CN111850418A - 630MPa grade high-corrosion-resistance weathering steel and preparation method thereof - Google Patents
630MPa grade high-corrosion-resistance weathering steel and preparation method thereof Download PDFInfo
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/04—Ferrous alloys, e.g. steel alloys containing manganese
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C33/00—Making ferrous alloys
- C22C33/04—Making ferrous alloys by melting
- C22C33/06—Making ferrous alloys by melting using master alloys
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/06—Ferrous alloys, e.g. steel alloys containing aluminium
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- 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
- C22C38/34—Ferrous alloys, e.g. steel alloys containing chromium with more than 1.5% by weight of silicon
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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
- C22C38/18—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
Abstract
The invention belongs to the technical field of ferrous metallurgy, and particularly relates to 630MPa grade high-corrosion-resistance weathering steel and a preparation method thereof. In order to develop a weathering steel with brand new components and good weathering effect, the invention provides a 630MPa grade high-corrosion-resistance weathering steel, which comprises the following chemical components: according to weight percentage, C is less than or equal to 0.12 percent, Si: 2.20-3.00%, Mn is less than or equal to 1.50%, P: 0.005-0.030%, S is less than or equal to 0.015%, Cr: 2.90-3.70%, Ni: 0.10-0.40%, Cu: 0.20-0.60%, Als is more than or equal to 0.010%, and the balance is Fe and inevitable impurities. The invention also provides a preparation method and application of the high-corrosion-resistance weathering steel. The atmospheric corrosion resistance index I of the high-corrosion-resistance weathering steel reaches 13.02-14.13, is obviously higher than 6.0, and the excellent atmospheric corrosion resistance of the product is realized. Meanwhile, the corrosion rate of the alloy relative to Q355B is less than or equal to 25%, the yield strength is 630-690 MPa, the tensile strength is 900-980 MPa, the elongation A is more than or equal to 18%, and the impact value at minus 40 ℃ is more than or equal to 60J, so that the alloy can be used in a hot and humid area in an exposed manner, can be widely applied to the fields of building, bridge construction or vehicle manufacturing, and has good application value.
Description
Technical Field
The invention belongs to the technical field of ferrous metallurgy, and particularly relates to 630MPa grade high-corrosion-resistance weathering steel and a preparation method thereof.
Background
The damage of steel corrosion to various fields of national economy and national defense construction is a common and serious problem. According to statistics, in some industrially developed countries, the economic loss caused by corrosion accounts for 2% -4% of the total value of national economic production, wherein atmospheric corrosion is the main form of steel structure corrosion and accounts for about half of the total corrosion loss. Therefore, the method has great significance for the development of weathering steel. The weathering steel is also named as atmospheric corrosion resistant steel, and is a low alloy steel with good corrosion resistance in the atmosphere. Through a large amount of research at home and abroad, at present, it is generally believed that after long-time exposure to the atmosphere, a layer of compact and good-adhesion oxidation product is generated on the surface of the weathering steel, so that a steel matrix is isolated from external corrosive substances, and the corrosion resistance of the weathering steel is obviously improved. The domestic weathering steel is mainly used for railway vehicles, containers and the like, and in developed countries such as the United states, Japan and the like, the weathering steel is more widely used in the fields of steel structure buildings and municipal facilities in a naked state. In the united states, the largest use of weathering steel is to construct bridges and expand the use of bare forms, with buildings using bare weathering steel reaching over 500. In japan, from 1965, exterior members such as building roofs, blinds, steel ribs, exterior panel lights, and the like have been exposed to weathering steel.
At present, as the application field of weathering steel is continuously expanded, more varieties of weathering steel need to be developed to meet the market demand.
Disclosure of Invention
The technical problem to be solved by the invention is as follows: develops a new weathering steel with new components and good weathering effect.
The technical scheme for solving the technical problems comprises the following steps: provides 630MPa grade high-corrosion-resistance weathering steel. The weathering steel comprises the following chemical components: according to weight percentage, C is less than or equal to 0.12 percent, Si: 2.20-3.00%, Mn is less than or equal to 1.50%, P: 0.005-0.030%, S is less than or equal to 0.015%, Cr: 2.90-3.70%, Ni: 0.10-0.40%, Cu: 0.20-0.60%, Als is more than or equal to 0.010%, and the balance is Fe and inevitable impurities.
Preferably, the 630MPa grade high corrosion and weather resistant steel comprises the following chemical components: c, according to weight percentage: 0.06-0.08%, Si: 2.60-2.80%, Mn: 0.85-1.00%, P: 0.010-0.025%, S is less than or equal to 0.007%, Cr: 3.30-3.50%, Ni: 0.20-0.30%, Cu: 0.28-0.38%, Als: 0.015 to 0.050% and the balance of Fe and inevitable impurities.
Wherein the atmospheric corrosion resistance index I of the 630MPa grade high-corrosion-resistance weathering steel is 13.02-14.13.
Wherein the corrosion rate of the 630MPa grade high-corrosion-resistance weathering steel relative to Q355B is less than or equal to 25 percent.
The 630MPa grade high-corrosion-resistance weathering steel has the yield strength of 630-690 MPa, the tensile strength of 900-980 MPa, the elongation A of more than or equal to 18 percent, and the impact value at minus 40 ℃ of more than or equal to 60J.
The invention also provides a preparation method of the 630MPa grade high-corrosion-resistance weathering steel, which comprises the following steps:
the method comprises the following steps of molten iron desulphurization, converter smelting, LF-RH-LF-slab continuous casting, hot rolling, laminar cooling and coiling.
The invention also provides application of the 630MPa grade high-corrosion-resistance weathering steel in the fields of buildings, bridge construction or vehicle manufacturing, and exposed use in hot and humid areas.
The invention has the beneficial effects that:
the invention provides a high-chromium weathering steel with a brand-new component, the atmospheric corrosion resistance index I of the high-chromium weathering steel reaches 13.02-14.13, the value of the atmospheric corrosion resistance index I is about twice of 6.0, and the excellent atmospheric corrosion resistance of the product is realized. The steel has good atmospheric corrosion resistance, low later maintenance cost and long service life of products, and the full-period use cost is reduced; meanwhile, the environmental pollution is reduced, and the accident risk of corrosion failure is reduced. In addition, the high-corrosion-resistance weather-resistant steel can be used in hot and humid areas in an exposed mode, can be widely applied to the fields of buildings, bridge construction or vehicle manufacturing, and has good application value.
Detailed Description
The invention provides 630MPa grade high-corrosion-resistance weathering steel, which comprises the following chemical components in percentage by weight, C is less than or equal to 0.12%, Si: 2.20-3.00%, Mn is less than or equal to 1.50%, P: 0.005-0.030%, S is less than or equal to 0.015%, Cr: 2.90-3.70%, Ni: 0.10-0.40%, Cu: 0.20-0.60%, Als is more than or equal to 0.010%, and the balance is Fe and inevitable impurities.
Preferably, the 630MPa grade high corrosion and weather resistant steel comprises the following chemical components: c, according to weight percentage: 0.06-0.08%, Si: 2.60-2.80%, Mn: 0.85-1.00%, P: 0.010-0.025%, S is less than or equal to 0.007%, Cr: 3.30-3.50%, Ni: 0.20-0.30%, Cu: 0.28-0.38%, Als: 0.015 to 0.050% and the balance of Fe and inevitable impurities.
Among the above components of the weathering steel, C is an effective strengthening element in steel, and increases carbon content, which is advantageous for improving strength, but too high carbon content may form more coarse and brittle carbide particles in steel, which is disadvantageous for plasticity and toughness, and too high carbon content may form a segregation zone in the center of steel plate, which is disadvantageous for bending property and formability, while too high carbon content increases welding carbon equivalent, which is disadvantageous for welding process. Therefore, the invention designs that C is less than or equal to 0.12 percent, and the preferable C is: 0.06-0.08%.
Among the components of the weathering steel, Mn has a strong solid solution strengthening effect, can obviously reduce the phase transition temperature of the steel, refines the microstructure of the steel, is an important toughening element, but when the Mn content is too much, a casting blank crack is easy to generate in the continuous casting process, and simultaneously, the welding performance of the steel is also reduced. Therefore, the invention designs that Mn is less than or equal to 1.50 percent, and the preferable Mn: 0.85 to 1.00 percent.
In the components of the weathering steel, S can form sulfide inclusion to deteriorate the performance of the steel, and meanwhile, pitting corrosion expansion is easy to form in the corrosion process, and the corrosion performance is adversely affected. Therefore, the invention designs that S is less than or equal to 0.015 percent, and the preferable S is less than or equal to 0.007 percent.
Among the above components of the weathering steel, Al is added to the steel to perform deoxidation, but if the Al content is too high, the nitrogen oxide is easily precipitated at the austenite grain boundary to cause the generation of slab cracks. Therefore, the invention designs Als more than or equal to 0.010 percent, and the preferred Als: 0.015-0.050%.
After the elements C, Mn, S and Al are determined, the invention calculates the formula I as 26.01 (% Cu) +3.88 (% Ni) +1.20 (% Cr) +1.49 (% Si) +17.28 (% P) -7.29 (% Cu) (% Ni) -9.10 (% Ni) (% P) -33.39 (% Cu) based on the atmospheric corrosion resistance index in appendix D, namely, guide for evaluating the atmospheric corrosion resistance of low alloy steel in weather-resistant structural steel (GB/T4171-2008)2The contents of Si, P, Cu, Cr and Ni in the steel are determined.
The atmospheric corrosion resistance index of the invention can reach about twice of the specified value, and the corresponding defects possibly brought by high-content Si and Cr elements are avoided mainly through the mutual matching of high-content Si and Cr elements and smelting, controlled rolling and controlled cooling processes.
The addition of Cu into steel is favorable for forming a compact amorphous oxide (hydrocarbyl oxide) protective layer with good adhesion on the surface of the steel, and the corrosion resistance is obvious. In addition, Cu forms insoluble sulfides with S, thereby counteracting the deleterious effects of S on steel corrosion resistance. However, when the Cu content is too high, the melting point of Cu is low and is lower than the heating temperature of the slab, and the precipitated Cu is accumulated in the austenite grain boundary in a liquid state, and when the precipitated Cu content reaches a certain level, cracks are easily generated during heating or hot rolling. In addition, according to the calculation formula of the atmospheric corrosion resistance index I, the calculated value of the atmospheric corrosion resistance index I is reduced when the Cu content is too small or too large. Therefore, the present invention designs Cu: 0.20-0.60%, preferably Cu: 0.28 to 0.38 percent.
The Ni is added into the steel, so that the corrosion resistance of the steel is obviously improved, meanwhile, a Ni-containing Cu-rich phase is formed by the Ni and Cu elements and is retained in an external oxidation layer in a solid state, the enrichment amount of Cu in a matrix is reduced, the formation opportunity of a liquid Cu-rich phase is reduced, and the hot brittleness defect is avoided, so that the Ni/Cu content in the steel is generally controlled to be more than or equal to 1/2. However, too high Ni increases the adhesion of scale, hot rolling defects are formed on the surface by pressing into steel, Ni is a precious metal, and too high Ni content significantly increases the cost of steel alloy. Therefore, the present invention designs Ni: 0.10-0.40%, preferably Ni: 0.20 to 0.30 percent.
According to the calculation formula of the atmospheric corrosion resistance index I, the I value can be obviously improved by adopting high Si, P and Cr contents, so that excellent atmospheric corrosion resistance is realized.
Si has higher solid solubility in steel, is beneficial to thinning rust layer tissues and reducing the overall corrosion rate of the steel. However, too high Si content makes descaling difficult during rolling and also leads to deterioration of weldability. Therefore, the invention designs Si: 2.20-3.00%, preferably Si: 2.60 to 2.80 percent.
P can effectively improve the atmospheric corrosion resistance of steel, and when P and Cu are jointly added into the steel, a better composite effect can be displayed, but the plasticity and the low-temperature toughness of the steel are obviously reduced when the content of P is too high. The present invention therefore designs P: 0.005 to 0.030%, preferably 0.010 to 0.025%.
Cr has an obvious effect of improving the passivation capability of steel, can promote the surface of the steel to carry out a compact passivation film or a protective rust layer, and the enrichment of Cr in the rust layer can effectively improve the selective permeability of the rust layer to corrosive media. However, too high Cr content increases the production cost. Therefore, the invention designs Cr: 2.90-3.70%, preferably Cr: 3.30 to 3.50 percent.
Based on the preferable components, the atmospheric corrosion resistance index I of the high-corrosion-resistance weathering steel can reach 13.02-14.13, and the value is about twice of 6.0, so that the excellent atmospheric corrosion resistance of the product is realized.
The 630MPa grade high-corrosion-resistance weathering steel has the yield strength of 630-690 MPa, the tensile strength of 900-980 MPa, the elongation A of more than or equal to 18 percent, and the impact value at minus 40 ℃ of more than or equal to 60J.
In the smelting process of the high corrosion-resistant and weather-resistant steel, because the addition amount of the alloy is large, the temperature drop in the process is large, the alloy carburization and heating carburization are large, and the ferrochrome melting effect is poor due to the excessive temperature drop, so that the inserted tube in the RH process is seriously bonded, so that the production requirement of the steel cannot be met by the common converter smelting → LF → RH → plate blank continuous casting mode.
Therefore, the invention also provides a preparation method of the high-corrosion-resistance weathering steel, which comprises the following steps:
the method comprises the following steps of molten iron desulphurization, converter smelting, LF-RH-LF-slab continuous casting, hot rolling, laminar cooling and coiling.
The smelting process of the high corrosion-resistant weathering steel adopts a double LF process, although one LF process is added, the smelting process is bound to increase the production cost, but the smelting process has more advantages in the effective utilization of temperature, carbon components and alloy (the phenomenon of alloy loss caused by the adhesion of an insert pipe is not generated) and the refining sulfur control efficiency, the production risk is reduced to a great extent, and the main technical measures and control targets adopted by the processes are shown in Table 1. The ferrochrome entering the LF procedure for the first time is controlled by reducing the lower limit of the component requirement by 0.15 percent, and because the content of other alloy elements is low and easy to oxidize, the ferrochrome is not prepared when entering the LF for the first time, is primarily prepared after RH decarburization and deoxidation, and is finely adjusted after entering the LF for the second time.
TABLE 1 Main technical measures and control targets taken in the respective procedures
According to the hot rolling and layer cooling process of the high-corrosion-resistance weather-resistant steel, a casting blank is hot-charged by hot delivery or is immediately stacked and slowly cooled, the casting blank is charged in 24 hours, the tapping temperature is 1240-1280 ℃, the rough rolling full-length complete scale removal is carried out, the finish rolling initial temperature is less than or equal to 1020 ℃, the finish rolling temperature is 810-850 ℃, cooling water between frames is completely shut off, sparse cooling is adopted for laminar cooling, and the coiling temperature is 580-620 ℃.
For steel with high alloy content, the casting blank is easy to generate edge crack defects when the stacking time is long and the charging temperature is low, so the casting blank is subjected to hot conveying hot charging or is immediately stacked for slow cooling and is charged in 24 hours.
Iron olivine (Fe) is formed between the iron oxide skin and the matrix during long-term heating of the steel containing higher silicon in the furnace2SiO4) Its melting point is 1173 ℃. An effective method for eliminating or reducing the difficulty of descaling silicon-containing steel is to increase the tapping temperature so that the surface temperature of the slab is higher than that of the slab during rough descalingFe2SiO4Does not form FeO/Fe when it is in a liquid state2SiO4Easy to remove.
Cooling water between the racks is completely closed, so that the rolling speed can be reduced, and the cooling rate is reduced; meanwhile, laminar cooling adopts sparse cooling, and the cooling rate is reduced. Because high Cr steel has high hardenability and a large cooling rate, a martensite structure is easy to appear, and therefore, the toughness and the plasticity of a product are adversely affected.
The method for preparing the high-corrosion-resistance weathering steel is not limited to the method, and the weathering steel with atmospheric corrosion resistance index I larger than 6 can be smelted by adopting other reasonable methods.
The invention also provides application of the high-corrosion-resistance weathering steel in the fields of buildings, bridge construction or vehicle manufacturing, and exposed use in hot and humid areas.
The following examples and comparative examples further describe specific embodiments of the present invention and do not therefore limit the present invention to the scope of the examples described.
Examples and comparative examples
The preparation of the high corrosion-resistant weathering steel is carried out by adopting the conventional smelting and controlled rolling and controlled cooling processes, the corrosion resistance is detected according to 'periodic infiltration corrosion test method of weathering steel for railways' TB/T2375, and the specific components and atmospheric corrosion resistance index I of the high corrosion-resistant weathering steel, a comparative example 1 (common weathering steel Q450NQR1) and a comparative example 2 (low-alloy high-strength steel Q355B) are shown in Table 2.
TABLE 2 examples and comparative examples Main Components (/%) and Corrosion resistance
The embodiment and the comparative example show that the atmospheric corrosion resistance index I of the high-corrosion-resistance weathering steel is about twice of 6.0, and is far greater than that of common weathering steel and low-alloy high-strength steel, so that excellent atmospheric corrosion resistance can be realized, the product can be used in hot and humid areas in a naked mode, the coating and rust removal cost is reduced, failure accidents caused by corrosion are reduced, meanwhile, environmental pollution is reduced, and the high-corrosion-resistance weathering steel has a good application prospect.
Claims (7)
1.630MPa grade high corrosion resistant weathering steel, characterized by, the chemical composition is: according to weight percentage, C is less than or equal to 0.12 percent, Si: 2.20-3.00%, Mn is less than or equal to 1.50%, P: 0.005-0.030%, S is less than or equal to 0.015%, Cr: 2.90-3.70%, Ni: 0.10-0.40%, Cu: 0.20-0.60%, Als is more than or equal to 0.010%, and the balance is Fe and inevitable impurities.
2. The 630MPa grade high corrosion and weathering steel of claim 1, characterized by the chemical composition: c, according to weight percentage: 0.06-0.08%, Si: 2.60-2.80%, Mn: 0.85-1.00%, P: 0.010-0.025%, S is less than or equal to 0.007%, Cr: 3.30-3.50%, Ni: 0.20-0.30%, Cu: 0.28-0.38%, Als: 0.015 to 0.050% and the balance of Fe and inevitable impurities.
3. The 630MPa grade high corrosion resistant weathering steel of claim 1, wherein the atmospheric corrosion resistance index I of the high corrosion resistant weathering steel is 13.02-14.13.
4. The 630MPa grade high corrosion resistant weathering steel of claim 1, wherein the relative Q355B corrosion rate of the high corrosion resistant weathering steel is less than or equal to 25%.
5. The 630MPa grade high corrosion and weather resistant steel as claimed in claim 1, wherein the yield strength of the high corrosion and weather resistant steel is 630-690 MPa, the tensile strength is 900-980 MPa, the elongation A is not less than 18%, and the impact value at-40 ℃ is not less than 60J.
6. The method for preparing 630MPa grade high-corrosion-resistance weathering steel according to any of claims 1 to 5, characterized by comprising the following steps:
the method comprises the following steps of molten iron desulphurization, converter smelting, LF-RH-LF-slab continuous casting, hot rolling, laminar cooling and coiling.
7. Use of the 630MPa grade high corrosion and weather resistant steel according to any one of claims 1 to 5, wherein: the coating is used in the fields of buildings, bridge construction or vehicle manufacturing, and is exposed in hot and humid areas.
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| CN202010749787.7A CN111850418A (en) | 2020-07-30 | 2020-07-30 | 630MPa grade high-corrosion-resistance weathering steel and preparation method thereof |
| JP2021116876A JP7233483B2 (en) | 2020-07-30 | 2021-07-15 | 630 MPa grade high corrosion resistant weathering steel and method for producing the same |
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| CN115896613A (en) * | 2022-10-28 | 2023-04-04 | 武汉钢铁有限公司 | High-strength low-cost weathering steel for photovoltaic support and preparation method and application thereof |
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Application publication date: 20201030 |