CN107583964A - The production method of easy pickling welding wire steel high-speed rod - Google Patents
The production method of easy pickling welding wire steel high-speed rod Download PDFInfo
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- CN107583964A CN107583964A CN201710948614.6A CN201710948614A CN107583964A CN 107583964 A CN107583964 A CN 107583964A CN 201710948614 A CN201710948614 A CN 201710948614A CN 107583964 A CN107583964 A CN 107583964A
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- wire rod
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- pickling
- warm case
- welding wire
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Abstract
The invention discloses a kind of production method of easily pickling welding wire steel high-speed rod, it includes spinning, stay-warm case slow cooling and collection volume process, in the stay-warm case slow cooling operation, the wire rod gone out after stay-warm case is quickly cooled down so that wire rod is not more than 20s in 550~450 DEG C of temperature range residence times through blower fan air blast.This method is by analyzing the composition structure of wire rod surface iron scale three times, pass through the optimization of cooling control after rolling technique, so that iron scale eutectoid reaction time of the product quickly through 450 DEG C~550 DEG C, considerably reduces the thickness of iron scale, while reduce the Fe for being difficult to pickling3O4Content；For the welding wire wire rod of this method production in downstream user pickling, acid consumption and pickling time reduce by more than 30%, significantly reduce spent acid discharge, reduce pollution of the spent acid to environment, improve production efficiency.
Description
Technical field
The present invention relates to a kind of production method of high-speed rod, especially a kind of production of easily pickling welding wire steel high-speed rod
Method.
Background technology
Welding material application covers the production process of whole national economy, is mainly used in steel building, large-scale petrochemical
The fields such as equipment, nuclear power engineering, shipbuilding, track traffic, pipeline engineering, engineering machinery, ocean engineering.Solid welding wire is in life
Need repeatedly to be drawn to below Φ 1mm during production, and carry out copper coating processing, therefore wire rod scale on surface is in welding wire
It must go in process except clean, otherwise can cause in drawing process wire rod surface tear, the copper facing final products such as loosely
Mass defect.
Iron scale removal majority uses pickling mode in welding wire production in the industry at present, and with national environmental protection policy
Constantly plus tight, user requires to reduce acid consumption and pickling time of the mother metal in acid cleaning process as far as possible, to reduce spent acid discharge
Amount and raising production efficiency.
Open source information shows at present, and for high-speed rod product, scale structure rolls rear fast quickly cooling for cord steel etc.
But high-carbon steel research it is more, also have relevant report for straight carbon steel, its control method mainly by adjust laying temperature and
Roller table speed is realized.But for welding wire steel, because of its product quality particular/special requirement, laying temperature and roller table speed adjustment leeway
It is minimum, the iron scale control method of such product is rarely reported.
The content of the invention
The technical problem to be solved in the present invention is to provide a kind of easy pickling welding wire steel that can be effectively reduced pickling difficulty is high
The production method of fast wire rod.
In order to solve the above technical problems, the technical solution used in the present invention is：It includes spinning, stay-warm case slow cooling and collection
Roll up process, in the stay-warm case slow cooling operation, the wire rod gone out after stay-warm case quickly cooled down through blower fan air blast so that wire rod 550~
450 DEG C of temperature range residence times are not more than 20s.
In stay-warm case slow cooling operation of the present invention, the temperature that wire rod goes out stay-warm case is 610~630 DEG C.The stay-warm case
In slow cooling operation, wire rod enters stay-warm case with 740~800 DEG C, and carrying out cooling with 1.0 DEG C/s and following cooling rate completes phase transformation.
In collection volume process of the present invention, the temperature that wire rod starts collection volume is 300~350 DEG C.
It is using beneficial effect caused by above-mentioned technical proposal：The present invention is by analyzing wire rod surface iron oxide three times
The composition structure of skin, passes through the optimization of cooling control after rolling technique so that product is total to quickly through 450 DEG C~550 DEG C of iron scale
The reaction time is analysed, considerably reduces the thickness of iron scale, while reduce the Fe for being difficult to pickling3O4Content；Present invention production
Welding wire wire rod in downstream user pickling, acid consumption and pickling time reduce by more than 30%, significantly reduce spent acid row
Put, reduce pollution of the spent acid to environment, improve production efficiency.
Present invention improves the structure of high-speed rod product surface iron scale, reduce downstream user pickling acid consumption and
Pickling time, spent acid discharge is reduced, reduces environmental pollution and improves production efficiency, dirt is reduced by reducing spent acid discharge
It is very notable to contaminate the social and economic benefit created.
Brief description of the drawings
The present invention is further detailed explanation with reference to the accompanying drawings and detailed description.
Fig. 1 is produced the metallographic structure figure of wire rod ER70S-6 iron scales by the inventive method；
Fig. 2 is the metallographic structure figure that traditional handicraft produces wire rod ER70S-6 iron scales；
Fig. 3 schemes by institute production wire rod ER70S-6 of the invention metallographic structure composition；
Fig. 4 is the metallographic structure composition figure that traditional handicraft produces wire rod ER70S-6.
Embodiment
The design principle of this easily production method of pickling welding wire steel high-speed rod is as described below：
（1）Iron scale generating principle and composition analysis：The production process of welding wire steel high-speed rod include heating, rolling, spinning,
Stay-warm case slow cooling and collection volume process；In heating process, steel billet generates once oxidation iron sheet in heating process in the stove is heated, mainly
Water under high pressure dephosphorizing machine removes when being come out of the stove by steel billet；In rolling process, steel generate secondary oxidation iron during mill milling
Skin, relies primarily on the deformation process rolled in pass and additional (operating) water nozzle or compressed air purging removes；In rolling process,
Iron scale three times is generated in control of product cooling after mm finishing mill unit finish to gauge, is attached to product surface.Iron scale exists three times
Downstream user is needed to be removed by mechanical dephosphorization or pickling before final use.
Pertinent literature shows that iron scale is formed by three layers, among thick ferrous oxide internal layer, relatively thin ferroso-ferric oxide
Layer and a small amount of di-iron trioxide of outer layer, three's ratio when rolling for 1000 DEG C is 95:4:1.Iron scale grows more than 700 DEG C
Generating rate is relatively low when more rapidly, less than 700 DEG C.
According to FE-O equilbrium phase diagrams, FeO is in stable state at 570 DEG C~1371 DEG C, and when below 570 DEG C, FeO occurs
Eutectoid reaction, generate Fe and Fe3O4Mix products.FeO oxygen content at 850 DEG C~1000 DEG C than relatively low, in temperature 350
DEG C~550 DEG C compare significantly, therefore when temperature gradually reduces, the oxygen content in FeO layers progressivelyes reach hypersaturated state, causes
Close to Fe3O4Pro-eutectoid Fe is separated out in the FeO layers of layer3O4, its reaction equation is：4FeO→Fe3O4+Fe。
According to open research data show " nose " temperature of mild steel FeO layers pro-eutectoid or eutectoid reaction for 450 DEG C~
550℃。
FeO in iron scale is relatively easy to remove in pickling, Fe3O4With magnetic attachment acid is difficult in steel surface
Wash.Therefore, the main path for reducing pickling acid consumption and pickling time reduces iron scale gross thickness and iron scale for wire rod
Fe in tissue3O4Content.Be advantageous to the FeO and Fe of de-scaling pickling3O4Solid solution at 575 DEG C above is stable, 575 DEG C
FeO is unstable when following, and according to 4FeO=Fe3O4+ Fe is decomposed, when temperature is further decreased to below 300 DEG C, this turn
Change levels off to zero；If iron scale rapidly cools down at 570~300 DEG C of lower temperature, then FeO and Fe3O4Solid solution comes not
And decompose, it is fixed at lower temperatures；Most of be decomposed into largely is decomposed into if FeO in iron sheet if Slow cooling
Fe3O4。
After wire rod completes phase transformation, by certain cooling means, wire rod is set to run through 550 DEG C~450 DEG C iron oxide
Skin eutectoid reaction temperature range, avoid FeO that eutectoid reaction occurs and generates Fe3O4,Simultaneously iron scale is avoided to continue to increase
Thickness, it is the controlling technical method for subtracting pickling welding wire steel iron scale.
（2）Traditional handicraft is analyzed：Welding wire steel high-speed rod in process of production, solid welding wire wire rod mother metal need to ensure from
Φ 5.5mm stably pull to Φ 0.8mm and fracture of wire do not occur, therefore the metallographic structure of butt welding screw material has strict demand, it is desirable to
To be organized as ferrite and a small amount of pearlite, it is impossible to the over-cooling structures such as bainite, martensite be present.In order to ensure the gold of product
Phase constitution, solid welding wire wire product, by water-cool control laying temperature, must add after finish to gauge when air-cooled roller-way cools down
Stay-warm case slow cooling, stay long enough is beaten with being collected again after extremely low temperature drop rate completion phase transformation in stay-warm case
Bag.
Due to needing the metallographic structure of guarantee wire rod, the laying temperature of welding wire is substantially stationary, is needed after spinning in stay-warm case
It is interior to complete phase transformation not higher than the temperature drop rate Slow cooling in 1 degrees second, therefore welding wire steel is in 800 DEG C~700 DEG C high temperature sections
Iron scale generating process controllable factor it is seldom；The emphasis of iron scale composition is controlled to pass through after wire rod completes phase transformation
The method that the time that eutectoid reaction occurs for iron scale is greatly lowered forms to improve iron scale.
Traditional handicraft wire rod goes out after stay-warm case coil overlapped points temperature at 610 DEG C~630 DEG C completing phase transformation, non-overlapping point
Temperature is at 500 DEG C~530 DEG C, and temperature is respectively 460 DEG C~480 DEG C and 320 DEG C~350 DEG C when reaching collection roll barrel.450 DEG C~
In 550 DEG C of temperature ranges, wire rod is in the intensive slow haulage stage, and the iron scale of Surface Creation has enough time that eutectoid occurs
Reaction.Wire rod is from cover is gone out to run time is collected about 100 seconds, and in this traffic coverage, wire rod is with 1.5~2 DEG C/sec of cooling speed
Rate is run.The section is approximately equal to FeO layers and stopped 100 seconds in 550~450 DEG C of transformation sections, gives FeO layers longer analysis
Go out Fe3O4Time, and iron scale may proceed to thicken.Fe3O4Wire rod iron matrix surface is attached to magnetic compact, and
And difficulty is dissolved in acid, thus it is long in the stop of this silicon carbide time, product pickling acid consumption and pickling time increase can be caused.
（3）This method technique：This method is improved to old technology, and technique is as follows：The wire rod that the finishing rolling step obtains
Enter spinning process after 3~4 water cooling boxes cool down, laying temperature is controlled at 830~870 DEG C.Wire rod, which enters, after spinning protects
Warm cover slow cooling operation, wire rod enter stay-warm case with 740~800 DEG C, and carrying out cooling with 1.0 DEG C/sec and following cooling rate completes phase
Become, the wire rod after phase transformation goes out stay-warm case with 610~630 DEG C；The wire rod gone out after stay-warm case is quickly cooled down so that line through blower fan air blast
Material is not more than 20 seconds in 550~450 DEG C of temperature range residence times.Wire rod is cooled to 300~350 DEG C and enters collection volume process progress
Collection volume.In said process, after wire rod completion phase transformation goes out stay-warm case, last close collection of appropriate unlatching air-cooled line rolls up position
Blower fan, while improve wire rod and go out roller-way transporting velocity after stay-warm case, coil spacing is widened to strengthen cooling effect, makes wire rod rapid
Pass through eutectoid reaction temperature range（550~450 DEG C）.For this method compared with traditional handicraft, the temperature under different process is shown in Table 1,
The iron scale composition of different process is shown in Table 2.
Table 1：Temperature under wire rod different process
Table 2：The iron scale composition of different process
Embodiment 1：The production method of this easily pickling welding wire steel high-speed rod uses following concrete technologies.
The present embodiment produces ER70S-6 welding wire wire rods, and specification is Φ 5.5mm.The wire rod warp that the finishing rolling step obtains
Enter spinning process after crossing 3 water cooling box coolings, laying temperature is controlled at 830~860 DEG C.Wire rod delays into stay-warm case after spinning
Cooling working procedure, wire rod enter stay-warm case with 780~800 DEG C, and carrying out cooling with 0.7~0.9 DEG C/s cooling rate completes phase transformation, after phase transformation
Wire rod go out stay-warm case at 610~620 DEG C；The wire rod gone out after stay-warm case quickly cooled down through blower fan air blast so that wire rod 550~
450 DEG C of temperature range residence times are 16s.Wire rod is cooled to 330~350 DEG C and carries out collection volume, typical set volume into collection volume process
330 degree of temperature（It is middle）With 350 degree（Overlapped points）.
Identical wire rod is processed into as a comparison by wire rod using traditional handicraft, Fig. 1 is wire rod iron oxide obtained by this method
The metallographic structure figure of skin, Fig. 2 are the metallographic structure figures of wire rod iron scale obtained by traditional handicraft, and as seen from the figure, this method is effective
Ground reduces iron scale gross thickness, Fe3O4Content significantly reduces.The metallographic structure composition figure of Fig. 3 wire rods obtained by this method,
Fig. 4 is the metallographic structure composition figure of wire rod obtained by traditional handicraft, and as seen from the figure, two kinds of handicraft product metallographic compositions are ferrite
With a small amount of pearlite, tissue without exception, the metallographic structure and mechanical property for illustrating product do not have anomalous variation.
After testing, the iron scale situation average out to of wire rod obtained by this method：5.60 μm of gross thickness, Fe3O4 0.46μm、
Fe0 5.14μm；The iron scale situation average out to of wire rod obtained by traditional handicraft：14.00 μm of gross thickness, Fe3O4 2.31μm、Fe0
11.69μm；It can be seen that the iron scale gross thickness of the welding wire steel wire rod of this method production is reduced to the 40% of traditional handicraft wire rod, indissoluble
In the Fe of acid3O4The 19.9% of traditional handicraft wire rod is reduced to, from iron scale total amount and Fe3O4Pickling is advantageously reduced in content
Acid consumption and pickling time；Product through pickling, pickling acid consumption and pickling time reduce 20 compared with traditional handicraft wire rod~
30%, significant effect.
Embodiment 2：The production method of this easily pickling welding wire steel high-speed rod uses following concrete technologies.
The present embodiment is in certain high line Workshop Production joint venture customization H11Mn2SiA gas protecting welding wire wire rod, rule
Lattice are Φ 5.5mm.The wire rod that the finishing rolling step obtains enters spinning process, laying temperature control after 4 water cooling boxes cool down
System is at 830~860 DEG C.Wire rod enters stay-warm case with 740~750 DEG C after spinning, is cooled down with 0.6~0.8 DEG C/s cooling rate
Phase transformation is completed, the wire rod after phase transformation goes out stay-warm case with 620~630 DEG C；The wire rod gone out after stay-warm case quickly cools down through blower fan air blast
So that wire rod is 20s in 550~450 DEG C of temperature range residence times.Wire rod is cooled to 320 DEG C（It is middle）~350 DEG C（Overlap joint
Point）Collection volume is carried out into collection volume process, is subsequently collected, packs.
Using conventionally produced Φ 5.5mmH11Mn2SiA gas protecting welding wire wire rods, sampling produces with this method
Wire rod be processed into and inlay sample as a comparison, detected under an optical microscope, the oxygen of the wire rod produced using this method
Changing iron sheet measurement data average value is：5.52 μm of gross thickness, Fe3O40.48μm、Fe0 5.71μm；Wire rod obtained by traditional handicraft
Iron scale situation average out to：16.10 μm of gross thickness, Fe3O42.75μm、Fe0 11.72μm；It can be seen that the weldering of this method production
The iron scale gross thickness of silk steel wire rod, the Fe for being insoluble in acid3O4Thickness ratio traditional handicraft significantly reduce, iron scale total amount
And Fe3O4The acid consumption and pickling time of pickling are advantageously reduced in content；Product is through pickling, when pickling acid consumption and pickling
Between reduce more than 30% compared with traditional handicraft wire rod, user's reflection is good.
Embodiment 3：The production method of this easily pickling welding wire steel high-speed rod uses following concrete technologies.
The present embodiment produces ER50S-6 welding wire wire rods, and specification is Φ 5.5mm.The wire rod warp that the finishing rolling step obtains
Enter spinning process after crossing 3 water cooling box coolings, laying temperature is controlled at 840~870 DEG C.Wire rod delays into stay-warm case after spinning
Cooling working procedure, wire rod enter stay-warm case with 760~780 DEG C, and carrying out cooling with 0.8~1.0 DEG C/s cooling rate completes phase transformation, after phase transformation
Wire rod go out stay-warm case at 615~625 DEG C；The wire rod gone out after stay-warm case quickly cooled down through blower fan air blast so that wire rod 550~
450 DEG C of temperature range residence times are 18s.Wire rod is cooled to 330~350 DEG C and carries out collection volume, typical set volume into collection volume process
300 degree of temperature（It is middle）With 320 degree（Overlapped points）.
Using conventionally produced Φ 5.5mm ER50S-6 gas protecting welding wire wire rods, sampling produces with this method
Wire rod be processed into and inlay sample as a comparison, detected under an optical microscope, the oxygen of the wire rod produced using this method
Changing iron sheet measurement data average value is：5.62 μm of gross thickness, Fe3O40.50μm、Fe0 5.13μm；Wire rod obtained by traditional handicraft
Iron scale situation average out to：17.17 μm of gross thickness, Fe3O42.92μm、Fe0 10.90μm；It can be seen that the weldering of this method production
The iron scale gross thickness of silk steel wire rod, the Fe for being insoluble in acid3O4Thickness ratio traditional handicraft significantly reduce, iron scale total amount
And Fe3O4The acid consumption and pickling time of pickling are advantageously reduced in content；Product is through pickling, when pickling acid consumption and pickling
Between compared with traditional handicraft wire rod reduce 20%~30%.
Claims (4)
1. a kind of production method of easily pickling welding wire steel high-speed rod, it includes spinning, stay-warm case slow cooling and collection volume process, and it is special
Sign is：In the stay-warm case slow cooling operation, the wire rod that goes out after stay-warm case quickly cooled down through blower fan air blast so that wire rod 550~
450 DEG C of temperature range residence times are not more than 20s.
2. the production method of easily pickling welding wire steel high-speed rod according to claim 1, it is characterised in that：The stay-warm case
In slow cooling operation, the temperature that wire rod goes out stay-warm case is 610~630 DEG C.
3. the production method of easily pickling welding wire steel high-speed rod according to claim 2, it is characterised in that：The stay-warm case
In slow cooling operation, wire rod enters stay-warm case with 740~800 DEG C, and carrying out cooling with 1.0 DEG C/s and following cooling rate completes phase transformation.
4. the production method of the easy pickling welding wire steel high-speed rod according to claim 1,2 or 3, it is characterised in that：It is described
In collection volume process, the temperature that wire rod starts collection volume is 300~350 DEG C.
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| CN201710948614.6A CN107583964A (en) | 2017-10-12 | 2017-10-12 | The production method of easy pickling welding wire steel high-speed rod |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112642859A (en) * | 2020-12-03 | 2021-04-13 | 广东韶钢松山股份有限公司 | Easy-pickling low-carbon steel wire rod and control method for surface iron scale thereof |
| CN113680814A (en) * | 2021-08-24 | 2021-11-23 | 攀钢集团研究院有限公司 | Method for controlling iron scale on surface of medium-carbon low-alloy wire |
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| CN102699055A (en) * | 2012-06-15 | 2012-10-03 | 首钢总公司 | Method for improving mechanical dephosphorization of iron scale of low-carbon cold heading steel wire rod |
| CN103240271A (en) * | 2013-04-18 | 2013-08-14 | 首钢总公司 | Production method for reducing dynamic drawing aging of low-carbon steel wire rods |
| CN103506382A (en) * | 2013-07-31 | 2014-01-15 | 秦皇岛首秦金属材料有限公司 | Production method for improving surface quality of thick-standard ship plate |
| CN107138522A (en) * | 2017-04-27 | 2017-09-08 | 邢台钢铁有限责任公司 | A kind of cold-forging steel containing Cr hot rolling wire production method of easy pickling after annealing |
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2017
- 2017-10-12 CN CN201710948614.6A patent/CN107583964A/en not_active Withdrawn
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102699055A (en) * | 2012-06-15 | 2012-10-03 | 首钢总公司 | Method for improving mechanical dephosphorization of iron scale of low-carbon cold heading steel wire rod |
| CN103240271A (en) * | 2013-04-18 | 2013-08-14 | 首钢总公司 | Production method for reducing dynamic drawing aging of low-carbon steel wire rods |
| CN103506382A (en) * | 2013-07-31 | 2014-01-15 | 秦皇岛首秦金属材料有限公司 | Production method for improving surface quality of thick-standard ship plate |
| CN107138522A (en) * | 2017-04-27 | 2017-09-08 | 邢台钢铁有限责任公司 | A kind of cold-forging steel containing Cr hot rolling wire production method of easy pickling after annealing |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112642859A (en) * | 2020-12-03 | 2021-04-13 | 广东韶钢松山股份有限公司 | Easy-pickling low-carbon steel wire rod and control method for surface iron scale thereof |
| CN112642859B (en) * | 2020-12-03 | 2022-04-12 | 广东韶钢松山股份有限公司 | Easy-pickling low-carbon steel wire rod and control method for surface iron scale thereof |
| CN113680814A (en) * | 2021-08-24 | 2021-11-23 | 攀钢集团研究院有限公司 | Method for controlling iron scale on surface of medium-carbon low-alloy wire |
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Application publication date: 20180116 |