CN111549277A - Atmospheric corrosion-resistant martensitic wear-resistant steel plate and manufacturing method thereof - Google Patents

Abstract

The application belongs to the technical field of iron and steel metallurgy, and in particular relates to a martensitic wear-resistant steel plate with resistance to atmospheric corrosion, which in mass percentage includes 0.14wt%≤C≤0.22wt%; 0.30wt%≤Si≤0.60wt%; 0.30wt% %≤Mn≤1.00wt%; 0.010wt%≤Ti≤0.020wt%; 0.02wt%≤Nb≤0.04wt%; 0.50wt%≤Ni≤1.0wt%; 0.20wt%≤Cu≤0.50wt%; 3.4wt% %≤Cr≤4.0wt%; 0.0010wt%≤B≤0.0020wt%; 0<S≤0.003wt%;0<P≤0.012wt%; the rest are iron and other inevitable impurities, wherein the atmospheric resistance The corroded martensitic wear-resistant steel plate can take into account the problems of steel plate hardness, plasticity, toughness, wear resistance and corrosion resistance.

Description

Atmospheric corrosion-resistant martensitic wear-resistant steel plate and manufacturing method thereof

technical field

The application belongs to the technical field of iron and steel smelting, and in particular relates to a martensitic wear-resistant steel plate resistant to atmospheric corrosion and a manufacturing method thereof.

Background technique

Wear-resistant steel plate, as a commonly used steel for construction machinery, is widely used in equipment such as mining, coal mine, metallurgy and other fields. Due to the harsh working environment in mining, coal mine, metallurgy and other fields, the corrosion resistance and corrosion resistance of wear-resistant steel plate are required. High wear resistance.

However, in order to increase the wear resistance of the steel plate, the traditional wear-resistant steel plate usually increases the carbon content or Ti content. Although the above method increases the wear resistance of the steel plate, it cannot guarantee the corrosion resistance of the steel plate, and the above method will reduce the corrosion resistance of the steel plate with the Hardness, plasticity or toughness are traded off to meet high wear resistance requirements.

Therefore, how to greatly improve the wear resistance and corrosion resistance of steel plates without affecting the hardness, plasticity and toughness of steel plates has become a key technical problem to be solved urgently in the current metallurgical and wear-resistant industries.

SUMMARY OF THE INVENTION

In view of this, the purpose of the present invention is to provide a kind of martensitic wear-resistant steel plate with atmospheric corrosion resistance and a manufacturing method thereof, so as to solve the problem that in the prior art, the hardness, plasticity, toughness, wear resistance and corrosion resistance of steel plates cannot be taken into account at the same time. The problem.

In order to achieve the above purpose of the invention, an embodiment of the present application provides, on the one hand, an atmospheric corrosion-resistant martensitic wear-resistant steel plate, and the atmospheric corrosion-resistant martensitic wear-resistant steel plate includes in mass percentage: 0.14wt%≤C ≤0.22wt%; 0.30wt%≤Si≤0.60wt%; 0.30wt%≤Mn≤1.00wt%; 0.010wt%≤Ti≤0.020wt%; 0.02wt%≤Nb≤0.04wt%; 0.50wt%≤Ni ≤1.0wt%; 0.20wt%≤Cu≤0.50wt%; 3.4wt%≤Cr≤4.0wt%; 0.0010wt%≤B≤0.0020wt%; 0<S≤0.003wt%; 0<P≤0.012wt% The rest are iron and other unavoidable impurities, and the atmospheric corrosion resistance index I of the atmospheric corrosion-resistant martensitic wear-resistant steel plate is 10 to 15; wherein the calculation formula of the atmospheric corrosion resistance index is:

I=26.01(%Cu)+3.88(%Ni)+1.20(%Cr)+1.49(%Si)+17.28(%P)-7.29(%Cu)(%Ni)-9.10(%Ni)(%P )-33.39(%Cu) ²

Wherein, the element symbol in parentheses is the mass percentage of the corresponding element, and the % element symbol represents the mass percentage of the corresponding element multiplied by 100.

Optionally, the atmospheric corrosion-resistant martensitic wear-resistant steel sheet includes, in mass percentage: 0.14wt%≤C≤0.18wt%; 0.30wt%≤Si≤0.50wt%; 0.30wt%≤Mn≤0.60wt% %; 0.012wt%≤Ti≤0.018wt%; 0.02wt%≤Nb≤0.03wt%; 0.50wt%≤Ni≤0.8wt%; 0.25wt%≤Cu≤0.45wt%; 3.5wt%≤Cr≤3.8wt% %; 0.0015wt%≤B≤0.0020wt%; 0<S≤0.003wt%; 0<P≤0.012wt%; the rest are iron and other inevitable impurities.

Optionally, the atmospheric corrosion-resistant martensitic wear-resistant steel sheet includes, by mass percentage, C: 0.15wt%; Si: 0.40wt%; Mn: 0.45wt%; Ti: 0.014wt%; Nb: 0.02wt% %; Ni: 0.65wt%; Cu: 0.38wt%; Cr: 3.5wt%; B: 0.0018wt%; S: 0.001wt%; P: 0.005wt%;

Optionally, the atmospheric corrosion resistance index I of the atmospheric corrosion-resistant martensitic wear-resistant steel sheet is 12-15.

Optionally, the structure of the atmospheric corrosion-resistant martensitic wear-resistant steel plate includes tempered martensite and carbide.

Optionally, the atmospheric corrosion-resistant martensitic wear-resistant steel plate has a yield strength of 1100 MPa to 1300 MPa, a tensile strength of 1300 MPa to 1500 MPa, a steel plate hardness of HBW 420 to 480, an elongation of 8% to 15%, and a temperature of -40°C. The impact energy is 27J～70J.

On the other hand, an embodiment of the present application provides a method for manufacturing a martensitic wear-resistant steel sheet that is resistant to atmospheric corrosion, which specifically includes the following steps: smelting molten steel into slabs, hot-rolling the slabs to form steel coils, and sequentially rolling the steel coils into slabs. After flattening, quenching and tempering treatment, a martensitic wear-resistant steel plate resistant to atmospheric corrosion is obtained.

Optionally, the smelting of molten steel into slabs includes: continuous casting of molten steel into slabs after successively undergoing KR method desulfurization, converter steelmaking, and RH method refining treatment, wherein the continuous casting step includes: It is 0.8～1.3m/min.

Optionally, forming the hot-rolled slab into a steel coil includes: after the slab is sequentially reheated, rough rolling, finishing rolling, and laminar cooling, coiling to form a steel coil, wherein the reheating step includes: reheating the slab, the heating temperature is 1200-1300°C, and the holding time is 20-30min; and/or

The step of rough rolling includes: the total reduction ratio of rough rolling is 75% to 85%, the single pass reduction ratio of rough rolling is 15% to 25%; the surface temperature of the slab after rough rolling is 1050 ℃～ 1100°C; and/or

The step of finishing rolling includes: the total reduction ratio of finishing rolling is 60%-80%, the single-pass reduction ratio of finishing rolling is 12%-20%; the finishing rolling temperature of finishing rolling is 840-890 DEG C ;and / or

The step of laminar cooling includes that the cooling rate of laminar cooling is 10°C/s˜25°C/s; and/or

The coiling step includes that the coiling temperature is 560-650°C.

Optionally, the step of quenching includes that the quenching heating temperature is 850° C.˜900° C., and the quenching and holding time is 20 min˜60 min.

Optionally, the step of tempering includes that the tempering temperature is 150°C to 200°C, and the tempering holding time is 30 to 60 minutes.

Compared with the prior art, the present application has the following beneficial effects:

The atmospheric corrosion-resistant martensitic wear-resistant steel plate described in this application includes relatively high corrosion-resistant elements Cr, Ni, and Cu, on the one hand, the corrosion resistance of the steel plate can be guaranteed, and its atmospheric corrosion resistance index I can reach more than 10; On the one hand, a higher Cr content can ensure higher hardness at a relatively low C content, and a higher Ni content can ensure that the steel plate has a relatively high strength and good low-temperature impact toughness. And the proper control of each chemical element, accurate composition ratio, simple steelmaking, rolling and cooling process can obtain better comprehensive properties of steel plate such as mechanics, welding, atmospheric corrosion resistance, etc.

The atmospheric corrosion-resistant martensitic wear-resistant steel plate described in this application has a yield strength of 1100 MPa to 1300 MPa, a tensile strength of 1300 MPa to 1500 MPa, a steel plate hardness of 420 to 480 HBW, an elongation of 8% to 15%, and impact energy at -40°C. It is 27J ~ 70J, and its service life under atmospheric corrosion conditions can reach more than 2 times that of Hardox450.

Description of drawings

In order to illustrate the technical solutions in the embodiments of the present application more clearly, the following briefly introduces the accompanying drawings that need to be used in the description of the embodiments or the prior art. Obviously, the drawings in the following description are only for the present application. In some embodiments, for those of ordinary skill in the art, other drawings can also be obtained according to these drawings without any creative effort.

FIG. 1 is a metallographic structure diagram of an atmospheric corrosion-resistant martensitic wear-resistant steel sheet provided by an embodiment of the application.

FIG. 2 is a metallographic structure diagram of the atmospheric corrosion-resistant martensitic wear-resistant steel sheet provided by another embodiment of the application.

Detailed ways

In order to make the technical problems, technical solutions and beneficial effects to be solved by the present invention clearer, the present invention will be further described in detail below with reference to the embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention, but not to limit the present invention.

On the one hand, an embodiment of the present application proposes a martensitic wear-resistant steel sheet that is resistant to atmospheric corrosion.

In the embodiments of the present application, the atmospheric corrosion-resistant martensitic wear-resistant steel sheet, in terms of mass percentage, includes: 0.14wt%≤C≤0.22wt%; 0.30wt%≤Si≤0.60wt%; 0.30wt%≤Mn≤ 1.00wt%; 0.010wt%≤Ti≤0.020wt%; 0.02wt%≤Nb≤0.04wt%; 0.50wt%≤Ni≤1.0wt%; 0.20wt%≤Cu≤0.50wt%; 3.4wt%≤Cr≤ 4.0wt%; 0.0010wt%≤B≤0.0020wt%; 0<S≤0.003wt%; 0<P≤0.012wt%; the rest are iron and other unavoidable impurities, the atmospheric corrosion-resistant martensite The atmospheric corrosion resistance index I of the ground steel sheet is 10-15.

In one embodiment, the atmospheric corrosion resistance index I of the atmospheric corrosion-resistant martensitic wear-resistant steel sheet is 10-12.

In one embodiment, the atmospheric corrosion resistance index I of the atmospheric corrosion-resistant martensitic wear-resistant steel sheet is 12-15.

The formula for calculating the atmospheric corrosion resistance index I is as follows:

I=26.01(%Cu)+3.88(%Ni)+1.20(%Cr)+1.49(%Si)+17.28(%P)-7.29(%Cu)(%Ni)-9.10(%Ni)(%P )-33.39(%Cu) ²

Wherein, the element symbol in parentheses is the mass percentage of the corresponding element, and the % element symbol represents the mass percentage of the corresponding element multiplied by 100.

The addition of relatively high corrosion-resistant elements Cr, Ni, and Cu in the examples of the present application can ensure the corrosion resistance of the steel plate, and its atmospheric corrosion resistance index I can reach more than 10; Relatively low C content has higher hardness, and higher Ni content can ensure that the steel plate has better low temperature impact toughness while having relatively high strength.

In one embodiment, the atmospheric corrosion-resistant martensitic wear-resistant steel sheet, in terms of mass percentage, includes: 0.14wt%≤C≤0.18wt%; 0.30wt%≤Si≤0.50wt%; 0.30wt%≤Mn≤0.60 wt%; 0.012wt%≤Ti≤0.018wt%; 0.02wt%≤Nb≤0.03wt%; 0.50wt%≤Ni≤0.8wt%; 0.25wt%≤Cu≤0.45wt%; 3.5wt%≤Cr≤3.8 wt%; 0.0015wt%≤B≤0.0020wt%; 0<S≤0.003wt%; 0<P≤0.012wt%; the rest are iron and other inevitable impurities.

In one embodiment, the atmospheric corrosion-resistant martensitic wear-resistant steel sheet, in terms of mass percentage, includes: 0.15wt%≤C≤0.16wt%; 0.35wt%≤Si≤0.45wt%; 0.40wt%≤Mn≤0.50 wt%; 0.013wt%≤Ti≤0.015wt%; 0.02wt%≤Nb≤0.25wt%; 0.6wt%≤Ni≤0.7wt%; 0.35wt%≤Cu≤0.40wt%; 3.5wt%≤Cr≤3.6 wt%; 0.0016wt%≤B≤0.0018wt%; 0<S≤0.002wt%; 0<P≤0.010wt%; the rest are iron and other inevitable impurities.

As a specific embodiment, the atmospheric corrosion-resistant martensitic wear-resistant steel sheet includes, in terms of mass percentage, C: 0.15wt%; Si: 0.40wt%; Mn: 0.45wt%; Ti: 0.014wt%; Nb: 0.02wt%; Ni: 0.65wt%; Cu: 0.38wt%; Cr: 3.5wt%; B: 0.0018wt%; S: 0.001wt%;

In the examples of this application, the principle of adding each chemical element is as follows:

Carbon C: Carbon can improve the hardenability of the steel plate, has a strong solid solution strengthening effect, and significantly improves the strength and hardness of the martensitic wear-resistant steel plate; but when the carbon content is too high, the elongation and impact energy of the wear-resistant steel plate The performance is reduced, and the welding performance is deteriorated; considering other mechanical properties and processing properties, the C content is controlled to be 0.14wt% to 0.22wt% in the examples of the present application.

Silicon Si: Si element is dissolved in the steel plate and has a certain solid solution strengthening effect, which can improve the strength of the steel plate. Too high Si content will inhibit the formation of cementite, while higher Si content will expand the formation of ferrite phase. Therefore, the Si content in the examples of the present application is controlled to be 0.30 wt % to 0.60 wt %.

Manganese Mn: Mn element is a weak carbide forming element, which is usually dissolved in the steel plate and has the effect of solid solution strengthening; if the Mn content is too high, the cracking tendency of the slab will increase, and it is easy to form longitudinal cracks during the production process of the slab. and other defects, while the lower Mn content contributes less to the strength, so it is necessary to add C element or other precious alloying elements such as Mo element to ensure the strength of the steel plate. However, adding C element will deteriorate the welding performance of the steel plate, and adding other precious elements will increase the cost of the steel plate. Therefore, in order to make the steel sheet have good strength and toughness, the content of Mn element in the examples of the present application is controlled to be 0.30wt% to 1.00wt%.

Titanium Ti: Ti element is mainly used to solidify N. Ti and N form TiN at high temperature. When the slab is heated for austenitization, TiN will inhibit the growth of austenite grains. During the hot rolling process, Ti and C are formed in a lower temperature range, TiC, and the fine TiC particles are beneficial to improve the low temperature impact performance of the steel plate. However, when the Ti content is too high, coarse square TiN will be formed, and the stress will be concentrated near the TiN particles when the steel plate is stressed, which will become the source of nucleation and growth of micro-cracks and reduce the fatigue performance of the steel plate. To sum up the above, the content of Ti element in the examples of the present application is controlled to be 0.010wt% to 0.020wt%.

Niobium Nb: Niobium is a strong carbon and nitrogen compound forming element, which has a very obvious effect on grain refinement. The recovery and recrystallization of deformed austenite is hindered by NbC strain-induced precipitation during hot rolling, and the deformed austenite in the non-recrystallized zone in the finishing rolling stage is transformed into finer ones during phase transformation through controlled rolling and controlled cooling. In order to make the steel have high strength and high toughness, the appropriate content can give full play to the role of controlled rolling. The higher Nb content will form coarse NbC precipitation during the tempering process, thereby reducing the low temperature impact energy of the steel plate. Therefore, in order to control the microstructure and mechanical properties of the steel sheet, the content of Nb element is controlled to be 0.020wt% to 0.040wt% in the examples of the present application.

Chromium Cr: Cr element and Fe element can form continuous solid solution and form various carbides with C element. Cr element can replace Fe element in _cementite to form _{M 3} C, and can form M ₇ C ₃ and _{M 23 C 6 .} Hardness and wear resistance, Cr element and Cr carbide dissolved in the steel will increase the strength of the steel plate. In addition, since Cr can significantly improve the corrosion resistance of steel plates, adding high content of Cr will significantly improve the atmospheric corrosion resistance of steel plates. However, a higher content of Cr will form coarser carbides, thereby deteriorating the impact properties of the steel sheet. Therefore, in order to ensure the corrosion resistance and strength of the steel sheet, the content of Cr element is controlled to be 3.4 wt % to 4.0 wt % in the examples of the present application.

Copper Cu: Cu is an essential element to improve the corrosion resistance of the steel plate. It forms a dense sulfide film on the surface of the steel plate, which can improve the uniform corrosion resistance and localized corrosion resistance of the steel plate. In order to achieve the effect of corrosion resistance protection, the Cu content should be above 0.2%. However, when the Cu content exceeds 0.5%, the hot workability and weldability of the steel will deteriorate. Therefore, in the embodiments of the present application, the content of Cu element is controlled to be 0.20wt% to 0.50wt%.

Nickel Ni: Ni is also an element that improves corrosion resistance, and is usually used in combination with Cu. In order to achieve the protective effect of corrosion resistance, the Ni content should be above 0.05%. However, when the Ni content exceeds 2.0%, the effect is saturated, which not only increases the cost, but also deteriorates the workability and weldability of the steel sheet. Ni can significantly improve the low-temperature toughness of steel, and has a favorable effect on impact toughness and ductile-brittle transition temperature, but considering the cost factor, the content of Ni element is controlled to be 0.50wt% to 1.0wt% in the examples of this application.

Boron B: The addition of B element to the steel will improve the hardenability of the steel sheet and form a bainite or martensite structure. When the B content is high, B atoms will be enriched at the grain boundary, reducing the binding energy of the grain boundary, so that intergranular dissociation fracture will occur when subjected to impact. Therefore, in the examples of the present application, the content of element B is controlled to be 0.0010wt% to 0.0020wt%.

P, S, O, N: Harmful impurity elements in steel will significantly reduce the plastic toughness and weldability of steel, so the content of the above impurity elements should be reduced as much as possible.

In the examples of the present application, proper control of the above-mentioned elements, accurate composition ratio, simple steelmaking, rolling and cooling processes can obtain better comprehensive properties of steel plates such as mechanics, welding, and atmospheric corrosion resistance.

The microstructure of the atmospheric corrosion-resistant martensitic wear-resistant steel plate described in the examples of the present application is tempered martensite with a small amount of carbides, wherein the carbides are mainly chromium carbides; the atmospheric corrosion-resistant martensitic wear-resistant steel plate has The yield strength is 1100MPa～1300MPa, the tensile strength is 1300MPa～1500MPa, the steel plate hardness is HBW420～480, the elongation is 8%～15%, the impact energy at -40℃ is 27J～70J, and its service life under atmospheric corrosion conditions can be Reach more than 2 times that of Hardox450.

On the other hand, an embodiment of the present application proposes a method for manufacturing a martensitic wear-resistant steel sheet that is resistant to atmospheric corrosion.

In the embodiment of the present application, the method for manufacturing the atmospheric corrosion-resistant martensitic wear-resistant steel plate includes the following steps:

S100, smelting molten steel into slabs;

The smelting of molten steel into slabs includes: after the molten steel is successively subjected to KR method desulfurization, converter steelmaking, and RH method refining treatment, continuous casting into slabs, wherein the continuous casting step includes: the continuous casting pulling speed is 0.8-1.3 m/min.

S200, hot rolled slab to form steel coil;

The hot-rolled slab to form a steel coil includes: after the slab is sequentially reheated, rough rolling, finishing rolling, and laminar cooling, coiling to form a steel coil,

The reheating step includes that the continuously cast steel billet can be sent to a soaking furnace or a heating furnace for heating, and when the steel billet is heated to 1200-1300° C., the holding time is 20-30 minutes. The heating temperature and holding time can make the austenite structure in the billet uniform, the carbides such as Nb and Ti in the billet can be fully dissolved, and TiN will also be partially dissolved to prevent the growth of the original austenite grains.

The rough rolling step includes: the heated billet is sent to the rough rolling unit for rough rolling, the rough rolling can be 5 passes or 7 passes, the single pass reduction ratio of the rough rolling mill is ≥15%, and the billet is in the rough rolling mill. The total reduction ratio of the upper part is 75% to 85%; the final rolling temperature of rough rolling is 1080 ° C; the steel billet becomes an intermediate billet after rough rolling. Preferably, the single-pass reduction ratio of the roughing mill is 15% to 25%.

The finishing rolling step includes: sending the intermediate billet into the finishing rolling unit for finishing rolling, the single pass reduction ratio of the finishing rolling mill is greater than or equal to 12%, and the total reduction ratio of the billet on the finishing rolling mill is greater than 60%; The rolling temperature is 840°C to 890°C; preferably, the single pass reduction ratio of the finishing mill is 12% to 20%, and the total reduction ratio of the billet on the finish mill is 60% to 80%.

The steps of laminar cooling and coiling include that the intermediate billet after finishing rolling can be cooled at a cooling rate of 10°C/S to 25°C/s, and the steel plate is cooled to 560 to 650°C; The lower coil is rolled into a steel coil.

S300, the steel coils are subjected to flattening, quenching, and tempering treatments in sequence to obtain a martensitic wear-resistant steel plate that is resistant to atmospheric corrosion.

The off-line steel coils are pile-cooled or slowly cooled to room temperature; then they are opened and flattened into steel plates under the condition of lower than 70 °C.

After opening and leveling, the steel plate is quenched. The quenching heating temperature is 850℃～900℃, and the quenching and holding time is 20min～60min; after quenching, the tempering treatment is carried out, and the tempering temperature is 150℃～200℃, and the tempering holding time is 30～60min. 60min.

Air-cooled after tempering.

The present invention is further explained below by specific embodiment:

The components of the atmospheric corrosion-resistant martensitic wear-resistant steel plates described in Examples 1-2 and the comparative example are shown in Table 1, the process parameters of controlled rolling and controlled cooling are shown in Table 2, the mechanical properties are shown in Table 3, and the results of the periodic infiltration test are shown in Table 4. The comparison steel used Hardox450.

Table 1

Composition (%) C Si Mn Ti Nb Ni Cu Cr B S P Example 1 0.16 0.40 0.45 0.014 0.02 0.65 0.38 3.5 0.0016 0.001 0.007 Example 2 0.16 0.50 0.50 0.018 0.03 0.70 0.45 3.5 0.0015 0.003 0.006 Comparative Example 1 0.18 0.49 1.20 0.004 0.016 0.08 0.01 0.62 0.0012 0.001 0.007

The preparation methods of the steel sheets described in Examples 1-2 and Comparative Examples include the following steps:

The molten steel is desulfurized by KR and then smelted in a 210-ton converter, desulfurized by KR method, smelted by converter, refined by RH method, and continuously cast into slabs. , the steel coils are sequentially flattened, quenched, and tempered into atmospheric corrosion-resistant martensitic wear-resistant steel plates, and the atmospheric corrosion-resistant martensitic wear-resistant steel plates can be spray-printed, packaged, and stored.

Table 2

The thickness of the atmospheric corrosion-resistant martensitic wear-resistant steel plate described in Example 1 is 8 mm, and its metallographic structure is shown in Figure 1. The metallographic structure of the steel plate in Figure 1 includes tempered martensitic structure plus a small amount of carbides , the steel plate has high wear resistance.

The thickness of the atmospheric corrosion-resistant martensitic wear-resistant steel plate described in Example 2 is 8 mm, and its metallographic structure is shown in Figure 2. The metallographic structure of the steel plate in Figure 2 includes a tempered martensitic structure and a small amount of carbides. , the steel plate has high wear resistance.

The specific mechanical properties of each embodiment and comparative example are shown in Table 3.

table 3

The yield strength of the atmospheric corrosion-resistant martensitic wear-resistant steel plates described in Examples 1-2 are all greater than 1100 MPa, and the tensile strength is greater than 1400 MPa. The elongation after breaking is greater than 10%, and the impact energy at -40°C is greater than 27J.

Periodic soaking test: The periodical soaking test was carried out for 72 hours in an acidic environment with (1.0±0.05)×10 ^-2 mol/L NaHSO ₃ and pH 4～5. The results are shown in Table 4:

Table 4

Numbering Weight loss per hour (g m^-2 h) Relative corrosion rate Example 1 1.949 41.44% Example 2 1.904 40.48% Comparative ratio 4.703 100%

It can be seen from Table 4 that, compared with the comparative example, the relative corrosion rates of Examples 1 to 2 are less than 50%, their weather resistance is greatly improved, and their relative corrosion rates are less than 50% of the same level of martensitic wear-resistant steel Hardox450. While ensuring the hardness, plasticity and toughness of the steel plate, Examples 1-2 significantly improve its atmospheric corrosion resistance, and its service life is more than twice that of Hardox450.

The above descriptions are only preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements and improvements made within the spirit and principles of the present invention shall be included in the protection of the present invention. within the range.

Claims (10)

1. An atmospheric corrosion-resistant martensitic wear-resistant steel plate, characterized in that, the atmospheric corrosion-resistant martensitic wear-resistant steel plate comprises in mass percentage: 0.14wt%≤C≤0.22wt%; 0.30wt% ≤Si≤0.60wt%; 0.30wt%≤Mn≤1.00wt%; 0.010wt%≤Ti≤0.020wt%; 0.02wt%≤Nb≤0.04wt%; 0.50wt%≤Ni≤1.0wt%; 0.20wt% ≤Cu≤0.50wt%; 3.4wt%≤Cr≤4.0wt%; 0.0010wt%≤B≤0.0020wt%; 0<S≤0.003wt%; 0<P≤0.012wt%; the rest are iron and other inevitable The atmospheric corrosion resistance index I of the atmospheric corrosion-resistant martensitic wear-resistant steel plate is 10-15; wherein the calculation formula of the atmospheric corrosion resistance index is: I=26.01(%Cu)+3.88(%Ni)+1.20(%Cr)+1.49(%Si)+17.28(%P)-7.29(%Cu)(%Ni)-9.10(%Ni)(%P )-33.39(%Cu) ² Wherein, the element symbol in parentheses is the mass percentage of the corresponding element, and the % element symbol represents the mass percentage of the corresponding element multiplied by 100. 2 . The atmospheric corrosion-resistant martensitic wear-resistant steel plate according to claim 1 , wherein the atmospheric corrosion-resistant martensitic wear-resistant steel plate comprises in weight percentage: 0.14wt%≤C≤0.18wt %; 0.30wt%≤Si≤0.50wt%; 0.30wt%≤Mn≤0.60wt%; 0.012wt%≤Ti≤0.018wt%; 0.02wt%≤Nb≤0.03wt%; 0.50wt%≤Ni≤0.8wt% %; 0.25wt%≤Cu≤0.45wt%; 3.5wt%≤Cr≤3.8wt%; 0.0015wt%≤B≤0.0020wt%; 0<S≤0.003wt%; 0<P≤0.012wt%; the rest are Iron and other inevitable impurities. 3. The atmospheric corrosion-resistant martensitic wear-resistant steel plate according to claim 1, wherein the atmospheric corrosion-resistant martensitic wear-resistant steel plate comprises, in mass percentage, C: 0.15wt%; Si: 0.40wt%; Mn: 0.45wt%; Ti: 0.014wt%; Nb: 0.02wt%; Ni: 0.65wt%; Cu: 0.38wt%; Cr: 3.5wt%; B: 0.0018wt%; S: 0.001wt% %; P: 0.005wt%; the rest is iron and other inevitable impurities. 4 . The atmospheric corrosion-resistant martensitic wear-resistant steel plate according to claim 1 , wherein the atmospheric corrosion-resistant martensitic wear-resistant steel plate has an atmospheric corrosion resistance index I of 12-15. 5 . 5. The atmospheric corrosion-resistant martensitic wear-resistant steel plate according to any one of claims 1 to 4, wherein the atmospheric corrosion-resistant martensitic wear-resistant steel plate has a yield strength of 1100 MPa to 1300 MPa, and is resistant to The tensile strength is 1300MPa～1500MPa, the steel plate hardness is HBW420～480, the elongation is 8%～15%, and the impact energy at -40℃ is 27J～70J. 6 . A method for producing a martensitic wear-resistant steel sheet with resistance to atmospheric corrosion as claimed in claim 1 , comprising the following steps: smelting molten steel into slabs, and forming hot-rolled slabs to form slabs. 7 . Steel coil, the steel coil is opened and leveled, quenched and tempered in turn to obtain a martensitic wear-resistant steel plate that is resistant to atmospheric corrosion. 7. The atmospheric corrosion-resistant martensitic wear-resistant steel plate according to claim 6, wherein the smelting molten steel into slab comprises: after the molten steel is subjected to KR method desulfurization, converter steelmaking, and RH method refining treatment in sequence , continuous casting into slabs, wherein the continuous casting steps include: the continuous casting pulling speed is 0.8-1.3 m/min, the heating temperature is 1200-1300 DEG C, and the holding time is 20-30 min. 8 . The atmospheric corrosion-resistant martensitic wear-resistant steel plate according to claim 6 , wherein the forming of the hot-rolled slab into a coil comprises: the slab is sequentially reheated, rough rolling, finishing rolling, After laminar cooling, coiling to form a steel coil, wherein the reheating step includes reheating the slab at a heating temperature of 1200-1300° C. and a holding time of 20-30 minutes; and/or The step of rough rolling includes: the total reduction ratio of rough rolling is 75% to 85%, the single pass reduction ratio of rough rolling is 15% to 25%; the surface temperature of the slab after rough rolling is 1050 ℃～ 1100°C; and/or The step of finishing rolling includes: the total reduction rate of finishing rolling is 60%-80%, the single-pass reduction rate of finishing rolling is 12%-20%; the finishing rolling temperature of finishing rolling is 840-890°C ;and / or The step of laminar cooling includes that the cooling rate of laminar cooling is 10°C/s˜25°C/s; and/or The coiling step includes that the coiling temperature is 560-650°C. 9 . The method for manufacturing a martensitic wear-resistant steel sheet with high wear resistance according to claim 6 , wherein the step of quenching comprises that the quenching heating temperature is 850° C. to 900° C., and the quenching and holding time is 20 min. 10 . ~60min. 10 . The method for manufacturing a martensitic wear-resistant steel plate with high wear resistance according to claim 6 , wherein the step of tempering comprises: the tempering temperature is 150° C. to 200° C., and the tempering holding time is 150° C. 10 . 30 to 60 minutes.

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