CN116288066B - Steel plate for construction in marine environment and production method thereof - Google Patents
Steel plate for construction in marine environment and production method thereof Download PDFInfo
- Publication number
- CN116288066B CN116288066B CN202211611555.0A CN202211611555A CN116288066B CN 116288066 B CN116288066 B CN 116288066B CN 202211611555 A CN202211611555 A CN 202211611555A CN 116288066 B CN116288066 B CN 116288066B
- Authority
- CN
- China
- Prior art keywords
- steel plate
- steel
- less
- temperature
- marine environment
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
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
- C22C38/18—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
- 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
- C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
- C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
- C21D8/0221—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the working steps
- C21D8/0226—Hot rolling
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
- C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
- C21D8/0247—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the heat treatment
- C21D8/0263—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the heat treatment following hot rolling
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/002—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
- C22C38/005—Ferrous alloys, e.g. steel alloys containing rare earths, i.e. Sc, Y, Lanthanides
-
- 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
- C22C38/008—Ferrous alloys, e.g. steel alloys containing tin
-
- 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
- C22C38/44—Ferrous alloys, e.g. steel alloys containing chromium with nickel with molybdenum or tungsten
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
- C22C38/46—Ferrous alloys, e.g. steel alloys containing chromium with nickel with vanadium
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
- C22C38/48—Ferrous alloys, e.g. steel alloys containing chromium with nickel with niobium or tantalum
-
- C—CHEMISTRY; METALLURGY
- 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
- C21D2211/004—Dispersions; Precipitations
-
- 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
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Mechanical Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Heat Treatment Of Steel (AREA)
Abstract
本发明公开了一种海洋环境下建筑用钢板及其生产方法，钢种成分包含C:≤0.02wt％，Si：0.15‑0.3wt％，Mn:0.4‑0.6wt％，V：0.03‑0.05wt％，N：0.008‑0.012wt％，Cu：0.5‑0.8wt％，Ni：1‑2wt％，W：0.05‑0.1wt％，Re：0.01‑0.02wt％，Nb：0.01‑0.02wt％，Cr：1‑1.5wt％，REM：0.03‑0.05wt％，Sn：0.05‑0.1wt％，Ti：0.001‑0.005wt％，P：0.015‑0.025wt％，S：≤0.005wt％。生产方法包括钢坯冷装入炉温度≤200℃，采用多级加热；开轧温度1110‑1140℃，道次间隔≤6s，道次压下10‑20％，终轧温度910‑950℃，空冷下线后采用堆垛或保温处理，保温调控温度300‑500℃。本发明解决了现有海洋环境下耐候钢抗断性普遍较低、安全性较低以及高强钢不易焊接的问题。The invention discloses a steel plate for construction in a marine environment and a production method thereof. The steel grade comprises C:≤0.02wt%, Si: 0.15-0.3wt%, Mn: 0.4-0.6wt%, V: 0.03-0.05wt%, N: 0.008-0.012wt%, Cu: 0.5-0.8wt%, Ni: 1-2wt%, W: 0.05-0.1wt%, Re: 0.01-0.02wt%, Nb: 0.01-0.02wt%, Cr: 1-1.5wt%, REM: 0.03-0.05wt%, Sn: 0.05-0.1wt%, Ti: 0.001-0.005wt%, P: 0.015-0.025wt%, and S:≤0.005wt%. The production method includes cold charging the steel billet into the furnace at a temperature of ≤200°C, adopting multi-stage heating; the starting rolling temperature is 1110-1140°C, the pass interval is ≤6s, the pass reduction is 10-20%, the final rolling temperature is 910-950°C, and stacking or heat preservation treatment is adopted after air cooling off the line, and the heat preservation temperature is controlled at 300-500°C. The present invention solves the problems of generally low fracture resistance and low safety of weathering steel in the existing marine environment and difficulty in welding of high-strength steel.
Description
Technical Field
The invention belongs to the technical field of metal material preparation, and particularly relates to a steel plate for a building under a marine environment and a production method thereof.
Background
The corrosion of marine steel materials causes economic loss of nearly trillion yuan to the country each year, taking the selection of materials for foundation construction facilities of island reefs in south China as an example, due to the characteristic of extremely strong corrosiveness of the special offshore environment of island reefs in south China, according to the ISO9223 classification standard, the corrosion grade of the materials can reach the highest grade C5 in the areas with high damp and heat, high salt and high irradiation, and compared with other areas, the steel structure construction served in the environment can be corroded seriously too early even if corrosion protection measures are adopted. It is counted that the failure rate of steel structure construction in the south sea area is about 3 times that of other sea areas and about 10 times that of continental areas, and in addition, the safety of the structure is also important for the construction structure (generally, lower yield ratio and fire-resistant function are required). The invention of the iron and steel materials in the environment is mainly focused on the aspect of improving the corrosion resistance of the materials, the application number CN201710075154.0 is the invention patent of the name of ' high corrosion resistance low alloy steel suitable for high-temperature coastal environment ', the corrosion resistance is superior to that of Q235 carbon steel and other weather resistant steels, the invention patent of the name of ' high corrosion resistance low alloy steel suitable for high-temperature coastal environment ', the high alloy component system based on 3.5 percent Ni is adopted, and elements such as Cu, mo and the like are matched for alloying, the cost is higher, the difficulty is brought to the selection of welding materials and the guarantee of the weldability due to higher alloying and carbon equivalent, the application number CN20161097512. X is the invention patent of the name of ' high-strength weather resistant steel suitable for high-humidity and high-temperature marine environment ', the invention patent of the name of ' high-strength weather resistant steel suitable for high-humidity and high-temperature marine environment and the preparation method ', the invention patent of ' is also adopts the high alloy component system based on 3.5 percent Ni, the fracture sensitivity is high, the work is 55J at 30 ℃ and the impact breaking resistance is low, and the corrosion resistance of the material is not greatly improved.
At present, the steel materials cannot solve the structural safety problem required by the building structure. The existing weather-resistant and fire-resistant steel for construction cannot meet the corrosion problem under severe ocean conditions (high salt and high damp heat), such as the patent of application number CN201810558218.7, named as Cu precipitation-enhanced high-strength, fire-resistant and corrosion-resistant steel and a manufacturing method thereof. Therefore, aiming at the building steel under the severe marine service condition, the problems of high cost, low fracture resistance, poor safety, poor weldability and the like exist, and no building structural steel suitable for the severe marine condition exists at present.
Disclosure of Invention
Aiming at the defects of the prior art, the invention aims to provide a steel plate for building under the marine environment and a production method thereof, and solves the problems of low fracture resistance, poor safety and poor weldability of corrosion-resistant steel under the severe marine environment.
In order to solve the problems, the technical scheme adopted by the invention is that the steel plate for the building in the marine environment comprises the following components of C:≤0.02wt％,Si：0.15-0.3wt％,Mn:0.4-0.6wt％,V：0.03-0.05wt％,N：0.008-0.012wt％,Cu：0.5-0.8wt％,Ni：1-2wt％,W：0.05-0.1wt％,Re：0.01-0.02wt％,Nb：0.01-0.02wt％,Cr：1-1.5wt％,REM：0.03-0.05wt％,Sn：0.05-0.1wt％,Ti：0.001-0.005wt％,P：0.015-0.025wt％,S：≤0.005wt％, weight percent of Fe and unavoidable impurities, wherein the average grain size of the steel plate is 18-38 mu m, the steel plate contains 50-60% of bainite and 20-30% of ferrite tissues, the percentage is area percent, V (C, N) or WC, nb (C, N) and Cr 6C、Fe3 C nano phases which are dispersed and separated out with the average size of 20-30nm are contained, the average spacing of the separated phases is 1-2 mu m, the Cu nano phases with the average size of 62-75nm are contained, and the average spacing of the Cu nano phases is 1.5-2 mu m.
Further, the size of V (C, N) or WC, nb (C, N) and Cr6C, fe3C nano-phase which are dispersed and separated is 10-50nm, and the size of Cu nano-phase is 50-100nm.
Further, under the condition of room temperature, the yield strength of the steel plate is 380-420 MPa, the yield ratio is less than or equal to 0.8, the impact energy at-50 ℃ is not less than 150J, the elongation is more than or equal to 20%, and the shrinkage is more than or equal to 70%.
Further, under the condition of 600 ℃ the yield strength of the steel plate is 360-400 MPa, the yield ratio is not more than 0.8, the impact energy at 50 ℃ below zero is not less than 150J, the elongation is not less than 20%, and the area shrinkage is not less than 70%.
Further, the tensile strength of the steel plate welded joint is 495-525 MPa and the impact energy at minus 40 ℃ is not lower than 150J under the condition of 60KJ line energy.
Further, the corrosion rate of the steel plate is less than 0.03g/m 2. H.
The invention relates to a production method of a steel plate for a building in a marine environment, which comprises smelting, continuous casting, billet heating, controlled rolling and off-line treatment, and comprises the following specific contents:
Heating the steel billet, namely, cold charging the steel billet into a furnace at the temperature of less than or equal to 200 ℃, and adopting multi-stage heating, wherein the total time of 600-950 ℃ is controlled to be 0.1-0.2min/mm, the total time of 1180-1200 ℃ is controlled to be less than or equal to 0.1min/mm, and the total time of 1150-1180 ℃ is controlled to be 0.2-0.4min/mm;
The controlled rolling is that high temperature direct rolling is adopted, the initial rolling temperature is 1110-1140 ℃, the pass interval is less than or equal to 6s, the pass average reduction is 10-20%, the final rolling temperature is 910-950 ℃, and the rolled steel plate is subjected to line drawing in an air cooling mode;
and (3) performing off-line treatment, namely performing regulation and control of precipitated phases and internal stress by adopting a stacking or heat preservation treatment mode after the steel plate is subjected to air cooling off-line, wherein the heat preservation regulation and control temperature is 300-500 ℃.
Further, the steel billet is prepared by converter smelting and continuous casting, the steel billet begins to be cooled when the surface temperature of the steel billet is 800-850 ℃, the cooling speed is controlled to be 2-10 ℃ per second, and then stacking treatment or low-temperature heating treatment is adopted, wherein the low-temperature heating temperature is controlled to be 180-200 ℃.
Further, the steel grade is smelted by adopting a converter, the weight percentage of Ti element in molten iron is controlled below 0.005%, and Si and Mn are used for deoxidization.
The steel plate for the building under the marine environment produced according to the scheme has the following beneficial effects:
1. The corrosion resistance of the steel plate is greatly improved through the addition and the synergistic effect of the composite microelements. The 4-year corrosion rate of the field hanging piece of the coast of the south China sea is less than 0.03g/m 2 h, and the corrosion resistance is improved by 32 percent compared with the best 3.5Ni weathering steel system at present.
2. The alloy has good comprehensive mechanical property, structural safety and weldability, the yield strength is 380-420 MPa (room temperature), the yield strength is 360-400 MPa (under 600 ℃), the yield ratio is less than or equal to 0.8, the impact energy at-50 ℃ is not less than 150J, the elongation is more than or equal to 20%, and the surface shrinkage is more than or equal to 70%.
3. Under the condition of 60KJ line energy, the tensile strength of the welding joint can be controlled to be 495-525 MPa, and the impact energy at minus 40 ℃ is more than or equal to 150J.
Detailed Description
The following description of the technical solutions in the embodiments of the present invention will be clear and complete, and it is obvious that the described embodiments are only some embodiments of the present invention, but not all embodiments. All other examples of modifications and alterations will be apparent to those skilled in the art based on the examples herein, and are intended to be within the scope of the invention. It should be understood that the embodiments of the present invention are only used for illustrating the technical effects of the present invention, and are not used for limiting the scope of the present invention.
According to the invention, through the microalloying compound effect of Sn, re, REM, N, cr, V, W and other elements, a low-cost scheme of 360-400MPa low alloy steel with good safety service performance and weldability is developed, and the problems that the existing severe environment weather-resistant steel is generally low in fracture resistance, low in safety, not easy to weld and the like are solved.
The steel composition of the present invention will be described in detail below, and unless otherwise specified, it is shown that the% content of each element is based on weight.
A steel plate for building under marine environment comprises C：≤0.02wt％,Si：0.15-0.3wt％,Mn：0.4-0.6wt％,V：0.03-0.05wt％,N：0.008-0.012wt％,Cu：0.5-0.8wt％,Ni：1-2wt％,W：0.05-0.1wt％,Re：0.01-0.02wt％,Nb：0.01-0.02wt％,Cr：1-1.5wt％,REM：0.03-0.05wt％,Sn：0.05-0.1wt％,Ti：0.001-0.005wt％,P：0.015-0.025wt％,S：≤0.005wt％, weight percent of Fe and unavoidable impurities as the rest.
C:≤0.02wt%
The element C is a main phase change control element which takes 50-60 area percent of bainite and 20-30 area percent of ferrite as a matrix corrosion resistant structure, is an important element for ensuring the strength of steel, and is suitable for promoting the generation of an important micro cathode phase V (C, N) in the invention and controlling the precipitation of Cr massive carbide, thereby indirectly improving the corrosion resistance of steel.
Si:0.15-0.3wt%
The Si element plays a certain role in strengthening, forms surface oxides with Cu and Sn, effectively improves corrosion resistance, and is one of important deoxidizers in the invention, but too high Si can reduce the compactness of a rust layer on the surface of the steel grade, so that the content of Si is controlled to be 0.15-0.3wt%.
Mn:0.4-0.6wt%
Mn element plays a certain role in strengthening, mn can be infinitely dissolved with Fe in an austenitic state under the system of the invention, excessive Mn can reduce the solid solution effect of V, cu and other corrosion resistant elements, the scale and distribution control of the corrosion resistant elements are affected, and in addition, mn is one of important deoxidizers of the invention, so that the content of Mn is controlled to be 0.4-0.6wt%.
Nb:0.01-0.02wt%
The proper amount of Nb is helpful for further improving the toughness of the steel and promoting the corrosion resistance, but too much Nb can reduce the alloying effect of the elements, and the alloying effect needs to be controlled to be 0.01-0.02wt%.
V:0.03-0.05wt%
The V element mainly plays an important role in the toughness and corrosion resistance of steel in a precipitation strengthening mode, the V element mainly forms V (C, N) with C and N in proper proportion, the steel material is a multiphase structure formed by multi-element alloying, so that the control of the proportion of a cathode and an anode in a micro-area is very important, the control of corrosion resistance of a refined, dispersed, uniform and distributed cathode design relative to a complex structural system such as the steel material is very important, on the basis of the V element, the V element mainly comprises 0.03-0.05wt% of trace V, and mainly comprises the element design of the multi-element system, such as Cr and the like which are infinitely dissolved with alpha-Fe, so that the solid dissolving capacity of V is reduced, and the control of a cathode phase is mainly realized, and V (C, N) and Fe 3 C which are dispersed and precipitated in the matrix of the steel with the average size of 10-50nm (20-30 nm) are generated under the configuration of the elements such as V, C, N and Cr and the like adopted by the invention, and the average spacing of the phases is 1-2 mu m. In addition, the solid-solution V has the function of a compact rust layer, is beneficial to improving the welding process window of steel and improving the welding performance, particularly the toughness, of a heat affected zone after welding. The content of V is 0.03 to 0.05wt% based on the above design.
N:0.008-0.012wt%
The N element mainly promotes the precipitation of V (C, N) and Fe 3 C, and in addition, the solid-dissolved N contributes to improving the corrosion resistance of the steel, so that the N is controlled to be 0.008-0.012wt%.
Cu:0.5-0.8wt%
Cu is an important corrosion-resistant and toughening element of the invention, has the function of a compact rust layer, forms a Cu enrichment layer and an oxidation layer after the surface of a steel plate is primarily corroded, improves the potential of a near-surface matrix and prevents Cl - from invading, in addition, forms a Cu nano phase with the average size of 50-100nm (average size of 62-75 nm) in the steel plate, has the average spacing of 1.5-2 mu m, forms a large number of fine cathode phases after the surface rust layer is damaged, forms a special cathode size and distribution control system with V (C, N) and Fe 3 C, controls the corrosion speed and contributes to improving and controlling the weldability, and excessive Cu is unfavorable for corrosion resistance and increases unnecessary cost, so the Cu is controlled to be 0.5-0.8wt%.
Ni:1-2wt%
The main function of Ni element is to balance the toughness of weathering steel. In the aspect of corrosion resistance, the self-corrosion potential of the steel surface is promoted to move, the invention adopts a low Mn component design, so that Ni can more effectively promote the generation of Fe 3O4 oxide, ni 2+ in a rust layer can more effectively occupy the gap position of Fe 3O4, stable and compact intermetallic compounds of Fe and Ni and an enrichment layer of Ni, sn and V are formed, cl - is prevented from diffusing to a matrix, acidification is reduced, the PH value of electrolyte in the rust layer is improved, thus the corrosion resistance can be fully achieved by only adopting 1-2wt% of Ni, and the strength and plasticity of the material are improved by excessively high Ni.
W:0.05-0.1wt%
W is a dense rust layer, and is dissolved out by the anodic reaction WO 4 2- of the steel, and the WO 4 2- distributed on the rust layer generates ion selection to resist the invasion of Cl - of the corrosion promoter. In addition, W and C generate WC with the wavelength of 10-50nm, which is helpful for improving the low-temperature and high-temperature stability of the dispersed phase of V and Cu and improving the fire resistance of steel. Too high W will deteriorate toughness, and thus is controlled to 0.05 to 0.1wt%.
Re:0.01-0.02wt%
The rhenium element is uniformly distributed between dendrite stems and dendrites in the solidification process, is an important solid solution strengthening element, has the function of a compact rust layer, can effectively improve the fire resistance of steel, has the corrosion potential of about 0.3V, can enable the corrosion potential to positively shift, effectively improves the corrosion potential of a matrix, reduces the corrosion current, and further improves the corrosion resistance of the steel. In addition, the proper amount of Re and Ni and Cu can effectively promote the anode passivation and improve the cathode efficiency, and the anode current in the passivation area is several orders of magnitude smaller than the current of activation dissolution, so that the corrosion resistance of the alloy is effectively improved by utilizing the cathode element. The addition of Re is helpful to improve the low-temperature and high-temperature stability of the dispersed phases of V and Cu, thereby improving the fire resistance of the steel. In addition, the compound addition of Re and V, ni can effectively control the toughness control problem caused by addition of elements such as Sn, and is beneficial to improving the welding process window of steel and improving the welding performance of a heat affected zone after welding, in particular toughness. Thus, the content is controlled to be 0.01-0.02wt%.
Cr:1-1.5wt%
Cr plays a role of a compact rust layer, forms passivation oxide, resists invasion of Cl - together with other oxides and compact alpha-FeOOH on the one hand, has weak alkalinity in the pH value under the condition of high-humidity hot ocean atmospheric environment, can effectively protect the Cr oxide, has the effect of controlling thermodynamic and kinetic changes of V (C, N) indirectly by fully dissolving Cr in ferrite and bainite, is beneficial to improving the fire resistance of materials under an alloy system, and controls Cr in an amount of 1-1.5wt% according to the environment requirement.
REM:0.03-0.05wt%
The REM rare earth element can change the size of cathode phases such as V (C, N) and the like, improve the dispersity, improve the electric potential and reduce the cathode effect, and on the other hand, the REM rare earth element is fully dissolved in the matrix to play a role in improving the electric potential of the matrix to directly generate corrosion resistance, thereby being beneficial to improving the welding process window of steel and improving the welding performance, particularly toughness, of a heat affected zone after welding.
Sn:0.05-0.1wt%
On one hand, sn element reduces the energy level of steel in a simple substance solid solution mode, weakens the electrochemical activity of the steel, is favorable for forming oxides such as SnO and the like to be deposited on the corrosion front, promotes the generation of alpha-FeOOH, and compacts an oxide layer together with the alpha-FeOOH, when the Sn element is dissolved together with Fe, the ionic Sn element can be combined with Cl -, the local PH value is improved, the corrosion process is controlled to be accelerated, and a certain amount of Sn is favorable for maintaining the low-temperature toughness and the improvement of the fire resistance of the steel, but too much Sn element reduces the impact toughness of the material. The Sn of the present invention is controlled to be 0.05-0.1wt% as required by the environment.
Ti:0.001-0.005wt%
Ti element contributes to control of the initial grain size, but too much N element is consumed to affect the strength and corrosion resistance of the steel, for which the Ti of the present invention is controlled to be 0.001-0.005wt%.
P:0.015-0.025wt%
The P element is mainly used for reducing the anodic polarization degree, promoting the uniform dissolution of steel and the oxidation rate of iron, promoting the formation of a non-static protective film, and is matched with Re, cu and the like to resist the invasion of Cl -, but too much P reduces the weldability of the steel, so that the P is controlled to be 0.015-0.025wt%.
S:≤0.005wt%
Sulfide formed by S element accelerates corrosion, and excessive S has adverse effect on toughness of the material, so that strict control is required to be less than or equal to 0.005wt%.
The balance of Fe and unavoidable impurities in the present invention may be Fe and unavoidable impurities in addition to the above-mentioned steel components. Unavoidable impurities cannot be completely removed as impurities which are not artificially mixed in a general steel manufacturing process, and the meaning thereof can be easily understood by those skilled in the art of general steel manufacturing. Moreover, the present invention does not completely exclude the addition of other components in addition to the steel components described above.
The microstructure of the present invention is described in further detail below.
The steel plate for the building under the marine environment comprises 18-38 mu m of average grain size, 50-60% of bainite and 20-30% of ferrite corrosion resistant tissue, wherein the percentage is area percentage, V (C, N)/or WC, nb (C, N) and Cr 6C、Fe3 C nano phases which are dispersed and precipitated are contained, the sizes of the precipitated phases are 10-50nm, the average size is 20-30nm, the average spacing is 1-2 mu m, the dispersed and precipitated Cu nano phases are contained, the sizes are 50-100nm, the average size is 62-75nm, and the average spacing is 1.5-2 mu m. The main purpose is to match the corrosion resistance, fire resistance and mechanical property of the material, and in addition, the precipitation of the disperse phase is beneficial to the uniform corrosion of the matrix.
The production process of the present invention is described in further detail below.
The invention relates to a production method of a steel plate for a building in a marine environment, which comprises smelting, continuous casting, billet heating, controlled rolling and off-line treatment, and comprises the following specific contents:
smelting, namely smelting the steel grade by adopting a converter, deoxidizing by adopting Si and Mn, and strictly controlling the use of Al, wherein the addition of Al consumes N element and has harmful effect on the surface quality of a steel billet, and the similar adopted molten iron is strictly controlled to introduce Ti element (controlled below 0.005 percent) to influence the precipitation effect of V, nb, W and Cu, so that carbonitrides such as Ti, al and the like are avoided, and the corrosion resistance is unfavorable.
In order to control the initial surface grain size of the continuous casting blank and the solid distribution of corrosion resistant elements such as Re, W on the surface layer, the blank is pretreated in a quick cooling mode, the surface temperature of the blank begins to cool at 800-850 ℃, and the cooling speed is controlled at 2-10 ℃ per second. And then, the steel billet is not suitable for hot charging, and stacking treatment or low-temperature heating treatment is needed, wherein the low-temperature heating temperature is controlled to be 180-200 ℃, the surface quality and the thermal stress distribution of the steel billet are controlled, and the initiation and the expansion of cracks and stress cracks on the surface of the steel billet are controlled.
And heating the steel billet, namely controlling the temperature of cold charging of the steel billet into a furnace to be less than or equal to 200 ℃, and adopting multi-stage heating, wherein the total time of 600-950 ℃ is controlled to be 0.1-0.2min/mm, the total time of 1180-1200 ℃ is controlled to be within 0.1min/mm, and the total time of 1150-1180 ℃ is controlled to be 0.2-0.4min/mm. The method aims at controlling the initial distribution of alloy elements, controlling the distribution and composition of crystal grains, especially grain boundaries, and regulating and controlling the mechanical and corrosion resistance performance before hot working.
The rolling is controlled by adopting high-temperature direct rolling, the initial rolling temperature is 1110-1140 ℃, the pass interval is less than or equal to 6s, the average reduction of the pass is 10-20%, and the final rolling temperature is 910-950 ℃. The rolled steel plate is taken off line in an air cooling mode, the grain size is controlled to be 18-38 mu m, 50-60% of bainite and 20-30% of ferrite are formed in the steel as a matrix corrosion resistant structure in the process, and a part of V (C, N) (or WC, nb (C, N)), cr 6C、Fe3 C and a part of Cu nano phase are dispersed and separated.
And (3) performing off-line treatment, namely performing second-stage precipitated phase and internal stress regulation and control by adopting a stacking or heat preservation treatment mode after the steel plate is subjected to air cooling off-line, wherein the heat preservation regulation and control temperature is 300-500 ℃, and V (C, N) (or WC and Nb (C, N)) with the size of 10-50nm (average size of 20-30 nm) and dispersed precipitated nano phases of Cr 6C、Fe3 C are generated in a steel matrix, and the average distance between the phases is 1-2 mu m. Meanwhile, a Cu nano phase with the average size of 62-75nm and 50-100nm also exists in the matrix, and the average distance between the phases is 1.5-2 mu m.
According to the steel grade components and the production process, the actual smelting components of the invention are shown in table 1, the actual process parameters and structures of the invention are shown in tables 2-4, and the physical properties are shown in tables 5-9.
TABLE 1 ingredients per wt% for each example
| C | Si | Mn | V | N | Cu | Ni | W | Re | Cr | REM | Sn | Nb | P | S | Ti | |
| 1 | 0.01 | 0.15 | 0.55 | 0.031 | 0.011 | 0.8 | 1.1 | 0.07 | 0.02 | 1.32 | 0.03 | 0.06 | 0.01 | 0.015 | 0.001 | 0.003 |
| 2 | 0.02 | 0.16 | 0.45 | 0.037 | 0.008 | 0.79 | 1.2 | 0.09 | 0.013 | 1.44 | 0.04 | 0.05 | 0.02 | 0.018 | 0.002 | 0.004 |
| 3 | 0.015 | 0.15 | 0.54 | 0.036 | 0.009 | 0.62 | 1.43 | 0.1 | 0.02 | 1.36 | 0.04 | 0.07 | 0.01 | 0.02 | 0.003 | 0.002 |
| 4 | 0.01 | 0.29 | 0.41 | 0.042 | 0.012 | 0.5 | 2 | 0.08 | 0.02 | 1.5 | 0.05 | 0.09 | 0.02 | 0.025 | 0.002 | 0.005 |
| 5 | 0.02 | 0.2 | 0.43 | 0.05 | 0.009 | 0.55 | 1.9 | 0.09 | 0.02 | 1.1 | 0.04 | 0.1 | 0.02 | 0.02 | 0.003 | 0.003 |
| 6 | 0.005 | 0.17 | 0.42 | 0.032 | 0.008 | 0.63 | 1.75 | 0.08 | 0.02 | 1.27 | 0.05 | 0.1 | 0.01 | 0.024 | 0.002 | 0.004 |
| 7 | 0.02 | 0.18 | 0.41 | 0.04 | 0.009 | 0.67 | 1.82 | 0.05 | 0.019 | 1.33 | 0.03 | 0.05 | 0.02 | 0.016 | 0.002 | 0.003 |
| 8 | 0.02 | 0.25 | 0.45 | 0.032 | 0.01 | 0.73 | 1.22 | 0.07 | 0.02 | 1.46 | 0.03 | 0.09 | 0.01 | 0.022 | 0.003 | 0.002 |
| 9 | 0.01 | 0.20 | 0.59 | 0.041 | 0.008 | 0.69 | 1.34 | 0.09 | 0.014 | 1.47 | 0.04 | 0.06 | 0.02 | 0.02 | 0.001 | 0.001 |
| 10 | 0.005 | 0.16 | 0.56 | 0.032 | 0.012 | 0.75 | 1.56 | 0.1 | 0.02 | 1.5 | 0.03 | 0.1 | 0.02 | 0.017 | 0.003 | 0.004 |
| 11 | 0.005 | 0.17 | 0.46 | 0.035 | 0.011 | 0.63 | 1.72 | 0.09 | 0.012 | 1.45 | 0.03 | 0.1 | 0.01 | 0.019 | 0.002 | 0.005 |
| 12 | 0.01 | 0.22 | 0.55 | 0.04 | 0.012 | 0.77 | 1.21 | 0.06 | 0.017 | 1.3 | 0.03 | 0.08 | 0.02 | 0.022 | 0.001 | 0.003 |
TABLE 2 pretreatment of billets
Table 3 heating process
Table 4 rolling process
TABLE 5 Steel sheet Structure proportion
Table 6 mechanical properties of examples
Table 7 welding performance (line energy 60KJ, submerged arc welding) of examples
Table 8 refractory Properties of examples
Table 9 corrosion resistance of examples
| Average corrosion rate (g/m 2. H) of the coastal hanging piece of the south China sea for 4 years | |
| Comparative example (3.5 Ni series) | 0.037 |
| Example 1 | 0.025 |
| Example 2 | 0.018 |
| Example 3 | 0.024 |
| Example 4 | 0.023 |
| Example 5 | 0.021 |
| Example 6 | 0.022 |
| Example 7 | 0.023 |
| Example 8 | 0.022 |
| Example 9 | 0.024 |
| Example 10 | 0.021 |
| Example 11 | 0.022 |
| Example 12 | 0.021 |
It should be noted that the above embodiments are merely for illustrating the technical solution of the present invention and not for limiting the same, and although the present invention has been described in detail with reference to the above embodiments, it should be understood by those skilled in the art that the technical solution described in the above embodiments may be modified or some or all of the technical features may be equivalently replaced, and these modifications or substitutions do not make the essence of the corresponding technical solution deviate from the scope of the technical solution of the embodiments of the present invention.
Claims (9)
1. A steel plate for building under marine environment is characterized in that steel components comprise C:≤0.02wt％,Si：0.15-0.3wt％,Mn:0.4-0.6wt％,V：0.03-0.05wt％,N：0.008-0.012wt％,Cu：0.5-0.8wt％,Ni：1-2wt％,W：0.05-0.1wt％,Re：0.01-0.02wt％,Nb：0.01-0.02wt％,Cr：1-1.5wt％,REM：0.03-0.05wt％,Sn：0.05-0.1wt％,Ti：0.001-0.005wt％,P：0.015-0.025wt％,S：≤0.005wt％, balance of Fe and unavoidable impurities in percentage by weight, wherein the average grain size of the steel plate is 18-38 mu m, the steel plate contains 50-60% of bainite+20-30% of ferrite structure, the percentage is area percentage, V (C, N) or WC, nb (C, N) and Cr 6C、Fe3 C nano phases which are dispersed and separated out in average size of 20-30nm are contained, the average spacing of the separated phases is 1-2 mu m, the average spacing of the Cu nano phases is 1.5-2 mu m, and the average spacing of the Cu nano phases is 62-75 nm.
2. The steel plate for building under the marine environment according to claim 1, wherein the dispersed V (C, N) or WC, nb (C, N) and Cr 6C、Fe3 C nano-phase has the size of 10-50nm and the Cu nano-phase has the size of 50-100nm.
3. The steel plate for building under the marine environment according to claim 1, wherein the yield strength of the steel plate is 380-420 MPa under the condition of room temperature, the yield ratio is less than or equal to 0.8, the impact energy at-50 ℃ is not less than 150J, the elongation is not less than 20%, and the surface shrinkage is not less than 70%.
4. The steel plate for building under the marine environment according to claim 1, wherein the yield strength of the steel plate under the condition of 600 ℃ is 360-400 MPa, the yield ratio is less than or equal to 0.8, the impact energy at-50 ℃ is not less than 150J, the elongation is not less than 20%, and the surface shrinkage is not less than 70%.
5. The steel plate for building under the marine environment according to claim 1, wherein the tensile strength of the steel plate welded joint under the condition of 60KJ line energy is 495-525 MPa, and the impact energy at-40 ℃ is not lower than 150J.
6. The steel sheet for construction in marine environment according to claim 1, wherein the corrosion rate of the steel sheet is less than 0.03g/m 2. H.
7. A method for producing a steel plate for construction in a marine environment according to any one of claims 1 to 6, comprising the steps of smelting, continuous casting, billet heating, controlled rolling and off-line treatment, and specifically comprising the following steps:
Heating the steel billet, namely, cold charging the steel billet into a furnace at the temperature of less than or equal to 200 ℃, and adopting multi-stage heating, wherein the total time of 600-950 ℃ is controlled to be 0.1-0.2min/mm, the total time of 1180-1200 ℃ is controlled to be less than or equal to 0.1min/mm, and the total time of 1150-1180 ℃ is controlled to be 0.2-0.4min/mm;
The controlled rolling is that high temperature direct rolling is adopted, the initial rolling temperature is 1110-1140 ℃, the pass interval is less than or equal to 6s, the pass average reduction is 10-20%, the final rolling temperature is 910-950 ℃, and the rolled steel plate is subjected to line drawing in an air cooling mode;
and (3) performing off-line treatment, namely performing regulation and control of precipitated phases and internal stress by adopting a stacking or heat preservation treatment mode after the steel plate is subjected to air cooling off-line, wherein the heat preservation regulation and control temperature is 300-500 ℃.
8. The method for producing a steel plate for construction in a marine environment according to claim 7, wherein the billet is produced by converter smelting and continuous casting, the billet surface temperature is started to cool at 800-850 ℃, the cooling rate is controlled to 2-10 ℃ per second, and then stacking treatment or low-temperature heating treatment is adopted, wherein the low-temperature heating temperature is controlled to 180-200 ℃.
9. The method for producing a steel plate for building under marine environment according to claim 7, wherein the steel grade is smelted by a converter, the weight percentage of Ti element in molten iron is controlled below 0.005%, and Si and Mn are used for deoxidization.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211611555.0A CN116288066B (en) | 2022-12-14 | 2022-12-14 | Steel plate for construction in marine environment and production method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211611555.0A CN116288066B (en) | 2022-12-14 | 2022-12-14 | Steel plate for construction in marine environment and production method thereof |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN116288066A CN116288066A (en) | 2023-06-23 |
| CN116288066B true CN116288066B (en) | 2025-03-25 |
Family
ID=86778545
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202211611555.0A Active CN116288066B (en) | 2022-12-14 | 2022-12-14 | Steel plate for construction in marine environment and production method thereof |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN116288066B (en) |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2006118011A (en) * | 2004-10-22 | 2006-05-11 | Sumitomo Metal Ind Ltd | Steel and structures with excellent beach weather resistance |
| CN114959483A (en) * | 2022-06-02 | 2022-08-30 | 武汉钢铁有限公司 | Weathering resistant steel resistant to damp and heat and high in salinity and used in marine atmospheric environment and production method thereof |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103741056B (en) * | 2014-01-26 | 2016-01-06 | 北京科技大学 | A kind of ocean environment of resistance to South Sea production technique of corrosion resistant plate |
-
2022
- 2022-12-14 CN CN202211611555.0A patent/CN116288066B/en active Active
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2006118011A (en) * | 2004-10-22 | 2006-05-11 | Sumitomo Metal Ind Ltd | Steel and structures with excellent beach weather resistance |
| CN114959483A (en) * | 2022-06-02 | 2022-08-30 | 武汉钢铁有限公司 | Weathering resistant steel resistant to damp and heat and high in salinity and used in marine atmospheric environment and production method thereof |
Also Published As
| Publication number | Publication date |
|---|---|
| CN116288066A (en) | 2023-06-23 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| EP4527965A1 (en) | High-strength and high-plasticity hot-rolled strip steel with high weather resistance and manufacturing method therefor | |
| CN102080193A (en) | Structural steel for welding with ultra-great heat input and manufacturing method thereof | |
| CN101153370A (en) | A low-alloy high-strength steel plate that can be welded with large heat input and its manufacturing method | |
| CN106555123A (en) | Corrosion-resistant high-strength-to-yield-ratio anti-seismic reinforcing steel bar and production method thereof | |
| CN113528962A (en) | Corrosion-resistant steel bar and production method of corrosion-resistant steel bar | |
| CN113388775A (en) | Production method of 1000 MPa-grade high-strength steel plate for hydroelectric engineering | |
| WO2024082955A1 (en) | Corrosion-resistant 460 mpa-grade steel plate and production method therefor | |
| CN114908298B (en) | Ocean atmospheric corrosion resistant high-strength steel and production method thereof | |
| CN118639141A (en) | A gigapascal-grade offshore steel plate for extremely cold and ultra-deep environments and a manufacturing method thereof | |
| CN116288066B (en) | Steel plate for construction in marine environment and production method thereof | |
| CN116288064B (en) | Ultra-high strength corrosion-resistant low-temperature marine engineering steel plate and manufacturing method thereof | |
| CN116145049B (en) | Steel plate for marine environment coating and production method thereof | |
| CN116288065B (en) | A lightweight pile coating steel plate and its production method | |
| CN116179969B (en) | Anti-collision steel in marine environment and production method thereof | |
| CN116334476B (en) | Anti-fatigue coating steel plate and production method thereof | |
| CN116219320B (en) | Lightweight pile steel in marine environment and production method thereof | |
| CN116200656B (en) | A coating steel plate with high ductility and production method thereof | |
| CN111549297A (en) | Preparation method of high-strength anti-seismic weather-resistant fire-resistant low-temperature-resistant easily-welded H-shaped steel | |
| CN117144239B (en) | 36 Kg-grade low-yield-ratio offshore wind power steel and production method thereof | |
| CN116162869B (en) | A fatigue-resistant steel plate in marine environment and its production method | |
| CN111154962A (en) | Anti-seismic corrosion-resistant refractory steel and preparation method thereof | |
| CN115976406B (en) | Weather-resistant steel, preparation method thereof and product thereof | |
| CN117165844B (en) | A 42kg-grade low-yield-to-strength ratio high-performance offshore wind power steel and production method | |
| WO2024109880A1 (en) | Nanoprecipitate reinforced ultra-high strength steel and manufacturing method therefor | |
| CN119571208A (en) | Desert climate resistant paint-free weathering steel and preparation method thereof |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |