CN104046890A - High-yield-ratio hot-galvanized micro-carbo/aluminum killed steel plate and production method thereof - Google Patents
High-yield-ratio hot-galvanized micro-carbo/aluminum killed steel plate and production method thereof Download PDFInfo
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- 229910000655 Killed steel Inorganic materials 0.000 title claims abstract description 35
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 28
- 229910052782 aluminium Inorganic materials 0.000 title abstract description 4
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 title abstract description 4
- 241000483280 Microcarbo Species 0.000 title abstract 3
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 96
- 239000010959 steel Substances 0.000 claims abstract description 96
- 238000000137 annealing Methods 0.000 claims abstract description 50
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims abstract description 44
- 238000009749 continuous casting Methods 0.000 claims abstract description 30
- 239000010960 cold rolled steel Substances 0.000 claims abstract description 26
- 238000005098 hot rolling Methods 0.000 claims abstract description 23
- 229910052742 iron Inorganic materials 0.000 claims abstract description 16
- 238000005097 cold rolling Methods 0.000 claims abstract description 15
- 238000005554 pickling Methods 0.000 claims abstract description 8
- 238000007670 refining Methods 0.000 claims abstract description 4
- 229910052799 carbon Inorganic materials 0.000 claims description 34
- 238000005498 polishing Methods 0.000 claims description 24
- 238000010438 heat treatment Methods 0.000 claims description 12
- 239000012535 impurity Substances 0.000 claims description 12
- 229910052757 nitrogen Inorganic materials 0.000 claims description 12
- 229910052698 phosphorus Inorganic materials 0.000 claims description 12
- 239000000203 mixture Substances 0.000 claims description 11
- 239000000126 substance Substances 0.000 claims description 11
- 238000005266 casting Methods 0.000 claims description 3
- 238000009826 distribution Methods 0.000 claims description 3
- 238000010583 slow cooling Methods 0.000 claims description 3
- 238000000034 method Methods 0.000 abstract description 29
- 238000005096 rolling process Methods 0.000 abstract description 19
- 238000012545 processing Methods 0.000 abstract description 15
- 239000002253 acid Substances 0.000 abstract 2
- 238000005246 galvanizing Methods 0.000 abstract 1
- 239000000463 material Substances 0.000 description 11
- 238000007730 finishing process Methods 0.000 description 9
- 239000013078 crystal Substances 0.000 description 8
- 230000003009 desulfurizing effect Effects 0.000 description 6
- 238000001953 recrystallisation Methods 0.000 description 6
- 238000013461 design Methods 0.000 description 5
- 230000035882 stress Effects 0.000 description 5
- 230000002929 anti-fatigue Effects 0.000 description 4
- 230000009286 beneficial effect Effects 0.000 description 4
- 230000032683 aging Effects 0.000 description 3
- 230000015572 biosynthetic process Effects 0.000 description 3
- 230000007547 defect Effects 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 238000002474 experimental method Methods 0.000 description 3
- 238000010899 nucleation Methods 0.000 description 3
- 230000006911 nucleation Effects 0.000 description 3
- 229910001562 pearlite Inorganic materials 0.000 description 3
- 238000002791 soaking Methods 0.000 description 3
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 2
- 229910001567 cementite Inorganic materials 0.000 description 2
- 238000004134 energy conservation Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 208000020442 loss of weight Diseases 0.000 description 2
- 201000009240 nasopharyngitis Diseases 0.000 description 2
- 101150073618 ST13 gene Proteins 0.000 description 1
- 239000004411 aluminium Substances 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000018109 developmental process Effects 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- KSOKAHYVTMZFBJ-UHFFFAOYSA-N iron;methane Chemical compound C.[Fe].[Fe].[Fe] KSOKAHYVTMZFBJ-UHFFFAOYSA-N 0.000 description 1
- 239000011159 matrix material Substances 0.000 description 1
- 239000007769 metal material Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 235000019362 perlite Nutrition 0.000 description 1
- 239000010451 perlite Substances 0.000 description 1
- 238000001556 precipitation Methods 0.000 description 1
- 230000002787 reinforcement Effects 0.000 description 1
- 229910000859 α-Fe Inorganic materials 0.000 description 1
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Abstract
The invention relates to a high-yield-ratio hot-galvanized micro-carbo/aluminum killed steel plate and a production method thereof. The method comprises the following steps: carrying out desulphurization, bessemerizing, RH vacuum refining and continuous casting on molten iron so as to obtain a continuous casting sheet billet; carrying out hot rolling on the continuous casting sheet billet so as to obtain a hot rolled sheet billet; rolling the hot rolled sheet billet so as to obtain hot-rolled steel coil; carrying out uncoiling and acid pickling on the hot-rolled steel coil; carrying out cold rolling on the hot-rolled steel coil subjected to acid pickling so as to obtain a cold-rolled steel plate; carrying out annealing and hot galvanizing on the cold-rolled steel plate in a continuous annealing furnace; and carrying out finishing processing on the annealed cold-rolled steel plate. The high-yield-ratio hot-galvanized micro-carbo/aluminum killed steel plate produced according to the method has good forming properties and mechanical properties, and can satisfy the requirements of cargo trucks on the stamping formability of steel plates.
Description
Technical field
The present invention relates to metal material processing technical field, particularly the micro-carbon aluminum-killed steel plate of a kind of high-yield strength pot galvanize and production method thereof.
Background technology
At present, many automobile factorys produce the back up pad of serial load-carrying vehicle and the sheet material of reinforcement plate parts employing is all common cold-reduced sheet St13, St14, conventionally rely on increase thickness of slab to improve intensity, this method has significant limitation, both increased great amount of cost, the cargo-carrying bus supporting capacity of producing is again limited, and anti-fatigue performance is poor in addition.
In recent years, society is along with the development of sheet forming technology, the emerging product of a class that the steel plate of high-yield-ratio is produced as the Strip that is applied to cargo-carrying bus, because of its distinctive excellent surface quality, suitable thickness deviation, good processing characteristics, gradually become the ideal chose of the common cold-reduced sheet of Substitute For Partial, but in prior art also not about being adapted to the document of production method of the micro-carbon aluminium killed steel of pot galvanize panel products of the high-yield strength of cargo-carrying bus.
Summary of the invention
For addressing the above problem, the invention provides the micro-carbon aluminum-killed steel plate of high-yield strength pot galvanize and production method thereof that a kind of stamping performance that can meet cargo-carrying bus steel plate required, had favorable forming property and mechanical property.
The production method of the micro-carbon aluminum-killed steel plate of a kind of high-yield strength pot galvanize provided by the invention comprises the following steps:
Step 1: molten iron refining obtains continuous casting steel billet; The chemical composition of described continuous casting steel billet is as follows: calculate by percentage to the quality, C:0.01～0.04%, Si≤0.03%, Mn:0.20～0.26%, P≤0.013%, S≤0.010%, Als:0.023～0.048%, N≤0.005%, B:0.001～0.008%, surplus is Fe and inevitable impurity;
Step 2: described continuous casting steel billet is carried out to hot rolling, obtain hot rolling slab; In described course of hot rolling, heating and temperature control is at 1260-1300 ℃; Finishing temperature is controlled at 900～940 ℃;
Step 3: described hot rolling slab is batched, obtain coils of hot-rolled steel; Described coiling temperature is controlled at 730 ± 20 ℃;
Step 4: described coils of hot-rolled steel is carried out to uncoiling pickling;
Step 5: the described coils of hot-rolled steel after pickling is carried out cold rolling, obtain cold-rolled steel sheet;
Step 6: in continuous annealing furnace, described cold-rolled steel sheet is annealed and pot galvanize; In described continuous annealing furnace, heating zone temperature is controlled at 750 ± 20 ℃, and annealing temperature is controlled at 750 ± 20 ℃, and slow cooling temperature out is 465 ± 5 ℃, and cold temperature out is 160 ℃ eventually;
Step 7: the described cold-rolled steel sheet after annealing is carried out to polishing, and polishing unit elongation is 1.1 ± 0.2%.
As preferably, described step 1 must strict quantity, type, form and the distribution situation thereof of controlling Inclusion During Slab Casting.
As preferably, in described step 5, cold rolling draft is controlled at 75～80%.
As preferably, in described step 7, polishing unit elongation is 1.0%.
The production method of the micro-carbon aluminum-killed steel plate of high-yield strength pot galvanize provided by the invention reasonably designs chemical composition can guarantee that the ratio of steel Medium pearlite and AlN are to the effective pinning effect of crystal boundary; By strict control steel inclusion, control separating out of AlN in steel, make hot-rolled sheet coil keep a certain proportion of 111} texture, thus effectively improve the yield strength of product.By controlling the processing parameter of course of hot rolling, can suppress separating out of AIN and grow up, in the recrystallize after cold roller and deformed and annealing process, be beneficial to { the formation of 111} texture.By controlling the processing parameter of cold-rolled process, make the cold-rolled steel sheet obtaining be conducive to control motivating force and the Recrystallization nucleation point of zinc-plated operation annealing recrystallization subsequently.By controlling the processing parameter of annealing process, make steel plate that abundant recrystallize occur, by controlling soaking time, better regulate the size of grain-size, thereby be conducive to reduce the yield strength with steel, improve the unit elongation with steel.The rear employing finishing process of having annealed, by polishing elongation control 1.1 ± 0.2%, when guaranteeing sheet material strip shape quality, eliminate better sheet material unrelieved stress and yield point elongation, obtain the crystal grain of comparatively refinement, yield point elongation in the time of can eliminating product stretching experiment, prevents that steel plate finished product from occurring Lüders bands defect and improving the ageing resistance performance of product in stamping process.
The micro-carbon aluminum-killed steel plate of a kind of high-yield strength pot galvanize provided by the invention is produced according to described production method.
The chemical composition of the micro-carbon aluminum-killed steel plate of described high-yield strength pot galvanize is as follows: calculate by percentage to the quality, C:0.01～0.04%, Si≤0.03%, Mn:0.20～0.26%, P≤0.013%, S≤0.010%, Als:0.023～0.048%, N≤0.005%, B:0.001～0.008%, surplus is Fe and inevitable impurity.
The micro-carbon aluminum-killed steel plate of high-yield strength pot galvanize provided by the invention is produced by the production method of the micro-carbon aluminum-killed steel plate of high-yield strength pot galvanize, this production method is by the chemical composition of appropriate design band steel, adjust carbon content, optimize hot rolling, cold rolling, annealing and flattening technological parameter, thereby produce, the yield strength of the micro-carbon aluminum-killed steel plate of this pot galvanize significantly improves, yield tensile ratio significantly improves, thereby the tough and double over-all properties of material is found full expression, increased the service stress of material, the forming property that it is good and mechanical property meet the performance requriements of Steel Sheet for cargo-carrying bus, because these steel have good anti-fatigue performance, the application of these steel can improve the safety performance of cargo-carrying bus to a great extent, realizes to a certain extent object energy-conservation, loss of weight when can improve body in white structural strength.
Accompanying drawing explanation
The process flow sheet of the production method of the micro-carbon aluminum-killed steel plate of high-yield strength pot galvanize that Fig. 1 provides for the embodiment of the present invention.
The metallographic microstructure photo of the micro-carbon aluminum-killed steel plate of high-yield strength pot galvanize that Fig. 2 provides for the embodiment of the present invention.
Embodiment
In order to understand the present invention in depth, below in conjunction with embodiment, the present invention is described in detail.
Referring to accompanying drawing 1, the production method of the micro-carbon aluminum-killed steel plate of a kind of high-yield strength pot galvanize provided by the invention comprises the following steps:
Step 1: molten iron refining obtains continuous casting steel billet; The chemical composition of continuous casting steel billet is as follows: calculate by percentage to the quality, C:0.01～0.04%, Si≤0.03%, Mn:0.20～0.26%, P≤0.013%, S≤0.010%, Als:0.023～0.048%, N≤0.005%, B:0.001～0.008%, surplus is Fe and inevitable impurity; B:0.001-0.008% in the chemical composition of this steel plate, Mn:0.20-0.26%, Als:0.023-0.048%, can reduce Fe3C and pearlitic content in matrix, thereby effectively improves the yield strength of product; By design Mn and Als content, can guarantee that the ratio of steel Medium pearlite and AlN are to the effective pinning effect of crystal boundary.By strict control steel inclusion, control separating out of AlN in steel, make hot-rolled sheet coil keep a certain proportion of 111} texture, thus effectively reduce the yield strength of product.
Step 2: continuous casting steel billet is carried out to hot rolling, obtain hot rolling slab; In course of hot rolling, heating and temperature control is at 1190-1280 ℃; Finishing temperature is controlled at 920 ± 20 ℃.
Step 3: hot rolling slab is batched, obtain coils of hot-rolled steel; Coiling temperature is controlled at 730 ± 20 ℃; Wherein 730 ± 20 ℃ of coiling temperatures are lower, can suppress separating out of AIN and grow up, and are beneficial to { the formation of 111} texture in the recrystallize after cold roller and deformed and annealing process.
Step 4: coils of hot-rolled steel is carried out to uncoiling pickling.
Step 5: the coils of hot-rolled steel after pickling is carried out cold rolling, obtain cold-rolled steel sheet.
Step 6: in continuous annealing furnace, cold-rolled steel sheet is annealed and pot galvanize; In continuous annealing furnace, heating zone temperature is controlled at 750 ± 20 ℃, annealing temperature is controlled at 750 ± 20 ℃, slow cooling temperature out is 465 ± 5 ℃, cold temperature out is 160 ℃ eventually, annealing process makes steel plate that abundant recrystallize occur, by controlling soaking time, better regulate the size of grain-size, thereby be conducive to improve the yield strength with steel, improve the unit elongation with steel.
Step 7: the cold-rolled steel sheet after annealing is carried out to polishing, and polishing unit elongation is 1.1 ± 0.2%.
Wherein, step 1 must strict quantity, type, form and the distribution situation thereof of controlling Inclusion During Slab Casting.
Wherein, in step 5, cold rolling draft is controlled at 75～80%, is conducive to control motivating force and the Recrystallization nucleation point of zinc-plated operation annealing recrystallization subsequently.
Wherein, in step 7, polishing unit elongation is 1.0%, after annealing, adopt finishing process, polishing unit elongation is 1.0%, when guaranteeing sheet material strip shape quality, eliminate better sheet material unrelieved stress and yield point elongation, obtain the crystal grain of comparatively refinement, yield point elongation in the time of can eliminating product stretching experiment, prevents that steel plate finished product from occurring Lüders bands defect and improving the ageing resistance performance of product in stamping process.
Whole technique does not adopt microalloying, has avoided increase process costs.
The production method of the micro-carbon aluminum-killed steel plate of high-yield strength pot galvanize provided by the invention reasonably designs chemical composition can guarantee that the ratio of steel Medium pearlite and AlN are to the effective pinning effect of crystal boundary; By strict control steel inclusion, control separating out of AlN in steel, make hot-rolled sheet coil keep a certain proportion of 111} texture, thus effectively improve the yield strength of product.By controlling the processing parameter of course of hot rolling, can suppress separating out of AIN and grow up, in the recrystallize after cold roller and deformed and annealing process, be beneficial to { the formation of 111} texture.By controlling the processing parameter of cold-rolled process, make the cold-rolled steel sheet obtaining be conducive to control motivating force and the Recrystallization nucleation point of zinc-plated operation annealing recrystallization subsequently.By controlling the processing parameter of annealing process, make steel plate that abundant recrystallize occur, by controlling soaking time, better regulate the size of grain-size, thereby be conducive to reduce the yield strength with steel, improve the unit elongation with steel.The rear employing finishing process of having annealed, by polishing elongation control 1.1 ± 0.2%, when guaranteeing sheet material strip shape quality, eliminate better sheet material unrelieved stress and yield point elongation, obtain the crystal grain of comparatively refinement, yield point elongation in the time of can eliminating product stretching experiment, prevents that steel plate finished product from occurring Lüders bands defect and improving the ageing resistance performance of product in stamping process.
The micro-carbon aluminum-killed steel plate of a kind of high-yield strength pot galvanize provided by the invention is produced according to production method.
The chemical composition of the micro-carbon aluminum-killed steel plate of high-yield strength pot galvanize is as follows: calculate by percentage to the quality, C:0.01～0.04%, Si≤0.03%, Mn:0.20～0.26%, P≤0.013%, S≤0.010%, Als:0.023～0.048%, N≤0.005%, B:0.001～0.008%, surplus is Fe and inevitable impurity.
Below in conjunction with specific embodiment, the present invention will be further described:
Embodiment 1
The flow process of the production method of the micro-carbon aluminum-killed steel plate of high-yield strength pot galvanize provided by the invention is:
According to steel grades, be designed to C:0.01～0.04%, Si≤0.03%, Mn:0.23%, P≤0.013%, S≤0.010%, Als:0.023%, N≤0.005%, B:0.001～0.008%, surplus is Fe and inevitable impurity, adopt desulfurizing iron, bessemerize, RH vacuum refinement, continuous casting obtains continuous casting steel billet.
Continuous casting steel billet is through process furnace heating, rolling on Continuous Heat tandem rolling mill, and control coolingly, and then batching, the coiling temperature after hot rolling is controlled and is: 716 ℃, the coils of hot-rolled steel that output is qualified.
Coils of hot-rolled steel again uncoiling, after overpickling is washed surperficial iron scale off, is carried out cold rollingly on cold continuous rolling, and controlling cold rolling draft is 75.4%, obtains cold-rolled steel sheet.
By cold-rolled steel sheet continuous annealing and pot galvanize processing in continuous annealing furnace, annealing temperature is 750 ℃, adopts finishing process after annealing, and polishing elongation control is 1.0, obtains required steel plate after polishing.
The yield strength ReL of the steel plate making is that 183MPa, unit elongation A80% are 38.2.
Embodiment 2
The flow process of the production method of the micro-carbon aluminum-killed steel plate of high-yield strength pot galvanize provided by the invention is:
According to steel grades, be designed to C:0.01～0.04%, Si≤0.03%, Mn:0.25%, P≤0.013%, S≤0.010%, Als:0.028%, N≤0.005%, B:0.001～0.008%, surplus is Fe and inevitable impurity, adopt desulfurizing iron, bessemerize, RH vacuum refinement, continuous casting obtains continuous casting steel billet.
Continuous casting steel billet is through process furnace heating, rolling on Continuous Heat tandem rolling mill, and control coolingly, and then batching, the coiling temperature after hot rolling is controlled and is: 732 ℃, the coils of hot-rolled steel that output is qualified.
Coils of hot-rolled steel again uncoiling, after overpickling is washed surperficial iron scale off, is carried out cold rollingly on cold continuous rolling, and controlling cold rolling draft is 76.2%, obtains cold-rolled steel sheet.
By cold-rolled steel sheet continuous annealing and pot galvanize processing in continuous annealing furnace, annealing temperature is 750 ℃, adopts finishing process after annealing, and polishing elongation control is 1.1, obtains required steel plate after polishing.
The yield strength ReL of the steel plate making is that 181MPa, unit elongation A80% are 38.9.
Embodiment 3
The flow process of the production method of the micro-carbon aluminum-killed steel plate of high-yield strength pot galvanize provided by the invention is:
According to steel grades, be designed to C:0.01～0.04%, Si≤0.03%, Mn:0.24%, P≤0.013%, S≤0.010%, Als:0.031%, N≤0.005%, B:0.001～0.008%, surplus is Fe and inevitable impurity, adopt desulfurizing iron, bessemerize, RH vacuum refinement, continuous casting obtains continuous casting steel billet.
Continuous casting steel billet is through process furnace heating, rolling on Continuous Heat tandem rolling mill, and control coolingly, and then batching, the coiling temperature after hot rolling is controlled and is: 722 ℃, the coils of hot-rolled steel that output is qualified.
Coils of hot-rolled steel again uncoiling, after overpickling is washed surperficial iron scale off, is carried out cold rollingly on cold continuous rolling, and controlling cold rolling draft is 78.3%, obtains cold-rolled steel sheet.
By cold-rolled steel sheet continuous annealing and pot galvanize processing in continuous annealing furnace, annealing temperature is 750 ℃, adopts finishing process after annealing, and polishing elongation control is 1.2, obtains required steel plate after polishing.
The yield strength ReL of the steel plate making is that 182MPa, unit elongation A80% are 38.8.
Embodiment 4
The flow process of the production method of the micro-carbon aluminum-killed steel plate of high-yield strength pot galvanize provided by the invention is:
According to steel grades, be designed to C:0.01～0.04%, Si≤0.03%, Mn:0.26%, P≤0.013%, S≤0.010%, Als:0.032%, N≤0.005%, B:0.001～0.008%, surplus is Fe and inevitable impurity, adopt desulfurizing iron, bessemerize, RH vacuum refinement, continuous casting obtains continuous casting steel billet.
Continuous casting steel billet is through process furnace heating, rolling on Continuous Heat tandem rolling mill, and control coolingly, and then batching, the coiling temperature after hot rolling is controlled and is: 723 ℃, the coils of hot-rolled steel that output is qualified.
Coils of hot-rolled steel again uncoiling, after overpickling is washed surperficial iron scale off, is carried out cold rollingly on cold continuous rolling, and controlling cold rolling draft is 77.8%, obtains cold-rolled steel sheet.
By cold-rolled steel sheet continuous annealing and pot galvanize processing in continuous annealing furnace, annealing temperature is 750 ℃, adopts finishing process after annealing, and polishing elongation control is 1.1, obtains required steel plate after polishing.
The yield strength ReL of the steel plate making is that 180MPa, unit elongation A80% are 38.2.
Embodiment 5
The flow process of the production method of the micro-carbon aluminum-killed steel plate of high-yield strength pot galvanize provided by the invention is:
According to steel grades, be designed to C:0.01～0.04%, Si≤0.03%, Mn:0.22%, P≤0.013%, S≤0.010%, Als:0.029%, N≤0.005%, B:0.001～0.008%, surplus is Fe and inevitable impurity, adopt desulfurizing iron, bessemerize, RH vacuum refinement, continuous casting obtains continuous casting steel billet.
Continuous casting steel billet is through process furnace heating, rolling on Continuous Heat tandem rolling mill, and control coolingly, and then batching, the coiling temperature after hot rolling is controlled and is: 727 ℃, the coils of hot-rolled steel that output is qualified.
Coils of hot-rolled steel again uncoiling, after overpickling is washed surperficial iron scale off, is carried out cold rollingly on cold continuous rolling, and controlling cold rolling draft is 77.2%, obtains cold-rolled steel sheet.
By cold-rolled steel sheet continuous annealing and pot galvanize processing in continuous annealing furnace, annealing temperature is 750 ℃, adopts finishing process after annealing, and polishing elongation control is 1.2, obtains required steel plate after polishing.
The yield strength ReL of the steel plate making is that 184MPa, unit elongation A80% are 38.7.
Embodiment 6
The flow process of the production method of the micro-carbon aluminum-killed steel plate of high-yield strength pot galvanize provided by the invention is:
According to steel grades, be designed to C:0.01～0.04%, Si≤0.03%, Mn:0.25%, P≤0.013%, S≤0.010%, Als:0.035%, N≤0.005%, B:0.001～0.008%, surplus is Fe and inevitable impurity, adopt desulfurizing iron, bessemerize, RH vacuum refinement, continuous casting obtains continuous casting steel billet.
Continuous casting steel billet is through process furnace heating, rolling on Continuous Heat tandem rolling mill, and control coolingly, and then batching, the coiling temperature after hot rolling is controlled and is: 717 ℃, the coils of hot-rolled steel that output is qualified.
Coils of hot-rolled steel again uncoiling, after overpickling is washed surperficial iron scale off, is carried out cold rollingly on cold continuous rolling, and controlling cold rolling draft is 79.2%, obtains cold-rolled steel sheet.
By cold-rolled steel sheet continuous annealing and pot galvanize processing in continuous annealing furnace, annealing temperature is 750 ℃, adopts finishing process after annealing, and polishing elongation control is 1.1, obtains required steel plate after polishing.
The yield strength ReL of the steel plate making is that 181MPa, unit elongation A80% are 39.8.
The mechanical property of the micro-carbon aluminum-killed steel plate of high-yield strength pot galvanize obtaining from embodiment 1-6, can find out, the yield strength of steel plate significantly improves, and yield tensile ratio significantly improves, and has good anti-fatigue performance.Referring to Fig. 2, the metallographic microstructure photo of the micro-carbon aluminum-killed steel plate of high-yield strength pot galvanize providing from the embodiment of the present invention, the metallographic structure of band steel is typical ferrite equi-axed crystal, grain fineness number is 10 grades, the cementite particle of disperse and the block perlite of a small amount of intercrystalline precipitation are distributing on crystal grain.
The micro-carbon aluminum-killed steel plate of high-yield strength pot galvanize provided by the invention is produced by the production method of the micro-carbon aluminum-killed steel plate of high-yield strength pot galvanize, this production method is by the chemical composition of appropriate design band steel, adjust carbon content, optimize hot rolling, cold rolling, annealing and flattening technological parameter, thereby produce, the yield strength of the micro-carbon aluminum-killed steel plate of this pot galvanize significantly improves, yield tensile ratio significantly improves, thereby the tough and double over-all properties of material is found full expression, increased the service stress of material, the forming property that it is good and mechanical property meet the performance requriements of Steel Sheet for cargo-carrying bus, because these steel have good anti-fatigue performance, the application of these steel can improve the safety performance of cargo-carrying bus to a great extent, realizes to a certain extent object energy-conservation, loss of weight when can improve body in white structural strength.
Above-described embodiment; object of the present invention, technical scheme and beneficial effect are further described; institute is understood that; the foregoing is only the specific embodiment of the present invention; be not limited to the present invention; within the spirit and principles in the present invention all, any modification of making, be equal to replacement, improvement etc., within all should being included in protection scope of the present invention.
Claims (5)
1. a production method for the micro-carbon aluminum-killed steel plate of high-yield-ratio pot galvanize, is characterized in that, comprises the following steps:
Step 1: molten iron refining obtains continuous casting steel billet; The chemical composition of described continuous casting steel billet is as follows: calculate by percentage to the quality, C:0.01～0.04%, Si≤0.03%, Mn:0.20～0.26%, P≤0.013%, S≤0.010%, Als:0.023～0.048%, N≤0.005%, B:0.001～0.008%, surplus is Fe and inevitable impurity;
Step 2: described continuous casting steel billet is carried out to hot rolling, obtain hot rolling slab; In described course of hot rolling, heating and temperature control is at 1260-1300 ℃; Finishing temperature is controlled at 900～940 ℃;
Step 3: described hot rolling slab is batched, obtain coils of hot-rolled steel; Described coiling temperature is controlled at 730 ± 20 ℃;
Step 4: described coils of hot-rolled steel is carried out to uncoiling pickling;
Step 5: the described coils of hot-rolled steel after pickling is carried out cold rolling, obtain cold-rolled steel sheet;
Step 6: in continuous annealing furnace, described cold-rolled steel sheet is annealed and pot galvanize; In described continuous annealing furnace, heating zone temperature is controlled at 750 ± 20 ℃, and annealing temperature is controlled at 750 ± 20 ℃, and slow cooling temperature out is 465 ± 5 ℃, and cold temperature out is 160 ℃ eventually;
Step 7: the described cold-rolled steel sheet after annealing is carried out to polishing, and polishing unit elongation is 1.1 ± 0.2%.
2. production method according to claim 1, is characterized in that:
Described step 1 must strict quantity, type, form and the distribution situation thereof of controlling Inclusion During Slab Casting.
3. production method according to claim 1, is characterized in that:
In described step 5, cold rolling draft is controlled at 75～80%.
4. production method according to claim 1, is characterized in that:
In described step 7, polishing unit elongation is 1.0%.
5. the micro-carbon aluminum-killed steel plate of high-yield-ratio pot galvanize, is characterized in that:
The micro-carbon aluminum-killed steel plate of described high-yield-ratio pot galvanize is to produce according to the production method described in claim 1～4 any one;
The chemical composition of the micro-carbon aluminum-killed steel plate of described high-yield-ratio pot galvanize is as follows: calculate by percentage to the quality, C:0.01～0.04%, Si≤0.03%, Mn:0.20～0.26%, P≤0.013%, S≤0.010%, Als:0.023～0.048%, N≤0.005%, B:0.001～0.008%, surplus is Fe and inevitable impurity.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410252070.6A CN104046890A (en) | 2014-06-09 | 2014-06-09 | High-yield-ratio hot-galvanized micro-carbo/aluminum killed steel plate and production method thereof |
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|---|---|---|---|
| CN201410252070.6A CN104046890A (en) | 2014-06-09 | 2014-06-09 | High-yield-ratio hot-galvanized micro-carbo/aluminum killed steel plate and production method thereof |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN106319354A (en) * | 2015-06-17 | 2017-01-11 | 上海梅山钢铁股份有限公司 | Medium-size back plate punching distortion resisting galvanized steel and manufacturing method thereof |
| CN106676392A (en) * | 2016-12-27 | 2017-05-17 | 首钢总公司 | Hot-dip galvanized plate and production method thereof |
| CN111519016A (en) * | 2020-04-30 | 2020-08-11 | 江苏省沙钢钢铁研究院有限公司 | Preparation method of hot-dip galvanized sheet, and hot-dip galvanized sheet |
| WO2021136336A1 (en) * | 2019-12-30 | 2021-07-08 | Jiangsu Shagang Group Co., Ltd. | Method for producing boron-added steel based on twin-roll strip casting |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN106319354A (en) * | 2015-06-17 | 2017-01-11 | 上海梅山钢铁股份有限公司 | Medium-size back plate punching distortion resisting galvanized steel and manufacturing method thereof |
| CN106319354B (en) * | 2015-06-17 | 2018-04-24 | 上海梅山钢铁股份有限公司 | Medium size backboard anti-impact pressure distortion galvanized steel and its manufacture method |
| CN106676392A (en) * | 2016-12-27 | 2017-05-17 | 首钢总公司 | Hot-dip galvanized plate and production method thereof |
| WO2021136336A1 (en) * | 2019-12-30 | 2021-07-08 | Jiangsu Shagang Group Co., Ltd. | Method for producing boron-added steel based on twin-roll strip casting |
| CN111519016A (en) * | 2020-04-30 | 2020-08-11 | 江苏省沙钢钢铁研究院有限公司 | Preparation method of hot-dip galvanized sheet, and hot-dip galvanized sheet |
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