CN101838770A - High-strength steel for transmission towers and production method thereof - Google Patents
High-strength steel for transmission towers and production method thereof Download PDFInfo
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Abstract
The invention relates to high-strength steel for transmission towers and a production method thereof, and belongs to the field of metallurgy. The invention provides an Nb-V-Ti microalloy high-strength high-tenacity structural band steel and a production method thereof; and the invention has the advantages of simple hot rolling process control and low production cost. The high-strength steel for the transmission towers comprises the following chemical components in percentage by weight: less than or equal to 0.010% of C, 0.30-0.50% of Si, more than 1.40% and less than or equal to 1.60% of Mn, less than or equal to 0.015% of P, less than or equal to 0.010% of S, 0.015-0.030% of Nb, 0.04-0.08% of V, 0.006-0.02% of Ti, and the balance of Fe and inevitable impurities. The high-strength steel for the transmission towers can be used as welded tubes and connecting plates with high requirements on strength and tenacity in supervoltage transmission towers, and has the advantages of simple production method, low production cost and the like.
Description
Technical field
The present invention relates to high-strength steel for transmission towers and production method, belong to field of metallurgy.
Background technology
High-strength steel for transmission towers is combined into iron tower after being welded into steel pipe, in these are used, performance requriements to steel plate is: intensity must reach design loading, low-temperature flexibility is enough to prevent the brittle rupture in the structure, can guarantee to obtain to have the welding property of the zero defect welding joint of good mechanical performance simultaneously.Owing to the toughness and the weldability that generally can worsen sheet material by single alloy strengthening, so by suitable technological design, it is very necessary making over-all properties obtain largest optimization.Intensity and low-temperature flexibility mainly are that the feature by microstructure is determined.As ferrite-pearlite, these microstructure parameters of the tiny precipitated phase in ferrite grain size, pearlitic volume fraction and the ferrite crystal grain usually are used to describe tissue signature in simple microstructure.Be the welding property that obtains, it is very necessary adopting the design of low chemical ingredients and low-carbon-equivalent (Ceq), but low Ceq also can reduce intensity, therefore, should add alloying elements such as Nb, V, Ti, to strive for that improving intensity does not lose welding property again.
Table 1 is a 460MPa level structure steel routine chemical components.
Table 1 chemical ingredients scope (weight percent)/%
| ??C | ??Si | ??Mn | ??P | ??S | ??Nb | ??V | ??Ti | ??Cr | ??Ni | ??Cu | ??N | ??Mo | ??B | ??Als |
| ??≤??0.20 | ??≤??0.60 | ??≤??1.80 | ??≤??0.025 | ??≤??0.020 | ??≤??0.11 | ??≤??0.20 | ??≤??0.20 | ??≤??0.30 | ??≤??0.80 | ??≤??0.55 | ??≤??0.015 | ??≤??0.20 | ??≤??0.004 | ??≤??0.015 |
Its alloy is many as seen from Table 1, the cost height.Application number is for having adopted the material of higher Mn, Nb, Mo, Cu, Ni, Cr content in the Chinese patent application " high-strength steel and manufacture method thereof with high welding heat influence area toughness " of " 200610048072.9 ", two sections rolling technologys of its rolling employing and roll postheat treatment technology, the production cost height, the technology controlling and process complexity.Other high tensile steel plate document that is used for electric power pylon does not appear in the newspapers at present.
Summary of the invention
First technical problem solved by the invention provides the Nb-V-Ti microalloy high-strength high tenacity structure band steel that a kind of hot rolling technology control is simple, production cost is low.
High-strength steel for transmission towers of the present invention, its chemical component weight per-cent is: C :≤0.010%, Si:0.30%～0.50%, Mn:1.40%～1.60%, P :≤0.015%, S :≤0.010%, Nb:0.015%～0.030%, V:0.04%～0.08%, Ti:0.006%～0.02%, all the other are Fe and unavoidable impurities.
Wherein, above-mentioned high-strength steel for transmission towers yield strength 〉=460MPa.
Wherein, above-mentioned high-strength steel for transmission towers tensile strength 〉=550MPa.
Wherein, above-mentioned high-strength steel for transmission towers unit elongation 〉=18%.
Wherein, the ballistic work 〉=34J during above-mentioned high-strength steel for transmission towers-40 ℃.
Further, above-mentioned high-strength steel for transmission towers is prepared from by following method, this method comprises heating, hot rolling, laminar flow cooling, batches step, wherein, temperature in the heating steps is 1200 ℃～1250 ℃, finishing temperature in the hot-rolled step is 900 ℃～940 ℃, and the temperature of batching in the step is 630 ℃～670 ℃.
Second technical problem solved by the invention provides a kind of preparation method of above-mentioned high-strength steel for transmission towers.
The preparation method of high-strength steel for transmission towers of the present invention, its production stage and existing hot rolled strip processing step are basic identical, comprise heating, hot rolling, laminar flow cooling, batch step, wherein, temperature in the heating steps is 1200 ℃～1250 ℃, finishing temperature in the hot-rolled step is 900 ℃～940 ℃, and the temperature of batching in the step is 630 ℃～670 ℃.
Further, the aforesaid method step is: behind the heating steel billet to 1200 ℃～1250 ℃, become intermediate blank through the roughing mill roughing; Enter finishing train behind the intermediate billet temperature retaining, be rolled into coil of strip, 900 ℃～940 ℃ of finishing temperatures; Enter reeling machine then and batch to such an extent that be with steel after the laminar flow cooling, laminar flow cooling back and the temperature of batching in the step are 630 ℃～670 ℃.
In the heating phase, in order to obtain high austenite solid solution Nb content and tiny austenite crystal, the temperature in the described heating steps is 1200 ℃～1250 ℃.
Finishing temperature in the described hot-rolled step is 900 ℃～940 ℃, is favourable to reducing yield tensile ratio and reducing rolling load.
When coiling temperature is lower than 630 ℃ of left and right sides, be easy to generate abnormal structures such as bainite, and the carbonitride of niobium (vanadium) is separated out difficulty.Therefore, the temperature of batching in the step is 630 ℃～670 ℃.
The invention has the beneficial effects as follows: by niobium, vanadium, titanium content and the hot rolling technology in the control steel, make high-strength steel for transmission towers have excellent comprehensive performances such as intensity height, good toughness, good welding performance, and have that hot rolling technology control difficulty is little, workable, method simple, low cost and other advantages.
Embodiment
The invention will be further described below in conjunction with example.
The inventive method can adopt the hot rolling unit to produce the high-strength high-toughness low alloy structural strip steel.Can become intermediate blank through two reversing rougher roughing with behind the heating steel billet to 1200 ℃～1250 ℃, after the Coil Box insulation, enter six frame finishing train, the coil of strip that is rolled into, 900 ℃～940 ℃ of finishing temperatures again.Enter reeling machine then and batch to such an extent that be with steel after the laminar flow cooling, the temperature of batching in the step is 630 ℃～670 ℃.Can adopt unit commonly used and equipment that the steel billet of various above-mentioned steel grades is rolled the coil of strip that needs to produce in the actual production, but topmost control is that 3 temperature in the key step are within above-mentioned scope.
The production and the performance measurement of example one high-strength steel for transmission towers of the present invention
Adopt 1450 hot rolling units (6 frame finishing mill) to produce high-strength steel for transmission towers, the chemical component weight per-cent of steel billet is: C:0.07%, Si:0.35%, Mn:1.50%, P:0.013%, S:0.008%, Nb:0.015%, V:0.05%, Ti:0.010%, all the other are Fe and unavoidable impurities.
Its production process is: steel billet → hot rolling → laminar flow cools off → batches.Steel billet 200mm * 1150mm * 11000mm is after 1223 ℃ of heating, become 35mm (thick) * 1150mm (wide) * Cmm (thick * wide * long through the 6 passage roughing of two reversing roughers, the length of the coil of strip of producing is represented with C, intermediate blank afterwards together), after the Coil Box insulation, enter six frame finishing train again, be rolled into the coil of strip of 6.0mm * 1150mm * Cmm, finishing temperature is 905 ℃.Enter reeling machine and batch to such an extent that be with steel after the laminar flow cooling, the temperature of batching in the step is 648 ℃.Production obtains the high-strength high-toughness low alloy structural strip steel that specification is 6.0mm (thick) * 1150mm (wide) * Cmm.
Its production process is: steel billet → hot rolling → laminar flow cools off → batches, and the temperature in its heating steps is that the finishing temperature in the hot-rolled step is that the temperature of batching in the step is 648 ℃.Production obtains electric power pylon and the high-strength steel that specification is 6.0mm (thick) * 1150mm (wide) * Cmm.
After measured, the performance of the high-strength steel for transmission towers of this examples produce is as follows: yield strength, tensile strength, unit elongation and low-temperature impact work (half-size scale.The standard size of ballistic work is 10mm * 10mm * 55mm, but when the little 10mm of steel plate thickness, stipulate the sample of available 7.5mm * 10mm * 55mm and 5.0mm * 10mm * 55mm, they are called 3/4 size and half-size scale respectively for short) be respectively 475MPa, 560MPa, 29%, 97J.
The measuring method of the yield strength in the example of the present invention, tensile strength, unit elongation and low-temperature impact work is all measured by national standard.Ballistic work can carry out above 3 kinds of methods respectively according to the thickness difference to be measured, and this also is a national Specification.This product thickness is 6.0mm, so processing sample is 5.0mm * 10mm * 55mm, to thicker band steel such as 11.6mm with 8.6mm equal thickness specification product will carry out 10mm * 10mm * 55mm and 7.5mm * 10mm * 55mm measures ballistic work.
The production and the performance measurement of example two high-strength steel for transmission towers of the present invention
Adopt 1450 hot rolling units to produce high-strength steel for transmission towers, the chemical component weight per-cent of steel billet is: C:0.07%, Si:0.37%, Mn:1.49%, P:0.015%, S:0.004%, Nb:0.025%, V:0.07%, Ti:0.011%, all the other are Fe and unavoidable impurities.
Its production process is: steel billet → hot rolling → laminar flow cools off → batches, and detailed process is referring to embodiment one.Temperature in its heating steps is 1228 ℃, and the finishing temperature in the hot-rolled step is 922 ℃, and the temperature of batching in the step is 649 ℃.Production obtains electric power pylon and the high-strength steel that specification is 6.0mm * 1150mm * Cmm.
After measured, the performance of the high-strength steel for transmission towers of this examples produce is as follows: yield strength, tensile strength, unit elongation and low-temperature impact work (half-size scale) are respectively 550MPa, 630MPa, 28%, 94J.
The production and the performance measurement of example three high-strength steel for transmission towers of the present invention
Adopt 1450 hot rolling units to produce high-strength steel for transmission towers, the chemical component weight per-cent of steel billet is: C:0.10%, Si:0.32%, Mn:1.42%, P:0.015%, S:0.007%, Nb:0.022%, V:0.07%, Ti:0.019%, all the other are Fe and unavoidable impurities.
Its production process is: steel billet → hot rolling → laminar flow cools off → batches, and detailed process is referring to embodiment one.Temperature in its heating steps is 1245 ℃, and the finishing temperature in the hot-rolled step is 938 ℃, and the temperature of batching in the step is 665 ℃.Production obtains electric power pylon and the high-strength steel that specification is 11.0mm * 1150mm * Cmm.
After measured, the performance of the high-strength steel for transmission towers of production is as follows: yield strength, tensile strength, unit elongation and low-temperature impact work (full-scale) are respectively 525MPa, 610MPa, 29%, 184J.
The production and the performance measurement of example four high-strength steel for transmission towers of the present invention
Adopt 1450 hot rolling units to produce high-strength steel for transmission towers, the chemical component weight per-cent of steel billet is: C:0.06%, Si:0.49%, Mn:1.60%, P:0.014%, S:0.008%, Nb:0.018%, V:0.07%, Ti:0.007%, all the other are Fe and unavoidable impurities.
Its production process is: steel billet → hot rolling → laminar flow cools off → batches, and detailed process is referring to embodiment one.Temperature in its heating steps is 1205 ℃, and the finishing temperature in the hot-rolled step is 908 ℃, and the temperature of batching in the step is 635 ℃.Production obtains electric power pylon and the high-strength steel that specification is 8.0mm * 1150mm * Cmm.
After measured, the performance of the high-strength steel for transmission towers of production is as follows: yield strength, tensile strength, unit elongation and low-temperature impact work (3/4 size) are respectively 505MPa, 595MPa, 30%, 144J.
When carbon content is not more than 0.12%, can adopt welding crack sensibility index (Pcm) to replace the weldability of carbon equivalent assessment steel.Pcm should and adopt following formula to calculate by the heat analysis composition, and its value≤0.20% is good.
Pcm＝C+Si/30+Mn/20+Cu/20+Ni/60+Cr/20+Mo/15+V/10+5B。
High-strength high-toughness low alloy structural strip steel Pcm of the present invention is about 0.16%, has good welding property.
Claims (7)
1. high-strength steel for transmission towers, it is characterized in that: its chemical component weight per-cent is: C :≤0.010%, Si:0.30%～0.50%, Mn:1.40%＜Mn≤1.60%, P :≤0.015%, S :≤0.010%, Nb:0.015%～0.030%, V:0.04%～0.08%, Ti:0.006%～0.02%, all the other are Fe and unavoidable impurities.
2. high-strength steel for transmission towers according to claim 1 is characterized in that: its yield strength 〉=460MPa.
3. high-strength steel for transmission towers according to claim 1 is characterized in that: its tensile strength 〉=550MPa.
4. high-strength steel for transmission towers according to claim 1 is characterized in that: its unit elongation 〉=18%.
5. high-strength steel for transmission towers according to claim 1 is characterized in that: the ballistic work 〉=34J in the time of its-40 ℃.
6. the production method of each described high-strength steel for transmission towers of claim 1～5, comprise heating, hot rolling, laminar flow cooling, batch step, it is characterized in that: the temperature in the heating steps is 1200 ℃～1250 ℃, finishing temperature in the hot-rolled step is 900 ℃～940 ℃, and the temperature of batching in the step is 630 ℃～670 ℃.
7. the production method of high-strength steel for transmission towers according to claim 6 is characterized in that may further comprise the steps: behind the heating steel billet to 1200 ℃～1250 ℃, become intermediate blank through the roughing mill roughing; Enter finishing train behind the intermediate billet temperature retaining, be rolled into coil of strip, 900 ℃～940 ℃ of finishing temperatures; Enter reeling machine then and batch to such an extent that be with steel after the laminar flow cooling, laminar flow cooling back and the temperature of batching in the step are 630 ℃～670 ℃.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105986211A (en) * | 2015-02-11 | 2016-10-05 | 国家电网公司 | Hot-dip galvanizing clad layer of steel member of electric transmission line and preparation method thereof |
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| CN101318287A (en) * | 2008-06-12 | 2008-12-10 | 首钢总公司 | Method for manufacturing 460Mpa high-toughness medium plate for bridge |
| CN101358320A (en) * | 2008-09-02 | 2009-02-04 | 首钢总公司 | Steel for controlled rolling and controlled cooling platform and production method thereof |
| CN101407892A (en) * | 2008-11-25 | 2009-04-15 | 武汉钢铁(集团)公司 | Ultra-low carbon hot rolling weathering steel with yield strength larger than 550MPa |
| CN101709426A (en) * | 2009-12-15 | 2010-05-19 | 武汉钢铁(集团)公司 | Economical weathering steel for transmission tower and preparation method thereof |
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Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101318287A (en) * | 2008-06-12 | 2008-12-10 | 首钢总公司 | Method for manufacturing 460Mpa high-toughness medium plate for bridge |
| CN101358320A (en) * | 2008-09-02 | 2009-02-04 | 首钢总公司 | Steel for controlled rolling and controlled cooling platform and production method thereof |
| CN101407892A (en) * | 2008-11-25 | 2009-04-15 | 武汉钢铁(集团)公司 | Ultra-low carbon hot rolling weathering steel with yield strength larger than 550MPa |
| CN101709426A (en) * | 2009-12-15 | 2010-05-19 | 武汉钢铁(集团)公司 | Economical weathering steel for transmission tower and preparation method thereof |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105986211A (en) * | 2015-02-11 | 2016-10-05 | 国家电网公司 | Hot-dip galvanizing clad layer of steel member of electric transmission line and preparation method thereof |
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Application publication date: 20100922 |