CN116770172A - Bridge steel with excellent corrosion resistance and production method thereof - Google Patents
Bridge steel with excellent corrosion resistance and production method thereof Download PDFInfo
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- CN116770172A CN116770172A CN202310616937.0A CN202310616937A CN116770172A CN 116770172 A CN116770172 A CN 116770172A CN 202310616937 A CN202310616937 A CN 202310616937A CN 116770172 A CN116770172 A CN 116770172A
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- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 57
- 239000010959 steel Substances 0.000 title claims abstract description 57
- 230000007797 corrosion Effects 0.000 title claims abstract description 25
- 238000005260 corrosion Methods 0.000 title claims abstract description 25
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 8
- 239000000126 substance Substances 0.000 claims abstract description 10
- 230000008595 infiltration Effects 0.000 claims abstract description 7
- 238000001764 infiltration Methods 0.000 claims abstract description 7
- 230000000737 periodic effect Effects 0.000 claims abstract description 6
- 230000004580 weight loss Effects 0.000 claims abstract description 6
- 239000012535 impurity Substances 0.000 claims abstract description 3
- 238000005096 rolling process Methods 0.000 claims description 37
- 238000001816 cooling Methods 0.000 claims description 23
- XEEYBQQBJWHFJM-UHFFFAOYSA-N iron Substances [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 20
- 238000009749 continuous casting Methods 0.000 claims description 9
- 229910052742 iron Inorganic materials 0.000 claims description 9
- 238000000034 method Methods 0.000 claims description 9
- 238000010438 heat treatment Methods 0.000 claims description 8
- 238000007670 refining Methods 0.000 claims description 7
- 238000011282 treatment Methods 0.000 claims description 7
- 238000006477 desulfuration reaction Methods 0.000 claims description 6
- 230000023556 desulfurization Effects 0.000 claims description 6
- 238000001514 detection method Methods 0.000 claims description 6
- 230000009467 reduction Effects 0.000 claims description 6
- 230000008569 process Effects 0.000 claims description 5
- 238000003723 Smelting Methods 0.000 claims description 3
- 239000002994 raw material Substances 0.000 claims description 2
- 230000000052 comparative effect Effects 0.000 description 12
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 description 8
- 238000007664 blowing Methods 0.000 description 5
- 239000000203 mixture Substances 0.000 description 5
- 229910052786 argon Inorganic materials 0.000 description 4
- 238000009489 vacuum treatment Methods 0.000 description 4
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 229910001562 pearlite Inorganic materials 0.000 description 2
- 229910000859 α-Fe Inorganic materials 0.000 description 2
- 238000005452 bending Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000005204 segregation Methods 0.000 description 1
- 238000007711 solidification Methods 0.000 description 1
- 230000008023 solidification Effects 0.000 description 1
- 238000003756 stirring Methods 0.000 description 1
Abstract
The application discloses bridge steel with excellent corrosion resistance and a production method thereof, wherein the bridge steel comprises the following chemical components in percentage by mass: c: 0.075-0.080%, si:0.27 to 0.32 percent of Mn:1.30 to 1.35 percent, P is less than or equal to 0.012 percent, S is less than or equal to 0.005 percent, nb: 0.026-0.030%, cr: 0.45-0.50%, ni:0.35 to 0.40 percent of Cu:0.25 to 0.30% Als:0.015 to 0.025 percent, and the balance of Fe and unavoidable impurities; the corrosion weight loss rate of the bridge steel disclosed by the application in 72 hours in a periodic infiltration test is 1.50g/m 2 And (3) the corrosion resistance is excellent below/h.
Description
Technical Field
The application belongs to the field of production and application of weather-resistant steel, in particular relates to bridge steel with excellent corrosion resistance and a production method thereof, and especially relates to Q355qENH weather-resistant bridge steel with excellent corrosion resistance.
Background
Along with the development of modern bridges, the safety and reliability of bridge structures are also becoming more and more strict. This not only poses a great challenge to bridge designers, but also places higher demands on bridge steels, not only to have high strength to meet structural lightweight requirements, but also to have excellent low temperature toughness, weldability, corrosion resistance and fatigue properties. The inventors of the present application have developed a Q345qENH high-performance weather-resistant bridge steel (patent document CN115074620a, hereinafter referred to as document 1) which has excellent comprehensive mechanical properties. However, this document 1 does not disclose the corrosion resistance of the bridge steel.
Disclosure of Invention
Aiming at the problems in the prior art, the application provides bridge steel with excellent corrosion resistance, which comprises the following chemical components in percentage by mass: c: 0.075-0.080 percent, si 0.27-0.32 percent, mn:1.30 to 1.35 percent, P is less than or equal to 0.012 percent, S is less than or equal to 0.005 percent, nb: 0.026-0.030%, cr: 0.45-0.50%, ni:0.35 to 0.40 percent of Cu:0.25 to 0.30 percent, als:0.015 to 0.025 percent, and the balance of Fe and unavoidable impurities;
the corrosion weight loss rate of the bridge steel in 72 hours in a periodic infiltration test is 1.50g/m 2 And/h or less;
the production method of the bridge steel comprises the following steps: adopting molten iron and scrap steel subjected to desulfurization pretreatment as raw materials, and obtaining the bridge steel through the working procedures of converter smelting, LF refining, RH treatment, continuous casting, heating, controlled rolling and controlled cooling; wherein:
the chemical component C is obtained through converter smelting, LF refining and RH treatment: 0.075-0.080 percent, si 0.27-0.32 percent, mn:1.30 to 1.35 percent, P is less than or equal to 0.012 percent, S is less than or equal to 0.005 percent, nb: 0.026-0.030%, cr: 0.45-0.50%, ni:0.35 to 0.40 percent of Cu:0.25 to 0.30 percent, als:0.015 to 0.025 percent of pure molten steel;
in the continuous casting process, adopting a dynamic soft reduction, electromagnetic stirring and optimized dynamic secondary cooling technology at the solidification tail end, and reducing the defects of center segregation, center porosity, cracks, vibration marks and the like of a continuous casting blank through a constant temperature and constant pulling speed process, so as to finally produce a high-quality continuous casting slab with the thickness of 250 mm;
in the heating process, the heating temperature is controlled to be 1210-1230 ℃, and the heating time is controlled to be 220-250 min;
in the controlled rolling process, the deformation of rough rolling passes is increased during rolling, the initial rolling temperature is 1160-1200 ℃, the relative rolling reduction of single pass is controlled to be more than 14% at least two passes, the deformation of each pass is strictly controlled during finish rolling, the initial rolling temperature of finish rolling is less than or equal to 920 ℃, and the final rolling temperature is 800-810 ℃;
in the cooling control process, the cooling speed is controlled to be 5-6 ℃/s, the final cooling temperature is controlled to be 630-640 ℃, and the bridge steel is obtained after finishing and flaw detection after cooling.
In some embodiments, the mechanical properties of the bridge steel satisfy: the yield strength is more than or equal to 447MPa, the tensile strength is more than or equal to 538MPa, and the elongation is more than or equal to 24.5%.
The application has the advantages that: the application provides bridge steel with excellent corrosion resistance, which can further improve the corrosion resistance of the steel on the premise of ensuring or further optimizing the strength performance of the steel by optimally controlling the chemical component content and the production process condition in the steel. The corrosion weight loss rate of the bridge steel with excellent corrosion resistance provided by the application in 72 hours in a periodic infiltration test is 1.50g/m 2 At most/h, the corrosion loss of the bridge steel disclosed in the above-mentioned document 1 is significantly lowerThe weight ratio, so the bridge steel is more suitable for more severe environments.
Drawings
FIG. 1 is a photograph showing a metallographic structure at 200 times the 1/4 thickness of the bridge steel produced in example 2, which shows a ferrite+pearlite structure having fine and uniform grains.
Detailed Description
The following describes the application in detail by way of specific examples, which are intended to aid in understanding the application and are not intended to limit the application.
Example 1:
the raw molten iron is subjected to deep desulfurization of molten iron, converter top-bottom converting, ladle argon blowing, LF external refining, RH vacuum treatment and continuous casting to obtain a 250mm thick slab with chemical compositions (weight percentage) shown in Table 1. The slab is heated at 1220 ℃ for 220min, the initial rolling temperature of the first stage is 1180 ℃, the single-pass relative rolling reduction rate is controlled to be 15% in at least two passes, when the thickness of a rolled piece is 56mm, the rolled piece is heated to 910 ℃ on a roller way, then the second stage rolling is carried out, the final rolling temperature is 800 ℃, and the thickness of a finished steel plate is 14mm. After the rolling is finished, the steel plate enters an accelerated cooling (ACC) device and is cooled to 640 ℃ at a speed of 5 ℃/s, and a cooling bed is cooled after hot straightening. And then carrying out online flaw detection and finishing treatment, and finally obtaining the steel plate.
Example 2
The raw molten iron is subjected to deep desulfurization of molten iron, converter top-bottom converting, ladle argon blowing, LF external refining, RH vacuum treatment and continuous casting to obtain a 250mm thick slab with chemical compositions (weight percentage) shown in Table 1. The slab is heated at 1230 ℃ for 230min, the initial rolling temperature of the first stage rolling is 1190 ℃, the relative rolling reduction rate of a single pass is controlled to be 15% in at least two passes, the thickness of a rolled piece is 120mm, the rolled piece is heated to 900 ℃ on a roller way, then the second stage rolling is carried out, the final rolling temperature is 810 ℃, and the thickness of a finished steel plate is 30mm. The cooling rate of the steel plate is 6 ℃/s and the final cooling temperature is 630 ℃. Cooling the cooling bed after hot straightening. And then flaw detection and finishing treatment are carried out, and finally, the steel plate can be obtained, and a metallographic structure photo of the steel plate at the 1/4 thickness of 200 times is shown as a picture 1, so that the steel plate can be a ferrite+pearlite structure with fine and uniform grains.
Example 3
The raw molten iron is subjected to deep desulfurization of molten iron, converter top-bottom converting, ladle argon blowing, LF external refining, RH vacuum treatment and continuous casting to obtain a 250mm thick slab with chemical compositions (weight percentage) shown in Table 1. The slab is heated to 1210 ℃ for 250min, the initial rolling temperature of the first stage rolling is 1180 ℃, the relative rolling reduction rate of a single pass is controlled to be 15% in at least two passes, the thickness of a rolled piece is 125mm, the rolled piece is heated to 890 ℃ on a roller way, the second stage rolling is carried out, the final rolling temperature is 800 ℃, and the thickness of a finished steel plate is 50mm. The cooling speed of the steel plate is 5 ℃/s, and the final cooling temperature is 640 ℃. Cooling the cooling bed after hot straightening. And then flaw detection and finishing treatment are carried out, and finally the steel plate can be obtained.
Comparative example 1
This comparative example was carried out in accordance with the procedure of example 1, except that: the chemical compositions of the 250mm thick slabs obtained by the processes of deep desulfurization of molten iron, top-bottom blowing of a converter, argon blowing of a ladle, external refining of an LF furnace, RH vacuum treatment and continuous casting are different, and are shown in the following table 1.
Comparative example 2
This comparative example was carried out in accordance with the procedure of example 3, except that: the final rolling temperature is 790 ℃, after rolling, the steel plate enters an accelerated cooling (ACC) device and is cooled to 650 ℃ at the speed of 8 ℃/s, and after hot straightening, the steel plate is cooled by a cooling bed. And then carrying out online flaw detection and finishing treatment, and finally obtaining the steel plate.
Table 1: examples 1-3 and comparative examples 1-2 chemical composition (mass percent)
| Examples | C | Si | Mn | P | S | Nb | Cr | Ni | Cu | Als |
| Example 1 | 0.075 | 0.30 | 1.35 | 0.009 | 0.001 | 0.026 | 0.48 | 0.38 | 0.30 | 0.020 |
| Example 2 | 0.077 | 0.27 | 1.30 | 0.010 | 0.002 | 0.030 | 0.45 | 0.40 | 0.28 | 0.015 |
| Example 3 | 0.080 | 0.32 | 1.32 | 0.009 | 0.001 | 0.028 | 0.50 | 0.35 | 0.25 | 0.025 |
| Comparative example 1 | 0.078 | 0.25 | 1.28 | 0.009 | 0.002 | 0.028 | 0.44 | 0.35 | 0.28 | 0.023 |
| Comparative example 2 | 0.075 | 0.30 | 1.35 | 0.009 | 0.001 | 0.026 | 0.48 | 0.38 | 0.30 | 0.020 |
The steel sheets of examples 1-3 and comparative examples 1-2 were examined for conventional mechanical properties, impact properties, and bending properties, and the results are shown in Table 2 below.
Table 2: mechanical Properties of the Steel sheets of examples 1-3 and comparative examples 1-2
The steel sheets of examples 1 to 3 and comparative examples 1 to 2 were examined for atmospheric corrosion resistance, and the results are shown in Table 3 below. The corrosion resistance of the test sample is measured by a periodic infiltration test, and the test is carried out in a Fl-65 type dry-wet periodic infiltration corrosion tester and adopts the TB/T2375-1993 standard. As can be seen, the bridge steels produced in examples 1-3 all have a corrosion weight loss rate of 1.50g/m in a period infiltration test for 72 hours 2 And the corrosion weight loss rate of the steel plates produced in the comparative examples 1-2 is obviously lower than that of the steel plates below/h, which shows that the bridge steel produced in the examples 1-3 has excellent corrosion resistance.
Table 3: corrosion resistance of the Steel sheets produced in examples and comparative examples
Finally, it should be noted that: the foregoing description is only a preferred embodiment of the present application, and is not intended to limit the present application, but although the present application has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that modifications may be made to the technical solutions described in the foregoing embodiments, or that equivalents may be substituted for part of the technical features thereof. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application should be included in the protection scope of the present application.
Claims (2)
1. The bridge steel with excellent corrosion resistance is characterized by comprising the following chemical components in percentage by mass: c: 0.075-0.080%, si:0.27 to 0.32 percent of Mn:1.30 to 1.35 percent, P is less than or equal to 0.012 percent, S is less than or equal to 0.005 percent, nb: 0.026-0.030%, cr: 0.45-0.50%, ni:0.35 to 0.40 percent of Cu:0.25 to 0.30 percent, als:0.015 to 0.025 percent, and the balance of Fe and unavoidable impurities;
the corrosion weight loss rate of the bridge steel in 72 hours in a periodic infiltration test is 1.50g/m 2 And/h or less;
the production method of the bridge steel comprises the following steps: adopting molten iron and scrap steel subjected to desulfurization pretreatment as raw materials, and obtaining the bridge steel through the working procedures of converter smelting, LF refining, RH treatment, continuous casting, heating, controlled rolling and controlled cooling; wherein:
in the heating process, the heating temperature is controlled to be 1210-1230 ℃, and the heating time is controlled to be 220-250 min;
in the controlled rolling process, the deformation of rough rolling passes is increased during rolling, the initial rolling temperature is 1160-1200 ℃, the relative rolling reduction of single pass is controlled to be more than 14% at least two passes, the deformation of each pass is strictly controlled during finish rolling, the initial rolling temperature of finish rolling is less than or equal to 920 ℃, and the final rolling temperature is 800-810 ℃;
in the cooling control process, the cooling speed is controlled to be 5-6 ℃/s, the final cooling temperature is controlled to be 630-640 ℃, and the bridge steel is obtained after finishing and flaw detection after cooling.
2. The bridge steel according to claim 1, characterized in that the mechanical properties of the bridge steel satisfy: the yield strength is more than or equal to 447MPa, the tensile strength is more than or equal to 538MPa, and the elongation is more than or equal to 24.5%.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202310616937.0A CN116770172A (en) | 2023-05-29 | 2023-05-29 | Bridge steel with excellent corrosion resistance and production method thereof |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202310616937.0A CN116770172A (en) | 2023-05-29 | 2023-05-29 | Bridge steel with excellent corrosion resistance and production method thereof |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103911558A (en) * | 2014-03-04 | 2014-07-09 | 宝钢集团新疆八一钢铁有限公司 | Production method for wear-resistant low temperature-resistant weather-resistant steel |
| CN108239722A (en) * | 2018-03-02 | 2018-07-03 | 山东钢铁股份有限公司 | The Weather-resistance bridge steel plate and its production method of a kind of yield strength >=420MPa |
| CN113444973A (en) * | 2021-06-30 | 2021-09-28 | 重庆钢铁股份有限公司 | Q420qENH heat-treatment-free steel plate for bridge and 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 |
| CN115074620A (en) * | 2022-05-18 | 2022-09-20 | 包头钢铁（集团）有限责任公司 | Q345qENH high-performance weather-proof bridge steel and production method thereof |
-
2023
- 2023-05-29 CN CN202310616937.0A patent/CN116770172A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103911558A (en) * | 2014-03-04 | 2014-07-09 | 宝钢集团新疆八一钢铁有限公司 | Production method for wear-resistant low temperature-resistant weather-resistant steel |
| CN108239722A (en) * | 2018-03-02 | 2018-07-03 | 山东钢铁股份有限公司 | The Weather-resistance bridge steel plate and its production method of a kind of yield strength >=420MPa |
| 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 |
| CN113444973A (en) * | 2021-06-30 | 2021-09-28 | 重庆钢铁股份有限公司 | Q420qENH heat-treatment-free steel plate for bridge and manufacturing method thereof |
| CN115074620A (en) * | 2022-05-18 | 2022-09-20 | 包头钢铁（集团）有限责任公司 | Q345qENH high-performance weather-proof bridge steel and production method thereof |
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