CN113278867A - Preparation method of Q355NHC weather-resistant structural steel belt in pre-dispersion cooling mode - Google Patents
Preparation method of Q355NHC weather-resistant structural steel belt in pre-dispersion cooling mode Download PDFInfo
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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
- 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
- C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
- C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
- C21D8/0205—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips of ferrous alloys
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- C—CHEMISTRY; METALLURGY
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- 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
- C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
- C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
- C21D8/0221—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the working steps
- C21D8/0226—Hot rolling
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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
- C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
- C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
- C21D8/0247—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the heat treatment
- C21D8/0263—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the heat treatment following hot rolling
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- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
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- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/02—Ferrous alloys, e.g. steel alloys containing silicon
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- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
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- C22C38/04—Ferrous alloys, e.g. steel alloys containing manganese
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- 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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Abstract
The invention discloses a preparation method of a Q355NHC weather-resistant structural steel strip in a pre-dispersion cooling mode, which comprises the steps of molten iron pretreatment, converter composite blowing, LF refining, continuous casting, slab heating, hot continuous rolling, laminar cooling and coiling; the hot continuous rolling comprises heating furnace, rough rolling and finish rolling; the chemical components of the material by weight percentage are as follows: c: less than or equal to 0.16 percent, Si: less than or equal to 0.50 percent, Mn: 0.50-1.50%, P: less than or equal to 0.030 percent, S: less than or equal to 0.030 percent, Ni: less than or equal to 0.65 percent, Cr: 0.40-0.80%, Cu: 0.25 to 0.50%, and the balance of Fe and inevitable impurities. The invention aims to provide a preparation method of a Q355NHC steel strip for a weather-resistant structure in a pre-dispersion cooling mode, and the hot rolled steel strip for the weather-resistant structure meeting the standard requirement is produced by optimizing a rolling process.
Description
Technical Field
The invention relates to a preparation method of a steel belt for a Q355NHC weather-resistant structure in a front dispersion cooling mode, in particular to a main steel structure material which has high strength, high corrosivity, low-temperature impact toughness resistance and high welding performance, is used in the atmospheric environment and is applied to the fields of vehicles, bridges, transmission towers and the like.
Background
The weathering steel is generally called atmospheric corrosion resistant steel, which is low alloy steel containing a certain amount of weathering alloy elements, has corrosion resistance for resisting external environment and high strength under severe environmental conditions (mainly refers to environment with strong corrosion), along with the continuous development of national economic construction of China, the weathering steel is developed from the 60 th century in China, the weathering steel is started to be involved in the 80 th century and put into batch production, and a batch of weathering steel, including Cu, P, Cr, N series and Cu, P series, is developed in the early 90 th century. The Bao steel weathering steel forms a series with the yield strength of 290-700 MPa, and can meet the use requirements of different users. The martial steel has developed the weathering steel with the strength level of more than 400MPa, and the higher strength weathering steel is being developed, and steel mills such as Ji steel, Ben steel, Tong steel, Tai steel and the like successively develop the weathering steel according to market demands, and the weathering steel has high proportion in structural steel such as buildings, bridges and the like.
The weather-resistant steel has better atmospheric corrosion resistance than common carbon structural steel, mainly because a compact rust layer is formed on the surface of steel at the initial stage of corrosion, and the rust layer prevents a corrosion medium from entering a steel matrix. If the rust layer formed on the surface of the steel is loose, the protection of the matrix is not favorable.
Yang Xiong et al (Yang Xiong et al, a steel strip for rare earth weather-resistant structure and a preparation method thereof, Chinese patent, application No. CN 107557666A) research a Q355NHC hot-rolled steel strip produced by adding rare earth elements, which has the defects that the contents of Si and Mn in smelting components are inconsistent, the rare earth elements are added, and the cooling mode in the product rolling process is not introduced.
Shen Jun Jie et al (Shen Jun Jie et al, Xuan Steel Q355NHC weather resistant angle iron production practice, Hebei metallurgy, 2017 No. 12) analyze the influence rule of alloy elements on the performance of low alloy angle iron, adopt Cu, Cr, Ni, V microalloying process, mainly used for weather resistant angle iron, have the disadvantage that V is added in the component design, and do not mention the cooling mode process parameters in the rolling company.
Anhaiyu and the like (Anhaiyu and the like, development of niobium-titanium microalloyed weathering steel Q355NHC, Sichuan metallurgy, 2016 No. 4) obtain a steel plate with pure steel and refined structure through a microalloyed component design scheme, control of purity of molten steel and reasonable rolling and cooling processes, and the steel plate has good mechanical properties.
In conclusion, the production method of the Q355NHC weathering steel related to the above patents and documents can not clearly study the influence of the steel strip performance in different cooling modes.
Disclosure of Invention
The invention aims to provide a preparation method of a Q355NHC steel strip for a weather-resistant structure in a pre-dispersion cooling mode, and the hot rolled steel strip for the weather-resistant structure meeting the standard requirement is produced by optimizing a rolling process.
In order to solve the technical problems, the invention adopts the following technical scheme:
a Q355NHC steel belt for a weather-resistant structure in a pre-dispersion cooling mode comprises the following chemical components in percentage by weight: c: less than or equal to 0.16 percent, Si: less than or equal to 0.50 percent, Mn: 0.50-1.50%, P: less than or equal to 0.030 percent, S: less than or equal to 0.030 percent, Ni: less than or equal to 0.65 percent, Cr: 0.40-0.80%, Cu: 0.25 to 0.50%, and the balance of Fe and inevitable impurities.
Further, the chemical components of the material by weight percentage are as follows: c: 0.07%, Si: 0.35%, Mn: 1.14%, P: 0.014%, S: 0.003%, Ni: 0.18%, Cr: 0.55%, Cu: 0.32%, and the balance of Fe and inevitable impurities.
Further, the chemical components of the material by weight percentage are as follows: c: 0.07%, Si: 0.38%, Mn: 1.15%, P: 0.013%, S: 0.002%, Ni: 0.19%, Cr: 0.56%, Cu: 0.32%, and the balance of Fe and inevitable impurities.
Further, the chemical components of the material by weight percentage are as follows: c: 0.08%, Si: 0.37%, Mn: 1.16%, P: 0.008%, S: 0.002%, Ni: 0.20%, Cr: 0.58%, Cu: 0.33%, and the balance of Fe and inevitable impurities.
Further, the chemical components of the material by weight percentage are as follows: c: 0.08%, Si: 0.38%, Mn: 1.14%, P: 0.009%, S: 0.003%, Ni: 0.20%, Cr: 0.58%, Cu: 0.31%, and the balance of Fe and inevitable impurities.
A preparation method of a Q355NHC weather-resistant structural steel strip in a pre-dispersion cooling mode comprises the steps of molten iron pretreatment, converter composite blowing, LF refining, continuous casting, slab heating, hot continuous rolling, laminar cooling and coiling; the hot continuous rolling comprises heating furnace, rough rolling and finish rolling;
wherein: in the slab heating step, the continuous casting slab is heated to 1180-1210 ℃ and the in-furnace time is controlled within 180-240 min; the rough rolling is performed by adopting a 3+3 mode 2-stand rolling mill, and the initial rough rolling temperature is 1100-1130 ℃; the thickness of the initial rolling intermediate blank of the finish rolling is 4.5-5.5 times of the thickness of the finished steel plate, the cumulative reduction rate of the finish rolling is more than 72%, the finish rolling temperature is 855-875 ℃, the finish rolling is finished by adopting a 7-stand continuous variable-crown rolling mill, and the initial rolling temperature of the finish rolling is 940-980 ℃; in the cooling and coiling steps, the cooling adopts an 11-mode laminar cooling mode, the cooling mode is that the cooling speed is controlled to be 25-45 ℃/s, and the coiling temperature is 580-620 ℃.
Compared with the prior art, the invention has the beneficial technical effects that:
the invention takes low-carbon manganese steel as a base, micro alloy elements such as copper, chromium, nickel and the like are added in a compounding way, the atmospheric corrosion resistance of the steel can be improved by adding the copper and the chromium into the steel, and the low-temperature impact toughness of the steel can be improved by adding the nickel into the steel, but the inventor finds that the weather-resistant structural steel Q355NHC is developed by adopting the raw material components and the mass ratio provided by the invention, combining controlled rolling and controlled cooling processes and adopting a 2250mm hot rolling production line, has good formability, low-temperature toughness and fatigue property, is successfully applied to the fields of bridges, buildings and the like, and has the following beneficial effects:
the invention provides a steel strip for a Q355NHC weather-resistant structure in a pre-dispersion cooling mode and a production method thereof, wherein the hot-rolled steel strip contains Ni: 0.15-0.25%, Cu: 0.30-0.40%, Cr: 0.55-0.65 percent of microalloy elements, a microstructure of ferrite and pearlite, a grain size of about 10 grades, high strength, good atmospheric corrosion resistance, low-temperature toughness and the like, and is suitable for the steel for weather-resistant structures. The mechanical property and the process property meet the requirements of tensile strength of 490-630 MPa, yield strength of more than or equal to 355MPa, elongation of more than or equal to 22 percent, and V-shaped impact value of more than or equal to 34J at minus 20 ℃.
Drawings
The invention is further illustrated in the following description with reference to the drawings.
FIG. 1 is a typical metallographic structure of an example of the present invention.
Detailed Description
In the following, only certain exemplary embodiments are briefly described. As those skilled in the art will recognize, the described embodiments may be modified in various different ways, all without departing from the spirit or scope of the present invention.
The following disclosure provides many different embodiments, or examples, for implementing different methods of the invention. In order to simplify the disclosure of the present invention, specific example materials and steps are described below. Of course, they are merely examples and are not intended to limit the present invention. In addition, the present invention provides examples of various specific processes and materials, but one of ordinary skill in the art may recognize applications of other processes and/or uses of other materials.
Example 1:
a preparation method of a Q355NHC steel belt for a weather-resistant structure in a pre-dispersion cooling mode comprises the following steps:
the method comprises the steps of carrying out desulfurization pretreatment on molten iron, adopting a top-bottom combined blowing smelting technology in a converter, adding a nickel plate and a copper plate into the converter, carrying out deoxidation alloying by adopting alloys such as ferromanganese, ferrosilicon, ferrochromium and the like, adjusting components to meet the tapping requirement, and enabling the tapping temperature of the converter to be more than or equal to 1620 ℃. And (3) treating the molten steel smelted by the converter in an LF refining process, and adding alloys such as ferromanganese, ferrosilicon, ferrophosphorus and the like according to the components of the molten steel to adjust the target components. Adjusting the flow of argon before feeding steel to enable the molten steel to be in a soft blowing state, feeding Si-Ca wires for calcium treatment, and ensuring that the soft blowing time is more than 8min after wire feeding to prevent the molten steel from being exposed. Smelting according to the chemical components shown in the table 1, wherein the superheat degree of continuous casting of the plate blank is 25 ℃. And then slab cleaning, slow cooling and continuous casting billet quality inspection are carried out. The heating temperature of the plate blank is 1200 ℃, the heating time is 220min, and the heated plate blank is subjected to high-pressure water dephosphorization. The width is fixed by a fixed width press, and a 2-frame roughing mill and a 7-frame CVC finishing mill are adopted. The initial rolling temperature of rough rolling is 1120 ℃, the initial rolling temperature of finish rolling is 965 ℃, the first-pass reduction of rough rolling is 32.0mm, the thickness of an intermediate billet is 43.0mm, and the finish rolling temperature is 875 ℃. Laminar cooling adopts a front dispersion cooling mode 11 (the upper nozzle and the lower nozzle are separated by one), the cooling speed is 28 ℃/s, the coiling temperature is 605 ℃, and the thickness of a finished product is 6.0 mm. The results of the mechanical property measurements of the steel strips prepared in the examples are shown in Table 2.
Example 2:
a preparation method of a Q355NHC steel belt for a weather-resistant structure in a pre-dispersion cooling mode comprises the following steps:
the method comprises the steps of carrying out desulfurization pretreatment on molten iron, adopting a top-bottom combined blowing smelting technology in a converter, adding a nickel plate and a copper plate into the converter, carrying out deoxidation alloying by adopting alloys such as ferromanganese, ferrosilicon, ferrochromium and the like, adjusting components to meet the tapping requirement, and enabling the tapping temperature of the converter to be more than or equal to 1620 ℃. And (3) processing the molten steel smelted by the converter in an LF refining process, and adding alloys such as ferromanganese, ferrosilicon, ferrochromium and the like according to the components of the molten steel to adjust the target components. Adjusting the flow of argon before feeding steel to enable the molten steel to be in a soft blowing state, feeding Si-Ca wires for calcium treatment, and ensuring that the soft blowing time is more than 8min after wire feeding to prevent the molten steel from being exposed. Smelting according to the chemical components shown in the table 1, wherein the superheat degree of continuous casting of the plate blank is 28 ℃. And then slab cleaning, slow cooling and continuous casting billet quality inspection are carried out. Heating the plate blank at 1200 ℃ for 200min, and removing phosphorus from the heated plate blank by high-pressure water. The width is fixed by a fixed width press, and a 2-frame roughing mill and a 7-frame CVC finishing mill are adopted. The initial rolling temperature of rough rolling is 1128 ℃, the initial rolling temperature of finish rolling is 960 ℃, the first reduction of rough rolling is 29.0mm, the thickness of an intermediate billet is 45.0mm, and the finish rolling temperature is 866 ℃. Laminar cooling adopts a front dispersion cooling mode of 11 (the upper nozzle and the lower nozzle are separated by one), the cooling speed is 28 ℃/s, the coiling temperature is 600 ℃, and the thickness of a finished product is 8.0 mm. The results of the mechanical property measurements of the steel strips prepared in the examples are shown in Table 2.
Example 3:
a preparation method of a Q355NHC steel belt for a weather-resistant structure in a pre-dispersion cooling mode comprises the following steps:
the method comprises the steps of carrying out desulfurization pretreatment on molten iron, adopting a top-bottom combined blowing smelting technology in a converter, adding a nickel plate and a copper plate into the converter, carrying out deoxidation alloying by adopting alloys such as ferromanganese, ferrosilicon, ferrochromium and the like, adjusting components to meet the tapping requirement, and enabling the tapping temperature of the converter to be more than or equal to 1620 ℃. And (3) processing the molten steel smelted by the converter in an LF refining process, and adding alloys such as ferromanganese, ferrosilicon, ferrochromium and the like according to the components of the molten steel to adjust the target components. Adjusting the flow of argon before feeding steel to enable the molten steel to be in a soft blowing state, feeding Si-Ca wires for calcium treatment, and ensuring that the soft blowing time is more than 8min after wire feeding to prevent the molten steel from being exposed. Smelting according to the chemical components shown in the table 1, wherein the superheat degree of continuous casting of the plate blank is 25 ℃. And then slab cleaning, slow cooling and continuous casting billet quality inspection are carried out. The heating temperature of the plate blank is 1180 ℃, the heating time is 230min, and the heated plate blank is subjected to high-pressure water dephosphorization. The width is fixed by a fixed width press, and a 2-frame roughing mill and a 7-frame CVC finishing mill are adopted. The initial rolling temperature of rough rolling is 1108 ℃, the initial rolling temperature of finish rolling is 966 ℃, the first reduction of rough rolling is 30.0mm, the thickness of an intermediate billet is 43.0mm, and the final rolling temperature of finish rolling is 870 ℃. Laminar cooling adopts a front dispersion cooling mode of 11 (the upper nozzle and the lower nozzle are separated by one), the cooling speed is 22 ℃/s, the coiling temperature is 610 ℃, and the thickness of a finished product is 6.0 mm.
FIG. 1 is a typical microstructure diagram of a steel strip produced in this example, from which it can be seen that the microstructure is ferrite and a small amount of pearlite with a grain size of about grade 10. The results of the mechanical property measurements of the steel strip prepared in this example are shown in table 2.
Example 4:
a preparation method of a Q355NHC steel belt for a weather-resistant structure in a pre-dispersion cooling mode comprises the following steps:
the method comprises the steps of carrying out desulfurization pretreatment on molten iron, adopting a top-bottom combined blowing smelting technology in a converter, adding a nickel plate and a copper plate into the converter, carrying out deoxidation alloying by adopting alloys such as ferromanganese, ferrosilicon, ferrochromium and the like, adjusting components to meet the tapping requirement, and enabling the tapping temperature of the converter to be more than or equal to 1620 ℃. And (3) treating the molten steel smelted by the converter in an LF refining process, and adding alloys such as ferromanganese, ferrosilicon, ferrophosphorus and the like according to the components of the molten steel to adjust the target components. Adjusting the flow of argon before feeding steel to enable the molten steel to be in a soft blowing state, feeding Si-Ca wires for calcium treatment, and ensuring that the soft blowing time is more than 8min after wire feeding to prevent the molten steel from being exposed. Smelting according to the chemical components shown in the table 1, wherein the superheat degree of continuous casting of the plate blank is 25 ℃. And then slab cleaning, slow cooling and continuous casting billet quality inspection are carried out. The heating temperature of the plate blank is 1202 ℃, the heating time is 200min, and the heated plate blank is subjected to high-pressure water dephosphorization. The width is fixed by a fixed width press, and a 2-frame roughing mill and a 7-frame CVC finishing mill are adopted. The initial rolling temperature of rough rolling is 1120 ℃, the initial rolling temperature of finish rolling is 950 ℃, the first-pass reduction of rough rolling is 31.0mm, the thickness of an intermediate billet is 44.0mm, and the final rolling temperature of finish rolling is 864 ℃. Laminar cooling adopts a front dispersion cooling mode of 11 (the upper nozzle and the lower nozzle are separated by one), the cooling speed is 24 ℃/s, the coiling temperature is 598 ℃, and the thickness of a finished product is 8.0 mm. The results of the mechanical property measurements of the steel strip prepared in this example are shown in table 2.
TABLE 1 chemical composition of inventive examples 1-4 (wt%)
TABLE 2 results of mechanical property measurements of steel strips prepared in examples 1 to 5 of the present invention
As can be seen from the data in Table 2, the mechanical properties and the process properties of the invention meet the requirements that the yield strength is more than or equal to 355MPa, the tensile strength is 490-630 MPa, the elongation A is more than or equal to 22 percent, and the cold bending d-a longitudinal impact energy KV at-20 DEG C2≥34J。
From the results of the above examples, it is understood that the hot rolled steel strip for a weather-resistant structure of the present invention has excellent mechanical properties, weldability and low-temperature toughness.
The above-described embodiments are merely illustrative of the preferred embodiments of the present invention, and do not limit the scope of the present invention, and various modifications and improvements of the technical solutions of the present invention can be made by those skilled in the art without departing from the spirit of the present invention, and the technical solutions of the present invention are within the scope of the present invention defined by the claims.
Claims (6)
1. A preparation method of a Q355NHC steel strip for a weather-resistant structure in a pre-dispersion cooling mode is characterized by comprising the steps of molten iron pretreatment, converter combined blowing, LF refining, continuous casting, slab heating, hot continuous rolling, laminar cooling and coiling; the hot continuous rolling comprises heating furnace, rough rolling and finish rolling;
wherein: in the slab heating step, the continuous casting slab is heated to 1180-1210 ℃ and the in-furnace time is controlled within 180-240 min; the rough rolling is performed by adopting a 3+3 mode 2-stand rolling mill, and the initial rough rolling temperature is 1100-1130 ℃; the thickness of the initial rolling intermediate blank of the finish rolling is 4.5-5.5 times of the thickness of the finished steel plate, the cumulative reduction rate of the finish rolling is more than 72%, the finish rolling temperature is 855-875 ℃, the finish rolling is finished by adopting a 7-stand continuous variable-crown rolling mill, and the initial rolling temperature of the finish rolling is 940-980 ℃; in the cooling and coiling steps, the cooling adopts an 11-mode laminar cooling mode, the cooling mode is that the cooling speed is controlled to be 25-45 ℃/s, and the coiling temperature is 580-620 ℃.
2. The preparation method according to claim 1, characterized in that the chemical composition comprises, in weight percent: c: less than or equal to 0.16 percent, Si: less than or equal to 0.50 percent, Mn: 0.50-1.50%, P: less than or equal to 0.030 percent, S: less than or equal to 0.030 percent, Ni: less than or equal to 0.65 percent, Cr: 0.40-0.80%, Cu: 0.25 to 0.50%, and the balance of Fe and inevitable impurities.
3. The preparation method according to claim 2, characterized in that the chemical composition comprises, in weight percent: c: 0.07%, Si: 0.35%, Mn: 1.14%, P: 0.014%, S: 0.003%, Ni: 0.18%, Cr: 0.55%, Cu: 0.32%, and the balance of Fe and inevitable impurities.
4. The steel strip for Q355NHC weather-resistant structure in the front dispersion cooling mode according to claim 2, characterized by comprising the following chemical components in percentage by weight: c: 0.07%, Si: 0.38%, Mn: 1.15%, P: 0.013%, S: 0.002%, Ni: 0.19%, Cr: 0.56%, Cu: 0.32%, and the balance of Fe and inevitable impurities.
5. The preparation method according to claim 2, characterized in that the chemical composition comprises, in weight percent: c: 0.08%, Si: 0.37%, Mn: 1.16%, P: 0.008%, S: 0.002%, Ni: 0.20%, Cr: 0.58%, Cu: 0.33%, and the balance of Fe and inevitable impurities.
6. The preparation method according to claim 2, characterized in that the chemical composition comprises, in weight percent: c: 0.08%, Si: 0.38%, Mn: 1.14%, P: 0.009%, S: 0.003%, Ni: 0.20%, Cr: 0.58%, Cu: 0.31%, and the balance of Fe and inevitable impurities.
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Cited By (4)
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| CN114107840A (en) * | 2021-11-09 | 2022-03-01 | 石横特钢集团有限公司 | HRB400cE chloride ion corrosion resistant steel bar and production process thereof |
| CN114540704A (en) * | 2022-01-28 | 2022-05-27 | 包头钢铁（集团）有限责任公司 | Steel belt with 10-18mm specification and low-temperature impact resistance toughness A572Gr.50 structure and preparation method thereof |
| CN115747625A (en) * | 2022-12-12 | 2023-03-07 | 包头钢铁（集团）有限责任公司 | Smelting method of 500 MPa-level structural H-shaped steel with good low-temperature toughness |
| CN116590622A (en) * | 2023-06-15 | 2023-08-15 | 重庆钢铁股份有限公司 | Q355NHC weather-resistant steel plate and preparation method thereof |
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