolling process Methods 0.000 claims description 8
- 238000006477 desulfuration reaction Methods 0.000 claims description 7
- 230000023556 desulfurization Effects 0.000 claims description 7
- 229910052748 manganese Inorganic materials 0.000 claims description 7
- PWHULOQIROXLJO-UHFFFAOYSA-N Manganese Chemical compound [Mn] PWHULOQIROXLJO-UHFFFAOYSA-N 0.000 claims description 6
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 claims description 6
- 238000005266 casting Methods 0.000 claims description 5
- 239000007788 liquid Substances 0.000 claims description 5
- 230000005540 biological transmission Effects 0.000 claims description 4
- 230000010355 oscillation Effects 0.000 claims description 4
- 230000003647 oxidation Effects 0.000 claims description 4
- 238000007254 oxidation reaction Methods 0.000 claims description 4
- 229910000976 Electrical steel Inorganic materials 0.000 claims description 3
- 230000004907 flux Effects 0.000 claims description 3
- 241001062472 Stokellia anisodon Species 0.000 claims 1
- 238000002425 crystallisation Methods 0.000 claims 1
- 230000008025 crystallization Effects 0.000 claims 1
- 239000002253 acid Substances 0.000 abstract description 2
- 238000007670 refining Methods 0.000 abstract description 2
- 125000004122 cyclic group Chemical group 0.000 abstract 1
- WPBNNNQJVZRUHP-UHFFFAOYSA-L manganese(2+);methyl n-[[2-(methoxycarbonylcarbamothioylamino)phenyl]carbamothioyl]carbamate;n-[2-(sulfidocarbothioylamino)ethyl]carbamodithioate Chemical compound [Mn+2].[S-]C(=S)NCCNC([S-])=S.COC(=O)NC(=S)NC1=CC=CC=C1NC(=S)NC(=O)OC WPBNNNQJVZRUHP-UHFFFAOYSA-L 0.000 abstract 1
- 238000005516 engineering process Methods 0.000 description 5
- 230000004048 modification Effects 0.000 description 4
- 238000012986 modification Methods 0.000 description 4
- 238000005275 alloying Methods 0.000 description 3
- 238000002474 experimental method Methods 0.000 description 3
- 238000012360 testing method Methods 0.000 description 3
- VEXZGXHMUGYJMC-UHFFFAOYSA-N Hydrochloric acid Chemical compound Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 description 2
- 238000003723 Smelting Methods 0.000 description 2
- 238000001816 cooling Methods 0.000 description 2
- 238000001514 detection method Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 239000004615 ingredient Substances 0.000 description 2
- 238000001953 recrystallisation Methods 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 238000005299 abrasion Methods 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 238000005261 decarburization Methods 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- 230000001050 lubricating effect Effects 0.000 description 1
- 230000014759 maintenance of location Effects 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 238000003801 milling Methods 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 238000005507 spraying Methods 0.000 description 1
- 238000003892 spreading Methods 0.000 description 1
- 230000000087 stabilizing effect Effects 0.000 description 1
- 238000004781 supercooling Methods 0.000 description 1
- 238000009849 vacuum degassing Methods 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/02—Ferrous alloys, e.g. steel alloys containing silicon
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
- C21D1/26—Methods of annealing
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
- C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
- C21D8/0221—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the working steps
- C21D8/0226—Hot rolling
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
- C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
- C21D8/0221—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the working steps
- C21D8/0236—Cold rolling
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
- C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
- C21D8/0247—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the heat treatment
- C21D8/0273—Final recrystallisation annealing
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/004—Very low carbon steels, i.e. having a carbon content of less than 0,01%
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/04—Ferrous alloys, e.g. steel alloys containing manganese
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/06—Ferrous alloys, e.g. steel alloys containing aluminium
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Manufacturing Of Steel Electrode Plates (AREA)
Abstract
The embodiment of the invention provides a method for producing non-oriented band steel for stamping. The method is adopted for improving the mechanical property of the non-oriented band steel for stamping, and the magnetic performance can be kept unchanged basically. The method comprises the steps that molten iron for the non-oriented band steel for stamping is smelted and produced in a converter; molten steel output from the converter is subjected to RH refining through a molten steel vacuum cyclic degassing method to obtain an alloy, wherein the alloy comprises, by mass, 0.0010%-0.0050% of carbon, 2.5%-3.5% of silicon, 0.3%-1.0% of aluminum, 0.2%-1.0% of manganese, and less than or equal to 0.01% of sulfur; the alloy is subjected to continuous casting to obtain a plate blank; the plate blank is subjected to hot rolling to obtain a hot rolled plate; the hot rolled plate is subjected to normalizing and acid pickling treatment in a normalizing furnace to obtain a normalized plate; the normalized plate is subjected to cold rolling in a twenty-high roll mill to obtain a chill plate; the chill plate is subjected to continuous annealing treatment; and the surface of the annealed band steel is coated with a semi-organic coating to obtain the non-oriented band steel for stamping.
Description
Technical field
The present invention relates to metal processing sectors, more particularly, to a kind of method producing punching press No yield point strip steel.
Background technology
The drawing velocity improving process of producing product is very important for improve production efficiency.Such as drawing velocity by
260 beats/min bring up to 300 beats/min, and production efficiency can lift 15%.
However, the raising of drawing velocity is restricted by several factors, such as punch press Motor Capability, punch press lubricating system ability,
Rotor detection speed, punching press mechanical property of No yield point strip steel etc..Wherein, the punching press mechanical property shadow of No yield point strip steel
Sound is more notable.The yield strength of strip steel is relatively low, then stamping machine burr is big, easy fracture；Strip steel yield strength is higher, then after punching press
Yielding, punch press abrasion is big.In addition, in the related, while improving the mechanical property of punching press No yield point strip steel, hold
Easily strip steel magnetic property, and then affect to produce the performance indications of product.
So, there is the mechanical property how improving punching press No yield point strip steel in prior art, keep magnetic property base simultaneously
This constant technical problem.
Content of the invention
Embodiments provide a kind of method producing punching press No yield point strip steel, for improving punching press No yield point
The mechanical property of strip steel, and keep magnetic property to be basically unchanged.
In a first aspect, the invention provides a kind of method producing punching press No yield point strip steel, including：
The molten iron producing punching press No yield point strip steel is smelted in converter；
Described in molten steel vacuum circulation degassing method RH refine, the molten steel of converter output, obtains alloy；Wherein, described alloy
Mass ratio includes 0.0010%～0.0050% carbon, 2.5%～3.5% silicon, 0.3%～1.0% aluminum, 0.2%～
1.0% manganese and the sulfur less than or equal to 0.01%；
Described alloy is carried out with continuous casting, obtains slab；
Slab described in hot rolling, obtains hot rolled plate；
In normalizing furnace, described hot rolled plate is carried out with normalizing, pickling processes, obtains normalizing plate；
Cold rolling described normalizing plate in mill, obtains chill plate；
Continuous annealing treatment is carried out to described chill plate；
Belt steel surface coating half organic coating after the annealing process, obtains punching press No yield point strip steel.
Optionally, in normalizing furnace, described hot rolled plate is carried out with normalizing, pickling processes, obtains normalizing plate, including：
Described hot rolled plate is conveyed in the normalizing furnace that furnace temperature is 800 DEG C～1000 DEG C and is incubated the first duration.
Optionally, continuous annealing treatment is carried out to described chill plate, including：
Described chill plate is conveyed into annealing furnace, makes the described annealing that described chill plate is 900 DEG C～1150 DEG C in furnace temperature
It is incubated the second duration in stove.
Optionally, methods described also includes：
It is passed through full guard gas in the furnace chamber of described annealing furnace, to reduce the degree of oxidation of described chill plate.
Optionally, before converter being smelted the production molten iron with No yield point strip steel for the punching press, also include：
Desulfurization process are carried out to the described molten iron that will enter described converter, so that the sulfur content of described molten iron is less than or equal to
0.01%.
Optionally, during carrying out continuous casting to described alloy, crystallizer is controlled to be adjusted according to the liquid level of described alloy
Oscillation Amplitude.
Optionally, described alloy is being carried out in casting process, using non-orientation silicon steel mould flux to described slab
Protected；
The slab thickness of the described slab that described casting process obtains is 230mm～250mm, a length of 9.2m～10.2m of base.
Optionally, slab described in hot rolling, obtains hot rolled plate, including：
1 described slab is rolled in the first roughing mill of the roughing mills of Hot Rolling Mill；
5 described slabs are rolled in the second roughing mill of described roughing mills.
Optionally, slab described in hot rolling, obtains hot rolled plate, also includes：
Described slab after transmission roughing passes sequentially through seven finishing mills of the mm finishing mill unit of Hot Rolling Mill, to described slab
Carry out 7 finish rolling, obtain described hot rolled plate；
Cool down described hot rolled plate；The thickness of the described hot rolled plate of described Hot Rolling Mill output is 2.0mm～2.6mm.
Optionally, cold rolling described normalizing plate in mill, obtains chill plate, including：
6 cold rolling described normalizing plates repeatedly in described mill, described normalizing plate is rolled into thickness is
The described chill plate of 0.35mm.
Said one in the embodiment of the present application or multiple technical scheme, at least have following one or more technology effect
Really：
0.0010%～0.0050% carbon in the technical scheme of the embodiment of the present invention, is included using mass ratio, 2.5%
～3.5% silicon, 0.3%～1.0% aluminum, the alloy production punching of 0.2%～1.0% manganese and the sulfur less than or equal to 0.01%
Pressure uses No yield point strip steel, improves the mechanical property of the punching press that final production goes out No yield point strip steel.Its yield strength can reach
More than or equal to 380MPa, tensile strength is more than or equal to 500MPa.
Further, by 800 DEG C～1000 DEG C of high temperature normalizing treatment so that hot rolled plate fibrous tissue be changed into thick again
Crystalline structure, crystallite dimension reaches 120 μm～160 μm, improves the magnetic property of punching press No yield point strip steel, so it is achieved that
While improving mechanical property, magnetic property is kept to be basically unchanged.
Further, annealed by 900 DEG C～1150 DEG C of annealing temperature so that fibrous tissue occurs to recover and tie
Crystalline substance, and then control crystallite dimension at 30 μm～50 μm so that the stamping machine that the punching press of the present invention is made with No yield point strip steel is carried out
Higher speed can be maintained during punching press, and be not susceptible to rupture, strip steel magnetic property P1.5≤2.5W/kg simultaneously, B50 >=
1.68T, is maintained at higher level.
Specific embodiment
Embodiments provide a kind of method producing punching press No yield point strip steel, for improving punching press No yield point
The mechanical property of strip steel, and keep magnetic property to be basically unchanged.
Below by specific embodiment, technical solution of the present invention is described in detail it should be understood that the embodiment of the present application with
And the specific features in embodiment are the detailed description to technical scheme, rather than the limit to technical scheme
Fixed, in the case of not conflicting, the technical characteristic in the embodiment of the present application and embodiment can be mutually combined.
The terms "and/or", only a kind of incidence relation of description affiliated partner, represents there may be three kinds of passes
System, for example, A and/or B, can represent：, there are A and B, these three situations of individualism B in individualism A simultaneously.In addition, herein
Middle character "/", typically represent forward-backward correlation to as if a kind of relation of "or".
What the present invention provided produces the punching press method of No yield point strip steel, comprises the steps：
S101：The molten iron producing punching press No yield point strip steel is smelted in converter；
S102：Described in molten steel vacuum circulation degassing method RH refine, the molten steel of converter output, obtains alloy；
S103：Described alloy is carried out with continuous casting, obtains slab；
S104：Slab described in hot rolling, obtains hot rolled plate；
S105：In normalizing furnace, described hot rolled plate is carried out with normalizing, pickling processes, obtains normalizing plate；
S016：Cold rolling described normalizing plate in mill, obtains chill plate；
S107：Continuous annealing treatment is carried out to described chill plate；
S108：Belt steel surface coating half organic coating after the annealing process, obtains punching press No yield point strip steel.
Optionally, before S101, also include：
Desulfurization process are carried out to the described molten iron that will enter described converter, so that the sulfur content of described molten iron is less than or equal to
0.01%.
Specifically, in embodiments of the present invention, before S101, desulfurization process are carried out to the molten iron that will enter converter, will
The sulfur S content of molten iron, or the mass ratio of S drops below equal to 0.01%.Wherein, desulfurization method can be using in prior art
Mode, the present invention just do not describe one by one.
Molten iron after desulfurization is poured in converter, wherein, converter in S101 can for 220 tons of converters or its
The converter of his specification, the present invention is not particularly limited.In smelting process, constantly converter is heated, control the molten iron in converter
Temperature is remained above equal to 1300 DEG C.
Molten iron after smelting is converted to molten steel, from converter output.Further, in S102, using RH method (liquid vacuum cycle
Degassing method, RH-vacuum degassing, common by West Germany Rule iron company Ruhrstahl and He Laousi Hereaeus
A kind of molten steel secondary refining method designed and developed) alloying refine is carried out to molten steel.
In embodiments of the present invention, first by decarburization mode treatment, reduce alloy carbon content.Then according to mass ratio is
0.0010%～0.0050% carbon C's, 2.5%～3.5% silicon Si, 0.3%～1.0% aluminum Al, 0.2%～1.0%
The manganese Mn and sulfur S less than or equal to 0.01%, remaining ingredient is ferrum Fe and the ratio of impurity carries out RH refine.It is eventually adding RH desulfurization
The excessive S of agent abjection.
RH refine obtain alloy mass than the carbon C for 0.0010%～0.0050%, 2.5%～3.5% silicon Si,
0.3%～1.0% aluminum Al, 0.2%～1.0% manganese Mn and the sulfur S less than or equal to 0.01%, remaining ingredient is ferrum Fe and miscellaneous
Matter.
Due to the embodiment of the present invention to alloying component unlike the prior art, by adjusting Si, the ratio of Al and Mn element
Realize improving the mechanical property of final punching press No yield point strip steel.
Then, in S103, alloy is poured into continuous casting in conticaster, alloy is casting continuously to form slab.Specifically, the present invention
The crystallizer of the conticaster in embodiment can adjust Oscillation Amplitude according to the situation of alloy liquid level.Specifically, passing through crystallizer
In real time to level detection result, dynamically adjust Oscillation Amplitude, and then adjust the rate of cooling of alloying molten steel it is ensured that liquid level stabilizing
Produce.
Further, in order to avoid alloy oxidation, using non-orientation silicon steel mould flux, the slab that continuous casting goes out is protected
Shield., in 230mm～250mm, base length is between 9.2m～10.2m for the slab thickness that in the embodiment of the present invention, continuous casting goes out.For example, plate
After base, thickness is 230mm, 235mm, 240mm, 245mm or 250mm etc.；Plate a length of 9.2m, 9.4m, 9.6m, 9.8m, 10.0m or
10.2m etc..Those skilled in the art can be configured according to actual, and the present invention is not particularly limited.
Next, hot rolling is carried out to slab in S104.Specifically, the Hot Rolling Mill in the embodiment of the present invention includes slightly
Milling train group and mm finishing mill unit.Roughing mills include two different roughing mills of precision, and mm finishing mill unit includes continuous five finish rolling
Machine.S104 specifically includes：
1 described slab is rolled in the first roughing mill of the roughing mills of Hot Rolling Mill；
5 described slabs are rolled in the second roughing mill of described roughing mills.
And, S104 also includes：
Described slab after transmission roughing passes sequentially through seven finishing mills of the mm finishing mill unit of Hot Rolling Mill, to described slab
Carry out 7 finish rolling, obtain described hot rolled plate；
Cool down described hot rolled plate；The thickness of the described hot rolled plate of described Hot Rolling Mill output is 2.0mm～2.6mm.
Specifically, first slab is transferred to roughing 1 time in the first roughing mill of roughing mills, is then transferred to again
Roughing 5 times in two roughing mills.In other words, in roughing, slab is rolled using the pattern of 1+5.Then, slab is transmitted
To mm finishing mill unit, pass sequentially through seven finishing mills.Every finishing mill to slab finish rolling 1 time, altogether to slab finish rolling 7 times.
Slab after hot rolling becomes hot rolled plate, exports Hot Rolling Mill after supercooling.In the embodiment of the present invention, Hot Rolling Mill
Output hot rolling plate thickness between 2.0mm～2.6mm, such as 2.0mm, 2.1mm, 2.2mm, 2.3mm, 2.4mm, 2.5mm or
2.6mm waiting.
Then, in embodiments of the present invention, using the refrigerating mode of section cooling, the hot rolled plate after finish rolling is cooled down.
Then, in S105, normalizing, pickling processes are carried out to hot rolled plate.In embodiments of the present invention, S105 specifically wraps
Include：
Described hot rolled plate is conveyed in the normalizing furnace that furnace temperature is 800 DEG C～1000 DEG C and is incubated the first duration.
Specifically, in order to keep the magnetic property of impact No yield point strip steel, the furnace temperature of normalizing furnace 800 DEG C have been heightened
～1000 DEG C.During implementing, can be specifically configured to 800 DEG C, 825 DEG C, 850 DEG C, 875 DEG C, 900 DEG C, 925 DEG C,
950 DEG C, 975 DEG C or 1000 DEG C etc., those skilled in the art can be configured according to actual, the present invention
Do not do specifically present.
Further, a length of first duration during insulation in normalizing furnace for the hot rolled plate.In embodiments of the present invention, the first duration
For 55S～65S, such as 55S, 58S, 60S, 63S or 65S etc., the present invention is not particularly limited.
By 800 DEG C～1000 DEG C of high temperature normalizing treatments so that hot rolled plate fibrous tissue is changed into thick recrystallization group
Knit, by experiment test, crystallite dimension reaches 120 μm～160 μm.Therefore, maintain preferable magnetic property.
Further, the hot rolled plate after water-spraying control normalizing treatment, and S105 carries out ball blast acid using hydrochloric acid to hot rolled plate
Wash.Further, the hot rolled plate after cold rolling normalizing treatment in S106, specifically includes：
6 cold rolling described normalizing plates repeatedly in described mill, described normalizing plate is rolled into thickness is
The described chill plate of 0.35mm.
Specifically, the normalizing plate after pickling is transferred in mill.And, enter through 6 circle transmission and
Transmit out mill, and then enable normalizing plate by mill repeat-rolling 6 times.In embodiments of the present invention, roll
Make the normalizing plate thickness after 6 times and be reduced to 0.35mm, become chill.
Then, in S107, chill plate is annealed.Carry out annealing in the embodiment of the present invention to be specially：
Described chill plate is conveyed into annealing furnace, makes the described annealing that described chill plate is 900 DEG C～1150 DEG C in furnace temperature
It is incubated the second duration in stove.
Specifically, from the entrance of annealing furnace by incoming for chill plate annealing furnace.Temperature in annealing furnace 900 DEG C～
Between 1150 DEG C, such as 900 DEG C, 950 DEG C, 1000 DEG C, 1050 DEG C, 1100 DEG C or 1150 DEG C, and the temperature in annealing furnace from
Entrance, on Way out, is gradually increased to the highest temperature, is then gradually lowered from the highest temperature.Therefore, chill plate is incoming from entrance,
Temperature also will be gradually increased to the highest temperature, then be gradually lowered, and finally spread out of from outlet.
In addition, chill plate temperature retention time in the lehr is the second duration, that is, be passed to from entrance spreading out of from outlet
Time be the second time.A length of 25S～35S when second, such as 25S, 28S, 30S, 33S or 35S etc., the present invention does not do specifically
Limit.
Further, in order to avoid over oxidation in annealing process, in embodiments of the present invention, by the furnace chamber of annealing furnace
It is passed through full guard gas.
By 900 DEG C～1150 DEG C of high annealings so that dimensional tissue occurs Recovery and recrystallization, by experiment test,
Crystallite dimension reaches 30 μm～50 μm.Therefore, maintain preferable magnetic property.
Finally, in S108, belt steel surface after annealing coats upper half organic coating, obtains punching press No yield point band
Steel.
Through experiment test, the punching press that produced using the method for the embodiment of the present invention yield strength of No yield point strip steel
More than or equal to 380MPa, tensile strength is more than or equal to 500MPa, iron loss P1.5≤2.5W/kg, magnetic strength B50 >=1.68T.And it is existing
The punching press producing in technology is more than or equal to 350MPa with the yield strength of No yield point strip steel, and tensile strength is more than or equal to 470MPa,
Iron loss P1.5≤2.7W/kg, magnetic strength B50 >=1.67T.It can be seen that, the punching press being produced by the method for the embodiment of the present invention is no taken
It is higher than prior art to the mechanical property of strip steel, and magnetic property is also superior to prior art.
Said one in the embodiment of the present application or multiple technical scheme, at least have following one or more technology effect
Really：
0.0010%～0.0050% carbon in the technical scheme of the embodiment of the present invention, is included using mass ratio, 2.5%
～3.5% silicon, 0.3%～1.0% aluminum, the alloy production punching of 0.2%～1.0% manganese and the sulfur less than or equal to 0.01%
Pressure uses No yield point strip steel, improves the mechanical property of the punching press that final production goes out No yield point strip steel.Its yield strength can reach
More than or equal to 380MPa, tensile strength is more than or equal to 500MPa.
Further, by 800 DEG C～1000 DEG C of high temperature normalizing treatment so that hot rolled plate fibrous tissue be changed into thick again
Crystalline structure, crystallite dimension reaches 120 μm～160 μm, improves the magnetic property of punching press No yield point strip steel, so it is achieved that
While improving mechanical property, magnetic property is kept to be basically unchanged.
Further, annealed by 900 DEG C～1150 DEG C of annealing temperature so that fibrous tissue occurs to recover and tie
Crystalline substance, and then control crystallite dimension at 30 μm～50 μm so that the stamping machine that the punching press of the present invention is made with No yield point strip steel is carried out
Higher speed can be maintained during punching press, and be not susceptible to rupture, strip steel magnetic property P1.5≤2.5W/kg simultaneously, B50 >=
1.68T, is maintained at higher level.
Obviously, those skilled in the art can carry out the various changes and modification essence without deviating from the present invention to the present invention
God and scope.So, if these modifications of the present invention and modification belong to the scope of the claims in the present invention and its equivalent technologies
Within, then the present invention is also intended to comprise these changes and modification.
Claims (10)
1. a kind of method producing punching press No yield point strip steel is it is characterised in that include：
The molten iron producing punching press No yield point strip steel is smelted in converter；
Described in molten steel vacuum circulation degassing method RH refine, the molten steel of converter output, obtains alloy；Wherein, the mass ratio of described alloy
Including 0.0010%～0.0050% carbon, 2.5%～3.5% silicon, 0.3%～1.0% aluminum, 0.2%～1.0% manganese
With the sulfur less than or equal to 0.01%；
Described alloy is carried out with continuous casting, obtains slab；
Slab described in hot rolling, obtains hot rolled plate；
In normalizing furnace, described hot rolled plate is carried out with normalizing, pickling processes, obtains normalizing plate；
Cold rolling described normalizing plate in mill, obtains chill plate；
Continuous annealing treatment is carried out to described chill plate；
Belt steel surface coating half organic coating after the annealing process, obtains punching press No yield point strip steel.
2. the method for claim 1 it is characterised in that carry out normalizing, at pickling in normalizing furnace to described hot rolled plate
Reason, obtains normalizing plate, including：
Described hot rolled plate is conveyed in the normalizing furnace that furnace temperature is 800 DEG C～1000 DEG C and is incubated the first duration.
3. method as claimed in claim 2 is it is characterised in that carry out continuous annealing treatment to described chill plate, including：
Described chill plate is conveyed into annealing furnace, make described chill plate furnace temperature be 900 DEG C～1150 DEG C described annealing furnace in
It is incubated the second duration.
4. method as claimed in claim 3 is it is characterised in that methods described also includes：
It is passed through full guard gas in the furnace chamber of described annealing furnace, to reduce the degree of oxidation of described chill plate.
5. method as claimed in claim 4 is it is characterised in that smelt the molten iron producing punching press No yield point strip steel in converter
Before, also include：
Desulfurization process are carried out to the described molten iron that will enter described converter, so that the sulfur content of described molten iron is less than or equal to
0.01%.
6. method as claimed in claim 5 is it is characterised in that during carrying out continuous casting to described alloy, control crystallization
Device adjusts Oscillation Amplitude according to the liquid level of described alloy.
7. method as claimed in claim 6 is it is characterised in that carrying out in casting process to described alloy, using No yield point
Silicon steel mould flux is protected to described slab；
The slab thickness of the described slab that described casting process obtains is 230mm～250mm, a length of 9.2m～10.2m of base.
8. method as claimed in claim 7, it is characterised in that slab described in hot rolling, obtains hot rolled plate, including：
1 described slab is rolled in the first roughing mill of the roughing mills of Hot Rolling Mill；
5 described slabs are rolled in the second roughing mill of described roughing mills.
9. method as claimed in claim 8, it is characterised in that slab described in hot rolling, obtains hot rolled plate, also includes：
Described slab after transmission roughing passes sequentially through seven finishing mills of the mm finishing mill unit of Hot Rolling Mill, and described slab is carried out
7 finish rolling, obtains described hot rolled plate；
Cool down described hot rolled plate；The thickness of the described hot rolled plate of described Hot Rolling Mill output is 2.0mm～2.6mm.
10. method as claimed in claim 9 it is characterised in that in mill cold rolling described normalizing plate, obtain chill
Plate, including：
6 cold rolling described normalizing plates repeatedly in described mill, it is 0.35mm's that described normalizing plate is rolled into thickness
Described chill plate.
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| CN106435356B (en) | 2019-06-04 |
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