CN103122437A - Vanadium-silicon microalloyed super-strength wire rod and production process thereof - Google Patents
Vanadium-silicon microalloyed super-strength wire rod and production process thereof Download PDFInfo
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- CN103122437A CN103122437A CN201110366120XA CN201110366120A CN103122437A CN 103122437 A CN103122437 A CN 103122437A CN 201110366120X A CN201110366120X A CN 201110366120XA CN 201110366120 A CN201110366120 A CN 201110366120A CN 103122437 A CN103122437 A CN 103122437A
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Abstract
The invention discloses a vanadium-silicon microalloyed super-strength wire rod and a production process thereof. The vanadium-silicon microalloyed super-strength wire rod comprises basic chemical components including, by weight, 0.85-0.95% of C, 0.95-1.10% of Si, 0.50-0.60% of Mn, 0.20-0.35% of Cr, 0.01-0.05% of Ti, 0.005-0.050% of Al, 0.11-0.15% of V, selective components, including any of 0.01-0.15% of Ni, 0.001-0.25% of Cu, 0.0001-0.005% of B, 0.001-0.03% of Nb and 0.001-0.03% of M, the balance of Fe and impurities. The production process includes sequentially performed steps of heating, rolling and cold controlling. The cold controlling step uses Stelmor controlled cooling, cooling speed before phase change is above 10K/s, and the cooling speed in late phase change is 1-3K/s. The vanadium-silicon microalloyed super-strength wire rod is more than 13700MPa in tensile strength, more than 35% in section shrinkage and more than 95% in sorbite rate, and is applicable to production of products such as super-strength prestress steel strands and galvanized steel strands.
Description
Technical field
The present invention be more particularly directed to a kind of vanadium silicon combined microalloying superstrength wire rod and preparation technology thereof, belong to ferrous metallurgy and steel rolling field.
Background technology
Bridge, highway, power station and Highrise buildings etc. construction need a large amount of prestress wire and galvanized steel wire.Along with the continuous increase of bridge span, also more and more higher with the requirement of strength of prestress wire and galvanized steel wire to bridge.High strength and large normalization are the main development directions of prestress wire and Stranded Galvanized Steel Wire, and the high-strength and high ductility of steel wire is the inexorable trend of meeting the market requirement.
The raising of wire rod intensity can reduce the building materials usage quantity, shortens building cycle, saves construction cost.By improving wire rod intensity, Japanese alum strait Bridge has been saved the construction cost of 1,700,000,000 yuan, and makes the construction period shorten 5 months.On the developing direction of wire rod high-strength and high ductility, the technology of Japan is in the forward position level.Nippon Steel has developed 2300MPa level steel strand wire rod, and successfully realizes producing and using, and the steel strand of 2500MPa level are are also researched and developed.At present domesticly realized that the prestress wire maximum intensity rank of volume production is 2000MPa, the maximum intensity rank of galvanized steel wire is 1770MPa.It is reported, Baosteel has been developed 1860MPa level galvanized steel wire wire rod.For the prestress wire of 2140MPa level and the galvanized steel wire of 1960MPa level, the present domestic report that there is not yet this intensity rank steel wire and steel strand and corresponding wire rod develop.
Compare with common 82B wire rod, the intensity rank span of superstrength rank high-carbon steel wire rod is larger, composition range and production technique definite most important.Alloying is one of common methods that improves the steel over-all properties.Add appropriate alloying element in steel, can realize the highly malleablized of steel, and other performance is also improved.Add vanadium and silicon in steel, by precipitation strength and solution strengthening effect, can improve the intensity of original wire rod, and vanadium alleviates in addition center segregation and suppresses the effect of cementite network, silicon is conducive to improve the thermostability of galvanized steel wire.
For the production of high-carbon steel wire rod, center segregation and cementite network are two common subject matters.The existence of center segregation makes wire rod heart section easily produce harmful tissues such as martensite, all will produce detrimentally affect to the mechanical property of wire rod and drawing property etc.The generation of cementite network makes wire rod generation brittle rupture, and is very big to the performance hazards of wire rod.
Summary of the invention
The invention provides a kind of vanadium silicon combined microalloying superstrength wire rod and preparation technology thereof, the tensile strength of this superstrength wire rod is more than 1370MPa, relative reduction in area is more than 35%, this wire rod can be used for producing the products such as high strength prestressed steel strand and Stranded Galvanized Steel Wire, simultaneously, its preparation technology is simple to operation, and is with low cost.
For achieving the above object, the present invention has adopted following technical scheme:
A kind of vanadium silicon combined microalloying superstrength wire rod is characterized in that, the chemical composition that it comprises and weight percent thereof are:
Basal component: C 0.85-0.95%, Si 0.95-1.10%, Mn 0.50-0.60%, Cr0.20-0.35%, Ti 0.01-0.05%, Al 0.005-0.050%, V 0.11-0.15%;
Optional component: any one in Ni 0.001-0.15%, Cu 0.001-0.25%, B 0.0001-0.005%, Nb0.001-0.03% and Mo 0.001-0.03% or two or more;
And, the Fe of surplus and impurity.
The tensile strength of described superstrength wire rod is more than 1370MPa, and relative reduction in area is more than 35%, and sorbitic rate is more than 95%, and the average sheet interlayer spacing of perlite is below 80nm.
The preparation technology of this vanadium silicon combined microalloying superstrength wire rod comprises the heating that the strand that has with above-mentioned vanadium silicon combined microalloying superstrength wire rod same composition is carried out successively, rolling and control cooling working procedure, wherein, it is cooling that the control cooling working procedure adopts stelmor to control, adopt the above speed of cooling of 10K/s before phase transformation, the phase transformation later stage is adopted the speed of cooling of 1-3K/s.
In described heating process, furnace temp is 1120 ± 20 ℃; In described rolling process, laying temperature is 880 ± 10 ℃.
Elaborate below in conjunction with the effect of each component Composition Design to superstrength wire rod of the present invention:
The C element has significant solution strengthening effect as interstitial atom, can significantly improve the intensity of steel.For improving wire rod intensity, should increase the C constituent content.But the increase of C element is not unconfined.Too high C content can make the plasticity of steel descend, and the segregation degree is aggravated, and causes the generation of cementite network.Therefore, should be in conjunction with working condition, choose reasonable C content.In the present invention, C content is controlled at 0.85-0.95%.
Si can significantly improve elastic limit, yield strength and the tensile strength of steel, is also reductor commonly used in steelmaking process.Si has the effect of stable cementite, can suppress the decomposition of cementite when steel wire carries out pot galvanize.Adding silicon in high strength high carbon steel, is favourable to the thermostability that increases galvanized steel wire.But Si has the graphited effect of promotion, makes steel that decarburization easily occur.In the present invention, Si content is controlled at 0.95-1.10%.
Mn can improve the intensity of steel, improves mechanical property.But Mn obviously improves the hardening capacity of steel, and the counter productive of coarsened grain and increase temper brittleness is arranged.Mn too high levels in high carbon steel easily causes martensitic generation, and promotes center segregation.In the present invention, Mn content is controlled at 0.50-0.60%.
Cr improves intensity and the wear resistance of steel, can significantly improve the antioxygenation of steel, increases the resistance to corrosion of steel.But Cr also can increase the hardening capacity of steel, promotes martensitic generation.In the present invention, Cr content is controlled at 0.20-0.35%.
V is one of alloying element of commonly using, can improve intensity, yield tensile ratio and the low-temperature flexibility of steel.V can form compound with C, N and O etc., and the effect of precipitation strength is arranged.Due to the combination of V and C, reduced the solid solution C atom in the matrix, the effect that alleviates center segregation is arranged.In addition, the VC fine particle of formation is separated out on crystal boundary, can effectively suppress the formation of cementite network.But the price comparison of vanadium iron is high.In the present invention, V content is controlled at 0.11-0.15%.
In the present invention, for improving wire rod intensity, it is higher that C content designs.And for fear of increasing caused center segregation and cementite network due to C content, added the V of 0.11-0.15%, in addition, the V that adds can also play thinning microstructure, propose high-intensity effect.For reducing hardening capacity, improving plasticity, Mn content is down to the scope of 0.50-0.60%, this content is lower than the Mn content in common 82B.In addition, for stablizing the performance of steel wire after pot galvanize and stabilization treatment, and further improve the twisting property of intensity and steel wire, Si content is designed to the higher level of 0.95-1.10%.
Consider that cementite network and heart section martensite are two subject matters that high carbon steel runs into when producing.For eliminating this two kinds of abnormal structures, except Composition Design was considered, rolling and process of cooling of the present invention is controlled according to following parameter: furnace temp was 1120 ± 20 ℃, and laying temperature is 880 ± 10 ℃, adopts stelmor control cooling.In the cold process of control, it is cooling that the present invention adopts stelmor to control, and before phase transformation, speed of cooling more than 10K/s, adopts speed of cooling faster, to form more tiny sorbite lamella, improves intensity and plasticity; Simultaneously, fan delivery is made as 100%, improves as far as possible roller-way speed, reduces the wire rod tap density, and is cooling fast to realize, prevents the generation of cementite network; After phase transformation, speed of cooling between 1-3K/s, realizes slow cooling, makes supercooled austenite fully change perlite into, prevents the martensitic generation of heart section's large size, and simultaneously, fan delivery is made as 50%, reduces roller table speed.
Description of drawings
Fig. 1 is the cooling chart of surveying on the Stelmor line in a preferred embodiment of the present invention;
Fig. 2 a and Fig. 2 b are respectively the metallographic structure photos of vanadium silicon combined microalloying superstrength wire rod in a preferred embodiment of the present invention.
Embodiment
Below in conjunction with accompanying drawing and a preferred embodiment, technical scheme of the present invention is further described.
The chemical composition that the present embodiment vanadium silicon combined microalloying superstrength wire rod comprises is (wt%): C 0.90, and Si 1.04, and Mn 0.54, and Cr 0.275, and Ti 0.038, and Al 0.034, and V 0.112, and the Fe of surplus and inevitable impurity.
The preparation technology of this vanadium silicon combined microalloying superstrength wire rod is as follows: the strand that will contain mentioned component is heated to 1120 ± 20 ℃, and laying temperature is 880 ± 10 ℃, and the cold control cool condition according to table 1 of Stelmor control carries out.Figure 1 shows that the cooling curve of surveying on the Stelmor line, the speed of cooling before phase transformation is more than 10K/s, and the cooling rate after phase transformation is between 1-3K/s.
Consult table 2 and Fig. 2 a-2b, the present embodiment obtains the tensile strength of one batch of 13mm wire rod product all more than 1370MPa, relative reduction in area is all more than 35%, it is organized as tiny sorbite, sorbitic rate is up to 97.8%, sorbite sheet interlayer spacing mean value is 76nm, far below the sheet interlayer spacing size (100-200nm) of common 82B.Fig. 2 b consulted in the martensite that only has minute quantity in tissue, and overall dimension is no more than 12 μ m.This product mechanical property is excellent, and fine microstructures is even, can be used for producing the products such as high strength prestressed steel strand and Stranded Galvanized Steel Wire.
Table 1Stelmor control cool condition
The mechanical property of table 2 gren rod
| Wire rod diameter/mm | State | Tensile strength/MPa | Reduction of area/% |
| 13 | Gren rod | 1425 | 42.6 |
| 13 | Gren rod | 1374 | 35.5 |
| 13 | Gren rod | 1514 | 43.8 |
| 13 | Gren rod | 1436 | 40.5 |
| 13 | Gren rod | 1380 | 35.1 |
| 13 | Gren rod | 1438 | 42.9 |
| Mean value | ------ | 1427.8 | 40.1 |
Claims (6)
1. a vanadium silicon combined microalloying superstrength wire rod, is characterized in that, the chemical composition that it comprises and weight percent thereof are:
Basal component: C 0.85-0.95%, Si 0.95-1.10%, Mn 0.50-0.60%, Cr0.20-0.35%, Ti 0.01-0.05%, Al 0.005-0.050%, V 0.11-0.15%;
Optional component: any one in Ni 0.001-0.15%, Cu 0.001-0.25%, B 0.0001-0.005%, Nb0.001-0.03% and Mo 0.001-0.03% or two or more;
And, the Fe of surplus and impurity.
2. vanadium silicon combined microalloying superstrength wire rod according to claim 1, it is characterized in that, this superstrength wire rod be by include the heating carried out successively, preparation technology rolling and the control cooling working procedure makes, wherein, it is cooling that the control cooling working procedure adopts stelmor to control, adopt the above speed of cooling of 10K/s before phase transformation, the phase transformation later stage is adopted the speed of cooling of 1-3K/s.
3. vanadium silicon combined microalloying superstrength wire rod according to claim 1, is characterized in that, in described heating process, furnace temp is 1120 ± 20 ℃; In described rolling process, laying temperature is 880 ± 10 ℃.
4. vanadium silicon combined microalloying superstrength wire rod according to claim 1, it is characterized in that, the tensile strength of described superstrength wire rod is more than 1370MPa, and relative reduction in area is more than 35%, sorbitic rate is more than 95%, and the average sheet interlayer spacing of perlite is below 80nm.
5. the preparation technology of a vanadium silicon combined microalloying superstrength wire rod, it is characterized in that, this preparation technology comprises having the heating of carrying out successively with the strand of vanadium silicon combined microalloying superstrength wire rod same composition as claimed in claim 1, rolling and control cooling working procedure, wherein, it is cooling that the control cooling working procedure adopts stelmor to control, adopt the above speed of cooling of 10K/s before phase transformation, the phase transformation later stage is adopted the speed of cooling of 1-3K/s.
6. the preparation technology of vanadium silicon combined microalloying superstrength wire rod according to claim 5, is characterized in that, in described heating process, furnace temp is 1120 ± 20 ℃; In described rolling process, laying temperature is 880 ± 10 ℃.
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Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104451420A (en) * | 2014-12-15 | 2015-03-25 | 天津冶金集团中兴盛达钢业有限公司 | Low-temperature resistant steel strand suitable for liquefied natural gas engineering and production method thereof |
| WO2015120634A1 (en) * | 2014-02-11 | 2015-08-20 | 江苏省沙钢钢铁研究院有限公司 | High-carbon steel wire rod and preparation method therefor |
| CN107747059A (en) * | 2017-11-30 | 2018-03-02 | 攀钢集团攀枝花钢铁研究院有限公司 | Steel wire rod and its production method are built containing V, Ti, Cr microalloy |
| CN108396238A (en) * | 2017-02-05 | 2018-08-14 | 鞍钢股份有限公司 | A kind of 1860MPa grades of corrosion resisting steel wire rods for steel strands and its production method |
| CN108796166A (en) * | 2018-04-25 | 2018-11-13 | 马钢(集团)控股有限公司 | A kind of high strength steel and snap ring manufacturing method |
| CN109554631A (en) * | 2017-09-26 | 2019-04-02 | 宝山钢铁股份有限公司 | A kind of low-alloy steel and steel wire prepared therefrom processing High-strength high-plasticity wire rod |
| CN110747394A (en) * | 2019-10-08 | 2020-02-04 | 鞍钢股份有限公司 | Wire rod for 2000MPa grade high-strength galvanized steel wire and production method thereof |
| CN111979475A (en) * | 2020-06-05 | 2020-11-24 | 包头钢铁（集团）有限责任公司 | Wire rod for ultrahigh-strength steel strand and preparation method thereof |
| CN112176258A (en) * | 2020-09-30 | 2021-01-05 | 江苏省沙钢钢铁研究院有限公司 | Wire rod for 2500 MPa-grade steel strand and manufacturing method thereof |
| CN113355595A (en) * | 2021-05-19 | 2021-09-07 | 天津荣程联合钢铁集团有限公司 | Large-size high-strength prestressed steel, preparation process and application thereof |
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Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS62238327A (en) * | 1986-04-08 | 1987-10-19 | Nippon Steel Corp | Manufacture of high strength steel wire rod superior in workability |
| JPH06330239A (en) * | 1993-05-20 | 1994-11-29 | Kobe Steel Ltd | High carbon steel wire rod excellent in wire drawability and wire stranding property |
| CN1341155A (en) * | 1999-12-22 | 2002-03-20 | 新日本制铁株式会社 | Direct patenting high strength wire rod and method for producing same |
| CN101208446A (en) * | 2005-06-29 | 2008-06-25 | 新日本制铁株式会社 | High-strength wire rod having superior rod drawability, and manufacturing method therefor |
| CN101528965A (en) * | 2006-10-31 | 2009-09-09 | 株式会社神户制钢所 | Steel wire for spring excellent in fatigue property and drawing property |
| CN102181786A (en) * | 2011-04-25 | 2011-09-14 | 江苏省沙钢钢铁研究院有限公司 | Coil rod used for 1670MPa level bridge cable zinc-coated wire and preparation method of coil rod |
-
2011
- 2011-11-18 CN CN201110366120XA patent/CN103122437A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS62238327A (en) * | 1986-04-08 | 1987-10-19 | Nippon Steel Corp | Manufacture of high strength steel wire rod superior in workability |
| JPH06330239A (en) * | 1993-05-20 | 1994-11-29 | Kobe Steel Ltd | High carbon steel wire rod excellent in wire drawability and wire stranding property |
| CN1341155A (en) * | 1999-12-22 | 2002-03-20 | 新日本制铁株式会社 | Direct patenting high strength wire rod and method for producing same |
| CN101208446A (en) * | 2005-06-29 | 2008-06-25 | 新日本制铁株式会社 | High-strength wire rod having superior rod drawability, and manufacturing method therefor |
| CN101528965A (en) * | 2006-10-31 | 2009-09-09 | 株式会社神户制钢所 | Steel wire for spring excellent in fatigue property and drawing property |
| CN102181786A (en) * | 2011-04-25 | 2011-09-14 | 江苏省沙钢钢铁研究院有限公司 | Coil rod used for 1670MPa level bridge cable zinc-coated wire and preparation method of coil rod |
Cited By (16)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2015120634A1 (en) * | 2014-02-11 | 2015-08-20 | 江苏省沙钢钢铁研究院有限公司 | High-carbon steel wire rod and preparation method therefor |
| KR101860481B1 (en) * | 2014-02-11 | 2018-05-23 | 인스티튜트 오브 리서치 오브 아이론 앤드 스틸, 지앙수 프로빈스/샤-스틸, 씨오. 엘티디 (중국) | High-carbon steel wire rod and preparation method therefor |
| US10316386B2 (en) | 2014-02-11 | 2019-06-11 | Institute of Research of Iron and Steel, Jiangsu Province/Sha-Steel, Co. Ltd. | High-carbon steel wire rod and preparation method therefor |
| CN104451420A (en) * | 2014-12-15 | 2015-03-25 | 天津冶金集团中兴盛达钢业有限公司 | Low-temperature resistant steel strand suitable for liquefied natural gas engineering and production method thereof |
| CN108396238A (en) * | 2017-02-05 | 2018-08-14 | 鞍钢股份有限公司 | A kind of 1860MPa grades of corrosion resisting steel wire rods for steel strands and its production method |
| CN109554631B (en) * | 2017-09-26 | 2021-08-17 | 宝山钢铁股份有限公司 | Low alloy steel and high-strength high-plasticity wire rod prepared from same and used for processing steel wire |
| CN109554631A (en) * | 2017-09-26 | 2019-04-02 | 宝山钢铁股份有限公司 | A kind of low-alloy steel and steel wire prepared therefrom processing High-strength high-plasticity wire rod |
| CN107747059A (en) * | 2017-11-30 | 2018-03-02 | 攀钢集团攀枝花钢铁研究院有限公司 | Steel wire rod and its production method are built containing V, Ti, Cr microalloy |
| CN108796166A (en) * | 2018-04-25 | 2018-11-13 | 马钢(集团)控股有限公司 | A kind of high strength steel and snap ring manufacturing method |
| CN110747394A (en) * | 2019-10-08 | 2020-02-04 | 鞍钢股份有限公司 | Wire rod for 2000MPa grade high-strength galvanized steel wire and production method thereof |
| CN111979475A (en) * | 2020-06-05 | 2020-11-24 | 包头钢铁（集团）有限责任公司 | Wire rod for ultrahigh-strength steel strand and preparation method thereof |
| CN112176258A (en) * | 2020-09-30 | 2021-01-05 | 江苏省沙钢钢铁研究院有限公司 | Wire rod for 2500 MPa-grade steel strand and manufacturing method thereof |
| CN113355595A (en) * | 2021-05-19 | 2021-09-07 | 天津荣程联合钢铁集团有限公司 | Large-size high-strength prestressed steel, preparation process and application thereof |
| CN113355595B (en) * | 2021-05-19 | 2022-05-24 | 天津荣程联合钢铁集团有限公司 | Large-size high-strength prestressed steel, preparation process and application thereof |
| CN115261735A (en) * | 2022-09-27 | 2022-11-01 | 联峰钢铁（张家港）有限公司 | Wire rod for prestressed steel strand and production process thereof |
| CN115261735B (en) * | 2022-09-27 | 2022-12-06 | 联峰钢铁（张家港）有限公司 | Wire rod for prestressed steel strand and production process thereof |
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Application publication date: 20130529 |