Multiscale TiC particle reinforced thick-wear-resistant steel material and preparation method thereof

Abstract

The application relates to the technical field of metallurgical materials, in particular to a multi-scale TiC particle reinforced large-thickness erosion-resistant steel material and a preparation method thereof. The TiC particle diameter of the steel material is D, wherein the weight percentage of TiC particles with 30nm<=D<100nm is 40-55%, the weight percentage of TiC particles with 100nm<=D<500nm is 25-35%, and the weight percentage of TiC particles with 500nm<=D<=2mu m is 15-25%. The steel material has excellent strength, toughness, wear resistance and corrosion resistance.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of metallurgical materials, in particular to a multi-scale TiC particle reinforced large-thickness wear-resistant steel material and a preparation method thereof. BACKGROUND

[0002] Wear-resistant steel is a functional steel widely used in harsh working conditions such as mining machinery, ocean equipment, and conveying equipment. Its main performance requirements are high strength, high hardness, and good wear resistance. However, in many practical application scenarios such as ocean platforms, mortar pipelines, and ore dressing equipment, the material not only bears mechanical wear but also is exposed to corrosive media (such as salt mist, slurry, and chloride solution), forming a "corrosion-wear" combined effect, which makes traditional wear-resistant steel face serious problems such as short service life and severe surface damage.

[0003] Traditional C-Si-Mn martensitic wear-resistant steel exhibits good wear resistance in dry wear environments, but in order to obtain high hardness, it usually adopts a high carbon content, which leads to the problem of accelerated electrochemical corrosion in corrosive environments containing salt and weak acid, especially the formation of corrosion pits, which accelerates the wear process. In addition, this type of steel generally has weak work hardening capacity, poor toughness, and insufficient crack resistance, which cannot meet the increasingly complex industrial application requirements.

[0004] In recent years, researchers have attempted to introduce micro-alloying elements (such as Ti, Nb, and V) and corrosion-resistant elements (such as Sn, Cu, and Ni) into steel to improve the microstructure and service performance. Among them, Ti element can react with C in situ to form high-hardness TiC particles in steel, significantly improving the wear resistance of the material. However, the size control and distribution uniformity of TiC particles in the existing technology during heat treatment still have deficiencies, and the problem of oversize or aggregation is easy to occur, which limits the further play of its strengthening effect.

[0005] On the other hand, Sn element as a typical corrosion-resistant alloying element has good electrochemical stability, and its micro-alloying can to some extent inhibit the chloride-induced local corrosion and pitting behavior, but the existing applications are mostly concentrated in the field of low-strength steel or stainless steel, and its synergistic effect with the strengthening mechanism in multi-phase microstructure high-strength wear-resistant steel has not been fully played.

[0006] Therefore, it is urgent to provide a steel material with excellent strength, toughness, wear resistance, and corrosion resistance and a preparation method thereof. SUMMARY

[0007] The present application aims to solve the technical problem of providing a steel material with excellent strength, toughness, wear resistance, and corrosion resistance and a preparation method thereof.

[0008] To achieve the above object, the present application provides a multi-scale TiC particle reinforced large-thickness erosion-resistant steel material in the first aspect, wherein,

[0009] The TiC particle size in the steel material is D, wherein,

[0010] The weight percentage of TiC particles with 30nm≤D<100nm is 40-55%,

[0011] The weight percentage of TiC particles with 100nm≤D<500nm is 25-35%,

[0012] The weight percentage of TiC particles with 500nm≤D≤2μm is 15-25%.

[0013] The present application provides a preparation method of the above multi-scale TiC particle reinforced large-thickness erosion-resistant steel material in the second aspect, wherein the method comprises:

[0014] melting and casting, homogenization treatment, rolling, and heat treatment;

[0015] The homogenization treatment conditions include 1150-1250°C × 2.5-3.5h;

[0016] The final rolling temperature is 900-920°C, and the temperature is cooled to 20-30°C at a speed of 0.1-0.3°C / s after rolling.

[0017] The present application has the following beneficial effects:

[0018] (1) The nano-, sub-nano-, and micron-level three-peak distributed TiC particles are introduced into the wear-resistant steel to realize multi-scale dispersion strengthening on the martensite-ferrite matrix, significantly improving the hardness and erosion resistance.

[0019] (2) By reasonably adjusting the synergistic content of Cr and Mo, the PSI index is >1.3, which ensures that the central region obtains the same strengthening structure as the surface layer, effectively solving the problem of uneven organization of thick plates.

[0020] (3) By adjusting the electrochemical stability through Sn micro-alloying, the pitting corrosion propagation is significantly inhibited, the corrosion resistance is improved, and the CDWI≤1.4 is controlled, showing excellent combined service ability.

[0021] (4) The present application adopts conventional continuous casting, controlled rolling, and heat treatment process, which has low equipment investment cost, wide composition and organization control window, is suitable for batch industrial production, can be used in marine engineering, mining transportation, coastal equipment, and salt slurry erosion scenes, and has significant engineering popularization value and industrialization prospect. BRIEF DESCRIPTION OF DRAWINGS

[0022] Figure 1SEM image of the steel material obtained in Example 1 of the present application;

[0023] Figure 2 TEM image of the steel material obtained in Example 1 of the present application;

[0024] Figure 3 SEM image of the steel material obtained in Comparative Example 5 of the present application. DETAILED DESCRIPTION

[0025] The endpoints of the ranges and any values claimed herein are not to be understood as limited to the exact values recited as implicitly split by the language of the specification. Any numeric range recited herein is intended to include all values and sub-ranges of the values within that ranges. For values which are less than one, one unit is considered to be 0.0001, 0.001, 0.01 or 0.1 as appropriate. For values which are greater than one, one unit is considered to be 1, 10, 100, 1,000 or 10,000 as appropriate. These are only examples of what is specifically intended and all possible combinations of numerical values between the lowest value and the highest value enumerated, are to be considered to be expressly stated in this application.

[0026] In the prior art, it is difficult to prepare a steel material with excellent strength, toughness, wear resistance and corrosion resistance by using existing alloy compositions and preparation processes, so that the steel material is difficult to be applied to marine engineering, mine machinery, mortar conveying and other high corrosion and wear working conditions.

[0027] In the present application, the inventors found that it is still difficult to have excellent strength, toughness, wear resistance and corrosion resistance by only introducing micro-alloying elements (such as Ti, Nb, V) and corrosion-resistant elements (such as Sn, Cu, Ni) into the steel to improve the microstructure and service performance.

[0028] To achieve this goal, the inventors optimized the component composition of the wear-resistant steel, and found that the synergistic mechanism of optimizing the chemical composition design, heat treatment process and microstructure regulation can significantly improve the wear resistance, corrosion resistance and comprehensive mechanical properties of the steel material.

[0029] The present application provides a multi-scale TiC particle reinforced large-thickness wear-resistant and corrosion-resistant steel material, wherein,

[0030] The particle size of the TiC particles in the steel material is D, wherein,

[0031] The weight percentage of the TiC particles with 30nm≤D<100nm is 40-55%,

[0032] The weight percentage of the TiC particles with 100nm≤D<500nm is 25-35%,

[0033] The weight percentage of the TiC particles with 500nm≤D≤2μm is 15-25%.

[0034] In the application, the TiC particles are formed with a multi-peak particle size distribution by controlling the solidification cooling rate, finish rolling temperature, cooling rate and heat treatment holding system, and are uniformly distributed in the grain and the grain boundary area to realize multi-scale dispersion strengthening.

[0035] In the application, the nano-, sub-nano- and micro-sized TiC particles with specific size and content are respectively distributed in the grain and the grain boundary area to realize multi-scale dispersion strengthening structure.

[0036] According to the application, the pearlite suppression index PSI of a 2mm steel plate taken as the center of the steel material thickness direction is greater than 1.3, and the PSI is defined by the following formula: PSI=C+0.35Mn+0.8Cr+1.5Mo, wherein each element represents the content of the respective element, and the unit is weight percentage.

[0037] In the application, the center refers to the center of the steel material thickness direction at 1 / 2 in the thickness direction.

[0038] In the application, by reasonably adjusting the synergistic content of Cr and Mo, the PSI index is greater than 1.3, which ensures that the center area obtains the same strengthening structure as the surface layer, and effectively solves the problem of uneven structure of thick plates.

[0039] According to the application, the components and weight percentages in the steel material are as follows:

[0040] The content of C is 0.18-0.22%;

[0041] The content of Si is 0.8-1.2%;

[0042] The content of Mn is 1.6-2.0%;

[0043] The content of Cr is 0.3-0.6%;

[0044] The content of Mo is 0.1-0.3%;

[0045] The content of Ti is 0.25-0.35%;

[0046] The content of Sn is 0.05-0.1%;

[0047] The content of Al is 0.15-0.25%;

[0048] The content of B is 0.001-0.003%;

[0049] The content of S is ≤0.10%;

[0050] The content of P is ≤0.02%;

[0051] The content of other impurity elements is ≤0.03% individually;

[0052] The total content of other impurity elements is ≤0.1%.

[0053] The balance is Fe.

[0054] In the application, Cr and Mo are added to improve the hardenability and inhibit the pearlite structure in the center of the thick plate; Sn improves the electrode potential to improve the corrosion resistance, especially the inhibition of the expansion of pitting induced by chloride ions; B can significantly refine the grain and improve the toughness of the material; Al, as a strong deoxidizer, can also form AlN particles with the unavoidable N element in the steel, realizing grain refinement and dislocation pinning, which helps to improve the thickness direction impact toughness of the steel plate.

[0055] According to the application, the volume content of the martensite phase of the steel material is 75-85%, and the volume content of the ferrite phase is 15-25%.

[0056] According to the application, the thickness of the steel material is 60-120mm, the tensile strength at the 1 / 4 of the thickness direction of the steel material is 1200-1320MPa, the elongation after fracture is 16-18%, and the surface hardness is 400-440HV.

[0057] In the application, the 1 / 4 of the thickness direction of the steel material refers to the 1 / 4 and 3 / 4 of the same thickness direction as the center to take standard pieces for tensile strength test, which have excellent performance of tensile strength of 1200-1320MPa.

[0058] According to the application, in the combined environment of 3.5% NaCl solution and abrasive particle erosion, the corrosion and wear synergistic index CDWI of the steel material is ≤1.4.

[0059] In the application, the electrochemical stability is regulated by Sn micro-alloying to significantly inhibit the expansion of pitting and improve the corrosion resistance, while controlling CDWI ≤1.4, which shows excellent combined service capability.

[0060] The second aspect of the application provides a preparation method of the above-mentioned multi-scale TiC particle reinforced large-thickness wear-resistant steel material, wherein the method comprises:

[0061] melting and casting, homogenization treatment, rolling, and heat treatment;

[0062] The conditions of the homogenization treatment include: 1150-1250°C × 2.5-3.5h;

[0063] The final rolling temperature is 900-920℃, and the rolling is cooled to 20-30℃ at a speed of 0.1-0.3℃ / s.

[0064] In the application, the conditions of melting and casting can be according to the conventional melting and casting conditions in the field.

[0065] Specifically, the refining temperature is 1600-1650℃, the casting temperature is 1550-1600℃, and the casting speed is 0.8-1.2m / min.

[0066] According to the application, the conditions of the heat treatment include: heating the plate after rolling cooling to 840-880℃, the holding time T and the thickness L of the steel plate after rolling satisfy the relationship: T=3L, the unit of T is min, and the unit of L is mm, and then water cooling to 20-30℃ after holding.

[0067] Test method

[0068] Tensile test, according to standard GB / T 228.1-2020 "Metallic materials-Tensile test-Part 1: Method of test at room temperature", the tensile strength and elongation after fracture of the steel are tested, and the sample preparation and test conditions meet the requirements of the standard.

[0069] Surface Brinell hardness test, according to standard GB / T 231.1-2021 "Metallic materials-Brinell hardness test-Part 1: Test method", the Brinell hardness of the surface of the steel is measured.

[0070] Abrasion resistance, according to ASTM G65-16(2021) "Standard test method for measuring abrasion using the dry sand / rubber wheel apparatus" and T / CSCP 0035.8-2017 "Laboratory corrosion testing of low alloy structural steel-Part 8: Laboratory uniform corrosion immersion test method for low alloy structural steel", the abrasion resistance of the steel is comprehensively evaluated.

[0071] The technical solutions of the application will be further described in detail below in combination with the drawings and examples. Obviously, the examples described here are only part of the examples of the application and are not used to limit the application. Based on the examples in the application, all other examples implemented by those skilled in the art without creative improvement are within the protection scope of the application.

[0072] Example 1

[0073] The chemical composition of the steel material (in percentage by weight) is as follows: C: 0.22%, Si: 1.2%, Mn: 2.0%, Cr: 0.6%, Mo: 0.3%, Ti: 0.35%, Sn: 0.10%, Al: 0.20%, B: 0.003%, S≤0.005%, P≤0.003%, and the balance of Fe, and other impurity elements with a single content≤0.03% and a total content≤0.1%. The above chemical composition is proportioned and smelted in a converter, and then subjected to secondary refining and casting to form a continuous casting slab. The slab is heated to 1200°C for homogenization treatment, and then rolled into a 120mm-thick steel plate by using a controlled rolling process, with a finish rolling temperature controlled at 910°C. After rolling, the steel plate is cooled to room temperature at a cooling rate of 0.3°C / s, and then heated to 880°C in the furnace, and then water-cooled to room temperature after holding for 360 minutes. Finally, a dual-phase composite structure of martensite and ferrite is obtained.

[0074] The volume content of the martensite phase is 85%, and the volume content of the ferrite phase is 15%. During thermal deformation and controlled cooling, Ti and C react in situ to form multi-scale TiC particles, which have a three-peak distribution in particle size, with nanoscale (30-100nm) accounting for 55%, submicron (100-500nm) accounting for 25%, and micron (0.5-2μm) accounting for 20%. The particles are uniformly distributed in the grain and the grain boundary region, and form a multi-scale strengthening network. The PSI is 1.85, which effectively inhibits the transformation of the center pearlite.

[0075] The steel material A1 is prepared.

[0076] Through performance testing, the tensile strength of the 120mm-thick steel plate is 1263MPa, the elongation after fracture is 19.6%, and the surface hardness is 433HV. The comprehensive performance meets the use requirements of high-corrosion and wear conditions.

[0077] Example 2

[0078] The chemical composition of the steel material (in percentage by weight) is as follows: C: 0.20%, Si: 1.0%, Mn: 1.8%, Cr: 0.4%, Mo: 0.20%, Ti: 0.30%, Sn: 0.10%, Al: 0.20%, B: 0.003%, S≤0.005%, P≤0.003%, and the balance of Fe and unavoidable impurities. The above chemical composition is proportioned and smelted in a converter, and then subjected to secondary refining and casting to form a continuous casting slab. The slab is heated to 1200°C for homogenization treatment, and then rolled into a 80mm-thick steel plate by using a controlled rolling process, with a finish rolling temperature controlled at 910°C. After rolling, the steel plate is cooled to room temperature at a cooling rate of 0.2°C / s, and then heated to 860°C in the furnace, and then water-cooled to room temperature after holding for 240 minutes. Finally, a dual-phase composite structure of martensite and ferrite is obtained.

[0079] The volume content of the martensite phase is 80%, and the volume content of the ferrite phase is 20%; during the thermal deformation and controlled cooling process, Ti and C in-situ react to generate multi-scale TiC particles, the particle size presents a three-peak distribution, the nano-scale (30-100 nm) accounts for 50%, the sub-micron scale (100-500 nm) accounts for 30%, and the micron scale (0.5-2 μm) accounts for 20%, which are uniformly distributed in the grain and the grain boundary region to construct a multi-scale strengthening network; PSI=1.45, which effectively inhibits the transformation of the center pearlite.

[0080] The steel A2 is prepared.

[0081] Through performance testing, the tensile strength of the 80 mm thick steel plate is 1257 MPa, the elongation after fracture is 18.9%, and the surface hardness is 427 HV, and the comprehensive performance meets the use requirements of high corrosion and wear conditions.

[0082] Example 3

[0083] The chemical composition (by weight percentage) of the steel is as follows: C: 0.18%, Si: 0.8%, Mn: 1.6%, Cr: 0.4%, Mo: 0.20%, Ti: 0.30%, Sn: 0.10%, Al: 0.20%, B: 0.003%, S≤0.005%, P≤0.003%, and the rest is Fe and unavoidable impurities. The above chemical composition is proportioned, smelted in a converter, and then subjected to secondary refining to form a continuous casting slab. The slab is heated to 1200℃ for homogenization treatment, and then rolled into a 60 mm thick steel plate by using a controlled rolling process, with the finish rolling temperature controlled at 910℃. After rolling, it is cooled to room temperature at a cooling rate of 0.1℃ / s, and then heated to 840℃ in the furnace, and then water-cooled to room temperature after holding for 180 minutes. Finally, a martensite + ferrite dual-phase composite structure is obtained.

[0084] The volume content of the martensite phase is 75%, and the volume content of the ferrite phase is 25%; during the thermal deformation and controlled cooling process, Ti and C in-situ react to generate multi-scale TiC particles, the particle size presents a three-peak distribution, the nano-scale (30-100 nm) accounts for 40%, the sub-micron scale (100-500 nm) accounts for 35%, and the micron scale (0.5-2 μm) accounts for 25%, which are uniformly distributed in the grain and the grain boundary region to construct a multi-scale strengthening network; PSI=1.36, which effectively inhibits the transformation of the center pearlite.

[0085] The steel A3 is prepared.

[0086] Through performance testing, the tensile strength of the 60 mm thick steel plate is 1262 MPa, the elongation after fracture is 18.5%, and the surface hardness is 431 HV, and the comprehensive performance meets the use requirements of high corrosion and wear conditions.

[0087] Comparative Example 1

[0088] The steel material is prepared according to the method of Example 1, except that no Ti element is added, and no multi-scale TiC particles are generated to provide precipitation strengthening effect. Finally, a dual-phase structure of martensite and ferrite is obtained, wherein the volume content of the martensite phase is 70%, the volume content of the ferrite phase is 30%, and no nano-scale TiC particles are observed.

[0089] Due to the lack of TiC particle dispersion strengthening, the matrix strengthening effect is significantly reduced.

[0090] The steel material DA1 is prepared.

[0091] Through performance testing, the tensile strength of the 120mm thick steel plate is 1018MPa, the elongation after fracture is 15.3%, and the surface hardness is 368HV, which does not meet the comprehensive performance requirements of the present application.

[0092] Comparative Example 2

[0093] The steel material is prepared according to the method of Example 1, except that the Ti content is 0.1%, and no multi-scale TiC particles are generated to provide precipitation strengthening effect. Finally, a dual-phase structure of martensite and ferrite is obtained, wherein the volume content of the martensite phase is 75%, the volume content of the ferrite phase is 25%. The nano-scale (30-100nm) accounts for 15%, the sub-micron scale (100-500nm) accounts for 10%, the micron scale (0.5-2μm) particles account for 20%, and the particles with size greater than 2μm account for 55%. Since the Ti content is only 0.1%, it is impossible to form a multi-scale TiC three-peak particle distribution, resulting in insufficient precipitation strengthening effect.

[0094] The steel material DA2 is prepared.

[0095] Through performance testing, the tensile strength of the 120mm thick steel plate is 1098MPa, the elongation after fracture is 15.7%, and the surface hardness is 387HV, which does not meet the comprehensive performance requirements of the present application.

[0096] Comparative Example 3

[0097] The steel material is prepared according to the method of Example 1, except that no Sn element is added, and the volume content of the martensite phase is 80%, and the volume content of the ferrite phase is 20%. The nano-scale (30-100nm) accounts for 35%, the sub-micron scale (100-500nm) accounts for 35%, and the micron scale (0.5-2μm) particles account for 30%.

[0098] The steel material DA3 is prepared.

[0099] Since Sn is not introduced, the effect of Sn element on improving electrode potential is lacking, and the pitting sensitivity of the steel material in a corrosive environment is significantly increased, and the interface instability causes a significant decrease in plasticity.

[0100] The 120mm thick steel plate has a tensile strength of 1157MPa, an elongation of 12.4%, and a surface hardness of 398HV, which does not meet the comprehensive performance requirements of the present application.

[0101] Comparative Example 4

[0102] The steel material was prepared according to the method of Example 1, except that the Cr content was 0.2% and the Mo content was 0.1%. The PSI decreased to 1.05. The nano-scale (30-100nm) accounted for 30%, the sub-micron scale (100-500nm) accounted for 30%, and the micron-scale (0.5-2μm) particles accounted for 20%. The martensite phase volume content was 55%, the ferrite phase volume content was 20%, and the pearlite content was 25%.

[0103] The steel material DA4 was prepared.

[0104] The core produced pearlite, and the ductility, strength, and hardness decreased significantly.

[0105] The 120mm thick steel plate has a tensile strength of 944MPa, an elongation of 10.4%, and a surface hardness of 374HV, which does not meet the comprehensive performance requirements of the present application.

[0106] Comparative Example 5

[0107] The steel material was prepared according to the method of Example 1, except that the steel material after rolling was heated to 800℃.

[0108] The steel material DA5 was prepared.

[0109] Due to the decrease in quenching temperature, the ferrite structure increased and the proportion of martensite decreased. The martensite phase volume content was 60%, and the ferrite phase volume content was 40%. Due to the heating temperature being lower than the critical range of austenitization, the amount of austenite transformation was insufficient, resulting in a martensite phase proportion of only 60%, and the structure was soft, with decreased strength and hardness. The nano-scale (30-100nm) accounted for 20%, the sub-micron scale (100-500nm) accounted for 20%, the micron-scale (0.5-2μm) particles accounted for 25%, and the particles larger than 2μm accounted for 35%.

[0110] The 120mm thick steel plate has a tensile strength of 956MPa, an elongation of 18.4%, and a surface hardness of 364HV, which does not meet the comprehensive performance requirements of the present application.

[0111] Corrosion and wear experiments were conducted on A1-A3, DA1-DA5, and conventional C-Si-Mn steels, and the experimental results are shown in Table 1

[0112] Table 1

[0113]

[0114] By comparing the examples and comparative examples, it can be seen that the steel provided by the present invention has excellent strength, toughness, wear resistance and corrosion resistance.

[0115] Instruction manual attached Figure 1 The image shown is a SEM image of the steel obtained in Example 1 of this invention, indicating the distribution of TiC particles in the microstructure.

[0116] Instruction manual attached Figure 2 The image shown is a TEM image of the steel obtained in Example 1 of this invention, illustrating the interfacial bonding of the nano-TiC particles.

[0117] Instruction manual attached Figure 3 The SEM image of the steel obtained in Comparative Example 5 of this invention shows that the proportion of ferrite increases and the proportion of martensite decreases.

[0118] The above description is merely a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A multi-scale TiC particle reinforced thick-walled erosion resistant steel material, characterized by, The steel material comprises the following components and weight percentages: C content is 0.18-0.22%; Si content is 0.8-1.2%; Mn content is 1.6-2.0%; Cr content is 0.3-0.6%; Mo content is 0.1-0.3%; Ti content is 0.25-0.35%; Sn content is 0.05-0.1%; Al content is 0.15-0.25%; B content is 0.001-0.003%; S content is ≤0.10%; P content is ≤0.02%; Other impurity elements each have a content of ≤0.03%; Other impurity elements have a total content of ≤0.1%; The balance is Fe. The preparation method of the multi-scale TiC particle reinforced large-thickness abrasion-resistant steel material comprises: melting and casting, homogenization treatment, rolling, and heat treatment. The homogenization treatment conditions comprise: 1150-1250°C × 2.5-3.5h. The final rolling temperature is 900-920°C, and the steel material is cooled to 20-30°C at a speed of 0.1-0.3°C / s after rolling. The heat treatment conditions comprise: heating the steel material cooled after rolling to 840-880°C, and the relationship between the holding time T and the thickness L of the steel plate after rolling is T=3L, the unit of T is min, and the unit of L is mm, and the steel material is water-cooled to 20-30°C after holding.

2. The steel material according to claim 1, characterized by The TiC particle size in the steel material is D, wherein, the weight percentage of TiC particles with a particle size of 30nm≤D<100nm is 40-55%, the weight percentage of TiC particles with a particle size of 100nm≤D<500nm is 25-35%, the weight percentage of TiC particles with a particle size of 500nm≤D≤2μm is 15-25%.

3. The steel material according to claim 1, characterized by A 2mm-thick steel plate is taken as the center at 1 / 2 of the thickness direction of the steel material, the pearlite suppression index PSI of the steel plate is greater than 1.3, and the PSI is defined by the following formula: PSI=C+0.35Mn+0.8Cr+1.5Mo, wherein each element represents the content of the respective element, and the unit is weight percentage.

4. The steel material according to claim 1, characterized by The volume content of the martensite phase of the steel material is 75-85%, and the volume content of the ferrite phase is 15-25%.

5. The steel material according to claim 1, characterized by The thickness of the steel material is 60-120mm, the tensile strength at 1 / 4 of the thickness direction of the steel material is 1200-1320MPa, the elongation after fracture is 16-18%, and the surface hardness is 400-440HV.

6. The steel material according to claim 1, characterized by In a combined environment of 3.5% NaCl solution and abrasive particle erosion, the corrosion and wear synergistic index CDWI of the steel material is ≤1.

4.

7. A method of producing the multi-scale TiC particle reinforced thick abrasion-resistant steel material according to any one of claims 1 to 6, characterized by, The method comprises: melting and casting, homogenization treatment, rolling, and heat treatment. The homogenization treatment conditions comprise: 1150-1250°C × 2.5-3.5h. The final rolling temperature is 900-920°C, and the steel material is cooled to 20-30°C at a speed of 0.1-0.3°C / s after rolling.

8. The method of claim 7, wherein, The heat treatment conditions comprise: heating the steel material cooled after rolling to 840-880°C, and the relationship between the holding time T and the thickness L of the steel plate after rolling is T=3L, the unit of T is min, and the unit of L is mm, and the steel material is water-cooled to 20-30°C after holding.

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