CN114645125A - Method for reducing yield ratio of weather-resistant bridge steel - Google Patents

Method for reducing yield ratio of weather-resistant bridge steel Download PDF

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CN114645125A
CN114645125A CN202210218207.0A CN202210218207A CN114645125A CN 114645125 A CN114645125 A CN 114645125A CN 202210218207 A CN202210218207 A CN 202210218207A CN 114645125 A CN114645125 A CN 114645125A
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yield ratio
normalizing
weather
bridge steel
steel
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杨雄
王少炳
卢晓禹
杨源远
魏慧慧
白海瑞
王栋
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Baotou Iron and Steel Group 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
    • 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
    • C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
    • C21D1/26—Methods of annealing
    • C21D1/28—Normalising
    • 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
    • C21D6/00—Heat treatment of ferrous alloys
    • C21D6/004—Heat treatment of ferrous alloys containing Cr and Ni
    • 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
    • C21D6/00—Heat treatment of ferrous alloys
    • C21D6/005—Heat treatment of ferrous alloys containing Mn
    • 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
    • C21D6/00—Heat treatment of ferrous alloys
    • C21D6/008—Heat treatment of ferrous alloys containing Si
    • 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
    • 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
    • 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
    • C22C38/06—Ferrous alloys, e.g. steel alloys containing aluminium
    • 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
    • C22C38/48—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
    • 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

Abstract

The invention discloses a method for reducing the yield ratio of weather-resistant bridge steel, which comprises the following steps of molten iron pretreatment, converter smelting, LF refining, RH vacuum treatment, continuous casting, slow cooling, slab heating and TMCP, and further comprises the following heat treatment processes: normalizing in a two-phase region, wherein the normalizing temperature is Ac1+ (60-90) DEG C, the furnace time is 1.5min/mm x t (mm) + 20-30 min, Ac1 is the temperature at which ferrite begins to transform into austenite during heating, and t is the thickness of a steel plate. The invention aims to provide a method for reducing the yield ratio of weather-resistant bridge steel, which stably controls the yield ratio of a steel plate with the yield ratio exceeding the standard in a weather-resistant bridge steel plate after TMCP or TMCP + tempering to be below 0.85, obviously improves the qualification rate of the weather-resistant bridge steel, and reduces the production cost and loss.

Description

Method for reducing yield ratio of weather-resistant bridge steel
Technical Field
The invention relates to the technical field of steel, in particular to a method for reducing the yield ratio of weather-resistant bridge steel.
Background
For bridge steel and building steel, the yield ratio is a very key mechanical index. Yield ratio is an important parameter in measuring the work hardening capacity of steel and reflects the proximity of yield strength and tensile strength. The high yield ratio steel can be fractured quickly after yielding, and the low yield ratio steel can be fractured only after being subjected to larger strain strengthening and reaching higher tensile strength, so that the low yield ratio steel (less than 0.85) is expected to be selected during building and bridge design to improve the safety of a bridge structure.
Research shows that the factors influencing the yield ratio of steel are many, and the control difficulty is high. Taking bridge steel as an example, first, the higher the strength, the higher the yield ratio. The 235-355 MPa grade product structure mainly comprises ferrite and pearlite, and proper yield ratio and toughness matching are achieved by controlling the grain size, the yield ratio is generally low, and the control is easy; the low-carbon bainite structure is obtained by controlling rolling and cooling processes of 420-550 MPa grade products, and the yield ratio is greatly improved while the strength, the plasticity and the toughness are ensured; second, the chemical composition and process have a significant impact on yield ratio. The normalizing steel plate adopting the medium carbon component has uniform and stable structure, lower yield ratio, but poorer toughness and welding performance. The steel plate prepared by adopting TMCP or TMCP plus tempering process of low-carbon microalloying components has excellent toughness and welding performance, but the yield ratio is higher.
The weather-resistant bridge steel belongs to typical low-carbon microalloy steel, the yield ratio is required to be controlled below 0.85 while high strength, high toughness and good welding performance are required, various steel enterprises adopt a plurality of measures to control the yield ratio in production, but the yield ratio of partial steel plates exceeds the standard, and loss is brought to the enterprises.
Patent CN 111979481B discloses a thin-gauge low-yield-ratio high-strength bridge steel and a production method thereof. The steel plate adopts the component design of increasing Mn and Cr elements and reducing Nb and Ti elements, and comprises the following chemical components in percentage by mass: c: 0.06-0.08%, Si: 0.15-0.25%, P is less than or equal to 0.015%, S is less than or equal to 0.008%, Ni: 0.2 to 0.4%, Mo: 0.1-0.2%, Al: 0.01-0.045%, Mn + Cr: 1.90-2.20%, Nb + Ti: 0.035-0.05% of the total weight of the alloy, and the balance of Fe and other inevitable impurities. The ferrite and bainite dual-phase structure is obtained by adopting a rolling cooling process of high-temperature finish rolling and variable-speed cooling after rolling, the yield strength of the steel plate is 520-570 MPa, the tensile strength is 670-760 MPa, and the yield ratio is 0.69-0.79, so that the good balance of the strength and the yield ratio of the bridge steel with the thickness of 8-16 mm and the strength of 500-550 MPa is realized. The defects that the two-stage variable speed cooling process is adopted, the control difficulty is high, the requirement on the precision of cooling equipment is high, and the method is not suitable for all enterprises. And secondly, a rescue method of the steel plate with the yield ratio exceeding the standard is not provided.
Patent CN 111139339 a discloses a heat treatment method for regulating and controlling strength and yield ratio of structural steel. The chemical components by mass percent C: 0.06% -0.08%, Si: 0.15-0.30%, Mn: 1.10 to 1.80 percent of the total weight of the alloy, less than or equal to 0.020 percent of P, less than or equal to 0.008 percent of S,
nb: 0.01 to 0.03 percent, Ti: 0.008-0.025%, Cr: 0.10% -0.40%, Mo: 0.30% -0.50%, Ni: 0.80 to 1.10 percent; through the two-phase zone quenching and tempering process, the yield ratio of the structural steel can be adjusted between 0.66 and 0.93, and the yield strength can be adjusted between 550MPa and 690 MPa. The disadvantages are high cost and not suitable for mass production.
Patent CN 113186454 a discloses a production method of tempered low yield ratio bridge steel. The steel comprises the following chemical components: 0.07% -0.09%, Si: 0.20-0.30%, Mn: 1.52-1.60%, P is less than or equal to 0.015%, S is less than or equal to 0.003%, Alt: 0.020% -0.045%, Nb: 0.01% -0.030%, Ti: 0.012% -0.020%, Cr: 0.16% -0.20%, Mo: 0.08-0.12%, Cu: 0.16-0.20 percent and Pcm is less than or equal to 0.22 percent. Through molten iron pretreatment → converter → refining → continuous casting → heating → rolling → cooling → tempering, the steel plate with the thickness of 6-50 mm, the yield strength of more than or equal to 420MPa, the yield ratio of less than or equal to 0.80 and the impact toughness of more than or equal to 200J at minus 40 ℃ is produced. The method has the defects that the yield ratio qualification rate is not given, and a rescue method of the steel plate with the yield ratio exceeding the standard is not given.
Disclosure of Invention
The invention aims to provide a method for reducing the yield ratio of weather-resistant bridge steel, which stably controls the yield ratio of a steel plate with the yield ratio exceeding the standard in a weather-resistant bridge steel plate after TMCP or TMCP + tempering to be below 0.85, obviously improves the qualification rate of the weather-resistant bridge steel, and reduces the production cost and loss.
In order to solve the technical problems, the invention adopts the following technical scheme:
the invention relates to a method for reducing the yield ratio of weather-resistant bridge steel, which comprises the following steps of molten iron pretreatment, converter smelting, LF refining, RH vacuum treatment, continuous casting, slow cooling, slab heating and heat treatment, and is characterized by further comprising the following heat treatment processes: normalizing in a two-phase region, wherein the normalizing temperature is Ac1+ (60-90) DEG C, the furnace time is 1.5min/mm x t (mm) + 20-30 min, Ac1 is the temperature at which ferrite begins to transform into austenite during heating, and t is the thickness of a steel plate.
Furthermore, the weather-resistant bridge steel is designed by low-carbon microalloying, and the plate blank comprises the following chemical components: 0.07 to 0.09%, 0.20 to 0.30% of Si, Mn: 1.18-1.35%, P is less than or equal to 0.015%, S is less than or equal to 0.005%, Nb: 0.04 to 0.05%, Ti 0.012 to 0.020%, Cr: 0.52 to 0.60%, Ni: 0.32 to 0.39%, Cu: 0.35-0.45%, Als: 0.017-0.027%, the welding crack sensitivity index Pcm is less than or equal to 0.2%, the weather resistance index I is more than or equal to 6.5%, and the balance of Fe and inevitable impurities.
Further, a two-phase zone normalizing heat treatment process is adopted, the normalizing temperature is 800 ℃, the furnace time is 1.5min/mm multiplied by t (mm) +20min, and after the normalizing, the yield ratio of the steel plate is reduced to be below 0.85.
Further, a two-phase zone normalizing heat treatment process is adopted, the normalizing temperature is 810 ℃, the furnace time is 1.5min/mm multiplied by t (mm) +20min, and after the normalizing, the yield ratio of the steel plate is reduced to be below 0.85.
Further, a two-phase zone normalizing heat treatment process is adopted, the normalizing temperature is 820 ℃, the furnace time is 1.5min/mm multiplied by t (mm) +20min, and after the normalizing, the yield ratio of the steel plate is reduced to be below 0.85.
Compared with the prior art, the invention has the beneficial technical effects that:
(1) through the heat treatment method of the two-phase zone normalizing, the yield ratio of the weather-resistant bridge steel is reduced, the yield ratio is stably controlled to be below 0.85, the qualification rate of the weather-resistant bridge steel is obviously improved, and the production cost and loss are reduced.
(2) Through two-phase zone normalizing, a small amount of ferrite tissues can be introduced into a single low-carbon bainite tissue, the ferrite is used as a soft phase in the tissue to reduce the dislocation density, and the yield ratio is reduced by controlling the volume fraction of two phases.
Drawings
The invention is further illustrated in the following description with reference to the drawings.
FIG. 1 shows a metallographic structure of a steel sheet of example 2 of the present invention at 200 times.
Detailed Description
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
Example 1 the chemical composition of the weathering bridge steel is given in table 1. The production process route comprises the steps of molten iron pretreatment, converter smelting, LF refining, RH vacuum treatment, continuous casting, slow cooling, plate blank heating and TMCP, and the mechanical properties under the TMCP state are shown in the table 2. Adopts a two-phase zone normalizing heat treatment process, wherein the normalizing temperature is 800 ℃, and the furnace time is 1.5min/mm multiplied by t (mm) +20 min. After normalizing, the yield ratio of the steel plate is reduced to be below 0.85.
Example 2
Example 2 the chemical composition of the weathering bridge steel is given in table 1. The production process route comprises the steps of molten iron pretreatment, converter smelting, LF refining, RH vacuum treatment, continuous casting, slow cooling, slab heating and TMCP, and the mechanical properties under the TMCP state are shown in Table 2. Adopts a two-phase zone normalizing heat treatment process, wherein the normalizing temperature is 810 ℃, and the furnace time is 1.5min/mm multiplied by t (mm) +20 min. After normalizing, the yield ratio of the steel plate is reduced to be below 0.85.
Example 3
Example 3 the chemical composition of the weathering bridge steel is given in table 1. The production process route comprises the steps of molten iron pretreatment, converter smelting, LF refining, RH vacuum treatment, continuous casting, slow cooling, slab heating and TMCP, and the mechanical properties under the TMCP state are shown in Table 2. Adopts a two-phase zone normalizing heat treatment process, the normalizing temperature is 820 ℃, and the furnace time is 1.5min/mm multiplied by t (mm) +20 min. After normalizing, the yield ratio of the steel plate is reduced to be below 0.85.
TABLE 1 chemical composition (wt%) of inventive examples 1 to 3
Examples C Si Mn P S Nb Ti Ni Cr Cu Als Pcm I
1 0.075 0.22 1.20 0.010 0.002 0.042 0.012 0.33 0.52 0.36 0.025 0.18 6.52
2 0.076 0.23 1.21 0.011 0.001 0.041 0.013 0.33 0.53 0.36 0.023 0.18 6.53
3 0.078 0.25 1.22 0.010 0.002 0.043 0.014 0.33 0.52 0.36 0.024 0.18 6.52
The steel plates of inventive examples 1-3 were tested for conventional mechanical properties, impact properties, and bending properties, and the results are shown in table 2.
TABLE 2 mechanical properties of the steel sheets of examples 1 to 3 of the present invention
Figure BDA0003530315880000051
As can be seen from Table 2, the comparative example is that the yield ratio of part of the steel plate in the TMCP state exceeds the standard, the yield strength and the tensile strength are reduced after the two-phase zone normalizing process is adopted, the yield strength reduction range is large, and the yield ratio of the steel plate is obviously reduced and is below 0.85. Obviously improve the qualification rate of the weather-proof bridge steel and reduce the production cost and loss.
The above-described embodiments are only intended to illustrate the preferred embodiments of the present invention, and not to limit the scope of the present invention, and various modifications and improvements made to the technical solution of the present invention by those skilled in the art without departing from the spirit of the present invention should fall within the protection scope defined by the claims of the present invention.

Claims (5)

1. A method for reducing the yield ratio of weather-resistant bridge steel comprises the following process steps of molten iron pretreatment, converter smelting, LF refining, RH vacuum treatment, continuous casting, slow cooling, slab heating and TMCP, and is characterized by further comprising the following heat treatment processes: normalizing in a two-phase region, wherein the normalizing temperature is Ac1+ (60-90) DEG C, the furnace time is 1.5min/mm x t (mm) + 20-30 min, Ac1 is the temperature at which ferrite begins to transform into austenite during heating, and t is the thickness of a steel plate.
2. The method for reducing the yield ratio of weathering bridge steel of claim 1 wherein the weathering bridge steel is of low carbon microalloyed design and the slab chemistry is C: 0.07 to 0.09%, 0.20 to 0.30% of Si, Mn: 1.18-1.35%, P is less than or equal to 0.015%, S is less than or equal to 0.005%, Nb: 0.04 to 0.05%, Ti 0.012 to 0.020%, Cr: 0.52 to 0.60%, Ni: 0.32 to 0.39%, Cu: 0.35-0.45%, Als: 0.017-0.027%, the welding crack sensitivity index Pcm is less than or equal to 0.2%, the weather resistance index I is more than or equal to 6.5%, and the balance of Fe and inevitable impurities.
3. The method for reducing the yield ratio of the weather-resistant bridge steel according to claim 2, wherein a two-phase zone normalizing heat treatment process is adopted, the normalizing temperature is 800 ℃, the furnace time is 1.5min/mm x t (mm) +20min, and after the normalizing, the yield ratio of the steel plate is reduced to be below 0.85.
4. The method for reducing the yield ratio of the weather-resistant bridge steel as claimed in claim 2, wherein a two-phase zone normalizing heat treatment process is adopted, the normalizing temperature is 810 ℃, the furnace time is 1.5min/mm x t (mm) +20min, and after the normalizing, the yield ratio of the steel plate is reduced to be below 0.85.
5. The method for reducing the yield ratio of the weather-resistant bridge steel as claimed in claim 2, wherein a two-phase zone normalizing heat treatment process is adopted, the normalizing temperature is 820 ℃, the furnace time is 1.5min/mm x t (mm) +20min, and after the normalizing, the yield ratio of the steel plate is reduced to be below 0.85.
CN202210218207.0A 2022-03-03 2022-03-03 Method for reducing yield ratio of weather-resistant bridge steel Pending CN114645125A (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN115505692A (en) * 2022-09-13 2022-12-23 北京科技大学 High-strength bridge steel and heat treatment method thereof

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH03130319A (en) * 1989-10-17 1991-06-04 Nippon Steel Corp Production of thin low yield ratio steel for construction use excellent in refractoriness and weldability
CN102719753A (en) * 2012-05-28 2012-10-10 江苏省沙钢钢铁研究院有限公司 Low-yield-ratio high-strength steel plate and manufacturing method thereof
CN103421941A (en) * 2013-08-19 2013-12-04 南京钢铁股份有限公司 Thermal treatment method for improving corrosion resistance of steel plate for marine-atmospheric-corrosion-resistant structure
CN109554523A (en) * 2018-10-30 2019-04-02 江苏省沙钢钢铁研究院有限公司 A kind of heat treatment method reducing low-carbon bainite bridge steel yield tensile ratio
CN109797341A (en) * 2018-10-26 2019-05-24 山东钢铁集团日照有限公司 A kind of yield strength is not less than 345MPa Weather-resistance bridge steel and preparation method thereof
CN109881088A (en) * 2019-02-15 2019-06-14 舞阳钢铁有限责任公司 Low strong high tenacity SA387Gr11Cl1 steel plate and its production method

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH03130319A (en) * 1989-10-17 1991-06-04 Nippon Steel Corp Production of thin low yield ratio steel for construction use excellent in refractoriness and weldability
CN102719753A (en) * 2012-05-28 2012-10-10 江苏省沙钢钢铁研究院有限公司 Low-yield-ratio high-strength steel plate and manufacturing method thereof
CN103421941A (en) * 2013-08-19 2013-12-04 南京钢铁股份有限公司 Thermal treatment method for improving corrosion resistance of steel plate for marine-atmospheric-corrosion-resistant structure
CN109797341A (en) * 2018-10-26 2019-05-24 山东钢铁集团日照有限公司 A kind of yield strength is not less than 345MPa Weather-resistance bridge steel and preparation method thereof
CN109554523A (en) * 2018-10-30 2019-04-02 江苏省沙钢钢铁研究院有限公司 A kind of heat treatment method reducing low-carbon bainite bridge steel yield tensile ratio
CN109881088A (en) * 2019-02-15 2019-06-14 舞阳钢铁有限责任公司 Low strong high tenacity SA387Gr11Cl1 steel plate and its production method

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN115505692A (en) * 2022-09-13 2022-12-23 北京科技大学 High-strength bridge steel and heat treatment method thereof
CN115505692B (en) * 2022-09-13 2024-01-26 北京科技大学 High-strength bridge steel and heat treatment method thereof

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