CN107513671B - Steel plate for shield and preparation method thereof - Google Patents
Steel plate for shield and preparation method thereof Download PDFInfo
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- CN107513671B CN107513671B CN201710597125.0A CN201710597125A CN107513671B CN 107513671 B CN107513671 B CN 107513671B CN 201710597125 A CN201710597125 A CN 201710597125A CN 107513671 B CN107513671 B CN 107513671B
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- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 59
- 239000010959 steel Substances 0.000 title claims abstract description 59
- 238000002360 preparation method Methods 0.000 title claims abstract description 20
- 239000000126 substance Substances 0.000 claims abstract description 12
- 239000012535 impurity Substances 0.000 claims abstract description 4
- 238000010438 heat treatment Methods 0.000 claims description 52
- 238000010583 slow cooling Methods 0.000 claims description 23
- 230000006698 induction Effects 0.000 claims description 21
- 238000010791 quenching Methods 0.000 claims description 18
- 230000000171 quenching effect Effects 0.000 claims description 17
- 238000005096 rolling process Methods 0.000 claims description 14
- 238000005496 tempering Methods 0.000 claims description 14
- XEEYBQQBJWHFJM-UHFFFAOYSA-N iron Substances [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 11
- 238000001816 cooling Methods 0.000 claims description 10
- 238000002791 soaking Methods 0.000 claims description 9
- 238000012545 processing Methods 0.000 claims description 8
- 238000009933 burial Methods 0.000 claims description 6
- 238000007670 refining Methods 0.000 claims description 6
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 5
- 238000003723 Smelting Methods 0.000 claims description 4
- 229910052742 iron Inorganic materials 0.000 claims description 4
- 238000009749 continuous casting Methods 0.000 claims description 3
- 238000003303 reheating Methods 0.000 claims description 2
- 238000004519 manufacturing process Methods 0.000 abstract description 12
- 239000000463 material Substances 0.000 description 20
- 238000000034 method Methods 0.000 description 12
- 239000011572 manganese Substances 0.000 description 11
- 239000010936 titanium Substances 0.000 description 9
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 8
- 229910052748 manganese Inorganic materials 0.000 description 6
- 238000001556 precipitation Methods 0.000 description 6
- 229910052757 nitrogen Inorganic materials 0.000 description 5
- 229910052719 titanium Inorganic materials 0.000 description 5
- PWHULOQIROXLJO-UHFFFAOYSA-N Manganese Chemical compound [Mn] PWHULOQIROXLJO-UHFFFAOYSA-N 0.000 description 4
- 150000001875 compounds Chemical class 0.000 description 4
- 230000000694 effects Effects 0.000 description 4
- 238000004321 preservation Methods 0.000 description 4
- 238000005728 strengthening Methods 0.000 description 4
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 3
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 description 3
- 229910045601 alloy Inorganic materials 0.000 description 3
- 239000000956 alloy Substances 0.000 description 3
- 239000004411 aluminium Substances 0.000 description 3
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 3
- 229910052782 aluminium Inorganic materials 0.000 description 3
- 229910001566 austenite Inorganic materials 0.000 description 3
- 229910001563 bainite Inorganic materials 0.000 description 3
- 229910052799 carbon Inorganic materials 0.000 description 3
- 229910052804 chromium Inorganic materials 0.000 description 3
- 229910000734 martensite Inorganic materials 0.000 description 3
- 229910052759 nickel Inorganic materials 0.000 description 3
- 229910052698 phosphorus Inorganic materials 0.000 description 3
- 229910052710 silicon Inorganic materials 0.000 description 3
- 239000010703 silicon Substances 0.000 description 3
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 description 2
- 239000005864 Sulphur Substances 0.000 description 2
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 description 2
- 238000005452 bending Methods 0.000 description 2
- 239000013078 crystal Substances 0.000 description 2
- 238000004090 dissolution Methods 0.000 description 2
- 230000007613 environmental effect Effects 0.000 description 2
- 239000004615 ingredient Substances 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 229910052758 niobium Inorganic materials 0.000 description 2
- 239000011574 phosphorus Substances 0.000 description 2
- 230000003014 reinforcing effect Effects 0.000 description 2
- 229910052717 sulfur Inorganic materials 0.000 description 2
- 230000009466 transformation Effects 0.000 description 2
- 229910052720 vanadium Inorganic materials 0.000 description 2
- ATJFFYVFTNAWJD-UHFFFAOYSA-N Tin Chemical compound [Sn] ATJFFYVFTNAWJD-UHFFFAOYSA-N 0.000 description 1
- 230000002411 adverse Effects 0.000 description 1
- 238000005275 alloying Methods 0.000 description 1
- 238000005255 carburizing Methods 0.000 description 1
- 239000004568 cement Substances 0.000 description 1
- 229910001567 cementite Inorganic materials 0.000 description 1
- 238000005520 cutting process Methods 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000005713 exacerbation Effects 0.000 description 1
- 238000000265 homogenisation Methods 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- KSOKAHYVTMZFBJ-UHFFFAOYSA-N iron;methane Chemical compound C.[Fe].[Fe].[Fe] KSOKAHYVTMZFBJ-UHFFFAOYSA-N 0.000 description 1
- 230000000670 limiting effect Effects 0.000 description 1
- 150000001247 metal acetylides Chemical class 0.000 description 1
- 238000003801 milling Methods 0.000 description 1
- 229920001296 polysiloxane Polymers 0.000 description 1
- 230000001376 precipitating effect Effects 0.000 description 1
- 230000001681 protective effect Effects 0.000 description 1
- 230000002829 reductive effect Effects 0.000 description 1
- 230000000717 retained effect Effects 0.000 description 1
- 239000011593 sulfur Substances 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
- 238000012876 topography Methods 0.000 description 1
- 229910000859 α-Fe Inorganic materials 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
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
- C22C38/54—Ferrous alloys, e.g. steel alloys containing chromium with nickel with boron
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21C—MANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES OR PROFILES, OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
- B21C37/00—Manufacture of metal sheets, bars, wire, tubes or like semi-manufactured products, not otherwise provided for; Manufacture of tubes of special shape
- B21C37/02—Manufacture of metal sheets, bars, wire, tubes or like semi-manufactured products, not otherwise provided for; Manufacture of tubes of special shape of sheets
-
- 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
- C21D8/0247—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the heat treatment
- C21D8/0263—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the heat treatment following hot rolling
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C33/00—Making ferrous alloys
- C22C33/04—Making ferrous alloys by melting
-
- 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
- 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
-
- 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
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
- C22C38/50—Ferrous alloys, e.g. steel alloys containing chromium with nickel with titanium or zirconium
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)
- Heat Treatment Of Sheet Steel (AREA)
Abstract
The invention discloses a steel plate for a shield and a preparation method thereof, and belongs to the technical field of steel plate production. The steel plate comprises the following chemical components in percentage by weight: c: 0.35-0.43%; si: 0.20-0.40%; mn: 1.2-1.5%; ti: 0.02-0.04%; al: 0.01-0.06%; ni: 0 to 0.4 percent; cr: 0 to 0.5 percent; p: less than or equal to 0.01 percent; s: less than or equal to 0.004 percent; n: less than or equal to 0.008 percent; b: 0.0010-0.0030%; the balance of Fe and inevitable impurities. The steel plate for the shield and the preparation method thereof enable the strength grade of the steel plate to reach 1500MPa, have good cold forming performance and excellent bulletproof performance, and are suitable for production of the shield.
Description
Technical field
The present invention relates to Plate Production technical field, in particular to a kind of shield steel plate and preparation method thereof.
Background technique
A kind of hand-held lattice gear, to shelter body, resists the weapons attack such as enemy's arms, arrows and stones when shield is fought in ancient times
Defensive ordnance, be rectangle or round, the center of size etc., shield outwardly protrudes, and is similar to the curvature of the spinal column, and inner face has several systems
Band referred to as " is handed in hand ", is grasped when to use.And present, shield also has very big effect, in the safety such as anti-riot, shellproof
Field, shield still play the role of very big, and still, the cold formability of steel plate in the prior art can be poor, and bending is easy to crack, and shield
Board production will carry out cold bending, and the steel plate of the prior art is not particularly suited for production shield.
Summary of the invention
The present invention provides a kind of shield steel plate and preparation method thereof, solves or part solves steel in the prior art
Plate is not particularly suited for the technical issues of production shield.
In order to solve the above technical problems, the chemical component of the steel plate is by weight the present invention provides a kind of shield steel plate
Measure percentage are as follows: C:0.35~0.43%；Si:0.20-0.40%；Mn:1.2~1.5%；Ti:0.02~0.04%；Al:
0.01~0.06%；Ni:0~0.4%；Cr:0~0.5%；P :≤0.01%；S :≤0.004%；N :≤0.008%；B:
0.0010-0.0030%；Remaining is Fe and inevitable impurity.
Further, the steel plate with a thickness of 2-8mm.
Another aspect of the invention provides a kind of preparation method of shield steel plate, comprising the following steps: lead to molten iron
It crosses converter or electric furnace smelting, LF refining or RH refining obtains continuous casting acquisition slab after molten steel；The slab is subjected to heating furnace again
After heating, hot rolled plate is obtained using roughing, finish rolling；After the hot rolled plate is carried out section cooling, obtained in rolls using curling
Obtain coil of strip；The coil of strip is subjected to slow cooling, obtains finished product using continuous heat；Wherein, the slab adds in heating furnace
To 1220~1300 DEG C, heating time is greater than 210 minutes heat, and the workpiece thickness for carrying out the slab of roughing, finish rolling uses 5
Times~10 times of finished product thicknesses, entry temperature at finishing be 1000 DEG C~1100 DEG C, finishing temperature be 830~880 DEG C, the coil of strip into
Row slow cooling carries out section cooling using leading portion refrigerating mode, and target coiling temperature is 650 DEG C~750 DEG C.
Further, slow cooling processing is carried out using burial pit after the coil of strip is offline, slow cooling time is greater than 72 hours, coil of strip
Go out to cheat at extremely≤150 DEG C of slow cooling.
Further, it includes: the coil of strip after slow cooling to be carried out uncoiling, then carry out that the coil of strip, which carries out continuous heat,
Aligning；The coil of strip after aligning is subjected to high-frequency induction heating, is then quenched, then carry out induction tempering heating；It will sense
Coil of strip progress after should being tempered is crosscutting, obtains the finished product.
Further, the coil of strip carries out continuous high frequency induction heating, and heating temperature is 850-950 DEG C, and the rate of heat addition is big
In 100 DEG C per second.
Further, the coil of strip after high-frequency induction heating is kept the temperature, soaking time was less than 10 minutes.
Further, coil of strip after heating is quenched, using water quenching, target temperature is room temperature.
Further, high-frequency induction tempering heating is carried out to coil of strip after quenching, heating temperature is 250~450 DEG C, heating speed
Rate is greater than 100 DEG C per second.
Further, to tempering heating after coil of strip keep the temperature, soaking time less than 20 minutes, after be air-cooled to room temperature.
The present invention provides a kind of shield steel plates and preparation method thereof, and C chemical component by weight hundred is added in steel plate
Divide than being 0.35~0.43%, Mn chemical component is 1.2~1.5% by weight percentage, and Si chemical component is by weight percentage
For 0.20-0.40%, alloy aspect is strengthened using the compound addition of Ni, Cr, and addition B enhances harden ability, gives full play to build up,
Again by roughing, finish rolling, continuous heat process modification, produce suitable for shield steel plate, steel plate has good anti-
Elastic energy, cold formability energy and low-temperature impact toughness, the shield steel plate produced, tensile strength are greater than 1500MPa, elongation percentage
Greater than 8%, -20 DEG C ballistic work is greater than 40J, and 180 ° of clod wash B=35mm/D=6a do not crack, and material has good shellproof simultaneously
Performance.
Detailed description of the invention
Fig. 1 is the metallographic structure figure of shield steel plate provided in an embodiment of the present invention.
Specific embodiment
Referring to Fig. 1, a kind of shield steel plate provided in an embodiment of the present invention, the chemical component of steel plate percentage by weight
Than are as follows: C:0.35~0.43%；Si:0.20-0.40%；Mn:1.2~1.5%；Ti:0.02~0.04%；Al:0.01~
0.06%；Ni:0~0.4%；Cr:0~0.5%；P :≤0.01%；S :≤0.004%；N :≤0.008%；B:0.0010-
0.0030%；Remaining is Fe and inevitable impurity.The steel plate with a thickness of 2-8mm.
Carbon: carbon plays a significant role in heat treatment high-strength steel, is on the one hand remarkably improved the strong of material by adding C
Degree improves bulletproof ability, but low-temperature impact toughness and solderability to guarantee material, needs to do bound clearly limiting, this
The carbon content that uses is invented as 0.35~0.43%.
Silicon: silicon is solution strengthening element, but the excessively high silicon of addition can have a negative impact to the plasticity of material.Present invention addition
Silicone content is 0.20-0.40%%.
Manganese: manganese has solution strengthening effect, while material harden ability can be improved, be improve strength of materials important element it
One, but excessively high be easy to produce of manganese content addition is segregated and can reduce toughness of material, deteriorates performance.The present invention adds manganese content
1.2~1.4%.
Sulphur and phosphorus: sulphur and P elements are excessively high to adversely affect to toughness of material and plasticity.Present invention defines sulfur contents
It should control within 0.004%, phosphorus content should control within 0.01%.
Aluminium: aluminium is deoxidant element, while having certain grain refining effect.It is 0.01% present invention defines aluminium content
~0.06%.
Titanium: the main function of titanium is fixed nitrogen in the present invention, reduces the N to dissociate in steel by forming TiN, improves materials'use
Performance；In addition, extra Ti in conjunction with C, plays the role of precipitation strength, but the precipitation strength of TiC can be to the low-temperature impact of material
Toughness causes damages, therefore needs upper control limit.The present invention adds 0.02-0.04%Ti.
Cr: the purpose that Cr is added in the present invention is to improve the integral strength of material；The present invention adds 0~0.5%Cr.
Ni: the purpose that Ni is added in the present invention is to improve the toughness of material, improves ballistic performance, present invention addition 0~0.4%
Ni。
Nitrogen: the plasticity and toughness of the excessively high meeting severe exacerbation material of nitrogen content, especially for heat treatment high-strength steel, therefore,
The present invention, which limits nitrogen content, should be less than 0.008%.
It is 0.35~0.43%, Mn chemistry that technical scheme adds C chemical component in steel plate by weight percentage
Ingredient is 1.2~1.5% by weight percentage, is strengthened in terms of alloy using the compound addition of Ni, Cr, and addition B enhances harden ability, is filled
Build up is waved in distribution, then by roughing, finish rolling, continuous heat process modification, produce suitable for shield steel plate, steel
Plate has good ballistic performance, cold formability energy and low-temperature impact toughness, the shield steel plate produced, and tensile strength is greater than
1500MPa, elongation percentage are greater than 8%, and -20 DEG C of ballistic works are greater than 40J, and 180 ° of clod wash B=35mm/D=6a do not crack, and material is simultaneously
With good ballistic performance.
Shield described herein steel plate chemical component use in low C, low Si, low Mn design, in terms of alloy using Ni,
The compound addition of Cr is strengthened, and addition B enhances harden ability.
The ingredient mentality of designing of low C, low Mn, give full play to build up, produce suitable for shield in the application use
Armour plate, material have good ballistic performance, cold formability energy and low-temperature impact toughness, can be used for producing steel shield
Board.
The controlling of production process main points that the application uses are smelting process strict control P, S, N content guarantee slab matter
Amount.
Another aspect of the invention provides a kind of preparation method for producing above-mentioned shield steel plate, comprising the following steps:
Step 1, continuous casting obtains slab after molten iron being obtained molten steel by converter or electric furnace smelting, LF refining or RH refining.
Step 2, after the slab being carried out heating furnace reheating, hot rolled plate is obtained using roughing, finish rolling.
Step 3, after the hot rolled plate being carried out section cooling, coil of strip is obtained using curling is coiled.
Step 4, the coil of strip is subjected to slow cooling, obtains finished product using continuous heat.
Wherein, specific process parameter control is as follows:
The slab is heated to 1220~1300 DEG C in heating furnace, and heating time is greater than 210 minutes, is added using higher
The purpose of hot temperature is the more abundant of the compound dissolution for guaranteeing to be formed in austenite homogenization and alloying element such as slab.
The workpiece thickness for carrying out the slab of roughing, finish rolling uses 5 times~10 times finished product thicknesses, guarantees to have enough
Austenite Unhydrated cement drafts, be conducive to refine crystal grain；Intermediate base length can be shortened simultaneously by increasing workpiece thickness,
It is poor into finish rolling head and tail temperature to reduce, prevent tail temperature from reducing excessive increase mill load.Entry temperature at finishing is 1000
DEG C~1100 DEG C, it is obtain fine uniform crystal grain effective using lower finish rolling area temperature that finishing temperature, which is 830~880 DEG C,
Method avoids the appearance of hot-rolled coil organizational coarseness and banded structure.
The coil of strip carries out slow cooling and carries out section cooling using leading portion refrigerating mode, and target coiling temperature is 650 DEG C~750
℃.On the one hand be conducive to reinforce the build up after phase transformation, be on the other hand conducive to enhance precipitating reinforcing effect, obtain more iron
Tiny precipitation product in ferritic, to effectively improve the strength of materials.The target coiling temperature that the present invention uses for 650 DEG C~
750 DEG C, the alternate precipitation and the precipitation in ferrite for being mainly in view of V, Nb, Ti, coiling temperature lower limit need strict control big
In 650 DEG C, avoids occurring bainite structure in hot-rolled coil, influence strip shape quality.
The coil of strip it is offline after using burial pit carry out slow cooling processing, slow cooling time be greater than 72 hours, coil of strip slow cooling to≤
Go out to cheat at 150 DEG C.Slow cooling is carried out to coil of strip using burial pit, the logical volume mechanical property of material can be made more uniform, and can be with
Effectively internal stress is made to be released and homogenize, so as to improve strip shape quality, is conducive to subsequent heat treatment plate shape and residual stress
Control.
Step 4 is discussed in detail.
The coil of strip carries out continuous heat
Step 41, the coil of strip after slow cooling is subjected to uncoiling, then is aligned.
Step 42, the coil of strip after aligning is subjected to high-frequency induction heating, is then quenched, then carry out induction tempering
Heating.
Step 43, the coil of strip progress after induction tempering is crosscutting, obtain the finished product.
Wherein, it is as follows to carry out the control of continuous heat specific process parameter for the coil of strip:
The coil of strip carries out continuous high frequency induction heating, and heating temperature is 850-950 DEG C, and the rate of heat addition is greater than per second 100
℃.It is to control quenched martensite tissue topography using the purpose of high-frequency induction heating, improves the rate of heat addition and be conducive to quench
To more tiny martensite and lath of bainite, and be conducive to control morphology of carbides in quenching structure.
Coil of strip after high-frequency induction heating is kept the temperature, soaking time was less than 10 minutes.Soaking time is controlled, can be reduced
Austenite Grain Growth, and prevent the carbide dissolution of V, Ti, Nb in hot-rolled coil；Steel plate after heating and thermal insulation is quenched
Processing, using water quenching, target temperature is room temperature, and tiny martensite+bainite structure can be obtained after quenching.
Coil of strip after heating is quenched, using water quenching, target temperature is room temperature.High frequency is carried out to coil of strip after quenching
Induction tempering heating, heating temperature are 250~450 DEG C, and the rate of heat addition is greater than 100 DEG C per second.Coil of strip after tempering heating is carried out
Heat preservation, soaking time less than 20 minutes, after be air-cooled to room temperature.It is to control the carburizing bodily form using the purpose that induction is quickly heated
Looks；Steel plate after tempering heating is kept the temperature, soaking time was less than 20 minutes, when being kept the temperature by quickly heating with strict control
Between, the tiny cementite being discontinuously distributed can be obtained, the precipitation of Ti is retained, and the intensity of material is improved.Using in 250-450 DEG C
High tempering, at the same be conducive to eliminate steel plate residual stress, be conducive to control material unevenness and guarantee blanking after it is indeformable,
Solve the problems, such as that shield steel-plate shape is more serious in the prior art, steel plate wave occurs during quenching after rolling or out-line quenching
The technical issues of shape, the plate shape problem of press quenching technique can not solve, not be suitable for mass production.
Existing shield production technology generally uses hot forming to cooperate press quenching technique, which needs to heat due to steel plate
Heat preservation needs to equip using press quenching, due to needing to be unfavorable for environmental protection, production equipment using heating furnace so production efficiency is low
Limitation is clearly.And shield of the present invention steel is used to produce shield, directly it is bent into using cold after steel plate cutting
Shape does not need to equip using hot forming and press quenching, and high production efficiency, clean and environmental protection, performance is uniform, and quality is steady
It is fixed.
Each controlled rolling and cooling process parameter of operation of rolling strict control, coil of strip batch laggard burial pit and carry out slow cooling processing, can
Improve the performance uniformity and strip shape quality of hot-rolled coil.
In order to become apparent from the embodiment of the present invention, introduced from the application method of the embodiment of the present invention below.
Shield is shown in Table 1 with the weight percent of the chemical component of steel plate element:
| Serial number | C | Si | Mn | P | S | Ti | Cr | Ni | B | N |
| 1 | 0.38 | 0.20 | 1.22 | 0.009 | 0.002 | 0.020 | 0.30 | 0.25 | 0.0025 | 0.003 |
| 2 | 0.36 | 0.24 | 1.25 | 0.008 | 0.002 | 0.025 | 0.25 | 0.30 | 0.0022 | 0.003 |
| 3 | 0.40 | 0.29 | 1.30 | 0.010 | 0.001 | 0.030 | 0.28 | 0.30 | 0.0026 | 0.004 |
| 4 | 0.42 | 0.30 | 1.38 | 0.008 | 0.002 | 0.035 | 0.20 | 0.35 | 0.0018 | 0.003 |
| 5 | 0.39 | 0.33 | 1.25 | 0.008 | 0.002 | 0.025 | 0.30 | 0.20 | 0.0020 | 0.003 |
1 shield of table steel plate specific embodiment chemical component
The preparation method is as follows:
S2: being put into heating furnace for slab and heat, and controls heating temperature and soaking time.
S3: being put into milling train for the slab after heating and roll, and controls finish rolling inlet and outlet temperatures, obtains target thickness
Steel plate.
S4: cooling down hot rolled plate, carries out section cooling using leading portion refrigerating mode, hot rolled plate after cooling is carried out
It batches, obtains steel plate finished product；Target oiler temperature control in coiling process is 650-750 DEG C；The thick 2-8mm of steel plate finished product.
S5: carrying out slow cooling processing using burial pit after offline to hot-rolled sheet coil, and slow cooling time is greater than 72 hours, coil of strip slow cooling
Go out to cheat at extremely≤150 DEG C.
S6: continuous high frequency induction heating and heat preservation, rear water quenching to room temperature are carried out to coil of strip.
S7: carrying out induction tempering heating and heat preservation to steel plate after quenching, after be air-cooled to room temperature.
The specific processing parameter of 1-5 embodiment is shown in Table 2:
2 shield of table steel plate embodiment processing parameter
The mechanical property of shield steel plate is shown in Table 3 after the heat treatment of 1-5 embodiment:
3 shield of table steel plate embodiment performance
Target practice test carried out to 1-5 embodiment, specific shooting scheme and the results are shown in Table 4:
The specific shooting scheme of table 4 and result
The ratio of shield provided by the invention steel plate chemical component gives full play to the reinforcing such as solution strengthening, phase transformation strengthening
Effect enables the steel plate finished product finally obtained to have good intensity, toughness, cold formability and strip shape quality.Material has
Simultaneously, it is each to be suitable for GA423-2015 " police missile-resistant shield " to excellent comprehensive mechanical property for the protective performance with superelevation
The protection of rank.
It should be noted last that the above specific embodiment is only used to illustrate the technical scheme of the present invention and not to limit it,
Although being described the invention in detail referring to example, those skilled in the art should understand that, it can be to the present invention
Technical solution be modified or replaced equivalently, without departing from the spirit and scope of the technical solution of the present invention, should all cover
In the scope of the claims of the present invention.
Claims (9)
1. a kind of preparation method of shield steel plate, the chemical component of the shield steel plate is by weight percentage are as follows: C:0.35
~0.43%；Si:0.20-0.40%；Mn:1.2~1.5%；Ti:0.02~0.04%；Al:0.01~0.06%；Ni:0~0.4%；
Cr:0~0.5%；P :≤0.01%；S :≤0.004%；N :≤0.008%；B:0.0010-0.0030%；Remaining is Fe and can not keep away
Exempt from impurity；It is characterized in that, the preparation method comprises the following steps:
Molten iron is obtained into slab by continuous casting after converter or electric furnace smelting, LF refining or RH refined molten steel；
After the slab is carried out heating furnace reheating, hot rolled plate is obtained using roughing, finish rolling；
After the hot rolled plate is carried out section cooling, coil of strip is obtained using curling is coiled；
The coil of strip is subjected to slow cooling, obtains finished product using continuous heat；
Wherein, the slab is heated to 1220~1300 DEG C in heating furnace, and heating time is greater than 210 minutes, carries out roughing, essence
The workpiece thickness of the slab rolled uses 5 times~10 times finished product thicknesses, and entry temperature at finishing is 1000 DEG C~1100 DEG C, eventually
Rolling temperature is 830~880 DEG C, and the coil of strip carries out slow cooling and carries out section cooling, target coiling temperature using leading portion refrigerating mode
It is 650 DEG C~750 DEG C.
2. preparation method according to claim 1, it is characterised in that:
Slow cooling processing is carried out using burial pit after the coil of strip is offline, slow cooling time is greater than 72 hours, and coil of strip slow cooling is to≤150 DEG C
When go out cheat.
3. preparation method according to claim 1, which is characterized in that the coil of strip carries out continuous heat and includes:
The coil of strip after slow cooling is subjected to uncoiling, then is aligned；
The coil of strip after aligning is subjected to high-frequency induction heating, is then quenched, then carry out induction tempering heating；
Coil of strip progress after induction tempering is crosscutting, obtain the finished product.
4. preparation method according to claim 3, it is characterised in that:
The coil of strip carries out continuous high frequency induction heating, and heating temperature is 850-950 DEG C, and the rate of heat addition is greater than 100 DEG C per second.
5. preparation method as claimed in claim 4, it is characterised in that:
Coil of strip after high-frequency induction heating is kept the temperature, soaking time was less than 10 minutes.
6. preparation method as claimed in claim 3, it is characterised in that:
Coil of strip after heating is quenched, using water quenching, target temperature is room temperature.
7. preparation method as claimed in claim 3, it is characterised in that:
High-frequency induction tempering heating is carried out to coil of strip after quenching, heating temperature is 250~450 DEG C, and the rate of heat addition is greater than per second 100
℃。
8. preparation method as claimed in claim 7, it is characterised in that:
To tempering heating after coil of strip keep the temperature, soaking time less than 20 minutes, after be air-cooled to room temperature.
9. preparation method according to claim 1, it is characterised in that:
The steel plate with a thickness of 2-8mm.
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| CN109930069B (en) * | 2019-03-28 | 2019-12-24 | 北京科技大学 | Manufacturing method of light steel plate with ultrahigh strength and high toughness |
| CN112974562B (en) * | 2021-03-31 | 2023-04-07 | 甘肃酒钢集团宏兴钢铁股份有限公司 | Production method of stainless steel hot-rolled coil for welding strip |
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| JPS5844146B2 (en) * | 1976-02-06 | 1983-10-01 | 株式会社東芝 | magnetic material |
| CN1102671C (en) * | 2000-12-25 | 2003-03-05 | 钢铁研究总院 | High-performance impact resisting steel |
| CN101613841A (en) * | 2009-07-16 | 2009-12-30 | 首钢总公司 | Revolving furnace continuous casting little square billet ultra-high strength and toughness tunnel supporting anchor rod steel and production method |
| CN101928891A (en) * | 2010-08-23 | 2010-12-29 | 首钢总公司 | Wearable steel plate with low cost and high strength and producing method thereof |
| CN103205634B (en) * | 2013-03-28 | 2016-06-01 | 宝山钢铁股份有限公司 | A kind of low-alloy high hardness wear-resisting steel plate and manufacture method thereof |
| CN103911553B (en) * | 2014-03-19 | 2015-09-30 | 济钢集团有限公司 | A kind of high-strength antiknock steel plate of ATM in bank and manufacture method thereof |
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