CN115786815B - Alkali-resistant environment corrosion-resistant pipeline steel hot rolled steel coil and preparation method thereof - Google Patents
Alkali-resistant environment corrosion-resistant pipeline steel hot rolled steel coil and preparation method thereof Download PDFInfo
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- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 67
- 239000010959 steel Substances 0.000 title claims abstract description 67
- 230000007797 corrosion Effects 0.000 title claims abstract description 34
- 238000005260 corrosion Methods 0.000 title claims abstract description 34
- 239000003513 alkali Substances 0.000 title claims abstract description 23
- 238000002360 preparation method Methods 0.000 title claims abstract description 10
- 238000005096 rolling process Methods 0.000 claims abstract description 43
- 238000000034 method Methods 0.000 claims abstract description 22
- 238000001816 cooling Methods 0.000 claims abstract description 20
- 238000010438 heat treatment Methods 0.000 claims abstract description 11
- 230000007613 environmental effect Effects 0.000 claims abstract description 8
- 229910052759 nickel Inorganic materials 0.000 claims abstract description 8
- 239000000126 substance Substances 0.000 claims abstract description 7
- 238000003723 Smelting Methods 0.000 claims abstract description 5
- 238000009749 continuous casting Methods 0.000 claims abstract description 5
- 239000012535 impurity Substances 0.000 claims abstract description 4
- 229910052782 aluminium Inorganic materials 0.000 claims abstract description 3
- 229910000859 α-Fe Inorganic materials 0.000 claims description 6
- 229910001563 bainite Inorganic materials 0.000 claims description 4
- 229910001568 polygonal ferrite Inorganic materials 0.000 claims description 4
- 238000005266 casting Methods 0.000 claims description 3
- 238000010079 rubber tapping Methods 0.000 claims description 3
- 238000002791 soaking Methods 0.000 claims description 3
- 238000005272 metallurgy Methods 0.000 abstract description 2
- 230000000052 comparative effect Effects 0.000 description 7
- 238000012360 testing method Methods 0.000 description 6
- 229910052802 copper Inorganic materials 0.000 description 5
- 239000002253 acid Substances 0.000 description 4
- 239000002131 composite material Substances 0.000 description 4
- 239000000956 alloy Substances 0.000 description 3
- 239000013078 crystal Substances 0.000 description 3
- 238000002474 experimental method Methods 0.000 description 3
- 230000000737 periodic effect Effects 0.000 description 3
- 230000004580 weight loss Effects 0.000 description 3
- 229910000599 Cr alloy Inorganic materials 0.000 description 2
- 229910001182 Mo alloy Inorganic materials 0.000 description 2
- 229910045601 alloy Inorganic materials 0.000 description 2
- 229910001566 austenite Inorganic materials 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 230000003628 erosive effect Effects 0.000 description 2
- 238000005098 hot rolling Methods 0.000 description 2
- 230000008595 infiltration Effects 0.000 description 2
- 238000001764 infiltration Methods 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 238000011160 research Methods 0.000 description 2
- 150000003839 salts Chemical class 0.000 description 2
- 239000013535 sea water Substances 0.000 description 2
- 239000002912 waste gas Substances 0.000 description 2
- 239000002351 wastewater Substances 0.000 description 2
- 229910000838 Al alloy Inorganic materials 0.000 description 1
- 229910000990 Ni alloy Inorganic materials 0.000 description 1
- 230000002411 adverse Effects 0.000 description 1
- 238000005452 bending Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 229910052804 chromium Inorganic materials 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 239000000835 fiber Substances 0.000 description 1
- 238000007654 immersion Methods 0.000 description 1
- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 description 1
- 238000002386 leaching Methods 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 239000007769 metal material Substances 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 229910052750 molybdenum Inorganic materials 0.000 description 1
- 230000007935 neutral effect Effects 0.000 description 1
- 238000010899 nucleation Methods 0.000 description 1
- 230000006911 nucleation Effects 0.000 description 1
- 238000005554 pickling Methods 0.000 description 1
- 230000001737 promoting effect Effects 0.000 description 1
- 238000001953 recrystallisation Methods 0.000 description 1
- 239000011347 resin Substances 0.000 description 1
- 229920005989 resin Polymers 0.000 description 1
- 239000007921 spray Substances 0.000 description 1
- 238000005728 strengthening Methods 0.000 description 1
- 239000004753 textile Substances 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/20—Recycling
Abstract
An alkali-resistant environment corrosion-resistant pipeline steel hot rolled steel coil and a preparation method thereof belong to the technical field of metallurgy. The chemical components and mass percent are as follows: c:0.05 to 0.07 percent, si is less than or equal to 0.1 percent, mn:1.0 to 1.5 percent, P is less than or equal to 0.012 percent, S is less than or equal to 0.002 percent, cu:0.1 to 0.4 percent of Ni:0.1 to 0.2 percent of Ti:0.01 to 0.02 percent of Al:0.02% -0.035%, and the balance of Fe and unavoidable impurities; the preparation method comprises the working procedures of smelting, continuous casting, heating, rolling, cooling and coiling; the reduction rate of the rough rolling in the rolling process and the last two passes is more than 25 percent; the initial rolling temperature of the finish rolling is 930-970 ℃, and the accumulated rolling reduction is more than or equal to 85 percent. The hot rolled steel coil produced by the method has the advantages of excellent toughness matching, low yield ratio and good low-temperature toughness, and simultaneously has better alkali resistance and environmental corrosion resistance compared with other pipeline steels.
Description
Technical Field
The invention belongs to the technical field of metallurgy, and particularly relates to an alkali-resistant environment corrosion-resistant pipeline steel hot rolled steel coil and a preparation method thereof.
Background
According to incomplete statistics, the direct economic loss of the industrially developed countries due to metal corrosion accounts for 2% -4% of the total national economic yield value, and the total sum of flood, fire, wind and earthquake (average) losses is far exceeded. Particularly in the environment media such as acid, alkali, salt and the like, corrosion can accelerate the failure of infrastructure such as equipment, pipelines and the like, so that the reliability and the safety of the infrastructure are greatly reduced, the light environment can generate larger economic loss, and serious safety accidents can be caused.
At present, in the aspect of corrosion of metal materials, the main research direction is to prevent acid or neutral salt spray corrosion, for example, chinese patent application No. CN201910053573.3 discloses deep sea acid-resistant pipeline steel and a rolling method, and the adverse effect of a strip structure on a product can be effectively reduced by adopting a Cr, ni and Mo alloy system and a controlled rolling and cooling process, so that the acid corrosion resistance of the steel is improved. However, since a large amount of alkaline waste water and waste gas are generated in industries related to chemical industry, paper making industry, petrochemical industry, textile industry, food industry and the like, pipeline steel pipes for transporting the waste water and waste gas are always in alkaline corrosion environment, but researches on alkaline corrosion mainly include surface composite coatings, aluminum alloy materials, fiber resin materials and the like. In view of the excellent characteristics of low cost, high strength, difficult damage, good heat resistance and the like of steel materials, it is necessary to develop a hot rolled steel coil of pipeline steel with alkali resistance and environmental corrosion resistance.
The Chinese patent application No. CN201911260698.X discloses a hot rolled steel strip of pipeline steel with seawater erosion resistance and a production method thereof, wherein a Cr and Mo alloy system is adopted to produce the hot rolled steel strip with the seawater erosion resistance, the yield strength of which is more than 650MPa, the tensile strength of which is more than 750MPa, and the Charpy impact toughness impact energy of which is more than 100J at-20 ℃. However, the addition of Cr and Mo results in high alloy cost and difficulty in meeting the low-temperature toughness requirements.
Disclosure of Invention
In order to solve the technical problems, the invention provides an alkali-resistant environment corrosion-resistant pipeline steel hot rolled steel coil and a preparation method thereof, and a hot rolled steel coil with excellent comprehensive performance and alkali-resistant environment corrosion is produced by adopting a Cu and Ni composite component design and matched hot rolling process.
In order to achieve the above purpose, the technical scheme adopted by the invention is as follows:
the hot rolled steel coil of the alkali-resistant environment corrosion-resistant pipeline steel comprises the following chemical components in percentage by mass: c:0.05 to 0.07 percent, si is less than or equal to 0.1 percent, mn:1.0 to 1.5 percent, P is less than or equal to 0.012 percent, S is less than or equal to 0.002 percent, cu:0.1 to 0.4 percent of Ni:0.1 to 0.2 percent of Ti:0.01 to 0.02 percent of Al:0.02% -0.035%, and the balance of Fe and unavoidable impurities.
The Mn:1.15 to 1.25 percent, P is less than or equal to 0.008 percent, S is less than or equal to 0.0015 percent, cu:0.18 to 0.22 percent, ni:0.14 to 0.18 percent.
The metallographic structure of the hot rolled steel coil is acicular ferrite with the area ratio of more than or equal to 60 percent, granular bainite with the area ratio of 10 to 15 percent and quasi-polygonal ferrite with the area ratio of less than or equal to 30 percent.
The yield strength of the hot rolled steel coil is 400-450 MPa, the tensile strength is 490-560 MPa, the yield ratio is less than or equal to 0.85, and the elongation A is equal to 50 More than or equal to 31 percent, the Charpy impact energy at minus 20 ℃ more than or equal to 230J, and the Charpy impact energy at minus 60 ℃ more than or equal to 190J.
The preparation method of the hot rolled steel coil of the alkali-resistant environment corrosion-resistant pipeline steel comprises the working procedures of smelting, continuous casting, heating, rolling, cooling and coiling.
The heating procedure adopts casting blank cold charging, and the total heating time is 180-240 min in a furnace, wherein the soaking time is more than or equal to 40min, and the tapping temperature is controlled between 1230 and 1270 ℃.
The rolling process comprises two stages of rough rolling and finish rolling; rough rolling is controlled according to 3+5 passes, the reduction rate of the last two passes is more than 25%, and austenite grain refinement is realized by low-temperature large reduction in a recrystallization zone; the finish rolling temperature is 930-970 ℃, the accumulated rolling reduction is more than or equal to 85 ℃, the finish rolling temperature is 830-870 ℃, austenite grains are fully flattened while mixed crystals are avoided, more nucleation positions are provided for acicular ferrite transformation, and the maximum fine crystal strengthening effect is achieved.
The cooling procedure adopts concentrated and intensive cooling at the front section, the cooling rate is more than or equal to 30 ℃/s, and the obtained structure is more uniform and compact while promoting the formation of a large amount of acicular ferrite structures.
And the coiling process is carried out at the coiling temperature of 510-550 ℃.
The beneficial effects of adopting above-mentioned technical scheme to produce lie in:
the pipeline steel hot rolled steel coil with the alkali-resistant environmental corrosion performance has the characteristics of excellent strength and toughness matching, stable performance, low yield ratio, good low-temperature toughness and the like, and simultaneously has better alkali-resistant environmental corrosion performance compared with common pipeline steel.
The yield strength of the hot rolled steel coil of the pipeline steel with alkali resistance and environmental corrosion resistance is 400-450 MPa, the tensile strength is 490-560 MPa, the yield ratio is below 0.85, the elongation of 50 gauge is above 31%, the Charpy impact energy at-20 ℃ is above 230J, and the Charpy impact energy at-60 ℃ is above 190J.
NaHCO at pH 8.2 3 In the solution, a periodic infiltration corrosion experiment simulating an alkaline service environment is carried out, and the comparison observation is carried out on the pipeline steel of three different alloy component systems with the same strength level and the conventional components, namely, independently adding Cr element and compositely adding Cu and Ni element, so that the alkaline corrosion resistance of the pipeline steel of the Cu and Ni composite component system is better than that of the pipeline steel of the other two component systems, and the use requirement of the alkaline environment can be met.
Drawings
FIG. 1 is a metallographic structure diagram of a hot rolled steel coil of example 1;
FIG. 2 is a metallographic structure diagram of a hot rolled steel coil of example 2;
fig. 3 is a graph comparing the surface morphology of the hot rolled steel coil after the periodic infiltration experiments of examples 1 and 2 and comparative examples 1 and 2 in alkaline environments of 72h, 144h, 264h and 528h respectively.
Detailed Description
The present invention will be described in further detail with reference to examples.
The hot rolled steel coil of the alkali-resistant environment corrosion-resistant pipeline steel comprises the following chemical components in percentage by mass: c:0.05 to 0.07 percent; si is less than or equal to 0.1 percent; mn:1.0 to 1.5%, preferably 1.15 to 1.25%; p is less than or equal to 0.012%, preferably less than or equal to 0.008%; s is less than or equal to 0.002%, preferably less than or equal to 0.0015%; cu:0.1 to 0.4%, preferably 0.18 to 0.22%; ni:0.1 to 0.2%, preferably 0.14 to 0.18%; ti:0.01 to 0.02 percent; al:0.02% -0.035%, and the balance of Fe and unavoidable impurities.
The metallographic structure of the hot rolled steel coil is acicular ferrite, granular bainite and quasi-polygonal ferrite, the yield strength is 400-450 MPa, the tensile strength is 490-560 MPa, the yield ratio is less than or equal to 0.85, and the elongation A is less than or equal to 50 More than or equal to 31 percent, the Charpy impact energy at minus 20 ℃ more than or equal to 230J, and the Charpy impact energy at minus 60 ℃ more than or equal to 190J.
The preparation method of the hot rolled steel coil of the alkali-resistant environment corrosion-resistant pipeline steel comprises the working procedures of smelting, continuous casting, heating, rolling, cooling and coiling. The specific parameters are controlled as follows:
(1) Heating procedure: adopting casting blank cold charging, and heating for 180-240 min in a furnace, wherein the soaking time is more than or equal to 40min, and the tapping temperature is controlled between 1230 and 1270 ℃.
(2) And (3) rolling: the method comprises two stages of rough rolling and finish rolling; rough rolling is controlled according to 3+5 times, and the reduction rate of the last two times is more than 25%; the initial rolling temperature of the finish rolling is 930-970 ℃, the accumulated rolling reduction is more than or equal to 85%, and the final rolling temperature is 830-870 ℃.
(3) And (3) a cooling procedure: adopts concentrated cooling in the front section, namely, each header in the conventional cooling section is transformed from one row to two dense cooling sections with the length of 12m and the water flow of 17400m at maximum 3 And/h, the cooling rate is more than or equal to 30 ℃/s.
(4) And (3) coiling: the coiling temperature is 510-550 ℃.
In order to embody the mechanical properties of the hot rolled steel coil of the present invention, 2 comparative examples were provided, which employed the same preparation method as the hot rolled steel coil of the present invention.
The mass percentages of the chemical components of the hot rolled steel coils of examples 1-7 and comparative examples 1 and 2 are shown in Table 1, the control of the parameters of each working procedure in the production step is shown in Table 2, and the strength, tensile, impact and cold bending test results of the hot rolled steel coils are shown in Table 3.
Table 1, chemical composition mass% of hot rolled steel coil of each example and comparative example (%)
Table 2, hot Rolling Process parameters of examples and comparative examples
TABLE 3 strength, tensile, impact and Cold Curve test results of Hot rolled Steel coil
The hot rolled steel coil of the pipeline steel prepared in the above examples and comparative examples was sampled and subjected to hanging, a periodic immersion corrosion test simulating an alkaline environment was carried out according to the test conditions in table 4, and the weight of the test sample was counted after the rust layer was removed by pickling, and the weight of the sample before the test was subtracted to obtain the weight loss of the alkaline corrosion, thereby obtaining the weight loss rate of the sample, as shown in table 5.
TABLE 4 conditions for week-leaching corrosion experiments
Table 5, weight loss statistics of samples of examples and comparative examples (%)
As shown in Table 5, compared with the conventional components and the Cr element added alone, the alkali-resistant environment corrosion resistance of the pipeline steel can be improved by adding and reasonably proportioning the Cu and Ni elements.
Fig. 1 and 2 show that the metallographic structure of the hot rolled steel coil of the alkali-resistant environment corrosion-resistant pipeline steel produced by the invention is acicular ferrite, granular bainite and quasi-polygonal ferrite, the crystal grains are obviously refined and uniform, and the structure can well prevent crack growth and has good toughness matching.
FIG. 3 shows that the alkali corrosion resistance of the pipeline steel sample can be obviously seen, and the Cu and Ni composite component system is added, and Cr element is singly added, and the conventional component is added.
Claims (4)
1. The hot rolled steel coil of the alkali-resistant environment corrosion-resistant pipeline steel is characterized by comprising the following chemical components in percentage by mass: c:0.05 to 0.07 percent, si is less than or equal to 0.1 percent, mn:1.0 to 1.5 percent, P is less than or equal to 0.012 percent, S is less than or equal to 0.002 percent, cu:0.1 to 0.4 percent of Ni:0.1 to 0.2 percent of Ti:0.01 to 0.02 percent of Al:0.02% -0.035%, and the balance of Fe and unavoidable impurities;
the metallographic structure of the hot rolled steel coil comprises acicular ferrite with the area ratio of more than or equal to 60%, granular bainite with the area ratio of 10-15% and quasi-polygonal ferrite with the area ratio of less than or equal to 30%;
the yield strength of the hot rolled steel coil is 400-450 MPa, the tensile strength is 490-560 MPa, the yield ratio is less than or equal to 0.85, and the elongation A is equal to 50 More than or equal to 31 percent, the Charpy impact energy at minus 20 ℃ more than or equal to 230J, and the Charpy impact energy at minus 60 ℃ more than or equal to 190J;
the preparation method of the hot rolled steel coil comprises the working procedures of smelting, continuous casting, heating, rolling, cooling and coiling; the rolling process comprises two stages of rough rolling and finish rolling; rough rolling is controlled according to 3+5 times, and the reduction rate of the last two times is more than 25%; the initial rolling temperature of the finish rolling is 930-970 ℃, the accumulated rolling reduction is more than or equal to 85%, and the final rolling temperature is 830-870 ℃; the cooling procedure adopts concentrated and intensive cooling at the front section, and the cooling rate is more than or equal to 30 ℃/s; and the coiling process is carried out at the coiling temperature of 510-550 ℃.
2. The alkali-resistant environmental corrosion-resistant pipeline steel hot rolled steel coil according to claim 1, wherein the Mn:1.15 to 1.25 percent, P is less than or equal to 0.008 percent, S is less than or equal to 0.0015 percent, cu:0.18 to 0.22 percent, ni:0.14 to 0.18 percent.
3. The method for preparing the hot rolled steel coil of the alkali-resistant environmental corrosion-resistant pipeline steel according to claim 1 or 2, which is characterized by comprising smelting, continuous casting, heating, rolling, cooling and coiling processes;
the rolling process comprises two stages of rough rolling and finish rolling; rough rolling is controlled according to 3+5 times, and the reduction rate of the last two times is more than 25%; the initial rolling temperature of the finish rolling is 930-970 ℃, the accumulated rolling reduction is more than or equal to 85%, and the final rolling temperature is 830-870 ℃;
the cooling procedure adopts concentrated and intensive cooling at the front section, and the cooling rate is more than or equal to 30 ℃/s;
and the coiling process is carried out at the coiling temperature of 510-550 ℃.
4. The method for preparing the hot rolled steel coil of the alkali-resistant environmental corrosion pipeline steel based on claim 3, which is characterized in that the heating procedure adopts casting blank cold charging, the total heating time of the furnace is 180-240 min, the soaking time is more than or equal to 40min, and the tapping temperature is controlled between 1230 and 1270 ℃.
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2000273578A (en) * | 1999-03-19 | 2000-10-03 | Kawasaki Steel Corp | High strength hot rolled steel sheet excellent in corrosion resistance and stretch-flanging property and its production |
| CN101921953A (en) * | 2010-09-08 | 2010-12-22 | 湖南华菱湘潭钢铁有限公司 | Production method of anti-corrosion and high strength ultra-thick steel plates |
| CN105132807A (en) * | 2015-10-10 | 2015-12-09 | 武汉钢铁(集团)公司 | Pipeline steel excellent in acid corrosion resistance on seabed and production method |
| CN114561592A (en) * | 2022-03-01 | 2022-05-31 | 广州市聚隆通用设备制造有限公司 | Method for preparing special-shaped channel steel |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| KR101008117B1 (en) * | 2008-05-19 | 2011-01-13 | 주식회사 포스코 | High strength thin steel sheet for the superier press formability and surface quality and galvanized steel sheet and method for manufacturing the same |
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Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2000273578A (en) * | 1999-03-19 | 2000-10-03 | Kawasaki Steel Corp | High strength hot rolled steel sheet excellent in corrosion resistance and stretch-flanging property and its production |
| CN101921953A (en) * | 2010-09-08 | 2010-12-22 | 湖南华菱湘潭钢铁有限公司 | Production method of anti-corrosion and high strength ultra-thick steel plates |
| CN105132807A (en) * | 2015-10-10 | 2015-12-09 | 武汉钢铁(集团)公司 | Pipeline steel excellent in acid corrosion resistance on seabed and production method |
| CN114561592A (en) * | 2022-03-01 | 2022-05-31 | 广州市聚隆通用设备制造有限公司 | Method for preparing special-shaped channel steel |
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