CN114032460A - Low-yield-ratio bridge steel and production method thereof - Google Patents
Low-yield-ratio bridge steel and production method thereof Download PDFInfo
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- CN114032460A CN114032460A CN202111256096.4A CN202111256096A CN114032460A CN 114032460 A CN114032460 A CN 114032460A CN 202111256096 A CN202111256096 A CN 202111256096A CN 114032460 A CN114032460 A CN 114032460A
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/02—Ferrous alloys, e.g. steel alloys containing silicon
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B1/00—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations
- B21B1/46—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling metal immediately subsequent to continuous casting
- B21B1/463—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling metal immediately subsequent to continuous casting in a continuous process, i.e. the cast not being cut before rolling
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C33/00—Making ferrous alloys
- C22C33/04—Making ferrous alloys by melting
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/005—Ferrous alloys, e.g. steel alloys containing rare earths, i.e. Sc, Y, Lanthanides
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/04—Ferrous alloys, e.g. steel alloys containing manganese
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
- C22C38/42—Ferrous alloys, e.g. steel alloys containing chromium with nickel with copper
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
- C22C38/48—Ferrous alloys, e.g. steel alloys containing chromium with nickel with niobium or tantalum
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D2211/00—Microstructure comprising significant phases
- C21D2211/005—Ferrite
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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
The invention discloses a low yield ratio bridge steel and a production method thereof, wherein the chemical components of the low yield ratio bridge steel comprise the following components in percentage by mass: 0.04-0.06% of C, Si: 0.20 to 0.30%, Mn: 1.10-1.30%, P is less than or equal to 0.030%, S is less than or equal to 0.020%, Nb: 0.010-0.020%, Cu: 0.020-0.030%, Cr: 0.025-0.035%, Ni: 0.25-0.30%, rare earth Ce: 15-25ppm, the balance being Fe and unavoidable impurities. The metallographic microstructure of the provided bridge steel with the low yield ratio is ferrite, the grain size is 9.5-10 grades, the yield strength is more than or equal to 436MPa, the tensile strength is more than or equal to 545MPa, the yield ratio is less than or equal to 0.80, the longitudinal impact energy at minus 40 ℃ is more than or equal to 120J, and the bridge steel can be widely applied to bridge structures.
Description
Technical Field
The invention belongs to the technical field of metallurgical plate production, and particularly relates to low-yield-ratio bridge steel and a production method thereof.
Background
The structural steel for the bridge is a typical steel grade in low-alloy high-strength steel, and is mainly used for manufacturing a large box girder structure highway bridge and a welded structure railway bridge. In recent years, with the rapid development of national economy of China, 8 highway bridges of 8500km, 1300km and more than 800m of highway with common grades are built every year on average; in the aspect of railway construction, the railway comprises an east channel, a southwest channel and international railway engineering, the length of a newly built and reconstructed line is up to 10000 km or more, and 50 ten thousand tons of steel are needed only for bridge construction.
The rapid development of highway and railway construction puts forward higher requirements on the quality of bridge steel. On one hand, the bridge steel develops towards high strength due to the requirement of the self weight of the bridge and the requirement of the thickness specification; on the other hand, high toughness is being developed to improve fatigue life; in addition, in order to reduce the life cycle cost of the bridge, the requirement on high weather resistance is also provided, and meanwhile, the corresponding requirement on the yield ratio is also provided. Under the current market situation, the high-performance low-yield-ratio bridge steel has good market prospect.
Disclosure of Invention
In view of one or more of the problems in the prior art, an aspect of the present invention provides a low yield ratio bridge steel, which comprises the following chemical components in percentage by mass: 0.04-0.06% of C, Si: 0.20 to 0.30%, Mn: 1.10-1.30%, P is less than or equal to 0.030%, S is less than or equal to 0.020%, Nb: 0.010-0.020%, Cu: 0.020-0.030%, Cr: 0.025-0.035%, Ni: 0.25-0.30%, rare earth Ce: 15-25ppm, the balance being Fe and unavoidable impurities.
The metallographic microstructure of the bridge steel with the low yield ratio is ferrite, the grain size is between 9.5 and 10 grades, the yield strength is more than or equal to 436MPa, the tensile strength is more than or equal to 545MPa, the yield ratio is less than or equal to 0.80, the longitudinal impact energy at minus 40 ℃ is more than or equal to 120J, and the elongation A is more than or equal to 22.5 percent.
The invention also provides a production method of the bridge steel with the low yield ratio, which comprises the following process flows of: desulfurization → converter smelting → LF refining → RH refining → continuous slab casting → slab heating → high-pressure water descaling → sizing press → E1R1 roughing mill rolling → E2R2 roughing mill rolling → (heat-insulating cover) → flying shear cutting head and tail → high-pressure water descaling → F1-F7 finishing mill rolling → intensive laminar cooling → thermal straightening, wherein,
in the rolling process, the tapping temperature of a casting blank is 1210 +/-20 ℃, and the rough rolling adopts a 3+3 mode. The in-furnace time is 220-260min, the soaking time is 30-60min, the rough rolling finishing temperature is not less than 1040 ℃, the finish rolling starting temperature is 930 +/-10 ℃, the finish rolling finishing temperature is 840 +/-10 ℃, and the thickness of the hot rolled steel strip is 18 mm;
laminar flow cooling equipment and a front dispersion cooling mode are adopted in the cooling process, and the final cooling temperature is 640 +/-20 ℃.
Based on the production method of the low-yield-ratio bridge steel and reasonable component design provided by the technical scheme, the low-yield-ratio bridge steel with a metallographic microstructure of ferrite, a grain size of 9.5-10 grades, a yield strength of more than or equal to 436MPa, a tensile strength of more than or equal to 545MPa, a yield ratio of less than or equal to 0.80, a longitudinal impact energy of more than or equal to 120J at-40 ℃ and an elongation A of more than or equal to 22.5% is obtained.
Drawings
FIG. 1 is a metallographic structure photograph of a low yield ratio bridge steel produced in example 1.
Detailed Description
The invention aims to provide the low-yield-ratio bridge steel with the characteristics of good corrosion resistance, low strength ratio and high toughness, and provides a production method of the low-yield-ratio bridge steel.
Specifically, the low yield ratio bridge steel provided by the invention comprises the following chemical components in percentage by mass: 0.04-0.06% of C, Si: 0.20 to 0.30%, Mn: 1.10-1.30%, P is less than or equal to 0.030%, S is less than or equal to 0.020%, Nb: 0.010-0.020%, Cu: 0.020-0.030%, Cr: 0.025-0.035%, Ni: 0.25-0.30%, rare earth Ce: 15-25ppm, the balance being Fe and unavoidable impurities. The design requirements of the content of each component are as follows:
the invention also provides a production method of the low yield ratio bridge steel, which comprises the following process flows of: desulfurization → converter smelting → LF refining → RH refining → continuous slab casting → slab heating → high-pressure water descaling → fixed width press → E1R1 roughing mill rolling → E2R2 roughing mill rolling → (heat preservation cover) → flying shear cutting head and tail → high-pressure water descaling → F1-F7 finishing mill rolling → intensive laminar cooling → thermal straightening → shearing → flaw detection → sign → warehousing. Wherein the following process conditions are adopted in the smelting and hot rolling processes, and other procedures can be carried out according to the conventional operation of producing bridge steel in the prior art.
1. Smelting
The molten steel for casting machine contains C0.04-0.06%, Si: 0.20 to 0.30%, Mn: 1.10-1.30%, P is less than or equal to 0.030%, S is less than or equal to 0.020%, Nb: 0.010-0.020%, Cu: 0.020-0.030%, Cr: 0.025-0.035%, Ni: 0.25-0.30%, rare earth Ce: 15-25ppm, the balance being Fe and unavoidable impurities.
2. Hot rolling
The discharging temperature of the casting blank is 1210 +/-20 ℃, and the rough rolling adopts a 3+3 mode. The in-furnace time is 220-260min, the soaking time is 30-60min, the rough rolling finishing temperature is not less than 1040 ℃, the finish rolling starting temperature is 930 +/-10 ℃, the finish rolling finishing temperature is 840 +/-10 ℃, and the thickness of the hot rolled steel strip is 18 mm. Laminar flow cooling equipment and a front dispersion cooling mode are adopted for cooling, and the final cooling temperature is 640 +/-20 ℃.
The present invention is described in more detail below with reference to examples. These examples are merely illustrative of the best mode of carrying out the invention and do not limit the scope of the invention in any way.
Example 1
The method comprises the following steps of carrying out desulfurization pretreatment on molten iron, carrying out decarburization and dephosphorization on the molten iron by adopting a top-bottom combined blown converter to obtain molten steel, blowing argon in the whole process of converter smelting, and adding scrap steel into the converter. And then, carrying out LF external refining on the molten steel smelted by the converter, carrying out RH vacuum treatment on the molten steel refined by the LF external refining to obtain smelting chemical components shown in the table 1, carrying out slab continuous casting with the superheat degree of 20 ℃, and then carrying out slab cleaning, slow cooling and continuous casting slab quality inspection. A 250mm thick slab was obtained with the chemical composition weight percentages shown in table 1. The heating temperature is 1210 ℃, the furnace time is 235min, the soaking time is 35min, the rough rolling finishing temperature is 1060 ℃, the finishing rolling starting temperature is 925 ℃, the finishing rolling temperature is 836 ℃, and the thickness of the finished steel plate is 18 mm. The cooling speed of the steel plate is 9 ℃/s, and the final cooling temperature is 656 ℃. And cooling by a cooling bed after thermal straightening, finishing and warehousing. Finally, product performance detection is carried out, and the results are shown in the following table 2. As shown in FIG. 1, a microstructure photograph of the steel sheet produced in this example is shown, and it can be seen that the metallographic microstructure of the steel sheet is ferrite with a grain size of 9.5 to 10 grades.
Example 2
The method comprises the following steps of carrying out desulfurization pretreatment on molten iron, carrying out decarburization and dephosphorization on the molten iron by adopting a top-bottom combined blown converter to obtain molten steel, blowing argon in the whole process of converter smelting, and adding scrap steel into the converter. And then, carrying out LF external refining on the molten steel smelted by the converter, carrying out RH vacuum treatment on the molten steel refined by the LF external refining to obtain smelting chemical components shown in the table 1, carrying out slab continuous casting with the superheat degree of 20 ℃, and then carrying out slab cleaning, slow cooling and continuous casting slab quality inspection. A 250mm thick slab was obtained with the chemical composition weight percentages shown in table 1. The heating temperature is 1213 ℃, the furnace time is 240min, the soaking time is 38min, the rough rolling finishing temperature is 1053 ℃, the finish rolling starting temperature is 933 ℃, the finishing temperature is 838 ℃, and the thickness of the finished steel plate is 18 mm. The cooling speed of the steel plate is 9 ℃/s, and the final cooling temperature is 655 ℃. And cooling the cooling bed after the thermal correction. And (5) finishing and warehousing. Finally, product performance detection is carried out, and the results are shown in the following table 2.
Example 3
The method comprises the following steps of carrying out desulfurization pretreatment on molten iron, carrying out decarburization and dephosphorization on the molten iron by adopting a top-bottom combined blown converter to obtain molten steel, blowing argon in the whole process of converter smelting, and adding scrap steel into the converter. And then, carrying out LF external refining on the molten steel smelted by the converter, carrying out RH vacuum treatment on the molten steel refined by the LF external refining to obtain smelting chemical components shown in the table 1, carrying out slab continuous casting with the superheat degree of 18 ℃, and then carrying out slab cleaning, slow cooling and continuous casting slab quality inspection. A 250mm thick slab was obtained with the chemical composition weight percentages shown in table 1. The heating temperature is 1220 ℃, the in-furnace time is 233min, the soaking time is 35min, the rough rolling finish rolling temperature is 1056 ℃, the finish rolling start rolling temperature is 931 ℃, the finish rolling temperature is 846 ℃, and the thickness of the finished steel plate is 18 mm. The cooling speed of the steel plate is 9 ℃/s, and the final cooling temperature is 637 ℃. And cooling the cooling bed after the thermal correction. And (5) finishing and warehousing. Finally, product performance detection is carried out, and the results are shown in the following table 2.
Comparative example 1
The method comprises the following steps of carrying out desulfurization pretreatment on molten iron, carrying out decarburization and dephosphorization on the molten iron by adopting a top-bottom combined blown converter to obtain molten steel, blowing argon in the whole process of converter smelting, and adding scrap steel into the converter. And then, carrying out LF external refining on the molten steel smelted by the converter, carrying out RH vacuum treatment on the molten steel refined by the LF external refining to obtain smelting chemical components shown in the table 1, carrying out slab continuous casting with the superheat degree of 20 ℃, and then carrying out slab cleaning, slow cooling and continuous casting slab quality inspection. A 250mm thick slab was obtained with the chemical composition weight percentages shown in table 1. The heating temperature is 1212 ℃, the furnace time is 234min, the soaking time is 35min, the rough rolling finishing temperature is 1050 ℃, the finishing rolling starting temperature is 925 ℃, the finishing rolling temperature is 835 ℃, and the thickness of the finished steel plate is 18 mm. The cooling speed of the steel plate is 9 ℃/s, and the final cooling temperature is 650 ℃. And cooling by a cooling bed after thermal straightening, finishing and warehousing. Finally, product performance detection is carried out, and the results are shown in the following table 2.
Comparative example 2
The method comprises the following steps of carrying out desulfurization pretreatment on molten iron, carrying out decarburization and dephosphorization on the molten iron by adopting a top-bottom combined blown converter to obtain molten steel, blowing argon in the whole process of converter smelting, and adding scrap steel into the converter. And then, carrying out LF external refining on the molten steel smelted by the converter, carrying out RH vacuum treatment on the molten steel refined by the LF external refining to obtain smelting chemical components shown in the table 1, carrying out slab continuous casting with the superheat degree of 20 ℃, and then carrying out slab cleaning, slow cooling and continuous casting slab quality inspection. A 250mm thick slab was obtained with the chemical composition weight percentages shown in table 1. The heating temperature is 1213 ℃, the in-furnace time is 236min, the soaking time is 36min, the rough rolling finishing temperature is 1053 ℃, the finish rolling starting temperature is 934 ℃, the finishing temperature is 840 ℃, and the thickness of the finished steel plate is 18 mm. The cooling speed of the steel plate is 9 ℃/s, and the final cooling temperature is 655 ℃. And cooling the cooling bed after the thermal correction. And (5) finishing and warehousing. Finally, product performance detection is carried out, and the results are shown in the following table 2.
Comparative example 3
The method comprises the following steps of carrying out desulfurization pretreatment on molten iron, carrying out decarburization and dephosphorization on the molten iron by adopting a top-bottom combined blown converter to obtain molten steel, blowing argon in the whole process of converter smelting, and adding scrap steel into the converter. And then, carrying out LF external refining on the molten steel smelted by the converter, carrying out RH vacuum treatment on the molten steel refined by the LF external refining to obtain smelting chemical components shown in the table 1, carrying out slab continuous casting with the superheat degree of 18 ℃, and then carrying out slab cleaning, slow cooling and continuous casting slab quality inspection. A 250mm thick slab was obtained with the chemical composition weight percentages shown in table 1. The heating temperature is 1220 ℃, the in-furnace time is 233min, the soaking time is 35min, the rough rolling and final rolling temperature is 1060 ℃, the finish rolling start temperature is 900 ℃, the final rolling temperature is 810 ℃, and the thickness of the finished steel plate is 18 mm. The cooling speed of the steel plate is 9 ℃/s, and the final cooling temperature is 605 ℃. And cooling the cooling bed after the thermal correction. And (5) finishing and warehousing. Finally, product performance detection is carried out, and the results are shown in the following table 2.
Table 1: chemical composition and content (% by mass) of Steel sheets of examples 1 to 3 and comparative examples 1 to 3
| C | Si | Mn | P | S | Nb | Cu | Cr | Ni | Ce | |
| Example 1 | 0.06 | 0.20 | 1.30 | 0.008 | 0.003 | 0.020 | 0.020 | 0.025 | 0.27 | 15ppm |
| Example 2 | 0.05 | 0.30 | 1.15 | 0.010 | 0.003 | 0.016 | 0.023 | 0.027 | 0.25 | 21ppm |
| Example 3 | 0.04 | 0.23 | 1.10 | 0.009 | 0.002 | 0.010 | 0.030 | 0.035 | 0.30 | 25ppm |
| Comparative example 1 | 0.05 | 0.15 | 0.95 | 0.008 | 0.002 | 0.015 | 0.015 | 0.021 | 0.22 | 17ppm |
| Comparative example 2 | 0.08 | 0.28 | 1.59 | 0.010 | 0.002 | 0.040 | 0.215 | 0.220 | 0.24 | 20ppm |
| Comparative example 3 | 0.05 | 0.28 | 1.17 | 0.009 | 0.003 | 0.022 | 0.023 | 0.027 | 0.26 | 15ppm |
Table 2: mechanical Properties of Steel sheets produced in examples 1 to 3 and comparative examples 1 to 3
It can be seen from tables 1 and 2 that the products of examples 1, 2 and 3 have moderate performance, the elongation rate meets the protocol requirement, the yield ratio is not more than 0.8, the component design or process conditions of comparative examples 1, 2 and 3 are outside the range defined by the invention, the tensile strength allowance of comparative examples 1 and 3 is too small, and the yield ratio is higher; the product of comparative example 2 has higher strength, lower elongation and higher yield ratio.
Finally, it should be noted that: although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art will understand that various changes, modifications and substitutions can be made without departing from the spirit and scope of the invention as defined by the appended claims. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (3)
1. The bridge steel with the low yield ratio is characterized by comprising the following chemical components in percentage by mass: 0.04-0.06% of C, Si: 0.20 to 0.30%, Mn: 1.10-1.30%, P is less than or equal to 0.030%, S is less than or equal to 0.020%, Nb: 0.010-0.020%, Cu: 0.020-0.030%, Cr: 0.025-0.035%, Ni: 0.25-0.30%, rare earth Ce: 15-25ppm, the balance being Fe and unavoidable impurities.
2. The bridge steel with low yield ratio as claimed in claim 1, wherein the metallographic microstructure of the bridge steel with low yield ratio is ferrite, the grain size is 9.5-10 grades, the yield strength is greater than or equal to 436MPa, the tensile strength is greater than or equal to 545MPa, the yield ratio is less than or equal to 0.80, the longitudinal impact power at-40 ℃ is greater than or equal to 120J, and the elongation A is greater than or equal to 22.5%.
3. A method of producing a low yield ratio bridge steel according to claim 1 or 2, comprising the following process steps: desulfurization → converter smelting → LF refining → RH refining → continuous slab casting → slab heating → high-pressure water descaling → sizing press → E1R1 roughing mill rolling → E2R2 roughing mill rolling → (heat-insulating cover) → flying shear cutting head and tail → high-pressure water descaling → F1-F7 finishing mill rolling → intensive laminar cooling → thermal straightening,
in the rolling process, the tapping temperature of a casting blank is 1210 +/-20 ℃, and the rough rolling adopts a 3+3 mode. The in-furnace time is 220-260min, the soaking time is 30-60min, the rough rolling and final rolling temperature is not less than 1040 ℃, the finish rolling starting temperature is 930 +/-10 ℃, and the finish rolling temperature is 840 +/-10 ℃;
laminar flow cooling equipment and a front dispersion cooling mode are adopted in the cooling process, and the final cooling temperature is 640 +/-20 ℃.
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2005023423A (en) * | 2003-06-12 | 2005-01-27 | Jfe Steel Kk | Method for producing low-yield-ratio high-strength high-toughness steel sheet |
| CN102277530A (en) * | 2011-08-15 | 2011-12-14 | 武汉钢铁(集团)公司 | Pipeline steel with thickness more than or equal to 25mm for deep sea and production method thereof |
| CN107686943A (en) * | 2017-08-30 | 2018-02-13 | 包头钢铁（集团）有限责任公司 | A kind of yield strength 370MPa levels rare earth Weather-resistance bridge steel plate and preparation method thereof |
| CN111979479A (en) * | 2020-07-20 | 2020-11-24 | 包头钢铁（集团）有限责任公司 | Hot-rolled steel strip with thickness of 10.0-14.0 mm, low temperature resistance and high toughness for Q345NQR2 railway carriage |
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Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2005023423A (en) * | 2003-06-12 | 2005-01-27 | Jfe Steel Kk | Method for producing low-yield-ratio high-strength high-toughness steel sheet |
| CN102277530A (en) * | 2011-08-15 | 2011-12-14 | 武汉钢铁(集团)公司 | Pipeline steel with thickness more than or equal to 25mm for deep sea and production method thereof |
| CN107686943A (en) * | 2017-08-30 | 2018-02-13 | 包头钢铁（集团）有限责任公司 | A kind of yield strength 370MPa levels rare earth Weather-resistance bridge steel plate and preparation method thereof |
| CN111979479A (en) * | 2020-07-20 | 2020-11-24 | 包头钢铁（集团）有限责任公司 | Hot-rolled steel strip with thickness of 10.0-14.0 mm, low temperature resistance and high toughness for Q345NQR2 railway carriage |
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