CN105274301A - Method for producing iron-zinc alloy coated steel plate with yield strength being equal to or higher than 220 MPa - Google Patents
Method for producing iron-zinc alloy coated steel plate with yield strength being equal to or higher than 220 MPa Download PDFInfo
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Abstract
The invention discloses a method for producing an iron-zinc alloy coated steel plate with the yield strength being equal to or higher than 220 MPa. The method comprises the steps that molten iron desulphurization, smelting through a converter and continuous casting are conducted, so that a billet is formed; hot rolling is conducted; rolling is conducted; cold rolling is conducted till the billet reaches the required thickness; continuous hot galvanizing is conducted; rapid cooling is conducted; aerial fog is used for cooling after zinc and iron are alloyed; finishing is conducted; oiling treatment is conducted; and sampling, performance testing and subsequence procedure treatment are conducted. According to the method for producing the iron-zinc alloy coated steel plate with the yield strength being equal to or higher than 220 MPa, on the premise that the yield strength ranges from 220 MPa to 260 MPa, the tensile strength ranges from 300 MPa to 380 MPa, and the elongation is equal to or higher than 43%, grains on the surface of a zinc-iron alloy coating are fine and are even in size distribution, the area ratio of holes in the surface of the coating is equal to or smaller than 5%, no microcrack exists on the surface, and the phenomena of pulverization and falling of the coating are unlikely to occur during stamping forming, namely the 90-degree V bending test grade reaches the level 2.
Description
Technical field
The present invention relates to a kind of production method of steel plate galvanized, belong to the production method of a kind of yield strength >=220MPa galvanneal steel plate particularly.
Background technology
Zn-fe alloy coating steel plate, owing to having excellent erosion resistance, coating, weldability and anti-chad impact performance, is widely used in car panel.But, current zinc-iron alloy surface plating structure due to compactness poor, coating surface organizes thick, grain size skewness and there is obvious tiny crack on surface, when stamping, easily there is coming off and efflorescence of coating, thus cause punching parts surface quality undesirable, user's needs can not be met.
Through preliminary search: " a kind of high-strength galvannealed sheet of steels excellent in powdering resistance " of open report, it adopts following formation: at least have Fe-Zn alloy layer in the one side of former material steel plate, from the surface of described coating to coating depth direction with the thickness of more than 300, there is the region of Al (atom %)/Zn (atom %)>=0.10, and openly as required, by chemical composition composition and the tissue of specific former material steel plate, thus make processibility also preferred alloy galvanized steel plate
[1].Alloying galvanizing plate coating come off study mechanism first analyze alloying hot dip galvanized sheet coating microcosmos structure characteristic, based on coating material fragility multilayer feature, analyze the stress-strain state of coating under complex deformation condition, the failure criterion of laminate and hard brittle material strain energy density S factor failure criteria are applied to coating material, and proposition monolayer material destroys and combines with crack propagation is the major cause that coating material comes off
[9].For solving the platability proof strength simultaneously of high-strength steel, propose a kind of new dual phase steel hot dip galvanizing process herein, that is: material loading → uncoiling cleaning → two-phase region annealing → slow cooling and shrend → pickling → reheat → zinc-plated (and/or alloying) → cooling → smooth → aftertreatment and batching, wherein, adopt shrend to cool fast and first complete martensitic transformation, carry out pickling afterwards, remove surface of steel plate iron scale on the one hand, the Mn of surface enrichment can be washed away on the other hand, the alloying elements such as Si are to improve platability, and then be heated to about 460 DEG C pot galvanizes and/or alloying annealing.Due to pot galvanize after employing phase transformation, this technique changes hardening capacity problem when improving Galvanized Dual Phase Steel annealing cooling into improve martensitic stucture when dual phase steel reheats zinc-plated temper resistance problem
[12].Apply zinc-plated simulator and to inquire in zinc bath antimony (Sb) content, steel surface roughness and rate of cooling to the impact of metallic zinc Coating.Steel surface roughness is divided into relative coarseness and relative smooth two kinds, and the scope of rate of cooling is 0.1-10K/s, and in zinc bath, the scope of Sb is 0-0.1wt%.Usually, along with the increase of Sb content in zinc bath, in coating, grain-size increases gradually, and forms { 0002} crystal face on the direction being parallel to surface of steel plate.Increase steel surface roughness can reduce coating grain-size and promote to form more unordered plated crystal structure, when Sb content in zinc bath is 0.1wt%, when rate of cooling is 10K/s, steel surface roughness is not remarkable on grain-size impact.Increase rate of cooling to be conducive to reducing coating grain-size, and promote { the growth in 0002} direction
[19].The document studies zinc-plated rear speed of cooling to the impact of steel surface roughness, and its speed of cooling is maximum is only 10K/s, improves limited to coating structure compactness.Another section of document discloses " a kind of method manufacturing high strength galvanized steel plate ", and it comprises hot rolling and forms a steel plate; During continuous annealing, steel plate is heated between 750 DEG C to 900 DEG C.Average heating rate at least 10 ° of C/s between 500 DEG C to A1 transition temperature; Keep this temperature at least 10s; Be cooled to (Ms point-100 DEG C) to (Ms point-200 DEG C) with the rate of cooling of 10 ° of C/s from 750 DEG C steel plate; Steel plate recrystallization temperature is 350 DEG C to 600 DEG C; Keep this temperature 10s to 600s; Steel plate is zinc-plated.The document studies zinc-plated rear speed of cooling to the impact of steel surface roughness, and its speed of cooling is maximum is only 10K/s, improves limited to coating structure compactness.
Summary of the invention
The present invention is directed to the deficiency that prior art exists, there is provided a kind of under ensureing that it uses the prerequisite of mechanical property, zn-fe alloy coating surface microstructure is tiny, size distribution evenly, coating surface hole area occupied than≤5%, surface is non-microcracked, time stamping not easily there is the production method of the yield strength >=220MPa galvanneal steel plate of efflorescence and obscission in coating.
Realize the measure of above-mentioned purpose:
A production method for yield strength >=220MPa galvanneal steel plate, its step:
1) through desulfurizing iron, converter smelting continuous casting becomes base;
2) carry out hot rolling, and control roughing rolling temperature at 1020 ~ 1060 DEG C, control finish rolling finishing temperature at 860 ~ 890 DEG C; 3) batch, control coiling temperature at 650 ~ 700 DEG C;
4) carry out cold rolling and be rolled to desired thickness;
5) carry out continuous hot galvanizing, and control unit speed at 100 ~ 130m/min, zinc liquid temperature is at 457 ~ 463 DEG C;
6) carry out zinc-plated after quick cooling: up section adopt aerosol cooling, under speed of cooling 40 ~ 60 DEG C/s, be cooled to 470 ~ 490 DEG C;
7) after carrying out Zn-Fe alloying, adopt aerosol to cool, its speed of cooling controls at 30 ~ 50 DEG C/s;
8) carry out polishing, and polishing elongation control is 0.1 ~ 0.7%;
9) carry out painting oil treatment, control upper and lower oil surface amount each≤35g/m
2;
10) sampling, performance test and subsequent handling process.
The present invention steel plate zinc-plated go out after zinc pot, aerosol is adopted to carry out ultra-rapid cooling according to speed of cooling 40 ~ 60 DEG C/s at up section, be the zinc liquid rapid solidification that surface of steel plate is adhered to, by increasing nucleation rate, thus obtain crystal grain abundant refinement, size distribution is even, coating structure is fine and close and the initial pure zinc coating tissue of the surperficial ideal without obvious tiny crack defect.
Why on the basis of the initial pure zinc coating tissue of ideal, after alloying, adopt aerosol to cool again, and carry out ultra-rapid cooling according to speed of cooling 30 ~ 50 DEG C/s, to be to prevent the growing up at high temperature mutually of each zinc-iron alloy in alloy layer, finally to obtain that galvanneal coating surface structure is tiny, grain size distribution is even, coating structure is fine and close and the surperficial desirable zn-fe alloy coating tissue without obvious tiny crack defect.
The present invention compared with prior art, ensureing that yield strength is 220MPa ~ 260MPa, tensile strength is 300MPa ~ 380MPa, under the prerequisite of elongation >=43%, zn-fe alloy coating surface microstructure is tiny, size distribution evenly, coating surface hole area occupied than≤5%, surface is non-microcracked, time stamping not easily there is efflorescence and obscission in coating, and namely 90 ° of curved test gradings of V reach 2 grades.
Accompanying drawing explanation
Accompanying drawing is the present invention surface zn-fe alloy coating steel plate coating surface topography map.
Embodiment
Below the present invention is described in detail:
Table 1 is the main technologic parameters list of various embodiments of the present invention and comparative example;
Table 2 is the performance test results list of various embodiments of the present invention and comparative example.
Various embodiments of the present invention are all produced according to following steps:
1) through desulfurizing iron, converter smelting continuous casting becomes base;
2) carry out hot rolling, and control roughing rolling temperature at 1020 ~ 1060 DEG C, control finish rolling finishing temperature at 860 ~ 890 DEG C; 3) batch, control coiling temperature at 650 ~ 700 DEG C;
4) carry out cold rolling and be rolled to desired thickness;
5) carry out continuous hot galvanizing, and control unit speed at 100 ~ 130m/min, zinc liquid temperature is at 457 ~ 463 DEG C;
6) carry out zinc-plated after quick cooling: up section adopt aerosol cooling, under speed of cooling 40 ~ 60 DEG C/s, be cooled to 470 ~ 490 DEG C;
7) after carrying out Zn-Fe alloying, adopt aerosol to cool, its speed of cooling controls at 30 ~ 50 DEG C/s;
8) carry out polishing, and polishing elongation control is 0.1 ~ 0.7%;
9) carry out painting oil treatment, control upper and lower oil surface amount each≤35g/m
2;
10) sampling, performance test and subsequent handling process.
The main technologic parameters list of table 1 various embodiments of the present invention and comparative example
The performance test results list of table 2 various embodiments of the present invention and comparative example
As can be seen from Table 2, institute's case study on implementation excellent in mechanical performance, yield strength, tensile strength and unit elongation all meet corresponding requirements, and especially hole area occupied is less than 5% than all, and the curved efflorescence grading of corresponding V is also less than 2 grades.But although the tensile property of comparative example 1,2 all meets index request, its hole area occupied is greater than 7% than all, the curved efflorescence grading of corresponding V is also less than 3 grades.
As can be seen from Figure 1, the yield strength of this ultrafast cold explained hereafter obtains sufficient refinement at the zn-fe alloy coating High Strength Steel Plate coating surface tissue of more than 220MPa, and grain size is evenly distributed, coating structure is fine and close, hole area occupied is than≤5%, surface is without obvious tiny crack defect, and coating possesses suitable intensity and plasticity, and polishing rear surface presents obvious polishing impression.Based on this, this yield strength of producing is good at the anti-grinded hardness index of the zn-fe alloy coating High Strength Steel Plate of more than 220MPa, as shown in table 2, implement five cases, 90 ° of curved test results of V and be 2 grades, in the stamping process of corresponding part, there is not obvious efflorescence and obscission in product.
This embodiment is only the best and exemplifies, the restricted enforcement not to technical solution of the present invention.
Claims (1)
1. a production method for yield strength >=220MPa galvanneal steel plate, its step:
1) through desulfurizing iron, converter smelting continuous casting becomes base;
2) carry out hot rolling, and control roughing rolling temperature at 1020 ~ 1060 DEG C, control finish rolling finishing temperature at 860 ~ 890 DEG C; 3) batch, control coiling temperature at 650 ~ 700 DEG C;
4) carry out cold rolling and be rolled to desired thickness;
5) carry out continuous hot galvanizing, and control unit speed at 100 ~ 130m/min, zinc liquid temperature is at 457 ~ 463 DEG C;
6) carry out zinc-plated after quick cooling: up section adopt aerosol cooling, under speed of cooling 40 ~ 60 DEG C/s, be cooled to 470 ~ 490 DEG C;
7) after carrying out Zn-Fe alloying, adopt aerosol to cool, its speed of cooling controls at 30 ~ 50 DEG C/s;
8) carry out polishing, and polishing elongation control is 0.1 ~ 0.7%;
9) carry out painting oil treatment, control upper and lower oil surface amount each≤35g/m
2;
10) sampling, performance test and subsequent handling process.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109943770A (en) * | 2017-12-20 | 2019-06-28 | 宝山钢铁股份有限公司 | 780MPa rank low-carbon and low-alloy hot galvanizing TRIP steel and its quick heat treatment method |
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| CN103103538A (en) * | 2011-11-10 | 2013-05-15 | 攀钢集团研究院有限公司 | Production method of hot dipped steel coil |
| CN103882202A (en) * | 2012-12-20 | 2014-06-25 | 上海梅山钢铁股份有限公司 | Method for making high-strength hot-dip galvanized steel through continuous annealing |
| CN104342541A (en) * | 2014-11-24 | 2015-02-11 | 武汉钢铁(集团)公司 | Method for producing steel plate with extra deep drawing iron and zinc alloy plating layer |
| CN104532123A (en) * | 2015-01-06 | 2015-04-22 | 攀钢集团攀枝花钢铁研究院有限公司 | Hot-dip galvanized steel sheet and production method thereof |
| CN104975226A (en) * | 2015-07-30 | 2015-10-14 | 武汉钢铁(集团)公司 | Automotive alloying hot-dip galvanized steel with tensile strength of 440 MPa and production method |
| CN104988389A (en) * | 2015-07-30 | 2015-10-21 | 武汉钢铁(集团)公司 | Automobile alloyed hot-dip galvanized steel with tensile strength of 340 MPa grade and production method thereof |
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- 2015-11-11 CN CN201510764471.4A patent/CN105274301B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103103538A (en) * | 2011-11-10 | 2013-05-15 | 攀钢集团研究院有限公司 | Production method of hot dipped steel coil |
| CN103882202A (en) * | 2012-12-20 | 2014-06-25 | 上海梅山钢铁股份有限公司 | Method for making high-strength hot-dip galvanized steel through continuous annealing |
| CN104342541A (en) * | 2014-11-24 | 2015-02-11 | 武汉钢铁(集团)公司 | Method for producing steel plate with extra deep drawing iron and zinc alloy plating layer |
| CN104532123A (en) * | 2015-01-06 | 2015-04-22 | 攀钢集团攀枝花钢铁研究院有限公司 | Hot-dip galvanized steel sheet and production method thereof |
| CN104975226A (en) * | 2015-07-30 | 2015-10-14 | 武汉钢铁(集团)公司 | Automotive alloying hot-dip galvanized steel with tensile strength of 440 MPa and production method |
| CN104988389A (en) * | 2015-07-30 | 2015-10-21 | 武汉钢铁(集团)公司 | Automobile alloyed hot-dip galvanized steel with tensile strength of 340 MPa grade and production method thereof |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN109943770A (en) * | 2017-12-20 | 2019-06-28 | 宝山钢铁股份有限公司 | 780MPa rank low-carbon and low-alloy hot galvanizing TRIP steel and its quick heat treatment method |
| CN109943770B (en) * | 2017-12-20 | 2021-06-15 | 宝山钢铁股份有限公司 | 780 MPa-grade low-carbon low-alloy hot-dip galvanized TRIP steel and rapid heat treatment method thereof |
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