CN113528957A - High-strength container steel with excellent fatigue and corrosion resistance and manufacturing method thereof - Google Patents
High-strength container steel with excellent fatigue and corrosion resistance and manufacturing method thereof Download PDFInfo
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- CN113528957A CN113528957A CN202110731151.4A CN202110731151A CN113528957A CN 113528957 A CN113528957 A CN 113528957A CN 202110731151 A CN202110731151 A CN 202110731151A CN 113528957 A CN113528957 A CN 113528957A
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- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 66
- 239000010959 steel Substances 0.000 title claims abstract description 66
- 230000007797 corrosion Effects 0.000 title claims abstract description 34
- 238000005260 corrosion Methods 0.000 title claims abstract description 34
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 22
- 239000000126 substance Substances 0.000 claims abstract description 9
- 229910052802 copper Inorganic materials 0.000 claims abstract description 8
- 239000012535 impurity Substances 0.000 claims abstract description 6
- 238000005096 rolling process Methods 0.000 claims description 25
- XEEYBQQBJWHFJM-UHFFFAOYSA-N iron Substances [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 12
- 238000000034 method Methods 0.000 claims description 10
- 238000001816 cooling Methods 0.000 claims description 9
- 229910052742 iron Inorganic materials 0.000 claims description 4
- 238000007664 blowing Methods 0.000 claims description 3
- 238000005266 casting Methods 0.000 claims description 3
- 238000009847 ladle furnace Methods 0.000 claims description 3
- 230000003009 desulfurizing effect Effects 0.000 claims description 2
- 239000000463 material Substances 0.000 claims description 2
- 239000010955 niobium Substances 0.000 description 10
- 239000010949 copper Substances 0.000 description 8
- 239000011572 manganese Substances 0.000 description 8
- 229910001566 austenite Inorganic materials 0.000 description 7
- 238000012360 testing method Methods 0.000 description 7
- 230000006872 improvement Effects 0.000 description 6
- 239000006104 solid solution Substances 0.000 description 6
- 229910052799 carbon Inorganic materials 0.000 description 5
- 238000005728 strengthening Methods 0.000 description 5
- 229910052717 sulfur Inorganic materials 0.000 description 5
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 4
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 description 4
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 description 4
- 238000010438 heat treatment Methods 0.000 description 4
- 229910052750 molybdenum Inorganic materials 0.000 description 4
- 229910052698 phosphorus Inorganic materials 0.000 description 4
- 239000011574 phosphorus Substances 0.000 description 4
- 238000001556 precipitation Methods 0.000 description 4
- 238000001953 recrystallisation Methods 0.000 description 4
- 239000011593 sulfur Substances 0.000 description 4
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 3
- PWHULOQIROXLJO-UHFFFAOYSA-N Manganese Chemical compound [Mn] PWHULOQIROXLJO-UHFFFAOYSA-N 0.000 description 3
- 230000002411 adverse Effects 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 229910052748 manganese Inorganic materials 0.000 description 3
- 229910052758 niobium Inorganic materials 0.000 description 3
- 230000008569 process Effects 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 2
- 239000002131 composite material Substances 0.000 description 2
- 238000006477 desulfuration reaction Methods 0.000 description 2
- 230000023556 desulfurization Effects 0.000 description 2
- 238000002360 preparation method Methods 0.000 description 2
- 239000002994 raw material Substances 0.000 description 2
- 238000005204 segregation Methods 0.000 description 2
- 239000000243 solution Substances 0.000 description 2
- 229910000742 Microalloyed steel Inorganic materials 0.000 description 1
- ZOKXTWBITQBERF-UHFFFAOYSA-N Molybdenum Chemical compound [Mo] ZOKXTWBITQBERF-UHFFFAOYSA-N 0.000 description 1
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 1
- ATJFFYVFTNAWJD-UHFFFAOYSA-N Tin Chemical compound [Sn] ATJFFYVFTNAWJD-UHFFFAOYSA-N 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 229910045601 alloy Inorganic materials 0.000 description 1
- 239000000956 alloy Substances 0.000 description 1
- 238000005275 alloying Methods 0.000 description 1
- VDZMENNHPJNJPP-UHFFFAOYSA-N boranylidyneniobium Chemical compound [Nb]#B VDZMENNHPJNJPP-UHFFFAOYSA-N 0.000 description 1
- 229910052796 boron Inorganic materials 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000005530 etching Methods 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 230000002401 inhibitory effect Effects 0.000 description 1
- 230000005764 inhibitory process Effects 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- QMQXDJATSGGYDR-UHFFFAOYSA-N methylidyneiron Chemical compound [C].[Fe] QMQXDJATSGGYDR-UHFFFAOYSA-N 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 239000011733 molybdenum Substances 0.000 description 1
- 230000006855 networking Effects 0.000 description 1
- GUCVJGMIXFAOAE-UHFFFAOYSA-N niobium atom Chemical compound [Nb] GUCVJGMIXFAOAE-UHFFFAOYSA-N 0.000 description 1
- 229910052757 nitrogen Inorganic materials 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 238000010587 phase diagram Methods 0.000 description 1
- 239000002244 precipitate Substances 0.000 description 1
- 230000001737 promoting effect Effects 0.000 description 1
- 229910052710 silicon Inorganic materials 0.000 description 1
- 239000010703 silicon Substances 0.000 description 1
- 229910052719 titanium Inorganic materials 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
- 230000007704 transition Effects 0.000 description 1
- 229910052720 vanadium Inorganic materials 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
- 229910000859 α-Fe Inorganic materials 0.000 description 1
Classifications
-
- 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
-
- 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
- B21B1/02—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 heavy work, e.g. ingots, slabs, blooms, or billets, in which the cross-sectional form is unimportant ; Rolling combined with forging or pressing
- B21B1/026—Rolling
-
- 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
- B21B1/02—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 heavy work, e.g. ingots, slabs, blooms, or billets, in which the cross-sectional form is unimportant ; Rolling combined with forging or pressing
- B21B1/04—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 heavy work, e.g. ingots, slabs, blooms, or billets, in which the cross-sectional form is unimportant ; Rolling combined with forging or pressing in a continuous process
-
- 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
- B21B1/24—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 in a continuous or semi-continuous process
- B21B1/26—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 in a continuous or semi-continuous process by hot-rolling, e.g. Steckel hot mill
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B15/00—Arrangements for performing additional metal-working operations specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B3/00—Rolling materials of special alloys so far as the composition of the alloy requires or permits special rolling methods or sequences ; Rolling of aluminium, copper, zinc or other non-ferrous metals
- B21B3/02—Rolling special iron alloys, e.g. stainless steel
-
- 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
-
- 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
- C22C38/04—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
- C22C38/12—Ferrous alloys, e.g. steel alloys containing tungsten, tantalum, molybdenum, vanadium, or niobium
-
- 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
- C22C38/16—Ferrous alloys, e.g. steel alloys containing copper
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B15/00—Arrangements for performing additional metal-working operations specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills
- B21B2015/0057—Coiling the rolled product
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B2261/00—Product parameters
- B21B2261/20—Temperature
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Chemical & Material Sciences (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Heat Treatment Of Sheet Steel (AREA)
Abstract
The invention discloses a high-strength container steel with excellent fatigue performance and corrosion resistance and a manufacturing method thereof, wherein the high-strength container steel comprises the following chemical components in percentage by weight: 0.04 to 0.09, Si: 0.20 to 0.50, Mn: 0.25-0.65, P: 0.015 or less, S: 0.002% or less, Cu: 0.10 to 0.35, Nb: 0.015 to 0.035, Mo: 0.10 to 0.20, Als: 0.02-0.05, and the balance of Fe and inevitable impurities. The yield strength of the high-strength container steel with excellent fatigue performance and corrosion resistance is more than or equal to 550MPa, the tensile strength is more than or equal to 600MPa, the elongation A is more than or equal to 20%, and the fatigue limit is more than or equal to 400MPa, so that the high-strength container steel with excellent fatigue performance and corrosion resistance used for heavy haul railway containers and the manufacturing method thereof can be met.
Description
Technical Field
The invention relates to the field of manufacturing of microalloyed steel, in particular to high-strength container steel with excellent fatigue performance and corrosion resistance, which is particularly suitable for manufacturing railway containers, and a manufacturing method thereof.
Background
The proportion of railway container transportation in the total railway freight volume in China is greatly behind that in western developed countries; the container has serious insufficient equipment capacity; the lack of overall planning, bargaining negotiation, political reasons and return goods sources of international class operation organizations is general and insufficient; the problems of excessive dependence on subsidies, low marketization degree and the like are prominent; the container transportation informatization and networking degree is low, and a standard information platform is lacked. In order to improve the transportation level of railway containers in China and promote development, railway general companies put forward to develop railway containers vigorously. Meanwhile, with the gradual increase of the loading capacity of the railway container, the requirement on the service life of the container is continuously improved, so that the fatigue property of the container steel also becomes an important index for measuring the performance level of the material on the premise of pursuing the strength and the corrosion resistance of the container steel. The improvement of the fatigue limit can effectively prevent the generation of fatigue cracks, and has important significance for prolonging the service life of the container and reducing the maintenance cost.
Before the application of the invention, the invention patents with patent publication numbers CN 108277442A and CN 102080191A describe 'Ti-containing container steel and a production method thereof' and 'niobium-boron composite hot-rolled high-strength container steel plate and a preparation method thereof', and the two patents respectively describe Ti micro-alloying produced by ESP process and niobium-boron composite hot-rolled high-strength container steel produced by hot continuous rolling process, and the yield strengths of the two are R respectivelyeLNot less than 400MPa and ReLNot less than 500MPa, but all do not involve design considerations with respect to fatigue performance.
Disclosure of Invention
Based on the defects of the prior art, the technical problem to be solved by the invention is to provide the high-strength container steel which has the yield strength of more than or equal to 550MPa, the tensile strength of more than or equal to 600MPa, the elongation A of more than or equal to 20 percent and the fatigue limit of more than or equal to 400MPa, can meet the requirements of heavy haul railway containers and has excellent fatigue performance and corrosion resistance, and the manufacturing method thereof.
In order to solve the technical problems, the invention provides high-strength container steel with excellent fatigue performance and corrosion resistance, which comprises the following chemical components in percentage by weight: 0.04 to 0.09, Si: 0.20 to 0.50, Mn: 0.25-0.65, P: 0.015 or less, S: 0.002% or less, Cu: 0.10 to 0.35, Nb: 0.015 to 0.035, Mo: 0.10 to 0.20, Als: 0.02-0.05, and the balance of Fe and inevitable impurities.
Preferably, the high-strength container steel with excellent fatigue and corrosion resistance and the manufacturing method thereof provided by the present invention further comprise some or all of the following technical features:
as an improvement of the technical scheme, the high-strength container steel with excellent fatigue performance and corrosion resistance preferably comprises the following chemical components in percentage by weight: 0.06-0.08, Si: 0.30-0.45, Mn: 0.40-0.60, P: less than or equal to 0.010, S: 0.002% or less, Cu: 0.20 to 0.30, Nb: 0.020 to 0.030, Mo: 0.10 to 0.20, Als: 0.02-0.05, and the balance of Fe and inevitable impurities.
A method for manufacturing a high strength container steel having excellent fatigue properties and corrosion resistance as described above, characterized in that: the production method of the high-strength container steel comprises the following steps: desulfurizing molten iron, carrying out top and bottom combined blowing of a converter, treating a ladle furnace, casting into a plate blank, controlling rolling and cooling by a hot continuous rolling mill, and coiling; wherein the rolling and cooling control of the hot continuous rolling is carried out in a hot continuous rolling unit, and the cast plate blank is heated to 1140-1180 ℃; then rolling, wherein the final rolling temperature is 790-850 ℃; and (3) carrying out laminar cooling on the rolled steel plate at the coiling temperature of 580-620 ℃ to obtain the hot rolled plate coil.
Preferably, the method for manufacturing a high-strength container steel with excellent fatigue and corrosion resistance provided by the present invention further comprises some or all of the following technical features:
as an improvement of the technical scheme, the cast slab is heated to 1150-1170 ℃.
As an improvement of the technical scheme, the finishing temperature is 800-830 ℃.
As an improvement of the technical scheme, the coiling temperature is 590-610 ℃.
As an improvement of the technical scheme, the yield strength of the high-strength container steel is more than or equal to 550MPa, the tensile strength is more than or equal to 600MPa, the elongation A is more than or equal to 20 percent, and the fatigue limit is more than or equal to 400 MPa.
The action and mechanism of each element and the main process in the invention are as follows:
the content of carbon (C) is 0.04-0.09%, carbon is one of indispensable elements for improving the strength of steel in steel, and can form microalloy carbide with Nb in the steel to play a role in precipitation strengthening, and the corrosion resistance of the steel is influenced by the excessively high content of carbon. The carbon content is limited to 0.04-0.09%, so that the strength of the steel can be improved, and the corrosion resistance of the steel can be ensured.
The content of silicon (Si) is 0.20-0.50%, the Si is mainly used for improving the strength of steel in a solid solution strengthening mode, and is also a deoxidizing element in the steel, but the content of the Si is not too high, so that the surface quality, the toughness and the welding performance of the steel are not reduced; tests show that Si can also improve the corrosion resistance of steel.
The manganese with the manganese (Mn) content of 0.25-0.65% can reduce the phase transition temperature of austenite transformed into ferrite, expand the austenite area in an iron-carbon phase diagram, promote the medium-temperature structure transformation of steel and obtain a uniform microstructure, so that the steel has excellent corrosion resistance and high strength. However, Mn increases the degree of intermediate segregation and is not favorable for both corrosion resistance and fatigue resistance, so that the Mn content is controlled to be 0.25-0.65% in the invention.
The content of phosphorus (P) is less than or equal to 0.010 percent, the content of sulfur (S) is less than or equal to 0.002 percent, phosphorus is easy to cause segregation in steel, sulfur is easy to combine with manganese to generate MnS inclusions, and the MnS inclusions are all unfavorable for fatigue performance. Therefore, the invention should reduce the adverse effects of phosphorus and sulfur elements on the forming performance and the fatigue performance of steel as much as possible, and the content of phosphorus and sulfur is controlled by means of deep desulfurization pretreatment and the like on molten iron, so that the adverse effects are reduced.
The copper (Cu) content of the invention is 0.10-0.35%, the copper can improve the hardenability of the steel, and mainly plays a role in solid solution and precipitation strengthening in the steel, and meanwhile, the corrosion resistance of the steel can be obviously improved through the proper proportion of Cu-Mo, and in addition, the fatigue crack propagation resistance of the steel can be improved. When the Cu content is less than 0.10%, the precipitation strengthening effect is not obvious, and when the Cu content is more than 0.35%, the surface of the steel plate is easy to appear copper brittleness.
The content of niobium (Nb) is 0.015-0.035%. Nb, V and Ti are the most effective microalloy elements, but Ti is active in chemical property, is easy to combine with O, S, N, C in steel, forms coarse TiN and other impurities in the steel and is unfavorable for fatigue performance, so that Ti is not additionally added in the invention. The Nb has more stable chemical property, can not only improve the recrystallization temperature of steel and reduce the load of a rolling mill, but also effectively refine the grain size of austenite by inhibiting recrystallization and preventing grain growth, and is beneficial to improving the fatigue performance.
The content of molybdenum (Mo) in the invention is 0.10-0.20%, and Mo exists in solid solution and carbide of steel and has the function of solid solution strengthening. When Mo and Nb are added simultaneously, Mo can increase the inhibition on austenite recrystallization in the controlled rolling process, thereby promoting the refinement of austenite microstructure and further improving the fatigue performance.
The heating temperature of the invention is 1140-1180 ℃. The heating temperature is an important factor influencing the fatigue performance, and the Nb element with lower solid solution temperature is mainly selected and matched with the heating temperature with lower temperature, so that the complete solid solution of alloy elements can be ensured, and simultaneously, the excessive coarseness of austenite grains and the coarseness of precipitates caused by overhigh heating temperature are avoided, thereby avoiding the adverse influence on the fatigue performance and the forming performance.
The finishing temperature of the invention is 790-850 ℃. The lower rolling temperature is adopted, the accumulated deformation of the steel plate in an austenite non-recrystallization area is increased, the grain refinement is promoted, and the strength and the fatigue performance are improved.
The coiling temperature of the invention is 580-620 ℃, so that the precipitation of Nb is more sufficient, thereby improving the strength and fatigue performance.
Compared with the prior art, the technical scheme of the invention has the following beneficial effects: tests show that the yield strength of the high-strength container steel with excellent fatigue performance and corrosion resistance is more than or equal to 550MPa, the tensile strength is more than or equal to 600MPa, the elongation A is more than or equal to 20%, and the fatigue limit is more than or equal to 400MPa, so that the high-strength container steel with excellent fatigue performance and corrosion resistance used in heavy haul railway containers and the manufacturing method thereof can be met.
The foregoing description is only an overview of the technical solutions of the present invention, and in order to make the technical means of the present invention more clearly understood, the present invention may be implemented in accordance with the contents of the description, and in order to make the above and other objects, features, and advantages of the present invention more clearly understood, the following detailed description is given in conjunction with the preferred embodiments.
Detailed Description
Other aspects, features and advantages of the present invention will become apparent from the following detailed description, which, when taken in conjunction with the drawings, illustrate by way of example the principles of the invention.
The chemical components of the steel of the invention are shown in Table 1, the production process parameters and the mechanical property test results are shown in Table 2, and the corrosion resistance test results are shown in Table 3.
TABLE 1 chemical composition of inventive Steel (wt%)
The production method of the high-strength container steel with excellent fatigue performance and corrosion resistance comprises the following steps: molten iron desulfurization, converter top and bottom combined blowing, ladle furnace treatment, casting into slab, controlled rolling and controlled cooling of a hot continuous rolling mill and coiling. Wherein the rolling and cooling control of the hot continuous rolling is carried out in a hot continuous rolling unit, and the cast plate blank is heated to 1140-1180 ℃; then rolling, wherein the final rolling temperature is 790-850 ℃; and (3) carrying out laminar cooling on the rolled steel plate at the coiling temperature of 580-620 ℃ to obtain the hot rolled plate coil.
Preferably, the cast slab is heated to 1150-1170 ℃.
Preferably, the finishing temperature is 800-830 ℃.
Preferably, the coiling temperature is 590-610 ℃.
TABLE 2 preparation method and mechanical property test results of the inventive steels
Note: components 1 to 6 in Table 2 correspond to components 1 to 6 in Table 1.
TABLE 3 Corrosion resistance test results (g/m) for inventive steels2·h)
Note: 1) the components 1-6 in table 2 correspond to the components 1-6 in table 1;
2) the etching method comprises the following steps: the temperature is 45 +/-2 ℃, and the concentration is 0.01mol/L NaHSO3The solution is soaked for 72 hours at the humidity of 70 +/-5 RH.
Tests show that the yield strength of the high-strength container steel with excellent fatigue performance and corrosion resistance is more than or equal to 550MPa, the tensile strength is more than or equal to 600MPa, the elongation A is more than or equal to 20%, and the fatigue limit is more than or equal to 400MPa, so that the high-strength container steel with excellent fatigue performance and corrosion resistance used in heavy haul railway containers and the manufacturing method thereof can be met.
The raw materials listed in the invention, the upper and lower limits and interval values of the raw materials of the invention, and the upper and lower limits and interval values of the process parameters (such as temperature, time and the like) can all realize the invention, and the examples are not listed.
While the foregoing is directed to the preferred embodiment of the present invention, other and further embodiments of the invention may be devised without departing from the basic scope thereof, and the scope thereof is determined by the claims that follow.
Claims (7)
1. A high strength container steel having excellent fatigue properties and corrosion resistance, characterized in that: the chemical components of the material are calculated by weight percentage as follows: 0.04 to 0.09, Si: 0.20 to 0.50, Mn: 0.25-0.65, P: 0.015 or less, S: 0.002% or less, Cu: 0.10 to 0.35, Nb: 0.015 to 0.035, Mo: 0.10 to 0.20, Als: 0.02-0.05, and the balance of Fe and inevitable impurities.
2. The high strength container steel having excellent fatigue and corrosion resistance as set forth in claim 1, wherein: preferably, the high-strength container steel with excellent fatigue performance and corrosion resistance comprises the following chemical components in percentage by weight: 0.06-0.08, Si: 0.30-0.45, Mn: 0.40-0.60, P: less than or equal to 0.010, S: 0.002% or less, Cu: 0.20 to 0.30, Nb: 0.020 to 0.030, Mo: 0.10 to 0.20, Als: 0.02-0.05, and the balance of Fe and inevitable impurities.
3. A method for manufacturing a high strength container steel having excellent fatigue and corrosion resistance according to claim 1 or 2, wherein: the production method of the high-strength container steel comprises the following steps: desulfurizing molten iron, carrying out top and bottom combined blowing of a converter, treating a ladle furnace, casting into a plate blank, controlling rolling and cooling by a hot continuous rolling mill, and coiling; wherein the rolling and cooling control of the hot continuous rolling is carried out in a hot continuous rolling unit, and the cast plate blank is heated to 1140-1180 ℃; then rolling, wherein the final rolling temperature is 790-850 ℃; and (3) carrying out laminar cooling on the rolled steel plate at the coiling temperature of 580-620 ℃ to obtain the hot rolled plate coil.
4. The method for manufacturing a high strength container steel having excellent fatigue and corrosion resistance according to claim 3, wherein: the cast slab is heated to 1150-1170 ℃.
5. The method for manufacturing a high strength container steel having excellent fatigue and corrosion resistance according to claim 3, wherein: the finishing temperature is 800-830 ℃.
6. The method for manufacturing a high strength container steel having excellent fatigue and corrosion resistance according to claim 3, wherein: the coiling temperature is 590-610 ℃.
7. A high strength container steel having excellent fatigue and corrosion resistance as set forth in claim 1 or 2, wherein: the yield strength of the high-strength container steel is more than or equal to 550MPa, the tensile strength is more than or equal to 600MPa, the elongation A is more than or equal to 20 percent, and the fatigue limit is more than or equal to 400 MPa.
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| JP2001164334A (en) * | 1999-12-03 | 2001-06-19 | Nippon Steel Corp | Steel for structure purpose excellent in corrosion resistance and corrosion fatigue resistance and producing method therefor |
| CN1957100A (en) * | 2004-05-24 | 2007-05-02 | 住友金属工业株式会社 | Steel plate excellent in resistance to fatigue crack expansibility and manufacturing method thereof |
| WO2013099179A1 (en) * | 2011-12-27 | 2013-07-04 | Ｊｆｅスチール株式会社 | High strength steel plate having excellent brittle crack arrestability and method for manufacturing same |
| WO2020153085A1 (en) * | 2019-01-23 | 2020-07-30 | Ｊｆｅスチール株式会社 | Thick steel sheet and production method therefor |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2001164334A (en) * | 1999-12-03 | 2001-06-19 | Nippon Steel Corp | Steel for structure purpose excellent in corrosion resistance and corrosion fatigue resistance and producing method therefor |
| CN1957100A (en) * | 2004-05-24 | 2007-05-02 | 住友金属工业株式会社 | Steel plate excellent in resistance to fatigue crack expansibility and manufacturing method thereof |
| WO2013099179A1 (en) * | 2011-12-27 | 2013-07-04 | Ｊｆｅスチール株式会社 | High strength steel plate having excellent brittle crack arrestability and method for manufacturing same |
| WO2020153085A1 (en) * | 2019-01-23 | 2020-07-30 | Ｊｆｅスチール株式会社 | Thick steel sheet and production method therefor |
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Application publication date: 20211022 |