CN102888578B - 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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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, particularly relate to a kind of manufacture method of hot-dip galvanizing sheet steel.
Background technology
Hot-dip galvanizing sheet steel is a kind of usual products 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 applying in household electric appliances, there is the hot-dip galvanizing sheet steel of resistance to fingerprint.If publication number is CN1974836, publication date is on June 6th, 2007, name is called that the Chinese patent literature of " 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 in the production process of traditional hot-dip galvanizing sheet steel, add the resistance to fingerprint film treatment process of roller coat.This technical scheme forms one deck organic film, to improve corrosion resistance nature and the anti-stain characteristic energy of steel plate by the mode of roller coat process on hot-dip galvanizing sheet steel surface.This product is mainly used in household electric appliances or building trade.
Along with the development and progress of 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, make it in recent years in automobile industry, particularly at Car Industry, be widely used.Due to the production characteristic of automobile industry product, for the hot-dip galvanizing sheet steel of automobile industry product, its surface is not normally without (it has the surperficial organic film of publication number involved by the patent documentation of CN1974836) of any process.Meanwhile, the rigidity of galvanizing layer of hot-dip galvanizing sheet steel is low, has larger frictional force when stamping and between mould, and this can affect the plasticity of steel plate, steel plate cracking when even can cause punching press; This external stamping time, larger frictional force also can cause mould that sticky zinc phenomenon easily occurs, thus affects stamping parts surface quality.
For solving the problem, Japan proposes the technical scheme at hot galvanized layer re-plating one deck hard iron-based alloy layer on the 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 needs to increase electroplating processes operation at galvanization production line, not only make pot galvanize production process complicated after increasing electroplating processes operation, and considerably increase production cost.
Summary of the invention
The object of the present invention is to provide a kind of production method with the hot-dip galvanizing sheet steel of good surface rubbing characteristics, it is by forming an inorganic chemistry conversion film on the surface of hot-dip galvanizing sheet steel, is intended to solve the existing hot-dip galvanizing sheet steel problems such as when stamping and between mould, frictional force is large, forming property is not good, stamping parts surface quality is bad.
Technical conceive of the present invention is: form the very thin inorganic chemistry conversion film of one deck on hot-dip galvanizing sheet steel surface, the inorganic chemistry conversion film formed has lubricating function, the surface friction characteristics of hot-dip galvanizing sheet steel can be improved, the mobility in hot-dip galvanizing sheet steel stamping process can also be improved, namely improve the impact briquetting performance of steel plate; Meanwhile, this inorganic chemistry conversion film also should not have any detrimentally affect to follow-up production process.
According to foregoing invention object, the invention provides a kind of production method with the hot-dip galvanizing sheet steel of good surface rubbing characteristics, comprise the following steps:
(1) substrate is manufactured;
(2) cool after substrate being carried out pot galvanize process: the Al containing 0.19 ~ 0.21wt% in the zinc liquid of pot galvanize, zinc liquid temperature is 455 ~ 465 DEG C, controls within 0.003wt% by the content of impurity Pb or Sb in zinc liquid;
(3) carrying out polishing to the surface roughness Ra of hot-dip galvanizing sheet steel to hot-dip galvanizing sheet steel is 0.7 ~ 1.3 μm;
(4) straightening;
(5) surperficial aftertreatment: adopt the mode of roller coat at hot-dip galvanizing sheet steel uniformly 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 described mixed aqueous solution
2+concentration be 2 ~ 4g/L, PO
4 3-/ Mn
2+control 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)
nin H, R is H or is the fatty alcohol of 12 below C, and when R is H, the span of n is 100 ~ 300, and when R is the fatty alcohol of 12 below C, the span of n is 8 ~ 10;
(6) dry: to make hot-dip galvanizing sheet steel surface reach 80 ~ 150 DEG C and carry out drying, thus 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.
The above-mentioned production method with the hot-dip galvanizing sheet steel of good surface rubbing characteristics also comprises step (8) and batches.
It should be noted that, although the technological core of this case is to form inorganic chemistry conversion film at surface finishing steps, if but only emphasize surface finishing steps, and there is no the cooperation of suitable processing parameter in other each steps, the formation effect of this inorganic chemistry conversion film is also not good, can not realize the technique effect that the technical program will reach.Specifically:
In pot galvanize step, Al content in zinc liquid is except affecting the bonding force between zinc coating and 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 to forming too much zn-fe alloy layer between zinc coating and substrate, and cause zinc layers bonding force to reduce, in stamping process, there will be Zinc Scaling; Al content higher than 0.21wt%, then can affect the reaction in follow-up surface finishing steps between surface treatment agent and zinc layers, thus affect the implementation result of the technical program.Control zinc liquid temperature is the bonding force in order to ensure zinc layers at 455 ~ 465 DEG C, and zinc liquid temperature is too low or too high, and zinc layers bonding force all can be caused to decline;
The surface property of the hot-dip galvanizing sheet steel of polishing step equally and described in the technical program is closely related, if roughness Ra is too little, then reduce the adsorptivity of oil product after hot-dip galvanizing sheet steel oil surface, be unfavorable for storing and keep oil film, this can affect the stamping formabilily of steel plate; And if roughness Ra is too large, the reduction of hot-dip galvanizing sheet steel skin friction force can be unfavorable for again;
In drying step, if temperature is lower than 80 DEG C, be then unfavorable for being formed the inorganic chemistry conversion film with lubricating function, if temperature is higher than 150 DEG C, inorganic chemistry conversion film can be caused again to be oxidized;
In oiling step, be coated with 0.5 ~ 2g/m at surface of steel plate
2rust preventive lubricating oil, the punching press lubricity of hot-dip galvanizing sheet steel can be improved further.
Have in the production method of the hot-dip galvanizing sheet steel of good surface rubbing characteristics above-mentioned, in described step (5), the processing parameter of the mode coated surfaces treatment agent of employing roller coat is: 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 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 lower surface application roll is 100 ~ 110kg.
Have in the production method of the hot-dip galvanizing sheet steel of good surface rubbing characteristics above-mentioned, in described step (5), the travelling speed of hot-dip galvanizing sheet steel is 100 ~ 200m/min.
Above-mentioned coated technique parameter is based upon on lot of experiments basis, according to the hot-dip galvanizing sheet steel that this coated technique parameter is produced, the inorganic chemistry conversion film that thickness is even, do not have strip flaw, have lubricating function can be formed on hot-dip galvanizing sheet steel surface, thus make hot-dip galvanizing sheet steel have extraordinary surface friction characteristics, significantly can reduce the skin friction coefficient of hot-dip galvanizing sheet steel, and keep stable in punching press friction process, greatly improve the mobility in hot-dip galvanizing sheet steel stamping process, namely improve the impact briquetting performance of steel plate.
In the technical program, surface treatment agent is the aqueous solution, and concentration is lower, and therefore its viscosity is very low.Contriver finds in process of the test, and the weight of the inorganic chemistry conversion film that hot-dip galvanizing sheet steel surface is formed 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.Test proves, if application roll speed or carrying roller speed are not suitably mated with hot-dip galvanizing sheet steel travelling speed, or pressure match is inappropriate between up/down surface band material roller and application roll, all cannot form desirable inorganic chemistry conversion film on hot-dip galvanizing sheet steel surface, the various surface imperfection of easy generation, also can affect the use properties of hot-dip galvanizing sheet steel.
Have in the production method of the hot-dip galvanizing sheet steel of good surface rubbing characteristics above-mentioned, in the pot galvanize treating processes of described step (2), adopt N
2carry out 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 layers surface, and then affect the reaction in surface finishing steps between surface treatment agent and zinc layers.
Have in the production method of the hot-dip galvanizing sheet steel of good surface rubbing characteristics above-mentioned, in the pot galvanize treating processes of described step (2), the temperature that substrate enters zinc pot is 460 ~ 480 DEG C.Temperature substrate being entered zinc pot controls to be the bonding force in order to ensure substrate and zinc layers within the scope of this, prevents Zinc Scaling.
The present invention is by adopting technique scheme, the hot-dip galvanizing sheet steel produced is made to define the inorganic chemistry conversion film with excellent surface properties on its surface, this inorganic chemistry conversion film has lubricating function, the surface friction characteristics of hot-dip galvanizing sheet steel can be improved, the impact briquetting performance of hot-dip galvanizing sheet steel can also be improved.
Accompanying drawing explanation
The structural representation of the roller coating machine that Fig. 1 adopts for surface finishing steps.
Fig. 2 shows the skin friction coefficient-Rubbing number graphic representation of the hot-dip galvanizing sheet steel involved by embodiment of the present invention 1-4 and the hot-dip galvanizing sheet steel involved by comparative example.
Embodiment
Adopt following step to prepare hot-dip galvanizing sheet steel, table 1 lists the concrete technology parameter of each step in embodiment 1-4:
(1) carry out uncoiling, straightening, welding, degreasing, annealing manufacture substrate successively, substrate is IF steel, and specification is 0.55 × 924mm;
(2) substrate is carried out pot galvanize process: the Al containing 0.19 ~ 0.21wt% in the zinc liquid of pot galvanize, zinc liquid temperature is 455 ~ 465 DEG C, and the temperature that substrate enters zinc pot is 460 ~ 480 DEG C, adopts N
2carry out air knife winding-up, the thickness of the surperficial zinc layers of substrate two is 60g/m
2;
(3) cool;
(4) carrying out polishing to the surface roughness Ra of hot-dip galvanizing sheet steel to hot-dip galvanizing sheet steel is 0.7 ~ 1.3 μm;
(5) straightening;
(6) roller coating machine as shown in Figure 1 (wherein 1 represents application roll, and 2 represent carrying roller, and P represents the traffic direction of hot-dip galvanizing sheet steel, Q presentation surface treatment agent) is adopted uniformly to apply Mn (H at hot-dip galvanizing sheet steel
2pO
4)
2, H
3pO
4with water-soluble polymers RO (CH
2cH
2o)
nthe mixed aqueous solution (surface treatment agent) of H, the pH value of mixed aqueous solution is 2 ~ 3, Mn in mixed aqueous solution
2+concentration be 2 ~ 4g/L, PO
4 3-/ Mn
2+control 4.5 ~ 6, water-soluble polymer content is 0.1 ~ 0.5g/L; Coated technique state modulator is: 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 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 lower surface application roll is 100 ~ 110kg;
(7) dry: to adopt warm air drying, make hot-dip galvanizing sheet steel surface reach 80 ~ 150 DEG C;
(8) cool;
(9) at hot-dip galvanizing sheet steel surface-coated 0.5 ~ 2g/m
2rust preventive lubricating oil;
(10) batch.
Table 1.
In table 1, upper application roll rotating speed, upper carrying roller rotating speed, lower application roll rotating speed and lower carrying roller rotating speed are all expressed as the per-cent of hot-dip galvanizing sheet steel travelling speed.
Evaluation:
(1) dull and stereotyped drawing method test: adopt dull and stereotyped drawing method testing example 1 ~ 4 and the skin friction coefficient (or being called initial friction coefficient) of comparative example (adopting the hot-dip galvanizing sheet steel that ordinary method is obtained) sample, test the frictional coefficient after repeatedly rubbing simultaneously.Test condition: positive pressure P=2000N, drawing speed V=300mm/min, is coated with 550HN oil and measures after 4 hours, each drawing length 110mm measured.
(2) rush cup test: according to GB/T15825.3-2008, cup test is rushed to embodiment 1 ~ 4 and comparative example (adopting the obtained hot-dip galvanizing sheet steel of ordinary method) sample.Most mug high (punch displacement) (sample φ=120mm) during maximum drawing force (sample φ=100mm), the sample cracking of test sample.Test conditions: punch φ=50mm, V=15mm/min, is coated with 550HN oil.
Table 2 and Fig. 2 list the result of above-mentioned two tests.
Table 2.
In table 2, frictional coefficient change refers to the per-cent of embodiment relative contrast example initial friction index variation; Maximum drawing force change refers to embodiment relative contrast example maximum drawing force percentage change; Most mug High variation refers to the per-cent of the most mug High variation of embodiment relative contrast example.
Result as can be seen from table 2 and Fig. 2 show:
(1) compared with comparative example, the skin friction coefficient of the hot-dip galvanizing sheet steel involved by embodiment 1-4 obviously reduces, and initial friction coefficient reduces amplitude more than 10%; Along with the increase of Rubbing number repeatedly, the skin friction coefficient of comparative example sharply increases, and the frictional coefficient of hot-dip galvanizing sheet steel involved by embodiment 1-4 does not only increase and slightly declines on the contrary.
(2) compared with comparative example, the maximum drawing force of the hot-dip galvanizing sheet steel involved by embodiment 1-4 declines all in various degree, and most mug height increases in various degree.
Thus, the visible surface friction characteristics adopting technical solutions according to the invention production hot-dip galvanizing sheet steel effectively can improve hot-dip galvanizing sheet steel, improves the mobility in hot-dip galvanizing sheet steel stamping process, namely improves the impact briquetting performance of steel plate.
That enumerates it should be noted that above is only specific embodiments of the invention, obviously the invention is not restricted to above embodiment, has many similar changes thereupon.If all distortion that those skilled in the art directly derives from content disclosed by the invention or associates, protection scope of the present invention all should be belonged to.
Claims (6)
1. there is a production method for the hot-dip galvanizing sheet steel of good surface rubbing characteristics, it is characterized in that, comprise the following steps:
(1) substrate is manufactured;
(2) cool after substrate being carried out pot galvanize process: the Al containing 0.19 ~ 0.21wt% in the zinc liquid of pot galvanize, zinc liquid temperature is 455 ~ 465 DEG C;
(3) polishing is carried out to hot-dip galvanizing sheet steel until the surface roughness Ra of hot-dip galvanizing sheet steel is 0.7 ~ 1.3 μm;
(4) straightening;
(5) surperficial aftertreatment: adopt the mode of roller coat at hot-dip galvanizing sheet steel uniformly 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 described mixed aqueous solution
2+concentration be 2 ~ 4g/L, PO
4 3-/ Mn
2+control 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)
nin H, R is H or is the fatty alcohol of 12 below C, when R is H, the span of n is 100 ~ 300, and when R is the fatty alcohol of 12 below C, the span of n is 8 ~ 10, wherein, 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, and 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 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 lower surface application roll is 100 ~ 110kg;
(6) dry: to make hot-dip galvanizing sheet steel surface reach 80 ~ 150 DEG C and carry out drying;
(7) oiling: at hot-dip galvanizing sheet steel surface-coated 0.5 ~ 2g/m
2rust preventive lubricating oil.
2. there is the production method of the hot-dip galvanizing sheet steel of good surface rubbing characteristics as claimed in claim 1, it is characterized in that, also comprise step (8) and batch.
3. there is the production method of the hot-dip galvanizing sheet steel of good surface rubbing characteristics as claimed in claim 1, it is characterized in that, in the pot galvanize treating processes of described step (2), adopt N
2carry out air knife winding-up.
4. have the production method of the hot-dip galvanizing sheet steel of good surface rubbing characteristics as claimed in claim 1, it is characterized in that, in the pot galvanize treating processes of described step (2), the temperature that substrate enters zinc pot is 460 ~ 480 DEG C.
5. have the production method of the hot-dip galvanizing sheet steel of good surface rubbing characteristics as claimed in claim 3, it is characterized in that, in the pot galvanize treating processes of described step (2), the temperature that substrate enters zinc pot is 460 ~ 480 DEG C.
6. have the production method of the hot-dip galvanizing sheet steel of good surface rubbing characteristics as claimed in claim 1, it is characterized in that, in described step (5), the travelling speed of hot-dip galvanizing sheet steel is 100 ~ 200m/min.
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| CN105296907A (en) * | 2015-11-12 | 2016-02-03 | 首钢总公司 | Method for improving quality of galvanized layer of galvanized automobile sheet |
| 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 |
| CN112410768B (en) * | 2020-10-30 | 2023-06-23 | 马鞍山钢铁股份有限公司 | Galvanized steel sheet surface treating agent, preparation method of surface treating agent, self-lubricating galvanized steel sheet and preparation method of steel sheet |
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