CN113755679A - Manufacturing method of weather-resistant bridge steel with uniform granular bainite structure - Google Patents

Manufacturing method of weather-resistant bridge steel with uniform granular bainite structure Download PDF

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Publication number
CN113755679A
CN113755679A CN202111058106.3A CN202111058106A CN113755679A CN 113755679 A CN113755679 A CN 113755679A CN 202111058106 A CN202111058106 A CN 202111058106A CN 113755679 A CN113755679 A CN 113755679A
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cooling
temperature
rolling
steel
finish rolling
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陈晓山
王敬忠
赵虎
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Xinjiang Bayi Iron and Steel Co Ltd
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Xinjiang Bayi Iron and Steel Co Ltd
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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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B37/00—Control devices or methods specially adapted for metal-rolling mills or the work produced thereby
    • B21B37/58—Roll-force control; Roll-gap control
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B37/00—Control devices or methods specially adapted for metal-rolling mills or the work produced thereby
    • B21B37/74—Temperature control, e.g. by cooling or heating the rolls or the product
    • B21B37/76—Cooling control on the run-out table
    • 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
    • C21D11/00—Process control or regulation for heat treatments
    • 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
    • C21D8/0221—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
    • 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
    • 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
    • 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
    • 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
    • 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
    • C22C38/46—Ferrous alloys, e.g. steel alloys containing chromium with nickel with vanadium
    • 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
    • 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
    • C22C38/50—Ferrous alloys, e.g. steel alloys containing chromium with nickel with titanium or zirconium
    • 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
    • C21D2211/002—Bainite

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Heat Treatment Of Steel (AREA)

Abstract

The invention discloses a manufacturing method of a weather-resistant bridge steel material with uniform granular bainite structure, which comprises the following production process flows: preparation of continuous casting slab → heating → rough rolling → finish rolling → controlled cooling → natural air cooling. The weather-resistant bridge steel with uniform granular bainite structure is obtained by adjusting and controlling rolling and cooling systems. The technical parameters of the control are as follows: the initial rolling temperature of the rough rolling is 1050-; the initial rolling temperature of finish rolling is 850-950 ℃, the deformation of the finish rolling pass is 25-40%, the accumulated deformation of the finish rolling is 55-70%, and the finish rolling finishing temperature is Ar3-850 ℃; the cooling starting temperature Ar3+ 20-50 ℃, the cooling rate is adjusted to 25-50 ℃/s in the first cooling stage, and the temperature is cooled to the surface temperature of 650-; the steel plate runs for 3-8 seconds without water, the second section of cooling is started, and the steel plate is cooled to the surface temperature of 620-; then the operation is carried out for 2-6 seconds without water, and the third section of cooling is started to be carried out at the cooling speed of 5-10 ℃/s until the surface temperature is 620-; the return temperature of 620 ℃ and 580 ℃.

Description

Manufacturing method of weather-resistant bridge steel with uniform granular bainite structure
Technical Field
The invention belongs to the technical field of steel production, and particularly relates to a method for manufacturing a weather-resistant bridge steel material with a uniform granular bainite structure, which is suitable for manufacturing weather-resistant bridge steel for steel structure bridge construction and is also suitable for manufacturing other low-alloy high-strength steel with the same alloying degree level.
Technical Field
The weather-resistant bridge steel belongs to the standard product of structural steel for bridges (GB/T714-2015), and is low alloy steel with obviously improved atmospheric corrosion resistance by adding a small amount of one or more of alloy elements such as Cu, P, Cr, Ni, Mn, Al, V, Ti, Nb and the like. The weathering steel with P content of 0.04-0.15% and less than 0.04% is called high weathering steel and weathering steel for welded structure, respectively. The weather-resistant steel is reported to have atmospheric corrosion resistance 2-8 times that of common carbon structural steel, the weather-resistant effect is more prominent the longer the service life is, and the coating property can be improved by 1.5-10 times. The cost of the whole life cycle of the steel structure bridge with the weather-proof bridge girder and the steel structure bridge with the same specification is calculated by relevant departments and is 1/3-1/2 of the common steel structure bridge, and the calculation does not consider the pollution cost of the replacement and the installation of the common bridge girder steel to the environment.
Compared with advanced industrial countries, the time for developing weathering steel in China is late. Corten weathering steel of Cu-Cr-P system was developed in 1933 in the United states, and Corten A and Corten B series weathering steel of Cu-Cr-Ni-P component system were developed successively; in 1995, the united states department collaborated to develop high performance weathering steel, designated HPS70W, and later HPS100W weathering bridge steel. Nearly 30000 bridges have been made of weather resistant bridge steel in the united states to date. In japan, Cu-based Cuplon weathering steel was developed and produced since 1957, a bridge was built by using weathering bridge steel since 1967, seashore weathering steel and Al-Si-series low-cost weathering steel were developed from 1980 to 2002, and after 2010, nickel-based weathering steel was used successively in the northeast new mainline, the kyushu mainline, and the northeast new mainline of japan.
The weathering steel is developed in China from 1960, the weathering steel is applied to railway trains for the first time in 1967, all new trains adopt the weathering steel in 1990, the cost of the trains is increased by 20-30%, and the service life is prolonged by about 1 time. The 09CuPVRE series and 09CuPTi series steel grades are developed in the early stage by combining the characteristics of resources in China. After 2000 years, the after-emergence advantages of the weather-resistant bridge steel in China gradually appear. National policies have also started to lead the development of weathering resistant steels, especially weathering resistant bridge steels, and national standards were established in 2015, where weathering resistant steels were incorporated into the "structural steel for bridges" (GB/T714-2015) standard, and Q345qNH, Q370qNH, Q420qNH, Q460qNH, Q500qNH, and Q550qNH were incorporated therein. The researched bridge steel with higher grades such as Q690qNH, Q345qNHY-I \ II, Q420qNHY-I \ II, Q500qNHY-I \ II and the like can resist marine atmospheric corrosion. The weathering steel has coating application, coating-free application and semi-coating application in engineering practice, according to statistics, more than 20 steel bridges are built by using the weathering steel in China, and compared with the national expressway network with 16.1 kilometres and railway operation mileage with 14.5 kilometres, the number of the weather-resistant steel bridges is actually smaller than that of Japanese in the United states, sago refers to the wizard. In the severe environment-friendly situation faced by China, weather-resistant bridge steel is also required to be popularized and applied in engineering construction.
The bridge steel required by the steel structure bridge has good welding performance and low-temperature impact toughness, and the requirement on weather resistance is increased for weather-resistant bridge steel. In order to ensure that the weather-resistant bridge steel has good welding and weather resistance and low-temperature impact property, the stable structure must be ensured in production. Researches find that the uniform pearlite + ferrite structure, bainite + pearlite + ferrite structure, bainite structure and ferrite + martensite structure can meet the requirements of the mechanical properties of the steel with corresponding strength grade. However, researches also find that the weather-resistant bridge steel in different structure states shows different change rules in the aspect of the atmospheric corrosion resistance, generally a single uniform structure shows more stable and consistent corrosion resistance along with long corrosion time. Therefore, from the viewpoint of meeting both the mechanical property and the welding property and simultaneously obtaining the long-term stable atmospheric corrosion resistance, only the bainite structure can realize a uniform single structure state, and therefore, the batch production of the weather-resistant bridge steel with the single uniform bainite structure is realized through multiple experimental researches and actual industrial production.
In the industrial production of the weather-resistant bridge steel, a controlled rolling cooling process is generally adopted, and the process flow is as follows: smelting and continuous casting of weathering resistant steel → preparation of continuous casting billet → heating → rough rolling → finish rolling → cooling → shearing → spray printing → warehousing. The so-called controlled rolling mainly comprises three main process parameters of rolling temperature, rolling speed and rolling deformation control. The rolling temperature comprises a rough rolling initial rolling temperature, a rough rolling final rolling temperature, a finish rolling initial rolling temperature and a finish rolling temperature; controlling the rolling deformation amount to comprise a rough rolling pass deformation amount, a rough rolling accumulated total deformation amount, a finish rolling pass deformation amount and a finish rolling accumulated deformation amount; the rolling speed depends primarily on the mill capacity and the process conditions of the product. The controlled cooling mainly includes, in addition to the temperature control at the rolling stage, the finishing temperature of finish rolling, the start cooling temperature, the flow rate control of each cooling stage, the finishing temperature of cooling, and the temperature control of the steel sheet for turning back.
Whether a uniform bainite structure can be obtained or not, among the above-mentioned process parameters, the accumulated deformation of rough rolling, the accumulated deformation of finish rolling, the finish rolling temperature of finish rolling, the temperature at which cooling starts, the cooling mode, the cooling finish cooling temperature, and the temperature at which the steel plate is cooled back. The accumulated deformation amount in the rough rolling stage is insufficient, a uniform recrystallized austenite structure is difficult to obtain, and the accumulated deformation amount in the rough rolling stage is controlled to be 45-55% in the production of a common bridge steel medium plate; the accumulated deformation in the finish rolling stage is mainly used for providing more nucleation positions and reserving deformation defects (dislocation, grain boundary and the like) with higher density in the phase transformation process of deformed super-cooled austenite in the subsequent cooling process so as to improve the performance of the steel, and the accumulated deformation in the finish rolling stage of the general bridge steel is controlled to be 35-50%; the finish rolling temperature determines the structure state of a finish rolling end point, such as a single-phase deformed austenite structure or a ferrite + austenite structure, so as to determine the subsequent structure state; in order to exert the function of each alloy element in the steel, the steel may stay for several seconds to promote the precipitation of second phase particles and achieve the purpose of strengthening, so the temperature for starting cooling has important influence on the texture performance; the cooling mode relates to the control of temperature in the cooling process, and under the condition of high cooling speed, a correct cooling mode is required to be adopted for avoiding the formation of a martensite structure on the surface; the final cooling temperature has obvious influence on the structure state, if the final cooling temperature is too high, the transformation from austenite to pearlite + ferrite can occur, and a uniform bainite structure is difficult to obtain; the temperature of the re-reddening depends on the final cooling temperature and the thickness of the steel sheet.
Disclosure of Invention
The invention aims to provide a method for manufacturing weathering steel with uniform granular bainite structure, which can improve the corrosion resistance and the whole life cycle of a steel bridge with a weathering bridge steel structure and reduce the maintenance cost.
The purpose of the invention is realized by the following technical scheme: a method for manufacturing weathering steel with uniform granular bainite structure comprises the following production process flows: the preparation of continuous casting billets → heating → rough rolling → finish rolling → controlled cooling → air cooling, and the technical parameters of the controlled rolling and the controlled cooling are as follows: the initial rolling temperature of the rough rolling is 1050-; the initial rolling temperature of finish rolling is 850-950 ℃, the deformation of the finish rolling pass is 25-40%, the accumulated deformation of the finish rolling is 55-70%, and the finish rolling finishing temperature is Ar3-850 ℃; the cooling starting temperature Ar3+ 20-50 ℃, the cooling rate is adjusted to 25-50 ℃/s in the first cooling stage, and the temperature is cooled to the surface temperature of 650-; the steel plate runs for 3-8 seconds without water, the second section of cooling is started, and the steel plate is cooled to the surface temperature of 620-; then the operation is carried out for 2-6 seconds without water, and the third section of cooling is started to be carried out at the cooling speed of 5-10 ℃/s until the surface temperature is 620-; the return temperature of 620 ℃ and 580 ℃.
The key control points of the weather-resistant bridge steel with the uniform granular bainite structure comprise two aspects: (1) the finishing temperature of the finishing rolling in the finishing rolling stage is higher than Ar3 temperature, if the finishing temperature is lower than the Ar3 temperature, a ferrite structure is generated firstly, and a uniform granular bainite structure cannot be obtained; the accumulated deformation of the finish rolling stage, particularly the accumulated deformation of the last few passes, is controlled, and a certain accumulated deformation can ensure that enough low-temperature phase nucleation cores and enough residual deformation defects exist in the subsequent phase change process, so that the steel has uniform tissue and high blood regulation performance. (2) In the cooling system after rolling, on one hand, the surface is ensured not to generate martensite structure in the cooling process, and on the other positions in the thickness direction, ferrite and pearlite structure are ensured not to generate; therefore, in the control of the cooling system, it is important to consider that the surface layer does not have a martensite structure and that the other portions do not have a pearlite + ferrite structure.
The manufactured weather-resistant bridge steel material has a uniform granular bainite structure, and each mechanical property index meets the requirements of the standard GB/T714-.
Detailed Description
Example 1
The material of the embodiment comprises 0.065 wt% of C, 0.22 wt% of Si, 0.22 wt% of Mn1.22, 0.022 wt% of Nb, 0.005 wt% of V, 0.021 wt% of Ti, 0.47 wt% of Cr, 0.31 wt% of Ni, 0.26 wt% of Cu, and the balance of Fe and inevitable impurities, and adopts a processing route of preparation of continuous casting billets → heating → rough rolling → finish rolling → control cooling → air cooling, wherein the rough rolling initial rolling temperature is 1150 ℃, the rough rolling accumulated deformation amount is 65%, the finish rolling initial rolling temperature is 870 ℃, the finish rolling accumulated deformation amount is 57%, the finish rolling temperature is 760 ℃, the first stage cooling is immediately carried out to the finish rolling temperature of 30 ℃/s to 630 ℃, the second stage cooling is carried out to the finish rolling temperature of 17 ℃/s to 620 ℃ after the anhydrous operation is carried out for 7 seconds, the third stage cooling is carried out after the anhydrous operation is carried out for 4 seconds, the third stage cooling is carried out to the finish rolling temperature of 570 ℃ at 8 ℃/s, and then the reddening temperature is carried out in the air cooling. The structure of the obtained Q345qNH weather-resistant bridge steel is uniform granular bainite structure.
Example 2
The material of the embodiment comprises 0.085 percent of C, 0.21 percent of Si, 1.30 percent of Mn1, 0.023 percent of Nb, 0.006 percent of V, 0.022 percent of Ti, 0.45 percent of Cr, 0.20 percent of Ni, 0.25 percent of Cu and the balance of Fe and inevitable impurities, and adopts a processing process route of preparation of continuous casting billets → heating → rough rolling → finish rolling → control cooling → air cooling, wherein the initial rolling temperature of rough rolling is 1080 ℃, the accumulated deformation amount of rough rolling is 53 percent, the initial rolling temperature of finish rolling is 900 ℃, the accumulated deformation amount of finish rolling is 65 percent, the finish rolling temperature is 780 ℃, the first stage cooling is immediately carried out to the finish rolling to be 650 ℃ at 40 ℃/s after finishing, the second stage cooling is carried out to 620 ℃ at 15 ℃/s after the anhydrous operation is carried out for 6 seconds, the third stage cooling is carried out after the anhydrous operation is carried out for 5 seconds, the third stage cooling is carried out at 8 ℃/s to 580 ℃, the temperature of returning to the red is carried out, and then the air cooling is carried out. The structure of the obtained Q420qNH weather-resistant bridge steel is uniform granular bainite structure.
Example 3
The material of the embodiment comprises 0.055% of C, 0.22% of Si, 1.21% of Mn1, 0.024% of Nb, 0.004% of V, 0.020% of Ti, 0.45% of Cr, 0.30% of Ni, 0.28% of Cu and the balance of Fe and inevitable impurities, and adopts a processing process route of continuous casting preparation → heating → rough rolling → finish rolling → controlled cooling → air cooling, wherein the rough rolling initial temperature is 1120 ℃, the rough rolling accumulated deformation is 70%, the finish rolling initial temperature is 910 ℃, the finish rolling accumulated deformation is 65%, the finish rolling final temperature is 800 ℃, the finish rolling immediately enters the first stage to be cooled to 630 ℃ at 45 ℃/s after finishing, the second stage enters the second stage to be cooled to 620 ℃ at 20 ℃/s after anhydrous operation for 6 seconds, the third stage to be cooled to 590 ℃ at 10 ℃/s after anhydrous operation for 5 seconds, the temperature of re-reddening is 620 ℃, and then enters the air cooling. The structure of the obtained Q345qNH weather-resistant bridge steel is uniform granular bainite structure.

Claims (1)

1. A method for manufacturing weather-resistant bridge steel with uniform granular bainite structure is characterized in that: obtaining the weathering steel bridge steel with uniform granular bainite structure by controlling a cooling process system; the technical parameters of the control are as follows: finishing temperature Ar3-850 ℃; the cooling starting temperature Ar3+ 20-50 ℃, the cooling rate is adjusted to 25-50 ℃/s in the first cooling stage, and the temperature is cooled to the surface temperature of 650-; the steel plate runs for 3-8 seconds without water, the second section of cooling is started, and the steel plate is cooled to the surface temperature of 620-; then the operation is carried out for 2-6 seconds without water, and the third section of cooling is started to be carried out at the cooling speed of 5-10 ℃/s until the surface temperature is 620-; the return temperature of 620 ℃ and 580 ℃.
CN202111058106.3A 2021-09-09 2021-09-09 Manufacturing method of weather-resistant bridge steel with uniform granular bainite structure Pending CN113755679A (en)

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Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101880835A (en) * 2010-06-13 2010-11-10 东北大学 Seawater corrosion resistant ultra-low carbon bainite steel and preparation method thereof
US20110284137A1 (en) * 2009-01-30 2011-11-24 Jfe Steel Corporation Thick high-tensile-strength hot-rolled steel sheet having excellent low-temperature toughness and manufacturing method thereof
CN108531808A (en) * 2018-05-07 2018-09-14 武汉钢铁有限公司 A kind of the low yield ratio weathering resistant structural steel for bridge and production method of yield strength >=690MPa
CN111719082A (en) * 2020-05-06 2020-09-29 唐山不锈钢有限责任公司 Hot-rolled weather-resistant steel strip and flexible manufacturing method thereof

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20110284137A1 (en) * 2009-01-30 2011-11-24 Jfe Steel Corporation Thick high-tensile-strength hot-rolled steel sheet having excellent low-temperature toughness and manufacturing method thereof
CN101880835A (en) * 2010-06-13 2010-11-10 东北大学 Seawater corrosion resistant ultra-low carbon bainite steel and preparation method thereof
CN108531808A (en) * 2018-05-07 2018-09-14 武汉钢铁有限公司 A kind of the low yield ratio weathering resistant structural steel for bridge and production method of yield strength >=690MPa
CN111719082A (en) * 2020-05-06 2020-09-29 唐山不锈钢有限责任公司 Hot-rolled weather-resistant steel strip and flexible manufacturing method thereof

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