CN109797341A - A kind of yield strength is not less than 345MPa Weather-resistance bridge steel and preparation method thereof - Google Patents

A kind of yield strength is not less than 345MPa Weather-resistance bridge steel and preparation method thereof Download PDF

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CN109797341A
CN109797341A CN201811260863.7A CN201811260863A CN109797341A CN 109797341 A CN109797341 A CN 109797341A CN 201811260863 A CN201811260863 A CN 201811260863A CN 109797341 A CN109797341 A CN 109797341A
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weather
cooling
less
345mpa
temperature
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李灿明
胡淑娥
侯东华
成小龙
王国强
韩启彪
孙京波
杨建勋
胡晓英
孔雅
刘熙章
李博
王军
代平
王振华
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SD Steel Rizhao Co Ltd
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SD Steel Rizhao Co Ltd
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Abstract

The present invention relates to a kind of yield strengths not less than 345MPa Weather-resistance bridge steel and preparation method thereof, its ingredient and weight percent are C:0.07~0.11%, Si:0.15%~0.30%, Mn:0.80~1.20%, P≤0.015%, S≤0.005%, Al:0.01~0.04%, Cr:0.20~0.40%, Cu:0.20~0.40%, Ni:0.20~0.50%, Nb:0.020~0.050%, Ti:0.010~0.040%, remaining is Fe and inevitable impurity, it is prepared: being smelted using following process, slow cooling, heating, rolling, it is cooling, stacking is cooling.The present invention is using inexpensive microalloying design, it is with short production cycle, at low cost, conducive to popularization and application, with excellent welding performance, obdurability and the matching of strong plasticity, low yield strength ratio, corrosion resistance, weatherability, weldability and anti-fatigue performance, relatively traditional weathering steel, weather resistance are enhanced about more than once, and may replace traditional high-strength weathering steel, it can exempt from coating applied to fields such as bridge and outdoor tower frames, to reduce use and maintenance cost.

Description

A kind of yield strength is not less than 345MPa Weather-resistance bridge steel and preparation method thereof
Technical field
The present invention relates to iron and steel smelting technology fields, and in particular to a kind of yield strength is not less than 345MPa Weather-resistance bridge Steel and preparation method thereof.
Background technique
Bridge is chronically exposed in air, is subjected to corroding and being lost for a long time, the expense spent in terms of anti-corrosion accounts for steel bridge The very big specific gravity of late maintenance cost;Weathering steel has excellent corrosion resistance, can not have to coating under certain condition, significantly Reduce the operation and maintenance cost of steel construction, there is significant economical and environmentally friendly effect.Therefore, weathering steel is compared to ordinary steel There is significant advantage in the application of the large-scale steel structures engineering such as bridge, building structure.
1962917 A of CN discloses a kind of weather-proof atmosphere corrosion steel of Extra High Strength, and Mn, Cr, Ni, Nb, Mo content are high, High production cost, and product is the hot rolled coil of 2~12mm.
102534417 A of CN discloses a kind of high-performance bridge weathering steel and preparation method thereof containing Mo, chemical composition By weight percentage are as follows: C:0.02~0.05%, Mn:1.00~1.50%, Cr:0.40~0.60%, Mo:0.10~ 0.30%, it is produced using Ultra-low carbon, high alloy content, high production cost.
102766808 A of CN discloses a kind of microalloying bridge steel plate and its normalizing rolling technique, carbon content 0.15 ~0.25%, carbon content height significantly reduces the welding performance and Corrosion Protection of steel.
103290331 A of CN disclose a kind of yield strength 450MPa high-intensitive high-corrosion resistance steel board and its Production method, C:0.002~0.005%, Cr:2.80~4.00% are produced using Ultra-low carbon and high alloy ingredient, are produced into This height.
Summary of the invention
To overcome the deficiency, the purpose of the present invention is to provide a kind of yield strengths to be not less than 345MPa Weather-resistance bridge Steel and preparation method thereof meets the requirement of intensity, toughness, also to there is weatherability, while also to guarantee that lower yield tensile ratio, carbon are worked as Amount and welding sensitivity coefficient.
The technical solution adopted by the present invention to solve the technical problems is: a kind of yield strength is not less than the weather-proof bridge of 345MPa Joist steel, ingredient and weight percent are C:0.07~0.11%, Si:0.15%~0.30%, Mn:0.80~1.20%, P ≤ 0.015%, S≤0.005%, Al:0.01~0.04%, Cr:0.20~0.40%, Cu:0.20~0.40%, Ni:0.20 ~0.50%, Nb:0.020~0.050%, Ti:0.010~0.040%, remaining is Fe and inevitable impurity.
One of an important factor for chemical component is influence product comprehensive performance, limits chemical component of the invention System, is described as follows:
C: main solution strengthening element in steel can significantly improve armor plate strength, but higher carbon content welds steel plate Connect, toughness and plasticity it is unfavorable.To effectively reduce segregation, microstructure uniformity is improved, the potential difference between out-phase is avoided to cause Galvanic corrosion, improves the corrosion resisting property of steel, while considering economy;Therefore limit its mass percentage content as 0.07~ 0.11%;
Si: silicon is one of the effective deoxidation of steelmaking process and heat release element, there is certain solution strengthening effect, is conducive to cause The formation of close rusty scale can improve the atmospheric corrosion resistance of steel, but the excessively high surface quality that can reduce steel of silicone content, welding performance And low-temperature flexibility, silicone content control of the present invention is 0.15%~0.30%;
Mn: manganese has stronger solution strengthening effect, can significantly reduce the phase transition temperature of steel, refines the microscopic structure of steel, And it is low in cost, it is the effective element for improving intensity, in order to realize sufficiently high tensile strength, obtains low yield strength ratio, content Not lower than 0.80%;But too high levels be easy to cause slab to be segregated, and will form banded structure, reduce the solderability and weldering of steel plate Connect heat affected area toughness and corrosion resistance;Manganese content control of the present invention is 0.80~1.20%;
P: phosphorus can improve the weatherability of steel, increase the cold brittleness of steel, deteriorate welding performance;Thus the present invention does not use height to contain The phosphorus of amount increases weatherability, but reaches high corrosion resistance by the reasonable combination of other alloying elements;The present invention Phosphorus content is controlled≤0.015%;
S: it is hot-short that sulphur generates steel, reduces the ductility and toughness of steel, also promotes the anisotropy of steel plate, and sulfide It is mingled with the corrosion resistance for also significantly reducing steel, answers the sulfur content in strict control steel;Sulfur content of the present invention control≤ 0.005%;
Al: aluminium is one of effective deoxidant element of steelmaking process, can effectively reduce inclusion content of steel, refines crystal grain, But too high levels are easy to crack casting billet surface, and aluminium content control of the present invention is 0.01~0.04%;
Cr: chromium is not only to improve the element of steel hardenability, or improves one of the effective element of steel weatherability, and the present invention is not The weatherability of steel is improved using the phosphorus of high-content, therefore chromium content cannot be too low, lower limit control is 0.20%, another party 0.40% is limited in face, the excessively high toughness that will affect steel of chromium content, and weldability can also be deteriorated, thus content;
Cu: copper is one of the effective element for improving steel weatherability, its electrochemical potentials can make surface of steel plate than high Iron rust densification, promote the formation for stablizing rusty scale, but steel billet will be caused to generate in heating or course of hot rolling when too high levels Crackle, deteriorates surface of steel plate performance, and copper should be controlled 0.20~0.40%;
Ni: nickel can improve steel plate weatherability, can prevent copper brittleness phenomenon from occurring, and reduce casting, hot rolling and welding process Fire check sensibility, in addition, nickel is also the steel plate acquisition indispensable alloying element of superior low-temperature toughness, but it is at high cost;It is comprehensive It closes and considers, nickel should be controlled 0.20~0.50%;
Nb: niobium is one of important element of refined crystalline strengthening, improve austenite recrystallization temperature, prevent austenite recrystallization and Crystal grain is inhibited to grow up, fining austenite grains;Its carbonitride is precipitated and austenite grain boundary segregation in dislocation, improve intensity and Toughness;But content of niobium is excessively high, and slab is easy to produce face crack, while deteriorating welding performance, and content of niobium control of the present invention exists 0.02~0.05%;
Ti: strong precipitation strength and moderate Grain Refinement Effect are generated, micro titanium is added in steel, it is therefore an objective to In conjunction with nitrogen in steel, the very high titanium nitride particle of stability is generated, inhibit welded thin-wall box component area Austenite Grain Growth and is changed secondary Phase-change product improves the low-temperature flexibility of Large Heat Input Welding.The Ti content added in steel will be matched with the nitrogen content in steel, when adding It is very few to enter Ti content, forms titanium nitride number of particles deficiency, be not enough to inhibit the Austenite Grain Growth of HAZ and changes secondary phase Sell of one's property object and improve the low-temperature flexibility of Large Heat Input Welding HAZ, be added Ti content it is excessive when, be precipitated during solidification of molten steel big The titanium nitride particle of size, this large scale particle cannot not only inhibit the Austenite Grain Growth of HAZ, sprout instead as crackle Raw starting point;Ti content control of the present invention is 0.010~0.040%.
A kind of above-mentioned yield strength is not less than the preparation method of 345MPa Weather-resistance bridge steel, including following process:
One, it smelts: being smelted using Linz-Donawitz process, top and bottom complex blowing, abundant decarburization, dephosphorization;Then pass through LF Refining, RH application of vacuum reduce harmful element/impurity content, carry out microalloying;Then continuous casting is carried out, whole process protection is cast, End cast using weight Reduction Technology, depresses ratio 8~10%, obtains slab;
Two, slow cooling: after slab is cut, it is put into burial pit, slow cooling time is no less than 48 hours;
Three, heat: through recuperative heater, slab temperature of tapping is 1150~1180 DEG C, in heating process, using three sections Heating process, first segment: preheating section temperature sets 700~850 DEG C;Second segment: it is divided into 2-2 sections of 2-1 sections of heating and heating, heating 2-1 sections of temperature set 1050~1200 DEG C, in 1050~1100 DEG C of sections using quickly heating, heat 2-2 sections of temperature settings 1180~1230 DEG C;Third section: soaking zone furnace gas temperature is set as 1150~1200 DEG C;
Four, it rolls: being rolled using the two-stage, the heavy reduction rate of at least continuous 15% or more three passage is taken in roughing, then Into finish rolling, as finished product thickness≤14mm, finish rolling finishing temperature is controlled at 830~880 DEG C, as finished product thickness G T.GT.GT 14mm, Finish rolling finishing temperature is controlled at 690~720 DEG C;
Five, cooling: steel plate roller repairing, 4~8 DEG C/s of cooling rate, 630~660 DEG C of final cooling temperature.
Six, stacking is cooling: carrying out stacking slow cooling after steel plate is cooling, slow cooling time is no less than 8 hours.
The invention has the following advantages: the present invention is using inexpensive microalloying design, the low-carbon+micro in The alloying elements such as Cu, Cr, Ni are produced by TMCP technique, improve weatherability and comprehensive mechanical property, reduce noble element use Amount, it is with short production cycle, at low cost, it is conducive to promote and apply;Ingredient design is simple, and Microstructure Uniformity is good, microcell electrode potential Difference is small, splendid obdurability matching, excellent low-temperature flexibility, and -40 DEG C of low-temperature impact works of 60mm thick steel plate are greater than 200J;Steel plate tool There are excellent welding performance, obdurability and the matching of strong plasticity, low yield strength ratio, corrosion resistance, weatherability, weldability and fatigue resistance Can, relatively traditional weathering steel, weather resistance is enhanced about more than once, and may replace traditional high-strength weathering steel, can exempt from coating applied to bridge The fields such as beam and outdoor tower frame, to reduce use and maintenance cost.
Detailed description of the invention
Fig. 1 is preparation method flow chart of the present invention
Specific embodiment
Specific embodiments of the present invention will be described in further detail below, but embodiments of the present invention are not limited to This.
Embodiment 1
A kind of yield strength is not less than 345MPa Weather-resistance bridge steel, the 60mm Weather-resistance bridge steel prepared in the present embodiment Chemical component is as follows: C:0.08%, Si:0.23%, Mn:1.0%, P:0.012%, S:0.003%, Al:0.03%, Cr: 0.30%, Cu:0.32%, Ni:0.30%, Nb:0.03%, Ti:0.018%, remaining is Fe and inevitable impurity.
Preparation method is seen below:
One, it smelts: being smelted using Linz-Donawitz process, top and bottom complex blowing, abundant decarburization, dephosphorization;Then pass through LF Refining, RH application of vacuum reduce harmful element/impurity content, carry out microalloying;Then continuous casting is carried out, whole process protection is cast, Casting end, weight base are depressed ratio 10%, are obtained slab using weight Reduction Technology;
Two, slow cooling: after slab is cut, being put into burial pit, and slow cooling time 48 hours, until 300 DEG C hereinafter, slab thickness For 270mm;
Three, heat: through recuperative heater, slab temperature of tapping is 1170 DEG C;
Four, it rolls: being rolled using the two-stage, slab is come out of the stove through descaling mill, 1105 DEG C of beginning roughing, continuous three passages pressure Rate is greater than 15%, subsequently into finish rolling, 790 DEG C of finish rolling start rolling temperature, and 705 DEG C of finishing temperature, finished product thickness 60mm;
Five, cooling: steel plate rolls rear water cooling, 5 DEG C/s of cooling rate, and 650 DEG C of final cooling temperature;
Six, stacking is cooling: carrying out stacking slow cooling after steel plate is cooling, slow cooling time is no less than 8 hours, comprehensive performance such as table 1 Shown in~2.
Specifically, in the step 3, using three sections of heating process, first segment: preheating section temperature sets 700~850 DEG C; Second segment: being divided into 2-2 sections of 2-1 sections of heating and heating, heats 2-1 sections of temperature and sets 1050~1200 DEG C, at 1050~1100 DEG C It heats 2-2 sections of temperature using quickly heating and sets 1180~1230 DEG C in section;Third section: soaking zone furnace gas temperature is set as 1150~1200 DEG C.
Embodiment 2
A kind of yield strength is not less than 345MPa Weather-resistance bridge steel, the 10mm Weather-resistance bridge steel prepared in the present embodiment Chemical component is as follows: C:0.09%, Si:0.22%, Mn:0.9%, P:0.011%, S:0.003%, Al:0.028%, Cr: 0.25%, Cu:0.30%, Ni:0.28%, Nb:0.04%, Ti:0.019%, remaining is Fe and inevitable impurity.
Preparation method is seen below:
One, it smelts: being smelted using Linz-Donawitz process, top and bottom complex blowing, abundant decarburization, dephosphorization;Then pass through LF Refining, RH application of vacuum reduce harmful element/impurity content, carry out microalloying;Then continuous casting is carried out, whole process protection is cast, Casting end, weight base are depressed ratio 9%, are obtained slab using weight Reduction Technology;
Two, slow cooling: after slab is cut, being put into burial pit, and slow cooling time 48 hours, until 300 DEG C hereinafter, slab thickness For 182mm;
Three, heat: through recuperative heater, slab temperature of tapping is 1170 DEG C;
Four, it rolls: being rolled using the two-stage, slab is come out of the stove through descaling mill, 1120 DEG C of beginning roughing, continuous three passages pressure Rate is greater than 15%, subsequently into finish rolling, 980 DEG C of finish rolling start rolling temperature, and 845 DEG C of finishing temperature, finished product thickness 10mm;
Five, cooling: steel plate rolls rear air-cooled;
Six, stacking is cooling: carrying out stacking slow cooling after steel plate is cooling, 680 DEG C of stacking slow cooling start temperature, slow cooling time is many In 8 hours, comprehensive performance was as shown in table 1~2.
The tensile property of 1 steel plate of the embodiment of the present invention of table
Embodiment Thickness/mm Yield strength/MPa Tensile strength/MPa Elongation after fracture/% Yield tensile ratio
Embodiment 1 60 370 560 27.5 0.66
Embodiment 2 10 390 545 28.0 0.72
The low-temperature flexibility of 2 steel plate of the embodiment of the present invention of table
Other test measurements
1, electrochemical corrosion potential measures:
Electro-chemical test uses three-electrode system: working electrode is area respectively for the bare board electrode and warp of 10 × 10mm2 The band rust electrode prepared after 30 alternation of wetting and drying period corrosion, reference electrode is saturated calomel electrode (SCE), and auxiliary electrode is face Product is the platinized platinum of 9cm2, is connected between working electrode and reference electrode using salt bridge.Operating temperature is 25 DEG C of room temperature, all electricity Place value is the current potential (SCE) relative to saturated calomel electrode.Polarization curve uses Solartron1287 dynamic potential scanning, sweeps Retouching potential range is ± 0.2V vs.Ecorr (relative to corrosion potential), scanning speed 0.1667mV/s.Experiment is in room temperature Lower progress.Corrosion potential after electrochemical gaging is as follows, shown in table 3:
Corrosion point after 3 electrochemical gaging of table
Corrosion potential E vs.SCE, mV
Corten-A -603
Embodiment 1 -519
Embodiment 2 -506
2, period parent moistens test
Embodiment bridge steel plate is added according to " TB 2375-1993 railway weathering steel alternate-immersion test method " Work is compared at standard sample, and with Corten-A steel, carries out 72 hours and period soaking corrosion test in 144 hours, test result is such as Shown in table 4.
4 period soaking corrosion test result of table
Number 72 hours 144 hours 72 hours relatively corrosive rates 144 hours relatively corrosive rates
Corten-A 3.114 1.817 100% 100%
Embodiment 1 1.143 0.816 38.12% 49.16%
Embodiment 2 1.112 0.744 36.78% 45.86%
The present invention is not limited to the embodiment, anyone should learn that the structure made under the inspiration of the present invention becomes Change, the technical schemes that are same or similar to the present invention are fallen within the scope of protection of the present invention.
Technology not described in detail in the present invention, shape, construction portion are well-known technique.

Claims (6)

1. a kind of yield strength is not less than 345MPa Weather-resistance bridge steel, it is characterised in that: its ingredient and weight percent are C: 0.07~0.11%, Si:0.15%~0.30%, Mn:0.80~1.20%, P≤0.015%, S≤0.005%, Al:0.01 ~0.04%, Cr:0.20~0.40%, Cu:0.20~0.40%, Ni:0.20~0.50%, Nb:0.020~0.050%, Ti:0.010~0.040%, remaining is Fe and inevitable impurity.
2. a kind of yield strength is not less than 345MPa Weather-resistance bridge steel Preparation Method, it is characterised in that: including following process:
One, it smelts: being smelted using Linz-Donawitz process, top and bottom complex blowing, abundant decarburization, dephosphorization;Then by LF refining, RH application of vacuum reduces harmful element/impurity content, carries out microalloying;Then continuous casting, whole process protection casting, casting are carried out End obtains slab using weight Reduction Technology;
Two, slow cooling: after slab is cut, it is put into burial pit, slow cooling time is no less than 48 hours;
Three, heat: through recuperative heater, slab temperature of tapping is 1150~1180 DEG C;
Four, it rolling: being rolled using the two-stage, the heavy reduction rate of at least continuous 15% or more three passage is taken in roughing, subsequently into Finish rolling;
Five, cooling: steel plate roller repairing, 630~660 DEG C of final cooling temperature;
Six, stacking is cooling: carrying out stacking slow cooling after steel plate is cooling, slow cooling time is no less than 8 hours.
3. a kind of yield strength according to claim 2 is not less than 345MPa Weather-resistance bridge steel Preparation Method, feature exists In: in the smelting procedure, in continuous casting technostress, depress ratio 8~10%.
4. a kind of yield strength according to claim 2 is not less than 345MPa Weather-resistance bridge steel Preparation Method, feature exists In: in the heating process, using three sections of heating process, first segment: preheating section temperature sets 700~850 DEG C;Second segment: point It for 2-2 sections of 2-1 sections of heating and heating, heats 2-1 sections of temperature and sets 1050~1200 DEG C, in 1050~1100 DEG C of sections using fast Speed heating heats 2-2 sections of temperature and sets 1180~1230 DEG C;Third section: soaking zone furnace gas temperature is set as 1150~1200 DEG C.
5. a kind of yield strength according to claim 2 is not less than 345MPa Weather-resistance bridge steel Preparation Method, feature exists In: in the rolling process, as finished product thickness≤14mm, finish rolling finishing temperature is controlled at 830~880 DEG C, works as finished product thickness When > 14mm, finish rolling finishing temperature is controlled at 690~720 DEG C.
6. a kind of yield strength according to claim 2 is not less than 345MPa Weather-resistance bridge steel Preparation Method, feature exists In: in the cooling process, 4~8 DEG C/s of cooling rate.
CN201811260863.7A 2018-10-26 2018-10-26 A kind of yield strength is not less than 345MPa Weather-resistance bridge steel and preparation method thereof Pending CN109797341A (en)

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CN110629129A (en) * 2019-11-05 2019-12-31 山东钢铁集团日照有限公司 Flexible manufacturing method capable of simultaneously producing X52 and X60 grade pipeline steel
CN111719082A (en) * 2020-05-06 2020-09-29 唐山不锈钢有限责任公司 Hot-rolled weather-resistant steel strip and flexible manufacturing method thereof
CN113046627A (en) * 2021-02-01 2021-06-29 南京钢铁股份有限公司 345 MPa-grade weather-proof bridge steel and manufacturing method thereof
CN113957346A (en) * 2021-10-22 2022-01-21 山东钢铁集团日照有限公司 High-performance bridge steel with yield strength not less than 500MPa and preparation method and application thereof
CN114134414A (en) * 2021-11-12 2022-03-04 山东钢铁集团日照有限公司 Low-yield-ratio high-toughness steel and preparation method thereof
CN114150209A (en) * 2021-11-16 2022-03-08 山东钢铁集团日照有限公司 High-performance bridge steel with yield strength not less than 550MPa and preparation method and application thereof
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CN114645210A (en) * 2022-03-24 2022-06-21 山东钢铁集团日照有限公司 Ultrahigh-plasticity low-yield-ratio steel and preparation method thereof
WO2022160526A1 (en) * 2021-02-01 2022-08-04 南京钢铁股份有限公司 Weather-resistant bridge steel and smelting method therefor
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CN115323286A (en) * 2022-07-12 2022-11-11 包头钢铁(集团)有限责任公司 Rare earth microalloyed Q345 qDNH-grade weather-proof seamless steel tube for bridge and manufacturing method thereof
CN115505852A (en) * 2022-10-26 2022-12-23 河北普阳钢铁有限公司 Corrosion-resistant steel for agricultural machinery and manufacturing method thereof

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CN110629129A (en) * 2019-11-05 2019-12-31 山东钢铁集团日照有限公司 Flexible manufacturing method capable of simultaneously producing X52 and X60 grade pipeline steel
CN111719082A (en) * 2020-05-06 2020-09-29 唐山不锈钢有限责任公司 Hot-rolled weather-resistant steel strip and flexible manufacturing method thereof
WO2022160526A1 (en) * 2021-02-01 2022-08-04 南京钢铁股份有限公司 Weather-resistant bridge steel and smelting method therefor
CN113046627A (en) * 2021-02-01 2021-06-29 南京钢铁股份有限公司 345 MPa-grade weather-proof bridge steel and manufacturing method thereof
CN113957346A (en) * 2021-10-22 2022-01-21 山东钢铁集团日照有限公司 High-performance bridge steel with yield strength not less than 500MPa and preparation method and application thereof
CN114134414A (en) * 2021-11-12 2022-03-04 山东钢铁集团日照有限公司 Low-yield-ratio high-toughness steel and preparation method thereof
CN114150209A (en) * 2021-11-16 2022-03-08 山东钢铁集团日照有限公司 High-performance bridge steel with yield strength not less than 550MPa and preparation method and application thereof
CN114645125A (en) * 2022-03-03 2022-06-21 包头钢铁(集团)有限责任公司 Method for reducing yield ratio of weather-resistant bridge steel
CN114645210A (en) * 2022-03-24 2022-06-21 山东钢铁集团日照有限公司 Ultrahigh-plasticity low-yield-ratio steel and preparation method thereof
CN114959460A (en) * 2022-05-06 2022-08-30 鞍钢股份有限公司 Low-yield-ratio easy-to-weld weather-resistant bridge steel and manufacturing method thereof
CN114959460B (en) * 2022-05-06 2023-10-20 鞍钢股份有限公司 Low-yield-ratio easy-welding weather-resistant bridge steel and manufacturing method thereof
WO2023212972A1 (en) * 2022-05-06 2023-11-09 鞍钢股份有限公司 Low-yield-ratio, easy-to-weld and weather-proof bridge steel and manufacturing method therefor
CN115323286A (en) * 2022-07-12 2022-11-11 包头钢铁(集团)有限责任公司 Rare earth microalloyed Q345 qDNH-grade weather-proof seamless steel tube for bridge and manufacturing method thereof
CN115505852A (en) * 2022-10-26 2022-12-23 河北普阳钢铁有限公司 Corrosion-resistant steel for agricultural machinery and manufacturing method thereof

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Application publication date: 20190524