CN114959503A - Wear-resistant steel plate and manufacturing method and product thereof - Google Patents
Wear-resistant steel plate and manufacturing method and product thereof Download PDFInfo
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- CN114959503A CN114959503A CN202210769601.3A CN202210769601A CN114959503A CN 114959503 A CN114959503 A CN 114959503A CN 202210769601 A CN202210769601 A CN 202210769601A CN 114959503 A CN114959503 A CN 114959503A
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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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- 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
- C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
- C21D1/18—Hardening; Quenching with or without subsequent tempering
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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
- C21D8/0205—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips of ferrous alloys
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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
- 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
- C21D8/0242—Flattening; Dressing; Flexing
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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
- C21D8/0247—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the heat treatment
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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
- C22C38/04—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
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
- C22C38/44—Ferrous alloys, e.g. steel alloys containing chromium with nickel with molybdenum or tungsten
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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
- C21D2211/00—Microstructure comprising significant phases
- C21D2211/008—Martensite
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/20—Recycling
Abstract
The application provides a wear-resistant steel plate, a manufacturing method thereof and a product, wherein the wear-resistant steel plate comprises the following chemical compositions in percentage by mass: c: 0.1 to 0.25 percent; si: 0.1 to 0.25 percent; mn: 0.3 to 0.5 percent; p: 0 to 0.01 percent; s: 0 to 0.002%; cr: 0.05 percent to 0.1 percent; ni: 0.01 to 0.3 percent; mo: 1% -1.5%; the balance of iron and other inevitable impurities. The wear-resistant steel plate provided by the application still has good wear resistance at 300-600 ℃ by reasonably selecting chemical components and contents.
Description
Technical Field
The application relates to the technical field of production and manufacturing of wear-resistant steel, in particular to a wear-resistant steel plate and a manufacturing method and a product thereof.
Background
The thin-gauge ultrahigh-strength steel plate is a key raw material for manufacturing large-scale engineering equipment and directly determines the service life of the equipment. The large-scale and light-weight engineering equipment increases the strength of the steel plate from 345-700 MPa to 1000-2000 MPa, and provides more challenges for the manufacture of the steel plate.
Along with the rise of the temperature, the dislocation climbing and slipping frequency in the steel material is gradually increased, the dislocation recovery is gradually recovered, and the strength of the steel material is obviously reduced. When the common wear-resistant steel is in service at the temperature of more than 300 ℃, the strength begins to be greatly reduced, the wear resistance is difficult to ensure, and when the temperature reaches 600 ℃, the tensile strength is reduced to be less than 200MPa, so that the common wear-resistant steel is difficult to use.
Disclosure of Invention
The application provides a wear-resistant steel plate and a manufacturing method and application thereof, and aims to solve the problem that the wear-resistant steel plate in the prior art is not wear-resistant when in service at 300-600 ℃.
In a first aspect, the present application provides a wear resistant steel plate having the following chemical composition in mass percent:
c: 0.1% -0.25%, preferably 0.15% -0.25%;
si: 0.1 to 0.25 percent, preferably 0.1 to 0.2 percent;
mn: 0.3 to 0.5 percent, preferably 0.4 to 0.5 percent;
p: 0 to 0.01 percent; preferably 0-0.008%;
s: 0 to 0.002%, preferably 0 to 0.0015%;
cr: 0.05 to 0.1 percent, preferably 0.07 to 0.1 percent;
ni: 0.01 to 0.3 percent, preferably 0.01 to 0.2 percent;
mo: 1 to 1.5 percent, preferably 1.1 to 1.5 percent;
the balance of iron and other inevitable impurities.
According to the technical scheme, by reasonably selecting chemical composition components and content, particularly reasonably selecting the content of Mo (molybdenum) in the wear-resistant steel plate, the solid solution strengthening effect is favorably enhanced, the strength of the steel plate is improved, the ductility and toughness of steel can be improved, the heat strength and hardenability of the steel plate can be improved, and the tempering brittleness is prevented. Therefore, the wear-resistant steel plate provided by the application still has good wear resistance at the temperature of 300-600 ℃.
In some embodiments of the present application, the metallographic structure of the wear resistant steel sheet is martensite.
In some embodiments of the present application, the wear resistant steel plate has a yield strength of 1150 to 1350 MPa;
optionally, the tensile strength of the wear-resistant steel plate is 1350MPa to 1550 MPa;
optionally, the hardness of the wear-resistant steel plate is HBW 430-HBW 500;
optionally, the elongation of the wear-resistant steel plate is 8% -16%;
optionally, the impact energy of the wear-resistant steel plate at the temperature of minus 20 ℃ is 20J-60J.
In some embodiments of the present application, the wear-resistant steel sheet has a tensile strength of 400MPa or more at 300 to 600 ℃.
In a second aspect, the present application provides a method of manufacturing a wear-resistant steel plate, comprising the steps of:
s10: refining a slab having the chemical composition of any of the embodiments described above;
s20: rolling and coiling the plate blank to obtain a steel coil;
s30: and carrying out heat treatment on the steel coil to obtain the wear-resistant steel plate.
In the technical scheme of the application, the manufacturing method is simple in process, and the wear-resistant steel plate manufactured by using the plate blank with specific chemical composition components and content has good wear resistance and still has good wear resistance at 300-600 ℃.
In some embodiments of the present application, the step S10 specifically includes:
s11: providing a raw material having the chemical composition of claim 1;
s12: sequentially smelting, refining and continuously casting the raw materials to obtain a plate blank; wherein the temperature of the argon station is more than or equal to 1530 ℃, the refining time is more than or equal to 45min, the superheat degree range of the tundish is 10-25 ℃, the continuous casting and blank drawing speed is 0.9-1.2 m/min, and the thickness of the plate blank is 220-240 mm.
In some embodiments of the present application, the step S20 specifically includes:
s21: putting the plate blank into a heating furnace to be heated for 150-200 min, wherein the heating furnace comprises a preheating section, a first heating section, a second heating section and a soaking section, and the temperature of the soaking section is 1200-1230 ℃;
s22: carrying out 5-7 times of rough rolling on the plate blank after the heating treatment, wherein the final rough rolling temperature is 1100-1150 ℃;
s23: carrying out finish rolling on the roughly rolled plate blank, wherein the finish rolling temperature is 880-940 ℃;
s24: and cooling and coiling the finish rolled plate blank to obtain a steel coil, wherein the coiling temperature is 550-620 ℃.
In some embodiments of the present application, the step S30 specifically includes:
s31: horizontally cutting the steel coil into single steel plates;
s32: and quenching and tempering the single steel plate to obtain the wear-resistant steel plate.
In some embodiments of the present application, the quenching process comprises: the quenching temperature is 850-920 ℃, and the quenching heat preservation time is 20-50 min;
optionally, the tempering process includes: the tempering temperature is 150-250 ℃, and the tempering heat preservation time is 30-80 min.
In a third aspect, the present application provides an article of manufacture, the method of making comprising the steps of:
providing a wear resistant steel sheet according to any of the above embodiments or manufactured according to the manufacturing method of any of the above embodiments;
and carrying out laser cutting, bending or welding on the wear-resistant steel plate to obtain the product.
In the technical scheme of the application, the wear-resistant steel plate can still keep good wear resistance at 300-600 ℃, so that a product manufactured by the wear-resistant steel plate has good wear resistance at 300-600 ℃.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the application and, together with the description, serve to explain the principles of the application.
FIG. 1 is a metallographic structure diagram of a wear-resistant steel plate NM450HiTemp prepared according to an example of the present application.
Fig. 2 is a graph comparing tensile strengths of a general wear-resistant steel sheet NM450 and a wear-resistant steel sheet NM450HiTemp manufactured in examples of the present application at different temperatures.
FIG. 3 is a graph comparing tensile strengths of a general abrasion resistant steel sheet NM450 and abrasion resistant steel sheets NM450HiTemp manufactured in examples of the present application after heat preservation for 48 hours at different temperatures.
With the above figures, there are shown specific embodiments of the present application, which will be described in more detail below. These drawings and written description are not intended to limit the scope of the inventive concepts in any manner, but rather to illustrate the inventive concepts to those skilled in the art by reference to specific embodiments.
Detailed Description
The examples or embodiments are described in a progressive arrangement throughout this specification, each with emphasis on illustrating differences from the other examples.
In the description of the present specification, references to the description of the terms "one embodiment," "some embodiments," "an illustrative embodiment," "an example," "a specific example," or "some examples" or the like, mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present application. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present application, "plurality" means at least two, e.g., two, three, etc., unless specifically limited otherwise.
The applicant notices that the dislocation climbing and sliding frequency in the steel material is gradually increased along with the increase of the temperature, the dislocation recovery is gradually recovered, and the strength of the steel material is obviously reduced. When the common wear-resistant steel is in service at the temperature of more than 300 ℃, the strength begins to be greatly reduced, the wear resistance is difficult to ensure, and when the temperature reaches 600 ℃, the tensile strength is reduced to be less than 200MPa, so that the common wear-resistant steel is difficult to use.
Based on the problems, the application provides a wear-resistant steel plate which comprises the following chemical compositions in percentage by mass:
c: 0.1% -0.25%, preferably 0.15% -0.25%;
si: 0.1 to 0.25 percent, preferably 0.1 to 0.2 percent;
mn: 0.3 to 0.5 percent, preferably 0.4 to 0.5 percent;
p: 0 to 0.01%, preferably 0 to 0.008%;
s: 0 to 0.002%, preferably 0 to 0.0015%;
cr: 0.05 to 0.1 percent, preferably 0.07 to 0.1 percent;
ni: 0.01 to 0.3 percent, preferably 0.01 to 0.2 percent;
mo: 1 to 1.5 percent, preferably 1.1 to 1.5 percent;
the balance of iron and other inevitable impurities.
The chemical composition and content in the technical scheme of the application are explained in detail below.
The content of C is set in the range of 0.1-0.25%:
carbon (C) largely determines the hardness and strength of steel sheets, and is also a key element determining toughness and hardenability of steel. Meanwhile, the C element also obviously influences the microstructure of the steel, when the carbon content in the steel is not more than 0.25 percent, lath martensite is obtained after quenching, for the steel, the wear resistance is related to the hardness and the toughness, the martensite structure with the highest hardness has the best wear resistance, and the lath martensite has better toughness and wear resistance than the flaky martensite. If the content of C is too high, the steel sheet has high hardness and low toughness, which is disadvantageous to wear resistance; the C content is too low, the hardenability of the steel plate is insufficient, the hardness is too low, and the wear resistance is insufficient. Therefore, in the technical solution of the present application, the C content is set in the range of 0.1% to 0.25%.
In some embodiments of the present application, the C content may also be set at 0.15% to 0.25%.
The Si content is set in the range of 0.1-0.25%:
silicon (Si) has the effect of improving the wear resistance of steel sheets and also has the effect of increasing the tempering stability of steel. Si element mainly exists in a solid solution state in austenite, and can promote the formation of martensite, so that the yield strength of the steel is improved, and the wear resistance of the low-alloy martensite wear-resistant steel is influenced; the addition of Si can influence the diffusion coefficient of carbon atoms in ferrite, and in the tempering process, Si atoms play a role in hindering the movement of C atoms, so that the tempering stability of the steel is improved, and the hardness of the steel plate in a high-temperature environment can be ensured. However, if the Si content is too large, the toughness and ductility of the steel are significantly reduced, and the steel grade also has a massive ferrite structure, which reduces the toughness of the steel and thus the wear resistance. Therefore, in the technical scheme of the application, the content of Si is set to be in the range of 0.1-0.25%.
In some embodiments of the present application, the Si content may also be set at 0.1% to 0.2%.
The Mn content is set within the range of 0.3-0.5%:
manganese (Mn) can reduce the critical cooling rate of steel, increase the hardenability of steel, and thus promote the formation of martensite structure in steel. In addition, the Mn element can also realize the solid solution strengthening effect and the fine grain strengthening effect of the steel, thereby improving the strength and the toughness of the steel. However, Mn is an element which is sensitive to overheating, and when the heating temperature is too high during quenching, grains are coarse; meanwhile, Mn has a large segregation coefficient during solidification, is easy to segregate in a grain boundary, and has adverse effect on the toughness of steel, so that the wear resistance is reduced. The excessive addition of the Mn element is not beneficial to the maintenance of the hardness and the toughness of the steel plate in a high-temperature environment. Therefore, in the technical scheme of the application, the content of Mn is set to be within the range of 0.3-0.5%.
In some embodiments of the present application, the Mn content may also be set at 0.4% to 0.5%.
The content of P is controlled below 0.01 percent and the content of S is controlled below 0.002 percent:
phosphorus (P) and sulfur (S) are two harmful elements in wear-resistant steel, P can cause cold brittleness of the steel, and S causes hot brittleness of the steel; reducing the P and S content increases the metallurgical cost, so the content of both alloying elements is generally controlled to a certain extent. Therefore, in the technical scheme of the application, the content of P is controlled to be less than 0.01 percent and the content of S is controlled to be less than 0.002 percent, so that the influence of P and S on the forming performance is reduced to the lowest possible level.
In some embodiments of the present application, the P content is controlled below 0.008% and the S content is controlled below 0.0015%.
The Cr content is set within the range of 0.05-0.1 percent:
chromium (Cr) is one of the basic elements of the wear-resistant steel, can improve the hardenability of the steel, can greatly improve the hardenability particularly when reasonably matched with Mn and Si elements, and is beneficial to solid solution strengthening and structure refinement of the steel, so that the strength and the toughness of the steel are improved, and the wear resistance of the steel is improved. However, if the Cr content is too high, the temper brittleness of the steel tends to increase, which is not favorable for the steel sheet to maintain its wear resistance in a high temperature environment. Therefore, in the technical scheme of the application, the content of Cr is set to be in the range of 0.05-0.1%.
In some embodiments of the present application, the Cr content may also be set at 0.07% to 0.1%.
The Ni content is set within the range of 0.01-0.3%:
nickel (Ni) is a non-carbide forming element, and can refine the structure of steel, strengthen the matrix, improve the strength of steel without significantly reducing toughness, reduce the overheating sensitivity of steel, improve the hardenability of steel, and do not change the temper brittleness of steel. However, since Ni is expensive and the addition of a large amount of Ni increases the cost of the raw material, the Ni content is set to be in the range of 0.01% to 0.3% in the technical solution of the present application.
In some embodiments of the present application, the Ni content may also be set at 0.01% to 0.2%.
The Mo content is set within the range of 1-1.5 percent:
molybdenum (Mo) can improve hardenability and heat strength of steel, and can refine grains. Mo mainly exists in the form of carbide in steel, can be combined with partial carbide in the steel to form composite carbide, and is dispersedly distributed on a substrate to achieve the strengthening effect; meanwhile, Mo can also refine the as-cast structure, improve the uniformity of the section, improve the tempering stability, strongly inhibit the transformation from austenite to pearlite during heat treatment, stabilize the heat treatment structure and improve the impact toughness, thereby improving the wear resistance of the steel plate under the high-temperature condition. And as the mass fraction of the Mo element is increased, the yield strength and the tensile strength both show an increasing trend. Therefore, in the technical scheme of the application, the content of Mo is set to be in the range of 1-1.5%.
In some embodiments of the present application, the Mo content may also be set at 1.1% to 1.5%.
In the technical scheme of the application, compared with the chemical components and contents of the wear-resistant steel plate in the prior art, the contents of Si, Mn and Cr are obviously reduced, and the content of Mo is increased, because Mn belongs to an overheating sensitive element, and the maintenance of the hardness and the toughness of the steel plate in a high-temperature environment can be influenced by the excessive content of Mn; because the reasonable proportion of Si, Mn and Cr can improve the hardenability of steel and the strength and toughness of the steel, the contents of Si and Cr are correspondingly reduced, the tempering brittleness tendency of the steel is increased due to the excessive content of Cr, and the wear resistance of the steel plate can not be maintained in a high-temperature environment; the proper amount of Ni element can reduce the overheating sensitivity of steel, improve the hardenability of the steel and does not change the temper brittleness of the steel; mo can improve hardenability, heat strength and tempering stability of steel, and when co-existing with elements such as Cr, Mn, etc., it can suppress temper brittleness caused by other elements, so increasing the content of Mo in the steel sheet is advantageous for the steel sheet to maintain good performance in a high temperature environment. On the other hand, in the technical scheme of the application, noble metals such as niobium (Nb), vanadium (V), titanium (Ti) and the like are not added, so that the alloy content and the cost are reduced, and the segregation of alloy elements in the center of the plate blank is reduced; and the content of phosphorus (P) and sulfur (S) in the wear-resistant steel is reasonably controlled, so that manganese sulfide (MnS) inclusions, phosphorus (P) segregation and the like are reduced. Therefore, by reasonably selecting the chemical components and the content, the wear-resistant steel plate provided by the application still has good wear resistance at the temperature of 300-600 ℃.
In some embodiments of the present application, the metallographic structure of the wear resistant steel sheet is martensite.
In some of the above embodiments, as shown in fig. 1, the metallographic structure of the wear-resistant steel plate is martensite, and the martensite has high strength and hardness, so that the wear-resistant steel plate has good wear resistance.
In some embodiments of the application, the yield strength of the wear-resistant steel plate is 1150MPa to 1350MPa, the tensile strength is 1350MPa to 1550MPa, the hardness is HBW430 to HBW500, the elongation is 8 percent to 16 percent, and the impact energy at the temperature of minus 20 ℃ is 20J to 60J.
In the embodiments of the present application, in order to make the wear-resistant steel plate still have good performance in a high-temperature environment, chemical components and contents are selected through a large number of tests, and each performance of the wear-resistant steel plate with the chemical components and contents still meets the relevant standard of the wear-resistant steel plate under a normal temperature condition, and meanwhile, the performance of the wear-resistant steel plate under the high-temperature environment is reduced to a certain extent compared with that under the normal-temperature environment, so that the good performance under the normal-temperature environment is also the basis for maintaining good performance under the high-temperature environment. When the yield strength of the wear-resistant steel plate is 1150-1350 MPa, the tensile strength is 1350-1550 MPa, the hardness is HBW 430-HBW 500, the elongation is 8-16%, and the impact work at-20 ℃ is 20-60J, the wear-resistant steel plate provided by the application still has better wear resistance at 300-600 ℃.
In some embodiments of the present application, the wear resistant steel sheet has a tensile strength of 400MPa or more at 300 ℃ to 600 ℃.
In some embodiments, the tensile strength of the wear-resistant steel plate at 300-600 ℃ is over 400MPa through detection, compared with the prior art that the tensile strength of a common wear-resistant steel plate at 600 ℃ is reduced to be below 200MPa, the performance of the wear-resistant steel plate at 300-600 ℃ provided by the application is obviously superior to that of the common wear-resistant steel plate, and the problem that the wear-resistant steel plate in the prior art is not wear-resistant at 300-600 ℃ can be solved. Therefore, the wear-resistant steel plate provided by the application can meet the requirement of use at the temperature of 300-600 ℃.
In a second aspect, the present application provides a method for manufacturing a wear-resistant steel plate, comprising the steps of:
s10: refining a slab having the chemical composition of any of the embodiments described above;
s20: rolling and coiling the plate blank to obtain a steel coil;
s30: and carrying out heat treatment on the steel coil to obtain the wear-resistant steel plate.
In the technical scheme of the application, the manufacturing method is simple in process, and the wear-resistant steel plate manufactured by using the plate blank with specific chemical composition components and content has good wear resistance and still has good wear resistance at 300-600 ℃.
In some embodiments of the present application, the step S10 specifically includes:
s11: providing a raw material having the chemical composition of claim 1;
s12: sequentially smelting, refining and continuously casting the raw materials to obtain a plate blank; wherein the temperature of the argon station is more than or equal to 1530 ℃, the refining time is more than or equal to 45min, the superheat degree range of the tundish is 10-25 ℃, the continuous casting and blank drawing speed is 0.9-1.2 m/min, and the thickness of the plate blank is 220-240 mm.
In some embodiments, the temperature of the argon station is more than or equal to 1530 ℃, the refining time is more than or equal to 45min, and the conditions can accelerate the uniform molten steel composition and temperature and effectively remove the inclusions; the superheat degree of the tundish is controlled within the range of 10-25 ℃, which is beneficial to limiting the growth of columnar crystals in the solidification process, increasing the nucleation and growth area of isometric crystals and improving the internal strength of the solidified plate blank; the continuous casting and drawing speed is set to be 0.9-1.2 m/min, the slab thickness is 220-240 mm, the reasonable drawing speed and slab thickness ensure high drawing stability, the slab is cooled uniformly, all quality indexes are good, and the surface crack occurrence rate is reduced.
In some embodiments of the present application, the step S20 specifically includes:
s21: putting the plate blank into a heating furnace to be heated for 150-200 min, wherein the heating furnace comprises a preheating section, a first heating section, a second heating section and a soaking section, and the temperature of the soaking section is 1200-1230 ℃;
s22: carrying out 5-7 times of rough rolling on the plate blank after the heating treatment, wherein the final rough rolling temperature is 1100-1150 ℃;
s23: carrying out finish rolling on the roughly rolled plate blank, wherein the finish rolling temperature is 880-940 ℃;
s24: and cooling and coiling the finish-rolled plate blank to obtain a steel coil, wherein the coiling temperature is 550-620 ℃.
In some embodiments, in step S21, the slab is placed in a heating furnace and heated for 150min to 200min, and the temperature of the soaking section is 1200 ℃ to 1230 ℃, which is beneficial to fully heating the slab and preventing austenite grains from being coarse, thereby improving the wear resistance of the steel plate;
in steps S22, S23 and S24, the heated plate blank is subjected to rough rolling, finish rolling, cooling and coiling, the finish rough rolling temperature is controlled to be 1100-1150 ℃, the finish rolling temperature is controlled to be 880-940 ℃, and the coiling temperature is controlled to be 550-620 ℃, so that the microstructure of the steel plate is favorably controlled, the core defect of the continuous casting plate blank is improved, the original austenite grain size of the steel plate is favorably refined, the fracture toughness is improved, the original austenite grain size is refined, the fine grain strengthening effect is also favorable for improving the hardness, and the steel plate has high wear resistance due to high toughness and hardness. Therefore, the control of the rough rolling, the finish rolling, the cooling and the coiling before the heat treatment, and the control of the finish rough rolling temperature, the finish rolling temperature and the coiling temperature are beneficial to improving the wear resistance of the steel plate.
In some embodiments of the present application, the step S30 specifically includes:
s31: horizontally cutting the steel coil into single steel plates;
s32: and quenching and tempering the single steel plate to obtain the wear-resistant steel plate.
In some embodiments, in order to further improve the wear resistance of the steel plate, the steel coil is transversely cut and flattened into a single steel plate, and then the single steel plate is subjected to heat treatment, wherein the heat treatment comprises two processes of quenching and tempering, the quenching can transform the steel structure of the steel plate to a martensite structure, and the martensite structure has quite high strength and certain toughness, so that the single steel plate has good wear resistance, but the martensite in a quenched state is highly unstable, and tempering is needed to improve the performance of the martensite structure. Therefore, after the steel plate is quenched and tempered, the wear resistance of the steel plate is further improved.
In some embodiments of the present application, the quenching process comprises: the quenching temperature is 850-920 ℃, and the quenching heat preservation time is 20-50 min; the tempering process comprises the following steps: the tempering temperature is 150-250 ℃, and the tempering heat preservation time is 30-80 min.
In some embodiments, the quenching temperature is set to 850-920 ℃, and the quenching heat preservation time is set to 20-50 min; the tempering temperature is set to be 150-250 ℃, the tempering heat preservation time is set to be 30-80 min, the quenching temperature is higher than the temperature of complete austenitizing, and the tempering temperature is lower, so that the obtained structures are all martensite structures, but if the quenching temperature is too high, the original austenite grains can be obviously coarsened, the grain boundary structure of lath martensite is changed, the toughness is reduced, and the wear resistance of the steel plate is reduced; in the tempering process, the diffusion of C element and the formation of iron carbide mainly occur, the diffusion of C element can reduce the density of dislocation, thereby reducing the strength and hardness of the steel plate, and the formation of iron carbide, fine carbide can play a role of precipitation strengthening in the initial stage, thereby increasing the strength and hardness of the steel, but the strengthening function is weakened along with the growth of the iron carbide, and the strength and hardness of the steel are adversely affected, so that if the tempering temperature is too high, when cementite appears, the wear resistance of the steel plate can be adversely affected.
In a third aspect, the present application provides an article of manufacture, the method of making comprising the steps of:
providing a wear resistant steel sheet according to any of the above embodiments or manufactured according to the manufacturing method of any of the above embodiments;
and carrying out laser cutting, bending or welding on the wear-resistant steel plate to obtain the product.
In the technical scheme of the application, the wear-resistant steel plate can still keep good wear resistance at 300-600 ℃, so that a product manufactured by the wear-resistant steel plate has good wear resistance at 300-600 ℃.
Hereinafter, the wear-resistant steel sheet and the method for manufacturing the same according to the present invention will be described in more detail with reference to examples, but the present invention is not limited to these examples at all.
Example 1
The production line of the abrasion-resistant steel plate NM450HiTemp in a ripple steel 210 converter plant-2250 hot rolling plate plant-heat treatment plant comprises the following steps:
s11: providing a raw material having a chemical composition as in table 1;
s12: sequentially smelting, refining and continuously casting the raw materials to obtain a plate blank; wherein the temperature of the argon station is 1535 ℃, the refining time is 55min, the superheat degree range of the tundish is 12 ℃, the continuous casting and drawing speed is 1.1m/min, and the thickness of the plate blank is 230 mm;
s21: putting the plate blank into a heating furnace to be heated for 176min, wherein the heating furnace comprises a preheating section, a first heating section, a second heating section and a soaking section, and the temperature of the soaking section is 1220 ℃;
s22: carrying out 7-pass rough rolling on the plate blank subjected to the heating treatment, wherein the final rough rolling temperature is 1135 ℃;
s23: performing finish rolling on the roughly rolled plate blank, wherein the finish rolling temperature is 920 ℃;
s24: cooling and coiling the finish-rolled plate blank to obtain a steel coil with the specification of 10mm multiplied by 2000mm, wherein the coiling temperature is 580 ℃;
s31: transversely cutting and flattening the steel coil into single steel plates with the specification of 10mm multiplied by 2000mm multiplied by 6000 mm;
s32: quenching and tempering a single steel plate to obtain a wear-resistant steel plate NM450HiTemp, wherein the quenching temperature is 900 ℃, and the quenching heat preservation time is 30 min; the tempering temperature is 220 ℃, and the tempering heat preservation time is 40 min.
TABLE 1
| C | Si | Mn | P | S | Cr | Ni | Mo |
| 0.23 | 0.18 | 0.48 | 0.008 | 0.0015 | 0.08 | 0.08 | 1.25 |
Note: c represents the mass content of carbon, in%;
si represents the mass content of silicon in units of%;
mn represents the mass content of manganese in units of%;
p represents the mass content of phosphorus in units of%;
s represents the mass content of sulfur, and the unit is percent;
cr represents the mass content of chromium in%;
ni represents the mass content of nickel, and the unit is%;
mo represents the mass content of molybdenum, and the unit is%;
the balance of iron and other inevitable impurities.
Comparative example 1
The abrasion resistant steel sheet NM450 is produced on the line of the ripple steel 210 converter plant-2250 hot rolling mill-heat treatment plant, and is different from example 1 only in the chemical composition and content of the slab, and the specific chemical composition is shown in table 2.
TABLE 2
| C | Si | Mn | P | S | Ti | Als |
| 0.17 | 0.35 | 1.22 | 0.01 | 0.002 | 0.05 | 0.05 |
Note: c represents the mass content of carbon, in%;
si represents the mass content of silicon in units of%;
mn represents the mass content of manganese in units of%;
p represents the mass content of phosphorus in units of%;
s represents the mass content of sulfur, and the unit is%;
ti represents the mass content of titanium, in%;
als represents the mass content of acid-soluble aluminum, and the unit is percent;
the balance of iron and other inevitable impurities.
Test example 1
The mechanical properties of the wear-resistant steel plate NM450HiTemp produced in example 1 are detected, and the results are shown in the following table 3 according to the requirements of the test method in GB/T228.1-2010.
TABLE 3
As can be seen from the results of table 3, the mechanical properties of the wear-resistant steel sheet NM450HiTemp manufactured in example 1 completely meet the relevant standards for wear-resistant steel sheets.
Test example 2
The tensile strengths of the abrasion resistant steel sheet NM450HiTemp manufactured in example 1 and the tensile strength of the abrasion resistant steel sheet NM450 manufactured in comparative example 1 were measured at 300 to 600 ℃ and the results are shown in FIG. 2.
From the results shown in fig. 2, as the temperature rises, the dislocation recovers gradually due to the gradual increase of the dislocation climb and slip frequency in the steel plate, the tensile strength of the NM450HiTemp and NM450 steel plate decreases to a certain extent, when the temperature is from 300 ℃ to 600 ℃, the tensile strength of the NM450HiTemp decreases from 1580MPa to 468MPa, and decreases 1112MPa, the tensile strength of the NM450 decreases from 1445MPa to 156MPa, and decreases 1289MPa, and compared with the above, the decrease of NM450 is larger, and the tensile strength is smaller at 600 ℃. The reasonable chemical composition and content are selected, so that the heat resistance of the prepared wear-resistant steel plate is better, and the tensile strength is still greater than 400MPa at 600 ℃.
Test example 3
The tensile strength of the wear-resistant steel sheet NM450HiTemp manufactured in example 1 and the tensile strength of the wear-resistant steel sheet NM450 manufactured in comparative example 1 were measured after heat preservation for 48 hours at different temperatures, and the results are shown in fig. 2.
The results show that the tensile strength of NM450HiTemp and NM450 is reduced after the temperature is kept at 500 ℃ for 48h, wherein the tensile strength of NM450 is only 775MPa, and the tensile strength of NM450HiTemp can reach 1212MPa, which shows that NM450HiTemp has better temper brittleness resistance compared with NM450, and the possible reasons are that the content of the heat sensitive element Mn and the element causing temper brittleness is reduced in the chemical composition of NM450HiTemp, and the content of the Mo element is increased to inhibit the temper brittleness caused by other elements, so that NM450HiTemp has better temper brittleness resistance, and the tensile property can be kept well after the temperature is kept at 500 ℃ for 48h, and the wear resistance is good.
In summary, the wear-resistant steel plate provided by the application can still keep higher tensile strength in a high-temperature environment, has better wear resistance, and can be used for manufacturing products used in an environment of 300-600 ℃.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the present application, and not to limit the same; although the present application has been described in detail with reference to the foregoing embodiments, it should be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present application.
Claims (10)
1. The wear-resistant steel plate is characterized by comprising the following chemical compositions in percentage by mass:
c: 0.1% -0.25%, preferably 0.15% -0.25%;
si: 0.1 to 0.25 percent, preferably 0.1 to 0.2 percent;
mn: 0.3% -0.5%, preferably 0.4% -0.5%;
p: 0 to 0.01 percent; preferably 0-0.008%;
s: 0 to 0.002%, preferably 0 to 0.0015%;
cr: 0.05 to 0.1 percent, preferably 0.07 to 0.1 percent;
ni: 0.01 to 0.3 percent, preferably 0.01 to 0.2 percent;
mo: 1 to 1.5 percent, preferably 1.1 to 1.5 percent;
the balance of iron and other inevitable impurities.
2. The wear-resistant steel plate of claim 1, wherein the metallographic structure of the wear-resistant steel plate is martensite.
3. The wear-resistant steel plate according to claim 1 or 2, wherein the yield strength of the wear-resistant steel plate is 1150 to 1350 MPa;
optionally, the tensile strength of the wear-resistant steel plate is 1350MPa to 1550 MPa;
optionally, the hardness of the wear-resistant steel plate is HBW 430-HBW 500;
optionally, the elongation of the wear-resistant steel plate is 8% -16%;
optionally, the impact energy of the wear-resistant steel plate at the temperature of minus 20 ℃ is 20J-60J.
4. The wear-resistant steel sheet according to claim 1 or 2, wherein the tensile strength of the wear-resistant steel sheet at 300 ℃ to 600 ℃ is 400MPa or more.
5. A method of manufacturing a wear resistant steel sheet, the method comprising the steps of:
s10: refining a slab having the chemical composition of claim 1;
s20: rolling and coiling the plate blank to obtain a steel coil;
s30: and carrying out heat treatment on the steel coil to obtain the wear-resistant steel plate.
6. The manufacturing method according to claim 5, wherein the step S10 specifically includes:
s11: providing a raw material having the chemical composition of claim 1;
s12: sequentially smelting, refining and continuously casting the raw materials to obtain a plate blank; wherein the temperature of the argon station is more than or equal to 1530 ℃, the refining time is more than or equal to 45min, the superheat degree range of the tundish is 10-25 ℃, the continuous casting and billet drawing speed is 0.9-1.2 m/min, and the thickness of the plate blank is 220-240 mm.
7. The manufacturing method according to claim 5, wherein the step S20 specifically includes:
s21: putting the plate blank into a heating furnace to be heated for 150-200 min, wherein the heating furnace comprises a preheating section, a first heating section, a second heating section and a soaking section, and the temperature of the soaking section is 1200-1230 ℃;
s22: carrying out 5-7 times of rough rolling on the plate blank subjected to the heating treatment, wherein the final rough rolling temperature is 1100-1150 ℃;
s23: carrying out finish rolling on the roughly rolled plate blank, wherein the finish rolling temperature is 880-940 ℃;
s24: and cooling and coiling the finish-rolled plate blank to obtain a steel coil, wherein the coiling temperature is 550-620 ℃.
8. The manufacturing method according to claim 5, wherein the step S30 specifically includes:
s31: horizontally cutting the steel coil into single steel plates;
s32: and quenching and tempering the single steel plate to obtain the wear-resistant steel plate.
9. The method of manufacturing of claim 8, wherein the quenching process comprises: the quenching temperature is 850-920 ℃, and the quenching heat preservation time is 20-50 min;
optionally, the tempering process includes: the tempering temperature is 150-250 ℃, and the tempering heat preservation time is 30-80 min.
10. An article characterized in that it is prepared by a process comprising the steps of:
providing a wear resistant steel sheet according to any one of claims 1 to 4 or manufactured according to the manufacturing method of any one of claims 5 to 9;
and carrying out laser cutting, bending or welding on the wear-resistant steel plate to obtain the product.
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