CN111850406A - 380MPa grade high-phosphorus weathering steel and preparation method thereof - Google Patents
380MPa grade high-phosphorus weathering steel and preparation method thereof Download PDFInfo
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- CN111850406A CN111850406A CN202010743939.2A CN202010743939A CN111850406A CN 111850406 A CN111850406 A CN 111850406A CN 202010743939 A CN202010743939 A CN 202010743939A CN 111850406 A CN111850406 A CN 111850406A
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/02—Ferrous alloys, e.g. steel alloys containing silicon
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B1/00—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations
- B21B1/46—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling metal immediately subsequent to continuous casting
- B21B1/463—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling metal immediately subsequent to continuous casting in a continuous process, i.e. the cast not being cut before 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
- 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
- C22C38/002—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
- C22C38/40—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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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
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- Heat Treatment Of Steel (AREA)
- Heat Treatment Of Sheet Steel (AREA)
Abstract
The invention belongs to the technical field of ferrous metallurgy, and particularly relates to 380MPa grade high-phosphorus weathering steel and a preparation method thereof. The invention aims to solve the technical problem of providing 380MPa grade high-phosphorus weathering steel with good corrosion resistance. The chemical components are as follows: c is less than or equal to 0.12%, Si: 0.20-0.60%, 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 380MPa grade high-phosphorus weathering steel reaches 7.20-8.61, is obviously higher than 6.0, realizes excellent atmospheric corrosion resistance of the product, can be widely applied to the fields of buildings, 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 380MPa grade high-phosphorus 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. In order to meet the market demand, it is necessary to develop weathering steel having good corrosion resistance.
Disclosure of Invention
The invention aims to solve the technical problem of providing 380MPa grade high-phosphorus weathering steel with good corrosion resistance.
The invention solves the technical problems by adopting the technical scheme that 380MPa grade high-phosphorus weathering steel is provided. The 380MPa grade high-phosphorus weathering steel comprises the following chemical components in percentage by weight: c is less than or equal to 0.12%, Si: 0.20-0.60%, 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 380MPa grade high-phosphorus weathering steel comprises the following chemical components in percentage by weight: c: 0.06-0.08%, Si: 0.30 to 0.50%, 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.
Further, the atmospheric corrosion resistance index I of the 380MPa grade high-phosphorus weathering steel is 7.20-8.61.
Furthermore, the yield strength of the 380MPa grade high-phosphorus weathering steel is 380-460 MPa, the tensile strength is 520-620 MPa, the elongation A is more than or equal to 18%, and the minus 40 ℃ impact value is more than or equal to 27J.
The invention also provides a preparation method of the 380MPa grade 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 380MPa grade high-phosphorus weathering steel in the fields of buildings, bridge construction or vehicle manufacturing, and bare or light coating in dry areas.
The invention has the beneficial effects that:
the invention provides 380MPa grade high-phosphorus weathering steel with brand-new components, which has the yield strength of 380-460 MPa, the tensile strength of 520-620 MPa, the elongation A of more than or equal to 18 percent and the impact value of more than or equal to 27J at minus 40 ℃. The atmospheric corrosion resistance index I can reach 7.20-8.61, is obviously higher than 6.0, has a corrosion rate of less than or equal to 40% relative to Q355B, has good atmospheric corrosion resistance, low later maintenance cost and long product life, and reduces the full-period use cost; meanwhile, the environmental pollution is reduced, and the accident risk of corrosion failure is reduced. The 380MPa grade high-phosphorus weathering steel can also be used in dry areas for bare or light coating, can be widely used in the fields of buildings, bridge construction or vehicle manufacturing, and has wide application prospect.
Detailed Description
The invention provides 380MPa grade high-phosphorus weathering steel which comprises the following chemical components in percentage by weight: c is less than or equal to 0.12%, Si: 0.20-0.60%, 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 380MPa grade high-phosphorus weathering steel comprises the following chemical components in percentage by weight: c: 0.06-0.08%, Si: 0.30 to 0.50%, 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.
C is an effective strengthening element in steel, improves the carbon content and is beneficial to improving the strength, but too high carbon content can form more large and thick brittle carbide particles in the steel, is unfavorable for plasticity and toughness, can form a segregation zone in the center of a steel plate, is unfavorable for bending performance and formability, and meanwhile, 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%.
Mn has a strong solid solution strengthening effect, can obviously reduce the phase transition temperature of steel, refines the microstructure of the steel, is an important toughening element, but easily produces casting blank cracks in the continuous casting process when the content of Mn is excessive, and simultaneously can reduce the welding performance of the steel. 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.
S can form sulfide inclusions to deteriorate the performance of 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.
Al plays a role in deoxidation when added into steel, 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 be generated. Therefore, the invention designs Als more than or equal to 0.010 percent, and the preferred Als: 0.015-0.050%.
In order to improve the atmospheric corrosion resistance of the weathering steel, after the contents of the elements C, Mn, S and Al are determined, the formula I is 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 of weather structural steel (GB/T4171-2008)2The contents of Si, P, Cu, Cr and Ni in the steel are determined.
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.
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: 0.060 to 0.150%, preferably P: 0.080-0.120%.
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: 0.20-0.80%, preferably Cr: 0.40 to 0.60 percent.
Si has high solid solubility in steel, is beneficial to thinning rust layer tissues and reducing the corrosion rate of the whole steel, and the scale removal is difficult during rolling and the welding performance is reduced due to the over-high content of Si. Therefore, the invention designs Si: 0.20 to 0.60%, preferably Si: 0.30 to 0.50 percent.
Based on the preferable components, the atmospheric corrosion resistance index I of the 380MPa grade high-phosphorus weathering steel can reach 7.20-8.61, the value is more than 6.0, and the excellent atmospheric corrosion resistance of the product is realized.
The corrosion rate of the 380MPa grade high-phosphorus weathering steel relative to Q355B is less than or equal to 40 percent.
The 380MPa grade high-phosphorus weathering steel has the yield strength of 380-460 MPa, the tensile strength of 520-620 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 27J.
The invention also provides a preparation method of the 380MPa grade 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 380MPa grade high-phosphorus weathering steel, parameters are controlled according to the steps in the table 1.
TABLE 1 Main technical measures taken and control objectives in the Steps of the preparation method
In the hot rolling and layer cooling process of the 380MPa grade high-phosphorus weathering steel, a casting blank is hot-charged by hot delivery or is immediately stacked and slowly cooled and is charged in 24 hours, the tapping temperature is 1210-1250 ℃, the rough rolling full-length descaling is carried out, the finish rolling start 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.
The following examples and comparative examples further illustrate specific embodiments of the present invention.
Examples and comparative examples
380MPa grade high-phosphorus weathering steel is prepared by adopting conventional smelting and controlled rolling and controlled cooling processes, and specific components and atmospheric corrosion resistance of 380MPa grade high-phosphorus weathering steel and comparative example 1 (common weathering steel Q450NQR1) and comparative example 2 (low-alloy high-strength steel Q355B) are shown in Table 2 according to corrosion resistance of Q355B detected by 'periodic infiltration corrosion test method for weathering steel for railways' TB/T2375.
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 380MPa grade 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 dry areas, reduces coating and rust removal cost, reduces failure accidents caused by corrosion, reduces environmental pollution, can be applied to the fields of buildings, bridges, vehicles and the like, and has good application prospect.
Claims (6)
1.380MPa grade high phosphorus weathering steel, its characteristic is: the chemical components by weight percentage are as follows: c is less than or equal to 0.12%, Si: 0.20-0.60%, 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 380MPa grade high-phosphorous weathering steel of claim 1, characterized by: the chemical components by weight percentage are as follows: c: 0.06-0.08%, Si: 0.30 to 0.50%, 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 380MPa grade high phosphorous weathering steel of claim 1 or 2, characterized by: the atmospheric corrosion resistance index I of the 380MPa grade high-phosphorus weathering steel is 7.20-8.61.
4. The 380MPa grade high phosphorus weathering steel according to any of claims 1 to 3, characterized in that: the yield strength of the 380MPa grade high-phosphorus weathering steel is 380-460 MPa, the tensile strength is 520-620 MPa, the elongation A is more than or equal to 18%, and the impact value at minus 40 ℃ is more than or equal to 27J.
5. The method for preparing 380MPa grade high-phosphorus weathering steel according to any of claims 1 to 4, characterized in that: the method comprises the following steps: molten iron desulphurization → converter smelting → LF → RH → slab continuous casting → hot rolling → laminar cooling → coiling.
6. The use of 380MPa grade high phosphorus weathering steel according to any of claims 1 to 4, characterized by: in the fields of building, bridge construction or vehicle manufacturing, the coating is used in bare or light coating in dry areas.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113699449A (en) * | 2021-08-27 | 2021-11-26 | 宝武集团鄂城钢铁有限公司 | Thin-specification single-rolling easy-welding steel plate for atmospheric corrosion resistant bridge and rolling method thereof |
| CN115109997A (en) * | 2022-06-16 | 2022-09-27 | 中船双瑞(洛阳)特种装备股份有限公司 | Acid rain atmospheric corrosion resistant weather-resistant cast steel |
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| CN115109997A (en) * | 2022-06-16 | 2022-09-27 | 中船双瑞(洛阳)特种装备股份有限公司 | Acid rain atmospheric corrosion resistant weather-resistant cast steel |
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