CN104018088B - A kind of high-strength hot-dip galvanizing sheet steel and preparation method thereof - Google Patents
A kind of high-strength hot-dip galvanizing sheet steel and preparation method thereof Download PDFInfo
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- CN104018088B CN104018088B CN201410197774.8A CN201410197774A CN104018088B CN 104018088 B CN104018088 B CN 104018088B CN 201410197774 A CN201410197774 A CN 201410197774A CN 104018088 B CN104018088 B CN 104018088B
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Abstract
The invention provides a kind of high-strength hot-dip zinc-coated steel sheet and preparation method thereof, by choosing the proportioning of the each alloying element of hot-dip galvanizing sheet steel, can greatly improve armor plate strength, effectively control intensity by each processing step simultaneously and improved the adverse effect of bringing, prepared a kind of hot-dip galvanizing sheet steel that has high strength, excellent corrosion resistance and processing characteristics concurrently.
Description
Technical field
The present invention relates to the technical field of hot-dip galvanizing sheet steel, particularly the heat of high, the extension processing characteristics excellence of a kind of intensityGalvanized steel plain sheet and preparation method thereof.
Background technology
Hot-dip galvanizing sheet steel is because its good corrosion resistant performance, good paintability and clean outward appearance of beautifying are at household electricIn the industrial circles such as device, building materials, automobile, obtain using widely, particularly as body of a motor car sheet material. In recent years, along withEmphasis environmental protection, energy-saving and emission-reduction cry grow to even greater heights, and are to meet needs such as reducing vehicle fuel consume, require as vehicle body plateThe hot-dip galvanizing sheet steel of material is tending towards lightweight, and in light weight thin-walled property, also will ensure the security of automobile, inevitable requirementHot-dip galvanizing sheet steel has higher intensity.
In order to address the above problem, people adopt and in the alloying component of hot-dip galvanizing sheet steel, add more Si, Mn etc. by forceThe method of changing element improves the intensity of steel plate, although played like this effect that significantly improves intensity, has also brought veryMany negative impacts. First, having added the intensified element such as Si, Mn can be owing to forming a large amount of mixing metallographic groups that contains hardening constituentKnit, and larger performance difference between tissue, both easily caused intercrystalline corrosion and affect the decay resistance of steel plate, easily adding againIn work process, worsen the processing characteristics such as hole expandability and ductility at grain boundaries germinating crackle. Secondly, the strengthening such as Si, Mn of interpolationElement be all oxidizable element and easily cause the selective oxidation of surface of steel plate, form oxide at surface of steel plate, therebyAffect the binding ability of coating, and become the source of plating defect. In addition also there is certain processing in thin-wall high-strength steel plate self,Performance issue.
How can obtain the high-intensity while, to ensure decay resistance and the processing characteristics of steel plate, be galvanizingThe technical problem that steel plate field is urgently to be resolved hurrily.
Summary of the invention
Object of the present invention is to provide a kind of high-strength hot-dip galvanizing sheet steel and preparation method thereof, and it mainly comprises following stepRapid:
One, batching: take following composition by galvanized steel plain sheet target component content proportioning, by weight percentage, 0.30-0.35C、0.60-0.80Si、2.50-2.80Mn、0.10-0.20Al、0.30-0.50Cr、0.30-0.50Mo、0.15-0.20Ti, 0.008-0.01B, 0.005 following S, 0.005 following N, surplus is Fe and inevitable impurity;
Two, melting and casting: the raw material preparing is added to hot smelting in vacuum fusion stove, subsequently cooling with 0.5-1 DEG C/sSpeed, implements casting;
Three, hot rolling: the strand obtaining is implemented to hot rolling, finishing temperature after soaking 3-5h at 1200 DEG C of-1250 DEG C of temperatureFor 900-950 DEG C, after hot rolling, be cooled to 600 DEG C of left and right with the cooling velocity of 100-150 DEG C/s and batch;
Four, cold rolling: it is 75-80% that the steel plate that hot rolling is obtained carries out implementing cold rolling, cold rolling reduction ratio after pickling;
Five, galvanizing: cold-rolled steel sheet is heated in annealing furnace to 720-760 DEG C and be incubated 2-3min, subsequently with 30-50DEG C/cooling velocity of s is cooled to 450-500 DEG C and implements galvanizing;
Six, Alloying Treatment: steel plate after galvanizing is heated to 600-650 DEG C again and implements Alloying Treatment.
As preferably, in the atmosphere of described annealing furnace, contain the hydrogen of 50-60vol.%.
As preferably, in the coating of described galvanized steel plain sheet, be 5-6wt.% containing Fe amount.
As preferably, in the melt of described galvanizing, Zn content is more than 98wt.%, and the content of Pb is 0.05-0.1wt%, the content of Cd is below 0.01wt.%.
The invention has the advantages that: chosen the proportioning of the each alloying element of hot-dip galvanizing sheet steel, can greatly improve steel plate strongDegree, effectively controlled intensity by each processing step simultaneously and improved the adverse effect of bringing, prepared one have concurrently high strength,The hot-dip galvanizing sheet steel of excellent corrosion resistance and processing characteristics.
Detailed description of the invention
Embodiment 1-3, and comparative example 1#-9#:
One, batching: using the alloying component of table 1 as target component, take former by galvanized steel plain sheet target component content proportioningMaterial;
Two, melting and casting: the raw material preparing is added to hot smelting in vacuum fusion stove, subsequently with the cooling speed of 0.8 DEG C/sDegree, implements casting;
Three, hot rolling: the strand obtaining is implemented to hot rolling after soaking 4h at 1230 DEG C of temperature, and finishing temperature is 920 DEG C, heatAfter rolling, being cooled to 600 DEG C of left and right with the cooling velocity of 130 DEG C/s batches;
Four, cold rolling: it is 78% that the steel plate that hot rolling is obtained carries out implementing cold rolling, cold rolling reduction ratio after pickling;
Five, galvanizing: cold-rolled steel sheet is heated in annealing furnace to 740 DEG C and be incubated 2.5min, subsequently with 40 DEG C/s'sCooling velocity is cooled to 480 DEG C and implements galvanizing;
Six, Alloying Treatment: steel plate after galvanizing is heated to 620 DEG C again and implements Alloying Treatment.
In table 1, tensile strength and extensibility all test and obtain by conventional method; Corrosion proof evaluation adopts GBNSS salt spray test, steel plate area 10cm2, testing time 72h, day weight loss be greater than the counting of 15g/m2 ×, what be less than countsZero; Whether plating has obvious bad order by visually observing coating surface, have to be ×, nothing is zero.
Result of the test from table 1:
C is as the main alloy element of steel plate, and its content has material impact for intensity and the combination property of steel plate,In order to meet the high-intensity requirement of steel plate, the weight percentage of the preferred C of the present invention exceedes 0.3, but too much C content will makeExtensibility wretched insufficiency and affect the processing characteristics of steel plate, therefore must ensure that its content is below 0.35.
Si is main intensified element, and its content is self-evident for the importance that ensures armor plate strength, in the present invention, establishesThe weight percentage of meter Si exceedes 0.6 to obtain enough solid solution strengthening effects, but Si is oxidizable element, too much interpolationCan cause the selective oxidation of surface of steel plate, can cause plating performance variation simultaneously, and then affect other performances such as corrosion resistance, because ofThis requires its addition not exceed 0.8.
Mn is also main intensified element, and its mechanical property that can effectively ensure steel plate by improvement annealing property etc. is with strongDegree, the preferred Mn weight percentage of the present invention exceedes 2.5, but the membership that adds of too much Mn obviously worsens ductility etc., thus leadCause poor processability, and can cause plating performance variation, and then affect other performances such as corrosion resistance, therefore require its interpolationAmount does not exceed 2.8.
Al adds element mainly as deoxidation, and its interpolation can offset that the intensified element such as Si, Mn brings to a great extentAdverse effect, for making it give full play to deoxidation, should at least ensure that its weight percentage exceedes 0.1, but too much interpolationIts deoxidation effect can be saturated, also can cause the generation of the thick crystalline phases such as aluminium oxide simultaneously and worsen processing characteristics etc., therefore itsContent is preferably in below 0.2.
Cr is mainly as the interpolation element that improves Annealing Property, and for bringing into play its effect, its addition should exceed 0.3 weightAmount percentage composition, but too much interpolation can worsen plating etc., therefore controls its content below 0.5.
Ti also adds mainly as intensified element, and it not only can improve steel plate greatly by the formation of hardening constituentIntensity, can also effectively prevent peeling off of coating, for making it bring into play above-mentioned effect, its weight percentage at least should be0.15, but excessive interpolation likely can make hardening constituent thick and worsen processing characteristics, also can worsen on the contrary steel plate simultaneouslyPaintability, therefore should control its content and be less than 0.2.
The interpolation of B is played obvious invigoration effect by grain refinement, and for bringing into play above-mentioned effect, its addition should ensureAt 0.008 weight percentage, but excessive interpolation can form boride precipitated phase and worsen processing characteristics, therefore needs to controlIts content is less than 0.01.
S must be controlled at below 0.005 as the weight percentage of impurity element, otherwise meeting affect steel plate greatlyProcessing characteristics and decay resistance.
N is also impurity element, for fear of the Nitride Phase of its formation titanium, boron etc., and must the strict weight percent of controlling NContent is below 0.005.
Consider, the hot-dip galvanizing sheet steel in embodiment 2 has the most excellent combination property.
Table 1
In addition also investigated the impact of each technological parameter in the whole preparation process of steel plate, specifically referring to table 2, Qi ZhonggangThe composition of plate is in the same manner as in Example 2.
Result by table 2 can be known by inference:
In casting process, produce segregation for fear of intensified element, make the cooling velocity of casting at 0.5 DEG C/s as far as possibleAbove, but too high cooling velocity can not obtain extra effect, and therefore the upper limit is controlled at 1 DEG C/s.
Soak step must ensure enough temperature and times, further to make the intensified element in strand can be evenChange and avoid segregation, for meeting above-mentioned requirements, soaking temperature should be at least 1200 DEG C, and soaking time should be at least 3h, undueSoaking can not be played extra effect.
Cold rolling reduction ratio should ensure more than 75%, otherwise it is high realizing to be difficult to meet the requirement of grain refinementIntensity.
The temperature and time of annealing must be controlled well, and too high annealing temperature and time can cause the serious evil of processing characteristicsChange, corrosion resistance and plating are also affected simultaneously. And annealing after cooling velocity should be controlled at 50 DEG C/below s, otherwiseAlso can cause the deterioration of processing characteristics. In addition, the hydrogen that preferably contains 50-60vol.% in the atmosphere of annealing furnace, like thisCan better suppress the selective oxidation of surface of steel plate, thereby make follow-up hot galvanizing process more smooth, avoid platingCan be poor, thus improve corrosion resistance, plating and the processing characteristics of steel plate, bring into play above-mentioned effect under be limited to 50vol.%, too muchHydrogen content not must and can only increase cost.
For meeting the plating requirement of alloy system of the present invention, must control plating temperature and reach 450 DEG C, simultaneously for improving platingCover performance, preferably in the melt of galvanizing, Zn content is more than 98wt.%, and the content of Pb is 0.05-0.1wt%, the content of CdBelow 0.01wt.%, although too low Pb content is more conducive to environmental protection needs, be to exist for the plating performance of alloy systemNot enough, but in order to meet environmental requirement, still should control Pb content below 0.1wt%.
The temperature of Alloying Treatment should be at least 600 DEG C, otherwise can not play the effect of adjusting Coating composition, but alloyingTemperature can not be too high, otherwise can cause the adhesion property variation of coating, it is many that defect becomes. Preferably in coating, Fe amount is 5-6wt.％。
Table 2
The present invention is by the proportioning of the intensified element of adjustment hot-dip galvanizing sheet steel, and control preparation technology parameter, has obtainedHigh strength has the hot-dip galvanizing sheet steel of excellent anticorrosive and processing characteristics concurrently simultaneously. The foregoing is only preferred reality of the present inventionExecute example, not thereby limit the scope of the claims of the present invention, every equivalent structure transformation that utilizes description of the present invention to do,Or be directly or indirectly used in other relevant technical fields, be all in like manner included in scope of patent protection of the present invention.
Claims (3)
1. a preparation method for high-strength hot-dip galvanizing sheet steel, is characterized in that:
One, batching: take following composition by galvanized steel plain sheet target component content proportioning, by weight percentage, 0.30-0.35C,0.60-0.80Si、2.50-2.80Mn、0.10-0.20Al、0.30-0.50Cr、0.30-0.50Mo、0.15-0.20Ti、0.008-0.01B, 0.005 following S, 0.005 following N, surplus is Fe and inevitable impurity;
Two, melting and casting: the raw material preparing is added to hot smelting in vacuum fusion stove, subsequently with the cooling velocity of 0.5-1 DEG C/s,Implement casting;
Three, hot rolling: the strand obtaining is implemented to hot rolling after soaking 3-5h at 1200 DEG C of-1250 DEG C of temperature, and finishing temperature is900-950 DEG C, is cooled to 600 DEG C with the cooling velocity of 100-150 DEG C/s after hot rolling and batches;
Four, cold rolling: it is 75-80% that the steel plate that hot rolling is obtained carries out implementing cold rolling, cold rolling reduction ratio after pickling;
Five, galvanizing: cold-rolled steel sheet is heated in annealing furnace to 720-760 DEG C and be incubated 2-3min, subsequently with 30-50 DEG C/sCooling velocity be cooled to 450-500 DEG C implement galvanizing;
Six, Alloying Treatment: steel plate after galvanizing is heated to 600-650 DEG C again and implements Alloying Treatment,
In the melt of described galvanizing, Zn content is more than 98wt.%, and the content of Pb is 0.05-0.1wt%, and the content of Cd isBelow 0.01wt.%.
2. the preparation method of a kind of high-strength hot-dip galvanizing sheet steel according to claim 1, is characterized in that: described annealing furnaceIn atmosphere, contain the hydrogen of 50-60vol.%.
3. the preparation method of a kind of high-strength hot-dip galvanizing sheet steel according to claim 1, is characterized in that: described galvanized steel plain sheetCoating in be 5-6wt.% containing Fe amount.
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| JP6271067B1 (en) * | 2017-06-01 | 2018-01-31 | 日新製鋼株式会社 | High-strength Zn-Al-Mg-based surface-coated steel sheet and method for producing the same |
| JP6962452B2 (en) | 2018-03-28 | 2021-11-05 | Ｊｆｅスチール株式会社 | High-strength alloyed hot-dip galvanized steel sheet and its manufacturing method |
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| CN101429638A (en) * | 2008-11-28 | 2009-05-13 | 常熟华冶薄板有限公司 | Processing method for continuous hot-dipping galvanizing steel strip and apparatus used in the method |
| 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 |
| JP5114691B2 (en) * | 2010-06-14 | 2013-01-09 | 新日鐵住金株式会社 | Hot stamping molded body, hot stamping steel plate manufacturing method, and hot stamping molded body manufacturing method |
| CN103717773A (en) * | 2011-07-29 | 2014-04-09 | 新日铁住金株式会社 | High-strength galvanized steel sheet having superior bendability and method for producing same |
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| JP2002004018A (en) * | 2000-06-22 | 2002-01-09 | Nippon Steel Corp | High strength hot-dip galvanized steel sheet having good corrosion resistance after coating and good press- workability, and coated steel sheet |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101429638A (en) * | 2008-11-28 | 2009-05-13 | 常熟华冶薄板有限公司 | Processing method for continuous hot-dipping galvanizing steel strip and apparatus used in the method |
| 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 |
| JP5114691B2 (en) * | 2010-06-14 | 2013-01-09 | 新日鐵住金株式会社 | Hot stamping molded body, hot stamping steel plate manufacturing method, and hot stamping molded body manufacturing method |
| CN103717773A (en) * | 2011-07-29 | 2014-04-09 | 新日铁住金株式会社 | High-strength galvanized steel sheet having superior bendability and method for producing same |
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