CN106319354B - Medium size backboard anti-impact pressure distortion galvanized steel and its manufacture method - Google Patents
Medium size backboard anti-impact pressure distortion galvanized steel and its manufacture method Download PDFInfo
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- CN106319354B CN106319354B CN201510334712.1A CN201510334712A CN106319354B CN 106319354 B CN106319354 B CN 106319354B CN 201510334712 A CN201510334712 A CN 201510334712A CN 106319354 B CN106319354 B CN 106319354B
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Abstract
The present invention relates to liquid crystal backboard anti-impact to press distortion galvanized steel and its manufacture method, the technical problem that 22 29 cun of liquid crystal backboard module punching courses are distorted mainly is solved, to reach above-mentioned purpose, the chemical analysis of substrate of the present invention（Percentage by weight）For：C：0.010~0.019%, Si：0.01 0.03%, Mn：0.05 0.09%, Al:0.01 0.06%, P≤0.015%, S≤0.010%, B:0.0010 0.0020%, surplus is Fe and inevitable tramp element.Slab is rolled after heating, finishing temperature is 850 900 DEG C, coiling temperature is 730 750 DEG C, rolling hot rolled steel plate, after overpickling, cold rolling is carried out on reversible rolling or 5 Stands Cold Tandem Mills to hot rolled plate for uncoiling again, last annealed stove is annealed, 800 850 DEG C of soaking temperature, soaking time 30 40 seconds, obtains final products.Suitable for liquid crystal backboard module punch process with 0.5 0.6mm galvanized steel plain sheets.
Description
Technical field
The present invention relates to the method that a kind of solution 22-29 cuns of liquid crystal backboard module punching courses are distorted, pass through analysis
The material property that is distorted of punching course is influenced, a kind of steel plate punched process that improves is have found and is distorted method, be suitable for
Liquid crystal backboard module punch process 0.5-0.6mm galvanized steel plain sheets.
Background technology
As the improvement of people's living standards, more and more electronic displays are shown using crystal liquid mode, while liquid crystal
The size that display uses is increasing, can be divided into three classes according to the size of liquid crystal display, one kind is with small less than 21 inches
Sized liquid crystal screen, two classes are with 22-29 inches of medium-size liquid crystal screen, and three classes are with 32-49 inches of Large-size LCD Screen.Liquid
The component that crystal display is used to support liquid crystal display is liquid crystal module, it is divided into module frame and module backboard, and module frame can lead to
Welding processing shaping is crossed, module backboard process is more complicated, and steel plate is realized by slitting, cutting plate and punch forming, punching press
Liquid crystal backboard product afterwards has unevenness after punching press higher requirement, usually requires that less than or equal to below 1.5mm, if unevenness
Requirement is not reached, module backboard in assembling can be contacted with liquid crystal light source fluorescent tube, damage fluorescent tube, while subsequent product is processed
Journey unevenness can not meet requirement processing can then occur and can not be automatically performed, and therefore, backboard product is to the steel plate after steel plate forming
It is required that there is higher stiffness requirement, the stiffness for being molded backboard is molded back board structure, original steel plate unevenness and steel plate materials with it
Characteristic is related, and existing product steel plate yield strength is actual in 250-400MPa scopes, while becoming larger with liquid crystal screen dimensions, existing
Have that the material phenomenon that is distorted is increasingly severe, it is especially real in the medium-size liquid crystal screen backboard product applied to 22-29 inches
Steel plate is distorted problem after generally existing punching press during the use of border, i.e., steel plain part unevenness exceedes after punching press
1.5mm, problem that people also try every possible means to improve always and control is distorted.
Therefore, 22-29 inch liquid crystal backboard products are suitable for according to the processing characteristic needs of industry product, research one kind
It is not distorted after punching press method with steel plate, to improve distortion resistance after punching press.
Chinese Patent Application No. 201010263178.7 discloses hot-dip galvanizing sheet steel and its manufacture method and application, LED
LCD TV rear shell, its main application are approached with patent of the present invention, are mainly solved for product pole complicated, that stretching is larger
Easily there is the problems such as drawing crack.The distortion that the problem of contrast patent document, its cracking solved solves with patent of the present invention is asked
Topic differs, not strong with comparativity of the present invention, but its corresponding technique can make certain comparison.
The content of the invention
Meet steel the purpose of the present invention is research one kind is suitable for the zinc-plated liquid crystal backboard product of 22-29 inches of medium sizes
The method that plate is not distorted after punching press, mainly solves suitable for galvanized steel plain sheet product medium size backboard punching course
The technical problem being distorted.In order to solve the problems, such as that medium size distortion does not reach, it is necessary to solve applicable material yield strength
Improve punching press distortion to require and material lateral performance homogeneity question.
The technical thought that the present invention takes is that research one kind utilizes carbon aluminium-killed steel, by adding trace element, is passed through
Unconventional annealing process technology, the low surrender of material and performance uniformity requirement reached, so as to improve and eliminate the medium size back of the body
The generation of plate distortion problem.
To reach above-mentioned purpose, the chemical analysis of substrate of the present invention（Percentage by weight）For：C：0.010~0.019%, Si：
0.01-0.03%, Mn：0.05-0.09%, Al:0.01-0.06%, P≤0.015%, S≤0.010%, B:0.0010-0.0020%,
Surplus is Fe and inevitable tramp element.
In a kind of method for improving steel plate punched process and being distorted of the present invention, material chemical composition is limited to
The reasons why in the range of stating, is as follows：
[carbon]：Solution strengthening element in steel, controls material yield strength, while material phase transformation point Ar3 when addition is very few
Improving, technique realizes that difficulty is big, and material structure performance uniformity cannot be guaranteed, therefore, setting carbon content 0.010~
0.019%。
[manganese]：Solution strengthening element in steel, controls material yield strength, the steel of suitable performance in order to obtain in the present invention
Plate, adding a small amount of manganese reduces material phase transformation point Ar3, ensures the properties of product of material structure uniformity, in order to obtain low surrender, if
It is 0.05-0.09% to determine manganese content.
[boron]：Boron is among the austenite stabilizing elements, can effectively reduce material phase transformation point Ar3, it is easy that process window is realized, material
Expect that structural homogenity is more preferable, while during hot rolling, the precipitation of thick BN, is conducive to the length of original ferrite crystal grain
Greatly, to realize that final products create conditions, the present invention sets content as 0.0010-0.0020%.
[silicon]：Higher content intensified element, for cold-rolled products, steel hot rolling surface hour hands occur red when Si contents are high
Become rusty iron scale, influences finished appearance, and the Si contents in the present invention are set as 0.01-0.03%.
[sulphur]：S in the present invention is impurity element, and according to actual steel capacity, application claims S control ranges are
S≤0.010%。
[phosphorus]：P in the present invention is impurity element, and according to actual steel capacity, the control of application claims P content is
P≤0.015%
In the present invention in manufacture method：
Slab heating temperature：Ensure complete austenitizing and hot-working requirement, heating-up temperature is at 1100-1200 DEG C.
Finishing temperature：Since carbon designs for low-carbon in steel, material phase transformation point A3 is caused to improve, micronutrient boron adds
Enter to reduce transformation temperature A3, through the testing of materials and calculating, its transformation temperature A3 scopes are 850-860 DEG C, according to analysis of experiments, in order to up to
To the uniform purpose of material, therefore the present invention sets finish rolling finishing temperature as 850 DEG C~900 DEG C.
Coiling temperature：Coiling temperature, which separates out ferrite grain size and pearlite, to be had an impact, in order to obtain thick iron
Ferritic tissue, creates conditions, the coiling temperature set is 730 DEG C~750 DEG C for final products performance.
Annealing temperature：Realize that material grains are grown up by annealing, improve material plasticity, be found by experiment that, with annealing
The material yield strength of temperature declines, but after material enters two-phase section, material yield strength starts to raise, and then declines, because
This, steel band is 800~850 DEG C in the annealing region of the soaking zone of continuous annealing furnace, and the annealing soak time is 30-40 seconds.
The yield strength R of substrate of the present inventionP0.2For 190-230Mpa, tensile strength Rm 290-350Mpa, elongation（A80）
35-45%, longitudinal very poor 0-10MPa of yield strength, preferably control the very poor 5-10MPa of longitudinal yield strength.Microscopic structure is again
Ferritic structure+pearlite is crystallized, crystallite dimension is 15-25 μm, is used suitable for 22-29 cuns of liquid crystal backboard module punch process
0.5-0.6mm galvanized steel plain sheets.
Beneficial effect of the present invention：The present invention and number of patent application 201010263178.7《Hot-dip galvanizing sheet steel and its manufacturer
Method and application, LED LCD TV rear shells》Compare, 1, publication in chemical composition, since its scope is too wide in range, its
The carbon content of 2 embodiments is not inconsistent with technical solution, and exploitativeness is not strong；2nd, it fails to carry on publication steel sheet manufacturing method
For hot-rolled process parameter, and its annealing process is 650 × 2h, of the present invention annealing time significantly different with the continuous annealing time of the present invention
Only 30-40 seconds, production efficiency higher of the present invention；3rd, publication performance is also excessively wide in range, can not determine its specific value；4th, produce
In terms of product function, publication solves problem of Cracking, though material property covers this patent scope, material structure of the present invention is uniform
Property is more preferable, preferably solves the problems, such as twisting technique.By carbon aluminium-killed steel composition design, ultra-low-carbon steel composition design is avoided,
So as to need not move through the product technology ability that ultralow surrender can be achieved in the decarburization of RH processes in technique realization；5th, addition is passed through
Micro- method, can significantly improve homogenous material properties, realize that product manufacturing stability is improved in amplitude, pass through one
The technology of kind two-phase section annealing, it is easy to realize the low yield behavior requirement of material.The method of the present invention is a kind of grinding for galvanized steel plain sheet
System, can solve a kind of method that medium size backboard product is distorted, while the material technology window is larger, industrial realization
Easily.
Brief description of the drawings
Fig. 1 is the metallographic structure photo of the embodiment of the present invention 2.
Fig. 2 is the metallographic structure photo of comparative example 2 of the present invention.
Fig. 3 is indulged to yield strength uniform distribution figure for 1 plate of the embodiment of the present invention.
Fig. 4 is indulged to yield strength uniform distribution figure for 1 plate of comparative example of the present invention.
Embodiment
With reference to embodiment 1-8 and comparative example 1-6, the invention will be further described, as shown in table 1, table 2：
Strip shown in table 1, table 2 its by conventional steelmaking converter melting, obtained by adding alloying element carbon, manganese, boron
The continuous casting billet for the chemical composition that meets the requirements, slab are rolled after heating, and finishing temperature is 850-900 DEG C, coiling temperature
For 730-750 DEG C, rolling hot rolled steel plate, uncoiling is after overpickling again for hot rolled plate, in reversible rolling or 5 rack cold continuous rollings
Cold rolling is carried out on machine, last annealed stove is annealed, 800-850 DEG C of soaking temperature, soaking time 30-40 seconds.Table 3 is implementation
Example 1-8 and comparative example 1-6 is that different steel plates carry out the unevenness contrast after punch test, is confirmed whether the experiment knot being distorted
Fruit.
It is distorted and is judged according to following standard, zero is represented non-warping, × representative distortion；
○：Unevenness is less than or equal to 1.5mm
×：Unevenness is more than 1.5mm.
In order to not be distorted after achieving the purpose that punching press, emphasis of the present invention solves yield strength requirement and the plate of production board
The homogeneity question of cross direction yield strength.From the scope of Tables 1 and 2, in order to control material property, by taking addition
Carbon, manganese, boron element carry out ferrite matrix reinforcing and corresponding hot rolling, 1-6 pairs of cold-rolling process matching, embodiment 1-8 and comparative example
Than adding the influence of different carbon content, manganese content, Boron contents to material property, experiment shows that material carbon content control exists
0.01-0.019%, manganese content are controlled in the range of 0.05-0.09%, and yield strength range-controllable system is in 190-230MPa, tension
Strength range is 292-349MPa, and material percentage elongation scope is 36-45%, longitudinal very poor 5-10MPa of yield strength.Fig. 1 is real
The metallographic structure photo of example 2 is applied, obtains recrystallization ferrite+pearlitic structrure, crystallite dimension is 15-25 μm.Fig. 2 comparative examples 2
Metallographic structure photo, relative to Fig. 1, its recrystal grain is tiny, 10-14 μm of crystallite dimension, and content of pearlite in alloy is high.
Embodiment 1 and comparative example 3 contrast respectively influences finished product yield strength by adding boron element and low manganese content, leads to
Cross contrast to find, 0.0020% boron element yield strength of addition is 216MPa, is not distorted after punching press, and is not added with element boron
Yield strength is 260MPa, is distorted after punching press, and boron element is added in element and advantageously reduces steel plate yield strength.Fig. 3 is shown
Show that 1 plate of embodiment is indulged to yield strength uniform distribution figure.
Embodiment 2 and comparative example 1, which are contrasted, influences homogenous material properties by adding boron element, is found by contrasting,
Add 0.0015% boron element embodiment 1 and surrender very poor 5MPa, be not distorted phenomenon after punching press, and is not added with boron element and compares
Example 1 surrenders very poor 15MPa, is distorted after its result punching press.Fig. 4 shows that 1 plate of comparative example is indulged to yield strength uniformity
Distribution map.
Embodiment 4 and comparative example 2 contrast respectively influences finished product yield strength by different carbon contents, is sent out by contrasting
Existing, 0.014% carbon yield strength of addition is 200MPa, is not distorted after punching press, and it is strong to add the surrender of 0.04% carbon
Spend for 265MPa, be distorted after punching press, in element the control of carbon element content advantageously reduce steel plate yield strength.
Embodiment 6 and comparative example 4, which contrast finishing temperature change, influences homogenous material properties, is found by contrasting, eventually
Embodiment 6 surrenders very poor 7MPa when rolling 900 degree of temperature, and be not distorted phenomenon after punching press, and 840 degree of comparative examples 4 of finishing temperature
Very poor 18MPa is surrendered, is distorted after its result punching press.
Embodiment 7 and comparative example 5, which contrast coiling temperature change, influences homogenous material properties, is found by contrasting, volume
7 yield strength 205MPa of embodiment when taking 746 DEG C of temperature, be not distorted phenomenon after punching press, and 600 degree of comparative examples of coiling temperature
5 yield strength 245MPa, are distorted after its result punching press.
Embodiment 8 and comparative example 6, comparative example 7 contrast influence of the annealing temperature change to material property, pass through to contrast and send out
It is existing, anneal 850 DEG C, 32 seconds time, obtain yield strength 208MPa, be not distorted phenomenon after punching press, and comparative example 6 is annealed temperature
780 DEG C of yield strength 280MPa, comparative example 7 annealing temperature, 760 DEG C of yield strength 260MPa are spent, illustrate that material is annealed in two-phase section
When yield strength first rise and decline afterwards with temperature rise, its result is distorted after causing punching press,.
In addition to the implementation, the present invention can also have other embodiment.It is all to use equivalent substitution or equivalent transformation shape
Into technical solution, all fall within the protection domains of application claims.
Table 1：Different chemical composition result of the test
。
Table 2：Different technical parameters result of the test
。
Table 3：Different performance material punch test result
Claims (2)
- A kind of 1. medium size backboard anti-impact pressure distortion galvanized steel, it is characterized in that the chemical ingredients by weight percent of the substrate of steel For：C：0.010~0.019%, Si：0.01-0.03%, Mn：0.05-0.09%, Al:0.01-0.06%, P≤0.015%, S≤ 0.010%, B:0.0010-0.0020%, surplus are Fe and inevitable tramp element；By conventional steelmaking converter melting, lead to Cross addition alloying element and obtain the continuous casting billet for meeting above-mentioned chemical composition requirement, slab is rolled after heating, finish to gauge temperature Spend for 850-900 DEG C, coiling temperature is 730-750 DEG C, rolling hot rolled steel plate, hot rolled plate again uncoiling after overpickling, Cold rolling is carried out on reversible rolling or 5 Stands Cold Tandem Mills, last annealed stove is annealed, 800-850 DEG C of soaking temperature, Hot time 30-40 seconds, obtain final products.
- 2. medium size backboard anti-impact pressure distortion galvanized steel according to claim 1, it is characterized in that the substrate of the steel Yield strength RP0.2It is very poor for 190-230MPa, tensile strength Rm 290-350MPa, elongation 35-45%, longitudinal yield strength 0-10MPa, is organized as ferrite+pearlite, and crystallite dimension is 15-25 μm.
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| CN110541107B (en) * | 2018-05-28 | 2021-04-06 | 上海梅山钢铁股份有限公司 | Hot-dip aluminum-zinc steel plate with tensile strength of 600MPa and manufacturing method thereof |
| CN112553537A (en) * | 2019-09-25 | 2021-03-26 | 上海梅山钢铁股份有限公司 | Cold-rolled hot-dip galvanized steel sheet with yield strength of 240MPa and manufacturing method thereof |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102378824A (en) * | 2009-03-31 | 2012-03-14 | 杰富意钢铁株式会社 | High-strength hot-dip galvanized steel plate and method for producing same |
| CN102758129A (en) * | 2012-06-19 | 2012-10-31 | 河北钢铁股份有限公司邯郸分公司 | Method for manufacturing non-spangle galvanized sheet DX54D+Z from aluminum killed steel |
| CN104046890A (en) * | 2014-06-09 | 2014-09-17 | 首钢总公司 | High-yield-ratio hot-galvanized micro-carbo/aluminum killed steel plate and production method thereof |
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102378824A (en) * | 2009-03-31 | 2012-03-14 | 杰富意钢铁株式会社 | High-strength hot-dip galvanized steel plate and method for producing same |
| CN102758129A (en) * | 2012-06-19 | 2012-10-31 | 河北钢铁股份有限公司邯郸分公司 | Method for manufacturing non-spangle galvanized sheet DX54D+Z from aluminum killed steel |
| CN104046890A (en) * | 2014-06-09 | 2014-09-17 | 首钢总公司 | High-yield-ratio hot-galvanized micro-carbo/aluminum killed steel plate and production method thereof |
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