CN102321843B - Galvanized steel for communication tower and production method thereof - Google Patents
Galvanized steel for communication tower and production method thereof Download PDFInfo
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- CN102321843B CN102321843B CN 201110282790 CN201110282790A CN102321843B CN 102321843 B CN102321843 B CN 102321843B CN 201110282790 CN201110282790 CN 201110282790 CN 201110282790 A CN201110282790 A CN 201110282790A CN 102321843 B CN102321843 B CN 102321843B
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Abstract
The invention relates to galvanized steel for communication towers and a production method thereof. The galvanized steel for communication towers comprises the following chemical components by weight: 0.04-0.08% of C, 0.01-0.06% of Si, 0.60-1.20% of Mn, <0.010% of P, <0.008% of S, 0.01-0.04% of V, 0.03-0.12% of Ti, >0.02% of Alt, and the balance of Fe. The production method comprises the following steps: performing KR desulphurization pretreatment and complete pretreatment converter smelting of molten iron, performing LF furnace refining, and obtaining a casting blank by a continuous caster; heating the casting blank, passing through a sizing press machine, performing rough rolling and finish rolling, performing laminar cooling of the steel plate, and finally rolling up the steel plate. By reasonable components and process design of the invention, based on the satisfaction of different strength grade requirements, the production cost is reduced, and the galvanizability and weldability of the steel for communication towers are improved.
Description
Technical field
The present invention relates to technical field of steel rolling, be specifically related to a kind of galvanized steel for communication tower and production method thereof.
Background technology
In recent years, high speed development along with domestic mobile communication and network communication, mobile phone and the network user sharply increase, and people are also more and more higher to the demand on signal quality of mobile phone and network communication, especially in some remote mountain areas and the abominable area of environment, it is particularly outstanding that the quality problems of communication signals seem.Address this problem, the most direct method is exactly to set up abundant communication pylon in these areas, and this is so that the construction of China's communication pylon has had unprecedented development, and the communication pylon is also increasing year by year with the demand of steel.South China some areas had suffered serious snow disaster in 2008, and a lot of collapse accidents have occured the communication pylon, and the communication of this area also has been subject to having a strong impact on thus, and this just requires the communications tower frame to want the higher category development with steel.In addition, build the communication pylon at extreme environments such as freezing, seawater, also will consider the low-temperature flexibility of material and erosion resistance etc.Given this, the communication pylon has escalated into instant problem with the over-all properties of steel.
At present, both at home and abroad the communication pylon adopts Nb, V complex intensifying mostly with steel, and C, Si in this steel, Mn content are higher.The C of high level can worsen the welding property of sheet material; Higher Si content can make and form a large amount of Fe in the heating steel billet process between ferric oxide cortex and matrix
2SiO
4, namely strengthened the pressure of follow-up dephosphorization operation, the surface quality of steel plate is descended, thereby have influence on follow-up galvanizing process, cause the plating leakage phenomenon; Higher Mn content easily causes the strand segregation and causes Laminated steel.These all are the problems that galvanized steel for communication tower need to solve.In addition, the requirement with steel also is not quite similar to the communication pylon in different areas, so zinc-plated pylon should be gradually towards height reinforcement, easily weldingization, the producing in serial form of the easily future development of coating, and realization with steel.
Summary of the invention
The object of the present invention is to provide a kind of galvanized steel for communication tower, can satisfy the requirement of varying strength rank.
Another object of the present invention is to provide a kind of production method of galvanized steel for communication tower, on the basis of satisfying the requirement of varying strength rank, reduce production costs, improve zinc-plated property and the weldability of this kind steel.
In order to achieve the above object, the technical solution used in the present invention is:
A kind of galvanized steel for communication tower comprises the chemical composition of following weight percent,
C:0.06 ~ 0.08wt%, Si:0.01 ~ 0.04wt%, Mn:0.90 ~ 1.20wt%, P:＜0.010wt%, S:＜0.008wt%, V:0.01 ~ 0.02wt%, Ti:0.06 ~ 0.08wt%, Alt:〉0.02wt%, surplus is Fe.
A kind of production method of galvanized steel for communication tower, described production method comprises smelting, rolling, specifically comprises the steps:
(1) molten iron is taken off converter smelting by KR desulfurization pre-treatment and complete three, adopt again the refining of LF stove, then utilize continuous caster to obtain needed strand;
The weight percent of the chemical composition of described strand is: C 0.06 ~ 0.08wt%, Si 0.01 ~ 0.04wt%, Mn 0.90 ~ 1.20wt%, P＜0.010wt%, S＜0.008wt%, V 0.01 ~ 0.02wt%, Ti 0.06 ~ 0.08wt%, Alt〉0.02wt%, surplus is Fe;
(2) first with the strand heating, pass through again fixed-width pressure machine, roughing, finish rolling, obtain the steel plate of required size; Then steel plate is cooled off through laminar flow, at last with the steel plate rolling.
In the such scheme, the condition of strand heating is in the described step (2), and Heating temperature is 1200 ~ 1260 ℃, and be 3.0 ~ 5.0 hours heat-up time.
In the such scheme, roughing is respectively through two rollers and four roller roughing with strand in the described step (2).
In the such scheme, between roughing and the finish rolling, steel billet is enabled stay-warm case in the described step (2).
In the such scheme, the finishing temperature in the described step (2) is 820 ~ 860 ℃, and coiling temperature is 560 ~ 640 ℃.
Compare with the prior art scheme, the beneficial effect that the technical solution used in the present invention produces is as follows:
The present invention is by reasonable component and technological design, satisfying on the basis that the varying strength rank requires, reduces production costs, and improves the communication pylon with zinc-plated property and the weldability of steel, satisfies the demand of the long distance of transmitting line, large capacity development.
Description of drawings
Fig. 1 is the production method process flow sheet of galvanized steel for communication tower provided by the invention.
Fig. 2 is the figure of typical organization of galvanized steel for communication tower in the embodiment of the invention;
Fig. 3 is the figure of typical organization of galvanized steel for communication tower in another embodiment of the present invention;
Fig. 4 is the figure of typical organization of galvanized steel for communication tower in another embodiment of the present invention.
Embodiment
Below in conjunction with drawings and Examples technical solution of the present invention is described in detail.
The invention provides a kind of galvanized steel for communication tower, comprise the chemical composition of following weight percent,
C:0.06 ~ 0.08wt%, Si:0.01 ~ 0.04wt%, Mn:0.90 ~ 1.20wt%, P:＜0.010wt%, S:＜0.008wt%, V:0.01 ~ 0.02wt%, Ti:0.06 ~ 0.08wt%, Alt:〉0.02wt%, surplus is Fe.
The present invention adopts low C, Si, Mn Composition Design, improves the weldability of steel plate, improves plate surface quality, alleviates the strand segregation; Replace Nb of the prior art with Ti, separate out in utilization, refined crystalline strengthening improves in the armor plate strength, reduce production costs; For satisfying the specific demand of different user, by the content of fine setting Mn and Ti, can obtain zinc-plated communication pylon series (SQ345DX, SQ420DX, SQ460DX) in conjunction with different rolling technologys and use steel.
As shown in Figure 1, the invention provides a kind of production method of galvanized steel for communication tower, comprise smelting and rolling, concrete steps are as follows:
(1) molten iron is taken off sulphur and the phosphorus harmful element that converter smelting process is controlled molten steel by KR desulfurization pre-treatment and complete three, adopt LF stove refining treatment that the chemical composition of molten steel is accurately controlled, then utilize continuous caster to obtain needed strand.
Above-mentioned strand composition is C 0.06 ~ 0.08wt%, Si 0.01 ~ 0.04wt%, Mn 0.90 ~ 1.20wt%, P＜0.010wt%, S＜0.008wt%, V 0.01 ~ 0.02wt%, Ti 0.06 ~ 0.08wt%, Alt〉0.02wt%, surplus is Fe.
(2) strand is heated to 1200 ~ 1260 ℃ first, be 3.0 ~ 5.0 hours heat-up time; Through fixed-width pressure machine, obtain needed strand width; Again respectively through two rollers and four roller roughing, through finishing train, obtain the steel plate of required size.Between roughing and finish rolling, enable stay-warm case, prevent that the intermediate blank temperature from reducing too fast.Then through the laminar flow cooling, obtain needed tissue and performance; Utilize at last reeling machine with the steel plate rolling.Strict control finishing temperature and coiling temperature guarantee that finishing temperature is 820 ~ 860 ℃ in the course of hot rolling, and coiling temperature is 560 ~ 640 ℃.
The present invention adopts the process thought of low-temperature heat, low temperature rolling, high temperature coiling, and the effect of consumption reduction synergy is played in low-temperature heat, provides safeguard for the low temperature rolling in finish rolling stage on the other hand.The finish rolling stage owing to containing the V of higher Ti and trace, increases the deflection of non-recrystallization zone, increases the distortional strain energy in the former body crystal grain difficult to understand, thereby increases ferritic nucleation rate in the phase transition process, reaches crystal grain thinning and puies forward high-intensity purpose.Adopt sparse cooling mode, improve coiling temperature, be conducive to improve the TiC precipitating reinforcing effect, thereby obtain low-cost and easy-to welding, zinc-plated communication pylon series steel.
Embodiment 1
With molten iron through the KR desulfurization process, complete three take off converter, LF stove refining processing after, carry out continuous casting; Its slab smelting component is: C 0.07wt%, Si 0.03wt%, Mn 0.9wt%, P 0.008wt%, S 0.006wt%, V 0.015wt%, Ti 0.06wt%, Alt 0.030wt%, surplus is Fe.
1200 ℃ of slab heating temperatures, 3.0 hours heat-up times, 840 ℃ of finishing temperatures, 600 ℃ of coiling temperatures; After heating, roughing, finish rolling, laminar flow cooling, batch, obtaining at last model is SQ345DX communication pylon steel, its yield strength 375MPa, tensile strength 450MPa, unit elongation 47.0%,-20 ℃ of ballistic work 185J, width are that 1800mm, thickness are 7.8mm.It is organized as typical ferrite+pearlitic structure, as shown in Figure 2.
Embodiment 2
With molten iron through the KR desulfurization process, complete three take off converter, LF stove refining processing after, carry out continuous casting; Its slab smelting component is: C 0.07wt%, Si 0.03wt%, Mn 1.0wt%, P 0.008wt%, S 0.006wt%, V 0.016wt%, Ti 0.08wt%, Alt 0.036wt%, surplus is Fe.
1200 ℃ of slab heating temperatures, 3.0 hours heat-up times, 830 ℃ of finishing temperatures, 600 ℃ of coiling temperatures; After heating, roughing, finish rolling, laminar flow cooling, batch, obtaining at last model is SQ420DX communication pylon steel, its yield strength 445MPa, tensile strength 530MPa, unit elongation 45.5%,-20 ℃ of ballistic work 180J, width are that 2011mm, thickness are 11.8mm.It is organized as typical ferrite+pearlitic structure, as shown in Figure 3.
Embodiment 3
With molten iron through the KR desulfurization process, complete three take off converter, LF stove refining processing after, carry out continuous casting; Its slab smelting component is: C 0.07wt%, Si 0.02wt%, Mn 1.2wt%, P 0.008wt%, S 0.005wt%, V 0.014wt%, Ti 0.08wt%, Alt 0.040wt%, surplus is Fe.
1200 ℃ of slab heating temperatures, 3.5 hours heat-up times, 840 ℃ of finishing temperatures, 620 ℃ of coiling temperatures; After heating, roughing, finish rolling, laminar flow cooling, batch.Obtaining at last model is SQ460DX communication pylon steel, its yield strength 490MPa, tensile strength 570MPa, 40.5% ,-20 ℃ of ballistic work 157J of unit elongation, and width is that 1315mm, thickness are 9.8mm.It is organized as polygonal ferrite+acicular ferrite+a small amount of perlite, as shown in Figure 4.
The present invention is by reasonable component and technological design, satisfying on the basis that the varying strength rank requires, reduces production costs, and improves communication pylon series with zinc-plated property and the weldability of steel, satisfies the demand of the long distance of transmitting line, large capacity development.
The above is the preferred embodiments of the present invention only, is not limited to the present invention, and for a person skilled in the art, the present invention can have various modifications and variations.Within the spirit and principles in the present invention all, any modification of doing, be equal to replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (3)
1. the production method of a galvanized steel for communication tower is characterized in that, described production method comprises smelting, rolling, specifically comprises the steps:
(1) molten iron is taken off converter smelting by KR desulfurization pre-treatment and complete three, adopt again the refining of LF stove, then utilize continuous caster to obtain needed strand;
The weight percent of the chemical composition of described strand is: C 0.06～0.08wt%, Si 0.01～0.04wt%, Mn 0.90～1.20wt%, P＜0.010wt%, S＜0.008wt%, V 0.01～0.02wt%, Ti0.06～0.08wt%, Alt〉0.02wt%, surplus is Fe;
(2) first with the strand heating, pass through again fixed-width pressure machine, roughing, finish rolling, obtain the steel plate of required size; Then steel plate is cooled off through laminar flow, at last with the steel plate rolling;
The condition of strand heating is in the described step (2), and Heating temperature is 1200～1260 ℃, and be 3.0～5.0 hours heat-up time; Finishing temperature in the described step (2) is 820～860 ℃, and coiling temperature is 560～640 ℃.
2. the production method of galvanized steel for communication tower as claimed in claim 1 is characterized in that, roughing is respectively through two rollers and four roller roughing with strand in the described step (2).
3. the production method of galvanized steel for communication tower as claimed in claim 1 is characterized in that, between roughing and the finish rolling, steel billet is enabled stay-warm case in the described step (2).
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Address after: 100041 Shijingshan Road, Beijing, No. 68, No. Patentee after: Shougang Group Co. Ltd. Address before: 100041 Shijingshan Road, Beijing, No. 68, No. Patentee before: Capital Iron & Steel General Company |
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