CN111549277B - Atmospheric corrosion-resistant martensitic wear-resistant steel plate and manufacturing method thereof - Google Patents
Atmospheric corrosion-resistant martensitic wear-resistant steel plate and manufacturing method thereof Download PDFInfo
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- C21D1/18—Hardening; Quenching with or without subsequent tempering
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- 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
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- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
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- 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
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Abstract
本申请属于钢铁冶金技术领域，尤其涉及一种耐大气腐蚀的马氏体耐磨钢板，以质量百分数计包括0.14wt％≤C≤0.22wt％；0.30wt％≤Si≤0.60wt％；0.30wt％≤Mn≤1.00wt％；0.010wt％≤Ti≤0.020wt％；0.02wt％≤Nb≤0.04wt％；0.50wt％≤Ni≤1.0wt％；0.20wt％≤Cu≤0.50wt％；3.4wt％≤Cr≤4.0wt％；0.0010wt％≤B≤0.0020wt％；0＜S≤0.003wt％；0＜P≤0.012wt％；其余为铁和其他不可避免的杂质，其中，所述耐大气腐蚀的马氏体耐磨钢板可兼顾钢板硬度、塑性、韧性、耐磨性和耐腐蚀性的问题。
The application belongs to the technical field of iron and steel metallurgy, and in particular relates to a martensitic wear-resistant steel plate with resistance to atmospheric corrosion, which in mass percentage includes 0.14wt%≤C≤0.22wt%; 0.30wt%≤Si≤0.60wt%; 0.30wt% %≤Mn≤1.00wt%; 0.010wt%≤Ti≤0.020wt%; 0.02wt%≤Nb≤0.04wt%; 0.50wt%≤Ni≤1.0wt%; 0.20wt%≤Cu≤0.50wt%; 3.4wt% %≤Cr≤4.0wt%; 0.0010wt%≤B≤0.0020wt%; 0<S≤0.003wt%;0<P≤0.012wt%; the rest are iron and other inevitable impurities, wherein the atmospheric resistance The corroded martensitic wear-resistant steel plate can take into account the problems of steel plate hardness, plasticity, toughness, wear resistance and corrosion resistance.
Description
Technical Field
The application belongs to the technical field of steel smelting, and particularly relates to an atmospheric corrosion resistant martensite wear-resistant steel plate and a manufacturing method thereof.
Background
The wear-resistant steel plate is widely used for equipment in the fields of mines, coal mines, metallurgy and the like as common steel for engineering machinery, and the corrosion resistance and the wear resistance of the wear-resistant steel plate are required to be high because the working environment in the fields of mines, coal mines, metallurgy and the like is severe.
However, in order to increase the wear resistance of the steel sheet, the conventional wear-resistant steel sheet is generally manufactured by increasing the carbon content or Ti content, which cannot ensure the corrosion resistance of the steel sheet although increasing the wear resistance of the steel sheet, and which satisfies the requirement for high wear resistance at the expense of hardness, plasticity, or toughness of the steel sheet.
Therefore, how to greatly improve the wear resistance and the corrosion resistance of the steel plate on the premise of not influencing the hardness, the plasticity and the toughness of the steel plate becomes a key technical problem to be solved urgently in the current metallurgy and wear-resistant industries.
Disclosure of Invention
In view of the above, the present invention aims to provide an atmospheric corrosion resistant martensitic wear resistant steel plate and a manufacturing method thereof, so as to solve the problem that the hardness, plasticity, toughness, wear resistance and corrosion resistance of the steel plate cannot be simultaneously considered in the prior art.
In order to achieve the above object, an embodiment of the present invention provides, in one aspect, an atmospheric corrosion resistant martensitic wear-resistant steel sheet, including, by mass: c is between 0.14 and 0.22 percent by weight; si is more than or equal to 0.30 wt% and less than or equal to 0.60 wt%; mn is more than or equal to 0.30 wt% and less than or equal to 1.00 wt%; ti is more than or equal to 0.010 wt% and less than or equal to 0.020 wt%; nb is more than or equal to 0.02 wt% and less than or equal to 0.04 wt%; ni is more than or equal to 0.50 wt% and less than or equal to 1.0 wt%; cu is more than or equal to 0.20 weight percent and less than or equal to 0.50 weight percent; cr is more than or equal to 3.4 wt% and less than or equal to 4.0 wt%; b is more than or equal to 0.0010 wt% and less than or equal to 0.0020 wt%; s is more than 0 and less than or equal to 0.003 weight percent; p is more than 0 and less than or equal to 0.012wt percent; the balance of iron and other inevitable impurities, wherein the atmospheric corrosion resistance index I of the atmospheric corrosion resistance martensite wear-resistant steel plate is 10-15; the calculation formula of the atmospheric corrosion resistance index is as follows:
I＝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)2
wherein, the element symbol in parentheses is the mass percentage of the corresponding element, and the% element symbol represents the mass percentage of the corresponding element multiplied by 100.
Optionally, the martensitic wear-resistant steel plate resistant to atmospheric corrosion comprises, in mass percent: c is between 0.14 and 0.18 percent by weight; si is more than or equal to 0.30 weight percent and less than or equal to 0.50 weight percent; mn is more than or equal to 0.30 wt% and less than or equal to 0.60 wt%; ti is more than or equal to 0.012 wt% and less than or equal to 0.018 wt%; nb is more than or equal to 0.02 wt% and less than or equal to 0.03 wt%; ni is more than or equal to 0.50 wt% and less than or equal to 0.8 wt%; cu is more than or equal to 0.25 weight percent and less than or equal to 0.45 weight percent; cr is more than or equal to 3.5 wt% and less than or equal to 3.8 wt%; b is more than or equal to 0.0015 weight percent and less than or equal to 0.0020 weight percent; s is more than 0 and less than or equal to 0.003 weight percent; p is more than 0 and less than or equal to 0.012wt percent; the balance of iron and other inevitable impurities.
Optionally, the martensitic wear-resistant steel plate resistant to atmospheric corrosion comprises, by mass, C: 0.15 wt%; si: 0.40 wt%; mn: 0.45 wt%; ti: 0.014 wt%; nb: 0.02 wt%; ni: 0.65 wt%; cu: 0.38 wt%; cr: 3.5 wt%; b: 0.0018 wt%; s: 0.001 wt%; p: 0.005 wt%; the balance of iron and other inevitable impurities.
Optionally, the atmospheric corrosion resistant index I of the martensite wear-resistant steel plate resistant to atmospheric corrosion is 12-15.
Optionally, the structure of the martensite wear-resistant steel plate resisting atmospheric corrosion comprises tempered martensite and carbide.
Optionally, the yield strength of the atmospheric corrosion resistant martensite wear-resistant steel plate is 1100 MPa-1300 MPa, the tensile strength is 1300 MPa-1500 MPa, the hardness of the steel plate is HBW 420-480, the elongation is 8% -15%, and the impact energy at-40 ℃ is 27J-70J.
On the other hand, the embodiment of the application provides a manufacturing method of a martensite wear-resistant steel plate with atmospheric corrosion resistance, which specifically comprises the following steps: smelting the molten steel into a plate blank, hot-rolling the plate blank to form a steel coil, and sequentially flattening, quenching and tempering the steel coil to obtain the martensite wear-resistant steel plate with atmospheric corrosion resistance.
Optionally, the smelting molten steel into a slab comprises: and continuously casting the molten steel into a plate blank after KR method desulfurization, converter steelmaking and RH method refining treatment in sequence, wherein the continuous casting step comprises that the continuous casting drawing speed is 0.8-1.3 m/min.
Optionally, the hot rolled slab forming a coil of steel comprises: the method comprises the following steps of sequentially reheating the plate blank, rough rolling, finish rolling and laminar cooling, and then coiling to form a steel coil, wherein the reheating step comprises reheating the plate blank, the heating temperature is 1200-1300 ℃, and the heat preservation time is 20-30 min; and/or
The rough rolling step comprises: the total reduction rate of rough rolling is 75-85%, and the single-pass reduction rate of rough rolling is 15-25%; the surface temperature of the rough rolled plate blank is 1050-1100 ℃; and/or
The finish rolling step comprises: the total reduction rate of finish rolling is 60-80%, and the single-pass reduction rate of finish rolling is 12-20%; the finish rolling temperature of finish rolling is 840-890 ℃; and/or
The laminar cooling step comprises the step that the cooling speed of the laminar cooling is 10-25 ℃/s; and/or
The coiling step comprises the coiling temperature of 560-650 ℃.
Optionally, the quenching step comprises quenching heating at 850-900 ℃ for 20-60 min.
Optionally, the tempering step includes tempering at a temperature of 150-200 ℃ for 30-60 min.
Compared with the prior art, the method has the following beneficial effects:
the martensite wear-resistant steel plate resistant to atmospheric corrosion comprises higher corrosion-resistant elements Cr, Ni and Cu, so that on one hand, the corrosion resistance of the steel plate can be ensured, and the atmospheric corrosion resistance index I can reach more than 10; on the other hand, the higher Cr content can ensure that the steel plate has higher hardness under the condition of relatively lower C content, and the higher Ni content can ensure that the steel plate has better low-temperature impact toughness while having relatively higher strength. And the steel plate has the comprehensive properties of better mechanics, welding, atmospheric corrosion resistance and the like by properly controlling various chemical elements, accurately proportioning components and simple steelmaking, rolling and cooling processes.
The yield strength of the atmospheric corrosion resistant martensite wear-resistant steel plate is 1100 MPa-1300 MPa, the tensile strength is 1300 MPa-1500 MPa, the hardness of the steel plate is HBW 420-480, the elongation is 8% -15%, the impact energy at minus 40 ℃ is 27J-70J, and the service life of the atmospheric corrosion resistant martensite wear-resistant steel plate under the atmospheric corrosion condition can reach more than 2 times of Hardox 450.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed to be used in the embodiments or the prior art descriptions will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without inventive exercise.
Fig. 1 is a metallographic structure diagram of an atmospheric corrosion resistant martensitic wear-resistant steel plate according to an embodiment of the present application.
Fig. 2 is a metallographic structure diagram of a martensitic wear-resistant steel plate resistant to atmospheric corrosion according to another embodiment of the present application.
Detailed Description
In order to make the technical problems, technical solutions and advantageous effects to be solved by the present invention more clearly apparent, the present invention is further described in detail below with reference to the following embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
On the one hand, the embodiment of the application provides a martensite wear-resistant steel plate resistant to atmospheric corrosion.
In the embodiment of the application, the martensite wear-resistant steel plate resisting atmospheric corrosion comprises the following components in percentage by mass: c is between 0.14 and 0.22 percent by weight; si is more than or equal to 0.30 wt% and less than or equal to 0.60 wt%; mn is more than or equal to 0.30 wt% and less than or equal to 1.00 wt%; ti is more than or equal to 0.010 wt% and less than or equal to 0.020 wt%; nb is more than or equal to 0.02 wt% and less than or equal to 0.04 wt%; ni is more than or equal to 0.50 wt% and less than or equal to 1.0 wt%; cu is more than or equal to 0.20 weight percent and less than or equal to 0.50 weight percent; cr is more than or equal to 3.4 wt% and less than or equal to 4.0 wt%; b is more than or equal to 0.0010 wt% and less than or equal to 0.0020 wt%; s is more than 0 and less than or equal to 0.003 weight percent; p is more than 0 and less than or equal to 0.012wt percent; the balance of iron and other inevitable impurities, and the atmospheric corrosion resistant index I of the atmospheric corrosion resistant martensitic wear-resistant steel plate is 10-15.
In one embodiment, the atmospheric corrosion resistant martensitic wear-resistant steel plate has an atmospheric corrosion resistance index I of 10-12.
In one embodiment, the atmospheric corrosion resistant martensite wear-resistant steel plate has an atmospheric corrosion resistance index I of 12-15.
Wherein the calculation formula of the atmospheric corrosion resistance index I is shown as follows,
I＝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)2
wherein, the element symbol in parentheses is the mass percentage of the corresponding element, and the% element symbol represents the mass percentage of the corresponding element multiplied by 100.
In the embodiment of the application, higher corrosion resistant elements Cr, Ni and Cu are added, so that on one hand, the corrosion resistance of the steel plate can be ensured, and the atmospheric corrosion resistance index I can reach more than 10; on the other hand, the higher Cr content can ensure that the steel plate has higher hardness under the condition of relatively lower C content, and the higher Ni content can ensure that the steel plate has better low-temperature impact toughness while having relatively higher strength.
In one embodiment, the martensitic wear-resistant steel plate resistant to atmospheric corrosion comprises, by mass: c is between 0.14 and 0.18 percent by weight; si is more than or equal to 0.30 weight percent and less than or equal to 0.50 weight percent; mn is more than or equal to 0.30 wt% and less than or equal to 0.60 wt%; ti is more than or equal to 0.012 wt% and less than or equal to 0.018 wt%; nb is more than or equal to 0.02 wt% and less than or equal to 0.03 wt%; ni is more than or equal to 0.50 wt% and less than or equal to 0.8 wt%; cu is more than or equal to 0.25 weight percent and less than or equal to 0.45 weight percent; cr is more than or equal to 3.5 wt% and less than or equal to 3.8 wt%; b is more than or equal to 0.0015 weight percent and less than or equal to 0.0020 weight percent; s is more than 0 and less than or equal to 0.003 weight percent; p is more than 0 and less than or equal to 0.012wt percent; the balance of iron and other inevitable impurities.
In one embodiment, the martensitic wear-resistant steel plate resistant to atmospheric corrosion comprises, by mass: c is between 0.15 and 0.16 percent by weight; si is more than or equal to 0.35 wt% and less than or equal to 0.45 wt%; mn is more than or equal to 0.40 weight percent and less than or equal to 0.50 weight percent; ti is more than or equal to 0.013 wt% and less than or equal to 0.015 wt%; nb is more than or equal to 0.02 wt% and less than or equal to 0.25 wt%; ni is more than or equal to 0.6 wt% and less than or equal to 0.7 wt%; cu is more than or equal to 0.35 weight percent and less than or equal to 0.40 weight percent; cr is more than or equal to 3.5 wt% and less than or equal to 3.6 wt%; b is more than or equal to 0.0016 and less than or equal to 0.0018 percent by weight; s is more than 0 and less than or equal to 0.002 wt%; p is more than 0 and less than or equal to 0.010 wt%; the balance of iron and other inevitable impurities.
As a specific example, the martensitic wear-resistant steel plate resistant to atmospheric corrosion comprises, by mass, C: 0.15 wt%; si: 0.40 wt%; mn: 0.45 wt%; ti: 0.014 wt%; nb: 0.02 wt%; ni: 0.65 wt%; cu: 0.38 wt%; cr: 3.5 wt%; b: 0.0018 wt%; s: 0.001 wt%; p: 0.005 wt%; the balance of iron and other inevitable impurities.
In the embodiment of the application, the addition principle of each chemical element is as follows:
c, carbon C: the carbon can improve the hardenability of the steel plate, has strong solid solution strengthening effect, and obviously improves the strength and hardness of the martensite wear-resistant steel plate; however, when the carbon content is too high, the elongation and impact energy performance of the wear-resistant steel plate are reduced, and the welding performance is poor; considering other aspects of mechanical property, processability and the like, the content of C is controlled to be 0.14-0.22 wt% in the examples of the application.
Silicon Si: si element is solid-dissolved in the steel sheet, and has a certain solid-solution strengthening effect, and the strength of the steel sheet can be improved. Too high a Si content inhibits the formation of cementite, while a higher Si content amplifies the formation of ferrite phase. Therefore, the Si content in the examples of the present application is controlled to 0.30 wt% to 0.60 wt%.
Manganese Mn: mn element is a weak carbide-forming element, and is usually dissolved in a steel sheet to exert a solid solution strengthening effect; the high Mn content can increase the cracking tendency of the plate blank, easily form longitudinal cracks and other defects in the plate blank production process, and the low Mn content has small contribution to the strength, so that C element or other precious alloy elements such as Mo element and the like need to be added to ensure the strength of the steel plate. However, the addition of C element deteriorates the weldability of the steel plate, and the addition of other noble elements increases the cost of the steel plate. Therefore, in order to provide a steel sheet with good toughness, the content of the Mn element in the examples of the present application is controlled to be 0.30 wt% to 1.00 wt%.
Titanium Ti: ti is mainly used for fixing N, Ti and N form TiN at high temperature, and TiN can inhibit austenite grains from growing when a plate blank is heated to austenitize. In the hot rolling process, Ti and C are formed in a lower temperature range and TiC, and fine TiC particles are beneficial to improving the low-temperature impact property of the steel plate. However, when the Ti content is too high, coarse square TiN is precipitated, and stress concentrates near TiN particles when the steel plate is stressed, so that the stress becomes a nucleation growth source of micro-cracks, and the fatigue performance of the steel plate is reduced. In summary, the content of Ti element in the embodiment of the present application is controlled to be 0.010 wt% to 0.020 wt%.
Niobium Nb: niobium is a compound forming element of strong carbon and nitrogen, and has a very obvious effect on grain refinement. NbC strain is induced and precipitated in the hot rolling process to hinder recovery and recrystallization of deformed austenite, and the deformed austenite structure rolled in a non-recrystallization area in the finish rolling stage is converted into a fine phase change product during phase change through controlled rolling and controlled cooling, so that the steel has high strength and high toughness, and the proper content fully plays a role in controlling rolling. And the higher Nb content can form coarse NbC precipitation in the tempering process, thereby reducing the low-temperature impact energy of the steel plate. Therefore, in order to control the microstructure and the mechanical property of the steel plate, the content of the Nb element is controlled to be 0.020 wt% to 0.040 wt% in the embodiment of the application.
Chromium Cr: the Cr element and the Fe element can form a continuous solid solution and form a plurality of carbides with the C element. Cr element can replace Fe element in cementite to form M3C, and can form M7C3And M23C6，M3C、M7C3And M23C6These phases can significantly improve the hardness and wear resistance of the steel sheet, and Cr elements and Cr carbides dissolved in the steel improve the strength of the steel sheet. In addition, Cr can obviously improve the corrosion resistance of the steel plate, so the atmospheric corrosion resistance of the steel plate can be obviously improved after high content of Cr is added. However, a higher content of Cr forms coarser carbides, thereby deteriorating the impact properties of the steel sheet. Therefore, in order to ensure the corrosion resistance and strength of the steel plate, the content of Cr element is controlled to be 3.4 wt% to 4.0 wt% in the embodiments of the present application.
Copper Cu: cu is an essential element for improving the corrosion resistance of the steel plate, a compact sulfide film is formed on the surface of the steel plate, the uniform corrosion resistance and the local corrosion resistance of the steel plate can be improved, and the Cu content is higher than 0.2% in order to achieve the corrosion resistance protection effect. However, if the Cu content exceeds 0.5%, hot workability and weldability of the steel deteriorate. Therefore, the content of Cu element in the embodiment of the application is controlled to be 0.20 wt% to 0.50 wt%.
Nickel Ni: ni is also an element for improving corrosion resistance, and is usually used in combination with Cu. In order to achieve the protection effect of corrosion resistance, the Ni content should be more than 0.05%. However, if the Ni content exceeds 2.0%, the effect is saturated, which not only increases the cost but also deteriorates the workability and weldability of the steel sheet. Ni can obviously improve the low-temperature toughness of steel and has favorable effect on impact toughness and ductile-brittle transition temperature, but in consideration of cost factors, the content of Ni element is controlled to be 0.50 wt% -1.0 wt% in the embodiment of the application.
B, boron B: the addition of B element to steel increases the hardenability of the steel sheet, and forms a bainite or martensite structure. When the content of B is high, B atoms are enriched in grain boundaries, so that the bonding energy of the grain boundaries is reduced, and the intergranular fracture can occur under the impact action. Therefore, in the embodiment of the application, the content of the element B is controlled to be 0.0010 wt% to 0.0020 wt%.
P, S, O, N: harmful impurity elements in the steel significantly reduce the ductility and weldability of the steel, and therefore the content of the impurity elements should be reduced as much as possible.
In the embodiment of the application, the combination properties of better mechanics, welding, atmospheric corrosion resistance and the like of the steel plate are obtained by properly controlling the elements, accurately proportioning the components and adopting simple steelmaking, rolling and cooling processes.
The structure of the martensite wear-resistant steel plate resistant to atmospheric corrosion in the embodiment of the application is tempered martensite and a small amount of carbide, wherein the carbide is mainly chromium carbide; the yield strength of the martensite wear-resistant steel plate resistant to atmospheric corrosion is 1100 MPa-1300 MPa, the tensile strength is 1300 MPa-1500 MPa, the hardness of the steel plate is HBW 420-480, the elongation is 8% -15%, the impact energy at minus 40 ℃ is 27J-70J, and the service life of the martensite wear-resistant steel plate resistant to atmospheric corrosion can be more than 2 times of Hardox450 under the atmospheric corrosion condition.
On the other hand, the embodiment of the application provides a manufacturing method of the martensite wear-resistant steel plate with atmospheric corrosion resistance.
In the embodiment of the application, the manufacturing method of the martensite wear-resistant steel plate with atmospheric corrosion resistance comprises the following steps:
s100, smelting molten steel into a plate blank;
the smelting of the molten steel into the plate blank comprises the following steps: and continuously casting the molten steel into a plate blank after KR method desulfurization, converter steelmaking and RH method refining treatment in sequence, wherein the continuous casting step comprises that the continuous casting drawing speed is 0.8-1.3 m/min.
S200, hot rolling the plate blank to form a steel coil;
the hot rolled slab forming a coil of steel includes: the plate blank is sequentially reheated, roughly rolled, finely rolled and cooled by laminar flow, and then coiled to form a steel coil,
the reheating step comprises the steps of feeding continuously cast steel billets into a soaking pit furnace or a heating furnace for heating, and keeping the temperature for 20-30 min after the steel billets are heated to 1200-1300 ℃. The heating temperature and the holding time can homogenize the austenite structure in the billet, the carbides of Nb, Ti and the like in the billet are fully dissolved, and TiN is partially dissolved to prevent the growth of original austenite grains.
The rough rolling step comprises: the heated steel billet is sent into a rough rolling mill group for rough rolling, the rough rolling can be carried out for 5 or 7 passes, the single-pass reduction rate of the rough rolling mill is more than or equal to 15 percent, and the total reduction rate of the steel billet on the rough rolling mill is 75 to 85 percent; the final rolling temperature of rough rolling is 1080 ℃; the steel billet becomes an intermediate billet after rough rolling. Preferably, the single pass reduction of the roughing mill is between 15% and 25%.
The finish rolling step comprises: the intermediate billet is sent into a finishing mill group for finish rolling, the single-pass reduction rate of the finishing mill is more than or equal to 12 percent, and the total reduction rate of the billet on the finishing mill is more than 60 percent; the finish rolling temperature of finish rolling is 840-890 ℃; preferably, the single-pass reduction rate of the finishing mill is 12-20%, and the total reduction rate of the billet on the finishing mill is 60-80%.
The laminar cooling and coiling steps comprise that the intermediate blank after finish rolling can be cooled at a cooling speed of 10 ℃/S-25 ℃/S, and the steel plate is cooled to 560-650 ℃; and coiling the steel plate into a steel coil at the temperature of 560-650 ℃.
S300, sequentially flattening, quenching and tempering the steel coil to obtain the martensite wear-resistant steel plate resistant to atmospheric corrosion.
Stacking and cooling the coil of the coil which is off-line or slowly cooling the coil of the coil to room temperature; then flattening the steel plate at the temperature lower than 70 ℃,
quenching the steel plate after flattening, wherein the quenching heating temperature is 850-900 ℃, and the quenching heat preservation time is 20-60 min; and tempering treatment is carried out after quenching, the tempering temperature is 150-200 ℃, and the tempering heat preservation time is 30-60 min.
And air cooling after tempering and heat preservation.
The invention is further illustrated by the following specific examples:
the components of the atmospheric corrosion resistant martensite wear-resistant steel plates and the comparative examples in the embodiments 1-2 are shown in table 1, the controlled rolling and controlled cooling process parameters are shown in table 2, the mechanical properties are shown in table 3, the periodic infiltration test results are shown in table 4, and the comparative steel type adopts Hardox 450.
TABLE 1
| Component (%) | C | Si | Mn | Ti | Nb | Ni | Cu | Cr | B | S | P |
| Example 1 | 0.16 | 0.40 | 0.45 | 0.014 | 0.02 | 0.65 | 0.38 | 3.5 | 0.0016 | 0.001 | 0.007 |
| Example 2 | 0.16 | 0.50 | 0.50 | 0.018 | 0.03 | 0.70 | 0.45 | 3.5 | 0.0015 | 0.003 | 0.006 |
| Comparative example 1 | 0.18 | 0.49 | 1.20 | 0.004 | 0.016 | 0.08 | 0.01 | 0.62 | 0.0012 | 0.001 | 0.007 |
Examples 1-2 and comparative examples a method of making a steel sheet comprising the steps of:
the steel liquid is desulfurized by KR, then smelted by a 210-ton converter, desulfurized by the KR method, smelted by the converter, refined by an RH method, continuously cast into a plate blank, the plate blank is reheated, roughly rolled, finish rolled, laminar cooled and coiled into a steel coil, the steel coil is sequentially subjected to flattening, quenching and tempering to form the martensite wear-resistant steel plate resistant to atmospheric corrosion, and the martensite wear-resistant steel plate resistant to atmospheric corrosion can be subjected to spray printing, packaging and warehousing.
TABLE 2
The thickness of the martensite wear-resistant steel plate resistant to atmospheric corrosion in the embodiment 1 is 8mm, the metallographic structure diagram of the martensite wear-resistant steel plate is shown in fig. 1, the metallographic structure of the martensite wear-resistant steel plate in fig. 1 comprises a tempered martensite structure and a small amount of carbide, and the wear resistance of the steel plate is high.
The thickness of the martensite wear-resistant steel plate resistant to atmospheric corrosion in the embodiment 2 is 8mm, the metallographic structure diagram of the martensite wear-resistant steel plate is shown in fig. 2, the metallographic structure of the steel plate in fig. 2 comprises a tempered martensite structure and a small amount of carbide, and the wear resistance of the steel plate is high.
The specific mechanical properties of the examples and comparative examples are shown in Table 3.
TABLE 3
The yield strength and the tensile strength of the martensitic wear-resistant steel plates resistant to atmospheric corrosion in the embodiments 1-2 are all more than 1100MPa and more than 1400 MPa. The elongation after fracture is more than 10 percent, and the impact energy at minus 40 ℃ is more than 27J.
Periodic infiltration test: at (1.0. + -. 0.05). times.10-2mol/L NaHSO3And carrying out a periodic soaking experiment for 72 hours in an acid environment with the pH of 4-5, wherein the results are shown in Table 4:
TABLE 4
| Numbering | Hourly weight loss (g m)-2·h) | Relative rate of corrosion |
| Example 1 | 1.949 | 41.44％ |
| Example 2 | 1.904 | 40.48％ |
| Comparative example | 4.703 | 100％ |
As can be seen from Table 4, compared with the comparative example, the relative corrosion rate of the examples 1-2 is less than 50%, the weather resistance is greatly improved, and the relative corrosion rate is less than 50% of Hardox450 of the martensite wear-resistant steel of the same grade. The steel plate in the embodiment 1-2 has the advantages that the atmospheric corrosion resistance is obviously improved while the hardness, the plasticity and the toughness of the steel plate are ensured, and the service life of the steel plate is more than twice of that of Hardox 450.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents and improvements made within the spirit and principle of the present invention are intended to be included within the scope of the present invention.
Claims (9)
1. The atmospheric corrosion resistant martensitic wear-resistant steel plate is characterized by comprising the following components in percentage by mass: c is between 0.14 and 0.22 percent by weight; si is more than or equal to 0.30 wt% and less than or equal to 0.60 wt%; mn is more than or equal to 0.30 wt% and less than or equal to 1.00 wt%; ti is more than or equal to 0.010 wt% and less than or equal to 0.020 wt%; nb is more than or equal to 0.02 wt% and less than or equal to 0.04 wt%; ni is more than or equal to 0.50 wt% and less than or equal to 1.0 wt%; cu is more than or equal to 0.20 weight percent and less than or equal to 0.50 weight percent; cr is more than or equal to 3.4 wt% and less than or equal to 4.0 wt%; b is more than or equal to 0.0010 wt% and less than or equal to 0.0020 wt%; s is more than 0 and less than or equal to 0.003 weight percent; p is more than 0 and less than or equal to 0.012wt percent; the balance of iron and other inevitable impurities, wherein the atmospheric corrosion resistance index I of the atmospheric corrosion resistance martensite wear-resistant steel plate is 10-15; the calculation formula of the atmospheric corrosion resistance index is as follows:
I＝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)2
wherein, the element symbol in the brackets is the mass percent of the corresponding element, the% element symbol represents the mass percent of the corresponding element multiplied by 100,
the yield strength of the martensite wear-resistant steel plate resistant to atmospheric corrosion is 1100 MPa-1300 MPa, the tensile strength is 1300 MPa-1500 MPa, the hardness of the steel plate is HBW 420-480, the elongation is 8% -15%, and the impact energy at minus 40 ℃ is 27J-70J;
the martensite wear-resistant steel plate resistant to atmospheric corrosion is prepared by the following steps: smelting the molten steel into a plate blank, hot-rolling the plate blank to form a steel coil, and sequentially flattening, quenching and tempering the steel coil to obtain the martensite wear-resistant steel plate with atmospheric corrosion resistance.
2. The atmospheric corrosion resistant martensitic wear resistant steel sheet according to claim 1 wherein said atmospheric corrosion resistant martensitic wear resistant steel sheet comprises in weight percent: c is between 0.14 and 0.18 percent by weight; si is more than or equal to 0.30 weight percent and less than or equal to 0.50 weight percent; mn is more than or equal to 0.30 wt% and less than or equal to 0.60 wt%; ti is more than or equal to 0.012 wt% and less than or equal to 0.018 wt%; nb is more than or equal to 0.02 wt% and less than or equal to 0.03 wt%; ni is more than or equal to 0.50 wt% and less than or equal to 0.8 wt%; cu is more than or equal to 0.25 weight percent and less than or equal to 0.45 weight percent; cr is more than or equal to 3.5 wt% and less than or equal to 3.8 wt%; b is more than or equal to 0.0015 weight percent and less than or equal to 0.0020 weight percent; s is more than 0 and less than or equal to 0.003 weight percent; p is more than 0 and less than or equal to 0.012wt percent; the balance of iron and other inevitable impurities.
3. The atmospheric corrosion resistant martensitic wear resistant steel sheet according to claim 1 comprising, in mass percent, C: 0.15 wt%; si: 0.40 wt%; mn: 0.45 wt%; ti: 0.014 wt%; nb: 0.02 wt%; ni: 0.65 wt%; cu: 0.38 wt%; cr: 3.5 wt%; b: 0.0018 wt%; s: 0.001 wt%; p: 0.005 wt%; the balance of iron and other inevitable impurities.
4. The atmospheric corrosion resistant martensitic wear resistant steel sheet as claimed in claim 1 wherein the atmospheric corrosion resistant martensitic wear resistant steel sheet has an atmospheric corrosion resistance index I of 12 to 15.
5. A method of manufacturing an atmospheric corrosion resistant martensitic wear resistant steel sheet as claimed in any one of claims 1 to 4 comprising the steps of: smelting the molten steel into a plate blank, hot-rolling the plate blank to form a steel coil, and sequentially flattening, quenching and tempering the steel coil to obtain the martensite wear-resistant steel plate with atmospheric corrosion resistance.
6. The method of claim 5, wherein the step of smelting the molten steel into a slab comprises: and continuously casting the molten steel into a plate blank after KR method desulfurization, converter steelmaking and RH method refining treatment in sequence, wherein the continuous casting step comprises that the continuous casting drawing speed is 0.8-1.3 m/min, the heating temperature is 1200-1300 ℃, and the heat preservation time is 20-30 min.
7. The method of claim 5, wherein the hot rolled slab is formed into a coil of steel comprising: the method comprises the following steps of sequentially reheating the plate blank, rough rolling, finish rolling and laminar cooling, and then coiling to form a steel coil, wherein the reheating step comprises reheating the plate blank, the heating temperature is 1200-1300 ℃, and the heat preservation time is 20-30 min; and/or
The rough rolling step comprises: the total reduction rate of rough rolling is 75-85%, and the single-pass reduction rate of rough rolling is 15-25%; the surface temperature of the rough rolled plate blank is 1050-1100 ℃; and/or
The finish rolling step comprises: the total reduction rate of finish rolling is 60-80%, and the single-pass reduction rate of finish rolling is 12-20%; the finish rolling temperature of finish rolling is 840-890 ℃; and/or
The laminar cooling step comprises the step that the cooling speed of the laminar cooling is 10-25 ℃/s; and/or
The coiling step comprises the coiling temperature of 560-650 ℃.
8. The method for manufacturing the atmospheric corrosion resistant martensitic wear-resistant steel plate as claimed in claim 5, wherein the step of quenching comprises the steps of quenching heating at 850-900 ℃ and quenching heat preservation for 20-60 min.
9. The method for manufacturing the atmospheric corrosion resistant martensitic wear-resistant steel plate as claimed in claim 5, wherein the tempering step comprises the tempering temperature of 150-200 ℃ and the tempering heat preservation time of 30-60 min.
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