CN106435356B - A method of producing punching press No yield point strip - Google Patents
A method of producing punching press No yield point strip Download PDFInfo
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- CN106435356B CN106435356B CN201610821382.3A CN201610821382A CN106435356B CN 106435356 B CN106435356 B CN 106435356B CN 201610821382 A CN201610821382 A CN 201610821382A CN 106435356 B CN106435356 B CN 106435356B
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- 238000000034 method Methods 0.000 title claims abstract description 44
- 238000004080 punching Methods 0.000 title claims abstract description 42
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims abstract description 44
- 238000000137 annealing Methods 0.000 claims abstract description 31
- 229910045601 alloy Inorganic materials 0.000 claims abstract description 26
- 239000000956 alloy Substances 0.000 claims abstract description 26
- 229910052742 iron Inorganic materials 0.000 claims abstract description 21
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 18
- 239000010959 steel Substances 0.000 claims abstract description 18
- 238000004519 manufacturing process Methods 0.000 claims abstract description 15
- 238000009749 continuous casting Methods 0.000 claims abstract description 13
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 claims abstract description 11
- 238000005097 cold rolling Methods 0.000 claims abstract description 10
- 238000005098 hot rolling Methods 0.000 claims abstract description 10
- 239000011572 manganese Substances 0.000 claims abstract description 10
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims abstract description 9
- 229910052799 carbon Inorganic materials 0.000 claims abstract description 9
- 239000005864 Sulphur Substances 0.000 claims abstract description 8
- 229910052782 aluminium Inorganic materials 0.000 claims abstract description 8
- 229910052748 manganese Inorganic materials 0.000 claims abstract description 8
- 238000005554 pickling Methods 0.000 claims abstract description 8
- PWHULOQIROXLJO-UHFFFAOYSA-N Manganese Chemical compound [Mn] PWHULOQIROXLJO-UHFFFAOYSA-N 0.000 claims abstract description 7
- 239000004411 aluminium Substances 0.000 claims abstract description 7
- 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
- 239000011248 coating agent Substances 0.000 claims abstract description 5
- 238000000576 coating method Methods 0.000 claims abstract description 5
- 238000007872 degassing Methods 0.000 claims abstract description 5
- 238000005096 rolling process Methods 0.000 claims description 10
- 238000006477 desulfuration reaction Methods 0.000 claims description 7
- 230000023556 desulfurization Effects 0.000 claims description 7
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 claims description 6
- 238000001816 cooling Methods 0.000 claims description 6
- 239000007788 liquid Substances 0.000 claims description 5
- VEXZGXHMUGYJMC-UHFFFAOYSA-N Hydrochloric acid Chemical compound Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 claims description 4
- 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
- 229910052717 sulfur Inorganic materials 0.000 claims description 3
- 239000011593 sulfur Substances 0.000 claims description 3
- 239000003795 chemical substances by application Substances 0.000 claims description 2
- 238000005261 decarburization Methods 0.000 claims description 2
- 230000003247 decreasing effect Effects 0.000 claims description 2
- 238000002425 crystallisation Methods 0.000 claims 1
- 230000008025 crystallization Effects 0.000 claims 1
- 230000003009 desulfurizing effect Effects 0.000 claims 1
- 239000002893 slag Substances 0.000 claims 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims 1
- 238000003723 Smelting Methods 0.000 abstract description 3
- 238000007670 refining Methods 0.000 description 4
- 238000005275 alloying Methods 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 3
- 238000002474 experimental method Methods 0.000 description 3
- 230000004048 modification Effects 0.000 description 3
- 238000012986 modification Methods 0.000 description 3
- 235000013399 edible fruits Nutrition 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 230000004907 flux 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
- -1 0.0010%~0.0050% Chemical compound 0.000 description 1
- 238000005299 abrasion Methods 0.000 description 1
- 238000005266 casting Methods 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 230000001050 lubricating effect 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
- 238000004321 preservation Methods 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 238000002791 soaking Methods 0.000 description 1
- 238000005507 spraying 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
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- 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 kind of methods for producing punching press No yield point strip, for improving the mechanical property of punching press No yield point strip, and magnetic property are kept to be basically unchanged.The described method includes: smelting the molten iron of production punching press No yield point strip in converter；Molten steel vacuum circulation degassing method RH refines the molten steel of the converter output, obtains alloy；Wherein, the mass ratio of the alloy includes 0.0010%~0.0050% carbon, 2.5%~3.5% silicon, 0.3%~1.0% aluminium, 0.2%~1.0% manganese and the sulphur less than or equal to 0.01%；Continuous casting is carried out to the alloy, obtains slab；Slab described in hot rolling obtains hot rolled plate；Normalizing, pickling processes are carried out to the hot rolled plate in normalizing furnace, obtain normalizing plate；The normalizing plate described in cold rolling in mill obtains chill plate；Continuous annealing treatment is carried out to the chill plate；Belt steel surface after the annealing process coats half organic coating, obtains punching press No yield point strip.
Description
Technical field
The present invention relates to the field of metal processing more particularly to a kind of methods for producing punching press No yield point strip.
Background technique
The drawing velocity for improving process of producing product is very important for improving production efficiency.Such as drawing velocity by
260 beats/min are increased to 300 beats/min, and production efficiency can promote 15%.
However, the raising of drawing velocity is restricted by several factors, as punching machine Motor Capability, punching machine lubricating system ability,
Rotor detects speed, punching press mechanical property of No yield point strip etc..Wherein, the mechanical property shadow of punching press No yield point strip
Sound is more significant.The yield strength of strip is lower, then press machine burr is big, easy fracture；Strip yield strength is higher, then after punching press
Easily-deformable, punching machine abrasion is big.In addition, in the related art, while improving the mechanical property of punching press No yield point strip, holding
Easy strip magnetic property, and then influence the performance indicator of production product.
So the prior art has the mechanical property for how improving punching press No yield point strip, while keeping magnetic property base
This constant technical problem.
Summary of the invention
The embodiment of the invention provides a kind of methods for producing punching press No yield point strip, for improving punching press No yield point
The mechanical property of strip, and magnetic property is kept to be basically unchanged.
In a first aspect, the present invention provides a kind of methods for producing punching press No yield point strip, comprising:
The molten iron of production punching press No yield point strip is smelted in converter；
Molten steel vacuum circulation degassing method RH refines the molten steel of the converter output, obtains alloy；Wherein, the matter of the alloy
It measures and compares the carbon including 0.0010%~0.0050%, 2.5%~3.5% silicon, 0.3%~1.0% aluminium, 0.2%~1.0%
Manganese and sulphur less than or equal to 0.01%；
Continuous casting is carried out to the alloy, obtains slab；
Slab described in hot rolling obtains hot rolled plate；
Normalizing, pickling processes are carried out to the hot rolled plate in normalizing furnace, obtain normalizing plate；
The normalizing plate described in cold rolling in mill obtains chill plate；
Continuous annealing treatment is carried out to the chill plate；
Belt steel surface after the annealing process coats half organic coating, obtains punching press No yield point strip.
Optionally, normalizing, pickling processes are carried out to the hot rolled plate in normalizing furnace, obtain normalizing plate, comprising:
The hot rolled plate is conveyed into the normalizing furnace that furnace temperature is 800 DEG C~1000 DEG C and keeps the temperature the first duration.
Optionally, continuous annealing treatment is carried out to the chill plate, comprising:
The chill plate is conveyed into annealing furnace, makes the annealing of the chill plate at 900 DEG C~1150 DEG C of furnace temperature
The second duration is kept the temperature in furnace.
Optionally, the method also includes:
It is passed through full guard gas, in the furnace chamber of the annealing furnace to reduce the degree of oxidation of the chill plate.
Optionally, it is smelted in converter before producing molten iron of the punching press with No yield point strip, further includes:
Desulfurization process is carried out to the molten iron that will enter the converter, so that the sulfur content of the molten iron is less than or equal to
0.01%.
Optionally, during carrying out continuous casting to the alloy, control crystallizer is adjusted according to the liquid level of the alloy
Oscillation Amplitude.
Optionally, it is carried out in continuous casting process to the alloy, using non-orientation silicon steel mould flux to the slab
It is protected；
The slab thickness for the slab that the continuous 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, comprising:
1 slab is rolled in the first roughing mill of the roughing mills of Hot Rolling Mill；
5 slabs are rolled in the second roughing mill of the roughing mills.
Optionally, slab described in hot rolling obtains hot rolled plate, further includes:
The slab after transmission roughing passes sequentially through seven finishing mills of the mm finishing mill unit of Hot Rolling Mill, to the slab
7 finish rolling is carried out, the hot rolled plate is obtained；
The cooling hot rolled plate；The hot rolled plate of Hot Rolling Mill output with a thickness of 2.0mm~2.6mm.
Optionally, the normalizing plate described in cold rolling in mill obtains chill plate, comprising:
The normalizing plate described in 6 cold rollings repeatedly in the mill, by the normalizing plate be rolled into a thickness of
The chill plate of 0.35mm.
Said one or multiple technical solutions in the embodiment of the present application at least have following one or more technology effects
Fruit:
It include 0.0010%~0.0050% carbon using mass ratio in the technical solution of the embodiment of the present invention, 2.5%
The alloy production of~3.5% silicon, 0.3%~1.0% aluminium, 0.2%~1.0% manganese and the sulphur less than or equal to 0.01% is rushed
Pressure No yield point strip, improves the mechanical property for the punching press No yield point strip that final production goes out.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 fibr tissue become it is coarse again
Crystalline structure, crystallite dimension reach 120 μm~160 μm, improve the magnetic property of punching press No yield point strip, so, it realizes
While improving mechanical property, magnetic property is kept to be basically unchanged.
Further, it is annealed by 900 DEG C~1150 DEG C of annealing temperature, so that fibr tissue occurs to restore and tie again
Crystalline substance, and then crystallite dimension is controlled at 30 μm~50 μm, so that the punching press of the invention press machine made of No yield point strip carries out
Higher speed can be maintained when punching press, and is not susceptible to be broken, while strip magnetic property P1.5≤2.5W/kg, B50 >=
1.68T is maintained at higher level.
Specific embodiment
The embodiment of the invention provides a kind of methods for producing punching press No yield point strip, for improving punching press No yield point
The mechanical property of strip, and magnetic property is kept to be basically unchanged.
Technical solution of the present invention is described in detail below by specific embodiment, 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 to the limit of technical scheme
Fixed, in the absence of conflict, the technical characteristic in the embodiment of the present application and embodiment can be combined with each other.
The terms "and/or", only a kind of incidence relation for describing affiliated partner, indicates that there may be three kinds of passes
System, for example, A and/or B, can indicate: individualism A exists simultaneously A and B, these three situations of individualism B.In addition, herein
Middle character "/" typicallys represent the relationship that forward-backward correlation object is a kind of "or".
The production punching press method of No yield point strip provided by the invention, includes the following steps:
S101: the molten iron of production punching press No yield point strip is smelted in converter；
S102: molten steel vacuum circulation degassing method RH refines the molten steel of the converter output, obtains alloy；
S103: continuous casting is carried out to the alloy, obtains slab；
S104: slab described in hot rolling obtains hot rolled plate；
S105: carrying out normalizing, pickling processes to the hot rolled plate in normalizing furnace, obtains normalizing plate；
S016: the normalizing plate described in cold rolling in mill obtains chill plate；
S107: continuous annealing treatment is carried out to the chill plate；
S108: belt steel surface after the annealing process coats half organic coating, obtains punching press No yield point strip.
Optionally, before S101, further includes:
Desulfurization process is carried out to the molten iron that will enter the converter, so that the sulfur content of the molten iron is less than or equal to
0.01%.
Specifically, in embodiments of the present invention, desulfurization process is carried out to the molten iron that will enter converter before S101, it will
The sulphur S content of molten iron or the mass ratio of S are dropped below equal to 0.01%.Wherein, desulfurization method can be used in the prior art
Mode, the present invention just do not describe one by one.
Molten iron after desulfurization is poured into converter, wherein the converter in S101 can be 220 tons of converters, or its
The converter of his specification, the present invention are not particularly limited.In smelting process, constantly converter is heated, controls the molten iron in converter
Temperature is remained above equal to 1300 DEG C.
Molten iron after smelting is converted to molten steel, exports from converter.Further, in S102, using RH method (liquid vacuum cycle
Degassing method, RH-vacuum degassing are common by West Germany Rule iron company Ruhrstahl and He Laousi Hereaeus
A kind of molten steel secondary refining method designed and developed) alloying refining is carried out to molten steel.
In embodiments of the present invention, decarburization mode treatment is used first, reduces alloy carbon content.Then it is according to mass ratio
0.0010%~0.0050% carbon C, 2.5%~3.5% silicon Si, 0.3%~1.0% aluminium Al, 0.2%~1.0%
Manganese Mn and sulphur S less than or equal to 0.01%, remaining ingredient is iron Fe and the ratio of impurity carries out RH refining.It is eventually adding RH desulfurization
Excessive S is deviate from agent.
The alloy mass that RH refining obtains than carbon C, 2.5%~3.5% silicon Si for 0.0010%~0.0050%,
0.3%~1.0% aluminium Al, 0.2%~1.0% manganese Mn and the sulphur S less than or equal to 0.01%, remaining ingredient are iron 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 the mechanical property for improving final punching press No yield point strip.
Then, in S103, alloy is poured into continuous casting in conticaster, alloy is casting continuously to form slab.Specifically, of the invention
The crystallizer of conticaster in embodiment can adjust Oscillation Amplitude according to the case where alloy liquid level.Specifically, passing through crystallizer
In real time to level detection as a result, dynamic adjusts Oscillation Amplitude, and then the cooling velocity of adjusting alloying molten steel, guarantee liquid level stabilizing
Production.
Further, it in order to avoid alloy oxidation, is protected using the slab that non-orientation silicon steel mould flux goes out continuous casting
Shield.The slab thickness that continuous casting goes out in the embodiment of the present invention in 230mm~250mm, grow between 9.2m~10.2m by base.For example, plate
With a thickness of 230mm, 235mm, 240mm, 245mm or 250mm etc. after base；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 according to being actually configured, and the present invention is not particularly limited.
Next, carrying out hot rolling to slab in S104.Specifically, the Hot Rolling Mill in the embodiment of the present invention includes thick
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 is specifically included:
1 slab is rolled in the first roughing mill of the roughing mills of Hot Rolling Mill；
5 slabs are rolled in the second roughing mill of the roughing mills.
And S104 further include:
The slab after transmission roughing passes sequentially through seven finishing mills of the mm finishing mill unit of Hot Rolling Mill, to the slab
7 finish rolling is carried out, the hot rolled plate is obtained；
The cooling hot rolled plate；The hot rolled plate of Hot Rolling Mill output with a thickness of 2.0mm~2.6mm.
Specifically, slab is transferred to roughing 1 time in the first roughing mill of roughing mills first, is then transferred to again
Roughing 5 times in two roughing mills.In other words, slab is rolled using the mode of 1+5 in roughing.Then, slab is transmitted
To mm finishing mill unit, seven finishing mills are passed sequentially through.Every finishing mill is to slab finish rolling 1 time, in total to slab finish rolling 7 times.
Slab after hot rolling becomes hot rolled plate, and Hot Rolling Mill is exported after supercooling.In the embodiment of the present invention, Hot Rolling Mill
The hot rolling plate thickness of output 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, the hot rolled plate after finish rolling is cooled down using the refrigerating mode of section cooling.
Then, in S105, normalizing, pickling processes are carried out to hot rolled plate.In embodiments of the present invention, S105 is specifically wrapped
It includes:
The hot rolled plate is conveyed into the normalizing furnace that furnace temperature is 800 DEG C~1000 DEG C and keeps the temperature the first duration.
Specifically, in order to keep the magnetic property of impact No yield point strip, the furnace temperature of normalizing furnace is turned up to 800 DEG C
~1000 DEG C.During specific implementation, can be specifically set for 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 according to being actually configured, the present invention
It does not do specific present.
Further, a length of first duration when heat preservation of the hot rolled plate in normalizing furnace.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 treatment, so that hot rolled plate fibr tissue becomes coarse recrystallization group
It knits, is tested by experiment, crystallite dimension reaches 120 μm~160 μm.Therefore, preferable magnetic property is maintained.
Further, the hot rolled plate after water-spraying control normalizing treatment and S105 are sour to hot rolled plate progress ball blast using hydrochloric acid
It washes.Further, the hot rolled plate in S106 after cold rolling normalizing treatment, specifically includes:
The normalizing plate described in 6 cold rollings repeatedly in the mill, by the normalizing plate be rolled into a thickness of
The chill plate of 0.35mm.
Specifically, the normalizing plate after pickling is transferred in mill.Also, enter by 6 circle transmissions and
Mill is transmitted out, and then enables normalizing plate by mill repeat-rolling 6 times.In embodiments of the present invention, it rolls
Normalizing plate thickness after system 6 times is reduced to 0.35mm, becomes chill.
Then, it anneals in S107 to chill plate.It is made annealing treatment in the embodiment of the present invention specifically:
The chill plate is conveyed into annealing furnace, makes the annealing of the chill plate at 900 DEG C~1150 DEG C of furnace temperature
The second duration is kept the temperature in furnace.
Specifically, chill plate is passed in annealing furnace from the entrance of 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
On entrance to export direction, it is gradually increased to the highest temperature, is then gradually decreased from the highest temperature.Therefore, chill plate is incoming from entrance,
Temperature will also be gradually increased to the highest temperature, then gradually decrease, and finally spread out of from outlet.
In addition, the soaking time of chill plate in the lehr is the second duration, spread out of that is, being passed to from entrance 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 are not done specifically
Limitation.
It further, in embodiments of the present invention, will be in the furnace chamber of annealing furnace in order to avoid excessive oxidation in annealing process
It is passed through full guard gas.
It is tested so that Recovery and recrystallization occurs for dimension tissue by experiment by 900 DEG C~1150 DEG C of high annealing,
Crystallite dimension reaches 30 μm~50 μm.Therefore, preferable magnetic property is maintained.
Finally, belt steel surface after annealing coats upper half organic coating in S108, punching press No yield point band is obtained
Steel.
It is tested by experiment, the punching press produced using the method for the embodiment of the present invention is big with the yield strength of No yield point strip
In being 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 existing skill
The yield strength of the punching press produced in art No yield point strip is more than or equal to 350MPa, and tensile strength is more than or equal to 470MPa, iron
Damage P1.5≤2.7W/kg, magnetic strength B50 >=1.67T.As it can be seen that the punching press No yield point of method production through the embodiment of the present invention
The mechanical property of strip is higher than the prior art, and magnetic property is also superior to the prior art.
Said one or multiple technical solutions in the embodiment of the present application at least have following one or more technology effects
Fruit:
It include 0.0010%~0.0050% carbon using mass ratio in the technical solution of the embodiment of the present invention, 2.5%
The alloy production of~3.5% silicon, 0.3%~1.0% aluminium, 0.2%~1.0% manganese and the sulphur less than or equal to 0.01% is rushed
Pressure No yield point strip, improves the mechanical property for the punching press No yield point strip that final production goes out.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 fibr tissue become it is coarse again
Crystalline structure, crystallite dimension reach 120 μm~160 μm, improve the magnetic property of punching press No yield point strip, so, it realizes
While improving mechanical property, magnetic property is kept to be basically unchanged.
Further, it is annealed by 900 DEG C~1150 DEG C of annealing temperature, so that fibr tissue occurs to restore and tie again
Crystalline substance, and then crystallite dimension is controlled at 30 μm~50 μm, so that the punching press of the invention press machine made of No yield point strip carries out
Higher speed can be maintained when punching press, and is not susceptible to be broken, while strip magnetic property P1.5≤2.5W/kg, B50 >=
1.68T is maintained at higher level.
Obviously, various changes and modifications can be made to the invention without departing from essence of the invention by those skilled in the art
Mind and range.In this way, if these modifications and changes of the present invention belongs to the range of the claims in the present invention and its equivalent technologies
Within, then the present invention is also intended to include these modifications and variations.
Claims (6)
1. a kind of method for producing punching press No yield point strip characterized by comprising
Desulfurization process is carried out to the molten iron that will enter converter, so that the sulfur content of the molten iron is less than or equal to 0.01%；
The molten iron of production punching press No yield point strip is smelted in converter；
Using decarburization mode treatment, alloy carbon content is reduced, molten steel vacuum circulation degassing method RH refines the steel of the converter output
Water is added RH desulfurizing agent and deviates from excessive S, obtains alloy；Wherein, the mass ratio of the alloy include 0.0010%~
0.0050% carbon, 2.5%~3.5% silicon,
0.3%~1.0% aluminium, 0.2%~1.0% manganese and the sulphur less than or equal to 0.01%；
Continuous casting is carried out to the alloy, obtains slab, is carried out in continuous casting process to the alloy, it is dedicated using non-orientation silicon steel
Covering slag protects the slab；The slab thickness for the slab that the continuous casting process obtains is 230mm~250mm,
A length of 9.2m~the 10.2m of base；
Slab described in hot rolling obtains hot rolled plate, and specifically include: Hot Rolling Mill includes roughing mills and mm finishing mill unit, the roughing
Unit includes two different roughing mills of precision, and mm finishing mill unit includes continuous five finishing mills, the of the roughing mills
1 slab is rolled in one roughing mill, 5 slabs are rolled in the second roughing mill of the roughing mills, and transmission is thick
The slab after rolling passes sequentially through seven finishing mills of the mm finishing mill unit of Hot Rolling Mill, carries out 7 finish rolling to the slab, obtains
Obtain the hot rolled plate；
The hot rolled plate after finish rolling is cooled down using the refrigerating mode of section cooling, the hot rolled plate is carried out in normalizing furnace
Normalizing carries out ball blast pickling processes to hot rolled plate using hydrochloric acid, obtains normalizing plate；
The normalizing plate described in cold rolling in mill obtains chill plate；
Continuous annealing treatment is carried out to the chill plate；
Belt steel surface after the annealing process coats half organic coating, obtains punching press No yield point strip；
Wherein, described that normalizing, pickling processes are carried out to the hot rolled plate in normalizing furnace, obtain normalizing plate, comprising:
The hot rolled plate is conveyed into the normalizing furnace that furnace temperature is 800 DEG C~1000 DEG C and keeps the temperature the first duration, wherein the first duration
For 55S~65S；
And it is made annealing treatment by 900 DEG C~1150 DEG C of temperature, and the temperature in annealing furnace is in direction from the inlet to the outlet
On, it is gradually increased to the highest temperature, is then gradually decreased from the highest temperature.
2. the method as described in claim 1, which is characterized in that carry out continuous annealing treatment to the chill plate, comprising:
The chill plate is conveyed into annealing furnace, makes the chill plate in 900 DEG C~1150 DEG C of furnace temperature of the annealing furnace
Keep the temperature the second duration.
3. method according to claim 2, which is characterized in that the method also includes:
It is passed through full guard gas, in the furnace chamber of the annealing furnace to reduce the degree of oxidation of the chill plate.
4. method as claimed in claim 3, which is characterized in that during carrying out continuous casting to the alloy, control crystallization
Device adjusts Oscillation Amplitude according to the liquid level of the alloy.
5. method as claimed in claim 4, which is characterized in that slab described in hot rolling obtains hot rolled plate, further includes:
The cooling hot rolled plate；The hot rolled plate of Hot Rolling Mill output with a thickness of 2.0mm~2.6mm.
6. method as claimed in claim 5, which is characterized in that the normalizing plate described in cold rolling in mill obtains chill
Plate, comprising:
The normalizing plate described in 6 cold rollings repeatedly in the mill, the normalizing plate is rolled into a thickness of 0.35mm's
The chill plate.
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| BR112019021222B1 (en) * | 2017-07-19 | 2023-10-31 | Nippon Steel Corporation | NON-ORIENTED ELECTRIC STEEL SHEET |
| CN111996353A (en) * | 2020-08-03 | 2020-11-27 | 鞍钢股份有限公司 | High-efficiency production method of electrical steel |
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