CN111926261A - High-strength weathering steel with yield strength of 550MPa and production method thereof - Google Patents
High-strength weathering steel with yield strength of 550MPa and production method thereof Download PDFInfo
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- CN111926261A CN111926261A CN202010894201.6A CN202010894201A CN111926261A CN 111926261 A CN111926261 A CN 111926261A CN 202010894201 A CN202010894201 A CN 202010894201A CN 111926261 A CN111926261 A CN 111926261A
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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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- 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
- 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
-
- 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
- C22C38/50—Ferrous alloys, e.g. steel alloys containing chromium with nickel with titanium or zirconium
Abstract
The invention discloses high-strength weathering steel with yield strength of 550MPa, which comprises the following chemical components in percentage by mass: c: 0.05-0.09%, Si: 0.20 to 0.30%, Mn: 0.30-0.60%, P0.07-0.15%, S less than or equal to 0.008%, Als: 0.020 to 0.050%, Ti: 0.04-0.10%, Cu: 0.20-0.55%, Ni: 0.05-0.20%, Cr: 0.30 to 0.80%, and the balance of Fe and inevitable impurities. Compared with the prior art, the mechanical property is excellent, and the production cost is low.
Description
Technical Field
The invention relates to a steel production process, in particular to a 550 MPa-grade high-strength high-weather-resistance steel plate suitable for a railway container and a production method thereof.
Background
In recent years, with the increasing requirements of the fields of railway containers, high-strength special containers and the like on weather-resistant steel plates, the steel plates are required to have good weather resistance and high yield strength, the yield strength of the conventional SPA-H weather-resistant steel plates can only be ensured to be more than 355Mpa, and the requirements of high-strength high-weather-resistant steel cannot be met.
In order to solve the defects, in the prior patent, Nb and Ti microalloy is mostly adopted for strengthening to improve the strength, and higher Cr and Ni element contents are adopted for improving the corrosion resistance, so that the high-strength and high-weather resistance are obtained, but the manufacturing cost is higher while the steelmaking difficulty is increased, and the popularization and the application of the high-strength and high-weather resistance steel are not facilitated.
Therefore, the research and development of a weather-resistant steel product with high strength, high corrosion resistance, low cost, easy production and high quality is an urgent need in the field of railway container application.
Disclosure of Invention
The technical task of the invention is to provide a high-strength weathering steel with 550 MPa-level yield strength and a production method thereof, aiming at the defects of the prior art, wherein the high-strength weathering steel has high strength and toughness indexes, and simultaneously has good welding performance and corrosion resistance.
The technical scheme for solving the technical problem is as follows: a high-strength weathering steel with a yield strength of 550MPa level is characterized in that: the weathering steel comprises the following chemical components in percentage by mass: c: 0.05-0.09%, Si: 0.20 to 0.30%, Mn: 0.30-0.60%, P0.07-0.15%, S less than or equal to 0.008%, Als: 0.020 to 0.050%, Ti: 0.04-0.10%, Cu: 0.20-0.55%, Ni: 0.05-0.20%, Cr: 0.30 to 0.80%, and the balance of Fe and inevitable impurities.
When the Mn content is reduced, the P content is increased; the sum of the contents of Mn and P is 0.4-0.7%.
The thickness specification of the weathering steel is 1.5-6.0 mm.
The yield strength of the weathering steel is more than or equal to 550MPa, the tensile strength is 620-780MPa, and the elongation is more than or equal to 16%.
Compared with the prior art, the invention has the following outstanding beneficial effects:
1. according to the invention, through reasonable component design, the welding performance of the steel is improved by adopting low carbon, and the formation of carbide structures is reduced, so that a single structure is obtained, and the corrosion resistance and the low-temperature impact toughness of the steel are improved; the microalloy element Ti is added in the components, so that on one hand, the strength is improved through precipitation strengthening, on the other hand, austenite crystal boundaries are pinned at high temperature, austenite coarsening is prevented, fine and uniform tissues are obtained after rolling, the strength and the low-temperature toughness of the steel are improved, and meanwhile, the welding performance is improved;
2. the steel has excellent mechanical properties, the yield strength is more than or equal to 550MPa, the tensile strength is 620-780MPa, and the elongation is more than or equal to 16 percent;
3. the production process of the steel adopts two-stage rolling, wherein the austenite recrystallization region is rolled in the first stage, and the austenite is thinned by adopting large-deformation rolling; in the second stage, rolling is carried out in a non-recrystallization area, the structure is further refined, a deformation zone is generated, phase change nucleation points are increased, a fine structure is obtained, the strength and the low-temperature toughness of the steel are improved, the control is easy, and the industrial production is easy;
4. the invention has simple chemical components, adopts cheap titanium alloy to strengthen the titanium micro-alloy and reduces the production cost.
Detailed Description
The present invention will be further described with reference to the following embodiments.
The technical scheme adopted by the invention is as follows: a high-strength weathering steel with a yield strength of 550MPa and a production method thereof are disclosed, wherein the weathering steel comprises the following chemical components in percentage by mass: c: 0.05-0.09%, Si: 0.20 to 0.30%, Mn: 0.30-0.60%, P0.07-0.15%, S less than or equal to 0.008%, Als: 0.020 to 0.050%, Ti: 0.04-0.10%, Cu: 0.20-0.55%, Ni: 0.05-0.20%, Cr: 0.30 to 0.80%, and the balance of Fe and inevitable impurities.
The main alloying element content of the invention is based on the following principle:
c: the alloy can improve the strength, is a main interstitial solid solution strengthening element, can form fine carbide with Ti, and plays a role in precipitation strengthening. However, if the content of C is too high, the weldability, formability and impact toughness of the steel are significantly deteriorated, pearlite transformation is promoted, and the atmospheric corrosion resistance of the steel is reduced, and if the content of C is too high, a peritectic reaction occurs during solidification of molten iron in the slab continuous casting process, so that cracks are easily generated on the surface of the slab, and the surface quality of a finished product is affected. The invention adopts low-C design, and the C content is 0.05-0.09%.
Si: the strength of the steel can be improved through solid solution strengthening, the segregation of manganese and phosphorus can be inhibited by a proper amount of silicon, the atmospheric corrosion resistance of the steel can also be improved, the smelting cost is increased when the content is less than 0.20%, and the surface of a hot-rolled steel plate is easily rough when the content is more than 0.30%, so that the content of Si in the invention is 0.20-0.30%.
Mn: the strength can be improved through solid solution strengthening, the phase transition temperature of steel can be reduced, crystal grains can be refined, the low-temperature toughness of the steel can be improved, but the hardenability is increased due to too much Mn content, so that the weldability and the toughness of a welding heat affected zone are deteriorated, and the cost is increased at the same time.
P: the high-phosphorus high-ductility weather-resistant steel is a main alloy element in the traditional weather-resistant steel, the phosphorus content is too low, the weather resistance is difficult to guarantee, but when the phosphorus content is too high, high-temperature cracks are easy to generate, the low-temperature crack sensitivity is increased, and the ductility and the toughness of a welding line are deteriorated.
S: is a harmful element, and the generated sulfide inclusion not only seriously affects the mechanical property of steel, but also has serious deterioration effect on the corrosion resistance of the steel, so the S content of the steel grade is reduced as much as possible to be less than 0.008 percent.
Cu: the Cu content of the steel is 0.20-0.55%, and the atmospheric corrosion resistance of the steel can be effectively improved when the Cu content of the steel reaches 0.25%, but when the Cu content is too high, cracks are easily generated on the surface of the steel in the heating process, and the hot brittleness of copper is caused.
Cr, Ni: all are alloy elements for improving the atmospheric corrosion resistance of the steel, and the elements of Cu, P, Cr, Ni and the like are added into the steel at the same time, so that the atmospheric corrosion resistance of the steel can be obviously improved. Ni can improve the low-temperature toughness of steel, and meanwhile, proper addition of Ni can improve the solubility of Cu in austenite and prevent the occurrence of copper brittleness. In the invention, the content of Cr is 0.30-0.60%, and the content of Ni is 0.05-0.50%.
Ti: the high-melting-point titanium carbonitride is formed, on one hand, the strength is improved through precipitation strengthening, on the other hand, austenite crystal boundaries are pinned at high temperature, austenite coarsening is prevented, fine and uniform structures are obtained after rolling, the strength and the low-temperature toughness of steel are improved, meanwhile, the welding performance is improved, and the content of Ti is 0.04-0.10%.
The design scheme has the characteristics that: the cheap titanium alloy is adopted for titanium microalloy strengthening, the contents of Mn and P are in a reverse trend, and the content of Mn is reduced, so that the content of P is increased. The sum of the contents of Mn and P is 0.4-0.7%, the matching design can still have good technical effect without the participation of Nb, and the comprehensive cost is low.
The thickness specification of the weathering steel is 1.5-6.0 mm.
The performance indexes of the weathering steel are as follows: the yield strength is more than or equal to 550MPa, the tensile strength is 620-780MPa, and the elongation is more than or equal to 16 percent.
The invention also provides a production method of the high-strength weather-resistant steel with the yield strength of 550MPa, which comprises the working procedures of converter smelting, LF refining, slab continuous casting, slab heating, high-pressure water descaling, controlled rolling, controlled cooling and reeling; and the controlled rolling process comprises the processes of rough rolling, hot coil box coiling and finish rolling.
In the slab heating process, slab hot charging is carried out to heat the slab to 1240-1300 ℃, and the heating time is controlled to be 140-200 min. The high-temperature quick firing is adopted, so that the alloy elements are fully blended, the high-strength steel has better plasticity and good plate shape during rolling, and the requirements of the rolling process are met.
In the high-pressure water descaling procedure, the descaling water pressure is more than or equal to 18 MPa. And the scale is removed by adopting high-pressure water, so that the complete removal of the surface iron oxide scale is ensured, and the surface quality requirement is met.
In the rough rolling procedure, the rough rolling is reversible rolling for 5 passes, the thickness of an intermediate blank is 32-40 mm, and the outlet temperature of the last pass of the rough rolling is 1080-1140 ℃. In the austenite recrystallization region rolling at the stage, large deformation amount rolling is adopted, and austenite is refined.
In the finish rolling procedure, the finish rolling is 7-pass continuous rolling, and the finish rolling temperature is 860-920 ℃. The process is carried out in a non-recrystallization area for rolling, further refining the structure, generating a deformation zone, increasing phase change nucleation points, being beneficial to obtaining fine structures, improving the strength and low-temperature toughness of steel, being easy to control and being easy for industrial production.
The cooling speed is not less than 22 ℃/s by controlling the cooling process.
And in the coiling process, the coiling cooling adopts front section concentrated cooling, and the coiling temperature is 600-650 ℃.
To better compare the formulations of the present application with the prior art, comparative tests were performed. The compositions and the mass percentage of the chemical components of each group are shown in the following table:
| C | Si | Mn | P | S | Als | Cu | Cr | Ni | Ti | |
| example 1 | 0.05 | 0.2 | 0.3 | 0.15 | ≤0.008 | 0.05 | 0.2 | 0.3 | 0.05 | 0.04 |
| Example 2 | 0.06 | 0.3 | 0.55 | 0.12 | ≤0.005 | 0.03 | 0.26 | 0.4 | 0.1 | 0.15 |
| Example 3 | 0.09 | 0.25 | 0.6 | 0.07 | ≤0.008 | 0.02 | 0.55 | 0.8 | 0.2 | 0.1 |
| Control group | 0.06 | 0.3 | 1.55 | 0.02 | ≤0.005 | 0.03 | 0.26 | 0.4 | 0.1 | 0.15 |
Examples 1-3 and the control were prepared as described above.
The invention relates to standard reference weathering structural steel GB/T4171-2008 of a 550 MPa-grade high-strength weathering steel product with yield strength; a product performance detection method is a standard reference metal material room temperature tensile test method GB/T228. The results of the property comparison are shown in the following table:
the results show that the tensile strength of the control group exceeds the upper limit of the standard, the elongation is lower, and the phenomenon of non-conformity with the standard exists.
It should be noted that while the invention has been described in detail with respect to specific embodiments thereof, it will be apparent to those skilled in the art that various obvious changes can be made therein without departing from the spirit and scope of the invention.
Claims (4)
1. A high-strength weathering steel with a yield strength of 550MPa level is characterized in that: the weathering steel comprises the following chemical components in percentage by mass: c: 0.05-0.09%, Si: 0.20 to 0.30%, Mn: 0.30-0.60%, P0.07-0.15%, S less than or equal to 0.008%, Als: 0.020 to 0.050%, Ti: 0.04-0.10%, Cu: 0.20-0.55%, Ni: 0.05-0.20%, Cr: 0.30 to 0.80%, and the balance of Fe and inevitable impurities.
2. The high strength weathering steel of 550MPa grade yield strength according to claim 1 characterized by: the sum of the Mn content and the P content is 0.4-0.7%.
3. The high strength weathering steel of 550MPa grade yield strength according to claim 1 characterized by: the thickness specification of the weathering steel is 1.5-6.0 mm.
4. The high strength weathering steel of 550MPa grade yield strength according to claim 1 characterized by: the yield strength of the weathering steel is more than or equal to 550MPa, the tensile strength is 620-780MPa, and the elongation is more than or equal to 16%.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN114231843A (en) * | 2021-12-03 | 2022-03-25 | 日照钢铁控股集团有限公司 | Manufacturing method of plate-band weathering steel product for container gooseneck tunnel |
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Application publication date: 20201113 |