CN111979500A - 500MPa grade high-silicon high-phosphorus weathering steel and preparation method and application thereof - Google Patents
500MPa grade high-silicon high-phosphorus weathering steel and preparation method and application 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
- C22C38/18—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
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
- C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
- C21D8/0221—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the working steps
- C21D8/0226—Hot rolling
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C33/00—Making ferrous alloys
- C22C33/04—Making ferrous alloys by melting
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/002—Ferrous alloys, e.g. steel alloys containing In, Mg, or other elements not provided for in one single group C22C38/001 - C22C38/60
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/04—Ferrous alloys, e.g. steel alloys containing manganese
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/06—Ferrous alloys, e.g. steel alloys containing aluminium
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- 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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Abstract
The invention discloses 500MPa grade high-silicon high-phosphorus weathering steel and a preparation method and application thereof, belonging to the technical field of steel smelting. The invention provides high-silicon high-phosphorus weathering steel with brand new components and good weathering effect, which comprises the following components: c is less than or equal to 0.12%, Si: 2.20-3.00%, Mn is less than or equal to 1.50%, P: 0.060-0.150%, S is less than or equal to 0.015%, Cr: 0.20-0.80%, 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 atmospheric corrosion resistance index I of the high-silicon high-phosphorus weathering steel is as high as 10.62-12.03 and is obviously higher than 6.0, so that the high-silicon high-phosphorus weathering steel realizes excellent atmospheric corrosion resistance of the product, can be used in a bare or light coating mode in a humid area, 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 steel smelting, and particularly relates to 500MPa grade high-silicon high-phosphorus weathering steel and a preparation method and application 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 invention aims to solve the technical problem of developing a new component weathering steel with excellent atmospheric corrosion resistance.
The technical scheme adopted by the invention for solving the technical problems is that firstly, 500MPa grade high-silicon high-phosphorus weathering steel is provided, which comprises the following chemical components in percentage by mass: c is less than or equal to 0.12%, Si: 2.20-3.00%, Mn is less than or equal to 1.50%, P: 0.060-0.150%, S is less than or equal to 0.015%, Cr: 0.20-0.80%, 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 500MPa grade high-silicon high-phosphorus weathering steel comprises the following chemical components in percentage by mass: c: 0.06-0.08%, Si: 2.60-2.80%, Mn: 0.85-1.00%, P: 0.080-0.120%, S is less than or equal to 0.007%, Cr: 0.40-0.60%, 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 500MPa grade high-silicon high-phosphorus weathering steel is 10.62-12.03.
Wherein the corrosion rate of the 500MPa grade high-silicon high-phosphorus weathering steel relative to Q355B is less than or equal to 30 percent.
Wherein the 500MPa grade high-silicon high-phosphorus weathering steel has the yield strength of 500-580 MPa, the tensile strength of 730-830 MPa, the elongation of more than or equal to 18 percent and the impact value of more than or equal to 27J at minus 40 ℃.
The invention also provides a preparation method of the 500MPa grade high-silicon high-phosphorus weathering steel, which comprises the following steps:
molten iron desulphurization → converter smelting → LF → RH → slab continuous casting → hot rolling → laminar cooling → coiling.
The invention also provides application of the 500MPa grade high-silicon high-phosphorus weathering steel in the fields of buildings, bridge construction or vehicle manufacturing, and bare or light coating in wet areas.
The invention has the beneficial effects that:
the invention provides 500MPa grade high-silicon high-phosphorus weathering steel with brand new components, the atmospheric corrosion resistance index I is as high as 10.62-12.03 and is far higher than 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 500MPa grade high-silicon high-phosphorus weathering steel can be used in bare or light coating in humid areas, can be widely used in the fields of buildings, bridge construction or vehicle manufacturing, and has good application value.
Detailed Description
Specifically, the 500MPa grade high-silicon high-phosphorus weathering steel comprises the following chemical components in percentage by mass: c is less than or equal to 0.12%, Si: 2.20-3.00%, Mn is less than or equal to 1.50%, P: 0.060-0.150%, S is less than or equal to 0.015%, Cr: 0.20-0.80%, 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 500MPa grade high-silicon high-phosphorus weathering steel comprises the following chemical components in percentage by mass: c: 0.06-0.08%, Si: 2.60-2.80%, Mn: 0.85-1.00%, P: 0.080-0.120%, S is less than or equal to 0.007%, Cr: 0.40-0.60%, 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 components of the 500MPa grade high-silicon high-phosphorus weathering steel, C is an effective strengthening element in the steel, improves the carbon content, and is favorable for improving the strength, but too high carbon content can form more coarse and brittle carbide particles in the steel, is unfavorable for plasticity and toughness, too high carbon content can form a segregation zone in the center of the steel plate, is unfavorable for bending performance and formability, and too high carbon content increases the welding carbon equivalent, and is unfavorable for welding processing. Therefore, the invention designs that C is less than or equal to 0.12 percent, and the preferable C is: 0.06-0.08%.
In the components of the 500MPa grade high-silicon high-phosphorus 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 excessive, casting blank cracks are easy to generate in the continuous casting process, and 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 500MPa grade high-silicon high-phosphorus 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.
In the components of the 500MPa grade high-silicon high-phosphorus weathering steel, Al is added into the steel to play a role in deoxidation, but the content of Al is too high, and nitrogen oxides are easy to precipitate at austenite grain boundaries to cause casting blank cracks to generate. Therefore, the invention designs Als more than or equal to 0.010 percent, and the preferred Als: 0.015-0.050%.
The contents of Si, P, Cu, Cr and Ni in the steel influence the calculated value of the atmospheric corrosion resistance index I, and the Si, P, Cu, Cr and Ni are main alloy elements for improving the atmospheric corrosion resistance of the steel; therefore, 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, guideline for evaluating the atmospheric corrosion resistance of low alloy steel, of Weathering structural Steel (GB/T4171-2008)2The contents of Si, P, Cu, Cr and Ni in the steel are determined.
In the components of the 500MPa grade high-silicon high-phosphorus weathering steel, Cu is added into the steel, which is beneficial to forming a compact amorphous oxide (alkyl 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.
In the components of the 500MPa grade high-silicon high-phosphorus weathering steel, Ni is added into the steel, so that the corrosion resistance of the steel is obviously improved, meanwhile, Ni and Cu elements form a Cu-rich phase containing Ni, the Cu-rich phase is retained in an external oxidation layer in a solid state, the enrichment amount of Cu in a matrix is reduced, the chance of forming 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.
Among the components of the 500MPa grade high-silicon high-phosphorus weathering steel, Cr has a remarkable effect of improving the passivation capability of steel, can promote the steel surface 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 permeation characteristic of the rust layer to corrosive media. However, too high Cr content increases the production cost. Therefore, the invention designs Cr: 0.20-0.80%, preferably Cr: 0.40 to 0.60 percent.
In the components of the 500MPa grade high-silicon high-phosphorus weathering steel, Si has higher solid solubility in steel, thus being beneficial to refining rust layer tissues and reducing the integral corrosion rate of the steel, and the value I can be obviously improved by high Si content according to a calculation formula of an atmospheric corrosion resistance index I. 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.
In the components of the 500MPa grade high-silicon high-phosphorus weathering steel, P can effectively improve the atmospheric corrosion resistance of the steel, when P and Cu are jointly added into the steel, a better composite effect can be displayed, and according to a calculation formula of an atmospheric corrosion resistance index I, the I value can be obviously improved due to the high P content. However, too high a P content significantly reduces the plasticity and low temperature toughness of the steel. The present invention therefore designs P: 0.060 to 0.150%, preferably 0.080 to 0.120%.
Based on the preferable components, the atmospheric corrosion resistance index I of the 500MPa grade high-silicon high-phosphorus weathering steel can reach 10.62-12.03, and the value is far more than 6.0, so that the excellent atmospheric corrosion resistance of the product is realized.
The corrosion rate of the 500MPa grade high-silicon high-phosphorus weathering steel relative to Q355B is less than or equal to 30 percent.
The 500MPa grade high-silicon high-phosphorus weathering steel has the yield strength of 500-580 MPa, the tensile strength of 730-830 MPa, the elongation of more than or equal to 18 percent and the impact value of more than or equal to 27J at minus 40 ℃.
The invention also provides a preparation method of the 500MPa grade high-silicon high-phosphorus weathering steel, which comprises the following steps:
molten iron desulphurization → converter smelting → LF → RH → slab continuous casting → hot rolling → laminar cooling → coiling.
In the preparation method of the 500MPa grade high-silicon high-phosphorus weathering steel, parameters are controlled in the steps according to the table 1.
TABLE 1 Main technical measures taken in the Steps and control targets
In the hot rolling and layer cooling process of the 500MPa grade high-silicon high-phosphorus weathering steel, the casting blank is hot-charged by hot delivery or immediately stacked and slowly cooled and charged in 24 hours, the tapping temperature is 1240-1280 ℃, the rough rolling full-length full-scale removal is carried out, the finish rolling start temperature is less than or equal to 1020 ℃, the finish rolling finishing temperature is 810-850 ℃, the laminar cooling adopts sparse 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 Fe during rough descaling2SiO4Does not form FeO/Fe when it is in a liquid state2SiO4Easy to remove.
Based on the excellent corrosion resistance of the high-silicon high-phosphorus weathering steel, the invention also provides the application of the 500MPa grade high-silicon high-phosphorus weathering steel, which is used for bare or light coating in the fields of buildings, bridge construction or vehicle manufacturing and in wet areas.
The present invention is further illustrated by the following examples, which are not intended to limit the scope of the invention.
Examples and comparative examples
The smelting and controlled rolling and controlled cooling processes are adopted to prepare 500MPa grade high-silicon high-phosphorus weathering steel, and according to the corrosion resistance of the steel detected by TB/T2375 relative to Q355B, the specific components and the atmospheric corrosion resistance of the high-silicon high-phosphorus weathering steel of the invention and comparative example 1 (common weathering steel Q450NQR1) and comparative example 2 (low-alloy high-strength steel Q355B) are shown in Table 2.
TABLE 2 examples and comparative examples Main Components (/%) and atmospheric Corrosion resistance
The embodiment and the comparative example show that the atmospheric corrosion resistance index I of the 500MPa grade high-silicon high-phosphorus weathering steel exceeds 6.0, is far greater than that of common weathering steel and low-alloy high-strength steel, can realize excellent atmospheric corrosion resistance, can be used in bare or light coating in humid areas, reduces coating and rust removal cost, reduces failure accidents caused by corrosion, reduces environmental pollution, can be used in the fields of building, bridge construction or vehicle manufacturing, and has good application prospect.
Claims (7)
1.500MPa grade high silicon high phosphorus weathering steel, its characteristic is: the paint comprises the following chemical components in percentage by mass: c is less than or equal to 0.12%, Si: 2.20-3.00%, Mn is less than or equal to 1.50%, P: 0.060-0.150%, S is less than or equal to 0.015%, Cr: 0.20-0.80%, 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 500MPa grade high-silicon, high-phosphorus weathering steel of claim 1, characterized by: the paint comprises the following chemical components in percentage by mass: c: 0.06-0.08%, Si: 2.60-2.80%, Mn: 0.85-1.00%, P: 0.080-0.120%, S is less than or equal to 0.007%, Cr: 0.40-0.60%, 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 500MPa grade high-silicon, high-phosphorus weathering steel of claim 2, characterized by: the atmospheric corrosion resistance index I of the 500MPa grade high-silicon high-phosphorus weathering steel is 10.62-12.03.
4. The 500MPa grade high-silicon, high-phosphorus weathering steel of claim 1, characterized by: the corrosion rate of the 500MPa grade high-silicon high-phosphorus weathering steel relative to Q355B is less than or equal to 30 percent.
5. The 500MPa grade high-silicon, high-phosphorus weathering steel of claim 1, characterized by: the 500MPa grade high-silicon high-phosphorus weathering steel has the yield strength of 500-580 MPa, the tensile strength of 730-830 MPa, the elongation of more than or equal to 18 percent and the impact value of more than or equal to 27J at minus 40 ℃.
6. The method for preparing 500MPa grade high-silicon high-phosphorus weathering steel according to any of claims 1 to 5, characterized by comprising the following steps:
molten iron desulphurization → converter smelting → LF → RH → slab continuous casting → hot rolling → laminar cooling → coiling.
7. Use of the 500MPa grade high-silicon high-phosphorus weathering steel according to any of claims 1 to 5, characterized in that: in the fields of building, bridge construction or vehicle manufacturing, the coating is used in bare or light coating in wet areas.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN114686779A (en) * | 2022-04-06 | 2022-07-01 | 攀钢集团攀枝花钢铁研究院有限公司 | High-corrosion-resistance weather-resistant steel and preparation method and application thereof |
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| CN101845599A (en) * | 2009-03-24 | 2010-09-29 | 宝山钢铁股份有限公司 | Weathering steel and manufacturing method thereof |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN101845599A (en) * | 2009-03-24 | 2010-09-29 | 宝山钢铁股份有限公司 | Weathering steel and manufacturing method thereof |
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| JA MEJÍA GÓMEZ等: "Effects of Si as alloying element on corrosion resistance of weathering steel", 《CORROSION SCIENCE》 * |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN114686779A (en) * | 2022-04-06 | 2022-07-01 | 攀钢集团攀枝花钢铁研究院有限公司 | High-corrosion-resistance weather-resistant steel and preparation method and application thereof |
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