CN110735089A - Production method of weather-resistant bridge steel - Google Patents
Production method of weather-resistant bridge steel Download PDFInfo
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- CN110735089A CN110735089A CN201911197297.4A CN201911197297A CN110735089A CN 110735089 A CN110735089 A CN 110735089A CN 201911197297 A CN201911197297 A CN 201911197297A CN 110735089 A CN110735089 A CN 110735089A
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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
- B21B1/22—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 plates, strips, bands or sheets of indefinite length
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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
- C21D8/0221—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
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/001—Ferrous alloys, e.g. steel alloys containing N
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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
- C22C38/002—Ferrous alloys, e.g. steel alloys containing In, Mg, or other elements not provided for in one single group C22C38/001 - C22C38/60
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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
- C22C38/06—Ferrous alloys, e.g. steel alloys containing aluminium
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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
- B21B1/22—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 plates, strips, bands or sheets of indefinite length
- B21B2001/225—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 plates, strips, bands or sheets of indefinite length by hot-rolling
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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 production method of weather-resistant bridge steels, which comprises the following alloy components in percentage by mass of C0.070, Si 0.23, Mn 1.23, P0.008, S0.003, N0.03 and Al 0.03, and is characterized in that a heating system is designed, wherein the heating temperature of a heating section is 1050 +/-50 ℃, the heating temperature of a second heating section is less than or equal to 1200 ℃, the rolling process is divided into 5 rolling sections according to the thickness of a finished product, the thickness of the finished product is 8-30, the thickness of a to-be-heated plate is 5T-2.5T, the finish rolling temperature is 910-900 ℃, and the finish rolling temperature is 760-790 ℃, the formula of the alloy elements of the weather-resistant bridge steel is different from the requirements of national standard and alloy elements in the same industry, the weather-resistant bridge steel is practiced and optimized on the basis of the national standard requirements, the appropriate numerical values of every alloy elements in the weather-resistant bridge steel are more definite, and the process control precision is higher, so that the cost and the.
Description
Technical Field
The invention relates to a production method of weather-resistant bridge steel.
Background
The metal corrosion phenomenon generally exists in various fields of national economy and national defense construction, the harm is very serious, the economic loss of materials caused by atmospheric corrosion accounts for about 50% of the total corrosion loss, the weather-resistant steel refers to low alloy steel with obviously improved atmospheric corrosion resistance by adding a small amount of alloy elements (such as Cu, P, Cr, Ni, Mn, Mo, Al, V, Ti, Re and the like), the weather-resistant steel can be divided into high weather-resistant steel with the P content of 0.04-0.15% and weather-resistant steel for a welding structure with the content of less than 0.04%, the weather-resistant steel for a bridge is low-phosphorus weather-resistant steel for the welding structure, a protective rust layer can be formed on the surface of the weather-resistant steel, the infiltration and transmission of corrosion media are effectively retarded, the atmospheric corrosion resistance of the weather-resistant steel is 2-8 times that of common carbon steel, the service life is longer, the weather-resistant effect is more prominent, the coating performance can be improved by 1.5-10 times, the weather-resistant steel can be used for manufacturing vehicles, steel structures, towers, bridges and containers and the price of the weather-resistant steel is lower than stainless steel.
Disclosure of Invention
The invention aims to provide a production method of weather-resistant bridge steels, which can reduce the component design cost of the products and improve the production qualification rate of the weather-resistant bridge steel products.
The invention aims to realize the production method of weather-resistant bridge steels, which comprises the following steps:
(1) the steel-making process comprises the following alloy components in percentage by mass: c0.070, Si 0.23, Mn 1.23, P0.008, S0.003, N0.03 and Al 0.03;
(2) the rolling process design of the medium plate comprises the following steps: the method comprises the following steps of smelting a qualified blank in a steelmaking smelting mode according to the requirement of alloy elements, wherein the thickness of the qualified blank is 250mm, the width of the qualified blank is 1800mm, the length of the qualified blank is 2450 mm-3470 mm, the qualified blank is rolled into a finished product with the specification of 12-20 mm on a middle plate, the process design of the middle plate mainly comprises a temperature system process, a rough rolling process and a finish rolling process, and optimized reasonable key process design parameters are obtained after repeated comparison and practice:
the heating system is designed in such a way that the heating temperature of the th heating section is 1050 +/-50 ℃, and the heating temperature of the second heating section is less than or equal to 1200 ℃;
the rolling process design is divided into 5 rolling intervals according to the thickness of a finished product, wherein the th interval comprises the thickness of the finished product of 8-10, the thickness of 5T to be rolled, the finish rolling start temperature of 910 ℃ and the finish rolling temperature of 760 ℃, the second interval comprises the thickness of 10-12 to be rolled, the thickness of 5T to be rolled, the finish rolling start temperature of 910 ℃, the finish rolling temperature of 770 ℃, and the temperature of re-reddening of 650 ℃, the third interval comprises the thickness of 12-16 to be rolled, the thickness of 3.5T to be rolled, the finish rolling start temperature of 900 ℃, the finish rolling temperature of 780 ℃, and the temperature of re-reddening of 620 ℃, the fourth interval comprises the thickness of 16-20 to be rolled, the thickness of 2.8T to be rolled, the temperature of 900 ℃, the temperature of the re-reddening of 640 ℃, the thickness of 20-30 to be rolled, the thickness of 2.5T to be rolled, the finish rolling start temperature of 900 ℃, the temperature of 790 ℃ and the.
By the comparative analysis and application of the production process design of the weather-resistant bridge steel, the alloy component structure is optimized optimally, and the obtained mechanical property result meets the user requirements, and the following table is the performance index of Q345 qENH.
1) The optimal design of the steel-making components of the weather-resistant bridge steel is most economical compared with the use of the content of alloy components from the cost perspective, the element proportion in the formula of the alloy components is optimized, the alloy cost is reduced, the final cost of the product is further , the competitiveness of the product in the market is further , and the price advantage foundation is laid.
2) The optimized design of the production and rolling process scheme of the set of weather-resistant bridge steel is the optimal design of a medium plate rolling procedure process, and due to reasonable setting of parameters, the quality loss of process control is reduced to the minimum, the quality loss is reduced, the quality loss cost is reduced, the qualification rate and the yield of products are greatly improved, the produced waste products are reduced, the whole process is not required to be rolled again, the process manufacturing cost is reduced from another angles, and the labor production efficiency is improved;
3) the production field application of the process scheme of the set of weather-resistant bridge steel reduces the risk of quality defects on the surface of strip steel, effectively improves the process quality control strength of products, and plays a role in cost reduction and efficiency improvement on cost management.
In foreign countries, Corten A (Cu-P/Cr or P + Cr-Ni) and Corten B (Cr-Mn-Cu) series in the United states, Cu-P-Ti series, Cu-P-Cr series in Japan, Cu-P-Cr-Ni series and Al-Si series used as marine atmospheric corrosion resistance, and the like. The Cu-P-RE series, Cu-P-Nb + V + Ti series which are originally developed according to the resource status of China in China can be simply divided into Cu-P series and Cu-P-Cr-Ni series according to the national standard GB/T4171-2000, and the weather-resistant steel component systems can also be simply divided into 09CuPTiRe, 08CuP and 09CuPCrNi of Wu steel, 08CuPVRe of saddle steel, 09MnNb of Ji steel, 10CrMoAl and 10CrCuSiV of Shang Steel three factories and the like. Since the 21 st century, the research on the weathering steel in China is different in colors, and a plurality of component systems appear.
According to the relevant standards, the weathering steel must reach a corrosion index of in the composition design, which is calculated by formula (1). in order to ensure that the weathering steel is easy to weld without weld cracking when in use, the composition design must also take into account the weld cold crack susceptibility of the composition system, which is calculated by formula (2).
I=26.01（%Cu）+3.88(%Ni)+1.20(%Cr)+1.49（%Si）+17.28（%P）-7.29（%Ni）（%Cu）-9.10（%Ni）（%P）-33.39（%Cu）（%Cu） (1)
Pcm=C+Si/30+(Mn+Cu+Cr)/20+Mo/15+Ni/60+V/10+5B (2)
The invention makes a comparison by looking up the existing data, finds that the weather-resistant bridge steel used by the team has no composition the same as that of the weather-resistant bridge steel, and meanwhile, the components designed by the team have own advantages in terms of composition use and performance results, and greatly improves and perfects the existing weather-resistant bridge steel production technology in the aspects of saving cost and product quality qualification rate.
The design of alloy components in the method is optimized and debugged mainly from the numerical values of alloy elements such as C, Mn, P, S, Si and the like, the mechanical property and the weldability of a finished product are influenced due to the overhigh content of C, Mn element, the extensibility and the brittleness of the product are influenced due to the overhigh content of P, S element, the strength of the product is influenced, and an optimized weather-resistant bridge steel alloy component formula is obtained through repeated comparison tests.
Detailed Description
The production method of weather-resistant bridge steel comprises the following steps:
(1) the steel-making process comprises the following alloy components in percentage by mass: c0.070, Si 0.23, Mn 1.23, P0.008, S0.003, N0.03 and Al 0.03;
(2) the rolling process design of the medium plate comprises the following steps: the method comprises the following steps of smelting a qualified blank in a steelmaking smelting mode according to the requirement of alloy elements, wherein the thickness of the qualified blank is 250mm, the width of the qualified blank is 1800mm, the length of the qualified blank is 2450 mm-3470 mm, the qualified blank is rolled into a finished product with the specification of 12-20 mm on a middle plate, the process design of the middle plate mainly comprises a temperature system process, a rough rolling process and a finish rolling process, and optimized reasonable key process design parameters are obtained after repeated comparison and practice:
the heating system is designed in such a way that the heating temperature of the th heating section is 1050 +/-50 ℃, and the heating temperature of the second heating section is less than or equal to 1200 ℃;
the rolling process design is divided into 5 rolling intervals according to the thickness of a finished product, wherein the th interval comprises the thickness of the finished product of 8-10, the thickness of 5T to be rolled, the finish rolling start temperature of 910 ℃ and the finish rolling temperature of 760 ℃, the second interval comprises the thickness of 10-12 to be rolled, the thickness of 5T to be rolled, the finish rolling start temperature of 910 ℃, the finish rolling temperature of 770 ℃, and the temperature of re-reddening of 650 ℃, the third interval comprises the thickness of 12-16 to be rolled, the thickness of 3.5T to be rolled, the finish rolling start temperature of 900 ℃, the finish rolling temperature of 780 ℃, and the temperature of re-reddening of 620 ℃, the fourth interval comprises the thickness of 16-20 to be rolled, the thickness of 2.8T to be rolled, the temperature of 900 ℃, the temperature of the re-reddening of 640 ℃, the thickness of 20-30 to be rolled, the thickness of 2.5T to be rolled, the finish rolling start temperature of 900 ℃, the temperature of 790 ℃ and the.
Application example: the 20mm specification rolling control cooling process comprises the following steps:
Claims (1)
1, production method of weather-resistant bridge steel, which is characterized in that the method comprises the following steps:
1) and designing the alloy components of the steelmaking process according to the mass percent: c0.070, Si 0.23, Mn 1.23, P0.008, S0.003, N0.03 and Al 0.03;
2) the design of the rolling process of the medium plate comprises the steps of smelting a qualified blank in a steelmaking mode according to the requirement of designed alloy elements, wherein the thickness of the qualified blank is 250mm, the width of the qualified blank is 1800mm, the length of the qualified blank is 2450 mm-3470 mm, and then the qualified blank is rolled into a finished product with the specification of 12-20 mm on the medium plate, wherein the process parameters of the medium plate are as follows, the heating system is designed, the heating temperature of the heating section is 1050 +/-50 ℃, and the heating temperature of the second heating section is less than or;
the rolling process design is divided into 5 rolling intervals according to the thickness of a finished product,
in the th interval, the thickness of the finished product is 8-10, the finish rolling start temperature is 910 ℃ and the finish rolling temperature is 760 ℃ when the temperature is 5T;
a second interval: the thickness of the finished product is 10-12, when the temperature is 5T, the rolling temperature of finish rolling is 910 ℃, the finishing temperature is 770 ℃, and the temperature of re-reddening is 650 ℃;
the third interval: the thickness of the finished product is 12-16, when the temperature is 3.5T, the finish rolling start temperature is 900 ℃, the finish rolling temperature is 780 ℃, and the temperature of re-reddening is 620 ℃;
a fourth interval: the thickness of the finished product is 16-20, when the temperature is 2.8T, the finish rolling start temperature is 900 ℃, the finish rolling temperature is 790 ℃, and the temperature of red return is 640 ℃;
the fifth interval: the thickness of the finished product is 20-30, when the temperature is 2.5T, the start rolling temperature of finish rolling is 900 ℃, the finish rolling temperature is 790 ℃, and the temperature of red return is 610 ℃.
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| CN201911197297.4A CN110735089A (en) | 2019-11-29 | 2019-11-29 | Production method of weather-resistant bridge steel |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111118401A (en) * | 2020-02-28 | 2020-05-08 | 五矿营口中板有限责任公司 | High-performance large-thickness easy-to-weld bridge structural steel and manufacturing method thereof |
| CN113235004A (en) * | 2021-05-12 | 2021-08-10 | 新疆八一钢铁股份有限公司 | Production method of bridge weathering steel with optimized alloy components |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102041436A (en) * | 2010-12-21 | 2011-05-04 | 南阳汉冶特钢有限公司 | Steel plate for low-alloy high-strength structured steel Q460C and production method thereof |
| JP2013019046A (en) * | 2011-06-14 | 2013-01-31 | Jfe Steel Corp | High strength hot dip galvanized hot rolled steel sheet and method for producing the same |
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- 2019-11-29 CN CN201911197297.4A patent/CN110735089A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102041436A (en) * | 2010-12-21 | 2011-05-04 | 南阳汉冶特钢有限公司 | Steel plate for low-alloy high-strength structured steel Q460C and production method thereof |
| JP2013019046A (en) * | 2011-06-14 | 2013-01-31 | Jfe Steel Corp | High strength hot dip galvanized hot rolled steel sheet and method for producing the same |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111118401A (en) * | 2020-02-28 | 2020-05-08 | 五矿营口中板有限责任公司 | High-performance large-thickness easy-to-weld bridge structural steel and manufacturing method thereof |
| CN113235004A (en) * | 2021-05-12 | 2021-08-10 | 新疆八一钢铁股份有限公司 | Production method of bridge weathering steel with optimized alloy components |
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Application publication date: 20200131 |