CN102888578A - Method for producing hot-dip galvanized steel plate having excellent surface friction characteristics - Google Patents
Method for producing hot-dip galvanized steel plate having excellent surface friction characteristics Download PDFInfo
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- CN102888578A CN102888578A CN2011102026407A CN201110202640A CN102888578A CN 102888578 A CN102888578 A CN 102888578A CN 2011102026407 A CN2011102026407 A CN 2011102026407A CN 201110202640 A CN201110202640 A CN 201110202640A CN 102888578 A CN102888578 A CN 102888578A
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Abstract
The invention discloses a method for producing a hot-dip galvanized steel plate having excellent surface friction characteristics. The method mainly comprises the following steps of hot-dip galvanizing, finishing, withdrawal and straightening, surface after-treatment, drying and oil coating. The hot-dip galvanized steel plate obtained by the method has an inorganic chemical conversion coating having excellent surface properties on the surface. The inorganic chemical conversion coating has a lubricating function and can improve surface friction characteristics and impact molding properties of the hot-dip galvanized steel plate.
Description
Technical field
The present invention relates to a kind of manufacture method of steel plate, relate in particular to a kind of manufacture method of hot-dip galvanizing sheet steel.
Background technology
Hot-dip galvanizing sheet steel is a kind of common product of production field of metallurgy, and its basic production craft step comprises: uncoiling, straightening, welding, degreasing, annealing, zinc-plated, cooling, polishing, straightening, oiling, batch.Early stage hot-dip galvanizing sheet steel is mainly used in building trade.
Along with hot-dip galvanizing sheet steel the applying of household electric appliances, the hot-dip galvanizing sheet steel of anti-the fingerprint has appearred.Be CN1974836 such as publication number, open day is on June 6th, 2007, the Chinese patent literature that name is called " a kind of manufacture method of hot galvanized fingerprint-proof steel plate " discloses the manufacture method of hot galvanized fingerprint-proof steel plate, and this manufacture method is to have increased the anti-fingerprint film treatment process of roller coat in the production process of traditional hot-dip galvanizing sheet steel.This technical scheme is to form one deck organic film by the mode that roller coat is processed on the hot-dip galvanizing sheet steel surface, to improve corrosion resistance nature and the anti-stain characteristic energy of steel plate.This product is mainly used in household electric appliances or building trade.
Development and progress along with the hot-galvanized steel board production technology, because hot-dip galvanizing sheet steel has superior corrosion resistance nature and surface quality, and good weldability and coating, so that it is in recent years in automobile industry, particularly at Car Industry, be widely used.Because the production characteristic of automobile industry product, be used for the hot-dip galvanizing sheet steel of automobile industry product, its surface is not normally without (it has the related surperficial organic film of patent documentation that publication number is CN1974836) of any processing.Simultaneously, the rigidity of galvanizing layer of hot-dip galvanizing sheet steel is low, has larger frictional force when stamping and between the mould, and this can affect the plasticity of steel plate, even steel plate cracking can cause punching press the time; This is external when stamping, and larger frictional force also can cause mould that sticking zinc phenomenon easily occurs, thereby affects the stamping parts surface quality.
For addressing the above problem, Japan has proposed the technical scheme of re-plating one deck hard iron-based alloy layer on the hot galvanized layer surface.Although this technical scheme can solve the large problem of above-mentioned hot-dip galvanizing sheet steel skin friction force preferably, but this Technology Need increases the electroplating processes operation at galvanization production line, increase after the electroplating processes operation not only so that the pot galvanize production process is complicated, and greatly increased production cost.
Summary of the invention
The object of the present invention is to provide a kind of production method with hot-dip galvanizing sheet steel of good surface rubbing characteristics, it forms an inorganic chemistry conversion film by the surface at hot-dip galvanizing sheet steel, is intended to solve the existing hot-dip galvanizing sheet steel problems such as frictional force is large when stamping and between the mould, forming property is not good, the stamping parts surface quality is bad.
Technical conceive of the present invention is: form one deck inorganic chemistry conversion film as thin as a wafer on the hot-dip galvanizing sheet steel surface, the inorganic chemistry conversion film that forms has lubricating function, can improve the surface friction characteristic of hot-dip galvanizing sheet steel, can also improve the flowability in the hot-dip galvanizing sheet steel stamping process, namely improve the impact briquetting performance of steel plate; Simultaneously, this inorganic chemistry conversion film also should not have any detrimentally affect to follow-up production process.
According to the foregoing invention purpose, the invention provides a kind of production method with hot-dip galvanizing sheet steel of good surface rubbing characteristics, comprise the following steps:
(1) makes substrate;
(2) substrate is carried out pot galvanize and processes after cooling: contain the Al of 0.19～0.21wt% in the zinc liquid of pot galvanize, zinc liquid temperature is 455～465 ℃, and the content of impurity Pb or Sb in the zinc liquid is controlled in the 0.003wt%;
(3) hot-dip galvanizing sheet steel being carried out polishing to the surface roughness Ra of hot-dip galvanizing sheet steel is 0.7～1.3 μ m;
(4) straightening;
(5) surperficial aftertreatment: adopt the mode of roller coat at hot-dip galvanizing sheet steel surface uniform ground coated surfaces treatment agent, described surface treatment agent is Mn (H
2PO
4)
2, H
3PO
4With water-soluble polymers RO (CH
2CH
2O)
nThe mixed aqueous solution of H, the pH value of described mixed aqueous solution is 2～3, Mn in the described mixed aqueous solution
2+Concentration be 2～4g/L, PO
4 3-/ Mn
2+Be controlled at 4.5～6, water-soluble polymers RO (CH
2CH
2O)
nThe concentration of H is 0.1～0.5g/L, described water-soluble polymers RO (CH
2CH
2O)
nAmong the H, R is H or is the following Fatty Alcohol(C12-C14 and C12-C18) of 12 C, and when R was H, the span of n was 100～300, and when R was 12 Fatty Alcohol(C12-C14 and C12-C18) below the C, the span of n was 8～10;
(6) drying: make the hot-dip galvanizing sheet steel surface reach 80～150 ℃ and carry out drying, thereby the surface treatment agent on hot-dip galvanizing sheet steel surface is solidified;
(7) oiling: at hot-dip galvanizing sheet steel surface-coated 0.5～2g/m
2Rust preventive lubricating oil.
Above-mentioned production method with hot-dip galvanizing sheet steel of good surface rubbing characteristics comprises that also step (8) batches.
Need to prove, although the technological core of this case is to form the inorganic chemistry conversion film at surperficial post-processing step, if but only emphasize surperficial post-processing step, and do not have in other each steps a suitably cooperation of processing parameter, the formation effect of this inorganic chemistry conversion film also is not good, can not realize the technique effect that the technical program will reach.Specifically:
In the pot galvanize step, Al content in the zinc liquid is except affecting the bonding force between zinc coating and the substrate, also can affect the surface property of hot-dip galvanizing sheet steel, for the technical program, Al content is lower than 0.19wt%, then owing between zinc coating and substrate, forming too much zn-fe alloy layer, and cause zinc layer bonding force to reduce, can occur Zinc Scaling in the stamping process; Al content is higher than 0.21wt%, then can affect the reaction between the surface treatment agent and zinc layer in the follow-up surperficial post-processing step, thereby affects the implementation result of the technical program.The control zinc liquid temperature is in order to guarantee the bonding force of zinc layer at 455～465 ℃, and zinc liquid temperature is crossed low or too high, all can cause zinc layer bonding force to descend;
Polishing step surface property same and the described hot-dip galvanizing sheet steel of the technical program is closely related, if roughness Ra is too little, then the adsorptivity to oil product reduces behind the hot-dip galvanizing sheet steel oil surface, is unfavorable for storing and keeping oil film, and this can affect the stamping performance of steel plate; And if roughness Ra is too large, can be unfavorable for again the reduction of hot-dip galvanizing sheet steel skin friction force;
In drying step, if temperature is lower than 80 ℃, then be unfavorable for forming the inorganic chemistry conversion film with lubricating function, if temperature is higher than 150 ℃, can cause again inorganic chemistry conversion film generation oxidation;
In the oiling step, be coated with 0.5～2g/m at surface of steel plate
2Rust preventive lubricating oil, can further improve the punching press lubricity of hot-dip galvanizing sheet steel.
In the production method of above-mentioned hot-dip galvanizing sheet steel with good surface rubbing characteristics, adopt the processing parameter of the mode coated surfaces treatment agent of roller coat to be in the described step (5): the speed of the upper surface application roll of hot-dip galvanizing sheet steel is 130～140% of hot-dip galvanizing sheet steel travelling speed, the speed of upper surface carrying roller is 100～110% of hot-dip galvanizing sheet steel travelling speed, and the pressure between upper surface carrying roller and the upper surface application roll is 45～55kg; The speed of the lower surface application roll of hot-dip galvanizing sheet steel is 130～140% of hot-dip galvanizing sheet steel travelling speed, the speed of lower surface carrying roller is 100～110% of hot-dip galvanizing sheet steel travelling speed, and the pressure between lower surface carrying roller and the lower surface application roll is 100～110kg.
In the production method of above-mentioned hot-dip galvanizing sheet steel with good surface rubbing characteristics, the travelling speed of hot-dip galvanizing sheet steel is 100～200m/min in the described step (5).
Above-mentioned coated technique parameter is based upon on the lot of experiments basis, hot-dip galvanizing sheet steel according to this coated technique parameter production, the inorganic chemistry conversion film that can form even thickness, not have strip flaw, have lubricating function on the hot-dip galvanizing sheet steel surface, thereby so that hot-dip galvanizing sheet steel has extraordinary surface friction characteristic, can significantly reduce the skin friction coefficient of hot-dip galvanizing sheet steel, and in the punching press friction process, keep stable, greatly improve the flowability in the hot-dip galvanizing sheet steel stamping process, namely improved the impact briquetting performance of steel plate.
In the technical program, surface treatment agent is the aqueous solution, and concentration is lower, so its viscosity is very low.The contriver finds in process of the test, and the weight of the inorganic chemistry conversion film that the hot-dip galvanizing sheet steel surface forms depends primarily on the concentration of surface treatment agent, and not obvious with the relation of coated technique parameter.But the surface quality of the inorganic chemistry conversion film of coated technique parameter and formation has direct relation.Evidence, not if suitably not mating of application roll speed or carrying roller speed and hot-dip galvanizing sheet steel travelling speed, or the pressure coupling is inappropriate between up/down surface band material roller and the application roll, all can't form desirable inorganic chemistry conversion film on the hot-dip galvanizing sheet steel surface, easily produce various surface imperfection, also can affect the use properties of hot-dip galvanizing sheet steel.
In the production method of above-mentioned hot-dip galvanizing sheet steel with good surface rubbing characteristics, adopt N in the pot galvanize treating processes of described step (2)
2Carry out the air knife winding-up.Adopt N
2Gas as air knife can obtain the good Several Thiourea Derivatives on Zinc Plate Surface of surface property, if adopt air as the gas of air knife, then can cause the oxidation on zinc layer surface, and then affects the reaction between the surface treatment agent and zinc layer in the surperficial post-processing step.
In the production method of above-mentioned hot-dip galvanizing sheet steel with good surface rubbing characteristics, in the pot galvanize treating processes of described step (2), the temperature that substrate enters the zinc pot is 460～480 ℃.It is in order to guarantee the bonding force of substrate and zinc layer, to prevent Zinc Scaling that the temperature that substrate is entered the zinc pot is controlled in this scope.
The present invention is by adopting technique scheme, so that the hot-dip galvanizing sheet steel of producing has formed the inorganic chemistry conversion film with excellent surface properties on its surface, this inorganic chemistry conversion film has lubricating function, the surface friction characteristic of hot-dip galvanizing sheet steel can be improved, the impact briquetting performance of hot-dip galvanizing sheet steel can also be improved.
Description of drawings
Fig. 1 is the structural representation of the roller coating machine that adopts of surperficial post-processing step.
Fig. 2 has shown the skin friction coefficient of the hot-dip galvanizing sheet steel that hot-dip galvanizing sheet steel that embodiment of the invention 1-4 is related and Comparative Examples are related-friction frequency curve figure.
Embodiment
Adopt following step to prepare hot-dip galvanizing sheet steel, table 1 has been listed the concrete technology parameter of each step among the embodiment 1-4:
(1) carry out successively uncoiling, straightening, welding, degreasing, annealing manufacturing substrate, substrate is the IF steel, and specification is 0.55 * 924mm;
(2) substrate being carried out pot galvanize processes: contain the Al of 0.19～0.21wt% in the zinc liquid of pot galvanize, zinc liquid temperature is 455～465 ℃, and the temperature that substrate enters the zinc pot is 460～480 ℃, adopts N
2Carry out the air knife winding-up, the thickness of substrate two surperficial zinc layers is 60g/m
2
(3) cooling;
(4) hot-dip galvanizing sheet steel being carried out polishing to the surface roughness Ra of hot-dip galvanizing sheet steel is 0.7～1.3 μ m;
(5) straightening;
(6) adopt roller coating machine (wherein 1 represents application roll, and 2 represent carrying rollers, and P represents the traffic direction of hot-dip galvanizing sheet steel, Q presentation surface treatment agent) as shown in Figure 1 to apply Mn (H on hot-dip galvanizing sheet steel surface uniform ground
2PO
4)
2, H
3PO
4With water-soluble polymers RO (CH
2CH
2O)
nThe mixed aqueous solution of H (surface treatment agent), the pH value of mixed aqueous solution is 2～3, Mn in the mixed aqueous solution
2+Concentration be 2～4g/L, PO
4 3-/ Mn
2+Be controlled at 4.5～6, water-soluble polymer content is 0.1～0.5g/L; The coated technique parameter is controlled to be: the travelling speed of hot-dip galvanizing sheet steel is 100～200m/min; The speed of the upper surface application roll of hot-dip galvanizing sheet steel is 130～140% of hot-dip galvanizing sheet steel travelling speed, the speed of upper surface carrying roller is 100～110% of hot-dip galvanizing sheet steel travelling speed, and the pressure between upper surface carrying roller and the upper surface application roll is 45～55kg; The speed of the lower surface application roll of hot-dip galvanizing sheet steel is 130～140% of hot-dip galvanizing sheet steel travelling speed, the speed of lower surface carrying roller is 100～110% of hot-dip galvanizing sheet steel travelling speed, and the pressure between lower surface carrying roller and the lower surface application roll is 100～110kg;
(7) drying: adopt warm air drying, make the hot-dip galvanizing sheet steel surface reach 80～150 ℃;
(8) cooling;
(9) at hot-dip galvanizing sheet steel surface-coated 0.5～2g/m
2Rust preventive lubricating oil;
(10) batch.
Table 1.
In the table 1, upper application roll rotating speed, upper carrying roller rotating speed, lower application roll rotating speed and lower carrying roller rotating speed all are expressed as the per-cent of hot-dip galvanizing sheet steel travelling speed.
Evaluation:
(1) flat board draws the method test: adopt flat board to draw the skin friction coefficient (or being called the initial friction coefficient) of method test implementation example 1～4 and Comparative Examples (hot-dip galvanizing sheet steel that adopts ordinary method to make) sample, test simultaneously through the frictional coefficient after repeatedly rubbing.Test condition: positive pressure P=2000N, drawing speed V=300mm/min is coated with 550HN oil and measures after 4 hours, each measure draw length 110mm.
(2) rush cup test: according to GB/T15825.3-2008, embodiment 1～4 is rushed cup test with Comparative Examples (hot-dip galvanizing sheet steel that adopts ordinary method to make) sample.The maximum drawing force of specimen (the mug high (punch displacement) when sample φ=100mm), sample cracking (sample φ=120mm).Test conditions: punch φ=50mm, V=15mm/min is coated with 550HN oil.
Table 2 and Fig. 2 have listed the result of above-mentioned two tests.
Table 2.
In the table 2, frictional coefficient changes the per-cent that refers to the relative Comparative Examples initial friction of embodiment index variation; The maximum drawing force variation refers to the relative Comparative Examples maximum drawing force of embodiment percentage change; Mug High variation refers to the per-cent of the mug High variation of the relative Comparative Examples of embodiment.
Can find out from the result of table 2 and Fig. 2 demonstration:
(1) compare with Comparative Examples, the skin friction coefficient of the hot-dip galvanizing sheet steel that embodiment 1-4 is related obviously reduces, and initial friction coefficient reduction amplitude surpasses 10%; Along with the increase of the number of times that repeatedly rubs, the skin friction coefficient of comparative example sharply increases, and the frictional coefficient of the related hot-dip galvanizing sheet steel of embodiment 1-4 does not only increase on the contrary and slightly descends.
(2) compare with Comparative Examples, the maximum drawing force of the hot-dip galvanizing sheet steel that embodiment 1-4 is related all descends in various degree, and mug height increases in various degree.
Thus, as seen adopt technical solutions according to the invention to produce the surface friction characteristic that hot-dip galvanizing sheet steel can effectively improve hot-dip galvanizing sheet steel, improve the flowability in the hot-dip galvanizing sheet steel stamping process, namely improve the impact briquetting performance of steel plate.
Be noted that above enumerate only for specific embodiments of the invention, obviously the invention is not restricted to above embodiment, many similar variations are arranged thereupon.If those skilled in the art all should belong to protection scope of the present invention from all distortion that content disclosed by the invention directly derives or associates.
Claims (7)
1. the production method with hot-dip galvanizing sheet steel of good surface rubbing characteristics is characterized in that, comprises the following steps:
(1) makes substrate;
(2) substrate is carried out cool off after pot galvanize is processed: contain the Al of 0.19～0.21wt% in the zinc liquid of pot galvanize, zinc liquid temperature is 455～465 ℃;
(3) hot-dip galvanizing sheet steel is carried out polishing until the surface roughness Ra of hot-dip galvanizing sheet steel is 0.7～1.3 μ m;
(4) straightening;
(5) surperficial aftertreatment: adopt the mode of roller coat at hot-dip galvanizing sheet steel surface uniform ground coated surfaces treatment agent, described surface treatment agent is Mn (H
2PO
4)
2, H
3PO
4With water-soluble polymers RO (CH
2CH
2O)
nThe mixed aqueous solution of H, the pH value of described mixed aqueous solution is 2～3, Mn in the described mixed aqueous solution
2+Concentration be 2～4g/L, PO
4 3-/ Mn
2+Be controlled at 4.5～6, water-soluble polymers RO (CH
2CH
2O)
nThe concentration of H is 0.1～0.5g/L, described water-soluble polymers RO (CH
2CH
2O)
nAmong the H, R is H or is the following Fatty Alcohol(C12-C14 and C12-C18) of 12 C, and when R was H, the span of n was 100～300, and when R was 12 Fatty Alcohol(C12-C14 and C12-C18) below the C, the span of n was 8～10;
(6) drying: make the hot-dip galvanizing sheet steel surface reach 80～150 ℃ and carry out drying;
(7) oiling: at hot-dip galvanizing sheet steel surface-coated 0.5～2g/m
2Rust preventive lubricating oil.
2. the production method with hot-dip galvanizing sheet steel of good surface rubbing characteristics as claimed in claim 1 is characterized in that, comprises that also step (8) batches.
3. the production method with hot-dip galvanizing sheet steel of good surface rubbing characteristics as claimed in claim 1 or 2, it is characterized in that: adopt the processing parameter of the mode coated surfaces treatment agent of roller coat to be in the described step (5): the speed of the upper surface application roll of hot-dip galvanizing sheet steel is 130～140% of hot-dip galvanizing sheet steel travelling speed, the speed of upper surface carrying roller is 100～110% of hot-dip galvanizing sheet steel travelling speed, and the pressure between upper surface carrying roller and the upper surface application roll is 45～55kg; The speed of the lower surface application roll of hot-dip galvanizing sheet steel is 130～140% of hot-dip galvanizing sheet steel travelling speed, the speed of lower surface carrying roller is 100～110% of hot-dip galvanizing sheet steel travelling speed, and the pressure between lower surface carrying roller and the lower surface application roll is 100～110kg.
4. the production method with hot-dip galvanizing sheet steel of good surface rubbing characteristics as claimed in claim 3 is characterized in that, adopts N in the pot galvanize treating processes of described step (2)
2Carry out the air knife winding-up.
5. the production method with hot-dip galvanizing sheet steel of good surface rubbing characteristics as claimed in claim 3 is characterized in that, in the pot galvanize treating processes of described step (2), the temperature that substrate enters the zinc pot is 460～480 ℃.
6. the production method with hot-dip galvanizing sheet steel of good surface rubbing characteristics as claimed in claim 4 is characterized in that, in the pot galvanize treating processes of described step (2), the temperature that substrate enters the zinc pot is 460～480 ℃.
7. the production method with hot-dip galvanizing sheet steel of good surface rubbing characteristics as claimed in claim 3 is characterized in that, the travelling speed of hot-dip galvanizing sheet steel is 100～200m/min in the described step (5).
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| CN104152834A (en) * | 2014-08-11 | 2014-11-19 | 马钢(集团)控股有限公司 | Method for manufacturing hot galvanized plate with high-conductivity surface |
| CN105296907A (en) * | 2015-11-12 | 2016-02-03 | 首钢总公司 | Method for improving quality of galvanized layer of galvanized automobile sheet |
| CN104152834B (en) * | 2014-08-11 | 2017-01-04 | 马钢(集团)控股有限公司 | A kind of manufacture method of surface high connductivity heat zinc coating plate |
| CN109440040A (en) * | 2018-12-25 | 2019-03-08 | 宜兴大平杆塔制造有限公司 | The anti-friction treatment process of joint face after steel construction is zinc-plated |
| CN112410768A (en) * | 2020-10-30 | 2021-02-26 | 马鞍山钢铁股份有限公司 | Galvanized steel sheet surface treatment agent, preparation method of surface treatment agent, self-lubricating galvanized steel sheet and preparation method of steel sheet |
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| CN104152834A (en) * | 2014-08-11 | 2014-11-19 | 马钢(集团)控股有限公司 | Method for manufacturing hot galvanized plate with high-conductivity surface |
| CN104152834B (en) * | 2014-08-11 | 2017-01-04 | 马钢(集团)控股有限公司 | A kind of manufacture method of surface high connductivity heat zinc coating plate |
| CN105296907A (en) * | 2015-11-12 | 2016-02-03 | 首钢总公司 | Method for improving quality of galvanized layer of galvanized automobile sheet |
| CN109440040A (en) * | 2018-12-25 | 2019-03-08 | 宜兴大平杆塔制造有限公司 | The anti-friction treatment process of joint face after steel construction is zinc-plated |
| CN109440040B (en) * | 2018-12-25 | 2019-08-30 | 宜兴大平杆塔制造有限公司 | The anti-friction treatment process of joint face after steel construction is zinc-plated |
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