CN117363995A - Wear-resistant corrosion-resistant composite steel plate and manufacturing method thereof - Google Patents

Wear-resistant corrosion-resistant composite steel plate and manufacturing method thereof Download PDF

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Publication number
CN117363995A
CN117363995A CN202210758732.1A CN202210758732A CN117363995A CN 117363995 A CN117363995 A CN 117363995A CN 202210758732 A CN202210758732 A CN 202210758732A CN 117363995 A CN117363995 A CN 117363995A
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percent
composite
layer
resistant
steel plate
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李红斌
丁建华
焦四海
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Baoshan Iron and Steel Co Ltd
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Baoshan Iron and Steel Co Ltd
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Priority to CN202210758732.1A priority Critical patent/CN117363995A/en
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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
    • C22C38/26—Ferrous alloys, e.g. steel alloys containing chromium with niobium or tantalum
    • 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
    • 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
    • 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
    • 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
    • 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
    • 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
    • C22C38/20—Ferrous alloys, e.g. steel alloys containing chromium with copper
    • 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
    • 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
    • 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
    • C22C38/48—Ferrous alloys, e.g. steel alloys containing chromium with nickel with niobium or tantalum
    • 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
    • C22C38/50—Ferrous alloys, e.g. steel alloys containing chromium with nickel with titanium or zirconium
    • 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
    • C22C38/58—Ferrous alloys, e.g. steel alloys containing chromium with nickel with more than 1.5% by weight of manganese
    • 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
    • C21D2211/001—Austenite
    • 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

Abstract

The invention provides a wear-resistant and corrosion-resistant composite steel plate and a manufacturing method thereof, wherein the wear-resistant and corrosion-resistant composite steel plate comprises a base layer and a composite layer which is composited on the surface of the base layer; the composite layer comprises Fe base and chemical elements with the following mass percentages dispersed in the Fe base: c:0.33% -0.45%, si:0.2 to 0.8 percent, mn:0.4 to 1 percent, P is less than or equal to 0.030 percent, S is less than or equal to 0.010 percent, cr:11% -15%, nb:0.005% -0.05%, al:0.01 to 0.07 percent, cu is less than or equal to 0.3 percent, and Ni is less than or equal to 0.2 percent. The wear-resistant and corrosion-resistant composite steel plate provided by the embodiment of the invention has excellent wear resistance and good impact resistance.

Description

Wear-resistant corrosion-resistant composite steel plate and manufacturing method thereof
Technical Field
The invention relates to the technical field of metallurgy, in particular to a wear-resistant and corrosion-resistant composite steel plate and a manufacturing method thereof.
Background
Wear resistant steel sheets are commonly used in engineering, mining, cement production, harbor, electric and metallurgical machinery where high wear resistance is required under particularly severe working conditions, and wear resistant steel sheets are generally required to have good corrosion resistance.
In the prior art, a steel plate for wear-resistant equipment in a corrosive environment is usually high-grade stainless steel to replace a low-alloy high-strength wear-resistant steel plate, but the high-grade stainless steel has larger noble metal addition amount, high material cost and poor wear-resistant effect.
Disclosure of Invention
In view of the above, the present invention aims to provide a wear-resistant and corrosion-resistant clad steel plate.
The invention also provides a manufacturing method of the wear-resistant and corrosion-resistant composite steel plate.
According to the first aspect, the wear-resistant and corrosion-resistant composite steel plate comprises a base layer and a composite layer composited on the surface of the base layer;
the composite layer comprises Fe base and chemical elements with the following mass percentages dispersed in the Fe base: c:0.33% -0.45%, si:0.2 to 0.8 percent, mn:0.4 to 1 percent, P is less than or equal to 0.030 percent, S is less than or equal to 0.010 percent, cr:11% -15%, nb:0.005% -0.05%, al:0.01 to 0.07 percent, cu is less than or equal to 0.3 percent, and Ni is less than or equal to 0.2 percent.
Further, the base layer comprises a Fe base and the following chemical elements in percentage by mass dispersed in the Fe base: c:0.2 to 0.35 percent, si:0.1 to 0.6 percent, mn:0.6 to 1.6 percent, P is less than or equal to 0.03 percent, S is less than or equal to 0.01 percent, cr:0.1% -1%, nb:0.005% -0.05%, ti:0.005% -0.05%, al:0.01 to 0.06 percent, B:0.001% -0.005%, mo:0.01 to 0.50 percent of Ni:0.01 to 1 percent.
According to another embodiment of the invention, the wear-resistant and corrosion-resistant composite steel plate comprises a base layer and a composite layer composited on the surface of the base layer;
the composite layer comprises the following components in percentage by mass: c:0.33% -0.45%, si:0.2 to 0.8 percent, mn:0.4 to 1 percent, P is less than or equal to 0.030 percent, S is less than or equal to 0.010 percent, cr:11% -15%, nb:0.005% -0.05%, al:0.01 to 0.07 percent, less than or equal to 0.3 percent of Cu, less than or equal to 0.2 percent of Ni, and the balance of Fe and unavoidable impurities.
Further, the base layer comprises the following components in percentage by mass: c:0.2 to 0.35 percent, si:0.1 to 0.6 percent, mn:0.6 to 1.6 percent, P is less than or equal to 0.03 percent, S is less than or equal to 0.01 percent, cr:0.1% -1%, nb:0.005% -0.05%, ti:0.005% -0.05%, al:0.01 to 0.06 percent, B:0.001% -0.005%, mo:0.01 to 0.50 percent of Ni:0.01% -1%, and the balance of Fe and unavoidable impurities.
Further, the composite layer comprises a first composite layer positioned on one side surface of the base layer.
Further, the composite layer also comprises a second composite layer positioned on the other side surface of the base layer, wherein the components and/or the thicknesses of the first composite layer and the second composite layer are mutually independent.
Further, the first composite layer and the second composite layer are continuous casting blanks with the same chemical composition and the same thickness specification.
Further, the Brinell hardness of the base layer is 450HBW or more, and the Rockwell hardness of the composite layer is 50HRC or more.
Further, a method for manufacturing a wear-resistant and corrosion-resistant clad steel plate according to an embodiment of the second aspect of the present invention includes the steps of:
s1, respectively proportioning the components of the base layer and the composite layer in the composite steel plate, smelting and casting to obtain a base layer steel billet and a composite layer steel billet;
s2, sequentially assembling and rolling the base layer steel billet and the composite layer steel billet in the step S1 to obtain a prefabricated steel plate, wherein the rolling reduction is more than or equal to 50%;
and S3, carrying out on-line quenching treatment on the prefabricated steel plate in the step S2 to obtain the composite steel plate.
Further, in the step S2, before the assembling, the rust layer and the oxide layer on each surface to be contacted are removed by machining, and the machining depth is 5mm to 10mm.
Further, the step S2 includes:
s21, forming a plurality of grooves on four sides of the surfaces to be contacted of the base layer steel billet and the composite layer steel billet respectively through machining, forming a plurality of right angle holes at the grooves respectively through machining, and communicating the right angle holes to form a vacuum channel;
s22, aligning the surface to be contacted of the base layer billet in the step S21 with the surface to be relieved of the composite layer billet, and forming a composite billet through seal welding treatment;
s23, vacuumizing the composite blank in the step S22;
s24, plugging a vacuum channel on the composite blank in the step S23;
s25, placing the composite blank in the step S24 into a heating furnace, heating to 1000-1250 ℃, and preserving heat for 1-3 hours;
s26, carrying out vacuum hot rolling on the composite blank in the step S25, wherein in the vacuum hot rolling step, the initial rolling temperature is 1000-1250 ℃, and the final rolling temperature is 850-950 ℃.
Further, in the step S3, the prefabricated steel plate obtained by rolling in the step S2 is quenched to 100-300 ℃ and then tempered, the tempering temperature is 150-350 ℃, the heat preservation time of the tempering temperature is t minutes, the thickness of the composite steel plate is d mm, and the heat preservation time and the thickness of the composite steel plate satisfy the following relation:
t=nd, where n is 2 to 4.
The technical scheme of the invention has at least one of the following beneficial effects:
according to the wear-resistant and corrosion-resistant composite steel plate provided by the embodiment of the invention, the wear-resistant and corrosion-resistant composite steel plate comprises the base layer and the composite layer compounded on the surface of the base layer, and the composite steel plate with excellent corrosion resistance and wear resistance can be finally obtained by carrying out component design on the composite layer and combining an optimized manufacturing process and a manufacturing process of a vacuum hot rolling method and an on-line quenching treatment on the basis of the chemical element composition of the embodiment of the invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention more clear, the technical solutions of the present invention will be clearly and completely described below in connection with the embodiments of the present invention. It will be apparent that the described embodiments are some, but not all, embodiments of the invention. All other embodiments, which are obtained by a person skilled in the art based on the described embodiments of the invention, fall within the scope of protection of the invention.
Unless defined otherwise, technical or scientific terms used herein should be given the ordinary meaning as understood by one of ordinary skill in the art to which this invention belongs. The terms "first," "second," and the like, as used herein, do not denote any order, quantity, or importance, but rather are used to distinguish one element from another. Likewise, the terms "a" or "an" and the like do not denote a limitation of quantity, but rather denote the presence of at least one. The terms "connected" or "connected," and the like, are not limited to physical or mechanical connections, but may include electrical connections, whether direct or indirect. "upper", "lower", "left", "right", etc. are used merely to indicate a relative positional relationship, which changes accordingly when the absolute position of the object to be described changes.
The abrasion-resistant and corrosion-resistant clad steel plate (hereinafter simply referred to as clad steel plate) of the embodiment of the present invention will be described in detail first.
According to the composite steel plate provided by the embodiment of the invention, the composite steel plate comprises a base layer and a composite layer composited on the surface of the base layer; the composite layer comprises Fe base and chemical elements with the following mass percentages dispersed in the Fe base: c:0.33% -0.45%, si:0.2 to 0.8 percent, mn:0.4 to 1 percent, P is less than or equal to 0.030 percent, S is less than or equal to 0.010 percent, cr:11% -15%, nb:0.005% -0.05%, al:0.01 to 0.07 percent, cu is less than or equal to 0.3 percent, and Ni is less than or equal to 0.2 percent. That is, by the composition design of the chemical elements, a composite layer with microstructure of martensite, retained austenite, dispersed precipitated phase and Rockwell hardness of more than 50HRC can be formed, and the wear resistance and corrosion resistance of the composite steel plate are improved by adjusting the mass percentages of Cr, cu, mn, nb, ni and other beneficial elements in the composite layer.
Further, the base layer comprises a Fe base and the following chemical elements in percentage by mass dispersed in the Fe base: c:0.2 to 0.35 percent, si:0.1 to 0.6 percent, mn:0.6 to 1.6 percent, P is less than or equal to 0.03 percent, S is less than or equal to 0.01 percent, cr:0.1% -1%, nb:0.005% -0.05%, ti:0.005% -0.05%, al:0.01 to 0.06 percent, B:0.001% -0.005%, mo:0.01 to 0.50 percent of Ni:0.01 to 1 percent. That is, by designing the components of the chemical elements, a base layer with the Brinell hardness of 450HBW or more can be obtained on the premise of adding low carbon and low alloy elements, and the addition amount of noble metals in the base layer of the composite steel plate is small, so that the cost can be saved.
Further, the composite steel plate comprises a base layer and a composite layer composited on the surface of the base layer; the composite layer comprises the following components in percentage by mass: c:0.33% -0.45%, si:0.2 to 0.8 percent, mn:0.4 to 1 percent, P is less than or equal to 0.030 percent, S is less than or equal to 0.010 percent, cr:11% -15%, nb:0.005% -0.05%, al:0.01 to 0.07 percent, less than or equal to 0.3 percent of Cu, less than or equal to 0.2 percent of Ni, and the balance of Fe and unavoidable impurities. That is, the composite layer uses Fe as a main constituent element, and the wear resistance and corrosion resistance of the composite steel plate are improved by adjusting the mass percentage of beneficial elements and controlling the content of unavoidable impurities.
Further, the base layer comprises the following components in percentage by mass: c:0.2 to 0.35 percent, si:0.1 to 0.6 percent, mn:0.6 to 1.6 percent, P is less than or equal to 0.03 percent, S is less than or equal to 0.01 percent, cr:0.1% -1%, nb:0.005% -0.05%, ti:0.005% -0.05%, al:0.01 to 0.06 percent, B:0.001% -0.005%, mo:0.01 to 0.50 percent of Ni:0.01% -1%, and the balance of Fe and unavoidable impurities. That is, the base layer uses Fe as a main constituent element, and the addition amount of alloy elements is reduced and the cost is reduced by adjusting the mass percentage of beneficial elements and controlling the content of unavoidable impurities on the basis of ensuring the comprehensive mechanical properties of the base layer.
Specifically, in the invention, the design principle of each chemical element in the base layer and the composite layer is as follows:
c: c is the most basic and important element in the wear-resistant steel, and C can promote the steel to obtain a martensitic structure through solid solution strengthening and precipitation strengthening, so that the strength and the hardness of the steel are improved. If the content of C in the steel is too low, the martensitic structure, the required mechanical property and wear resistance of the steel cannot be ensured, and meanwhile, the plasticity and toughness of the steel are enhanced; if the content of C in the steel is too high, the segregation tendency of the steel in the continuous casting or die casting process is increased, the steel plate segregation is serious, the toughness of the steel plate is reduced, and the mechanical property index is unqualified.
Therefore, in the present invention, the mass percentage of C in the composite layer is controlled to be 0.33 to 0.45% for the composite layer having a microstructure of martensite, retained austenite, and dispersed precipitated phase and a rockwell hardness of 50HRC or more; for the base layer with Brinell hardness of 450HBW or more, the mass percentage of C of the base layer is controlled to be 0.2% -0.35%.
Si: proper Si is a beneficial deoxidizer in steel, can form calcium aluminum silicate inclusions which are easy to float up together with Ca and Al in the steel, improves the purity of the steel, and can improve the hardness and strength through the solid solution strengthening effect of Si in ferrite and austenite, but the toughness of the steel is drastically reduced due to the excessively high content of Si.
Therefore, in the present invention, the mass percentage of Si in the composite layer is controlled to be 0.2 to 0.8% for the composite layer having a microstructure of martensite, retained austenite, and dispersed precipitated phase and a rockwell hardness of 50HRC or more; for the base layer having a Brinell hardness of 450HBW or more, the mass percentage of Si of the base layer is controlled to be 0.1 to 0.6%.
Mn: mn can increase the hardenability of steel, reduce the transformation temperature of steel and the critical cooling rate of steel. However, when the Mn content is high, the crystal grains tend to coarsen, the tempering embrittlement sensitivity of the steel increases, segregation and cracks are likely to occur in the cast slab, and the performance of the steel sheet is lowered.
Therefore, in the present invention, the mass percentage of Mn in the composite layer is controlled to be 0.4% to 1% for the composite layer having a microstructure of martensite, retained austenite, and dispersed precipitated phase and a rockwell hardness of 50HRC or more; for the base layer having a Brinell hardness of 450HBW or more, the mass percentage of Mn of the base layer is controlled to be 0.6% to 1.6%.
Cr: cr can improve the hardenability of steel and the strength and hardness of steel, and can prevent or slow down the precipitation and aggregation of carbide during tempering, improve the tempering stability of steel and remarkably improve the corrosion resistance. However, an excessively high Cr content deteriorates the low temperature toughness, impact load fracture characteristics, bending cold workability of the steel sheet, and particularly, the weldability of the steel sheet.
Therefore, in the present invention, the mass percentage of Cr in the composite layer is controlled to 11% to 15% for the composite layer having a microstructure of martensite, retained austenite, and dispersed precipitated phase and a rockwell hardness of 50HRC or more; for the base layer with Brinell hardness of 450HBW or more, the mass percentage of Cr of the base layer is controlled to be 0.1% -1%.
Ti: ti is one of the strong carbide-forming elements and forms fine TiC particles with C. TiC particles are fine and distributed in grain boundaries, so that the effect of grain refinement is achieved, and the harder TiC particles improve the wear resistance of the steel.
Therefore, in the present invention, the mass percentage of Ti of the base layer is controlled to be 0.005% to 0.05% for the base layer having a Brinell hardness of 450HBW or more.
Al: al can form tiny indissolvable AlN particles with N in steel, and fine grains of the steel are formed. Al can refine the grains of the steel, fix N and O in the steel, lighten the sensitivity of the steel to gaps, reduce or eliminate the aging phenomenon of the steel and improve the toughness of the steel.
Therefore, in the present invention, the mass percentage of Al in the composite layer is controlled to be 0.01 to 0.07% for the composite layer having a microstructure of martensite, retained austenite, and dispersed precipitated phase and a rockwell hardness of 50HRC or more; for the base layer with Brinell hardness of 450HBW or more, the mass percentage of Al of the base layer is controlled to be 0.01% -0.06%.
P and S: p is an impurity brought into the steel by pig iron, and can be completely dissolved in ferrite, so that the plasticity and toughness of the steel are reduced; s is an impurity carried into the steel by pig iron and fuel, and sulfides formed in the steel during production reduce the mechanical properties of the steel and form hot-worked fibrous structures during rolling. Therefore, in the wear-resistant steel, P and S are harmful elements, and the content of P and S needs to be strictly controlled.
Therefore, in the invention, the mass percent of P of the base layer and the composite layer is controlled to be less than or equal to 0.030 percent, and the mass percent of S is controlled to be less than or equal to 0.010 percent.
Mo: mo can refine grains and improve strength and toughness. Mo is an element for reducing temper brittleness, and can improve temper stability.
Therefore, in the present invention, the mass percentage of Mo of the base layer is controlled to be 0.01% to 0.50% for the base layer having a brinell hardness of 450HBW or more.
Ni: ni has the effect of obviously reducing the cold-embrittlement transition temperature, but the excessive content is easy to cause that the oxide scale on the surface of the steel plate is difficult to fall off, and the cost is obviously increased.
Therefore, in the present invention, for a composite layer having a microstructure of martensite, retained austenite, and dispersed precipitated phase and a Rockwell hardness of 50HRC or more, ni in the composite layer is 0.2% by mass or less; for obtaining a base layer with Brinell hardness of 450HBW or more, the mass percentage of Ni of the base layer is controlled to be 0.01% -1%.
Nb: nb can improve the strength and toughness of steel by grain refinement.
Therefore, in the present invention, the mass percentage of Nb in the composite layer is controlled to be 0.005 to 0.05% for the composite layer having a microstructure of martensite, retained austenite, and dispersed precipitated phase and a rockwell hardness of 50HRC or more; for obtaining a base layer having a Brinell hardness of 450HBW or more, the mass percentage of Nb of the base layer is controlled to be 0.005 to 0.05%.
Cu: cu mainly exists in a solid solution state and a single phase precipitation state in steel, and the solid solution Cu plays a solid solution strengthening role; the solid solubility of Cu in ferrite is reduced rapidly along with the temperature reduction, so that the Cu in supersaturated solid solution is precipitated and separated out in a simple substance state at a lower temperature, thereby playing a role in precipitation strengthening. Meanwhile, cu is added into the steel, so that the atmospheric corrosion resistance of the steel can be obviously improved, and the effect is particularly obvious when the steel coexists with phosphorus.
Therefore, in the present invention, the mass percentage of Cu in the composite layer is 0.3% or less in order to obtain a composite layer having a microstructure of martensite, retained austenite, and dispersed precipitated phases and a rockwell hardness of 50HRC or more.
B: the main function of B is to improve the hardenability of the steel, so that the steel can have higher strength and hardness after quenching, thereby having good comprehensive performance after tempering, and the B content is too high to cause the hot embrittlement phenomenon, thereby influencing the welding performance and the hot processing performance of the steel.
Therefore, in the present invention, the mass percentage of B of the base layer is controlled to be 0.001% to 0.005% for the base layer having a Brinell hardness of 450HBW or more.
According to the composition design of the wear-resistant and corrosion-resistant composite steel plate, the mass percentages of chemical elements of the composite layer positioned on the surface of the base layer are reasonably designed, so that the composite layer with microstructure of martensite, retained austenite, dispersed precipitated phase and Rockwell hardness of more than 50HRC is obtained, and the wear resistance and corrosion resistance of the composite steel plate are improved; and the mass percent of each chemical element of the base layer is reasonably designed to obtain the base layer with the Brinell hardness of more than 450HBW, so that the addition amount of alloy elements of the composite steel plate is reduced, the production cost is reduced, and the wear resistance of the composite steel plate is ensured.
Further, the composite layer comprises a first composite layer positioned on one side surface of the base layer. That is, a first composite layer is formed on one of the surfaces of the base layer, and the first composite layer can be used for exposure to corrosion-prone working environments, and can improve the wear resistance and corrosion resistance of the overall composite steel sheet.
Further, the composite layer also comprises a second composite layer positioned on the other side surface of the base layer, wherein the components and/or the thicknesses of the first composite layer and the second composite layer are independent of each other. That is, the second composite layer is compounded on the other surface of the base layer, and the second composite layer can be used for being exposed in an operation environment which is easy to corrode, so that the wear resistance and corrosion resistance of the whole composite steel plate can be further improved, and the application range of the composite steel plate can be further improved.
The term "the composition and/or thickness of the first composite layer and the second composite layer are independent of each other" means that the composition of the first composite layer and the second composite layer may be the same or different, and similarly, the thickness may be the same or different.
Further, the first composite layer and the second composite layer are continuous casting blanks with the same chemical composition and the same thickness specification. That is, the chemical components and the thickness specifications of the first composite layer and the second composite layer are the same, so that the first composite layer and the second composite layer can be respectively compounded on the upper surface and the lower surface of the base layer by adopting the same manufacturing method and technological parameters, and the method has the advantage of convenient processing and manufacturing.
The thickness of the composite layer is not particularly limited, and may be appropriately adjusted according to the use environment.
In addition, there is no particular limitation as to whether the clad layer is formed on one side surface or both side surfaces (i.e., the first clad layer and the second clad layer), and the clad layer may be designed accordingly according to the environment in which it is used, for example, in the case of preparing a gas/liquid for transporting a corrosive high-speed flow using the clad steel sheet, the clad layer may be formed on one side, and when the clad steel sheet is used for a part of a processing machine having a corrosive atmosphere, the clad layer may be formed on both side surfaces.
The invention also provides a manufacturing method of the wear-resistant and corrosion-resistant composite steel plate, which comprises the following steps: s1, respectively proportioning the components of a base layer and a composite layer in a composite steel plate, smelting and casting to obtain a base layer steel billet and a composite layer steel billet; s2, sequentially assembling and rolling the base layer steel billet and the composite layer steel billet in the step S1 to obtain a prefabricated steel plate, wherein the rolling reduction is more than or equal to 50%; and S3, carrying out on-line quenching treatment on the prefabricated steel plate in the step S2 to obtain the composite steel plate. That is, on the basis of component design of the composite layer and the base layer of the composite steel plate, on the premise of low carbon and low alloy content, the effects of refining and strengthening the structure can be further improved by controlling the rolling reduction rate in the rolling process.
Further, in step S2, before the assembly, the rust layer and the oxide layer of each surface to be contacted are removed separately by machining to a depth of 5mm to 10mm. That is, before the assembly, the rust layer and the oxide layer on the surface thereof are removed by mechanical processing to avoid the contamination of impurities into the composite blank, affecting the performance of the composite steel sheet.
Further, step S2 includes: s21, forming a plurality of grooves on four sides of each surface to be contacted of the base layer steel billet and the composite layer steel billet respectively through machining, and forming a plurality of right angle holes at each groove respectively through machining, wherein the right angle holes are communicated to form a vacuum channel; s22, aligning the surface to be contacted of the base layer billet in the step S21 with the surface to be relieved of the composite layer billet, and forming the composite billet through sealing and welding treatment; s23, vacuumizing the composite blank in the step S22; s24, plugging a vacuum channel on the composite blank in the step S23; s25, placing the composite blank in the step S24 into a heating furnace, heating to 1000-1250 ℃, and preserving heat for 1-3 hours; s26, carrying out vacuum hot rolling on the composite blank in the step S25, wherein in the vacuum hot rolling step, the initial rolling temperature is 1000-1250 ℃, and the final rolling temperature is 850-950 ℃.
That is, firstly, the composite blank is rolled by adopting a vacuum hot rolling method, the vacuum hot rolling method is favorable for completely metallurgically bonding the base layer steel blank and the composite layer steel blank, the bonding force is strong, the comprehensive mechanical property is good, and the comprehensive mechanical property of the composite steel plate is further improved by controlling the technological parameters of the vacuum hot rolling. Specifically, the heating temperature is controlled between 1000 ℃ and 1250 ℃, so that carbon and alloy elements can be fully diffused at a composite interface, metallurgical bonding is realized, and homogenization of the carbon and the alloy elements is facilitated; the rolling method with the initial rolling temperature of 1000-1250 ℃ and the final rolling temperature of 850-950 ℃ is controlled in stages, so that the recrystallization and non-recrystallization effects can be fully exerted, the grain refinement is realized, and the toughness of the steel is improved; the rolling control effect can be further exerted by adopting large-reduction rolling with the reduction rate more than or equal to 50%, and the refinement and reinforcement effects are realized.
Further, in step S3, the prefabricated steel plate obtained by rolling in step S2 is quenched to 100-300 ℃ and then tempered, the tempering temperature is 150-350 ℃, the heat preservation time t minutes of the tempering temperature is used, the thickness of the composite steel plate is d mm, and the heat preservation time and the thickness of the composite steel plate satisfy the following relation: t=nd, where n is 2 to 4. That is, the heat treatment is carried out on the composite steel plate after vacuum hot rolling by adopting an on-line quenching mode, and on the premise of low carbon and low alloy content, the structure refinement and strengthening effect can be further improved by optimizing the water quenching midpoint temperature in the on-line quenching treatment, so that the composite steel plate with excellent comprehensive mechanical properties is obtained.
In order to make the objects, technical solutions and advantages of the present invention more apparent, embodiments of the present invention will be described in further detail with reference to examples.
Examples 1 to 5 and comparative example 1
The clad steel plates of examples 1 to 5 of the present invention were produced by the following steps:
(1) Calculating the allowance of the composite layer blank according to the components and the component contents of the composite layer shown in table 1, calculating the allowance of the base layer blank according to the components and the component contents of the base layer shown in table 2, considering the content of unavoidable impurities in the blank during calculation, and smelting and casting to obtain a base layer blank and a composite layer blank respectively;
(2) Removing rust layers and oxide layers on surfaces to be contacted of the base layer steel billet and the composite layer steel billet respectively through machining, wherein the machining depth is 8mm;
attaching the surface to be contacted of the composite layer steel billet to the surface to be contacted of the base layer steel billet, and forming a composite blank through sealing and welding treatment;
vacuum hot rolling the composite blank according to the parameters shown in Table 3 to obtain a prefabricated steel plate;
(3) The rolled clad steel plate was subjected to an on-line quenching treatment according to the parameters shown in table 3.
The steel sheet of comparative example 1 was manufactured by the manufacturing method of table 3 in accordance with the components and the component contents shown in table 1, except that comparative example 1 was a single-layered steel slab.
Table 1 shows the composition of the clad layer in the clad steel sheets of examples 1 to 5 and the steel sheet of comparative example 1.
Table 1 composition (wt.%) of the clad layer in the clad steel sheets of examples 1 to 5 and the steel sheet of comparative example 1
Table 2 shows the compositions of the base layers in the clad steel plates of examples 1 to 5.
Table 2 composition (wt.%) of the base layer in the clad steel plates of examples 1 to 5
Table 3 lists main process parameters of hot rolling and in-line quenching treatments for clad steel plates of examples 1 to 5 and main process parameters of the manufacturing method of comparative example 1.
TABLE 3 Main Process parameters of hot Rolling and in-line quenching treatment for clad steel sheets of examples 1-3 and Main Process parameters of manufacturing method of comparative example 1
The composite steel sheets of examples 1 to 5 and the steel sheet of comparative example 1 were sampled, respectively, and then the hardness test was performed on the surfaces of the base layer and the composite layer of the composite steel sheets of examples 1 to 5 and the steel sheet of comparative example 1, respectively.
The test results of the experiments corresponding to examples 1 to 5 and comparative example 1 are shown in Table 3.
Table 4 shows the base and composite layers of the clad steel plates of examples 1 to 5 and the hardness test results of comparative example 1.
TABLE 4 hardness test results of the base and composite layers of the clad steel sheets of examples 1 to 5 and comparative example 1
As can be seen from Table 4, the Rockwell hardness of the composite layer of examples 1-5 on the surface of the base layer is 50HRC or more, and the composite steel plate with good comprehensive mechanical properties, good wear resistance and corrosion resistance can be obtained by the composition design and the optimized manufacturing process.
In comparison, as shown in tables 1 to 4, although the mass percentages of the chemical elements of comparative example 1 are within the range defined by the chemical element composition of the clad layer of the clad steel sheet of the present invention, the reduction rate of the vacuum hot rolling and the cold stop temperature, tempering temperature of the manufacturing method thereof were not performed according to the manufacturing method provided by the present invention, which is disadvantageous in further refining and strengthening the structure through the manufacturing process, resulting in lower overall mechanical properties of comparative example 1 than examples 1 to 5.
According to the composite steel plate, the base layer is provided with excellent comprehensive mechanical properties on the premise of adding low carbon and low alloy elements by carrying out component design and optimized manufacturing process on the base layer, so that the wear resistance of the composite steel plate is improved; and the corrosion resistance of the composite steel plate is improved by carrying out component design and optimizing manufacturing process on the composite layer and adding beneficial alloy elements such as Cr, cu and the like.
While the foregoing is directed to the preferred embodiments of the present invention, it will be appreciated by those skilled in the art that various modifications and adaptations can be made without departing from the principles of the present invention, and such modifications and adaptations are intended to be comprehended within the scope of the present invention.

Claims (12)

1. The wear-resistant and corrosion-resistant composite steel plate is characterized by comprising a base layer and a composite layer which is composited on the surface of the base layer;
the composite layer comprises Fe base and chemical elements with the following mass percentages dispersed in the Fe base: c:0.33% -0.45%, si:0.2 to 0.8 percent, mn:0.4 to 1 percent, P is less than or equal to 0.030 percent, S is less than or equal to 0.010 percent, cr:11% -15%, nb:0.005% -0.05%, al:0.01 to 0.07 percent, cu is less than or equal to 0.3 percent, and Ni is less than or equal to 0.2 percent.
2. The wear-resistant and corrosion-resistant clad steel plate according to claim 1, wherein the base layer comprises an Fe-based and the following chemical elements dispersed in the Fe-based in mass percent: c:0.2 to 0.35 percent, si:0.1 to 0.6 percent, mn:0.6 to 1.6 percent, P is less than or equal to 0.03 percent, S is less than or equal to 0.01 percent, cr:0.1% -1%, nb:0.005% -0.05%, ti:0.005% -0.05%, al:0.01 to 0.06 percent, B:0.001% -0.005%, mo:0.01 to 0.50 percent of Ni:0.01 to 1 percent.
3. The wear-resistant and corrosion-resistant composite steel plate is characterized by comprising a base layer and a composite layer which is composited on the surface of the base layer;
the composite layer comprises the following components in percentage by mass: c:0.33% -0.45%, si:0.2 to 0.8 percent, mn:0.4 to 1 percent, P is less than or equal to 0.030 percent, S is less than or equal to 0.010 percent, cr:11% -15%, nb:0.005% -0.05%, al:0.01 to 0.07 percent, less than or equal to 0.3 percent of Cu, less than or equal to 0.2 percent of Ni, and the balance of Fe and unavoidable impurities.
4. A wear-resistant and corrosion-resistant clad steel plate according to claim 3, wherein the base layer comprises the following components in mass percent: c:0.2 to 0.35 percent, si:0.1 to 0.6 percent, mn:0.6 to 1.6 percent, P is less than or equal to 0.03 percent, S is less than or equal to 0.01 percent, cr:0.1% -1%, nb:0.005% -0.05%, ti:0.005% -0.05%, al:0.01 to 0.06 percent, B:0.001% -0.005%, mo:0.01 to 0.50 percent of Ni:0.01% -1%, and the balance of Fe and unavoidable impurities.
5. A wear-resistant and corrosion-resistant clad steel plate according to claim 1 or 3, wherein said clad layer comprises a first clad layer on one side surface of said base layer.
6. The wear-resistant and corrosion-resistant clad steel plate according to claim 5, wherein the clad layer further comprises a second clad layer on the other side surface of the base layer, wherein the composition and/or thickness of the first clad layer and the second clad layer are independent of each other.
7. The wear-resistant and corrosion-resistant clad steel plate according to claim 6, wherein the first clad layer and the second clad layer are continuous casting billets of the same chemical composition and the same thickness gauge.
8. A wear-resistant and corrosion-resistant clad steel plate according to claim 1 or 3, wherein the brinell hardness of the base layer is 450HBW or more and the rockwell hardness of the clad layer is 50HRC or more.
9. The method of manufacturing a wear-resistant and corrosion-resistant clad steel plate according to any one of claims 1 to 8, comprising the steps of:
s1, respectively proportioning the components of the base layer and the composite layer in the composite steel plate, smelting and casting to obtain a base layer steel billet and a composite layer steel billet;
s2, sequentially assembling and rolling the base layer steel billet and the composite layer steel billet in the step S1 to obtain a prefabricated steel plate, wherein the rolling reduction is more than or equal to 50%;
and S3, carrying out on-line quenching treatment on the prefabricated steel plate in the step S2 to obtain the composite steel plate.
10. The method according to claim 9, wherein in the step S2, before the assembling, the rust layer and the oxide layer of each surface to be contacted are removed separately by machining to a depth of 5mm to 10mm.
11. The method according to claim 9, wherein the step S2 comprises:
s21, forming a plurality of grooves on four sides of the surfaces to be contacted of the base layer steel billet and the composite layer steel billet respectively through machining, forming a plurality of right angle holes at the grooves respectively through machining, and communicating the right angle holes to form a vacuum channel;
s22, aligning the surface to be contacted of the base layer billet in the step S21 with the surface to be relieved of the composite layer billet, and forming a composite billet through seal welding treatment;
s23, vacuumizing the composite blank in the step S22;
s24, plugging a vacuum channel on the composite blank in the step S23;
s25, placing the composite blank in the step S24 into a heating furnace, heating to 1000-1250 ℃, and preserving heat for 1-3 hours;
s26, carrying out vacuum hot rolling on the composite blank in the step S25, wherein in the vacuum hot rolling step, the initial rolling temperature is 1000-1250 ℃, and the final rolling temperature is 850-950 ℃.
12. The method according to claim 11, wherein in the step S3, the prefabricated steel sheet obtained by rolling in the step S2 is quenched to 100-300 ℃ and then tempered, the tempering temperature is 150-350 ℃, and the thickness of the composite steel sheet is d mm at the tempering temperature holding time t minutes, so that the holding time and the thickness of the composite steel sheet satisfy the following relation:
t=nd, where n is 2 to 4.
CN202210758732.1A 2022-06-30 2022-06-30 Wear-resistant corrosion-resistant composite steel plate and manufacturing method thereof Pending CN117363995A (en)

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