CN105331918A - Ultrahigh strength steel wire dip-coated with Zn-Al-Mg-Si alloy coating, preparation method thereof and application thereof - Google Patents
Ultrahigh strength steel wire dip-coated with Zn-Al-Mg-Si alloy coating, preparation method thereof and application thereof Download PDFInfo
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- CN105331918A CN105331918A CN201510867372.9A CN201510867372A CN105331918A CN 105331918 A CN105331918 A CN 105331918A CN 201510867372 A CN201510867372 A CN 201510867372A CN 105331918 A CN105331918 A CN 105331918A
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- hot dip
- alloy coating
- wire
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- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C2/00—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor
- C23C2/04—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor characterised by the coating material
- C23C2/06—Zinc or cadmium or alloys based thereon
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
- C21D8/06—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of rods or wires
- C21D8/065—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of rods or wires of ferrous alloys
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C18/00—Alloys based on zinc
- C22C18/04—Alloys based on zinc with aluminium as the next major constituent
-
- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C2/00—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor
- C23C2/34—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor characterised by the shape of the material to be treated
- C23C2/36—Elongated material
- C23C2/38—Wires; Tubes
Abstract
The invention relates to an ultrahigh strength coating steel wire dip-coated with a Zn-Al-Mg-Si alloy coating, a preparation method thereof and an application thereof. The alloy coating consists of the following components in percentage by mass: 30-97% of Zn, 5-80% of Al, 0.02-11% of Mg, and 0.05-5.0% of Si, based on 100% in total. The preparation method comprises the following steps: inspecting performances of an original coil rod; carrying out surface treatment; carrying out wire drawing; preparing a hot dipping Zn-Al-Mg-Si alloy coating; and carrying out stabilization treatment. The ultrahigh strength coating steel wire with the Zn-Al-Mg-Si alloy coating provided by the invention has corrosion resistance and mechanical performance superior to those of a current high-strength zinc-coated steel wire; the preparation method is easy to implement, meets needs of special environments such as a marine corrosion environment and the like on a bridge steel wire, and has a wide market prospect.
Description
Technical field
The invention belongs to steel wire and preparation field thereof, particularly a kind of superstrength hot dip galvanizing-Al-Mg-Si alloy coating wire and its preparation method and application.
Background technology
Along with the develop rapidly of bridge construction technology, bridge construction design is constantly increasing across footpath, and the main bearing carrier " main push-towing rope " as suspension bridge also correspondingly experienced by and proceeded to employing high-strength galvanized steel wire from initial use iron chains.Along with the increase of Suspension Bridges, propose requirements at the higher level, to control the deadweight of bridge main push-towing rope and the construction cost of ultra-large type bridge to the intensity of the galvanized steel wire being used as main push-towing rope is also corresponding.While the mechanical property that maintenance is outstanding, be adapt to marine corrosion sex climate, the solidity to corrosion of bridge steel wire is had higher requirement, and the requirement that traditional hot-dip galvanizing steel wire has been difficult to adaptation present stage specific environment and will have built future.
Microalloying applies a kind of wire rod enhancement method widely, mainly utilizes precipitation strength and the solution strengthening of microalloy element, reaches refine pearlite laminated structure, improves the object of intensity and plasticity.Meanwhile, adding of element-specific, effectively can improve the solidity to corrosion of material, and then adapt to the needs of Special field environment.Microalloy element conventional in high carbon steel has V, Al, Cr, Si, Ti etc.During precipitation strength, the carbon nitrogen of alloying element in steel is combined, and forms nano level carbonitride, plays the effect of pinning crystal boundary, fining austenite grains; During solution strengthening, alloying element incorporates in ferrite or cementite, causes lattice distortion, increases the resistance of dislocation motion, makes slippage be difficult to carry out, thus improves steel strength.
Improving original wire rod intensity is the optimal path obtaining superstrength underrelaxation bridge steel wire, and having outstanding corrosion proof alloy layer is then improve the corrosion proof good method of bridge steel wire.For improving wire rod intensity, strictly drawing process must be designed in production process, in this operation, first to intensity needed for the finished product and toughness reguirements propose raw material specification and mechanical property requirements, determine total draught, be secondly that properly distributed is carried out to each passage Partial shrinkage rate, then determine suitable drawing speed according to status of equipment, the drawing process of the high strength low relaxed galvanized steel wire of Φ 7.0mm1770MPa can not be indiscriminately imitated, prevent the loss of product strength and toughness.
Zinc coating is the coating that current bridge steel wire is conventional, although have certain solidity to corrosion, causes solidity to corrosion to reduce because its porosity is higher.
Summary of the invention
Technical problem to be solved by this invention is to provide a kind of superstrength hot dip galvanizing-Al-Mg-Si alloy coating wire and its preparation method and application, and this alloy layer steel bar has the excellent feature of superstrength, underrelaxation rate, antiseptic property.
A kind of superstrength hot dip galvanizing-Al-Mg-Si alloy coating wire of the present invention, described Zn-Al-Mg-Si alloy layer consists of by mass percentage: Zn30-97%, Al5-80%, Mg0.02-11%, Si0.01-5.0%; Wherein, mass percent sum is absolutely.
Quality in described alloy layer unit surface is 130-400g/m
2.
Quality in described alloy layer unit surface is 220g/m
2.
The corrosion potential E of described alloy layer
coorfor-1.05 ~-1.10V, I
coorbe 3 ~ 8 × 10
-6acm
-2.
The polarization resistance of described alloy layer is 5000 ~ 8000 Ω cm
2.
The preparation method of a kind of superstrength hot dip galvanizing-Al-Mg-Si alloy coating wire of the present invention, comprising:
(1) can check original wire rod Progressive symmetric erythrokeratodermia;
The special wire rod of φ 13.5mm, B82MnQL bridge cable selecting species abundance in Baosteel in Shanghai to develop, ensures that its composition, mechanical property etc. meet the requirements.As tensile strength 1210 ± 50MPa, section shrinkage >=30%; Wire rod must not have quenching structure, cementite network and the tissue to detrimental, and sorbite percentage should be greater than 90%; Undertaken by GB/T224-1987 requirement, total decarburized layer (full decarburization+transition layer) should be not more than 0.07mm; Carry out the detection of grain fineness number by YB/T5148 standard, the acceptability limit that grain fineness number detects is 7-9 level;
(2) surface treatment is carried out to the wire rod be up to the standards in step (1);
(3) after surface treatment, adopt wire drawing total draught to be greater than 85%, the distribution of each passage Partial shrinkage rate adopts " low after front height " method to carry out wire drawing; In drawing process, start just to give larger Partial shrinkage rate in distortion, along with the increase of deform metallic material and hardenability, Partial shrinkage Shuai Zhu road reduces, guarantee the over-all properties of material under super large rate of compression, ensure that the steel wire through drawing and follow-up stabilization treatment has superstrength, underrelaxation and higher toughness and plasticity.
According to product strength requirement, primary election raw material specification of the present invention is 13.5mm, strength range 1210 ± 50MPa, and wire drawing trimmed size is 5.0mm series.
(4), after wire drawing, hot dip galvanizing-Al-Mg-Si alloy coating is carried out; Wherein, alloy layer consists of by mass percentage: Zn30-97%, Al5-80%, Mg0.02-11%, Si0.01-5.0%; Wherein, mass percent sum is absolutely; The temperature of hot dip process is 470 DEG C ~ 720 DEG C; Time is 30s ~ 60s.
(5) carry out stabilization treatment, obtain superstrength hot dip galvanizing-Al-Mg-Si alloy coating wire; Wherein, stabilization treatment adopts the tight mode of double sheet to produce, and parameter comprises treatment temp: 360 DEG C-420 DEG C, process tension force: 25%-45% nominal breaking force.
In described step (2), surface treatment flow process comprises: wire rod → pickling → cleaning → phosphatization → hot water cleaning → borax treatment → oven dry → discharging.
Described cleaning comprises rinsing and flushing.
Described surface treatment is except descaling, oil, water, dust and other any impurity.
In described step (4), the temperature of hot dip process is 560 DEG C, and the time is 60s.
In described step (5), treatment temp is 400 DEG C, and process tension force is 45% nominal breaking force.
Described steel wire is applied as the bridge steel wire under marine corrosion atmosphere.
In order to meet the needs of physical strength, redesigning the drawing process of steel wire, and reasonable adjusting and control are carried out to the composition of alloy for hot-dip coating.After hot dip process, design one stabilizing treatment technique to improve the impact of hot dip process on intensity of steel wire and toughness simultaneously.
(improve the composition of alloy for hot-dip, in traditional galvanizing system, incorporate Al, Mg, Si element by the hot dip process treatment process improved, strict composition and the ratio controlling molten bath alloy.Simultaneously according to the composition of coating alloy, finely tune hot dip process temperature, hot dip process temperature is 470 DEG C ~ 720 DEG C, and preferable temperature is 560 DEG C, and time controling is at 30s ~ 60s, and the preferred time is 60s.); even, fine and close Zn-Al-Mg-Si alloy layer is obtained in Steel Wire Surface; rich Al-Mg alloy phase, rich Zn-Al-Si alloy phase and few Zn-Al-Mg-Si alloy phase is there is in the weave construction of its coating; rich Al-Mg alloy phase and rich Zn-Al-Si alloy phase alternately exist; work in coordination with and played the sacrificing protection effect of Zn-Al-Si alloy phase and the passivation protection effect of Al-Mg alloy phase; Al-Mg alloy phase in coating forms netted hard framework, can play the effect stoping Zn-Al-Si alloy corrosion.Due to adding of Mg, the Al-Mg hydroxide film that Mg and Al is formed is except the effect playing passive film, also the corrosion product accordingly with self sealing capability is generated after corrosion, the defect in coating is blocked together with the corrosion product of Zn, form finer and close corrosion scales, strengthen the self-enclosed effect of coating, coating is improved greatly in the corrosion resisting property in corrosion later stage.
85% is greater than at wire drawing total draught, Partial shrinkage rate carries out wire drawing under adopting the processing condition of " low after front height " apportioning method, take full advantage of deform metallic material incipient plastic good, the feature that deformability is larger, start just to give larger Partial shrinkage rate in distortion, later along with the increase of deform metallic material and hardenability, Partial shrinkage Shuai Zhu road reduces, thus the over-all properties of material under ensure that super large rate of compression situation, and to wire rod by the basis of road tube reducing wire drawing and hardening treatment, after the stabilization process process of " double sheet is tight " and " limited diameter mould ", produce and there is superstrength simultaneously, the extra-high strength wire of underrelaxation and higher toughness and plasticity, effectively to overcome in prior art and existing can not produce the drawback simultaneously taking into account superstrength and high twisting property galvanized steel wire, as long as select smelting component and mechanical property to meet the starting material of pre-provisioning request, high rear low apportioning method before under super large total draught is adopted in drawing process, just can produce and meet super-strength comprehensively, the superstrength bridge steel wire of high torsion ductility technical requirement.
The present invention, by the elementary composition and drawing parameter of conservative control wire rod, meets suspension bridge and develops needs to bridge steel wire superstrength and underrelaxation.The Zn-Al-Mg-Si alloy layer prepared in Steel Wire Surface by hot dip process process is smooth, homogeneous and porosity is lower, and relative to zinc coating, solidity to corrosion is stronger, can adapt to more harsh climate environment.The stabilizing treatment technique simultaneously designed after hot dip process, effectively can overcome the impact of hot dip process operation on former intensity of steel wire and toughness, maintain the superstrength of steel wire, underrelaxation characteristic.Superstrength bridge steel wire with Zn-Al-Mg-Si alloy layer provided by the invention, its solidity to corrosion and mechanical property are better than current high-strength galvanized steel wire, easy to implement, meet particular surroundings, as under marine corrosion atmosphere to the needs of bridge steel wire, there are wide market outlook.
The present invention adopts hot dip galvanizing-Al-Mg-Si alloy coating to substitute original zinc layers, while guarantee superstrength, underrelaxation and height are torsion, improves the solidity to corrosion of steel wire further.
beneficial effect
(1) superstrength hot dip galvanizing-Al-Mg-Si alloy coating wire of the present invention is while guarantee superstrength, underrelaxation and height are torsion, improves the solidity to corrosion of steel wire further;
(2) the present invention is easy to implement, meets particular surroundings, as under marine corrosion atmosphere to the needs of bridge steel wire, there are wide market outlook.
Accompanying drawing explanation
Fig. 1 is the SEM figure of embodiment 1 interalloy coating.
Embodiment
Below in conjunction with specific embodiment, set forth the present invention further.Should be understood that these embodiments are only not used in for illustration of the present invention to limit the scope of the invention.In addition should be understood that those skilled in the art can make various changes or modifications the present invention, and these equivalent form of values fall within the application's appended claims limited range equally after the content of having read the present invention's instruction.
Embodiment 1
Manufacture of the present invention
the technical process of 1860MPa superstrength hot dip galvanizing-Al-Mg-Si coating steel wire product is as follows: original wire rod service check → surface treatment → wire drawing → hot dip process → stabilization treatment → inspection.
1. original wire rod service check
Species abundance in Baosteel in Shanghai is selected to develop
the special wire rod of B82MnQL bridge cable, ensures that its composition, mechanical property etc. meet the requirements.Tensile strength 1210 ± 50MPa, section shrinkage >=30%; Wire rod must not have quenching structure, cementite network and the tissue to detrimental, and sorbite percentage should be greater than 90%; Undertaken by GB/T224-1987 requirement, total decarburized layer (full decarburization+transition layer) should be not more than 0.07mm; Carry out the detection of grain fineness number by YB/T5148 standard, the acceptability limit that grain fineness number detects is 7-9 level.
2. surface treatment
To wire rod surface treatment before hot dip process, except descaling, oil, water, dust and other any impurity.
Surface preparatory process technical process: wire rod → pickling → cleaning (rinsing, flushing) → phosphatization → hot water cleaning → borax treatment → oven dry → discharging.
3. wire drawing
According to product strength requirement, primary election raw material specification of the present invention is 13.5mm, strength range 1210 ± 50MPa, and wire drawing trimmed size is 5.0mm series.Adopt wire drawing total draught to be 86.12%, the distribution of each passage Partial shrinkage rate adopts " low after front height " method.
4. hot dip galvanizing-Al-Mg-Si coating
In wire rod surface treatment, Zn-Al-Mg-Si coating can significantly improve the solidity to corrosion of steel wire, to meet the need of production under particular surroundings.Hot dip process operation is the critical process of bridge Production for Steel Wire, the strict quality control of hot dip process operation is related to the quality of product corrosion resisting property.Meanwhile, also hot dip process should be controlled within the specific limits the impact of product strength, toughness.
Basic demand to hot dip galvanizing-Al-Mg-Si alloy coating procedure:
(1) alloy layer has good surface topography, homogeneous continuously, imporosity and crackle, and as shown in Figure 1, figure is the lower alloy layer surface topography of SEM observation, and magnification is 500 times.Zn-Al-Mg-Si is born of the same parents' shape pattern, and surface compact is homogeneous, the defect such as imporosity, crackle.
(2) mass percent of Zn-Al-Mg-Si multicomponent alloy layer consists of: Zn30-97%, Al5-80%, Mg0.02-11%, Si0.01-5.0%, and summation meets 100%, and each constituent content of alloy layer needs to control within the limits prescribed.
(3) alloy layer performance test: sticking power 14.8Mpa, porosity 1.6%, there is not red rust in more than 9000 hours in salt-fog test.(inside step 2, the content of each component is scope, and test result also should be scope; Or each component concentration of component changes occurrence into) wherein, the temperature of hot dip process is 560 DEG C, and the time is 60s.
5. stabilization treatment
The object of stabilization treatment is to reduce the impact of immersion on former wire rod intensity and toughness.The ultimate principle of stabilization treatment is " applying tension force to steel wire while, carrying out low-temperaturetempering process to steel wire ".The tight mode of double sheet that stabilization treatment of the present invention adopts is produced, its main technologic parameters:
Treatment temp: 400 DEG C
Process tension force: 45% nominal breaking force.
" double sheet is tight " mode equipment relative complex, but, plasticity tough on product does not affect.
6. alloy layer corrosion resisting property test
Alloy element component is: Zn92%, Al4.3%, Mg0.07%, Si3.63%.
Sticking power is tested: 16MPa
Porosity is tested: 1.5%
Initial polarization resistance: 2564 Ω .cm
2, after 32 days salt water immersion test, polarization resistance is 11320.3 Ω cm
2.
Corrosion potential (E
corr)-1.15V, excellent galvanic protection performance can be played to magnesium iron base material, corrosion current (I
corr) 1.0 × 10-5A.cm
-2, corrosion speed is slow, has good solidity to corrosion.
Resistance to red rust time (neutral salt spray test) > 9000 hours.
Embodiment 2
The hot dip galvanizing produced according to present invention process-Al-Mg-Si alloy coating wire, control alloying constituent is Zn92%, Al4.3%, Mg0.07%, Si3.63%, after testing, tensile strength >=1860MPa, yield strength >=1520MPa, relaxation rate≤7.5%, reverses (L=100d) >=8.Steel wire shows outstanding intensity, underrelaxation rate and high twisting property, meets the requirement of suspension bridge development to novel bridge steel wire mechanical property.
By the elementary composition of conservative control wire rod and drawing parameter, meet the needs of suspension bridge development to bridge steel wire superstrength and underrelaxation.
Claims (10)
1. superstrength hot dip galvanizing-Al-Mg-Si alloy coating wire, is characterized in that, described Zn-Al-Mg-Si alloy layer consists of by mass percentage: Zn30-97%, Al5-80%, Mg0.02-11%, Si0.01-5.0%; Wherein, mass percent sum is absolutely.
2. a kind of superstrength hot dip galvanizing-Al-Mg-Si alloy coating wire according to claim 1, it is characterized in that, the quality in described alloy layer unit surface is 130-400g/m
2.
3. the strong fast hot dip galvanizing-Al-Mg-Si alloy coating wire of a kind of superelevation according to claim 1, is characterized in that, the corrosion potential E of described alloy layer
coorfor-1.05 ~-1.10V, I
coorbe 3 ~ 8 × 10
-6acm
-2.
4. the strong fast hot dip galvanizing-Al-Mg-Si alloy coating wire of a kind of superelevation according to claim 1, is characterized in that, the polarization resistance of described alloy layer is 5000 ~ 8000 Ω cm
2.
5. a preparation method for superstrength hot dip galvanizing-Al-Mg-Si alloy coating wire, comprising:
(1) can check original wire rod Progressive symmetric erythrokeratodermia;
(2) surface treatment is carried out to the wire rod be up to the standards in step (1);
(3) after surface treatment, carry out wire drawing, wire drawing total draught is greater than 85%;
(4), after wire drawing, hot dip galvanizing-Al-Mg-Si alloy coating is carried out; Wherein, alloy layer consists of by mass percentage: Zn30-97%, Al5-80%, Mg0.02-11%, Si0.01-5.0%, and mass percent sum is absolutely; Wherein, the temperature of hot dip process is 470 DEG C ~ 720 DEG C, and the time is 30s ~ 60s;
(5) carry out stabilization treatment, obtain superstrength hot dip galvanizing-Al-Mg-Si alloy coating wire; Wherein, stabilization treatment adopts the tight mode of double sheet to produce, and parameter comprises treatment temp: 360 DEG C-420 DEG C, process tension force: 25%-45% nominal breaking force.
6. the preparation method of a kind of superstrength hot dip galvanizing-Al-Mg-Si alloy coating wire according to claim 5, is characterized in that, in described step (2), surface treatment flow process comprises: wire rod, pickling, cleaning, phosphatization, hot water cleans, borax treatment, dries, discharging.
7. the preparation method of a kind of superstrength hot dip galvanizing-Al-Mg-Si alloy coating wire according to claim 6, it is characterized in that, described cleaning comprises rinsing and flushing.
8. the preparation method of a kind of superstrength hot dip galvanizing-Al-Mg-Si alloy coating wire according to claim 5, is characterized in that, in described step (4), the temperature of hot dip process is 560 DEG C, and the time is 60s.
9. the preparation method of a kind of superstrength hot dip galvanizing-Al-Mg-Si alloy coating wire according to claim 5, is characterized in that, in described step (5), treatment temp is 400 DEG C, and process tension force is 45% nominal breaking force.
10. an application for superstrength hot dip galvanizing-Al-Mg-Si alloy coating wire as claimed in claim 1, is characterized in that, described steel wire is applied to ocean bridge steel wire.
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|---|---|---|---|
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| CN106180221A (en) * | 2016-07-19 | 2016-12-07 | 奥盛（九江）新材料有限公司 | Mould method is joined in a kind of high-strength prestressed steel wire drawing |
| CN106521385A (en) * | 2016-11-22 | 2017-03-22 | 常州大学 | Two-step SuperDyma alloy hot dipping technology for structural steel |
| CN108588625A (en) * | 2018-07-31 | 2018-09-28 | 中研智能装备有限公司 | A kind of steel construction ZnAlMgSiB corrosion-inhibiting coatings and preparation method thereof |
| CN108893698A (en) * | 2018-07-31 | 2018-11-27 | 中研智能装备有限公司 | Steel construction ZnAlMgTiSiB corrosion-inhibiting coating and preparation method thereof |
| CN111328350A (en) * | 2017-12-28 | 2020-06-23 | 日本制铁株式会社 | Hot-dip Zn-coated steel sheet excellent in corrosion resistance after coating |
| CN113474574A (en) * | 2019-02-26 | 2021-10-01 | 贝卡尔特公司 | Helical compression spring for an actuator for opening and closing a door or tailgate of a motor vehicle |
| CN113474575A (en) * | 2019-02-26 | 2021-10-01 | 贝卡尔特公司 | Actuator for opening and closing a door or tailgate of a motor vehicle |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN106180221A (en) * | 2016-07-19 | 2016-12-07 | 奥盛（九江）新材料有限公司 | Mould method is joined in a kind of high-strength prestressed steel wire drawing |
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| CN106521385A (en) * | 2016-11-22 | 2017-03-22 | 常州大学 | Two-step SuperDyma alloy hot dipping technology for structural steel |
| CN111328350A (en) * | 2017-12-28 | 2020-06-23 | 日本制铁株式会社 | Hot-dip Zn-coated steel sheet excellent in corrosion resistance after coating |
| CN111328350B (en) * | 2017-12-28 | 2022-04-26 | 日本制铁株式会社 | Hot-dip Zn-coated steel sheet excellent in corrosion resistance after coating |
| CN108588625A (en) * | 2018-07-31 | 2018-09-28 | 中研智能装备有限公司 | A kind of steel construction ZnAlMgSiB corrosion-inhibiting coatings and preparation method thereof |
| CN108893698A (en) * | 2018-07-31 | 2018-11-27 | 中研智能装备有限公司 | Steel construction ZnAlMgTiSiB corrosion-inhibiting coating and preparation method thereof |
| CN113474574A (en) * | 2019-02-26 | 2021-10-01 | 贝卡尔特公司 | Helical compression spring for an actuator for opening and closing a door or tailgate of a motor vehicle |
| CN113474575A (en) * | 2019-02-26 | 2021-10-01 | 贝卡尔特公司 | Actuator for opening and closing a door or tailgate of a motor vehicle |
| CN113474574B (en) * | 2019-02-26 | 2024-04-09 | 贝卡尔特公司 | Helical compression spring for an actuator for opening and closing a door or tailgate of a motor vehicle |
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